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>
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.
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.
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
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>
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"
36 #include "seq_system.h"
37 #include <sound/seq_device.h>
39 #include <linux/compat.h>
44 * this module handles the connections of userland and kernel clients
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
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
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)
67 static DEFINE_SPINLOCK(clients_lock);
68 static DEFINE_MUTEX(register_mutex);
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;
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);
90 static inline mm_segment_t snd_enter_user(void)
92 mm_segment_t fs = get_fs();
97 static inline void snd_leave_user(mm_segment_t fs)
104 static inline unsigned short snd_seq_file_flags(struct file *file)
106 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
108 return SNDRV_SEQ_LFLG_OUTPUT;
110 return SNDRV_SEQ_LFLG_INPUT;
112 return SNDRV_SEQ_LFLG_OPEN;
116 static inline int snd_seq_write_pool_allocated(struct snd_seq_client *client)
118 return snd_seq_total_cells(client->pool) > 0;
121 /* return pointer to client structure for specified id */
122 static struct snd_seq_client *clientptr(int clientid)
124 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
125 snd_printd("Seq: oops. Trying to get pointer to client %d\n",
129 return clienttab[clientid];
132 struct snd_seq_client *snd_seq_client_use_ptr(int clientid)
135 struct snd_seq_client *client;
137 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
138 snd_printd("Seq: oops. Trying to get pointer to client %d\n",
142 spin_lock_irqsave(&clients_lock, flags);
143 client = clientptr(clientid);
146 if (clienttablock[clientid]) {
147 spin_unlock_irqrestore(&clients_lock, flags);
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) {
158 if (!client_requested[clientid]) {
159 client_requested[clientid] = 1;
160 for (idx = 0; idx < 15; idx++) {
161 if (seq_client_load[idx] < 0)
163 if (seq_client_load[idx] == clientid) {
164 request_module("snd-seq-client-%i",
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);
178 snd_seq_device_load_drivers();
181 spin_lock_irqsave(&clients_lock, flags);
182 client = clientptr(clientid);
185 spin_unlock_irqrestore(&clients_lock, flags);
191 snd_use_lock_use(&client->use_lock);
192 spin_unlock_irqrestore(&clients_lock, flags);
196 static void usage_alloc(struct snd_seq_usage *res, int num)
199 if (res->cur > res->peak)
200 res->peak = res->cur;
203 static void usage_free(struct snd_seq_usage *res, int num)
208 /* initialise data structures */
209 int __init client_init_data(void)
211 /* zap out the client table */
212 memset(&clienttablock, 0, sizeof(clienttablock));
213 memset(&clienttab, 0, sizeof(clienttab));
218 static struct snd_seq_client *seq_create_client1(int client_index, int poolsize)
222 struct snd_seq_client *client;
224 /* init client data */
225 client = kzalloc(sizeof(*client), GFP_KERNEL);
228 client->pool = snd_seq_pool_new(poolsize);
229 if (client->pool == NULL) {
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);
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;
245 if (clienttab[c] || clienttablock[c])
247 clienttab[client->number = c] = client;
248 spin_unlock_irqrestore(&clients_lock, flags);
252 if (clienttab[client_index] == NULL && !clienttablock[client_index]) {
253 clienttab[client->number = client_index] = client;
254 spin_unlock_irqrestore(&clients_lock, flags);
258 spin_unlock_irqrestore(&clients_lock, flags);
259 snd_seq_pool_delete(&client->pool);
261 return NULL; /* no free slot found or busy, return failure code */
265 static int seq_free_client1(struct snd_seq_client *client)
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);
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);
288 static void seq_free_client(struct snd_seq_client * client)
290 mutex_lock(®ister_mutex);
291 switch (client->type) {
293 snd_printk(KERN_WARNING "Seq: Trying to free unused client %d\n",
298 seq_free_client1(client);
299 usage_free(&client_usage, 1);
303 snd_printk(KERN_ERR "Seq: Trying to free client %d with undefined type = %d\n",
304 client->number, client->type);
306 mutex_unlock(®ister_mutex);
308 snd_seq_system_client_ev_client_exit(client->number);
313 /* -------------------------------------------------------- */
315 /* create a user client */
316 static int snd_seq_open(struct inode *inode, struct file *file)
318 int c, mode; /* client id */
319 struct snd_seq_client *client;
320 struct snd_seq_user_client *user;
322 if (mutex_lock_interruptible(®ister_mutex))
324 client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS);
325 if (client == NULL) {
326 mutex_unlock(®ister_mutex);
327 return -ENOMEM; /* failure code */
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;
336 user = &client->data.user;
338 user->fifo_pool_size = 0;
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);
346 mutex_unlock(®ister_mutex);
351 usage_alloc(&client_usage, 1);
352 client->type = USER_CLIENT;
353 mutex_unlock(®ister_mutex);
356 file->private_data = client;
358 /* fill client data */
360 sprintf(client->name, "Client-%d", c);
362 /* make others aware this new client */
363 snd_seq_system_client_ev_client_start(c);
368 /* delete a user client */
369 static int snd_seq_release(struct inode *inode, struct file *file)
371 struct snd_seq_client *client = file->private_data;
374 seq_free_client(client);
