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mm-only debug patch...
[mmotm.git] / sound / core / seq / seq_clientmgr.c
blob8ca2be339f3bacb230c584472f5a371f6098073b
1 /*
2 * ALSA sequencer Client Manager
3 * Copyright (c) 1998-2001 by Frank van de Pol <fvdpol@coil.demon.nl>
4 * Jaroslav Kysela <perex@perex.cz>
5 * Takashi Iwai <tiwai@suse.de>
6 *
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22 */
23
24 #include <linux/init.h>
25 #include <linux/slab.h>
26 #include <sound/core.h>
27 #include <sound/minors.h>
28 #include <linux/kmod.h>
29
30 #include <sound/seq_kernel.h>
31 #include "seq_clientmgr.h"
32 #include "seq_memory.h"
33 #include "seq_queue.h"
34 #include "seq_timer.h"
35 #include "seq_info.h"
36 #include "seq_system.h"
37 #include <sound/seq_device.h>
38 #ifdef CONFIG_COMPAT
39 #include <linux/compat.h>
40 #endif
41
42 /* Client Manager
43
44 * this module handles the connections of userland and kernel clients
45 *
46 */
47
48 /*
49 * There are four ranges of client numbers (last two shared):
50 * 0..15: global clients
51 * 16..127: statically allocated client numbers for cards 0..27
52 * 128..191: dynamically allocated client numbers for cards 28..31
53 * 128..191: dynamically allocated client numbers for applications
54 */
55
56 /* number of kernel non-card clients */
57 #define SNDRV_SEQ_GLOBAL_CLIENTS 16
58 /* clients per cards, for static clients */
59 #define SNDRV_SEQ_CLIENTS_PER_CARD 4
60 /* dynamically allocated client numbers (both kernel drivers and user space) */
61 #define SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN 128
62
63 #define SNDRV_SEQ_LFLG_INPUT 0x0001
64 #define SNDRV_SEQ_LFLG_OUTPUT 0x0002
65 #define SNDRV_SEQ_LFLG_OPEN (SNDRV_SEQ_LFLG_INPUT|SNDRV_SEQ_LFLG_OUTPUT)
66
67 static DEFINE_SPINLOCK(clients_lock);
68 static DEFINE_MUTEX(register_mutex);
69
70 /*
71 * client table
72 */
73 static char clienttablock[SNDRV_SEQ_MAX_CLIENTS];
74 static struct snd_seq_client *clienttab[SNDRV_SEQ_MAX_CLIENTS];
75 static struct snd_seq_usage client_usage;
76
77 /*
78 * prototypes
79 */
80 static int bounce_error_event(struct snd_seq_client *client,
81 struct snd_seq_event *event,
82 int err, int atomic, int hop);
83 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
84 struct snd_seq_event *event,
85 int filter, int atomic, int hop);
86
87 /*
88 */
89
90 static inline mm_segment_t snd_enter_user(void)
91 {
92 mm_segment_t fs = get_fs();
93 set_fs(get_ds());
94 return fs;
95 }
96
97 static inline void snd_leave_user(mm_segment_t fs)
98 {
99 set_fs(fs);
100 }
101
102 /*
103 */
104 static inline unsigned short snd_seq_file_flags(struct file *file)
105 {
106 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
107 case FMODE_WRITE:
108 return SNDRV_SEQ_LFLG_OUTPUT;
109 case FMODE_READ:
110 return SNDRV_SEQ_LFLG_INPUT;
111 default:
112 return SNDRV_SEQ_LFLG_OPEN;
113 }
114 }
115
116 static inline int snd_seq_write_pool_allocated(struct snd_seq_client *client)
117 {
118 return snd_seq_total_cells(client->pool) > 0;
119 }
120
121 /* return pointer to client structure for specified id */
122 static struct snd_seq_client *clientptr(int clientid)
123 {
124 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
125 snd_printd("Seq: oops. Trying to get pointer to client %d\n",
126 clientid);
127 return NULL;
128 }
129 return clienttab[clientid];
130 }
131
132 struct snd_seq_client *snd_seq_client_use_ptr(int clientid)
133 {
134 unsigned long flags;
135 struct snd_seq_client *client;
136
137 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
138 snd_printd("Seq: oops. Trying to get pointer to client %d\n",
139 clientid);
140 return NULL;
141 }
142 spin_lock_irqsave(&clients_lock, flags);
143 client = clientptr(clientid);
144 if (client)
145 goto __lock;
146 if (clienttablock[clientid]) {
147 spin_unlock_irqrestore(&clients_lock, flags);
148 return NULL;
149 }
150 spin_unlock_irqrestore(&clients_lock, flags);
151 #ifdef CONFIG_MODULES
152 if (!in_interrupt()) {
153 static char client_requested[SNDRV_SEQ_GLOBAL_CLIENTS];
154 static char card_requested[SNDRV_CARDS];
155 if (clientid < SNDRV_SEQ_GLOBAL_CLIENTS) {
156 int idx;
157
158 if (!client_requested[clientid]) {
159 client_requested[clientid] = 1;
160 for (idx = 0; idx < 15; idx++) {
161 if (seq_client_load[idx] < 0)
162 break;
163 if (seq_client_load[idx] == clientid) {
164 request_module("snd-seq-client-%i",
165 clientid);
166 break;
167 }
168 }
169 }
170 } else if (clientid < SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) {
171 int card = (clientid - SNDRV_SEQ_GLOBAL_CLIENTS) /
172 SNDRV_SEQ_CLIENTS_PER_CARD;
173 if (card < snd_ecards_limit) {
174 if (! card_requested[card]) {
175 card_requested[card] = 1;
176 snd_request_card(card);
177 }
178 snd_seq_device_load_drivers();
179 }
180 }
181 spin_lock_irqsave(&clients_lock, flags);
182 client = clientptr(clientid);
183 if (client)
184 goto __lock;
185 spin_unlock_irqrestore(&clients_lock, flags);
186 }
187 #endif
188 return NULL;
189
190 __lock:
191 snd_use_lock_use(&client->use_lock);
192 spin_unlock_irqrestore(&clients_lock, flags);
193 return client;
194 }
195
196 static void usage_alloc(struct snd_seq_usage *res, int num)
197 {
198 res->cur += num;
199 if (res->cur > res->peak)
200 res->peak = res->cur;
201 }
202
203 static void usage_free(struct snd_seq_usage *res, int num)
204 {
205 res->cur -= num;
206 }
207
208 /* initialise data structures */
209 int __init client_init_data(void)
210 {
211 /* zap out the client table */
212 memset(&clienttablock, 0, sizeof(clienttablock));
213 memset(&clienttab, 0, sizeof(clienttab));
214 return 0;
215 }
216
217
218 static struct snd_seq_client *seq_create_client1(int client_index, int poolsize)
219 {
220 unsigned long flags;
221 int c;
222 struct snd_seq_client *client;
223
224 /* init client data */
225 client = kzalloc(sizeof(*client), GFP_KERNEL);
226 if (client == NULL)
227 return NULL;
228 client->pool = snd_seq_pool_new(poolsize);
229 if (client->pool == NULL) {
230 kfree(client);
231 return NULL;
232 }
233 client->type = NO_CLIENT;
234 snd_use_lock_init(&client->use_lock);
235 rwlock_init(&client->ports_lock);
236 mutex_init(&client->ports_mutex);
237 INIT_LIST_HEAD(&client->ports_list_head);
238
239 /* find free slot in the client table */
240 spin_lock_irqsave(&clients_lock, flags);
241 if (client_index < 0) {
242 for (c = SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN;
243 c < SNDRV_SEQ_MAX_CLIENTS;
244 c++) {
245 if (clienttab[c] || clienttablock[c])
246 continue;
247 clienttab[client->number = c] = client;
248 spin_unlock_irqrestore(&clients_lock, flags);
249 return client;
250 }
251 } else {
252 if (clienttab[client_index] == NULL && !clienttablock[client_index]) {
253 clienttab[client->number = client_index] = client;
254 spin_unlock_irqrestore(&clients_lock, flags);
255 return client;
256 }
257 }
258 spin_unlock_irqrestore(&clients_lock, flags);
259 snd_seq_pool_delete(&client->pool);
260 kfree(client);
261 return NULL; /* no free slot found or busy, return failure code */
262 }
263
264
265 static int seq_free_client1(struct snd_seq_client *client)
266 {
267 unsigned long flags;
268
269 if (!client)
270 return 0;
271 snd_seq_delete_all_ports(client);
272 snd_seq_queue_client_leave(client->number);
273 spin_lock_irqsave(&clients_lock, flags);
274 clienttablock[client->number] = 1;
275 clienttab[client->number] = NULL;
276 spin_unlock_irqrestore(&clients_lock, flags);
277 snd_use_lock_sync(&client->use_lock);
278 snd_seq_queue_client_termination(client->number);
279 if (client->pool)
280 snd_seq_pool_delete(&client->pool);
281 spin_lock_irqsave(&clients_lock, flags);
282 clienttablock[client->number] = 0;
283 spin_unlock_irqrestore(&clients_lock, flags);
284 return 0;
285 }
286
287
288 static void seq_free_client(struct snd_seq_client * client)
289 {
290 mutex_lock(&register_mutex);
291 switch (client->type) {
292 case NO_CLIENT:
293 snd_printk(KERN_WARNING "Seq: Trying to free unused client %d\n",
294 client->number);
295 break;
296 case USER_CLIENT:
297 case KERNEL_CLIENT:
298 seq_free_client1(client);
