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/export.h>
26 #include <linux/slab.h>
27 #include <sound/core.h>
28 #include <sound/minors.h>
29 #include <linux/kmod.h>
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"
37 #include "seq_system.h"
38 #include <sound/seq_device.h>
40 #include <linux/compat.h>
45 * this module handles the connections of userland and kernel clients
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
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
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)
68 static DEFINE_SPINLOCK(clients_lock);
69 static DEFINE_MUTEX(register_mutex);
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;
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);
91 static inline mm_segment_t snd_enter_user(void)
93 mm_segment_t fs = get_fs();
98 static inline void snd_leave_user(mm_segment_t fs)
105 static inline unsigned short snd_seq_file_flags(struct file *file)
107 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
109 return SNDRV_SEQ_LFLG_OUTPUT;
111 return SNDRV_SEQ_LFLG_INPUT;
113 return SNDRV_SEQ_LFLG_OPEN;
117 static inline int snd_seq_write_pool_allocated(struct snd_seq_client *client)
119 return snd_seq_total_cells(client->pool) > 0;
122 /* return pointer to client structure for specified id */
123 static struct snd_seq_client *clientptr(int clientid)
125 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
126 snd_printd("Seq: oops. Trying to get pointer to client %d\n",
130 return clienttab[clientid];
133 struct snd_seq_client *snd_seq_client_use_ptr(int clientid)
136 struct snd_seq_client *client;
138 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
139 snd_printd("Seq: oops. Trying to get pointer to client %d\n",
143 spin_lock_irqsave(&clients_lock, flags);
144 client = clientptr(clientid);
147 if (clienttablock[clientid]) {
148 spin_unlock_irqrestore(&clients_lock, flags);
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) {
159 if (!client_requested[clientid]) {
160 client_requested[clientid] = 1;
161 for (idx = 0; idx < 15; idx++) {
162 if (seq_client_load[idx] < 0)
164 if (seq_client_load[idx] == clientid) {
165 request_module("snd-seq-client-%i",
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);
179 snd_seq_device_load_drivers();
182 spin_lock_irqsave(&clients_lock, flags);
183 client = clientptr(clientid);
186 spin_unlock_irqrestore(&clients_lock, flags);
192 snd_use_lock_use(&client->use_lock);
193 spin_unlock_irqrestore(&clients_lock, flags);
197 static void usage_alloc(struct snd_seq_usage *res, int num)
200 if (res->cur > res->peak)
201 res->peak = res->cur;
204 static void usage_free(struct snd_seq_usage *res, int num)
209 /* initialise data structures */
210 int __init client_init_data(void)
212 /* zap out the client table */
213 memset(&clienttablock, 0, sizeof(clienttablock));
214 memset(&clienttab, 0, sizeof(clienttab));
219 static struct snd_seq_client *seq_create_client1(int client_index, int poolsize)
223 struct snd_seq_client *client;
225 /* init client data */
226 client = kzalloc(sizeof(*client), GFP_KERNEL);
229 client->pool = snd_seq_pool_new(poolsize);
230 if (client->pool == NULL) {
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);
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;
246 if (clienttab[c] || clienttablock[c])
248 clienttab[client->number = c] = client;
249 spin_unlock_irqrestore(&clients_lock, flags);
253 if (clienttab[client_index] == NULL && !clienttablock[client_index]) {
254 clienttab[client->number = client_index] = client;
255 spin_unlock_irqrestore(&clients_lock, flags);
259 spin_unlock_irqrestore(&clients_lock, flags);
260 snd_seq_pool_delete(&client->pool);
262 return NULL; /* no free slot found or busy, return failure code */
266 static int seq_free_client1(struct snd_seq_client *client)
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);
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);
289 static void seq_free_client(struct snd_seq_client * client)
291 mutex_lock(®ister_mutex);
292 switch (client->type) {
294 snd_printk(KERN_WARNING "Seq: Trying to free unused client %d\n",
299 seq_free_client1(client);
300 usage_free(&client_usage, 1);
304 snd_printk(KERN_ERR "Seq: Trying to free client %d with undefined type = %d\n",
305 client->number, client->type);
307 mutex_unlock(®ister_mutex);
309 snd_seq_system_client_ev_client_exit(client->number);
314 /* -------------------------------------------------------- */
316 /* create a user client */
317 static int snd_seq_open(struct inode *inode, struct file *file)
319 int c, mode; /* client id */
320 struct snd_seq_client *client;
321 struct snd_seq_user_client *user;
324 err = nonseekable_open(inode, file);
328 if (mutex_lock_interruptible(®ister_mutex))
330 client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS);
331 if (client == NULL) {
332 mutex_unlock(®ister_mutex);
333 return -ENOMEM; /* failure code */
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;
342 user = &client->data.user;
344 user->fifo_pool_size = 0;
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);
352 mutex_unlock(®ister_mutex);
357 usage_alloc(&client_usage, 1);
358 client->type = USER_CLIENT;
359 mutex_unlock(®ister_mutex);
362 file->private_data = client;
364 /* fill client data */
366 sprintf(client->name, "Client-%d", c);
368 /* make others aware this new client */
369 snd_seq_system_client_ev_client_start(c);
374 /* delete a user client */
375 static int snd_seq_release(struct inode *inode, struct file *file)
377 struct snd_seq_client *client = file->private_data;
380 seq_free_client(client);
381 if (client->data.user.fifo)
382 snd_seq_fifo_delete(&client->data.user.fifo);
390 /* handle client read() */
391 /* possible error values:
392 * -ENXIO invalid client or file open mode
393 * -ENOSPC FIFO overflow (the flag is cleared after this error report)
394 * -EINVAL no enough user-space buffer to write the whole event
395 * -EFAULT seg. fault during copy to user space
397 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count,
400 struct snd_seq_client *client = file->private_data;
401 struct snd_seq_fifo *fifo;
404 struct snd_seq_event_cell *cell;
406 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT))
409 if (!access_ok(VERIFY_WRITE, buf, count))
412 /* check client structures are in place */
413 if (snd_BUG_ON(!client))
416 if (!client->accept_input || (fifo = client->data.user.fifo) == NULL)
419 if (atomic_read(&fifo->overflow) > 0) {
420 /* buffer overflow is detected */
421 snd_seq_fifo_clear(fifo);
422 /* return error code */
428 snd_seq_fifo_lock(fifo);
430 /* while data available in queue */
431 while (count >= sizeof(struct snd_seq_event)) {
434 nonblock = (file->f_flags & O_NONBLOCK) || result > 0;
435 if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) {
438 if (snd_seq_ev_is_variable(&cell->event)) {
439 struct snd_seq_event tmpev;
441 tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
442 if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) {
446 count -= sizeof(struct snd_seq_event);
447 buf += sizeof(struct snd_seq_event);
448 err = snd_seq_expand_var_event(&cell->event, count,
449 (char __force *)buf, 0,
450 sizeof(struct snd_seq_event));
457 if (copy_to_user(buf, &cell->event, sizeof(struct snd_seq_event))) {
461 count -= sizeof(struct snd_seq_event);
462 buf += sizeof(struct snd_seq_event);
464 snd_seq_cell_free(cell);
465 cell = NULL; /* to be sure */
466 result += sizeof(struct snd_seq_event);
471 snd_seq_fifo_cell_putback(fifo, cell);
472 if (err == -EAGAIN && result > 0)
475 snd_seq_fifo_unlock(fifo);
477 return (err < 0) ? err : result;
482 * check access permission to the port
484 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags)
486 if ((port->capability & flags) != flags)
492 * check if the destination client is available, and return the pointer
493 * if filter is non-zero, client filter bitmap is tested.
