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Merge branches 'x86/amd', 'x86/vt-d', 'arm/exynos', 'arm/mediatek' and 'arm/renesas...
[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 client->data.user.owner = get_pid(task_pid(current));
368
369 /* make others aware this new client */
370 snd_seq_system_client_ev_client_start(c);
371
372 return 0;
373 }
374
375 /* delete a user client */
376 static int snd_seq_release(struct inode *inode, struct file *file)
377 {
378 struct snd_seq_client *client = file->private_data;
379
380 if (client) {
381 seq_free_client(client);
382 if (client->data.user.fifo)
383 snd_seq_fifo_delete(&client->data.user.fifo);
384 put_pid(client->data.user.owner);
385 kfree(client);
386 }
387
388 return 0;
389 }
390
391
392 /* handle client read() */
393 /* possible error values:
394 * -ENXIO invalid client or file open mode
395 * -ENOSPC FIFO overflow (the flag is cleared after this error report)
396 * -EINVAL no enough user-space buffer to write the whole event
397 * -EFAULT seg. fault during copy to user space
398 */
399 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count,
400 loff_t *offset)
401 {
402 struct snd_seq_client *client = file->private_data;
403 struct snd_seq_fifo *fifo;
404 int err;
405 long result = 0;
406 struct snd_seq_event_cell *cell;
407
408 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT))
409 return -ENXIO;
410
411 if (!access_ok(VERIFY_WRITE, buf, count))
412 return -EFAULT;
413
414 /* check client structures are in place */
415 if (snd_BUG_ON(!client))
416 return -ENXIO;
417
418 if (!client->accept_input || (fifo = client->data.user.fifo) == NULL)
419 return -ENXIO;
420
421 if (atomic_read(&fifo->overflow) > 0) {
422 /* buffer overflow is detected */
423 snd_seq_fifo_clear(fifo);
424 /* return error code */
425 return -ENOSPC;
426 }
427
428 cell = NULL;
429 err = 0;
430 snd_seq_fifo_lock(fifo);
431
432 /* while data available in queue */
433 while (count >= sizeof(struct snd_seq_event)) {
434 int nonblock;
435
436 nonblock = (file->f_flags & O_NONBLOCK) || result > 0;
437 if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) {
438 break;
439 }
440 if (snd_seq_ev_is_variable(&cell->event)) {
441 struct snd_seq_event tmpev;
442 tmpev = cell->event;
443 tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
444 if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) {
445 err = -EFAULT;
446 break;
447 }
448 count -= sizeof(struct snd_seq_event);
449 buf += sizeof(struct snd_seq_event);
450 err = snd_seq_expand_var_event(&cell->event, count,
451 (char __force *)buf, 0,
452 sizeof(struct snd_seq_event));
453 if (err < 0)
454 break;
455 result += err;
456 count -= err;
457 buf += err;
458 } else {
459 if (copy_to_user(buf, &cell->event, sizeof(struct snd_seq_event))) {
460 err = -EFAULT;
461 break;
462 }
463 count -= sizeof(struct snd_seq_event);
464 buf += sizeof(struct snd_seq_event);
465 }
466 snd_seq_cell_free(cell);
467 cell = NULL; /* to be sure */
468 result += sizeof(struct snd_seq_event);
469 }
470
471 if (err < 0) {
472 if (cell)
473 snd_seq_fifo_cell_putback(fifo, cell);
474 if (err == -EAGAIN && result > 0)
475 err = 0;
476 }
477 snd_seq_fifo_unlock(fifo);
478
479 return (err < 0) ? err : result;
480 }
481
482
483 /*
484 * check access permission to the port
485 */
486 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags)
487 {
488 if ((port->capability & flags) != flags)
489 return 0;
490 return flags;
491 }
492
493 /*
494 * check if the destination client is available, and return the pointer
495 * if filter is non-zero, client filter bitmap is tested.
496 */
497 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event,
498 int filter)
499 {
500 struct snd_seq_client *dest;
501
502 dest = snd_seq_client_use_ptr(event->dest.client);
503 if (dest == NULL)
504 return NULL;
505 if (! dest->accept_input)
506 goto __not_avail;
507 if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) &&
508 ! test_bit(event->type, dest->event_filter))
509 goto __not_avail;
510 if (filter && !(dest->filter & filter))
511 goto __not_avail;
512
513 return dest; /* ok - accessible */
514 __not_avail:
515 snd_seq_client_unlock(dest);
516 return NULL;
517 }
518
519
520 /*
521 * Return the error event.
522 *
523 * If the receiver client is a user client, the original event is
524 * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event. If
525 * the original event is also variable length, the external data is
526 * copied after the event record.
527 * If the receiver client is a kernel client, the original event is
528 * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra
529 * kmalloc.
530 */
531 static int bounce_error_event(struct snd_seq_client *client,
532 struct snd_seq_event *event,
533 int err, int atomic, int hop)
534 {
535 struct snd_seq_event bounce_ev;
536 int result;
537
538 if (client == NULL ||
539 ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) ||
540 ! client->accept_input)
541 return 0; /* ignored */
542
543 /* set up quoted error */
544 memset(&bounce_ev, 0, sizeof(bounce_ev));
545 bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR;
546 bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED;
547 bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT;
548 bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
549 bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
550 bounce_ev.dest.client = client->number;
551 bounce_ev.dest.port = event->source.port;
552 bounce_ev.data.quote.origin = event->dest;
553 bounce_ev.data.quote.event = event;
554 bounce_ev.data.quote.value = -err; /* use positive value */
555 result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1);
556 if (result < 0) {
557 client->event_lost++;
558 return result;
559 }
560
561 return result;
562 }
563
564
565 /*
566 * rewrite the time-stamp of the event record with the curren time
567 * of the given queue.
568 * return non-zero if updated.
569 */
570 static int update_timestamp_of_queue(struct snd_seq_event *event,
571 int queue, int real_time)
572 {
573 struct snd_seq_queue *q;
574
575 q = queueptr(queue);
576 if (! q)
577 return 0;
578 event->queue = queue;
579 event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK;
580 if (real_time) {
581 event->time.time = snd_seq_timer_get_cur_time(q->timer);
582 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL;
583 } else {
584 event->time.tick = snd_seq_timer_get_cur_tick(q->timer);
585 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK;
586 }
587 queuefree(q);
588 return 1;
589 }
590
591
592 /*
593 * deliver an event to the specified destination.
594 * if filter is non-zero, client filter bitmap is tested.