375 if (client->data.user.fifo)
376 snd_seq_fifo_delete(&client->data.user.fifo);
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
391 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count,
394 struct snd_seq_client *client = file->private_data;
395 struct snd_seq_fifo *fifo;
398 struct snd_seq_event_cell *cell;
400 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT))
403 if (!access_ok(VERIFY_WRITE, buf, count))
406 /* check client structures are in place */
407 if (snd_BUG_ON(!client))
410 if (!client->accept_input || (fifo = client->data.user.fifo) == NULL)
413 if (atomic_read(&fifo->overflow) > 0) {
414 /* buffer overflow is detected */
415 snd_seq_fifo_clear(fifo);
416 /* return error code */
422 snd_seq_fifo_lock(fifo);
424 /* while data available in queue */
425 while (count >= sizeof(struct snd_seq_event)) {
428 nonblock = (file->f_flags & O_NONBLOCK) || result > 0;
429 if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) {
432 if (snd_seq_ev_is_variable(&cell->event)) {
433 struct snd_seq_event tmpev;
435 tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
436 if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) {
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));
451 if (copy_to_user(buf, &cell->event, sizeof(struct snd_seq_event))) {
455 count -= sizeof(struct snd_seq_event);
456 buf += sizeof(struct snd_seq_event);
458 snd_seq_cell_free(cell);
459 cell = NULL; /* to be sure */
460 result += sizeof(struct snd_seq_event);
465 snd_seq_fifo_cell_putback(fifo, cell);
466 if (err == -EAGAIN && result > 0)
469 snd_seq_fifo_unlock(fifo);
471 return (err < 0) ? err : result;
476 * check access permission to the port
478 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags)
480 if ((port->capability & flags) != flags)
486 * check if the destination client is available, and return the pointer
487 * if filter is non-zero, client filter bitmap is tested.
489 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event,
492 struct snd_seq_client *dest;
494 dest = snd_seq_client_use_ptr(event->dest.client);
497 if (! dest->accept_input)
499 if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) &&
500 ! test_bit(event->type, dest->event_filter))
502 if (filter && !(dest->filter & filter))
505 return dest; /* ok - accessible */
507 snd_seq_client_unlock(dest);
513 * Return the error event.
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
523 static int bounce_error_event(struct snd_seq_client *client,
524 struct snd_seq_event *event,
525 int err, int atomic, int hop)
527 struct snd_seq_event bounce_ev;
530 if (client == NULL ||
531 ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) ||
532 ! client->accept_input)
533 return 0; /* ignored */
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);
549 client->event_lost++;
558 * rewrite the time-stamp of the event record with the curren time
559 * of the given queue.
560 * return non-zero if updated.
562 static int update_timestamp_of_queue(struct snd_seq_event *event,
563 int queue, int real_time)
565 struct snd_seq_queue *q;
570 event->queue = queue;
571 event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK;
573 event->time.time = snd_seq_timer_get_cur_time(q->timer);
574 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL;
576 event->time.tick = snd_seq_timer_get_cur_tick(q->timer);
577 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK;
585 * deliver an event to the specified destination.
586 * if filter is non-zero, client filter bitmap is tested.
588 * RETURN VALUE: 0 : if succeeded
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)
595 struct snd_seq_client *dest = NULL;
596 struct snd_seq_client_port *dest_port = NULL;
597 int result = -ENOENT;
600 direct = snd_seq_ev_is_direct(event);
602 dest = get_event_dest_client(event, filter);
605 dest_port = snd_seq_port_use_ptr(dest, event->dest.port);
606 if (dest_port == NULL)
609 /* check permission */
610 if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) {
615 if (dest_port->timestamping)
616 update_timestamp_of_queue(event, dest_port->time_queue,
617 dest_port->time_real);
619 switch (dest->type) {
621 if (dest->data.user.fifo)
622 result = snd_seq_fifo_event_in(dest->data.user.fifo, event);
626 if (dest_port->event_input == NULL)
628 result = dest_port->event_input(event, direct,
629 dest_port->private_data,
638 snd_seq_port_unlock(dest_port);
640 snd_seq_client_unlock(dest);
642 if (result < 0 && !direct) {
643 result = bounce_error_event(client, event, result, atomic, hop);
650 * send the event to all subscribers:
652 static int deliver_to_subscribers(struct snd_seq_client *client,
653 struct snd_seq_event *event,
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;
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;
671 read_lock(&grp->list_lock);
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,
685 /* restore original event record */
686 *event = event_saved;
689 read_unlock(&grp->list_lock);
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;
698 #ifdef SUPPORT_BROADCAST
700 * broadcast to all ports:
702 static int port_broadcast_event(struct snd_seq_client *client,
703 struct snd_seq_event *event,
706 int num_ev = 0, err = 0;
707 struct snd_seq_client *dest_client;
708 struct snd_seq_client_port *port;
710 dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST);
711 if (dest_client == NULL)
712 return 0; /* no matching destination */
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,
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;
732 * send the event to all clients:
733 * if destination port is also ADDRESS_BROADCAST, deliver to all ports.
