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);
239 mutex_init(&client->ioctl_mutex);
241 /* find free slot in the client table */
242 spin_lock_irqsave(&clients_lock, flags);
243 if (client_index < 0) {
244 for (c = SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN;
245 c < SNDRV_SEQ_MAX_CLIENTS;
247 if (clienttab[c] || clienttablock[c])
249 clienttab[client->number = c] = client;
250 spin_unlock_irqrestore(&clients_lock, flags);
254 if (clienttab[client_index] == NULL && !clienttablock[client_index]) {
255 clienttab[client->number = client_index] = client;
256 spin_unlock_irqrestore(&clients_lock, flags);
260 spin_unlock_irqrestore(&clients_lock, flags);
261 snd_seq_pool_delete(&client->pool);
263 return NULL; /* no free slot found or busy, return failure code */
267 static int seq_free_client1(struct snd_seq_client *client)
273 snd_seq_delete_all_ports(client);
274 snd_seq_queue_client_leave(client->number);
275 spin_lock_irqsave(&clients_lock, flags);
276 clienttablock[client->number] = 1;
277 clienttab[client->number] = NULL;
278 spin_unlock_irqrestore(&clients_lock, flags);
279 snd_use_lock_sync(&client->use_lock);
280 snd_seq_queue_client_termination(client->number);
282 snd_seq_pool_delete(&client->pool);
283 spin_lock_irqsave(&clients_lock, flags);
284 clienttablock[client->number] = 0;
285 spin_unlock_irqrestore(&clients_lock, flags);
290 static void seq_free_client(struct snd_seq_client * client)
292 mutex_lock(®ister_mutex);
293 switch (client->type) {
295 snd_printk(KERN_WARNING "Seq: Trying to free unused client %d\n",
300 seq_free_client1(client);
301 usage_free(&client_usage, 1);
305 snd_printk(KERN_ERR "Seq: Trying to free client %d with undefined type = %d\n",
306 client->number, client->type);
308 mutex_unlock(®ister_mutex);
310 snd_seq_system_client_ev_client_exit(client->number);
315 /* -------------------------------------------------------- */
317 /* create a user client */
318 static int snd_seq_open(struct inode *inode, struct file *file)
320 int c, mode; /* client id */
321 struct snd_seq_client *client;
322 struct snd_seq_user_client *user;
325 err = nonseekable_open(inode, file);
329 if (mutex_lock_interruptible(®ister_mutex))
331 client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS);
332 if (client == NULL) {
333 mutex_unlock(®ister_mutex);
334 return -ENOMEM; /* failure code */
337 mode = snd_seq_file_flags(file);
338 if (mode & SNDRV_SEQ_LFLG_INPUT)
339 client->accept_input = 1;
340 if (mode & SNDRV_SEQ_LFLG_OUTPUT)
341 client->accept_output = 1;
343 user = &client->data.user;
345 user->fifo_pool_size = 0;
347 if (mode & SNDRV_SEQ_LFLG_INPUT) {
348 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS;
349 user->fifo = snd_seq_fifo_new(user->fifo_pool_size);
350 if (user->fifo == NULL) {
351 seq_free_client1(client);
353 mutex_unlock(®ister_mutex);
358 usage_alloc(&client_usage, 1);
359 client->type = USER_CLIENT;
360 mutex_unlock(®ister_mutex);
363 file->private_data = client;
365 /* fill client data */
367 sprintf(client->name, "Client-%d", c);
369 /* make others aware this new client */
370 snd_seq_system_client_ev_client_start(c);
375 /* delete a user client */
376 static int snd_seq_release(struct inode *inode, struct file *file)
378 struct snd_seq_client *client = file->private_data;
381 seq_free_client(client);
382 if (client->data.user.fifo)
383 snd_seq_fifo_delete(&client->data.user.fifo);
391 /* handle client read() */
392 /* possible error values:
393 * -ENXIO invalid client or file open mode
394 * -ENOSPC FIFO overflow (the flag is cleared after this error report)
395 * -EINVAL no enough user-space buffer to write the whole event
396 * -EFAULT seg. fault during copy to user space
398 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count,
401 struct snd_seq_client *client = file->private_data;
402 struct snd_seq_fifo *fifo;
405 struct snd_seq_event_cell *cell;
407 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT))
410 if (!access_ok(VERIFY_WRITE, buf, count))
413 /* check client structures are in place */