595 *
596 * RETURN VALUE: 0 : if succeeded
597 * <0 : error
598 */
599 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
600 struct snd_seq_event *event,
601 int filter, int atomic, int hop)
602 {
603 struct snd_seq_client *dest = NULL;
604 struct snd_seq_client_port *dest_port = NULL;
605 int result = -ENOENT;
606 int direct;
607
608 direct = snd_seq_ev_is_direct(event);
609
610 dest = get_event_dest_client(event, filter);
611 if (dest == NULL)
612 goto __skip;
613 dest_port = snd_seq_port_use_ptr(dest, event->dest.port);
614 if (dest_port == NULL)
615 goto __skip;
616
617 /* check permission */
618 if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) {
619 result = -EPERM;
620 goto __skip;
621 }
622
623 if (dest_port->timestamping)
624 update_timestamp_of_queue(event, dest_port->time_queue,
625 dest_port->time_real);
626
627 switch (dest->type) {
628 case USER_CLIENT:
629 if (dest->data.user.fifo)
630 result = snd_seq_fifo_event_in(dest->data.user.fifo, event);
631 break;
632
633 case KERNEL_CLIENT:
634 if (dest_port->event_input == NULL)
635 break;
636 result = dest_port->event_input(event, direct,
637 dest_port->private_data,
638 atomic, hop);
639 break;
640 default:
641 break;
642 }
643
644 __skip:
645 if (dest_port)
646 snd_seq_port_unlock(dest_port);
647 if (dest)
648 snd_seq_client_unlock(dest);
649
650 if (result < 0 && !direct) {
651 result = bounce_error_event(client, event, result, atomic, hop);
652 }
653 return result;
654 }
655
656
657 /*
658 * send the event to all subscribers:
659 */
660 static int deliver_to_subscribers(struct snd_seq_client *client,
661 struct snd_seq_event *event,
662 int atomic, int hop)
663 {
664 struct snd_seq_subscribers *subs;
665 int err, result = 0, num_ev = 0;
666 struct snd_seq_event event_saved;
667 struct snd_seq_client_port *src_port;
668 struct snd_seq_port_subs_info *grp;
669
670 src_port = snd_seq_port_use_ptr(client, event->source.port);
671 if (src_port == NULL)
672 return -EINVAL; /* invalid source port */
673 /* save original event record */
674 event_saved = *event;
675 grp = &src_port->c_src;
676
677 /* lock list */
678 if (atomic)
679 read_lock(&grp->list_lock);
680 else
681 down_read(&grp->list_mutex);
682 list_for_each_entry(subs, &grp->list_head, src_list) {
683 /* both ports ready? */
684 if (atomic_read(&subs->ref_count) != 2)
685 continue;
686 event->dest = subs->info.dest;
687 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
688 /* convert time according to flag with subscription */
689 update_timestamp_of_queue(event, subs->info.queue,
690 subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL);
691 err = snd_seq_deliver_single_event(client, event,
692 0, atomic, hop);
693 if (err < 0) {
694 /* save first error that occurs and continue */
695 if (!result)
696 result = err;
697 continue;
698 }
699 num_ev++;
700 /* restore original event record */
701 *event = event_saved;
702 }
703 if (atomic)
704 read_unlock(&grp->list_lock);
705 else
706 up_read(&grp->list_mutex);
707 *event = event_saved; /* restore */
708 snd_seq_port_unlock(src_port);
709 return (result < 0) ? result : num_ev;
710 }
711
712
713 #ifdef SUPPORT_BROADCAST
714 /*
715 * broadcast to all ports:
716 */
717 static int port_broadcast_event(struct snd_seq_client *client,
718 struct snd_seq_event *event,
719 int atomic, int hop)
720 {
721 int num_ev = 0, err, result = 0;
722 struct snd_seq_client *dest_client;
723 struct snd_seq_client_port *port;
724
725 dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST);
726 if (dest_client == NULL)
727 return 0; /* no matching destination */
728
729 read_lock(&dest_client->ports_lock);
730 list_for_each_entry(port, &dest_client->ports_list_head, list) {
731 event->dest.port = port->addr.port;
732 /* pass NULL as source client to avoid error bounce */
733 err = snd_seq_deliver_single_event(NULL, event,
734 SNDRV_SEQ_FILTER_BROADCAST,
735 atomic, hop);
736 if (err < 0) {
737 /* save first error that occurs and continue */
738 if (!result)
739 result = err;
740 continue;
741 }
742 num_ev++;
743 }
744 read_unlock(&dest_client->ports_lock);
745 snd_seq_client_unlock(dest_client);
746 event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */
747 return (result < 0) ? result : num_ev;
748 }
749
750 /*
751 * send the event to all clients:
752 * if destination port is also ADDRESS_BROADCAST, deliver to all ports.
753 */
754 static int broadcast_event(struct snd_seq_client *client,
755 struct snd_seq_event *event, int atomic, int hop)
756 {
757 int err, result = 0, num_ev = 0;
758 int dest;
759 struct snd_seq_addr addr;
760
761 addr = event->dest; /* save */
762
763 for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) {
764 /* don't send to itself */
765 if (dest == client->number)
766 continue;
767 event->dest.client = dest;
768 event->dest.port = addr.port;
769 if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST)
770 err = port_broadcast_event(client, event, atomic, hop);
771 else
772 /* pass NULL as source client to avoid error bounce */
773 err = snd_seq_deliver_single_event(NULL, event,
774 SNDRV_SEQ_FILTER_BROADCAST,
775 atomic, hop);
776 if (err < 0) {
777 /* save first error that occurs and continue */
778 if (!result)
779 result = err;
780 continue;
781 }
782 num_ev += err;
783 }
784 event->dest = addr; /* restore */
785 return (result < 0) ? result : num_ev;
786 }
787
788
789 /* multicast - not supported yet */
790 static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event,
791 int atomic, int hop)
792 {
793 pr_debug("ALSA: seq: multicast not supported yet.\n");
794 return 0; /* ignored */
795 }
796 #endif /* SUPPORT_BROADCAST */
797
798
799 /* deliver an event to the destination port(s).
800 * if the event is to subscribers or broadcast, the event is dispatched
801 * to multiple targets.
802 *
803 * RETURN VALUE: n > 0 : the number of delivered events.
804 * n == 0 : the event was not passed to any client.
805 * n < 0 : error - event was not processed.
806 */
807 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event,
808 int atomic, int hop)
809 {
810 int result;
811
812 hop++;
813 if (hop >= SNDRV_SEQ_MAX_HOPS) {
814 pr_debug("ALSA: seq: too long delivery path (%d:%d->%d:%d)\n",
815 event->source.client, event->source.port,
816 event->dest.client, event->dest.port);
817 return -EMLINK;
818 }
819
820 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS ||
821 event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS)
822 result = deliver_to_subscribers(client, event, atomic, hop);
823 #ifdef SUPPORT_BROADCAST
824 else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST ||
825 event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST)
826 result = broadcast_event(client, event, atomic, hop);
827 else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS)
828 result = multicast_event(client, event, atomic, hop);
829 else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST)
830 result = port_broadcast_event(client, event, atomic, hop);
831 #endif
832 else
833 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop);
834
835 return result;
836 }
837
838 /*
839 * dispatch an event cell:
840 * This function is called only from queue check routines in timer
841 * interrupts or after enqueued.
842 * The event cell shall be released or re-queued in this function.
843 *
844 * RETURN VALUE: n > 0 : the number of delivered events.
845 * n == 0 : the event was not passed to any client.
846 * n < 0 : error - event was not processed.
847 */
848 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop)
849 {
850 struct snd_seq_client *client;
851 int result;
852
853 if (snd_BUG_ON(!cell))
854 return -EINVAL;
855
856 client = snd_seq_client_use_ptr(cell->event.source.client);
857 if (client == NULL) {
858 snd_seq_cell_free(cell); /* release this cell */
859 return -EINVAL;
860 }
861
862 if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) {
863 /* NOTE event:
864 * the event cell is re-used as a NOTE-OFF event and
865 * enqueued again.
866 */
867 struct snd_seq_event tmpev, *ev;
868
869 /* reserve this event to enqueue note-off later */
870 tmpev = cell->event;
871 tmpev.type = SNDRV_SEQ_EVENT_NOTEON;
872 result = snd_seq_deliver_event(client, &tmpev, atomic, hop);
873
874 /*
875 * This was originally a note event. We now re-use the
876 * cell for the note-off event.
877 */
878
879 ev = &cell->event;
880 ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
881 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH;
882
883 /* add the duration time */
884 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) {
885 case SNDRV_SEQ_TIME_STAMP_TICK:
886 ev->time.tick += ev->data.note.duration;
887 break;
888 case SNDRV_SEQ_TIME_STAMP_REAL:
889 /* unit for duration is ms */
890 ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000);
891 ev->time.time.tv_sec += ev->data.note.duration / 1000 +
892 ev->time.time.tv_nsec / 1000000000;
893 ev->time.time.tv_nsec %= 1000000000;
894 break;
895 }
896 ev->data.note.velocity = ev->data.note.off_velocity;
897
898 /* Now queue this cell as the note off event */
899 if (snd_seq_enqueue_event(cell, atomic, hop) < 0)
900 snd_seq_cell_free(cell); /* release this cell */
901
902 } else {
903 /* Normal events:
904 * event cell is freed after processing the event
905 */
906
907 result = snd_seq_deliver_event(client, &cell->event, atomic, hop);
908 snd_seq_cell_free(cell);
909 }
910
911 snd_seq_client_unlock(client);
912 return result;
913 }
914
915
916 /* Allocate a cell from client pool and enqueue it to queue:
917 * if pool is empty and blocking is TRUE, sleep until a new cell is
918 * available.
919 */
920 static int snd_seq_client_enqueue_event(struct snd_seq_client *client,
921 struct snd_seq_event *event,
922 struct file *file, int blocking,
923 int atomic, int hop)
924 {
925 struct snd_seq_event_cell *cell;
926 int err;
927
928 /* special queue values - force direct passing */
929 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
930 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
931 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
932 } else
933 #ifdef SUPPORT_BROADCAST
934 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) {
935 event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST;
936 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
937 }
938 #endif
939 if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
940 /* check presence of source port */
941 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port);
942 if (src_port == NULL)
943 return -EINVAL;
944 snd_seq_port_unlock(src_port);
945 }
946
947 /* direct event processing without enqueued */
948 if (snd_seq_ev_is_direct(event)) {
949 if (event->type == SNDRV_SEQ_EVENT_NOTE)
950 return -EINVAL; /* this event must be enqueued! */
951 return snd_seq_deliver_event(client, event, atomic, hop);
952 }
953
954 /* Not direct, normal queuing */
955 if (snd_seq_queue_is_used(event->queue, client->number) <= 0)
956 return -EINVAL; /* invalid queue */
957 if (! snd_seq_write_pool_allocated(client))
958 return -ENXIO; /* queue is not allocated */
959
960 /* allocate an event cell */
961 err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, file);
962 if (err < 0)
963 return err;
964
965 /* we got a cell. enqueue it. */
966 if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
967 snd_seq_cell_free(cell);
968 return err;
969 }
970
971 return 0;
972 }
973
974
975 /*
976 * check validity of event type and data length.