735 static int broadcast_event(struct snd_seq_client *client,
736 struct snd_seq_event *event, int atomic, int hop)
738 int err = 0, num_ev = 0;
740 struct snd_seq_addr addr;
742 addr = event->dest; /* save */
744 for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) {
745 /* don't send to itself */
746 if (dest == client->number)
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);
753 /* pass NULL as source client to avoid error bounce */
754 err = snd_seq_deliver_single_event(NULL, event,
755 SNDRV_SEQ_FILTER_BROADCAST,
761 event->dest = addr; /* restore */
762 return (err < 0) ? err : num_ev;
766 /* multicast - not supported yet */
767 static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event,
770 snd_printd("seq: multicast not supported yet.\n");
771 return 0; /* ignored */
773 #endif /* SUPPORT_BROADCAST */
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.
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.
784 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event,
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);
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);
810 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop);
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.
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.
825 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop)
827 struct snd_seq_client *client;
830 if (snd_BUG_ON(!cell))
833 client = snd_seq_client_use_ptr(cell->event.source.client);
834 if (client == NULL) {
835 snd_seq_cell_free(cell); /* release this cell */
839 if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) {
841 * the event cell is re-used as a NOTE-OFF event and
844 struct snd_seq_event tmpev, *ev;
846 /* reserve this event to enqueue note-off later */
848 tmpev.type = SNDRV_SEQ_EVENT_NOTEON;
849 result = snd_seq_deliver_event(client, &tmpev, atomic, hop);
852 * This was originally a note event. We now re-use the
853 * cell for the note-off event.
857 ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
858 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH;
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;
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;
873 ev->data.note.velocity = ev->data.note.off_velocity;
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 */
881 * event cell is freed after processing the event
884 result = snd_seq_deliver_event(client, &cell->event, atomic, hop);
885 snd_seq_cell_free(cell);
888 snd_seq_client_unlock(client);
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
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,
902 struct snd_seq_event_cell *cell;
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;
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;
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)
921 snd_seq_port_unlock(src_port);
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);
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 */
937 /* allocate an event cell */
938 err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, file);
942 /* we got a cell. enqueue it. */
943 if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
944 snd_seq_cell_free(cell);
953 * check validity of event type and data length.
954 * return non-zero if invalid.
956 static int check_event_type_and_length(struct snd_seq_event *ev)
958 switch (snd_seq_ev_length_type(ev)) {
959 case SNDRV_SEQ_EVENT_LENGTH_FIXED:
960 if (snd_seq_ev_is_variable_type(ev))
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)
968 case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
969 if (! snd_seq_ev_is_direct(ev))
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
988 static ssize_t snd_seq_write(struct file *file, const char __user *buf,
989 size_t count, loff_t *offset)
991 struct snd_seq_client *client = file->private_data;
992 int written = 0, len;
994 struct snd_seq_event event;
996 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
999 /* check client structures are in place */
1000 if (snd_BUG_ON(!client))
1003 if (!client->accept_output || client->pool == NULL)
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)
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)) {
1020 event.source.client = client->number; /* fill in client number */
1021 /* Check for extension data length */
1022 if (check_event_type_and_length(&event)) {
1027 /* check for special events */
1028 if (event.type == SNDRV_SEQ_EVENT_NONE)
1030 else if (snd_seq_ev_is_reserved(&event)) {
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 */
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 */
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;
1056 /* ok, enqueue it */
1057 err = snd_seq_client_enqueue_event(client, &event, file,
1058 !(file->f_flags & O_NONBLOCK),
1064 /* Update pointers and counts */
1070 return written ? written : err;
1077 static unsigned int snd_seq_poll(struct file *file, poll_table * wait)
1079 struct snd_seq_client *client = file->private_data;
1080 unsigned int mask = 0;
1082 /* check client structures are in place */
1083 if (snd_BUG_ON(!client))
1086 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1087 client->data.user.fifo) {
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;
1094 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
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;