495 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event,
498 struct snd_seq_client *dest;
500 dest = snd_seq_client_use_ptr(event->dest.client);
503 if (! dest->accept_input)
505 if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) &&
506 ! test_bit(event->type, dest->event_filter))
508 if (filter && !(dest->filter & filter))
511 return dest; /* ok - accessible */
513 snd_seq_client_unlock(dest);
519 * Return the error event.
521 * If the receiver client is a user client, the original event is
522 * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event. If
523 * the original event is also variable length, the external data is
524 * copied after the event record.
525 * If the receiver client is a kernel client, the original event is
526 * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra
529 static int bounce_error_event(struct snd_seq_client *client,
530 struct snd_seq_event *event,
531 int err, int atomic, int hop)
533 struct snd_seq_event bounce_ev;
536 if (client == NULL ||
537 ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) ||
538 ! client->accept_input)
539 return 0; /* ignored */
541 /* set up quoted error */
542 memset(&bounce_ev, 0, sizeof(bounce_ev));
543 bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR;
544 bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED;
545 bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT;
546 bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
547 bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
548 bounce_ev.dest.client = client->number;
549 bounce_ev.dest.port = event->source.port;
550 bounce_ev.data.quote.origin = event->dest;
551 bounce_ev.data.quote.event = event;
552 bounce_ev.data.quote.value = -err; /* use positive value */
553 result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1);
555 client->event_lost++;
564 * rewrite the time-stamp of the event record with the curren time
565 * of the given queue.
566 * return non-zero if updated.
568 static int update_timestamp_of_queue(struct snd_seq_event *event,
569 int queue, int real_time)
571 struct snd_seq_queue *q;
576 event->queue = queue;
577 event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK;
579 event->time.time = snd_seq_timer_get_cur_time(q->timer);
580 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL;
582 event->time.tick = snd_seq_timer_get_cur_tick(q->timer);
583 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK;
591 * deliver an event to the specified destination.
592 * if filter is non-zero, client filter bitmap is tested.
594 * RETURN VALUE: 0 : if succeeded
597 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
598 struct snd_seq_event *event,
599 int filter, int atomic, int hop)
601 struct snd_seq_client *dest = NULL;
602 struct snd_seq_client_port *dest_port = NULL;
603 int result = -ENOENT;
606 direct = snd_seq_ev_is_direct(event);
608 dest = get_event_dest_client(event, filter);
611 dest_port = snd_seq_port_use_ptr(dest, event->dest.port);
612 if (dest_port == NULL)
615 /* check permission */
616 if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) {
621 if (dest_port->timestamping)
622 update_timestamp_of_queue(event, dest_port->time_queue,
623 dest_port->time_real);
625 switch (dest->type) {
627 if (dest->data.user.fifo)
628 result = snd_seq_fifo_event_in(dest->data.user.fifo, event);
632 if (dest_port->event_input == NULL)
634 result = dest_port->event_input(event, direct,
635 dest_port->private_data,
644 snd_seq_port_unlock(dest_port);
646 snd_seq_client_unlock(dest);
648 if (result < 0 && !direct) {
649 result = bounce_error_event(client, event, result, atomic, hop);
656 * send the event to all subscribers:
658 static int deliver_to_subscribers(struct snd_seq_client *client,
659 struct snd_seq_event *event,
662 struct snd_seq_subscribers *subs;
663 int err = 0, num_ev = 0;
664 struct snd_seq_event event_saved;
665 struct snd_seq_client_port *src_port;
666 struct snd_seq_port_subs_info *grp;
668 src_port = snd_seq_port_use_ptr(client, event->source.port);
669 if (src_port == NULL)
670 return -EINVAL; /* invalid source port */
671 /* save original event record */
672 event_saved = *event;
673 grp = &src_port->c_src;
677 read_lock(&grp->list_lock);
679 down_read(&grp->list_mutex);
680 list_for_each_entry(subs, &grp->list_head, src_list) {
681 /* both ports ready? */
682 if (atomic_read(&subs->ref_count) != 2)
684 event->dest = subs->info.dest;
685 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
686 /* convert time according to flag with subscription */
687 update_timestamp_of_queue(event, subs->info.queue,
688 subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL);
689 err = snd_seq_deliver_single_event(client, event,
694 /* restore original event record */
695 *event = event_saved;
698 read_unlock(&grp->list_lock);
700 up_read(&grp->list_mutex);
701 *event = event_saved; /* restore */
702 snd_seq_port_unlock(src_port);
703 return (err < 0) ? err : num_ev;
707 #ifdef SUPPORT_BROADCAST
709 * broadcast to all ports:
711 static int port_broadcast_event(struct snd_seq_client *client,
712 struct snd_seq_event *event,
715 int num_ev = 0, err = 0;
716 struct snd_seq_client *dest_client;
717 struct snd_seq_client_port *port;
719 dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST);
720 if (dest_client == NULL)
721 return 0; /* no matching destination */
723 read_lock(&dest_client->ports_lock);
724 list_for_each_entry(port, &dest_client->ports_list_head, list) {
725 event->dest.port = port->addr.port;
726 /* pass NULL as source client to avoid error bounce */
727 err = snd_seq_deliver_single_event(NULL, event,
728 SNDRV_SEQ_FILTER_BROADCAST,
734 read_unlock(&dest_client->ports_lock);
735 snd_seq_client_unlock(dest_client);
736 event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */
737 return (err < 0) ? err : num_ev;
741 * send the event to all clients:
742 * if destination port is also ADDRESS_BROADCAST, deliver to all ports.