977 * return non-zero if invalid.
978 */
979 static int check_event_type_and_length(struct snd_seq_event *ev)
980 {
981 switch (snd_seq_ev_length_type(ev)) {
982 case SNDRV_SEQ_EVENT_LENGTH_FIXED:
983 if (snd_seq_ev_is_variable_type(ev))
984 return -EINVAL;
985 break;
986 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
987 if (! snd_seq_ev_is_variable_type(ev) ||
988 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
989 return -EINVAL;
990 break;
991 case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
992 if (! snd_seq_ev_is_direct(ev))
993 return -EINVAL;
994 break;
995 }
996 return 0;
997 }
998
999
1000 /* handle write() */
1001 /* possible error values:
1002 * -ENXIO invalid client or file open mode
1003 * -ENOMEM malloc failed
1004 * -EFAULT seg. fault during copy from user space
1005 * -EINVAL invalid event
1006 * -EAGAIN no space in output pool
1007 * -EINTR interrupts while sleep
1008 * -EMLINK too many hops
1009 * others depends on return value from driver callback
1010 */
1011 static ssize_t snd_seq_write(struct file *file, const char __user *buf,
1012 size_t count, loff_t *offset)
1013 {
1014 struct snd_seq_client *client = file->private_data;
1015 int written = 0, len;
1016 int err = -EINVAL;
1017 struct snd_seq_event event;
1018
1019 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
1020 return -ENXIO;
1021
1022 /* check client structures are in place */
1023 if (snd_BUG_ON(!client))
1024 return -ENXIO;
1025
1026 if (!client->accept_output || client->pool == NULL)
1027 return -ENXIO;
1028
1029 /* allocate the pool now if the pool is not allocated yet */
1030 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
1031 if (snd_seq_pool_init(client->pool) < 0)
1032 return -ENOMEM;
1033 }
1034
1035 /* only process whole events */
1036 while (count >= sizeof(struct snd_seq_event)) {
1037 /* Read in the event header from the user */
1038 len = sizeof(event);
1039 if (copy_from_user(&event, buf, len)) {
1040 err = -EFAULT;
1041 break;
1042 }
1043 event.source.client = client->number; /* fill in client number */
1044 /* Check for extension data length */
1045 if (check_event_type_and_length(&event)) {
1046 err = -EINVAL;
1047 break;
1048 }
1049
1050 /* check for special events */
1051 if (event.type == SNDRV_SEQ_EVENT_NONE)
1052 goto __skip_event;
1053 else if (snd_seq_ev_is_reserved(&event)) {
1054 err = -EINVAL;
1055 break;
1056 }
1057
1058 if (snd_seq_ev_is_variable(&event)) {
1059 int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK;
1060 if ((size_t)(extlen + len) > count) {
1061 /* back out, will get an error this time or next */
1062 err = -EINVAL;
1063 break;
1064 }
1065 /* set user space pointer */
1066 event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
1067 event.data.ext.ptr = (char __force *)buf
1068 + sizeof(struct snd_seq_event);
1069 len += extlen; /* increment data length */
1070 } else {
1071 #ifdef CONFIG_COMPAT
1072 if (client->convert32 && snd_seq_ev_is_varusr(&event)) {
1073 void *ptr = (void __force *)compat_ptr(event.data.raw32.d[1]);
1074 event.data.ext.ptr = ptr;
1075 }
1076 #endif
1077 }
1078
1079 /* ok, enqueue it */
1080 err = snd_seq_client_enqueue_event(client, &event, file,
1081 !(file->f_flags & O_NONBLOCK),
1082 0, 0);
1083 if (err < 0)
1084 break;
1085
1086 __skip_event:
1087 /* Update pointers and counts */
1088 count -= len;
1089 buf += len;
1090 written += len;
1091 }
1092
1093 return written ? written : err;
1094 }
1095
1096
1097 /*
1098 * handle polling
1099 */
1100 static unsigned int snd_seq_poll(struct file *file, poll_table * wait)
1101 {
1102 struct snd_seq_client *client = file->private_data;
1103 unsigned int mask = 0;
1104
1105 /* check client structures are in place */
1106 if (snd_BUG_ON(!client))
1107 return -ENXIO;
1108
1109 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1110 client->data.user.fifo) {
1111
1112 /* check if data is available in the outqueue */
1113 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
1114 mask |= POLLIN | POLLRDNORM;
1115 }
1116
1117 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1118
1119 /* check if data is available in the pool */
1120 if (!snd_seq_write_pool_allocated(client) ||
1121 snd_seq_pool_poll_wait(client->pool, file, wait))
1122 mask |= POLLOUT | POLLWRNORM;
1123 }
1124
1125 return mask;
1126 }
1127
1128
1129 /*-----------------------------------------------------*/
1130
1131
1132 /* SYSTEM_INFO ioctl() */
1133 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void __user *arg)
1134 {
1135 struct snd_seq_system_info info;
1136
1137 memset(&info, 0, sizeof(info));
1138 /* fill the info fields */
1139 info.queues = SNDRV_SEQ_MAX_QUEUES;
1140 info.clients = SNDRV_SEQ_MAX_CLIENTS;
1141 info.ports = SNDRV_SEQ_MAX_PORTS;
1142 info.channels = 256; /* fixed limit */
1143 info.cur_clients = client_usage.cur;
1144 info.cur_queues = snd_seq_queue_get_cur_queues();
1145
1146 if (copy_to_user(arg, &info, sizeof(info)))
1147 return -EFAULT;
1148 return 0;
1149 }
1150
1151
1152 /* RUNNING_MODE ioctl() */
1153 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void __user *arg)
1154 {
1155 struct snd_seq_running_info info;
1156 struct snd_seq_client *cptr;
1157 int err = 0;
1158
1159 if (copy_from_user(&info, arg, sizeof(info)))
1160 return -EFAULT;
1161
1162 /* requested client number */
1163 cptr = snd_seq_client_use_ptr(info.client);
1164 if (cptr == NULL)
1165 return -ENOENT; /* don't change !!! */
1166
1167 #ifdef SNDRV_BIG_ENDIAN
1168 if (! info.big_endian) {
1169 err = -EINVAL;
1170 goto __err;
1171 }
1172 #else
1173 if (info.big_endian) {
1174 err = -EINVAL;
1175 goto __err;
1176 }
1177
1178 #endif
1179 if (info.cpu_mode > sizeof(long)) {
1180 err = -EINVAL;
1181 goto __err;
1182 }
1183 cptr->convert32 = (info.cpu_mode < sizeof(long));
1184 __err:
1185 snd_seq_client_unlock(cptr);
1186 return err;
1187 }
1188
1189 /* CLIENT_INFO ioctl() */
1190 static void get_client_info(struct snd_seq_client *cptr,
1191 struct snd_seq_client_info *info)
1192 {
1193 info->client = cptr->number;
1194
1195 /* fill the info fields */
1196 info->type = cptr->type;
1197 strcpy(info->name, cptr->name);
1198 info->filter = cptr->filter;
1199 info->event_lost = cptr->event_lost;
1200 memcpy(info->event_filter, cptr->event_filter, 32);
1201 info->num_ports = cptr->num_ports;
1202
1203 if (cptr->type == USER_CLIENT)
1204 info->pid = pid_vnr(cptr->data.user.owner);
1205 else
1206 info->pid = -1;
1207
1208 if (cptr->type == KERNEL_CLIENT)