1106 /*-----------------------------------------------------*/
1109 /* SYSTEM_INFO ioctl() */
1110 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void __user *arg)
1112 struct snd_seq_system_info info;
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();
1123 if (copy_to_user(arg, &info, sizeof(info)))
1129 /* RUNNING_MODE ioctl() */
1130 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void __user *arg)
1132 struct snd_seq_running_info info;
1133 struct snd_seq_client *cptr;
1136 if (copy_from_user(&info, arg, sizeof(info)))
1139 /* requested client number */
1140 cptr = snd_seq_client_use_ptr(info.client);
1142 return -ENOENT; /* don't change !!! */
1144 #ifdef SNDRV_BIG_ENDIAN
1145 if (! info.big_endian) {
1150 if (info.big_endian) {
1156 if (info.cpu_mode > sizeof(long)) {
1160 cptr->convert32 = (info.cpu_mode < sizeof(long));
1162 snd_seq_client_unlock(cptr);
1166 /* CLIENT_INFO ioctl() */
1167 static void get_client_info(struct snd_seq_client *cptr,
1168 struct snd_seq_client_info *info)
1170 info->client = cptr->number;
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));
1182 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
1185 struct snd_seq_client *cptr;
1186 struct snd_seq_client_info client_info;
1188 if (copy_from_user(&client_info, arg, sizeof(client_info)))
1191 /* requested client number */
1192 cptr = snd_seq_client_use_ptr(client_info.client);
1194 return -ENOENT; /* don't change !!! */
1196 get_client_info(cptr, &client_info);
1197 snd_seq_client_unlock(cptr);
1199 if (copy_to_user(arg, &client_info, sizeof(client_info)))
1205 /* CLIENT_INFO ioctl() */
1206 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
1209 struct snd_seq_client_info client_info;
1211 if (copy_from_user(&client_info, arg, sizeof(client_info)))
1214 /* it is not allowed to set the info fields for an another client */
1215 if (client->number != client_info.client)
1217 /* also client type must be set now */
1218 if (client->type != client_info.type)
1221 /* fill the info fields */
1222 if (client_info.name[0])
1223 strlcpy(client->name, client_info.name, sizeof(client->name));
1225 client->filter = client_info.filter;
1226 client->event_lost = client_info.event_lost;
1227 memcpy(client->event_filter, client_info.event_filter, 32);
1234 * CREATE PORT ioctl()
1236 static int snd_seq_ioctl_create_port(struct snd_seq_client *client,
1239 struct snd_seq_client_port *port;
1240 struct snd_seq_port_info info;
1241 struct snd_seq_port_callback *callback;
1243 if (copy_from_user(&info, arg, sizeof(info)))
1246 /* it is not allowed to create the port for an another client */
1247 if (info.addr.client != client->number)
1250 port = snd_seq_create_port(client, (info.flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info.addr.port : -1);
1254 if (client->type == USER_CLIENT && info.kernel) {
1255 snd_seq_delete_port(client, port->addr.port);
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;
1273 info.addr = port->addr;
1275 snd_seq_set_port_info(port, &info);
1276 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1278 if (copy_to_user(arg, &info, sizeof(info)))
1285 * DELETE PORT ioctl()
1287 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client,
1290 struct snd_seq_port_info info;
1293 /* set passed parameters */
1294 if (copy_from_user(&info, arg, sizeof(info)))
1297 /* it is not allowed to remove the port for an another client */
1298 if (info.addr.client != client->number)
1301 err = snd_seq_delete_port(client, info.addr.port);
1303 snd_seq_system_client_ev_port_exit(client->number, info.addr.port);
1309 * GET_PORT_INFO ioctl() (on any client)
1311 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client,
1314 struct snd_seq_client *cptr;
1315 struct snd_seq_client_port *port;
1316 struct snd_seq_port_info info;
1318 if (copy_from_user(&info, arg, sizeof(info)))
1320 cptr = snd_seq_client_use_ptr(info.addr.client);
1324 port = snd_seq_port_use_ptr(cptr, info.addr.port);
1326 snd_seq_client_unlock(cptr);
1327 return -ENOENT; /* don't change */
1331 snd_seq_get_port_info(port, &info);
1332 snd_seq_port_unlock(port);
1333 snd_seq_client_unlock(cptr);
1335 if (copy_to_user(arg, &info, sizeof(info)))
1342 * SET_PORT_INFO ioctl() (only ports on this/own client)
1344 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client,
1347 struct snd_seq_client_port *port;
1348 struct snd_seq_port_info info;
1350 if (copy_from_user(&info, arg, sizeof(info)))
1353 if (info.addr.client != client->number) /* only set our own ports ! */
1355 port = snd_seq_port_use_ptr(client, info.addr.port);
1357 snd_seq_set_port_info(port, &info);
1358 snd_seq_port_unlock(port);
1365 * port subscription (connection)
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)
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)
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))
1380 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1384 /* check read permission */
1385 /* if sender or receiver is the subscribing client itself,
1386 * no permission check is necessary
1388 if (client->number != subs->sender.client) {
1389 if (! check_port_perm(sport, PERM_RD))
1392 /* check write permission */
1393 if (client->number != subs->dest.client) {
1394 if (! check_port_perm(dport, PERM_WR))
1401 * send an subscription notify event to user client:
1402 * client must be user client.