299 usage_free(&client_usage, 1);
300 break;
301
302 default:
303 snd_printk(KERN_ERR "Seq: Trying to free client %d with undefined type = %d\n",
304 client->number, client->type);
305 }
306 mutex_unlock(&register_mutex);
307
308 snd_seq_system_client_ev_client_exit(client->number);
309 }
310
311
312
313 /* -------------------------------------------------------- */
314
315 /* create a user client */
316 static int snd_seq_open(struct inode *inode, struct file *file)
317 {
318 int c, mode; /* client id */
319 struct snd_seq_client *client;
320 struct snd_seq_user_client *user;
321
322 if (mutex_lock_interruptible(&register_mutex))
323 return -ERESTARTSYS;
324 client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS);
325 if (client == NULL) {
326 mutex_unlock(&register_mutex);
327 return -ENOMEM; /* failure code */
328 }
329
330 mode = snd_seq_file_flags(file);
331 if (mode & SNDRV_SEQ_LFLG_INPUT)
332 client->accept_input = 1;
333 if (mode & SNDRV_SEQ_LFLG_OUTPUT)
334 client->accept_output = 1;
335
336 user = &client->data.user;
337 user->fifo = NULL;
338 user->fifo_pool_size = 0;
339
340 if (mode & SNDRV_SEQ_LFLG_INPUT) {
341 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS;
342 user->fifo = snd_seq_fifo_new(user->fifo_pool_size);
343 if (user->fifo == NULL) {
344 seq_free_client1(client);
345 kfree(client);
346 mutex_unlock(&register_mutex);
347 return -ENOMEM;
348 }
349 }
350
351 usage_alloc(&client_usage, 1);
352 client->type = USER_CLIENT;
353 mutex_unlock(&register_mutex);
354
355 c = client->number;
356 file->private_data = client;
357
358 /* fill client data */
359 user->file = file;
360 sprintf(client->name, "Client-%d", c);
361
362 /* make others aware this new client */
363 snd_seq_system_client_ev_client_start(c);
364
365 return 0;
366 }
367
368 /* delete a user client */
369 static int snd_seq_release(struct inode *inode, struct file *file)
370 {
371 struct snd_seq_client *client = file->private_data;
372
373 if (client) {
374 seq_free_client(client);
375 if (client->data.user.fifo)
376 snd_seq_fifo_delete(&client->data.user.fifo);
377 kfree(client);
378 }
379
380 return 0;
381 }
382
383
384 /* handle client read() */
385 /* possible error values:
386 * -ENXIO invalid client or file open mode
387 * -ENOSPC FIFO overflow (the flag is cleared after this error report)
388 * -EINVAL no enough user-space buffer to write the whole event
389 * -EFAULT seg. fault during copy to user space
390 */
391 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count,
392 loff_t *offset)
393 {
394 struct snd_seq_client *client = file->private_data;
395 struct snd_seq_fifo *fifo;
396 int err;
397 long result = 0;
398 struct snd_seq_event_cell *cell;
399
400 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT))
401 return -ENXIO;
402
403 if (!access_ok(VERIFY_WRITE, buf, count))
404 return -EFAULT;
405
406 /* check client structures are in place */
407 if (snd_BUG_ON(!client))
408 return -ENXIO;
409
410 if (!client->accept_input || (fifo = client->data.user.fifo) == NULL)
411 return -ENXIO;
412
413 if (atomic_read(&fifo->overflow) > 0) {
414 /* buffer overflow is detected */
415 snd_seq_fifo_clear(fifo);
416 /* return error code */
417 return -ENOSPC;
418 }
419
420 cell = NULL;
421 err = 0;
422 snd_seq_fifo_lock(fifo);
423
424 /* while data available in queue */
425 while (count >= sizeof(struct snd_seq_event)) {
426 int nonblock;
427
428 nonblock = (file->f_flags & O_NONBLOCK) || result > 0;
429 if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) {
430 break;
431 }
432 if (snd_seq_ev_is_variable(&cell->event)) {
433 struct snd_seq_event tmpev;
434 tmpev = cell->event;
435 tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
436 if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) {
437 err = -EFAULT;
438 break;
439 }
440 count -= sizeof(struct snd_seq_event);
441 buf += sizeof(struct snd_seq_event);
442 err = snd_seq_expand_var_event(&cell->event, count,
443 (char __force *)buf, 0,
444 sizeof(struct snd_seq_event));
445 if (err < 0)
446 break;
447 result += err;
448 count -= err;
449 buf += err;
450 } else {
451 if (copy_to_user(buf, &cell->event, sizeof(struct snd_seq_event))) {
452 err = -EFAULT;
453 break;
454 }
455 count -= sizeof(struct snd_seq_event);
456 buf += sizeof(struct snd_seq_event);
457 }
458 snd_seq_cell_free(cell);
459 cell = NULL; /* to be sure */
460 result += sizeof(struct snd_seq_event);
461 }
462
463 if (err < 0) {
464 if (cell)
465 snd_seq_fifo_cell_putback(fifo, cell);
466 if (err == -EAGAIN && result > 0)
467 err = 0;
468 }
469 snd_seq_fifo_unlock(fifo);
470
471 return (err < 0) ? err : result;
472 }
473
474
475 /*
476 * check access permission to the port
477 */
478 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags)
479 {
480 if ((port->capability & flags) != flags)
481 return 0;
482 return flags;
483 }
484
485 /*
486 * check if the destination client is available, and return the pointer
487 * if filter is non-zero, client filter bitmap is tested.
488 */
489 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event,
490 int filter)
491 {
492 struct snd_seq_client *dest;
493
494 dest = snd_seq_client_use_ptr(event->dest.client);
495 if (dest == NULL)
496 return NULL;
497 if (! dest->accept_input)
498 goto __not_avail;
499 if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) &&
500 ! test_bit(event->type, dest->event_filter))
501 goto __not_avail;
502 if (filter && !(dest->filter & filter))
503 goto __not_avail;
504
505 return dest; /* ok - accessible */
506 __not_avail:
507 snd_seq_client_unlock(dest);
508 return NULL;
509 }
510
511
512 /*
513 * Return the error event.
514 *
515 * If the receiver client is a user client, the original event is
516 * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event. If
517 * the original event is also variable length, the external data is
518 * copied after the event record.
519 * If the receiver client is a kernel client, the original event is
520 * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra
521 * kmalloc.
522 */
523 static int bounce_error_event(struct snd_seq_client *client,
524 struct snd_seq_event *event,
525 int err, int atomic, int hop)
526 {
527 struct snd_seq_event bounce_ev;
528 int result;
529
530 if (client == NULL ||
531 ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) ||
532 ! client->accept_input)
533 return 0; /* ignored */
534
535 /* set up quoted error */
536 memset(&bounce_ev, 0, sizeof(bounce_ev));
537 bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR;
538 bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED;
539 bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT;
540 bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
541 bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
542 bounce_ev.dest.client = client->number;
543 bounce_ev.dest.port = event->source.port;
544 bounce_ev.data.quote.origin = event->dest;
545 bounce_ev.data.quote.event = event;
546 bounce_ev.data.quote.value = -err; /* use positive value */
547 result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1);
548 if (result < 0) {
549 client->event_lost++;
550 return result;
551 }
552
553 return result;
554 }
555
556
557 /*
558 * rewrite the time-stamp of the event record with the curren time
559 * of the given queue.
560 * return non-zero if updated.
561 */
562 static int update_timestamp_of_queue(struct snd_seq_event *event,
563 int queue, int real_time)
564 {
565 struct snd_seq_queue *q;
566
567 q = queueptr(queue);
568 if (! q)
569 return 0;
570 event->queue = queue;
571 event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK;
572 if (real_time) {
573 event->time.time = snd_seq_timer_get_cur_time(q->timer);
574 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL;
575 } else {
576 event->time.tick = snd_seq_timer_get_cur_tick(q->timer);
577 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK;
578 }
579 queuefree(q);
580 return 1;
581 }
582
583
584 /*
585 * deliver an event to the specified destination.
586 * if filter is non-zero, client filter bitmap is tested.