744 static int broadcast_event(struct snd_seq_client *client,
745 struct snd_seq_event *event, int atomic, int hop)
747 int err = 0, num_ev = 0;
749 struct snd_seq_addr addr;
751 addr = event->dest; /* save */
753 for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) {
754 /* don't send to itself */
755 if (dest == client->number)
757 event->dest.client = dest;
758 event->dest.port = addr.port;
759 if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST)
760 err = port_broadcast_event(client, event, atomic, hop);
762 /* pass NULL as source client to avoid error bounce */
763 err = snd_seq_deliver_single_event(NULL, event,
764 SNDRV_SEQ_FILTER_BROADCAST,
770 event->dest = addr; /* restore */
771 return (err < 0) ? err : num_ev;
775 /* multicast - not supported yet */
776 static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event,
779 snd_printd("seq: multicast not supported yet.\n");
780 return 0; /* ignored */
782 #endif /* SUPPORT_BROADCAST */
785 /* deliver an event to the destination port(s).
786 * if the event is to subscribers or broadcast, the event is dispatched
787 * to multiple targets.
789 * RETURN VALUE: n > 0 : the number of delivered events.
790 * n == 0 : the event was not passed to any client.
791 * n < 0 : error - event was not processed.
793 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event,
799 if (hop >= SNDRV_SEQ_MAX_HOPS) {
800 snd_printd("too long delivery path (%d:%d->%d:%d)\n",
801 event->source.client, event->source.port,
802 event->dest.client, event->dest.port);
806 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS ||
807 event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS)
808 result = deliver_to_subscribers(client, event, atomic, hop);
809 #ifdef SUPPORT_BROADCAST
810 else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST ||
811 event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST)
812 result = broadcast_event(client, event, atomic, hop);
813 else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS)
814 result = multicast_event(client, event, atomic, hop);
815 else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST)
816 result = port_broadcast_event(client, event, atomic, hop);
819 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop);
825 * dispatch an event cell:
826 * This function is called only from queue check routines in timer
827 * interrupts or after enqueued.
828 * The event cell shall be released or re-queued in this function.
830 * RETURN VALUE: n > 0 : the number of delivered events.
831 * n == 0 : the event was not passed to any client.
832 * n < 0 : error - event was not processed.
834 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop)
836 struct snd_seq_client *client;
839 if (snd_BUG_ON(!cell))
842 client = snd_seq_client_use_ptr(cell->event.source.client);
843 if (client == NULL) {
844 snd_seq_cell_free(cell); /* release this cell */
848 if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) {
850 * the event cell is re-used as a NOTE-OFF event and
853 struct snd_seq_event tmpev, *ev;
855 /* reserve this event to enqueue note-off later */
857 tmpev.type = SNDRV_SEQ_EVENT_NOTEON;
858 result = snd_seq_deliver_event(client, &tmpev, atomic, hop);
861 * This was originally a note event. We now re-use the
862 * cell for the note-off event.
866 ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
867 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH;
869 /* add the duration time */
870 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) {
871 case SNDRV_SEQ_TIME_STAMP_TICK:
872 ev->time.tick += ev->data.note.duration;
874 case SNDRV_SEQ_TIME_STAMP_REAL:
875 /* unit for duration is ms */
876 ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000);
877 ev->time.time.tv_sec += ev->data.note.duration / 1000 +
878 ev->time.time.tv_nsec / 1000000000;
879 ev->time.time.tv_nsec %= 1000000000;
882 ev->data.note.velocity = ev->data.note.off_velocity;
884 /* Now queue this cell as the note off event */
885 if (snd_seq_enqueue_event(cell, atomic, hop) < 0)
886 snd_seq_cell_free(cell); /* release this cell */
890 * event cell is freed after processing the event
893 result = snd_seq_deliver_event(client, &cell->event, atomic, hop);
894 snd_seq_cell_free(cell);
897 snd_seq_client_unlock(client);
902 /* Allocate a cell from client pool and enqueue it to queue:
903 * if pool is empty and blocking is TRUE, sleep until a new cell is
906 static int snd_seq_client_enqueue_event(struct snd_seq_client *client,
907 struct snd_seq_event *event,
908 struct file *file, int blocking,
911 struct snd_seq_event_cell *cell;
914 /* special queue values - force direct passing */
915 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
916 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
917 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
919 #ifdef SUPPORT_BROADCAST
920 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) {
921 event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST;
922 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
925 if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
926 /* check presence of source port */
927 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port);
928 if (src_port == NULL)
930 snd_seq_port_unlock(src_port);
933 /* direct event processing without enqueued */
934 if (snd_seq_ev_is_direct(event)) {
935 if (event->type == SNDRV_SEQ_EVENT_NOTE)
936 return -EINVAL; /* this event must be enqueued! */
937 return snd_seq_deliver_event(client, event, atomic, hop);
940 /* Not direct, normal queuing */
941 if (snd_seq_queue_is_used(event->queue, client->number) <= 0)
942 return -EINVAL; /* invalid queue */
943 if (! snd_seq_write_pool_allocated(client))
944 return -ENXIO; /* queue is not allocated */
946 /* allocate an event cell */
947 err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, file);
951 /* we got a cell. enqueue it. */
952 if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
953 snd_seq_cell_free(cell);
962 * check validity of event type and data length.
963 * return non-zero if invalid.