1404 int snd_seq_client_notify_subscription(int client, int port,
1405 struct snd_seq_port_subscribe *info,
1408 struct snd_seq_event event;
1410 memset(&event, 0, sizeof(event));
1411 event.type = evtype;
1412 event.data.connect.dest = info->dest;
1413 event.data.connect.sender = info->sender;
1415 return snd_seq_system_notify(client, port, &event); /* non-atomic */
1420 * add to port's subscription list IOCTL interface
1422 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
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;
1430 if (copy_from_user(&subs, arg, sizeof(subs)))
1433 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1435 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1437 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1439 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1442 result = check_subscription_permission(client, sport, dport, &subs);
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);
1453 snd_seq_port_unlock(sport);
1455 snd_seq_port_unlock(dport);
1457 snd_seq_client_unlock(sender);
1459 snd_seq_client_unlock(receiver);
1465 * remove from port's subscription list
1467 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
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;
1475 if (copy_from_user(&subs, arg, sizeof(subs)))
1478 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1480 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1482 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1484 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1487 result = check_subscription_permission(client, sport, dport, &subs);
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);
1497 snd_seq_port_unlock(sport);
1499 snd_seq_port_unlock(dport);
1501 snd_seq_client_unlock(sender);
1503 snd_seq_client_unlock(receiver);
1508 /* CREATE_QUEUE ioctl() */
1509 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client,
1512 struct snd_seq_queue_info info;
1514 struct snd_seq_queue *q;
1516 if (copy_from_user(&info, arg, sizeof(info)))
1519 result = snd_seq_queue_alloc(client->number, info.locked, info.flags);
1523 q = queueptr(result);
1527 info.queue = q->queue;
1528 info.locked = q->locked;
1529 info.owner = q->owner;
1531 /* set queue name */
1533 snprintf(info.name, sizeof(info.name), "Queue-%d", q->queue);
1534 strlcpy(q->name, info.name, sizeof(q->name));
1537 if (copy_to_user(arg, &info, sizeof(info)))
1543 /* DELETE_QUEUE ioctl() */
1544 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client,
1547 struct snd_seq_queue_info info;
1549 if (copy_from_user(&info, arg, sizeof(info)))
1552 return snd_seq_queue_delete(client->number, info.queue);
1555 /* GET_QUEUE_INFO ioctl() */
1556 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client,
1559 struct snd_seq_queue_info info;
1560 struct snd_seq_queue *q;
1562 if (copy_from_user(&info, arg, sizeof(info)))
1565 q = queueptr(info.queue);
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));
1576 if (copy_to_user(arg, &info, sizeof(info)))
1582 /* SET_QUEUE_INFO ioctl() */
1583 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
1586 struct snd_seq_queue_info info;
1587 struct snd_seq_queue *q;
1589 if (copy_from_user(&info, arg, sizeof(info)))
1592 if (info.owner != client->number)
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)
1600 snd_seq_queue_use(info.queue, client->number, 1);
1605 q = queueptr(info.queue);
1608 if (q->owner != client->number) {
1612 strlcpy(q->name, info.name, sizeof(q->name));
1618 /* GET_NAMED_QUEUE ioctl() */
1619 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client, void __user *arg)
1621 struct snd_seq_queue_info info;
1622 struct snd_seq_queue *q;
1624 if (copy_from_user(&info, arg, sizeof(info)))
1627 q = snd_seq_queue_find_name(info.name);
1630 info.queue = q->queue;
1631 info.owner = q->owner;
1632 info.locked = q->locked;
1635 if (copy_to_user(arg, &info, sizeof(info)))
1641 /* GET_QUEUE_STATUS ioctl() */
1642 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
1645 struct snd_seq_queue_status status;
1646 struct snd_seq_queue *queue;
1647 struct snd_seq_timer *tmr;
1649 if (copy_from_user(&status, arg, sizeof(status)))
1652 queue = queueptr(status.queue);
1655 memset(&status, 0, sizeof(status));
1656 status.queue = queue->queue;
1659 status.events = queue->tickq->cells + queue->timeq->cells;
1661 status.time = snd_seq_timer_get_cur_time(tmr);
1662 status.tick = snd_seq_timer_get_cur_tick(tmr);