587 *
588 * RETURN VALUE: 0 : if succeeded
589 * <0 : error
590 */
591 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
592 struct snd_seq_event *event,
593 int filter, int atomic, int hop)
594 {
595 struct snd_seq_client *dest = NULL;
596 struct snd_seq_client_port *dest_port = NULL;
597 int result = -ENOENT;
598 int direct;
599
600 direct = snd_seq_ev_is_direct(event);
601
602 dest = get_event_dest_client(event, filter);
603 if (dest == NULL)
604 goto __skip;
605 dest_port = snd_seq_port_use_ptr(dest, event->dest.port);
606 if (dest_port == NULL)
607 goto __skip;
608
609 /* check permission */
610 if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) {
611 result = -EPERM;
612 goto __skip;
613 }
614
615 if (dest_port->timestamping)
616 update_timestamp_of_queue(event, dest_port->time_queue,
617 dest_port->time_real);
618
619 switch (dest->type) {
620 case USER_CLIENT:
621 if (dest->data.user.fifo)
622 result = snd_seq_fifo_event_in(dest->data.user.fifo, event);
623 break;
624
625 case KERNEL_CLIENT:
626 if (dest_port->event_input == NULL)
627 break;
628 result = dest_port->event_input(event, direct,
629 dest_port->private_data,
630 atomic, hop);
631 break;
632 default:
633 break;
634 }
635
636 __skip:
637 if (dest_port)
638 snd_seq_port_unlock(dest_port);
639 if (dest)
640 snd_seq_client_unlock(dest);
641
642 if (result < 0 && !direct) {
643 result = bounce_error_event(client, event, result, atomic, hop);
644 }
645 return result;
646 }
647
648
649 /*
650 * send the event to all subscribers:
651 */
652 static int deliver_to_subscribers(struct snd_seq_client *client,
653 struct snd_seq_event *event,
654 int atomic, int hop)
655 {
656 struct snd_seq_subscribers *subs;
657 int err = 0, num_ev = 0;
658 struct snd_seq_event event_saved;
659 struct snd_seq_client_port *src_port;
660 struct snd_seq_port_subs_info *grp;
661
662 src_port = snd_seq_port_use_ptr(client, event->source.port);
663 if (src_port == NULL)
664 return -EINVAL; /* invalid source port */
665 /* save original event record */
666 event_saved = *event;
667 grp = &src_port->c_src;
668
669 /* lock list */
670 if (atomic)
671 read_lock(&grp->list_lock);
672 else
673 down_read(&grp->list_mutex);
674 list_for_each_entry(subs, &grp->list_head, src_list) {
675 event->dest = subs->info.dest;
676 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
677 /* convert time according to flag with subscription */
678 update_timestamp_of_queue(event, subs->info.queue,
679 subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL);
680 err = snd_seq_deliver_single_event(client, event,
681 0, atomic, hop);
682 if (err < 0)
683 break;
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 (err < 0) ? err : 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 = 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 break;
723 num_ev++;
724 }
725 read_unlock(&dest_client->ports_lock);
726 snd_seq_client_unlock(dest_client);
727 event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */
728 return (err < 0) ? err : num_ev;
729 }
730
731 /*
732 * send the event to all clients:
733 * if destination port is also ADDRESS_BROADCAST, deliver to all ports.
734 */
735 static int broadcast_event(struct snd_seq_client *client,
736 struct snd_seq_event *event, int atomic, int hop)
737 {
738 int err = 0, num_ev = 0;
739 int dest;
740 struct snd_seq_addr addr;
741
742 addr = event->dest; /* save */
743
744 for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) {
745 /* don't send to itself */
746 if (dest == client->number)
747 continue;
748 event->dest.client = dest;
749 event->dest.port = addr.port;
750 if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST)
751 err = port_broadcast_event(client, event, atomic, hop);
752 else
753 /* pass NULL as source client to avoid error bounce */
754 err = snd_seq_deliver_single_event(NULL, event,
755 SNDRV_SEQ_FILTER_BROADCAST,
756 atomic, hop);
757 if (err < 0)
758 break;
759 num_ev += err;
760 }
761 event->dest = addr; /* restore */
762 return (err < 0) ? err : num_ev;
763 }
764
765
766 /* multicast - not supported yet */
767 static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event,
768 int atomic, int hop)
769 {
770 snd_printd("seq: multicast not supported yet.\n");
771 return 0; /* ignored */
772 }
773 #endif /* SUPPORT_BROADCAST */
774
775
776 /* deliver an event to the destination port(s).
777 * if the event is to subscribers or broadcast, the event is dispatched
778 * to multiple targets.
779 *
780 * RETURN VALUE: n > 0 : the number of delivered events.
781 * n == 0 : the event was not passed to any client.
782 * n < 0 : error - event was not processed.
783 */
784 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event,
785 int atomic, int hop)
786 {
787 int result;
788
789 hop++;
790 if (hop >= SNDRV_SEQ_MAX_HOPS) {
791 snd_printd("too long delivery path (%d:%d->%d:%d)\n",
792 event->source.client, event->source.port,
793 event->dest.client, event->dest.port);
794 return -EMLINK;
795 }
796
797 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS ||
798 event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS)
799 result = deliver_to_subscribers(client, event, atomic, hop);
800 #ifdef SUPPORT_BROADCAST
801 else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST ||
802 event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST)
803 result = broadcast_event(client, event, atomic, hop);
804 else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS)
805 result = multicast_event(client, event, atomic, hop);
806 else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST)
807 result = port_broadcast_event(client, event, atomic, hop);
808 #endif
809 else
810 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop);
811
812 return result;
813 }
814
815 /*
816 * dispatch an event cell:
817 * This function is called only from queue check routines in timer
818 * interrupts or after enqueued.
819 * The event cell shall be released or re-queued in this function.
820 *
821 * RETURN VALUE: n > 0 : the number of delivered events.
822 * n == 0 : the event was not passed to any client.
823 * n < 0 : error - event was not processed.
824 */
825 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop)
826 {
827 struct snd_seq_client *client;
828 int result;
829
830 if (snd_BUG_ON(!cell))
831 return -EINVAL;
832
833 client = snd_seq_client_use_ptr(cell->event.source.client);
834 if (client == NULL) {
835 snd_seq_cell_free(cell); /* release this cell */
836 return -EINVAL;
837 }
838
839 if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) {
840 /* NOTE event:
841 * the event cell is re-used as a NOTE-OFF event and
842 * enqueued again.
843 */
844 struct snd_seq_event tmpev, *ev;
845
846 /* reserve this event to enqueue note-off later */
847 tmpev = cell->event;
848 tmpev.type = SNDRV_SEQ_EVENT_NOTEON;
849 result = snd_seq_deliver_event(client, &tmpev, atomic, hop);
850
851 /*
852 * This was originally a note event. We now re-use the
853 * cell for the note-off event.
854 */
855
856 ev = &cell->event;
857 ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
858 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH;
859
860 /* add the duration time */
861 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) {
862 case SNDRV_SEQ_TIME_STAMP_TICK:
863 ev->time.tick += ev->data.note.duration;
864 break;
865 case SNDRV_SEQ_TIME_STAMP_REAL:
866 /* unit for duration is ms */
867 ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000);
868 ev->time.time.tv_sec += ev->data.note.duration / 1000 +
869 ev->time.time.tv_nsec / 1000000000;
870 ev->time.time.tv_nsec %= 1000000000;
871 break;
872 }
873 ev->data.note.velocity = ev->data.note.off_velocity;
874
875 /* Now queue this cell as the note off event */
876 if (snd_seq_enqueue_event(cell, atomic, hop) < 0)
877 snd_seq_cell_free(cell); /* release this cell */
878
879 } else {
880 /* Normal events:
881 * event cell is freed after processing the event
882 */
883
884 result = snd_seq_deliver_event(client, &cell->event, atomic, hop);
885 snd_seq_cell_free(cell);
886 }
887
888 snd_seq_client_unlock(client);
889 return result;
890 }
891
892
893 /* Allocate a cell from client pool and enqueue it to queue:
894 * if pool is empty and blocking is TRUE, sleep until a new cell is
895 * available.
896 */
897 static int snd_seq_client_enqueue_event(struct snd_seq_client *client,
898 struct snd_seq_event *event,
899 struct file *file, int blocking,
900 int atomic, int hop)
901 {
902 struct snd_seq_event_cell *cell;
903 int err;
904
905 /* special queue values - force direct passing */
906 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
907 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
908 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
909 } else
910 #ifdef SUPPORT_BROADCAST
911 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) {
912 event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST;
913 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
914 }
915 #endif
916 if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
917 /* check presence of source port */
918 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port);
919 if (src_port == NULL)
920 return -EINVAL;
921 snd_seq_port_unlock(src_port);
922 }
923
924 /* direct event processing without enqueued */
925 if (snd_seq_ev_is_direct(event)) {
926 if (event->type == SNDRV_SEQ_EVENT_NOTE)
927 return -EINVAL; /* this event must be enqueued! */
928 return snd_seq_deliver_event(client, event, atomic, hop);
929 }
930
931 /* Not direct, normal queuing */
932 if (snd_seq_queue_is_used(event->queue, client->number) <= 0)
933 return -EINVAL; /* invalid queue */
934 if (! snd_seq_write_pool_allocated(client))
935 return -ENXIO; /* queue is not allocated */
936
937 /* allocate an event cell */
938 err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, file);
939 if (err < 0)
940 return err;
941
942 /* we got a cell. enqueue it. */
943 if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
944 snd_seq_cell_free(cell);
945 return err;
946 }
947
948 return 0;
949 }
950
951
952 /*
953 * check validity of event type and data length.
954 * return non-zero if invalid.