1209 info->card = cptr->data.kernel.card ? cptr->data.kernel.card->number : -1;
1210 else
1211 info->card = -1;
1212
1213 memset(info->reserved, 0, sizeof(info->reserved));
1214 }
1215
1216 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
1217 void __user *arg)
1218 {
1219 struct snd_seq_client *cptr;
1220 struct snd_seq_client_info client_info;
1221
1222 if (copy_from_user(&client_info, arg, sizeof(client_info)))
1223 return -EFAULT;
1224
1225 /* requested client number */
1226 cptr = snd_seq_client_use_ptr(client_info.client);
1227 if (cptr == NULL)
1228 return -ENOENT; /* don't change !!! */
1229
1230 get_client_info(cptr, &client_info);
1231 snd_seq_client_unlock(cptr);
1232
1233 if (copy_to_user(arg, &client_info, sizeof(client_info)))
1234 return -EFAULT;
1235 return 0;
1236 }
1237
1238
1239 /* CLIENT_INFO ioctl() */
1240 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
1241 void __user *arg)
1242 {
1243 struct snd_seq_client_info client_info;
1244
1245 if (copy_from_user(&client_info, arg, sizeof(client_info)))
1246 return -EFAULT;
1247
1248 /* it is not allowed to set the info fields for an another client */
1249 if (client->number != client_info.client)
1250 return -EPERM;
1251 /* also client type must be set now */
1252 if (client->type != client_info.type)
1253 return -EINVAL;
1254
1255 /* fill the info fields */
1256 if (client_info.name[0])
1257 strlcpy(client->name, client_info.name, sizeof(client->name));
1258
1259 client->filter = client_info.filter;
1260 client->event_lost = client_info.event_lost;
1261 memcpy(client->event_filter, client_info.event_filter, 32);
1262
1263 return 0;
1264 }
1265
1266
1267 /*
1268 * CREATE PORT ioctl()
1269 */
1270 static int snd_seq_ioctl_create_port(struct snd_seq_client *client,
1271 void __user *arg)
1272 {
1273 struct snd_seq_client_port *port;
1274 struct snd_seq_port_info info;
1275 struct snd_seq_port_callback *callback;
1276
1277 if (copy_from_user(&info, arg, sizeof(info)))
1278 return -EFAULT;
1279
1280 /* it is not allowed to create the port for an another client */
1281 if (info.addr.client != client->number)
1282 return -EPERM;
1283
1284 port = snd_seq_create_port(client, (info.flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info.addr.port : -1);
1285 if (port == NULL)
1286 return -ENOMEM;
1287
1288 if (client->type == USER_CLIENT && info.kernel) {
1289 snd_seq_delete_port(client, port->addr.port);
1290 return -EINVAL;
1291 }
1292 if (client->type == KERNEL_CLIENT) {
1293 if ((callback = info.kernel) != NULL) {
1294 if (callback->owner)
1295 port->owner = callback->owner;
1296 port->private_data = callback->private_data;
1297 port->private_free = callback->private_free;
1298 port->event_input = callback->event_input;
1299 port->c_src.open = callback->subscribe;
1300 port->c_src.close = callback->unsubscribe;
1301 port->c_dest.open = callback->use;
1302 port->c_dest.close = callback->unuse;
1303 }
1304 }
1305
1306 info.addr = port->addr;
1307
1308 snd_seq_set_port_info(port, &info);
1309 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1310
1311 if (copy_to_user(arg, &info, sizeof(info)))
1312 return -EFAULT;
1313
1314 return 0;
1315 }
1316
1317 /*
1318 * DELETE PORT ioctl()
1319 */
1320 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client,
1321 void __user *arg)
1322 {
1323 struct snd_seq_port_info info;
1324 int err;
1325
1326 /* set passed parameters */
1327 if (copy_from_user(&info, arg, sizeof(info)))
1328 return -EFAULT;
1329
1330 /* it is not allowed to remove the port for an another client */
1331 if (info.addr.client != client->number)
1332 return -EPERM;
1333
1334 err = snd_seq_delete_port(client, info.addr.port);
1335 if (err >= 0)
1336 snd_seq_system_client_ev_port_exit(client->number, info.addr.port);
1337 return err;
1338 }
1339
1340
1341 /*
1342 * GET_PORT_INFO ioctl() (on any client)
1343 */
1344 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client,
1345 void __user *arg)
1346 {
1347 struct snd_seq_client *cptr;
1348 struct snd_seq_client_port *port;
1349 struct snd_seq_port_info info;
1350
1351 if (copy_from_user(&info, arg, sizeof(info)))
1352 return -EFAULT;
1353 cptr = snd_seq_client_use_ptr(info.addr.client);
1354 if (cptr == NULL)
1355 return -ENXIO;
1356
1357 port = snd_seq_port_use_ptr(cptr, info.addr.port);
1358 if (port == NULL) {
1359 snd_seq_client_unlock(cptr);
1360 return -ENOENT; /* don't change */
1361 }
1362
1363 /* get port info */
1364 snd_seq_get_port_info(port, &info);
1365 snd_seq_port_unlock(port);
1366 snd_seq_client_unlock(cptr);
1367
1368 if (copy_to_user(arg, &info, sizeof(info)))
1369 return -EFAULT;
1370 return 0;
1371 }
1372
1373
1374 /*
1375 * SET_PORT_INFO ioctl() (only ports on this/own client)
1376 */
1377 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client,
1378 void __user *arg)
1379 {
1380 struct snd_seq_client_port *port;
1381 struct snd_seq_port_info info;
1382
1383 if (copy_from_user(&info, arg, sizeof(info)))
1384 return -EFAULT;
1385
1386 if (info.addr.client != client->number) /* only set our own ports ! */
1387 return -EPERM;
1388 port = snd_seq_port_use_ptr(client, info.addr.port);
1389 if (port) {
1390 snd_seq_set_port_info(port, &info);
1391 snd_seq_port_unlock(port);
1392 }
1393 return 0;
1394 }
1395
1396
1397 /*
1398 * port subscription (connection)
1399 */
1400 #define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1401 #define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1402
1403 static int check_subscription_permission(struct snd_seq_client *client,
1404 struct snd_seq_client_port *sport,
1405 struct snd_seq_client_port *dport,
1406 struct snd_seq_port_subscribe *subs)
1407 {
1408 if (client->number != subs->sender.client &&
1409 client->number != subs->dest.client) {
1410 /* connection by third client - check export permission */
1411 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1412 return -EPERM;
1413 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1414 return -EPERM;
1415 }
1416
1417 /* check read permission */
1418 /* if sender or receiver is the subscribing client itself,
1419 * no permission check is necessary
1420 */
1421 if (client->number != subs->sender.client) {
1422 if (! check_port_perm(sport, PERM_RD))
1423 return -EPERM;
1424 }
1425 /* check write permission */
1426 if (client->number != subs->dest.client) {
1427 if (! check_port_perm(dport, PERM_WR))
1428 return -EPERM;
1429 }
1430 return 0;
1431 }
1432
1433 /*
1434 * send an subscription notify event to user client:
1435 * client must be user client.