965 static int check_event_type_and_length(struct snd_seq_event *ev)
967 switch (snd_seq_ev_length_type(ev)) {
968 case SNDRV_SEQ_EVENT_LENGTH_FIXED:
969 if (snd_seq_ev_is_variable_type(ev))
972 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
973 if (! snd_seq_ev_is_variable_type(ev) ||
974 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
977 case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
978 if (! snd_seq_ev_is_direct(ev))
987 /* possible error values:
988 * -ENXIO invalid client or file open mode
989 * -ENOMEM malloc failed
990 * -EFAULT seg. fault during copy from user space
991 * -EINVAL invalid event
992 * -EAGAIN no space in output pool
993 * -EINTR interrupts while sleep
994 * -EMLINK too many hops
995 * others depends on return value from driver callback
997 static ssize_t snd_seq_write(struct file *file, const char __user *buf,
998 size_t count, loff_t *offset)
1000 struct snd_seq_client *client = file->private_data;
1001 int written = 0, len;
1003 struct snd_seq_event event;
1005 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
1008 /* check client structures are in place */
1009 if (snd_BUG_ON(!client))
1012 if (!client->accept_output || client->pool == NULL)
1015 /* allocate the pool now if the pool is not allocated yet */
1016 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
1017 if (snd_seq_pool_init(client->pool) < 0)
1021 /* only process whole events */
1022 while (count >= sizeof(struct snd_seq_event)) {
1023 /* Read in the event header from the user */
1024 len = sizeof(event);
1025 if (copy_from_user(&event, buf, len)) {
1029 event.source.client = client->number; /* fill in client number */
1030 /* Check for extension data length */
1031 if (check_event_type_and_length(&event)) {
1036 /* check for special events */
1037 if (event.type == SNDRV_SEQ_EVENT_NONE)
1039 else if (snd_seq_ev_is_reserved(&event)) {
1044 if (snd_seq_ev_is_variable(&event)) {
1045 int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK;
1046 if ((size_t)(extlen + len) > count) {
1047 /* back out, will get an error this time or next */
1051 /* set user space pointer */
1052 event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
1053 event.data.ext.ptr = (char __force *)buf
1054 + sizeof(struct snd_seq_event);
1055 len += extlen; /* increment data length */
1057 #ifdef CONFIG_COMPAT
1058 if (client->convert32 && snd_seq_ev_is_varusr(&event)) {
1059 void *ptr = (void __force *)compat_ptr(event.data.raw32.d[1]);
1060 event.data.ext.ptr = ptr;
1065 /* ok, enqueue it */
1066 err = snd_seq_client_enqueue_event(client, &event, file,
1067 !(file->f_flags & O_NONBLOCK),
1073 /* Update pointers and counts */
1079 return written ? written : err;
1086 static unsigned int snd_seq_poll(struct file *file, poll_table * wait)
1088 struct snd_seq_client *client = file->private_data;
1089 unsigned int mask = 0;
1091 /* check client structures are in place */
1092 if (snd_BUG_ON(!client))
1095 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1096 client->data.user.fifo) {
1098 /* check if data is available in the outqueue */
1099 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
1100 mask |= POLLIN | POLLRDNORM;
1103 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1105 /* check if data is available in the pool */
1106 if (!snd_seq_write_pool_allocated(client) ||
1107 snd_seq_pool_poll_wait(client->pool, file, wait))
1108 mask |= POLLOUT | POLLWRNORM;
1115 /*-----------------------------------------------------*/
1118 /* SYSTEM_INFO ioctl() */
1119 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void __user *arg)
1121 struct snd_seq_system_info info;
1123 memset(&info, 0, sizeof(info));
1124 /* fill the info fields */
1125 info.queues = SNDRV_SEQ_MAX_QUEUES;
1126 info.clients = SNDRV_SEQ_MAX_CLIENTS;
1127 info.ports = 256; /* fixed limit */
1128 info.channels = 256; /* fixed limit */
1129 info.cur_clients = client_usage.cur;
1130 info.cur_queues = snd_seq_queue_get_cur_queues();
1132 if (copy_to_user(arg, &info, sizeof(info)))
1138 /* RUNNING_MODE ioctl() */
1139 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void __user *arg)
1141 struct snd_seq_running_info info;
1142 struct snd_seq_client *cptr;
1145 if (copy_from_user(&info, arg, sizeof(info)))
1148 /* requested client number */
1149 cptr = snd_seq_client_use_ptr(info.client);
1151 return -ENOENT; /* don't change !!! */
1153 #ifdef SNDRV_BIG_ENDIAN
1154 if (! info.big_endian) {
1159 if (info.big_endian) {
1165 if (info.cpu_mode > sizeof(long)) {
1169 cptr->convert32 = (info.cpu_mode < sizeof(long));
1171 snd_seq_client_unlock(cptr);
1175 /* CLIENT_INFO ioctl() */
1176 static void get_client_info(struct snd_seq_client *cptr,
1177 struct snd_seq_client_info *info)
1179 info->client = cptr->number;
1181 /* fill the info fields */
1182 info->type = cptr->type;
1183 strcpy(info->name, cptr->name);
1184 info->filter = cptr->filter;
1185 info->event_lost = cptr->event_lost;
1186 memcpy(info->event_filter, cptr->event_filter, 32);
1187 info->num_ports = cptr->num_ports;
1188 memset(info->reserved, 0, sizeof(info->reserved));
1191 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
1194 struct snd_seq_client *cptr;
1195 struct snd_seq_client_info client_info;
1197 if (copy_from_user(&client_info, arg, sizeof(client_info)))
1200 /* requested client number */
1201 cptr = snd_seq_client_use_ptr(client_info.client);
1203 return -ENOENT; /* don't change !!! */
1205 get_client_info(cptr, &client_info);
1206 snd_seq_client_unlock(cptr);
1208 if (copy_to_user(arg, &client_info, sizeof(client_info)))
1214 /* CLIENT_INFO ioctl() */
1215 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
1218 struct snd_seq_client_info client_info;
1220 if (copy_from_user(&client_info, arg, sizeof(client_info)))
1223 /* it is not allowed to set the info fields for an another client */
1224 if (client->number != client_info.client)
1226 /* also client type must be set now */
1227 if (client->type != client_info.type)
1230 /* fill the info fields */
1231 if (client_info.name[0])
1232 strlcpy(client->name, client_info.name, sizeof(client->name));
1234 client->filter = client_info.filter;
1235 client->event_lost = client_info.event_lost;
1236 memcpy(client->event_filter, client_info.event_filter, 32);
1243 * CREATE PORT ioctl()
1245 static int snd_seq_ioctl_create_port(struct snd_seq_client *client,
1248 struct snd_seq_client_port *port;
1249 struct snd_seq_port_info info;
1250 struct snd_seq_port_callback *callback;
1253 if (copy_from_user(&info, arg, sizeof(info)))
1256 /* it is not allowed to create the port for an another client */
1257 if (info.addr.client != client->number)
1260 port = snd_seq_create_port(client, (info.flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info.addr.port : -1);
1264 if (client->type == USER_CLIENT && info.kernel) {
1265 port_idx = port->addr.port;
1266 snd_seq_port_unlock(port);
1267 snd_seq_delete_port(client, port_idx);
1270 if (client->type == KERNEL_CLIENT) {
1271 if ((callback = info.kernel) != NULL) {
1272 if (callback->owner)
1273 port->owner = callback->owner;
1274 port->private_data = callback->private_data;
1275 port->private_free = callback->private_free;
1276 port->callback_all = callback->callback_all;
1277 port->event_input = callback->event_input;
1278 port->c_src.open = callback->subscribe;
1279 port->c_src.close = callback->unsubscribe;
1280 port->c_dest.open = callback->use;
1281 port->c_dest.close = callback->unuse;
1285 info.addr = port->addr;
1287 snd_seq_set_port_info(port, &info);
1288 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1289 snd_seq_port_unlock(port);
1291 if (copy_to_user(arg, &info, sizeof(info)))
1298 * DELETE PORT ioctl()
1300 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client,
1303 struct snd_seq_port_info info;
1306 /* set passed parameters */
1307 if (copy_from_user(&info, arg, sizeof(info)))
1310 /* it is not allowed to remove the port for an another client */
1311 if (info.addr.client != client->number)
1314 err = snd_seq_delete_port(client, info.addr.port);
1316 snd_seq_system_client_ev_port_exit(client->number, info.addr.port);
1322 * GET_PORT_INFO ioctl() (on any client)
1324 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client,
1327 struct snd_seq_client *cptr;
1328 struct snd_seq_client_port *port;
1329 struct snd_seq_port_info info;
1331 if (copy_from_user(&info, arg, sizeof(info)))
1333 cptr = snd_seq_client_use_ptr(info.addr.client);
1337 port = snd_seq_port_use_ptr(cptr, info.addr.port);
1339 snd_seq_client_unlock(cptr);
1340 return -ENOENT; /* don't change */
1344 snd_seq_get_port_info(port, &info);
1345 snd_seq_port_unlock(port);
1346 snd_seq_client_unlock(cptr);
1348 if (copy_to_user(arg, &info, sizeof(info)))
1355 * SET_PORT_INFO ioctl() (only ports on this/own client)
1357 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client,
1360 struct snd_seq_client_port *port;
1361 struct snd_seq_port_info info;
1363 if (copy_from_user(&info, arg, sizeof(info)))
1366 if (info.addr.client != client->number) /* only set our own ports ! */
1368 port = snd_seq_port_use_ptr(client, info.addr.port);
1370 snd_seq_set_port_info(port, &info);
1371 snd_seq_port_unlock(port);
1378 * port subscription (connection)
1380 #define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1381 #define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1383 static int check_subscription_permission(struct snd_seq_client *client,
1384 struct snd_seq_client_port *sport,
1385 struct snd_seq_client_port *dport,
1386 struct snd_seq_port_subscribe *subs)
1388 if (client->number != subs->sender.client &&
1389 client->number != subs->dest.client) {
1390 /* connection by third client - check export permission */
1391 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1393 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1397 /* check read permission */
1398 /* if sender or receiver is the subscribing client itself,
1399 * no permission check is necessary
1401 if (client->number != subs->sender.client) {
1402 if (! check_port_perm(sport, PERM_RD))
1405 /* check write permission */
1406 if (client->number != subs->dest.client) {
1407 if (! check_port_perm(dport, PERM_WR))
1414 * send an subscription notify event to user client:
1415 * client must be user client.