955 */
956 static int check_event_type_and_length(struct snd_seq_event *ev)
957 {
958 switch (snd_seq_ev_length_type(ev)) {
959 case SNDRV_SEQ_EVENT_LENGTH_FIXED:
960 if (snd_seq_ev_is_variable_type(ev))
961 return -EINVAL;
962 break;
963 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
964 if (! snd_seq_ev_is_variable_type(ev) ||
965 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
966 return -EINVAL;
967 break;
968 case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
969 if (! snd_seq_ev_is_direct(ev))
970 return -EINVAL;
971 break;
972 }
973 return 0;
974 }
975
976
977 /* handle write() */
978 /* possible error values:
979 * -ENXIO invalid client or file open mode
980 * -ENOMEM malloc failed
981 * -EFAULT seg. fault during copy from user space
982 * -EINVAL invalid event
983 * -EAGAIN no space in output pool
984 * -EINTR interrupts while sleep
985 * -EMLINK too many hops
986 * others depends on return value from driver callback
987 */
988 static ssize_t snd_seq_write(struct file *file, const char __user *buf,
989 size_t count, loff_t *offset)
990 {
991 struct snd_seq_client *client = file->private_data;
992 int written = 0, len;
993 int err = -EINVAL;
994 struct snd_seq_event event;
995
996 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
997 return -ENXIO;
998
999 /* check client structures are in place */
1000 if (snd_BUG_ON(!client))
1001 return -ENXIO;
1002
1003 if (!client->accept_output || client->pool == NULL)
1004 return -ENXIO;
1005
1006 /* allocate the pool now if the pool is not allocated yet */
1007 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
1008 if (snd_seq_pool_init(client->pool) < 0)
1009 return -ENOMEM;
1010 }
1011
1012 /* only process whole events */
1013 while (count >= sizeof(struct snd_seq_event)) {
1014 /* Read in the event header from the user */
1015 len = sizeof(event);
1016 if (copy_from_user(&event, buf, len)) {
1017 err = -EFAULT;
1018 break;
1019 }
1020 event.source.client = client->number; /* fill in client number */
1021 /* Check for extension data length */
1022 if (check_event_type_and_length(&event)) {
1023 err = -EINVAL;
1024 break;
1025 }
1026
1027 /* check for special events */
1028 if (event.type == SNDRV_SEQ_EVENT_NONE)
1029 goto __skip_event;
1030 else if (snd_seq_ev_is_reserved(&event)) {
1031 err = -EINVAL;
1032 break;
1033 }
1034
1035 if (snd_seq_ev_is_variable(&event)) {
1036 int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK;
1037 if ((size_t)(extlen + len) > count) {
1038 /* back out, will get an error this time or next */
1039 err = -EINVAL;
1040 break;
1041 }
1042 /* set user space pointer */
1043 event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
1044 event.data.ext.ptr = (char __force *)buf
1045 + sizeof(struct snd_seq_event);
1046 len += extlen; /* increment data length */
1047 } else {
1048 #ifdef CONFIG_COMPAT
1049 if (client->convert32 && snd_seq_ev_is_varusr(&event)) {
1050 void *ptr = compat_ptr(event.data.raw32.d[1]);
1051 event.data.ext.ptr = ptr;
1052 }
1053 #endif
1054 }
1055
1056 /* ok, enqueue it */
1057 err = snd_seq_client_enqueue_event(client, &event, file,
1058 !(file->f_flags & O_NONBLOCK),
1059 0, 0);
1060 if (err < 0)
1061 break;
1062
1063 __skip_event:
1064 /* Update pointers and counts */
1065 count -= len;
1066 buf += len;
1067 written += len;
1068 }
1069
1070 return written ? written : err;
1071 }
1072
1073
1074 /*
1075 * handle polling
1076 */
1077 static unsigned int snd_seq_poll(struct file *file, poll_table * wait)
1078 {
1079 struct snd_seq_client *client = file->private_data;
1080 unsigned int mask = 0;
1081
1082 /* check client structures are in place */
1083 if (snd_BUG_ON(!client))
1084 return -ENXIO;
1085
1086 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1087 client->data.user.fifo) {
1088
1089 /* check if data is available in the outqueue */
1090 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
1091 mask |= POLLIN | POLLRDNORM;
1092 }
1093
1094 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1095
1096 /* check if data is available in the pool */
1097 if (!snd_seq_write_pool_allocated(client) ||
1098 snd_seq_pool_poll_wait(client->pool, file, wait))
1099 mask |= POLLOUT | POLLWRNORM;
1100 }
1101
1102 return mask;
1103 }
1104
1105
1106 /*-----------------------------------------------------*/
1107
1108
1109 /* SYSTEM_INFO ioctl() */
1110 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void __user *arg)
1111 {
1112 struct snd_seq_system_info info;
1113
1114 memset(&info, 0, sizeof(info));
1115 /* fill the info fields */
1116 info.queues = SNDRV_SEQ_MAX_QUEUES;
1117 info.clients = SNDRV_SEQ_MAX_CLIENTS;
1118 info.ports = 256; /* fixed limit */
1119 info.channels = 256; /* fixed limit */
1120 info.cur_clients = client_usage.cur;
1121 info.cur_queues = snd_seq_queue_get_cur_queues();
1122
1123 if (copy_to_user(arg, &info, sizeof(info)))
1124 return -EFAULT;
1125 return 0;
1126 }
1127
1128
1129 /* RUNNING_MODE ioctl() */
1130 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void __user *arg)
1131 {
1132 struct snd_seq_running_info info;
1133 struct snd_seq_client *cptr;
1134 int err = 0;
1135
1136 if (copy_from_user(&info, arg, sizeof(info)))
1137 return -EFAULT;
1138
1139 /* requested client number */
1140 cptr = snd_seq_client_use_ptr(info.client);
1141 if (cptr == NULL)
1142 return -ENOENT; /* don't change !!! */
1143
1144 #ifdef SNDRV_BIG_ENDIAN
1145 if (! info.big_endian) {
1146 err = -EINVAL;
1147 goto __err;
1148 }
1149 #else
1150 if (info.big_endian) {
1151 err = -EINVAL;
1152 goto __err;
1153 }
1154
1155 #endif
1156 if (info.cpu_mode > sizeof(long)) {
1157 err = -EINVAL;
1158 goto __err;
1159 }
1160 cptr->convert32 = (info.cpu_mode < sizeof(long));
1161 __err:
1162 snd_seq_client_unlock(cptr);
1163 return err;
1164 }
1165
1166 /* CLIENT_INFO ioctl() */
1167 static void get_client_info(struct snd_seq_client *cptr,
1168 struct snd_seq_client_info *info)
1169 {
1170 info->client = cptr->number;
1171
1172 /* fill the info fields */
1173 info->type = cptr->type;
1174 strcpy(info->name, cptr->name);
1175 info->filter = cptr->filter;
1176 info->event_lost = cptr->event_lost;
1177 memcpy(info->event_filter, cptr->event_filter, 32);
1178 info->num_ports = cptr->num_ports;
1179 memset(info->reserved, 0, sizeof(info->reserved));
1180 }
1181
1182 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
1183 void __user *arg)
1184 {
1185 struct snd_seq_client *cptr;
1186 struct snd_seq_client_info client_info;
1187
1188 if (copy_from_user(&client_info, arg, sizeof(client_info)))
1189 return -EFAULT;
1190
1191 /* requested client number */
1192 cptr = snd_seq_client_use_ptr(client_info.client);
1193 if (cptr == NULL)
1194 return -ENOENT; /* don't change !!! */
1195
1196 get_client_info(cptr, &client_info);
1197 snd_seq_client_unlock(cptr);
1198
1199 if (copy_to_user(arg, &client_info, sizeof(client_info)))
1200 return -EFAULT;
1201 return 0;
1202 }
1203
1204
1205 /* CLIENT_INFO ioctl() */
1206 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
1207 void __user *arg)
1208 {
1209 struct snd_seq_client_info client_info;
1210
1211 if (copy_from_user(&client_info, arg, sizeof(client_info)))
1212 return -EFAULT;
1213
1214 /* it is not allowed to set the info fields for an another client */
1215 if (client->number != client_info.client)
1216 return -EPERM;
1217 /* also client type must be set now */
1218 if (client->type != client_info.type)
1219 return -EINVAL;
1220
1221 /* fill the info fields */
1222 if (client_info.name[0])
1223 strlcpy(client->name, client_info.name, sizeof(client->name));
1224
1225 client->filter = client_info.filter;
1226 client->event_lost = client_info.event_lost;
1227 memcpy(client->event_filter, client_info.event_filter, 32);
1228
1229 return 0;
1230 }
1231
1232
1233 /*
1234 * CREATE PORT ioctl()
1235 */
1236 static int snd_seq_ioctl_create_port(struct snd_seq_client *client,
1237 void __user *arg)
1238 {
1239 struct snd_seq_client_port *port;
1240 struct snd_seq_port_info info;
1241 struct snd_seq_port_callback *callback;
1242
1243 if (copy_from_user(&info, arg, sizeof(info)))
1244 return -EFAULT;
1245
1246 /* it is not allowed to create the port for an another client */
1247 if (info.addr.client != client->number)
1248 return -EPERM;
1249
1250 port = snd_seq_create_port(client, (info.flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info.addr.port : -1);
1251 if (port == NULL)
1252 return -ENOMEM;
1253
1254 if (client->type == USER_CLIENT && info.kernel) {
1255 snd_seq_delete_port(client, port->addr.port);
1256 return -EINVAL;
1257 }
1258 if (client->type == KERNEL_CLIENT) {
1259 if ((callback = info.kernel) != NULL) {
1260 if (callback->owner)
1261 port->owner = callback->owner;
1262 port->private_data = callback->private_data;
1263 port->private_free = callback->private_free;
1264 port->callback_all = callback->callback_all;
1265 port->event_input = callback->event_input;
1266 port->c_src.open = callback->subscribe;
1267 port->c_src.close = callback->unsubscribe;
1268 port->c_dest.open = callback->use;
1269 port->c_dest.close = callback->unuse;
1270 }
1271 }
1272
1273 info.addr = port->addr;