1436 */
1437 int snd_seq_client_notify_subscription(int client, int port,
1438 struct snd_seq_port_subscribe *info,
1439 int evtype)
1440 {
1441 struct snd_seq_event event;
1442
1443 memset(&event, 0, sizeof(event));
1444 event.type = evtype;
1445 event.data.connect.dest = info->dest;
1446 event.data.connect.sender = info->sender;
1447
1448 return snd_seq_system_notify(client, port, &event); /* non-atomic */
1449 }
1450
1451
1452 /*
1453 * add to port's subscription list IOCTL interface
1454 */
1455 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
1456 void __user *arg)
1457 {
1458 int result = -EINVAL;
1459 struct snd_seq_client *receiver = NULL, *sender = NULL;
1460 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1461 struct snd_seq_port_subscribe subs;
1462
1463 if (copy_from_user(&subs, arg, sizeof(subs)))
1464 return -EFAULT;
1465
1466 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1467 goto __end;
1468 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1469 goto __end;
1470 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1471 goto __end;
1472 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1473 goto __end;
1474
1475 result = check_subscription_permission(client, sport, dport, &subs);
1476 if (result < 0)
1477 goto __end;
1478
1479 /* connect them */
1480 result = snd_seq_port_connect(client, sender, sport, receiver, dport, &subs);
1481 if (! result) /* broadcast announce */
1482 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1483 &subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1484 __end:
1485 if (sport)
1486 snd_seq_port_unlock(sport);
1487 if (dport)
1488 snd_seq_port_unlock(dport);
1489 if (sender)
1490 snd_seq_client_unlock(sender);
1491 if (receiver)
1492 snd_seq_client_unlock(receiver);
1493 return result;
1494 }
1495
1496
1497 /*
1498 * remove from port's subscription list
1499 */
1500 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
1501 void __user *arg)
1502 {
1503 int result = -ENXIO;
1504 struct snd_seq_client *receiver = NULL, *sender = NULL;
1505 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1506 struct snd_seq_port_subscribe subs;
1507
1508 if (copy_from_user(&subs, arg, sizeof(subs)))
1509 return -EFAULT;
1510
1511 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1512 goto __end;
1513 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1514 goto __end;
1515 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1516 goto __end;
1517 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1518 goto __end;
1519
1520 result = check_subscription_permission(client, sport, dport, &subs);
1521 if (result < 0)
1522 goto __end;
1523
1524 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, &subs);
1525 if (! result) /* broadcast announce */
1526 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1527 &subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1528 __end:
1529 if (sport)
1530 snd_seq_port_unlock(sport);
1531 if (dport)
1532 snd_seq_port_unlock(dport);
1533 if (sender)
1534 snd_seq_client_unlock(sender);
1535 if (receiver)
1536 snd_seq_client_unlock(receiver);
1537 return result;
1538 }
1539
1540
1541 /* CREATE_QUEUE ioctl() */
1542 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client,
1543 void __user *arg)
1544 {
1545 struct snd_seq_queue_info info;
1546 int result;
1547 struct snd_seq_queue *q;
1548
1549 if (copy_from_user(&info, arg, sizeof(info)))
1550 return -EFAULT;
1551
1552 result = snd_seq_queue_alloc(client->number, info.locked, info.flags);
1553 if (result < 0)
1554 return result;
1555
1556 q = queueptr(result);
1557 if (q == NULL)
1558 return -EINVAL;
1559
1560 info.queue = q->queue;
1561 info.locked = q->locked;
1562 info.owner = q->owner;
1563
1564 /* set queue name */
1565 if (! info.name[0])
1566 snprintf(info.name, sizeof(info.name), "Queue-%d", q->queue);
1567 strlcpy(q->name, info.name, sizeof(q->name));
1568 queuefree(q);
1569
1570 if (copy_to_user(arg, &info, sizeof(info)))
1571 return -EFAULT;
1572
1573 return 0;
1574 }
1575
1576 /* DELETE_QUEUE ioctl() */
1577 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client,
1578 void __user *arg)
1579 {
1580 struct snd_seq_queue_info info;
1581
1582 if (copy_from_user(&info, arg, sizeof(info)))
1583 return -EFAULT;
1584
1585 return snd_seq_queue_delete(client->number, info.queue);
1586 }
1587
1588 /* GET_QUEUE_INFO ioctl() */
1589 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client,
1590 void __user *arg)
1591 {
1592 struct snd_seq_queue_info info;
1593 struct snd_seq_queue *q;
1594
1595 if (copy_from_user(&info, arg, sizeof(info)))
1596 return -EFAULT;
1597
1598 q = queueptr(info.queue);
1599 if (q == NULL)
1600 return -EINVAL;
1601
1602 memset(&info, 0, sizeof(info));
1603 info.queue = q->queue;
1604 info.owner = q->owner;
1605 info.locked = q->locked;
1606 strlcpy(info.name, q->name, sizeof(info.name));
1607 queuefree(q);
1608
1609 if (copy_to_user(arg, &info, sizeof(info)))
1610 return -EFAULT;
1611
1612 return 0;
1613 }
1614
1615 /* SET_QUEUE_INFO ioctl() */
1616 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
1617 void __user *arg)
1618 {
1619 struct snd_seq_queue_info info;
1620 struct snd_seq_queue *q;
1621
1622 if (copy_from_user(&info, arg, sizeof(info)))
1623 return -EFAULT;
1624
1625 if (info.owner != client->number)
1626 return -EINVAL;
1627
1628 /* change owner/locked permission */
1629 if (snd_seq_queue_check_access(info.queue, client->number)) {
1630 if (snd_seq_queue_set_owner(info.queue, client->number, info.locked) < 0)
1631 return -EPERM;
1632 if (info.locked)
1633 snd_seq_queue_use(info.queue, client->number, 1);
1634 } else {
1635 return -EPERM;
1636 }
1637
1638 q = queueptr(info.queue);
1639 if (! q)
1640 return -EINVAL;
1641 if (q->owner != client->number) {
1642 queuefree(q);
1643 return -EPERM;
1644 }
1645 strlcpy(q->name, info.name, sizeof(q->name));
1646 queuefree(q);
1647
1648 return 0;
1649 }
1650
1651 /* GET_NAMED_QUEUE ioctl() */
1652 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client, void __user *arg)
1653 {
1654 struct snd_seq_queue_info info;
1655 struct snd_seq_queue *q;
1656
1657 if (copy_from_user(&info, arg, sizeof(info)))
1658 return -EFAULT;
1659
1660 q = snd_seq_queue_find_name(info.name);
1661 if (q == NULL)
1662 return -EINVAL;
1663 info.queue = q->queue;
1664 info.owner = q->owner;
1665 info.locked = q->locked;
1666 queuefree(q);
1667
1668 if (copy_to_user(arg, &info, sizeof(info)))
1669 return -EFAULT;
1670
1671 return 0;
1672 }
1673
1674 /* GET_QUEUE_STATUS ioctl() */
1675 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
1676 void __user *arg)
1677 {
1678 struct snd_seq_queue_status status;
1679 struct snd_seq_queue *queue;
1680 struct snd_seq_timer *tmr;
1681
1682 if (copy_from_user(&status, arg, sizeof(status)))
1683 return -EFAULT;
1684
1685 queue = queueptr(status.queue);
1686 if (queue == NULL)
1687 return -EINVAL;
1688 memset(&status, 0, sizeof(status));
1689 status.queue = queue->queue;
1690
1691 tmr = queue->timer;
1692 status.events = queue->tickq->cells + queue->timeq->cells;
1693
1694 status.time = snd_seq_timer_get_cur_time(tmr);
1695 status.tick = snd_seq_timer_get_cur_tick(tmr);
1696
1697 status.running = tmr->running;
1698
1699 status.flags = queue->flags;
1700 queuefree(queue);
1701
1702 if (copy_to_user(arg, &status, sizeof(status)))
1703 return -EFAULT;
1704 return 0;