1417 int snd_seq_client_notify_subscription(int client, int port,
1418 struct snd_seq_port_subscribe *info,
1421 struct snd_seq_event event;
1423 memset(&event, 0, sizeof(event));
1424 event.type = evtype;
1425 event.data.connect.dest = info->dest;
1426 event.data.connect.sender = info->sender;
1428 return snd_seq_system_notify(client, port, &event); /* non-atomic */
1433 * add to port's subscription list IOCTL interface
1435 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
1438 int result = -EINVAL;
1439 struct snd_seq_client *receiver = NULL, *sender = NULL;
1440 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1441 struct snd_seq_port_subscribe subs;
1443 if (copy_from_user(&subs, arg, sizeof(subs)))
1446 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1448 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1450 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1452 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1455 result = check_subscription_permission(client, sport, dport, &subs);
1460 result = snd_seq_port_connect(client, sender, sport, receiver, dport, &subs);
1461 if (! result) /* broadcast announce */
1462 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1463 &subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1466 snd_seq_port_unlock(sport);
1468 snd_seq_port_unlock(dport);
1470 snd_seq_client_unlock(sender);
1472 snd_seq_client_unlock(receiver);
1478 * remove from port's subscription list
1480 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
1483 int result = -ENXIO;
1484 struct snd_seq_client *receiver = NULL, *sender = NULL;
1485 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1486 struct snd_seq_port_subscribe subs;
1488 if (copy_from_user(&subs, arg, sizeof(subs)))
1491 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1493 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1495 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1497 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1500 result = check_subscription_permission(client, sport, dport, &subs);
1504 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, &subs);
1505 if (! result) /* broadcast announce */
1506 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1507 &subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1510 snd_seq_port_unlock(sport);
1512 snd_seq_port_unlock(dport);
1514 snd_seq_client_unlock(sender);
1516 snd_seq_client_unlock(receiver);
1521 /* CREATE_QUEUE ioctl() */
1522 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client,
1525 struct snd_seq_queue_info info;
1527 struct snd_seq_queue *q;
1529 if (copy_from_user(&info, arg, sizeof(info)))
1532 result = snd_seq_queue_alloc(client->number, info.locked, info.flags);
1536 q = queueptr(result);
1540 info.queue = q->queue;
1541 info.locked = q->locked;
1542 info.owner = q->owner;
1544 /* set queue name */
1546 snprintf(info.name, sizeof(info.name), "Queue-%d", q->queue);
1547 strlcpy(q->name, info.name, sizeof(q->name));
1550 if (copy_to_user(arg, &info, sizeof(info)))
1556 /* DELETE_QUEUE ioctl() */
1557 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client,
1560 struct snd_seq_queue_info info;
1562 if (copy_from_user(&info, arg, sizeof(info)))
1565 return snd_seq_queue_delete(client->number, info.queue);
1568 /* GET_QUEUE_INFO ioctl() */
1569 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client,
1572 struct snd_seq_queue_info info;
1573 struct snd_seq_queue *q;
1575 if (copy_from_user(&info, arg, sizeof(info)))
1578 q = queueptr(info.queue);
1582 memset(&info, 0, sizeof(info));
1583 info.queue = q->queue;
1584 info.owner = q->owner;
1585 info.locked = q->locked;
1586 strlcpy(info.name, q->name, sizeof(info.name));
1589 if (copy_to_user(arg, &info, sizeof(info)))
1595 /* SET_QUEUE_INFO ioctl() */
1596 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
1599 struct snd_seq_queue_info info;
1600 struct snd_seq_queue *q;
1602 if (copy_from_user(&info, arg, sizeof(info)))
1605 if (info.owner != client->number)
1608 /* change owner/locked permission */
1609 if (snd_seq_queue_check_access(info.queue, client->number)) {
1610 if (snd_seq_queue_set_owner(info.queue, client->number, info.locked) < 0)
1613 snd_seq_queue_use(info.queue, client->number, 1);
1618 q = queueptr(info.queue);
1621 if (q->owner != client->number) {
1625 strlcpy(q->name, info.name, sizeof(q->name));
1631 /* GET_NAMED_QUEUE ioctl() */
1632 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client, void __user *arg)
1634 struct snd_seq_queue_info info;
1635 struct snd_seq_queue *q;
1637 if (copy_from_user(&info, arg, sizeof(info)))
1640 q = snd_seq_queue_find_name(info.name);
1643 info.queue = q->queue;
1644 info.owner = q->owner;
1645 info.locked = q->locked;
1648 if (copy_to_user(arg, &info, sizeof(info)))
1654 /* GET_QUEUE_STATUS ioctl() */
1655 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
1658 struct snd_seq_queue_status status;
1659 struct snd_seq_queue *queue;
1660 struct snd_seq_timer *tmr;
1662 if (copy_from_user(&status, arg, sizeof(status)))
1665 queue = queueptr(status.queue);
1668 memset(&status, 0, sizeof(status));
1669 status.queue = queue->queue;
1672 status.events = queue->tickq->cells + queue->timeq->cells;
1674 status.time = snd_seq_timer_get_cur_time(tmr);
1675 status.tick = snd_seq_timer_get_cur_tick(tmr);
1677 status.running = tmr->running;
1679 status.flags = queue->flags;
1682 if (copy_to_user(arg, &status, sizeof(status)))
1688 /* GET_QUEUE_TEMPO ioctl() */
1689 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