1274
1275 snd_seq_set_port_info(port, &info);
1276 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1277
1278 if (copy_to_user(arg, &info, sizeof(info)))
1279 return -EFAULT;
1280
1281 return 0;
1282 }
1283
1284 /*
1285 * DELETE PORT ioctl()
1286 */
1287 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client,
1288 void __user *arg)
1289 {
1290 struct snd_seq_port_info info;
1291 int err;
1292
1293 /* set passed parameters */
1294 if (copy_from_user(&info, arg, sizeof(info)))
1295 return -EFAULT;
1296
1297 /* it is not allowed to remove the port for an another client */
1298 if (info.addr.client != client->number)
1299 return -EPERM;
1300
1301 err = snd_seq_delete_port(client, info.addr.port);
1302 if (err >= 0)
1303 snd_seq_system_client_ev_port_exit(client->number, info.addr.port);
1304 return err;
1305 }
1306
1307
1308 /*
1309 * GET_PORT_INFO ioctl() (on any client)
1310 */
1311 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client,
1312 void __user *arg)
1313 {
1314 struct snd_seq_client *cptr;
1315 struct snd_seq_client_port *port;
1316 struct snd_seq_port_info info;
1317
1318 if (copy_from_user(&info, arg, sizeof(info)))
1319 return -EFAULT;
1320 cptr = snd_seq_client_use_ptr(info.addr.client);
1321 if (cptr == NULL)
1322 return -ENXIO;
1323
1324 port = snd_seq_port_use_ptr(cptr, info.addr.port);
1325 if (port == NULL) {
1326 snd_seq_client_unlock(cptr);
1327 return -ENOENT; /* don't change */
1328 }
1329
1330 /* get port info */
1331 snd_seq_get_port_info(port, &info);
1332 snd_seq_port_unlock(port);
1333 snd_seq_client_unlock(cptr);
1334
1335 if (copy_to_user(arg, &info, sizeof(info)))
1336 return -EFAULT;
1337 return 0;
1338 }
1339
1340
1341 /*
1342 * SET_PORT_INFO ioctl() (only ports on this/own client)
1343 */
1344 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client,
1345 void __user *arg)
1346 {
1347 struct snd_seq_client_port *port;
1348 struct snd_seq_port_info info;
1349
1350 if (copy_from_user(&info, arg, sizeof(info)))
1351 return -EFAULT;
1352
1353 if (info.addr.client != client->number) /* only set our own ports ! */
1354 return -EPERM;
1355 port = snd_seq_port_use_ptr(client, info.addr.port);
1356 if (port) {
1357 snd_seq_set_port_info(port, &info);
1358 snd_seq_port_unlock(port);
1359 }
1360 return 0;
1361 }
1362
1363
1364 /*
1365 * port subscription (connection)
1366 */
1367 #define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1368 #define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1369
1370 static int check_subscription_permission(struct snd_seq_client *client,
1371 struct snd_seq_client_port *sport,
1372 struct snd_seq_client_port *dport,
1373 struct snd_seq_port_subscribe *subs)
1374 {
1375 if (client->number != subs->sender.client &&
1376 client->number != subs->dest.client) {
1377 /* connection by third client - check export permission */
1378 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1379 return -EPERM;
1380 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1381 return -EPERM;
1382 }
1383
1384 /* check read permission */
1385 /* if sender or receiver is the subscribing client itself,
1386 * no permission check is necessary
1387 */
1388 if (client->number != subs->sender.client) {
1389 if (! check_port_perm(sport, PERM_RD))
1390 return -EPERM;
1391 }
1392 /* check write permission */
1393 if (client->number != subs->dest.client) {
1394 if (! check_port_perm(dport, PERM_WR))
1395 return -EPERM;
1396 }
1397 return 0;
1398 }
1399
1400 /*
1401 * send an subscription notify event to user client:
1402 * client must be user client.
1403 */
1404 int snd_seq_client_notify_subscription(int client, int port,
1405 struct snd_seq_port_subscribe *info,
1406 int evtype)
1407 {
1408 struct snd_seq_event event;
1409
1410 memset(&event, 0, sizeof(event));
1411 event.type = evtype;
1412 event.data.connect.dest = info->dest;
1413 event.data.connect.sender = info->sender;
1414
1415 return snd_seq_system_notify(client, port, &event); /* non-atomic */
1416 }
1417
1418
1419 /*
1420 * add to port's subscription list IOCTL interface
1421 */
1422 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
1423 void __user *arg)
1424 {
1425 int result = -EINVAL;
1426 struct snd_seq_client *receiver = NULL, *sender = NULL;
1427 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1428 struct snd_seq_port_subscribe subs;
1429
1430 if (copy_from_user(&subs, arg, sizeof(subs)))
1431 return -EFAULT;
1432
1433 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1434 goto __end;
1435 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1436 goto __end;
1437 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1438 goto __end;
1439 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1440 goto __end;
1441
1442 result = check_subscription_permission(client, sport, dport, &subs);
1443 if (result < 0)
1444 goto __end;
1445
1446 /* connect them */
1447 result = snd_seq_port_connect(client, sender, sport, receiver, dport, &subs);
1448 if (! result) /* broadcast announce */
1449 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1450 &subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1451 __end:
1452 if (sport)
1453 snd_seq_port_unlock(sport);
1454 if (dport)
1455 snd_seq_port_unlock(dport);
1456 if (sender)
1457 snd_seq_client_unlock(sender);
1458 if (receiver)
1459 snd_seq_client_unlock(receiver);
1460 return result;
1461 }
1462
1463
1464 /*
1465 * remove from port's subscription list
1466 */
1467 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
1468 void __user *arg)
1469 {
1470 int result = -ENXIO;
1471 struct snd_seq_client *receiver = NULL, *sender = NULL;
1472 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1473 struct snd_seq_port_subscribe subs;
1474
1475 if (copy_from_user(&subs, arg, sizeof(subs)))
1476 return -EFAULT;
1477
1478 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1479 goto __end;
1480 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1481 goto __end;
1482 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1483 goto __end;
1484 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1485 goto __end;
1486
1487 result = check_subscription_permission(client, sport, dport, &subs);
1488 if (result < 0)
1489 goto __end;
1490
1491 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, &subs);
1492 if (! result) /* broadcast announce */
1493 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1494 &subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1495 __end:
1496 if (sport)
1497 snd_seq_port_unlock(sport);
1498 if (dport)
1499 snd_seq_port_unlock(dport);
1500 if (sender)
1501 snd_seq_client_unlock(sender);
1502 if (receiver)
1503 snd_seq_client_unlock(receiver);
1504 return result;
1505 }
1506
1507
1508 /* CREATE_QUEUE ioctl() */
1509 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client,
1510 void __user *arg)
1511 {
1512 struct snd_seq_queue_info info;
1513 int result;
1514 struct snd_seq_queue *q;
1515
1516 if (copy_from_user(&info, arg, sizeof(info)))
1517 return -EFAULT;
1518
1519 result = snd_seq_queue_alloc(client->number, info.locked, info.flags);
1520 if (result < 0)
1521 return result;
1522
1523 q = queueptr(result);
1524 if (q == NULL)
1525 return -EINVAL;
1526
1527 info.queue = q->queue;
1528 info.locked = q->locked;
1529 info.owner = q->owner;
1530
1531 /* set queue name */
1532 if (! info.name[0])
1533 snprintf(info.name, sizeof(info.name), "Queue-%d", q->queue);
1534 strlcpy(q->name, info.name, sizeof(q->name));
1535 queuefree(q);
1536
1537 if (copy_to_user(arg, &info, sizeof(info)))
1538 return -EFAULT;
1539
1540 return 0;
1541 }
1542
1543 /* DELETE_QUEUE ioctl() */
1544 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client,
1545 void __user *arg)
1546 {
1547 struct snd_seq_queue_info info;
1548
1549 if (copy_from_user(&info, arg, sizeof(info)))
1550 return -EFAULT;
1551
1552 return snd_seq_queue_delete(client->number, info.queue);
1553 }
1554
1555 /* GET_QUEUE_INFO ioctl() */
1556 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client,
1557 void __user *arg)
1558 {
1559 struct snd_seq_queue_info info;
1560 struct snd_seq_queue *q;
1561
1562 if (copy_from_user(&info, arg, sizeof(info)))
1563 return -EFAULT;
1564
1565 q = queueptr(info.queue);
1566 if (q == NULL)
1567 return -EINVAL;
1568
1569 memset(&info, 0, sizeof(info));
1570 info.queue = q->queue;
1571 info.owner = q->owner;
1572 info.locked = q->locked;
1573 strlcpy(info.name, q->name, sizeof(info.name));
1574 queuefree(q);
1575
1576 if (copy_to_user(arg, &info, sizeof(info)))
1577 return -EFAULT;
1578
1579 return 0;
1580 }
1581
1582 /* SET_QUEUE_INFO ioctl() */
1583 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
1584 void __user *arg)
1585 {
1586 struct snd_seq_queue_info info;
1587 struct snd_seq_queue *q;
1588
1589 if (copy_from_user(&info, arg, sizeof(info)))
1590 return -EFAULT;
1591
1592 if (info.owner != client->number)
1593 return -EINVAL;
1594
1595 /* change owner/locked permission */
1596 if (snd_seq_queue_check_access(info.queue, client->number)) {
1597 if (snd_seq_queue_set_owner(info.queue, client->number, info.locked) < 0)
1598 return -EPERM;
1599 if (info.locked)