414 if (snd_BUG_ON(!client))
417 if (!client->accept_input || (fifo = client->data.user.fifo) == NULL)
420 if (atomic_read(&fifo->overflow) > 0) {
421 /* buffer overflow is detected */
422 snd_seq_fifo_clear(fifo);
423 /* return error code */
429 snd_seq_fifo_lock(fifo);
431 /* while data available in queue */
432 while (count >= sizeof(struct snd_seq_event)) {
435 nonblock = (file->f_flags & O_NONBLOCK) || result > 0;
436 if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) {
439 if (snd_seq_ev_is_variable(&cell->event)) {
440 struct snd_seq_event tmpev;
442 tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
443 if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) {
447 count -= sizeof(struct snd_seq_event);
448 buf += sizeof(struct snd_seq_event);
449 err = snd_seq_expand_var_event(&cell->event, count,
450 (char __force *)buf, 0,
451 sizeof(struct snd_seq_event));
458 if (copy_to_user(buf, &cell->event, sizeof(struct snd_seq_event))) {
462 count -= sizeof(struct snd_seq_event);
463 buf += sizeof(struct snd_seq_event);
465 snd_seq_cell_free(cell);
466 cell = NULL; /* to be sure */
467 result += sizeof(struct snd_seq_event);
472 snd_seq_fifo_cell_putback(fifo, cell);
473 if (err == -EAGAIN && result > 0)
476 snd_seq_fifo_unlock(fifo);
478 return (err < 0) ? err : result;
483 * check access permission to the port
485 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags)
487 if ((port->capability & flags) != flags)
493 * check if the destination client is available, and return the pointer
494 * if filter is non-zero, client filter bitmap is tested.
496 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event,
499 struct snd_seq_client *dest;
501 dest = snd_seq_client_use_ptr(event->dest.client);
504 if (! dest->accept_input)
506 if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) &&
507 ! test_bit(event->type, dest->event_filter))
509 if (filter && !(dest->filter & filter))
512 return dest; /* ok - accessible */
514 snd_seq_client_unlock(dest);
520 * Return the error event.
522 * If the receiver client is a user client, the original event is
523 * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event. If
524 * the original event is also variable length, the external data is
525 * copied after the event record.
526 * If the receiver client is a kernel client, the original event is
527 * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra
530 static int bounce_error_event(struct snd_seq_client *client,
531 struct snd_seq_event *event,
532 int err, int atomic, int hop)
534 struct snd_seq_event bounce_ev;
537 if (client == NULL ||
538 ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) ||
539 ! client->accept_input)
540 return 0; /* ignored */
542 /* set up quoted error */
543 memset(&bounce_ev, 0, sizeof(bounce_ev));
544 bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR;
545 bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED;
546 bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT;
547 bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
548 bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
549 bounce_ev.dest.client = client->number;
550 bounce_ev.dest.port = event->source.port;
551 bounce_ev.data.quote.origin = event->dest;
552 bounce_ev.data.quote.event = event;
553 bounce_ev.data.quote.value = -err; /* use positive value */
554 result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1);
556 client->event_lost++;
565 * rewrite the time-stamp of the event record with the curren time
566 * of the given queue.
567 * return non-zero if updated.
569 static int update_timestamp_of_queue(struct snd_seq_event *event,
570 int queue, int real_time)
572 struct snd_seq_queue *q;
577 event->queue = queue;
578 event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK;
580 event->time.time = snd_seq_timer_get_cur_time(q->timer);
581 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL;
583 event->time.tick = snd_seq_timer_get_cur_tick(q->timer);
584 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK;
592 * deliver an event to the specified destination.