1692 struct snd_seq_queue_tempo tempo;
1693 struct snd_seq_queue *queue;
1694 struct snd_seq_timer *tmr;
1696 if (copy_from_user(&tempo, arg, sizeof(tempo)))
1699 queue = queueptr(tempo.queue);
1702 memset(&tempo, 0, sizeof(tempo));
1703 tempo.queue = queue->queue;
1707 tempo.tempo = tmr->tempo;
1708 tempo.ppq = tmr->ppq;
1709 tempo.skew_value = tmr->skew;
1710 tempo.skew_base = tmr->skew_base;
1713 if (copy_to_user(arg, &tempo, sizeof(tempo)))
1719 /* SET_QUEUE_TEMPO ioctl() */
1720 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1722 if (!snd_seq_queue_check_access(tempo->queue, client))
1724 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1727 EXPORT_SYMBOL(snd_seq_set_queue_tempo);
1729 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
1733 struct snd_seq_queue_tempo tempo;
1735 if (copy_from_user(&tempo, arg, sizeof(tempo)))
1738 result = snd_seq_set_queue_tempo(client->number, &tempo);
1739 return result < 0 ? result : 0;
1743 /* GET_QUEUE_TIMER ioctl() */
1744 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
1747 struct snd_seq_queue_timer timer;
1748 struct snd_seq_queue *queue;
1749 struct snd_seq_timer *tmr;
1751 if (copy_from_user(&timer, arg, sizeof(timer)))
1754 queue = queueptr(timer.queue);
1758 if (mutex_lock_interruptible(&queue->timer_mutex)) {
1760 return -ERESTARTSYS;
1763 memset(&timer, 0, sizeof(timer));
1764 timer.queue = queue->queue;
1766 timer.type = tmr->type;
1767 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1768 timer.u.alsa.id = tmr->alsa_id;
1769 timer.u.alsa.resolution = tmr->preferred_resolution;
1771 mutex_unlock(&queue->timer_mutex);
1774 if (copy_to_user(arg, &timer, sizeof(timer)))
1780 /* SET_QUEUE_TIMER ioctl() */
1781 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
1785 struct snd_seq_queue_timer timer;
1787 if (copy_from_user(&timer, arg, sizeof(timer)))
1790 if (timer.type != SNDRV_SEQ_TIMER_ALSA)
1793 if (snd_seq_queue_check_access(timer.queue, client->number)) {
1794 struct snd_seq_queue *q;
1795 struct snd_seq_timer *tmr;
1797 q = queueptr(timer.queue);
1800 if (mutex_lock_interruptible(&q->timer_mutex)) {
1802 return -ERESTARTSYS;
1805 snd_seq_queue_timer_close(timer.queue);
1806 tmr->type = timer.type;
1807 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1808 tmr->alsa_id = timer.u.alsa.id;
1809 tmr->preferred_resolution = timer.u.alsa.resolution;
1811 result = snd_seq_queue_timer_open(timer.queue);
1812 mutex_unlock(&q->timer_mutex);
1822 /* GET_QUEUE_CLIENT ioctl() */
1823 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
1826 struct snd_seq_queue_client info;
1829 if (copy_from_user(&info, arg, sizeof(info)))
1832 used = snd_seq_queue_is_used(info.queue, client->number);
1836 info.client = client->number;
1838 if (copy_to_user(arg, &info, sizeof(info)))
1844 /* SET_QUEUE_CLIENT ioctl() */
1845 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
1849 struct snd_seq_queue_client info;
1851 if (copy_from_user(&info, arg, sizeof(info)))
1854 if (info.used >= 0) {
1855 err = snd_seq_queue_use(info.queue, client->number, info.used);
1860 return snd_seq_ioctl_get_queue_client(client, arg);
1864 /* GET_CLIENT_POOL ioctl() */
1865 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
1868 struct snd_seq_client_pool info;
1869 struct snd_seq_client *cptr;
1871 if (copy_from_user(&info, arg, sizeof(info)))
1874 cptr = snd_seq_client_use_ptr(info.client);
1877 memset(&info, 0, sizeof(info));
1878 info.output_pool = cptr->pool->size;
1879 info.output_room = cptr->pool->room;
1880 info.output_free = info.output_pool;
1881 info.output_free = snd_seq_unused_cells(cptr->pool);
1882 if (cptr->type == USER_CLIENT) {
1883 info.input_pool = cptr->data.user.fifo_pool_size;
1884 info.input_free = info.input_pool;
1885 if (cptr->data.user.fifo)
1886 info.input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool);
1888 info.input_pool = 0;
1889 info.input_free = 0;
1891 snd_seq_client_unlock(cptr);
1893 if (copy_to_user(arg, &info, sizeof(info)))
1898 /* SET_CLIENT_POOL ioctl() */
1899 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
1902 struct snd_seq_client_pool info;
1905 if (copy_from_user(&info, arg, sizeof(info)))
1908 if (client->number != info.client)
1909 return -EINVAL; /* can't change other clients */
1911 if (info.output_pool >= 1 && info.output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1912 (! snd_seq_write_pool_allocated(client) ||
1913 info.output_pool != client->pool->size)) {
1914 if (snd_seq_write_pool_allocated(client)) {
1915 /* remove all existing cells */
1916 snd_seq_pool_mark_closing(client->pool);
1917 snd_seq_queue_client_leave_cells(client->number);
1918 snd_seq_pool_done(client->pool);
1920 client->pool->size = info.output_pool;
1921 rc = snd_seq_pool_init(client->pool);
1925 if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
1926 info.input_pool >= 1 &&
1927 info.input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1928 info.input_pool != client->data.user.fifo_pool_size) {
1929 /* change pool size */
1930 rc = snd_seq_fifo_resize(client->data.user.fifo, info.input_pool);
1933 client->data.user.fifo_pool_size = info.input_pool;
1935 if (info.output_room >= 1 &&
1936 info.output_room <= client->pool->size) {
1937 client->pool->room = info.output_room;
1940 return snd_seq_ioctl_get_client_pool(client, arg);
1944 /* REMOVE_EVENTS ioctl() */
1945 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
1948 struct snd_seq_remove_events info;
1950 if (copy_from_user(&info, arg, sizeof(info)))
1954 * Input mostly not implemented XXX.