1600 snd_seq_queue_use(info.queue, client->number, 1);
1601 } else {
1602 return -EPERM;
1603 }
1604
1605 q = queueptr(info.queue);
1606 if (! q)
1607 return -EINVAL;
1608 if (q->owner != client->number) {
1609 queuefree(q);
1610 return -EPERM;
1611 }
1612 strlcpy(q->name, info.name, sizeof(q->name));
1613 queuefree(q);
1614
1615 return 0;
1616 }
1617
1618 /* GET_NAMED_QUEUE ioctl() */
1619 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client, void __user *arg)
1620 {
1621 struct snd_seq_queue_info info;
1622 struct snd_seq_queue *q;
1623
1624 if (copy_from_user(&info, arg, sizeof(info)))
1625 return -EFAULT;
1626
1627 q = snd_seq_queue_find_name(info.name);
1628 if (q == NULL)
1629 return -EINVAL;
1630 info.queue = q->queue;
1631 info.owner = q->owner;
1632 info.locked = q->locked;
1633 queuefree(q);
1634
1635 if (copy_to_user(arg, &info, sizeof(info)))
1636 return -EFAULT;
1637
1638 return 0;
1639 }
1640
1641 /* GET_QUEUE_STATUS ioctl() */
1642 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
1643 void __user *arg)
1644 {
1645 struct snd_seq_queue_status status;
1646 struct snd_seq_queue *queue;
1647 struct snd_seq_timer *tmr;
1648
1649 if (copy_from_user(&status, arg, sizeof(status)))
1650 return -EFAULT;
1651
1652 queue = queueptr(status.queue);
1653 if (queue == NULL)
1654 return -EINVAL;
1655 memset(&status, 0, sizeof(status));
1656 status.queue = queue->queue;
1657
1658 tmr = queue->timer;
1659 status.events = queue->tickq->cells + queue->timeq->cells;
1660
1661 status.time = snd_seq_timer_get_cur_time(tmr);
1662 status.tick = snd_seq_timer_get_cur_tick(tmr);
1663
1664 status.running = tmr->running;
1665
1666 status.flags = queue->flags;
1667 queuefree(queue);
1668
1669 if (copy_to_user(arg, &status, sizeof(status)))
1670 return -EFAULT;
1671 return 0;
1672 }
1673
1674
1675 /* GET_QUEUE_TEMPO ioctl() */
1676 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
1677 void __user *arg)
1678 {
1679 struct snd_seq_queue_tempo tempo;
1680 struct snd_seq_queue *queue;
1681 struct snd_seq_timer *tmr;
1682
1683 if (copy_from_user(&tempo, arg, sizeof(tempo)))
1684 return -EFAULT;
1685
1686 queue = queueptr(tempo.queue);
1687 if (queue == NULL)
1688 return -EINVAL;
1689 memset(&tempo, 0, sizeof(tempo));
1690 tempo.queue = queue->queue;
1691
1692 tmr = queue->timer;
1693
1694 tempo.tempo = tmr->tempo;
1695 tempo.ppq = tmr->ppq;
1696 tempo.skew_value = tmr->skew;
1697 tempo.skew_base = tmr->skew_base;
1698 queuefree(queue);
1699
1700 if (copy_to_user(arg, &tempo, sizeof(tempo)))
1701 return -EFAULT;
1702 return 0;
1703 }
1704
1705
1706 /* SET_QUEUE_TEMPO ioctl() */
1707 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1708 {
1709 if (!snd_seq_queue_check_access(tempo->queue, client))
1710 return -EPERM;
1711 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1712 }
1713
1714 EXPORT_SYMBOL(snd_seq_set_queue_tempo);
1715
1716 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
1717 void __user *arg)
1718 {
1719 int result;
1720 struct snd_seq_queue_tempo tempo;
1721
1722 if (copy_from_user(&tempo, arg, sizeof(tempo)))
1723 return -EFAULT;
1724
1725 result = snd_seq_set_queue_tempo(client->number, &tempo);
1726 return result < 0 ? result : 0;
1727 }
1728
1729
1730 /* GET_QUEUE_TIMER ioctl() */
1731 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
1732 void __user *arg)
1733 {
1734 struct snd_seq_queue_timer timer;
1735 struct snd_seq_queue *queue;
1736 struct snd_seq_timer *tmr;
1737
1738 if (copy_from_user(&timer, arg, sizeof(timer)))
1739 return -EFAULT;
1740
1741 queue = queueptr(timer.queue);
1742 if (queue == NULL)
1743 return -EINVAL;
1744
1745 if (mutex_lock_interruptible(&queue->timer_mutex)) {
1746 queuefree(queue);
1747 return -ERESTARTSYS;
1748 }
1749 tmr = queue->timer;
1750 memset(&timer, 0, sizeof(timer));
1751 timer.queue = queue->queue;
1752
1753 timer.type = tmr->type;
1754 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1755 timer.u.alsa.id = tmr->alsa_id;
1756 timer.u.alsa.resolution = tmr->preferred_resolution;
1757 }
1758 mutex_unlock(&queue->timer_mutex);
1759 queuefree(queue);
1760
1761 if (copy_to_user(arg, &timer, sizeof(timer)))
1762 return -EFAULT;
1763 return 0;
1764 }
1765
1766
1767 /* SET_QUEUE_TIMER ioctl() */
1768 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
1769 void __user *arg)
1770 {
1771 int result = 0;
1772 struct snd_seq_queue_timer timer;
1773
1774 if (copy_from_user(&timer, arg, sizeof(timer)))
1775 return -EFAULT;
1776
1777 if (timer.type != SNDRV_SEQ_TIMER_ALSA)
1778 return -EINVAL;
1779
1780 if (snd_seq_queue_check_access(timer.queue, client->number)) {
1781 struct snd_seq_queue *q;
1782 struct snd_seq_timer *tmr;
1783
1784 q = queueptr(timer.queue);
1785 if (q == NULL)
1786 return -ENXIO;
1787 if (mutex_lock_interruptible(&q->timer_mutex)) {
1788 queuefree(q);
1789 return -ERESTARTSYS;
1790 }
1791 tmr = q->timer;
1792 snd_seq_queue_timer_close(timer.queue);
1793 tmr->type = timer.type;
1794 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1795 tmr->alsa_id = timer.u.alsa.id;
1796 tmr->preferred_resolution = timer.u.alsa.resolution;
1797 }
1798 result = snd_seq_queue_timer_open(timer.queue);
1799 mutex_unlock(&q->timer_mutex);
1800 queuefree(q);
1801 } else {
1802 return -EPERM;
1803 }
1804
1805 return result;
1806 }
1807
1808
1809 /* GET_QUEUE_CLIENT ioctl() */
1810 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
1811 void __user *arg)
1812 {
1813 struct snd_seq_queue_client info;
1814 int used;
1815
1816 if (copy_from_user(&info, arg, sizeof(info)))
1817 return -EFAULT;
1818
1819 used = snd_seq_queue_is_used(info.queue, client->number);
1820 if (used < 0)
1821 return -EINVAL;
1822 info.used = used;
1823 info.client = client->number;
1824
1825 if (copy_to_user(arg, &info, sizeof(info)))
1826 return -EFAULT;
1827 return 0;
1828 }
1829
1830
1831 /* SET_QUEUE_CLIENT ioctl() */
1832 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
1833 void __user *arg)
1834 {
1835 int err;
1836 struct snd_seq_queue_client info;
1837
1838 if (copy_from_user(&info, arg, sizeof(info)))
1839 return -EFAULT;
1840
1841 if (info.used >= 0) {
1842 err = snd_seq_queue_use(info.queue, client->number, info.used);
1843 if (err < 0)
1844 return err;
1845 }
1846
1847 return snd_seq_ioctl_get_queue_client(client, arg);
1848 }
1849
1850
1851 /* GET_CLIENT_POOL ioctl() */
1852 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
1853 void __user *arg)
1854 {
1855 struct snd_seq_client_pool info;
1856 struct snd_seq_client *cptr;
1857
1858 if (copy_from_user(&info, arg, sizeof(info)))
1859 return -EFAULT;
1860
1861 cptr = snd_seq_client_use_ptr(info.client);
1862 if (cptr == NULL)
1863 return -ENOENT;
1864 memset(&info, 0, sizeof(info));
1865 info.output_pool = cptr->pool->size;
1866 info.output_room = cptr->pool->room;
1867 info.output_free = info.output_pool;
1868 info.output_free = snd_seq_unused_cells(cptr->pool);
1869 if (cptr->type == USER_CLIENT) {
1870 info.input_pool = cptr->data.user.fifo_pool_size;
1871 info.input_free = info.input_pool;
1872 if (cptr->data.user.fifo)
1873 info.input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool);
1874 } else {
1875 info.input_pool = 0;
1876 info.input_free = 0;
1877 }
1878 snd_seq_client_unlock(cptr);
1879
1880 if (copy_to_user(arg, &info, sizeof(info)))
1881 return -EFAULT;
1882 return 0;
1883 }
1884
1885 /* SET_CLIENT_POOL ioctl() */
1886 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
1887 void __user *arg)
1888 {
1889 struct snd_seq_client_pool info;
1890 int rc;
1891
1892 if (copy_from_user(&info, arg, sizeof(info)))
1893 return -EFAULT;
1894
1895 if (client->number != info.client)
1896 return -EINVAL; /* can't change other clients */
1897
1898 if (info.output_pool >= 1 && info.output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1899 (! snd_seq_write_pool_allocated(client) ||
1900 info.output_pool != client->pool->size)) {
1901 if (snd_seq_write_pool_allocated(client)) {
1902 /* remove all existing cells */
1903 snd_seq_queue_client_leave_cells(client->number);
1904 snd_seq_pool_done(client->pool);
1905 }
1906 client->pool->size = info.output_pool;
1907 rc = snd_seq_pool_init(client->pool);
1908 if (rc < 0)
1909 return rc;
1910 }
1911 if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
1912 info.input_pool >= 1 &&
1913 info.input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1914 info.input_pool != client->data.user.fifo_pool_size) {
1915 /* change pool size */
1916 rc = snd_seq_fifo_resize(client->data.user.fifo, info.input_pool);
1917 if (rc < 0)
1918 return rc;
1919 client->data.user.fifo_pool_size = info.input_pool;
1920 }
1921 if (info.output_room >= 1 &&
1922 info.output_room <= client->pool->size) {
1923 client->pool->room = info.output_room;
1924 }
1925
1926 return snd_seq_ioctl_get_client_pool(client, arg);
1927 }
1928
1929
1930 /* REMOVE_EVENTS ioctl() */
1931 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
1932 void __user *arg)
1933 {
1934 struct snd_seq_remove_events info;
1935
1936 if (copy_from_user(&info, arg, sizeof(info)))
1937 return -EFAULT;
1938
1939 /*
1940 * Input mostly not implemented XXX.