593 * if filter is non-zero, client filter bitmap is tested.
595 * RETURN VALUE: 0 : if succeeded
598 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
599 struct snd_seq_event *event,
600 int filter, int atomic, int hop)
602 struct snd_seq_client *dest = NULL;
603 struct snd_seq_client_port *dest_port = NULL;
604 int result = -ENOENT;
607 direct = snd_seq_ev_is_direct(event);
609 dest = get_event_dest_client(event, filter);
612 dest_port = snd_seq_port_use_ptr(dest, event->dest.port);
613 if (dest_port == NULL)
616 /* check permission */
617 if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) {
622 if (dest_port->timestamping)
623 update_timestamp_of_queue(event, dest_port->time_queue,
624 dest_port->time_real);
626 switch (dest->type) {
628 if (dest->data.user.fifo)
629 result = snd_seq_fifo_event_in(dest->data.user.fifo, event);
633 if (dest_port->event_input == NULL)
635 result = dest_port->event_input(event, direct,
636 dest_port->private_data,
645 snd_seq_port_unlock(dest_port);
647 snd_seq_client_unlock(dest);
649 if (result < 0 && !direct) {
650 result = bounce_error_event(client, event, result, atomic, hop);
657 * send the event to all subscribers:
659 static int deliver_to_subscribers(struct snd_seq_client *client,
660 struct snd_seq_event *event,
663 struct snd_seq_subscribers *subs;
664 int err = 0, num_ev = 0;
665 struct snd_seq_event event_saved;
666 struct snd_seq_client_port *src_port;
667 struct snd_seq_port_subs_info *grp;
669 src_port = snd_seq_port_use_ptr(client, event->source.port);
670 if (src_port == NULL)
671 return -EINVAL; /* invalid source port */
672 /* save original event record */
673 event_saved = *event;
674 grp = &src_port->c_src;
678 read_lock(&grp->list_lock);
680 down_read_nested(&grp->list_mutex, hop);
681 list_for_each_entry(subs, &grp->list_head, src_list) {
682 /* both ports ready? */
683 if (atomic_read(&subs->ref_count) != 2)
685 event->dest = subs->info.dest;
686 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
687 /* convert time according to flag with subscription */
688 update_timestamp_of_queue(event, subs->info.queue,
689 subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL);
690 err = snd_seq_deliver_single_event(client, event,
695 /* restore original event record */
696 *event = event_saved;
699 read_unlock(&grp->list_lock);
701 up_read(&grp->list_mutex);
702 *event = event_saved; /* restore */
703 snd_seq_port_unlock(src_port);
704 return (err < 0) ? err : num_ev;
708 #ifdef SUPPORT_BROADCAST
710 * broadcast to all ports:
712 static int port_broadcast_event(struct snd_seq_client *client,
713 struct snd_seq_event *event,
716 int num_ev = 0, err = 0;
717 struct snd_seq_client *dest_client;
718 struct snd_seq_client_port *port;
720 dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST);
721 if (dest_client == NULL)
722 return 0; /* no matching destination */
724 read_lock(&dest_client->ports_lock);
725 list_for_each_entry(port, &dest_client->ports_list_head, list) {
726 event->dest.port = port->addr.port;
727 /* pass NULL as source client to avoid error bounce */
728 err = snd_seq_deliver_single_event(NULL, event,
729 SNDRV_SEQ_FILTER_BROADCAST,
735 read_unlock(&dest_client->ports_lock);
736 snd_seq_client_unlock(dest_client);
737 event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */
738 return (err < 0) ? err : num_ev;
742 * send the event to all clients:
743 * if destination port is also ADDRESS_BROADCAST, deliver to all ports.