1956 if (info.remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1958 * No restrictions so for a user client we can clear
1961 if (client->type == USER_CLIENT && client->data.user.fifo)
1962 snd_seq_fifo_clear(client->data.user.fifo);
1965 if (info.remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1966 snd_seq_queue_remove_cells(client->number, &info);
1973 * get subscription info
1975 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
1979 struct snd_seq_client *sender = NULL;
1980 struct snd_seq_client_port *sport = NULL;
1981 struct snd_seq_port_subscribe subs;
1982 struct snd_seq_subscribers *p;
1984 if (copy_from_user(&subs, arg, sizeof(subs)))
1988 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1990 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1992 p = snd_seq_port_get_subscription(&sport->c_src, &subs.dest);
2001 snd_seq_port_unlock(sport);
2003 snd_seq_client_unlock(sender);
2005 if (copy_to_user(arg, &subs, sizeof(subs)))
2013 * get subscription info - check only its presence
2015 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client,
2018 int result = -ENXIO;
2019 struct snd_seq_client *cptr = NULL;
2020 struct snd_seq_client_port *port = NULL;
2021 struct snd_seq_query_subs subs;
2022 struct snd_seq_port_subs_info *group;
2023 struct list_head *p;
2026 if (copy_from_user(&subs, arg, sizeof(subs)))
2029 if ((cptr = snd_seq_client_use_ptr(subs.root.client)) == NULL)
2031 if ((port = snd_seq_port_use_ptr(cptr, subs.root.port)) == NULL)
2034 switch (subs.type) {
2035 case SNDRV_SEQ_QUERY_SUBS_READ:
2036 group = &port->c_src;
2038 case SNDRV_SEQ_QUERY_SUBS_WRITE:
2039 group = &port->c_dest;
2045 down_read(&group->list_mutex);
2046 /* search for the subscriber */
2047 subs.num_subs = group->count;
2050 list_for_each(p, &group->list_head) {
2051 if (i++ == subs.index) {
2053 struct snd_seq_subscribers *s;
2054 if (subs.type == SNDRV_SEQ_QUERY_SUBS_READ) {
2055 s = list_entry(p, struct snd_seq_subscribers, src_list);
2056 subs.addr = s->info.dest;
2058 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2059 subs.addr = s->info.sender;
2061 subs.flags = s->info.flags;
2062 subs.queue = s->info.queue;
2067 up_read(&group->list_mutex);
2071 snd_seq_port_unlock(port);
2073 snd_seq_client_unlock(cptr);
2075 if (copy_to_user(arg, &subs, sizeof(subs)))
2085 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
2088 struct snd_seq_client *cptr = NULL;
2089 struct snd_seq_client_info info;
2091 if (copy_from_user(&info, arg, sizeof(info)))
2094 /* search for next client */
2096 if (info.client < 0)
2098 for (; info.client < SNDRV_SEQ_MAX_CLIENTS; info.client++) {
2099 cptr = snd_seq_client_use_ptr(info.client);
2106 get_client_info(cptr, &info);
2107 snd_seq_client_unlock(cptr);
2109 if (copy_to_user(arg, &info, sizeof(info)))
2117 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
2120 struct snd_seq_client *cptr;
2121 struct snd_seq_client_port *port = NULL;
2122 struct snd_seq_port_info info;
2124 if (copy_from_user(&info, arg, sizeof(info)))
2126 cptr = snd_seq_client_use_ptr(info.addr.client);
2130 /* search for next port */
2132 port = snd_seq_port_query_nearest(cptr, &info);
2134 snd_seq_client_unlock(cptr);
2139 info.addr = port->addr;
2140 snd_seq_get_port_info(port, &info);
2141 snd_seq_port_unlock(port);
2142 snd_seq_client_unlock(cptr);
2144 if (copy_to_user(arg, &info, sizeof(info)))
2149 /* -------------------------------------------------------- */
2151 static struct seq_ioctl_table {
2153 int (*func)(struct snd_seq_client *client, void __user * arg);
2154 } ioctl_tables[] = {
2155 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2156 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2157 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2158 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2159 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2160 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2161 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2162 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2163 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2164 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2165 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2166 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2167 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2168 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2169 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2170 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2171 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2172 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2173 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2174 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2175 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2176 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2177 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2178 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2179 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2180 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2181 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2182 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2183 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2187 static int snd_seq_do_ioctl(struct snd_seq_client *client, unsigned int cmd,
2190 struct seq_ioctl_table *p;
2193 case SNDRV_SEQ_IOCTL_PVERSION:
2194 /* return sequencer version number */
2195 return put_user(SNDRV_SEQ_VERSION, (int __user *)arg) ? -EFAULT : 0;
2196 case SNDRV_SEQ_IOCTL_CLIENT_ID:
2197 /* return the id of this client */
2198 return put_user(client->number, (int __user *)arg) ? -EFAULT : 0;
2203 for (p = ioctl_tables; p->cmd; p++) {
2205 return p->func(client, arg);
2207 snd_printd("seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n",
2208 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2213 static long snd_seq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2215 struct snd_seq_client *client = file->private_data;
2217 if (snd_BUG_ON(!client))
2220 return snd_seq_do_ioctl(client, cmd, (void __user *) arg);
2223 #ifdef CONFIG_COMPAT
2224 #include "seq_compat.c"
2226 #define snd_seq_ioctl_compat NULL
2229 /* -------------------------------------------------------- */
2232 /* exported to kernel modules */
2233 int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
2234 const char *name_fmt, ...)