1705 }
1706
1707
1708 /* GET_QUEUE_TEMPO ioctl() */
1709 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
1710 void __user *arg)
1711 {
1712 struct snd_seq_queue_tempo tempo;
1713 struct snd_seq_queue *queue;
1714 struct snd_seq_timer *tmr;
1715
1716 if (copy_from_user(&tempo, arg, sizeof(tempo)))
1717 return -EFAULT;
1718
1719 queue = queueptr(tempo.queue);
1720 if (queue == NULL)
1721 return -EINVAL;
1722 memset(&tempo, 0, sizeof(tempo));
1723 tempo.queue = queue->queue;
1724
1725 tmr = queue->timer;
1726
1727 tempo.tempo = tmr->tempo;
1728 tempo.ppq = tmr->ppq;
1729 tempo.skew_value = tmr->skew;
1730 tempo.skew_base = tmr->skew_base;
1731 queuefree(queue);
1732
1733 if (copy_to_user(arg, &tempo, sizeof(tempo)))
1734 return -EFAULT;
1735 return 0;
1736 }
1737
1738
1739 /* SET_QUEUE_TEMPO ioctl() */
1740 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1741 {
1742 if (!snd_seq_queue_check_access(tempo->queue, client))
1743 return -EPERM;
1744 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1745 }
1746
1747 EXPORT_SYMBOL(snd_seq_set_queue_tempo);
1748
1749 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
1750 void __user *arg)
1751 {
1752 int result;
1753 struct snd_seq_queue_tempo tempo;
1754
1755 if (copy_from_user(&tempo, arg, sizeof(tempo)))
1756 return -EFAULT;
1757
1758 result = snd_seq_set_queue_tempo(client->number, &tempo);
1759 return result < 0 ? result : 0;
1760 }
1761
1762
1763 /* GET_QUEUE_TIMER ioctl() */
1764 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
1765 void __user *arg)
1766 {
1767 struct snd_seq_queue_timer timer;
1768 struct snd_seq_queue *queue;
1769 struct snd_seq_timer *tmr;
1770
1771 if (copy_from_user(&timer, arg, sizeof(timer)))
1772 return -EFAULT;
1773
1774 queue = queueptr(timer.queue);
1775 if (queue == NULL)
1776 return -EINVAL;
1777
1778 if (mutex_lock_interruptible(&queue->timer_mutex)) {
1779 queuefree(queue);
1780 return -ERESTARTSYS;
1781 }
1782 tmr = queue->timer;
1783 memset(&timer, 0, sizeof(timer));
1784 timer.queue = queue->queue;
1785
1786 timer.type = tmr->type;
1787 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1788 timer.u.alsa.id = tmr->alsa_id;
1789 timer.u.alsa.resolution = tmr->preferred_resolution;
1790 }
1791 mutex_unlock(&queue->timer_mutex);
1792 queuefree(queue);
1793
1794 if (copy_to_user(arg, &timer, sizeof(timer)))
1795 return -EFAULT;
1796 return 0;
1797 }
1798
1799
1800 /* SET_QUEUE_TIMER ioctl() */
1801 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
1802 void __user *arg)
1803 {
1804 int result = 0;
1805 struct snd_seq_queue_timer timer;
1806
1807 if (copy_from_user(&timer, arg, sizeof(timer)))
1808 return -EFAULT;
1809
1810 if (timer.type != SNDRV_SEQ_TIMER_ALSA)
1811 return -EINVAL;
1812
1813 if (snd_seq_queue_check_access(timer.queue, client->number)) {
1814 struct snd_seq_queue *q;
1815 struct snd_seq_timer *tmr;
1816
1817 q = queueptr(timer.queue);
1818 if (q == NULL)
1819 return -ENXIO;
1820 if (mutex_lock_interruptible(&q->timer_mutex)) {
1821 queuefree(q);
1822 return -ERESTARTSYS;
1823 }
1824 tmr = q->timer;
1825 snd_seq_queue_timer_close(timer.queue);
1826 tmr->type = timer.type;
1827 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1828 tmr->alsa_id = timer.u.alsa.id;
1829 tmr->preferred_resolution = timer.u.alsa.resolution;
1830 }
1831 result = snd_seq_queue_timer_open(timer.queue);
1832 mutex_unlock(&q->timer_mutex);
1833 queuefree(q);
1834 } else {
1835 return -EPERM;
1836 }
1837
1838 return result;
1839 }
1840
1841
1842 /* GET_QUEUE_CLIENT ioctl() */
1843 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
1844 void __user *arg)
1845 {
1846 struct snd_seq_queue_client info;
1847 int used;
1848
1849 if (copy_from_user(&info, arg, sizeof(info)))
1850 return -EFAULT;
1851
1852 used = snd_seq_queue_is_used(info.queue, client->number);
1853 if (used < 0)
1854 return -EINVAL;
1855 info.used = used;
1856 info.client = client->number;
1857
1858 if (copy_to_user(arg, &info, sizeof(info)))
1859 return -EFAULT;
1860 return 0;
1861 }
1862
1863
1864 /* SET_QUEUE_CLIENT ioctl() */
1865 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
1866 void __user *arg)
1867 {
1868 int err;
1869 struct snd_seq_queue_client info;
1870
1871 if (copy_from_user(&info, arg, sizeof(info)))
1872 return -EFAULT;
1873
1874 if (info.used >= 0) {
1875 err = snd_seq_queue_use(info.queue, client->number, info.used);
1876 if (err < 0)
1877 return err;
1878 }
1879
1880 return snd_seq_ioctl_get_queue_client(client, arg);
1881 }
1882
1883
1884 /* GET_CLIENT_POOL ioctl() */
1885 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
1886 void __user *arg)
1887 {
1888 struct snd_seq_client_pool info;
1889 struct snd_seq_client *cptr;
1890
1891 if (copy_from_user(&info, arg, sizeof(info)))
1892 return -EFAULT;
1893
1894 cptr = snd_seq_client_use_ptr(info.client);
1895 if (cptr == NULL)
1896 return -ENOENT;
1897 memset(&info, 0, sizeof(info));
1898 info.client = cptr->number;
1899 info.output_pool = cptr->pool->size;
1900 info.output_room = cptr->pool->room;
1901 info.output_free = info.output_pool;
1902 info.output_free = snd_seq_unused_cells(cptr->pool);
1903 if (cptr->type == USER_CLIENT) {
1904 info.input_pool = cptr->data.user.fifo_pool_size;
1905 info.input_free = info.input_pool;
1906 if (cptr->data.user.fifo)
1907 info.input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool);
1908 } else {
1909 info.input_pool = 0;
1910 info.input_free = 0;
1911 }
1912 snd_seq_client_unlock(cptr);
1913
1914 if (copy_to_user(arg, &info, sizeof(info)))
1915 return -EFAULT;
1916 return 0;
1917 }
1918
1919 /* SET_CLIENT_POOL ioctl() */
1920 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
1921 void __user *arg)
1922 {
1923 struct snd_seq_client_pool info;
1924 int rc;
1925
1926 if (copy_from_user(&info, arg, sizeof(info)))
1927 return -EFAULT;
1928
1929 if (client->number != info.client)
1930 return -EINVAL; /* can't change other clients */
1931
1932 if (info.output_pool >= 1 && info.output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1933 (! snd_seq_write_pool_allocated(client) ||
1934 info.output_pool != client->pool->size)) {
1935 if (snd_seq_write_pool_allocated(client)) {
1936 /* remove all existing cells */
1937 snd_seq_queue_client_leave_cells(client->number);
1938 snd_seq_pool_done(client->pool);
1939 }
1940 client->pool->size = info.output_pool;
1941 rc = snd_seq_pool_init(client->pool);
1942 if (rc < 0)
1943 return rc;
1944 }
1945 if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
1946 info.input_pool >= 1 &&
1947 info.input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1948 info.input_pool != client->data.user.fifo_pool_size) {
1949 /* change pool size */
1950 rc = snd_seq_fifo_resize(client->data.user.fifo, info.input_pool);
1951 if (rc < 0)
1952 return rc;
1953 client->data.user.fifo_pool_size = info.input_pool;
1954 }
1955 if (info.output_room >= 1 &&
1956 info.output_room <= client->pool->size) {
1957 client->pool->room = info.output_room;
1958 }
1959
1960 return snd_seq_ioctl_get_client_pool(client, arg);
1961 }
1962
1963
1964 /* REMOVE_EVENTS ioctl() */
1965 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
1966 void __user *arg)
1967 {
1968 struct snd_seq_remove_events info;
1969
1970 if (copy_from_user(&info, arg, sizeof(info)))
1971 return -EFAULT;
1972
1973 /*
1974 * Input mostly not implemented XXX.