1664 status.running = tmr->running;
1666 status.flags = queue->flags;
1669 if (copy_to_user(arg, &status, sizeof(status)))
1675 /* GET_QUEUE_TEMPO ioctl() */
1676 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
1679 struct snd_seq_queue_tempo tempo;
1680 struct snd_seq_queue *queue;
1681 struct snd_seq_timer *tmr;
1683 if (copy_from_user(&tempo, arg, sizeof(tempo)))
1686 queue = queueptr(tempo.queue);
1689 memset(&tempo, 0, sizeof(tempo));
1690 tempo.queue = queue->queue;
1694 tempo.tempo = tmr->tempo;
1695 tempo.ppq = tmr->ppq;
1696 tempo.skew_value = tmr->skew;
1697 tempo.skew_base = tmr->skew_base;
1700 if (copy_to_user(arg, &tempo, sizeof(tempo)))
1706 /* SET_QUEUE_TEMPO ioctl() */
1707 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1709 if (!snd_seq_queue_check_access(tempo->queue, client))
1711 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1714 EXPORT_SYMBOL(snd_seq_set_queue_tempo);
1716 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
1720 struct snd_seq_queue_tempo tempo;
1722 if (copy_from_user(&tempo, arg, sizeof(tempo)))
1725 result = snd_seq_set_queue_tempo(client->number, &tempo);
1726 return result < 0 ? result : 0;
1730 /* GET_QUEUE_TIMER ioctl() */
1731 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
1734 struct snd_seq_queue_timer timer;
1735 struct snd_seq_queue *queue;
1736 struct snd_seq_timer *tmr;
1738 if (copy_from_user(&timer, arg, sizeof(timer)))
1741 queue = queueptr(timer.queue);
1745 if (mutex_lock_interruptible(&queue->timer_mutex)) {
1747 return -ERESTARTSYS;
1750 memset(&timer, 0, sizeof(timer));
1751 timer.queue = queue->queue;
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;
1758 mutex_unlock(&queue->timer_mutex);
1761 if (copy_to_user(arg, &timer, sizeof(timer)))
1767 /* SET_QUEUE_TIMER ioctl() */
1768 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
1772 struct snd_seq_queue_timer timer;
1774 if (copy_from_user(&timer, arg, sizeof(timer)))
1777 if (timer.type != SNDRV_SEQ_TIMER_ALSA)
1780 if (snd_seq_queue_check_access(timer.queue, client->number)) {
1781 struct snd_seq_queue *q;
1782 struct snd_seq_timer *tmr;
1784 q = queueptr(timer.queue);
1787 if (mutex_lock_interruptible(&q->timer_mutex)) {
1789 return -ERESTARTSYS;
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;
1798 result = snd_seq_queue_timer_open(timer.queue);
1799 mutex_unlock(&q->timer_mutex);
1809 /* GET_QUEUE_CLIENT ioctl() */
1810 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
1813 struct snd_seq_queue_client info;
1816 if (copy_from_user(&info, arg, sizeof(info)))
1819 used = snd_seq_queue_is_used(info.queue, client->number);
1823 info.client = client->number;
1825 if (copy_to_user(arg, &info, sizeof(info)))
1831 /* SET_QUEUE_CLIENT ioctl() */
1832 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
1836 struct snd_seq_queue_client info;
1838 if (copy_from_user(&info, arg, sizeof(info)))
1841 if (info.used >= 0) {
1842 err = snd_seq_queue_use(info.queue, client->number, info.used);
1847 return snd_seq_ioctl_get_queue_client(client, arg);
1851 /* GET_CLIENT_POOL ioctl() */
1852 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
1855 struct snd_seq_client_pool info;
1856 struct snd_seq_client *cptr;
1858 if (copy_from_user(&info, arg, sizeof(info)))
1861 cptr = snd_seq_client_use_ptr(info.client);
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);
1875 info.input_pool = 0;
1876 info.input_free = 0;
1878 snd_seq_client_unlock(cptr);
1880 if (copy_to_user(arg, &info, sizeof(info)))
1885 /* SET_CLIENT_POOL ioctl() */
1886 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
1889 struct snd_seq_client_pool info;
1892 if (copy_from_user(&info, arg, sizeof(info)))
1895 if (client->number != info.client)
1896 return -EINVAL; /* can't change other clients */
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);
1906 client->pool->size = info.output_pool;
1907 rc = snd_seq_pool_init(client->pool);
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);
1919 client->data.user.fifo_pool_size = info.input_pool;
1921 if (info.output_room >= 1 &&
1922 info.output_room <= client->pool->size) {
1923 client->pool->room = info.output_room;
1926 return snd_seq_ioctl_get_client_pool(client, arg);
1930 /* REMOVE_EVENTS ioctl() */
1931 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
1934 struct snd_seq_remove_events info;
1936 if (copy_from_user(&info, arg, sizeof(info)))
1940 * Input mostly not implemented XXX.