1941 */
1942 if (info.remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1943 /*
1944 * No restrictions so for a user client we can clear
1945 * the whole fifo
1946 */
1947 if (client->type == USER_CLIENT)
1948 snd_seq_fifo_clear(client->data.user.fifo);
1949 }
1950
1951 if (info.remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1952 snd_seq_queue_remove_cells(client->number, &info);
1953
1954 return 0;
1955 }
1956
1957
1958 /*
1959 * get subscription info
1960 */
1961 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
1962 void __user *arg)
1963 {
1964 int result;
1965 struct snd_seq_client *sender = NULL;
1966 struct snd_seq_client_port *sport = NULL;
1967 struct snd_seq_port_subscribe subs;
1968 struct snd_seq_subscribers *p;
1969
1970 if (copy_from_user(&subs, arg, sizeof(subs)))
1971 return -EFAULT;
1972
1973 result = -EINVAL;
1974 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1975 goto __end;
1976 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1977 goto __end;
1978 p = snd_seq_port_get_subscription(&sport->c_src, &subs.dest);
1979 if (p) {
1980 result = 0;
1981 subs = p->info;
1982 } else
1983 result = -ENOENT;
1984
1985 __end:
1986 if (sport)
1987 snd_seq_port_unlock(sport);
1988 if (sender)
1989 snd_seq_client_unlock(sender);
1990 if (result >= 0) {
1991 if (copy_to_user(arg, &subs, sizeof(subs)))
1992 return -EFAULT;
1993 }
1994 return result;
1995 }
1996
1997
1998 /*
1999 * get subscription info - check only its presence
2000 */
2001 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client,
2002 void __user *arg)
2003 {
2004 int result = -ENXIO;
2005 struct snd_seq_client *cptr = NULL;
2006 struct snd_seq_client_port *port = NULL;
2007 struct snd_seq_query_subs subs;
2008 struct snd_seq_port_subs_info *group;
2009 struct list_head *p;
2010 int i;
2011
2012 if (copy_from_user(&subs, arg, sizeof(subs)))
2013 return -EFAULT;
2014
2015 if ((cptr = snd_seq_client_use_ptr(subs.root.client)) == NULL)
2016 goto __end;
2017 if ((port = snd_seq_port_use_ptr(cptr, subs.root.port)) == NULL)
2018 goto __end;
2019
2020 switch (subs.type) {
2021 case SNDRV_SEQ_QUERY_SUBS_READ:
2022 group = &port->c_src;
2023 break;
2024 case SNDRV_SEQ_QUERY_SUBS_WRITE:
2025 group = &port->c_dest;
2026 break;
2027 default:
2028 goto __end;
2029 }
2030
2031 down_read(&group->list_mutex);
2032 /* search for the subscriber */
2033 subs.num_subs = group->count;
2034 i = 0;
2035 result = -ENOENT;
2036 list_for_each(p, &group->list_head) {
2037 if (i++ == subs.index) {
2038 /* found! */
2039 struct snd_seq_subscribers *s;
2040 if (subs.type == SNDRV_SEQ_QUERY_SUBS_READ) {
2041 s = list_entry(p, struct snd_seq_subscribers, src_list);
2042 subs.addr = s->info.dest;
2043 } else {
2044 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2045 subs.addr = s->info.sender;
2046 }
2047 subs.flags = s->info.flags;
2048 subs.queue = s->info.queue;
2049 result = 0;
2050 break;
2051 }
2052 }
2053 up_read(&group->list_mutex);
2054
2055 __end:
2056 if (port)
2057 snd_seq_port_unlock(port);
2058 if (cptr)
2059 snd_seq_client_unlock(cptr);
2060 if (result >= 0) {
2061 if (copy_to_user(arg, &subs, sizeof(subs)))
2062 return -EFAULT;
2063 }
2064 return result;
2065 }
2066
2067
2068 /*
2069 * query next client
2070 */
2071 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
2072 void __user *arg)
2073 {
2074 struct snd_seq_client *cptr = NULL;
2075 struct snd_seq_client_info info;
2076
2077 if (copy_from_user(&info, arg, sizeof(info)))
2078 return -EFAULT;
2079
2080 /* search for next client */
2081 info.client++;
2082 if (info.client < 0)
2083 info.client = 0;
2084 for (; info.client < SNDRV_SEQ_MAX_CLIENTS; info.client++) {
2085 cptr = snd_seq_client_use_ptr(info.client);
2086 if (cptr)
2087 break; /* found */
2088 }
2089 if (cptr == NULL)
2090 return -ENOENT;
2091
2092 get_client_info(cptr, &info);
2093 snd_seq_client_unlock(cptr);
2094
2095 if (copy_to_user(arg, &info, sizeof(info)))
2096 return -EFAULT;
2097 return 0;
2098 }
2099
2100 /*
2101 * query next port
2102 */
2103 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
2104 void __user *arg)
2105 {
2106 struct snd_seq_client *cptr;
2107 struct snd_seq_client_port *port = NULL;
2108 struct snd_seq_port_info info;
2109
2110 if (copy_from_user(&info, arg, sizeof(info)))
2111 return -EFAULT;
2112 cptr = snd_seq_client_use_ptr(info.addr.client);
2113 if (cptr == NULL)
2114 return -ENXIO;
2115
2116 /* search for next port */
2117 info.addr.port++;
2118 port = snd_seq_port_query_nearest(cptr, &info);
2119 if (port == NULL) {
2120 snd_seq_client_unlock(cptr);
2121 return -ENOENT;
2122 }
2123
2124 /* get port info */
2125 info.addr = port->addr;
2126 snd_seq_get_port_info(port, &info);
2127 snd_seq_port_unlock(port);
2128 snd_seq_client_unlock(cptr);
2129
2130 if (copy_to_user(arg, &info, sizeof(info)))
2131 return -EFAULT;
2132 return 0;
2133 }
2134
2135 /* -------------------------------------------------------- */
2136
2137 static struct seq_ioctl_table {
2138 unsigned int cmd;
2139 int (*func)(struct snd_seq_client *client, void __user * arg);
2140 } ioctl_tables[] = {
2141 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2142 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2143 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2144 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2145 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2146 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2147 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2148 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2149 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2150 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2151 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2152 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2153 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2154 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2155 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2156 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2157 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2158 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2159 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2160 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2161 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2162 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2163 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2164 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2165 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2166 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2167 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2168 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2169 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2170 { 0, NULL },
2171 };
2172
2173 static int snd_seq_do_ioctl(struct snd_seq_client *client, unsigned int cmd,
2174 void __user *arg)
2175 {
2176 struct seq_ioctl_table *p;
2177
2178 switch (cmd) {
2179 case SNDRV_SEQ_IOCTL_PVERSION:
2180 /* return sequencer version number */
2181 return put_user(SNDRV_SEQ_VERSION, (int __user *)arg) ? -EFAULT : 0;
2182 case SNDRV_SEQ_IOCTL_CLIENT_ID:
2183 /* return the id of this client */
2184 return put_user(client->number, (int __user *)arg) ? -EFAULT : 0;
2185 }
2186
2187 if (! arg)
2188 return -EFAULT;
2189 for (p = ioctl_tables; p->cmd; p++) {
2190 if (p->cmd == cmd)
2191 return p->func(client, arg);
2192 }
2193 snd_printd("seq unknown ioctl() 0x%x (type='%c', number=0x%2x)\n",
2194 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2195 return -ENOTTY;
2196 }
2197
2198
2199 static long snd_seq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2200 {
2201 struct snd_seq_client *client = file->private_data;
2202
2203 if (snd_BUG_ON(!client))
2204 return -ENXIO;
2205
2206 return snd_seq_do_ioctl(client, cmd, (void __user *) arg);
2207 }
2208
2209 #ifdef CONFIG_COMPAT
2210 #include "seq_compat.c"
2211 #else
2212 #define snd_seq_ioctl_compat NULL
2213 #endif
2214
2215 /* -------------------------------------------------------- */
2216
2217
2218 /* exported to kernel modules */
2219 int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
2220 const char *name_fmt, ...)