1975 */
1976 if (info.remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1977 /*
1978 * No restrictions so for a user client we can clear
1979 * the whole fifo
1980 */
1981 if (client->type == USER_CLIENT && client->data.user.fifo)
1982 snd_seq_fifo_clear(client->data.user.fifo);
1983 }
1984
1985 if (info.remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1986 snd_seq_queue_remove_cells(client->number, &info);
1987
1988 return 0;
1989 }
1990
1991
1992 /*
1993 * get subscription info
1994 */
1995 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
1996 void __user *arg)
1997 {
1998 int result;
1999 struct snd_seq_client *sender = NULL;
2000 struct snd_seq_client_port *sport = NULL;
2001 struct snd_seq_port_subscribe subs;
2002 struct snd_seq_subscribers *p;
2003
2004 if (copy_from_user(&subs, arg, sizeof(subs)))
2005 return -EFAULT;
2006
2007 result = -EINVAL;
2008 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
2009 goto __end;
2010 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
2011 goto __end;
2012 p = snd_seq_port_get_subscription(&sport->c_src, &subs.dest);
2013 if (p) {
2014 result = 0;
2015 subs = p->info;
2016 } else
2017 result = -ENOENT;
2018
2019 __end:
2020 if (sport)
2021 snd_seq_port_unlock(sport);
2022 if (sender)
2023 snd_seq_client_unlock(sender);
2024 if (result >= 0) {
2025 if (copy_to_user(arg, &subs, sizeof(subs)))
2026 return -EFAULT;
2027 }
2028 return result;
2029 }
2030
2031
2032 /*
2033 * get subscription info - check only its presence
2034 */
2035 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client,
2036 void __user *arg)
2037 {
2038 int result = -ENXIO;
2039 struct snd_seq_client *cptr = NULL;
2040 struct snd_seq_client_port *port = NULL;
2041 struct snd_seq_query_subs subs;
2042 struct snd_seq_port_subs_info *group;
2043 struct list_head *p;
2044 int i;
2045
2046 if (copy_from_user(&subs, arg, sizeof(subs)))
2047 return -EFAULT;
2048
2049 if ((cptr = snd_seq_client_use_ptr(subs.root.client)) == NULL)
2050 goto __end;
2051 if ((port = snd_seq_port_use_ptr(cptr, subs.root.port)) == NULL)
2052 goto __end;
2053
2054 switch (subs.type) {
2055 case SNDRV_SEQ_QUERY_SUBS_READ:
2056 group = &port->c_src;
2057 break;
2058 case SNDRV_SEQ_QUERY_SUBS_WRITE:
2059 group = &port->c_dest;
2060 break;
2061 default:
2062 goto __end;
2063 }
2064
2065 down_read(&group->list_mutex);
2066 /* search for the subscriber */
2067 subs.num_subs = group->count;
2068 i = 0;
2069 result = -ENOENT;
2070 list_for_each(p, &group->list_head) {
2071 if (i++ == subs.index) {
2072 /* found! */
2073 struct snd_seq_subscribers *s;
2074 if (subs.type == SNDRV_SEQ_QUERY_SUBS_READ) {
2075 s = list_entry(p, struct snd_seq_subscribers, src_list);
2076 subs.addr = s->info.dest;
2077 } else {
2078 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2079 subs.addr = s->info.sender;
2080 }
2081 subs.flags = s->info.flags;
2082 subs.queue = s->info.queue;
2083 result = 0;
2084 break;
2085 }
2086 }
2087 up_read(&group->list_mutex);
2088
2089 __end:
2090 if (port)
2091 snd_seq_port_unlock(port);
2092 if (cptr)
2093 snd_seq_client_unlock(cptr);
2094 if (result >= 0) {
2095 if (copy_to_user(arg, &subs, sizeof(subs)))
2096 return -EFAULT;
2097 }
2098 return result;
2099 }
2100
2101
2102 /*
2103 * query next client
2104 */
2105 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
2106 void __user *arg)
2107 {
2108 struct snd_seq_client *cptr = NULL;
2109 struct snd_seq_client_info info;
2110
2111 if (copy_from_user(&info, arg, sizeof(info)))
2112 return -EFAULT;
2113
2114 /* search for next client */
2115 info.client++;
2116 if (info.client < 0)
2117 info.client = 0;
2118 for (; info.client < SNDRV_SEQ_MAX_CLIENTS; info.client++) {
2119 cptr = snd_seq_client_use_ptr(info.client);
2120 if (cptr)
2121 break; /* found */
2122 }
2123 if (cptr == NULL)
2124 return -ENOENT;
2125
2126 get_client_info(cptr, &info);
2127 snd_seq_client_unlock(cptr);
2128
2129 if (copy_to_user(arg, &info, sizeof(info)))
2130 return -EFAULT;
2131 return 0;
2132 }
2133
2134 /*
2135 * query next port
2136 */
2137 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
2138 void __user *arg)
2139 {
2140 struct snd_seq_client *cptr;
2141 struct snd_seq_client_port *port = NULL;
2142 struct snd_seq_port_info info;
2143
2144 if (copy_from_user(&info, arg, sizeof(info)))
2145 return -EFAULT;
2146 cptr = snd_seq_client_use_ptr(info.addr.client);
2147 if (cptr == NULL)
2148 return -ENXIO;
2149
2150 /* search for next port */
2151 info.addr.port++;
2152 port = snd_seq_port_query_nearest(cptr, &info);
2153 if (port == NULL) {
2154 snd_seq_client_unlock(cptr);
2155 return -ENOENT;
2156 }
2157
2158 /* get port info */
2159 info.addr = port->addr;
2160 snd_seq_get_port_info(port, &info);
2161 snd_seq_port_unlock(port);
2162 snd_seq_client_unlock(cptr);
2163
2164 if (copy_to_user(arg, &info, sizeof(info)))
2165 return -EFAULT;
2166 return 0;
2167 }
2168
2169 /* -------------------------------------------------------- */
2170
2171 static struct seq_ioctl_table {
2172 unsigned int cmd;
2173 int (*func)(struct snd_seq_client *client, void __user * arg);
2174 } ioctl_tables[] = {
2175 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2176 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2177 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2178 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2179 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2180 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2181 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2182 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2183 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2184 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2185 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2186 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2187 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2188 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2189 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2190 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2191 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2192 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2193 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2194 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2195 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2196 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2197 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2198 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2199 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2200 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2201 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2202 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2203 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2204 { 0, NULL },
2205 };
2206
2207 static int snd_seq_do_ioctl(struct snd_seq_client *client, unsigned int cmd,
2208 void __user *arg)
2209 {
2210 struct seq_ioctl_table *p;
2211
2212 switch (cmd) {
2213 case SNDRV_SEQ_IOCTL_PVERSION:
2214 /* return sequencer version number */
2215 return put_user(SNDRV_SEQ_VERSION, (int __user *)arg) ? -EFAULT : 0;
2216 case SNDRV_SEQ_IOCTL_CLIENT_ID:
2217 /* return the id of this client */
2218 return put_user(client->number, (int __user *)arg) ? -EFAULT : 0;
2219 }
2220
2221 if (! arg)
2222 return -EFAULT;
2223 for (p = ioctl_tables; p->cmd; p++) {
2224 if (p->cmd == cmd)
2225 return p->func(client, arg);
2226 }
2227 pr_debug("ALSA: seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n",
2228 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2229 return -ENOTTY;
2230 }
2231
2232
2233 static long snd_seq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2234 {
2235 struct snd_seq_client *client = file->private_data;
2236
2237 if (snd_BUG_ON(!client))
2238 return -ENXIO;
2239
2240 return snd_seq_do_ioctl(client, cmd, (void __user *) arg);
2241 }
2242
2243 #ifdef CONFIG_COMPAT
2244 #include "seq_compat.c"
2245 #else
2246 #define snd_seq_ioctl_compat NULL
2247 #endif
2248
2249 /* -------------------------------------------------------- */
2250
2251
2252 /* exported to kernel modules */
2253 int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
2254 const char *name_fmt, ...)
2255 {
2256 struct snd_seq_client *client;
2257 va_list args;
2258
2259 if (snd_BUG_ON(in_interrupt()))
2260 return -EBUSY;
2261
2262 if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD)
2263 return -EINVAL;
2264 if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
2265 return -EINVAL;
2266
2267 if (mutex_lock_interruptible(&register_mutex))
2268 return -ERESTARTSYS;
2269
2270 if (card) {
2271 client_index += SNDRV_SEQ_GLOBAL_CLIENTS
2272 + card->number * SNDRV_SEQ_CLIENTS_PER_CARD;
2273 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN)
2274 client_index = -1;
2275 }
2276
2277 /* empty write queue as default */
2278 client = seq_create_client1(client_index, 0);
2279 if (client == NULL) {
2280 mutex_unlock(&register_mutex);
2281 return -EBUSY; /* failure code */
2282 }
2283 usage_alloc(&client_usage, 1);
2284
2285 client->accept_input = 1;
2286 client->accept_output = 1;
2287 client->data.kernel.card = card;
2288
2289 va_start(args, name_fmt);
2290 vsnprintf(client->name, sizeof(client->name), name_fmt, args);
2291 va_end(args);
2292
2293 client->type = KERNEL_CLIENT;
2294 mutex_unlock(&register_mutex);
2295
2296 /* make others aware this new client */
2297 snd_seq_system_client_ev_client_start(client->number);
2298
2299 /* return client number to caller */
2300 return client->number;
2301 }
2302
2303 EXPORT_SYMBOL(snd_seq_create_kernel_client);
2304
2305 /* exported to kernel modules */
2306 int snd_seq_delete_kernel_client(int client)
2307 {
2308 struct snd_seq_client *ptr;
2309
2310 if (snd_BUG_ON(in_interrupt()))
2311 return -EBUSY;
2312
2313 ptr = clientptr(client);
2314 if (ptr == NULL)
2315 return -EINVAL;
2316
2317 seq_free_client(ptr);
2318 kfree(ptr);
2319 return 0;
2320 }
2321
2322 EXPORT_SYMBOL(snd_seq_delete_kernel_client);
2323
2324 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue
2325 * and snd_seq_kernel_client_enqueue_blocking
2326 */
2327 static int kernel_client_enqueue(int client, struct snd_seq_event *ev,
2328 struct file *file, int blocking,
2329 int atomic, int hop)
2330 {
2331 struct snd_seq_client *cptr;
2332 int result;
2333
2334 if (snd_BUG_ON(!ev))
2335 return -EINVAL;
2336
2337 if (ev->type == SNDRV_SEQ_EVENT_NONE)
2338 return 0; /* ignore this */
2339 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2340 return -EINVAL; /* quoted events can't be enqueued */
2341
2342 /* fill in client number */
2343 ev->source.client = client;
2344
2345 if (check_event_type_and_length(ev))
2346 return -EINVAL;
2347
2348 cptr = snd_seq_client_use_ptr(client);
2349 if (cptr == NULL)
2350 return -EINVAL;
2351
2352 if (! cptr->accept_output)
2353 result = -EPERM;
2354 else /* send it */
2355 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, atomic, hop);
2356
2357 snd_seq_client_unlock(cptr);
2358 return result;
2359 }
2360
2361 /*
2362 * exported, called by kernel clients to enqueue events (w/o blocking)
2363 *
2364 * RETURN VALUE: zero if succeed, negative if error
2365 */
2366 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev,
2367 int atomic, int hop)
2368 {
2369 return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop);
2370 }
2371
2372 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
2373
2374 /*
2375 * exported, called by kernel clients to enqueue events (with blocking)
2376 *
2377 * RETURN VALUE: zero if succeed, negative if error
2378 */
2379 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev,
2380 struct file *file,
2381 int atomic, int hop)
2382 {
2383 return kernel_client_enqueue(client, ev, file, 1, atomic, hop);
2384 }
2385
2386 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking);
2387
2388 /*
2389 * exported, called by kernel clients to dispatch events directly to other
2390 * clients, bypassing the queues. Event time-stamp will be updated.