745 static int broadcast_event(struct snd_seq_client *client,
746 struct snd_seq_event *event, int atomic, int hop)
748 int err = 0, num_ev = 0;
750 struct snd_seq_addr addr;
752 addr = event->dest; /* save */
754 for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) {
755 /* don't send to itself */
756 if (dest == client->number)
758 event->dest.client = dest;
759 event->dest.port = addr.port;
760 if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST)
761 err = port_broadcast_event(client, event, atomic, hop);
763 /* pass NULL as source client to avoid error bounce */
764 err = snd_seq_deliver_single_event(NULL, event,
765 SNDRV_SEQ_FILTER_BROADCAST,
771 event->dest = addr; /* restore */
772 return (err < 0) ? err : num_ev;
776 /* multicast - not supported yet */
777 static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event,
780 snd_printd("seq: multicast not supported yet.\n");
781 return 0; /* ignored */
783 #endif /* SUPPORT_BROADCAST */
786 /* deliver an event to the destination port(s).
787 * if the event is to subscribers or broadcast, the event is dispatched
788 * to multiple targets.
790 * RETURN VALUE: n > 0 : the number of delivered events.
791 * n == 0 : the event was not passed to any client.
792 * n < 0 : error - event was not processed.
794 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event,
800 if (hop >= SNDRV_SEQ_MAX_HOPS) {
801 snd_printd("too long delivery path (%d:%d->%d:%d)\n",
802 event->source.client, event->source.port,
803 event->dest.client, event->dest.port);
807 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS ||
808 event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS)
809 result = deliver_to_subscribers(client, event, atomic, hop);
810 #ifdef SUPPORT_BROADCAST
811 else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST ||
812 event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST)
813 result = broadcast_event(client, event, atomic, hop);
814 else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS)
815 result = multicast_event(client, event, atomic, hop);
816 else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST)
817 result = port_broadcast_event(client, event, atomic, hop);
820 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop);
826 * dispatch an event cell:
827 * This function is called only from queue check routines in timer
828 * interrupts or after enqueued.
829 * The event cell shall be released or re-queued in this function.
831 * RETURN VALUE: n > 0 : the number of delivered events.
832 * n == 0 : the event was not passed to any client.
833 * n < 0 : error - event was not processed.
835 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop)
837 struct snd_seq_client *client;
840 if (snd_BUG_ON(!cell))
843 client = snd_seq_client_use_ptr(cell->event.source.client);
844 if (client == NULL) {
845 snd_seq_cell_free(cell); /* release this cell */
849 if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) {
851 * the event cell is re-used as a NOTE-OFF event and
854 struct snd_seq_event tmpev, *ev;
856 /* reserve this event to enqueue note-off later */
858 tmpev.type = SNDRV_SEQ_EVENT_NOTEON;
859 result = snd_seq_deliver_event(client, &tmpev, atomic, hop);
862 * This was originally a note event. We now re-use the
863 * cell for the note-off event.
867 ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
868 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH;
870 /* add the duration time */
871 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) {
872 case SNDRV_SEQ_TIME_STAMP_TICK:
873 ev->time.tick += ev->data.note.duration;
875 case SNDRV_SEQ_TIME_STAMP_REAL:
876 /* unit for duration is ms */
877 ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000);
878 ev->time.time.tv_sec += ev->data.note.duration / 1000 +
879 ev->time.time.tv_nsec / 1000000000;
880 ev->time.time.tv_nsec %= 1000000000;
883 ev->data.note.velocity = ev->data.note.off_velocity;
885 /* Now queue this cell as the note off event */
886 if (snd_seq_enqueue_event(cell, atomic, hop) < 0)
887 snd_seq_cell_free(cell); /* release this cell */
891 * event cell is freed after processing the event
894 result = snd_seq_deliver_event(client, &cell->event, atomic, hop);
895 snd_seq_cell_free(cell);
898 snd_seq_client_unlock(client);
903 /* Allocate a cell from client pool and enqueue it to queue:
904 * if pool is empty and blocking is TRUE, sleep until a new cell is
907 static int snd_seq_client_enqueue_event(struct snd_seq_client *client,
908 struct snd_seq_event *event,
909 struct file *file, int blocking,
912 struct snd_seq_event_cell *cell;
915 /* special queue values - force direct passing */
916 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
917 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
918 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
920 #ifdef SUPPORT_BROADCAST
921 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) {
922 event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST;
923 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
926 if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
927 /* check presence of source port */
928 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port);
929 if (src_port == NULL)
931 snd_seq_port_unlock(src_port);
934 /* direct event processing without enqueued */
935 if (snd_seq_ev_is_direct(event)) {
936 if (event->type == SNDRV_SEQ_EVENT_NOTE)
937 return -EINVAL; /* this event must be enqueued! */
938 return snd_seq_deliver_event(client, event, atomic, hop);
941 /* Not direct, normal queuing */
942 if (snd_seq_queue_is_used(event->queue, client->number) <= 0)
943 return -EINVAL; /* invalid queue */
944 if (! snd_seq_write_pool_allocated(client))
945 return -ENXIO; /* queue is not allocated */
947 /* allocate an event cell */
948 err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, file);
952 /* we got a cell. enqueue it. */
953 if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
954 snd_seq_cell_free(cell);
963 * check validity of event type and data length.