2236 struct snd_seq_client *client;
2239 if (snd_BUG_ON(in_interrupt()))
2242 if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD)
2244 if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
2247 if (mutex_lock_interruptible(®ister_mutex))
2248 return -ERESTARTSYS;
2251 client_index += SNDRV_SEQ_GLOBAL_CLIENTS
2252 + card->number * SNDRV_SEQ_CLIENTS_PER_CARD;
2253 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN)
2257 /* empty write queue as default */
2258 client = seq_create_client1(client_index, 0);
2259 if (client == NULL) {
2260 mutex_unlock(®ister_mutex);
2261 return -EBUSY; /* failure code */
2263 usage_alloc(&client_usage, 1);
2265 client->accept_input = 1;
2266 client->accept_output = 1;
2268 va_start(args, name_fmt);
2269 vsnprintf(client->name, sizeof(client->name), name_fmt, args);
2272 client->type = KERNEL_CLIENT;
2273 mutex_unlock(®ister_mutex);
2275 /* make others aware this new client */
2276 snd_seq_system_client_ev_client_start(client->number);
2278 /* return client number to caller */
2279 return client->number;
2282 EXPORT_SYMBOL(snd_seq_create_kernel_client);
2284 /* exported to kernel modules */
2285 int snd_seq_delete_kernel_client(int client)
2287 struct snd_seq_client *ptr;
2289 if (snd_BUG_ON(in_interrupt()))
2292 ptr = clientptr(client);
2296 seq_free_client(ptr);
2301 EXPORT_SYMBOL(snd_seq_delete_kernel_client);
2303 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue
2304 * and snd_seq_kernel_client_enqueue_blocking
2306 static int kernel_client_enqueue(int client, struct snd_seq_event *ev,
2307 struct file *file, int blocking,
2308 int atomic, int hop)
2310 struct snd_seq_client *cptr;
2313 if (snd_BUG_ON(!ev))
2316 if (ev->type == SNDRV_SEQ_EVENT_NONE)
2317 return 0; /* ignore this */
2318 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2319 return -EINVAL; /* quoted events can't be enqueued */
2321 /* fill in client number */
2322 ev->source.client = client;
2324 if (check_event_type_and_length(ev))
2327 cptr = snd_seq_client_use_ptr(client);
2331 if (! cptr->accept_output)
2334 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, atomic, hop);
2336 snd_seq_client_unlock(cptr);
2341 * exported, called by kernel clients to enqueue events (w/o blocking)
2343 * RETURN VALUE: zero if succeed, negative if error
2345 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev,
2346 int atomic, int hop)
2348 return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop);
2351 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
2354 * exported, called by kernel clients to enqueue events (with blocking)
2356 * RETURN VALUE: zero if succeed, negative if error
2358 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev,
2360 int atomic, int hop)
2362 return kernel_client_enqueue(client, ev, file, 1, atomic, hop);
2365 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking);
2368 * exported, called by kernel clients to dispatch events directly to other
2369 * clients, bypassing the queues. Event time-stamp will be updated.
2371 * RETURN VALUE: negative = delivery failed,
2372 * zero, or positive: the number of delivered events
2374 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev,
2375 int atomic, int hop)
2377 struct snd_seq_client *cptr;
2380 if (snd_BUG_ON(!ev))
2383 /* fill in client number */
2384 ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2385 ev->source.client = client;
2387 if (check_event_type_and_length(ev))
2390 cptr = snd_seq_client_use_ptr(client);
2394 if (!cptr->accept_output)
2397 result = snd_seq_deliver_event(cptr, ev, atomic, hop);
2399 snd_seq_client_unlock(cptr);
2403 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch);
2406 * exported, called by kernel clients to perform same functions as with
2409 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2411 struct snd_seq_client *client;
2415 client = clientptr(clientid);
2418 fs = snd_enter_user();
2419 result = snd_seq_do_ioctl(client, cmd, (void __force __user *)arg);
2424 EXPORT_SYMBOL(snd_seq_kernel_client_ctl);
2426 /* exported (for OSS emulator) */
2427 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2429 struct snd_seq_client *client;
2431 client = clientptr(clientid);
2435 if (! snd_seq_write_pool_allocated(client))
2437 if (snd_seq_pool_poll_wait(client->pool, file, wait))
2442 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll);
2444 /*---------------------------------------------------------------------------*/
2446 #ifdef CONFIG_PROC_FS
2450 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer,
2451 struct snd_seq_port_subs_info *group,
2452 int is_src, char *msg)
2454 struct list_head *p;
2455 struct snd_seq_subscribers *s;
2458 down_read(&group->list_mutex);
2459 if (list_empty(&group->list_head)) {
2460 up_read(&group->list_mutex);
2463 snd_iprintf(buffer, msg);
2464 list_for_each(p, &group->list_head) {
2466 s = list_entry(p, struct snd_seq_subscribers, src_list);
2468 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2470 snd_iprintf(buffer, ", ");
2471 snd_iprintf(buffer, "%d:%d",
2472 is_src ? s->info.dest.client : s->info.sender.client,
2473 is_src ? s->info.dest.port : s->info.sender.port);
2474 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
2475 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
2476 if (group->exclusive)
2477 snd_iprintf(buffer, "[ex]");
2479 up_read(&group->list_mutex);
2480 snd_iprintf(buffer, "\n");
2483 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
2484 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
2485 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
2487 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2489 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
2490 struct snd_seq_client *client)
2492 struct snd_seq_client_port *p;
2494 mutex_lock(&client->ports_mutex);
2495 list_for_each_entry(p, &client->ports_list_head, list) {
2496 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c)\n",
2497 p->addr.port, p->name,
2498 FLAG_PERM_RD(p->capability),
2499 FLAG_PERM_WR(p->capability),
2500 FLAG_PERM_EX(p->capability),
2501 FLAG_PERM_DUPLEX(p->capability));
2502 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: ");
2503 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: ");
2505 mutex_unlock(&client->ports_mutex);
2509 /* exported to seq_info.c */
2510 void snd_seq_info_clients_read(struct snd_info_entry *entry,
2511 struct snd_info_buffer *buffer)
2514 struct snd_seq_client *client;
2516 snd_iprintf(buffer, "Client info\n");
2517 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur);
2518 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak);
2519 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
2520 snd_iprintf(buffer, "\n");
2522 /* list the client table */
2523 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2524 client = snd_seq_client_use_ptr(c);
2527 if (client->type == NO_CLIENT) {
2528 snd_seq_client_unlock(client);
2532 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n",
2534 client->type == USER_CLIENT ? "User" : "Kernel");
2535 snd_seq_info_dump_ports(buffer, client);
2536 if (snd_seq_write_pool_allocated(client)) {
2537 snd_iprintf(buffer, " Output pool :\n");
2538 snd_seq_info_pool(buffer, client->pool, " ");
2540 if (client->type == USER_CLIENT && client->data.user.fifo &&
2541 client->data.user.fifo->pool) {
2542 snd_iprintf(buffer, " Input pool :\n");
2543 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " ");
2545 snd_seq_client_unlock(client);
2548 #endif /* CONFIG_PROC_FS */
2550 /*---------------------------------------------------------------------------*/
2557 static const struct file_operations snd_seq_f_ops =
2559 .owner = THIS_MODULE,
2560 .read = snd_seq_read,
2561 .write = snd_seq_write,
2562 .open = snd_seq_open,
2563 .release = snd_seq_release,
2564 .llseek = no_llseek,
2565 .poll = snd_seq_poll,
2566 .unlocked_ioctl = snd_seq_ioctl,
2567 .compat_ioctl = snd_seq_ioctl_compat,
2571 * register sequencer device
2573 int __init snd_sequencer_device_init(void)
2577 if (mutex_lock_interruptible(®ister_mutex))
2578 return -ERESTARTSYS;
2580 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
2581 &snd_seq_f_ops, NULL, "seq")) < 0) {
2582 mutex_unlock(®ister_mutex);
2586 mutex_unlock(®ister_mutex);
2594 * unregister sequencer device
2596 void __exit snd_sequencer_device_done(void)
2598 snd_unregister_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0);