2391 *
2392 * RETURN VALUE: negative = delivery failed,
2393 * zero, or positive: the number of delivered events
2394 */
2395 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev,
2396 int atomic, int hop)
2397 {
2398 struct snd_seq_client *cptr;
2399 int result;
2400
2401 if (snd_BUG_ON(!ev))
2402 return -EINVAL;
2403
2404 /* fill in client number */
2405 ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2406 ev->source.client = client;
2407
2408 if (check_event_type_and_length(ev))
2409 return -EINVAL;
2410
2411 cptr = snd_seq_client_use_ptr(client);
2412 if (cptr == NULL)
2413 return -EINVAL;
2414
2415 if (!cptr->accept_output)
2416 result = -EPERM;
2417 else
2418 result = snd_seq_deliver_event(cptr, ev, atomic, hop);
2419
2420 snd_seq_client_unlock(cptr);
2421 return result;
2422 }
2423
2424 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch);
2425
2426 /*
2427 * exported, called by kernel clients to perform same functions as with
2428 * userland ioctl()
2429 */
2430 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2431 {
2432 struct snd_seq_client *client;
2433 mm_segment_t fs;
2434 int result;
2435
2436 client = clientptr(clientid);
2437 if (client == NULL)
2438 return -ENXIO;
2439 fs = snd_enter_user();
2440 result = snd_seq_do_ioctl(client, cmd, (void __force __user *)arg);
2441 snd_leave_user(fs);
2442 return result;
2443 }
2444
2445 EXPORT_SYMBOL(snd_seq_kernel_client_ctl);
2446
2447 /* exported (for OSS emulator) */
2448 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2449 {
2450 struct snd_seq_client *client;
2451
2452 client = clientptr(clientid);
2453 if (client == NULL)
2454 return -ENXIO;
2455
2456 if (! snd_seq_write_pool_allocated(client))
2457 return 1;
2458 if (snd_seq_pool_poll_wait(client->pool, file, wait))
2459 return 1;
2460 return 0;
2461 }
2462
2463 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll);
2464
2465 /*---------------------------------------------------------------------------*/
2466
2467 #ifdef CONFIG_SND_PROC_FS
2468 /*
2469 * /proc interface
2470 */
2471 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer,
2472 struct snd_seq_port_subs_info *group,
2473 int is_src, char *msg)
2474 {
2475 struct list_head *p;
2476 struct snd_seq_subscribers *s;
2477 int count = 0;
2478
2479 down_read(&group->list_mutex);
2480 if (list_empty(&group->list_head)) {
2481 up_read(&group->list_mutex);
2482 return;
2483 }
2484 snd_iprintf(buffer, msg);
2485 list_for_each(p, &group->list_head) {
2486 if (is_src)
2487 s = list_entry(p, struct snd_seq_subscribers, src_list);
2488 else
2489 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2490 if (count++)
2491 snd_iprintf(buffer, ", ");
2492 snd_iprintf(buffer, "%d:%d",
2493 is_src ? s->info.dest.client : s->info.sender.client,
2494 is_src ? s->info.dest.port : s->info.sender.port);
2495 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
2496 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
2497 if (group->exclusive)
2498 snd_iprintf(buffer, "[ex]");
2499 }
2500 up_read(&group->list_mutex);
2501 snd_iprintf(buffer, "\n");
2502 }
2503
2504 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
2505 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
2506 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
2507
2508 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2509
2510 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
2511 struct snd_seq_client *client)
2512 {
2513 struct snd_seq_client_port *p;
2514
2515 mutex_lock(&client->ports_mutex);
2516 list_for_each_entry(p, &client->ports_list_head, list) {
2517 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c)\n",
2518 p->addr.port, p->name,
2519 FLAG_PERM_RD(p->capability),
2520 FLAG_PERM_WR(p->capability),
2521 FLAG_PERM_EX(p->capability),
2522 FLAG_PERM_DUPLEX(p->capability));
2523 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: ");
2524 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: ");
2525 }
2526 mutex_unlock(&client->ports_mutex);
2527 }
2528
2529
2530 /* exported to seq_info.c */
2531 void snd_seq_info_clients_read(struct snd_info_entry *entry,
2532 struct snd_info_buffer *buffer)
2533 {
2534 int c;
2535 struct snd_seq_client *client;
2536
2537 snd_iprintf(buffer, "Client info\n");
2538 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur);
2539 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak);
2540 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
2541 snd_iprintf(buffer, "\n");
2542
2543 /* list the client table */
2544 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2545 client = snd_seq_client_use_ptr(c);
2546 if (client == NULL)
2547 continue;
2548 if (client->type == NO_CLIENT) {
2549 snd_seq_client_unlock(client);
2550 continue;
2551 }
2552
2553 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n",
2554 c, client->name,
2555 client->type == USER_CLIENT ? "User" : "Kernel");
2556 snd_seq_info_dump_ports(buffer, client);
2557 if (snd_seq_write_pool_allocated(client)) {
2558 snd_iprintf(buffer, " Output pool :\n");
2559 snd_seq_info_pool(buffer, client->pool, " ");
2560 }
2561 if (client->type == USER_CLIENT && client->data.user.fifo &&
2562 client->data.user.fifo->pool) {
2563 snd_iprintf(buffer, " Input pool :\n");
2564 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " ");
2565 }
2566 snd_seq_client_unlock(client);
2567 }
2568 }
2569 #endif /* CONFIG_SND_PROC_FS */
2570
2571 /*---------------------------------------------------------------------------*/
2572
2573
2574 /*
2575 * REGISTRATION PART
2576 */
2577
2578 static const struct file_operations snd_seq_f_ops =
2579 {
2580 .owner = THIS_MODULE,
2581 .read = snd_seq_read,
2582 .write = snd_seq_write,
2583 .open = snd_seq_open,
2584 .release = snd_seq_release,
2585 .llseek = no_llseek,
2586 .poll = snd_seq_poll,
2587 .unlocked_ioctl = snd_seq_ioctl,
2588 .compat_ioctl = snd_seq_ioctl_compat,
2589 };
2590
2591 static struct device seq_dev;
2592
2593 /*
2594 * register sequencer device
2595 */
2596 int __init snd_sequencer_device_init(void)
2597 {
2598 int err;
2599
2600 snd_device_initialize(&seq_dev, NULL);
2601 dev_set_name(&seq_dev, "seq");
2602
2603 if (mutex_lock_interruptible(&register_mutex))
2604 return -ERESTARTSYS;
2605
2606 err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
2607 &snd_seq_f_ops, NULL, &seq_dev);
2608 if (err < 0) {
2609 mutex_unlock(&register_mutex);
2610 put_device(&seq_dev);
2611 return err;
2612 }
2613
2614 mutex_unlock(&register_mutex);
2615
2616 return 0;
2617 }
2618
2619
2620
2621 /*
2622 * unregister sequencer device
2623 */
2624 void __exit snd_sequencer_device_done(void)
2625 {
2626 snd_unregister_device(&seq_dev);
2627 put_device(&seq_dev);
2628 }
Linux kernel - Deliverables
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