1942 if (info.remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1944 * No restrictions so for a user client we can clear
1947 if (client->type == USER_CLIENT)
1948 snd_seq_fifo_clear(client->data.user.fifo);
1951 if (info.remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1952 snd_seq_queue_remove_cells(client->number, &info);
1959 * get subscription info
1961 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
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;
1970 if (copy_from_user(&subs, arg, sizeof(subs)))
1974 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1976 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1978 p = snd_seq_port_get_subscription(&sport->c_src, &subs.dest);
1987 snd_seq_port_unlock(sport);
1989 snd_seq_client_unlock(sender);
1991 if (copy_to_user(arg, &subs, sizeof(subs)))
1999 * get subscription info - check only its presence
2001 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client,
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;
2012 if (copy_from_user(&subs, arg, sizeof(subs)))
2015 if ((cptr = snd_seq_client_use_ptr(subs.root.client)) == NULL)
2017 if ((port = snd_seq_port_use_ptr(cptr, subs.root.port)) == NULL)
2020 switch (subs.type) {
2021 case SNDRV_SEQ_QUERY_SUBS_READ:
2022 group = &port->c_src;
2024 case SNDRV_SEQ_QUERY_SUBS_WRITE:
2025 group = &port->c_dest;
2031 down_read(&group->list_mutex);
2032 /* search for the subscriber */
2033 subs.num_subs = group->count;
2036 list_for_each(p, &group->list_head) {
2037 if (i++ == subs.index) {
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;
2044 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2045 subs.addr = s->info.sender;
2047 subs.flags = s->info.flags;
2048 subs.queue = s->info.queue;
2053 up_read(&group->list_mutex);
2057 snd_seq_port_unlock(port);
2059 snd_seq_client_unlock(cptr);
2061 if (copy_to_user(arg, &subs, sizeof(subs)))
2071 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
2074 struct snd_seq_client *cptr = NULL;
2075 struct snd_seq_client_info info;
2077 if (copy_from_user(&info, arg, sizeof(info)))
2080 /* search for next client */
2082 if (info.client < 0)
2084 for (; info.client < SNDRV_SEQ_MAX_CLIENTS; info.client++) {
2085 cptr = snd_seq_client_use_ptr(info.client);
2092 get_client_info(cptr, &info);
2093 snd_seq_client_unlock(cptr);
2095 if (copy_to_user(arg, &info, sizeof(info)))
2103 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
2106 struct snd_seq_client *cptr;
2107 struct snd_seq_client_port *port = NULL;
2108 struct snd_seq_port_info info;
2110 if (copy_from_user(&info, arg, sizeof(info)))
2112 cptr = snd_seq_client_use_ptr(info.addr.client);
2116 /* search for next port */
2118 port = snd_seq_port_query_nearest(cptr, &info);
2120 snd_seq_client_unlock(cptr);
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);
2130 if (copy_to_user(arg, &info, sizeof(info)))
2135 /* -------------------------------------------------------- */
2137 static struct seq_ioctl_table {
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 },
2173 static int snd_seq_do_ioctl(struct snd_seq_client *client, unsigned int cmd,
2176 struct seq_ioctl_table *p;
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;
2189 for (p = ioctl_tables; p->cmd; p++) {
2191 return p->func(client, arg);
2193 snd_printd("seq unknown ioctl() 0x%x (type='%c', number=0x%2x)\n",
2194 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2199 static long snd_seq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2201 struct snd_seq_client *client = file->private_data;
2203 if (snd_BUG_ON(!client))
2206 return snd_seq_do_ioctl(client, cmd, (void __user *) arg);
2209 #ifdef CONFIG_COMPAT
2210 #include "seq_compat.c"
2212 #define snd_seq_ioctl_compat NULL
2215 /* -------------------------------------------------------- */
2218 /* exported to kernel modules */
2219 int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
2220 const char *name_fmt, ...)
2222 struct snd_seq_client *client;
2225 if (snd_BUG_ON(in_interrupt()))
2228 if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD)
2230 if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
2233 if (mutex_lock_interruptible(®ister_mutex))
2234 return -ERESTARTSYS;
2237 client_index += SNDRV_SEQ_GLOBAL_CLIENTS
2238 + card->number * SNDRV_SEQ_CLIENTS_PER_CARD;
2239 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN)
2243 /* empty write queue as default */
2244 client = seq_create_client1(client_index, 0);
2245 if (client == NULL) {
2246 mutex_unlock(®ister_mutex);
2247 return -EBUSY; /* failure code */
2249 usage_alloc(&client_usage, 1);
2251 client->accept_input = 1;
2252 client->accept_output = 1;
2254 va_start(args, name_fmt);
2255 vsnprintf(client->name, sizeof(client->name), name_fmt, args);
2258 client->type = KERNEL_CLIENT;
2259 mutex_unlock(®ister_mutex);
2261 /* make others aware this new client */
2262 snd_seq_system_client_ev_client_start(client->number);
2264 /* return client number to caller */
2265 return client->number;
2268 EXPORT_SYMBOL(snd_seq_create_kernel_client);
2270 /* exported to kernel modules */
2271 int snd_seq_delete_kernel_client(int client)
2273 struct snd_seq_client *ptr;
2275 if (snd_BUG_ON(in_interrupt()))
2278 ptr = clientptr(client);
2282 seq_free_client(ptr);
2287 EXPORT_SYMBOL(snd_seq_delete_kernel_client);
2289 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue
2290 * and snd_seq_kernel_client_enqueue_blocking
2292 static int kernel_client_enqueue(int client, struct snd_seq_event *ev,
2293 struct file *file, int blocking,
2294 int atomic, int hop)
2296 struct snd_seq_client *cptr;
2299 if (snd_BUG_ON(!ev))
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 */
2307 /* fill in client number */
2308 ev->source.client = client;
2310 if (check_event_type_and_length(ev))
2313 cptr = snd_seq_client_use_ptr(client);
2317 if (! cptr->accept_output)
2320 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, atomic, hop);
2322 snd_seq_client_unlock(cptr);
2327 * exported, called by kernel clients to enqueue events (w/o blocking)
2329 * RETURN VALUE: zero if succeed, negative if error
2331 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev,
2332 int atomic, int hop)
2334 return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop);
2337 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
2340 * exported, called by kernel clients to enqueue events (with blocking)
2342 * RETURN VALUE: zero if succeed, negative if error
2344 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev,
2346 int atomic, int hop)
2348 return kernel_client_enqueue(client, ev, file, 1, atomic, hop);
2351 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking);
2354 * exported, called by kernel clients to dispatch events directly to other
2355 * clients, bypassing the queues. Event time-stamp will be updated.