2221 {
2222 struct snd_seq_client *client;
2223 va_list args;
2224
2225 if (snd_BUG_ON(in_interrupt()))
2226 return -EBUSY;
2227
2228 if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD)
2229 return -EINVAL;
2230 if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
2231 return -EINVAL;
2232
2233 if (mutex_lock_interruptible(&register_mutex))
2234 return -ERESTARTSYS;
2235
2236 if (card) {
2237 client_index += SNDRV_SEQ_GLOBAL_CLIENTS
2238 + card->number * SNDRV_SEQ_CLIENTS_PER_CARD;
2239 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN)
2240 client_index = -1;
2241 }
2242
2243 /* empty write queue as default */
2244 client = seq_create_client1(client_index, 0);
2245 if (client == NULL) {
2246 mutex_unlock(&register_mutex);
2247 return -EBUSY; /* failure code */
2248 }
2249 usage_alloc(&client_usage, 1);
2250
2251 client->accept_input = 1;
2252 client->accept_output = 1;
2253
2254 va_start(args, name_fmt);
2255 vsnprintf(client->name, sizeof(client->name), name_fmt, args);
2256 va_end(args);
2257
2258 client->type = KERNEL_CLIENT;
2259 mutex_unlock(&register_mutex);
2260
2261 /* make others aware this new client */
2262 snd_seq_system_client_ev_client_start(client->number);
2263
2264 /* return client number to caller */
2265 return client->number;
2266 }
2267
2268 EXPORT_SYMBOL(snd_seq_create_kernel_client);
2269
2270 /* exported to kernel modules */
2271 int snd_seq_delete_kernel_client(int client)
2272 {
2273 struct snd_seq_client *ptr;
2274
2275 if (snd_BUG_ON(in_interrupt()))
2276 return -EBUSY;
2277
2278 ptr = clientptr(client);
2279 if (ptr == NULL)
2280 return -EINVAL;
2281
2282 seq_free_client(ptr);
2283 kfree(ptr);
2284 return 0;
2285 }
2286
2287 EXPORT_SYMBOL(snd_seq_delete_kernel_client);
2288
2289 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue
2290 * and snd_seq_kernel_client_enqueue_blocking
2291 */
2292 static int kernel_client_enqueue(int client, struct snd_seq_event *ev,
2293 struct file *file, int blocking,
2294 int atomic, int hop)
2295 {
2296 struct snd_seq_client *cptr;
2297 int result;
2298
2299 if (snd_BUG_ON(!ev))
2300 return -EINVAL;
2301
2302 if (ev->type == SNDRV_SEQ_EVENT_NONE)
2303 return 0; /* ignore this */
2304 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2305 return -EINVAL; /* quoted events can't be enqueued */
2306
2307 /* fill in client number */
2308 ev->source.client = client;
2309
2310 if (check_event_type_and_length(ev))
2311 return -EINVAL;
2312
2313 cptr = snd_seq_client_use_ptr(client);
2314 if (cptr == NULL)
2315 return -EINVAL;
2316
2317 if (! cptr->accept_output)
2318 result = -EPERM;
2319 else /* send it */
2320 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, atomic, hop);
2321
2322 snd_seq_client_unlock(cptr);
2323 return result;
2324 }
2325
2326 /*
2327 * exported, called by kernel clients to enqueue events (w/o blocking)
2328 *
2329 * RETURN VALUE: zero if succeed, negative if error
2330 */
2331 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev,
2332 int atomic, int hop)
2333 {
2334 return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop);
2335 }
2336
2337 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
2338
2339 /*
2340 * exported, called by kernel clients to enqueue events (with blocking)
2341 *
2342 * RETURN VALUE: zero if succeed, negative if error
2343 */
2344 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev,
2345 struct file *file,
2346 int atomic, int hop)
2347 {
2348 return kernel_client_enqueue(client, ev, file, 1, atomic, hop);
2349 }
2350
2351 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking);
2352
2353 /*
2354 * exported, called by kernel clients to dispatch events directly to other
2355 * clients, bypassing the queues. Event time-stamp will be updated.
2356 *
2357 * RETURN VALUE: negative = delivery failed,
2358 * zero, or positive: the number of delivered events
2359 */
2360 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev,
2361 int atomic, int hop)
2362 {
2363 struct snd_seq_client *cptr;
2364 int result;
2365
2366 if (snd_BUG_ON(!ev))
2367 return -EINVAL;
2368
2369 /* fill in client number */
2370 ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2371 ev->source.client = client;
2372
2373 if (check_event_type_and_length(ev))
2374 return -EINVAL;
2375
2376 cptr = snd_seq_client_use_ptr(client);
2377 if (cptr == NULL)
2378 return -EINVAL;
2379
2380 if (!cptr->accept_output)
2381 result = -EPERM;
2382 else
2383 result = snd_seq_deliver_event(cptr, ev, atomic, hop);
2384
2385 snd_seq_client_unlock(cptr);
2386 return result;
2387 }
2388
2389 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch);
2390
2391 /*
2392 * exported, called by kernel clients to perform same functions as with
2393 * userland ioctl()
2394 */
2395 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2396 {
2397 struct snd_seq_client *client;
2398 mm_segment_t fs;
2399 int result;
2400
2401 client = clientptr(clientid);
2402 if (client == NULL)
2403 return -ENXIO;
2404 fs = snd_enter_user();
2405 result = snd_seq_do_ioctl(client, cmd, (void __user *)arg);
2406 snd_leave_user(fs);
2407 return result;
2408 }
2409
2410 EXPORT_SYMBOL(snd_seq_kernel_client_ctl);
2411
2412 /* exported (for OSS emulator) */
2413 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2414 {
2415 struct snd_seq_client *client;
2416
2417 client = clientptr(clientid);
2418 if (client == NULL)
2419 return -ENXIO;
2420
2421 if (! snd_seq_write_pool_allocated(client))
2422 return 1;
2423 if (snd_seq_pool_poll_wait(client->pool, file, wait))
2424 return 1;
2425 return 0;
2426 }
2427
2428 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll);
2429
2430 /*---------------------------------------------------------------------------*/
2431
2432 #ifdef CONFIG_PROC_FS
2433 /*
2434 * /proc interface
2435 */
2436 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer,
2437 struct snd_seq_port_subs_info *group,
2438 int is_src, char *msg)
2439 {
2440 struct list_head *p;
2441 struct snd_seq_subscribers *s;
2442 int count = 0;
2443
2444 down_read(&group->list_mutex);
2445 if (list_empty(&group->list_head)) {
2446 up_read(&group->list_mutex);
2447 return;
2448 }
2449 snd_iprintf(buffer, msg);
2450 list_for_each(p, &group->list_head) {
2451 if (is_src)
2452 s = list_entry(p, struct snd_seq_subscribers, src_list);
2453 else
2454 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2455 if (count++)
2456 snd_iprintf(buffer, ", ");
2457 snd_iprintf(buffer, "%d:%d",
2458 is_src ? s->info.dest.client : s->info.sender.client,
2459 is_src ? s->info.dest.port : s->info.sender.port);
2460 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
2461 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
2462 if (group->exclusive)
2463 snd_iprintf(buffer, "[ex]");
2464 }
2465 up_read(&group->list_mutex);
2466 snd_iprintf(buffer, "\n");
2467 }
2468
2469 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
2470 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
2471 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
2472
2473 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2474
2475 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
2476 struct snd_seq_client *client)
2477 {
2478 struct snd_seq_client_port *p;
2479
2480 mutex_lock(&client->ports_mutex);
2481 list_for_each_entry(p, &client->ports_list_head, list) {
2482 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c)\n",
2483 p->addr.port, p->name,
2484 FLAG_PERM_RD(p->capability),
2485 FLAG_PERM_WR(p->capability),
2486 FLAG_PERM_EX(p->capability),
2487 FLAG_PERM_DUPLEX(p->capability));
2488 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: ");
2489 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: ");
2490 }
2491 mutex_unlock(&client->ports_mutex);
2492 }
2493
2494
2495 void snd_seq_info_pool(struct snd_info_buffer *buffer,
2496 struct snd_seq_pool *pool, char *space);
2497
2498 /* exported to seq_info.c */
2499 void snd_seq_info_clients_read(struct snd_info_entry *entry,
2500 struct snd_info_buffer *buffer)
2501 {
2502 int c;
2503 struct snd_seq_client *client;
2504
2505 snd_iprintf(buffer, "Client info\n");
2506 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur);
2507 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak);
2508 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
2509 snd_iprintf(buffer, "\n");
2510
2511 /* list the client table */
2512 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2513 client = snd_seq_client_use_ptr(c);
2514 if (client == NULL)
2515 continue;
2516 if (client->type == NO_CLIENT) {
2517 snd_seq_client_unlock(client);
2518 continue;
2519 }
2520
2521 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n",
2522 c, client->name,
2523 client->type == USER_CLIENT ? "User" : "Kernel");
2524 snd_seq_info_dump_ports(buffer, client);
2525 if (snd_seq_write_pool_allocated(client)) {
2526 snd_iprintf(buffer, " Output pool :\n");
2527 snd_seq_info_pool(buffer, client->pool, " ");
2528 }
2529 if (client->type == USER_CLIENT && client->data.user.fifo &&
2530 client->data.user.fifo->pool) {
2531 snd_iprintf(buffer, " Input pool :\n");
2532 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " ");
2533 }
2534 snd_seq_client_unlock(client);
2535 }
2536 }
2537 #endif /* CONFIG_PROC_FS */
2538
2539 /*---------------------------------------------------------------------------*/
2540
2541
2542 /*
2543 * REGISTRATION PART
2544 */
2545
2546 static const struct file_operations snd_seq_f_ops =
2547 {
2548 .owner = THIS_MODULE,
2549 .read = snd_seq_read,
2550 .write = snd_seq_write,
2551 .open = snd_seq_open,
2552 .release = snd_seq_release,
2553 .poll = snd_seq_poll,
2554 .unlocked_ioctl = snd_seq_ioctl,
2555 .compat_ioctl = snd_seq_ioctl_compat,
2556 };
2557
2558 /*
2559 * register sequencer device
2560 */
2561 int __init snd_sequencer_device_init(void)
2562 {
2563 int err;
2564
2565 if (mutex_lock_interruptible(&register_mutex))
2566 return -ERESTARTSYS;
2567
2568 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
2569 &snd_seq_f_ops, NULL, "seq")) < 0) {
2570 mutex_unlock(&register_mutex);
2571 return err;
2572 }
2573
2574 mutex_unlock(&register_mutex);
2575
2576 return 0;
2577 }
2578
2579
2580
2581 /*
2582 * unregister sequencer device
2583 */
2584 void __exit snd_sequencer_device_done(void)
2585 {
2586 snd_unregister_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0);
2587 }
mm of the moment repository