2357 * RETURN VALUE: negative = delivery failed,
2358 * zero, or positive: the number of delivered events
2360 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev,
2361 int atomic, int hop)
2363 struct snd_seq_client *cptr;
2366 if (snd_BUG_ON(!ev))
2369 /* fill in client number */
2370 ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2371 ev->source.client = client;
2373 if (check_event_type_and_length(ev))
2376 cptr = snd_seq_client_use_ptr(client);
2380 if (!cptr->accept_output)
2383 result = snd_seq_deliver_event(cptr, ev, atomic, hop);
2385 snd_seq_client_unlock(cptr);
2389 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch);
2392 * exported, called by kernel clients to perform same functions as with
2395 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2397 struct snd_seq_client *client;
2401 client = clientptr(clientid);
2404 fs = snd_enter_user();
2405 result = snd_seq_do_ioctl(client, cmd, (void __user *)arg);
2410 EXPORT_SYMBOL(snd_seq_kernel_client_ctl);
2412 /* exported (for OSS emulator) */
2413 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2415 struct snd_seq_client *client;
2417 client = clientptr(clientid);
2421 if (! snd_seq_write_pool_allocated(client))
2423 if (snd_seq_pool_poll_wait(client->pool, file, wait))
2428 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll);
2430 /*---------------------------------------------------------------------------*/
2432 #ifdef CONFIG_PROC_FS
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)
2440 struct list_head *p;
2441 struct snd_seq_subscribers *s;
2444 down_read(&group->list_mutex);
2445 if (list_empty(&group->list_head)) {
2446 up_read(&group->list_mutex);
2449 snd_iprintf(buffer, msg);
2450 list_for_each(p, &group->list_head) {
2452 s = list_entry(p, struct snd_seq_subscribers, src_list);
2454 s = list_entry(p, struct snd_seq_subscribers, dest_list);
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]");
2465 up_read(&group->list_mutex);
2466 snd_iprintf(buffer, "\n");
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')
2473 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2475 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
2476 struct snd_seq_client *client)
2478 struct snd_seq_client_port *p;
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: ");
2491 mutex_unlock(&client->ports_mutex);
2495 void snd_seq_info_pool(struct snd_info_buffer *buffer,
2496 struct snd_seq_pool *pool, char *space);
2498 /* exported to seq_info.c */
2499 void snd_seq_info_clients_read(struct snd_info_entry *entry,
2500 struct snd_info_buffer *buffer)
2503 struct snd_seq_client *client;
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");
2511 /* list the client table */
2512 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2513 client = snd_seq_client_use_ptr(c);
2516 if (client->type == NO_CLIENT) {
2517 snd_seq_client_unlock(client);
2521 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n",
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, " ");
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, " ");
2534 snd_seq_client_unlock(client);
2537 #endif /* CONFIG_PROC_FS */
2539 /*---------------------------------------------------------------------------*/
2546 static const struct file_operations snd_seq_f_ops =
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,
2559 * register sequencer device
2561 int __init snd_sequencer_device_init(void)
2565 if (mutex_lock_interruptible(®ister_mutex))
2566 return -ERESTARTSYS;
2568 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
2569 &snd_seq_f_ops, NULL, "seq")) < 0) {
2570 mutex_unlock(®ister_mutex);
2574 mutex_unlock(®ister_mutex);
2582 * unregister sequencer device
2584 void __exit snd_sequencer_device_done(void)
2586 snd_unregister_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0);