964 * return non-zero if invalid.
966 static int check_event_type_and_length(struct snd_seq_event *ev)
968 switch (snd_seq_ev_length_type(ev)) {
969 case SNDRV_SEQ_EVENT_LENGTH_FIXED:
970 if (snd_seq_ev_is_variable_type(ev))
973 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
974 if (! snd_seq_ev_is_variable_type(ev) ||
975 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
978 case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
979 if (! snd_seq_ev_is_direct(ev))
988 /* possible error values:
989 * -ENXIO invalid client or file open mode
990 * -ENOMEM malloc failed
991 * -EFAULT seg. fault during copy from user space
992 * -EINVAL invalid event
993 * -EAGAIN no space in output pool
994 * -EINTR interrupts while sleep
995 * -EMLINK too many hops
996 * others depends on return value from driver callback
998 static ssize_t snd_seq_write(struct file *file, const char __user *buf,
999 size_t count, loff_t *offset)
1001 struct snd_seq_client *client = file->private_data;
1002 int written = 0, len;
1004 struct snd_seq_event event;
1006 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
1009 /* check client structures are in place */
1010 if (snd_BUG_ON(!client))
1013 if (!client->accept_output || client->pool == NULL)
1016 /* allocate the pool now if the pool is not allocated yet */
1017 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
1018 if (snd_seq_pool_init(client->pool) < 0)
1022 /* only process whole events */
1023 while (count >= sizeof(struct snd_seq_event)) {
1024 /* Read in the event header from the user */
1025 len = sizeof(event);
1026 if (copy_from_user(&event, buf, len)) {
1030 event.source.client = client->number; /* fill in client number */
1031 /* Check for extension data length */
1032 if (check_event_type_and_length(&event)) {
1037 /* check for special events */
1038 if (event.type == SNDRV_SEQ_EVENT_NONE)
1040 else if (snd_seq_ev_is_reserved(&event)) {
1045 if (snd_seq_ev_is_variable(&event)) {
1046 int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK;
1047 if ((size_t)(extlen + len) > count) {
1048 /* back out, will get an error this time or next */
1052 /* set user space pointer */
1053 event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
1054 event.data.ext.ptr = (char __force *)buf
1055 + sizeof(struct snd_seq_event);
1056 len += extlen; /* increment data length */
1058 #ifdef CONFIG_COMPAT
1059 if (client->convert32 && snd_seq_ev_is_varusr(&event)) {
1060 void *ptr = (void __force *)compat_ptr(event.data.raw32.d[1]);
1061 event.data.ext.ptr = ptr;
1066 /* ok, enqueue it */
1067 err = snd_seq_client_enqueue_event(client, &event, file,
1068 !(file->f_flags & O_NONBLOCK),
1074 /* Update pointers and counts */
1080 return written ? written : err;
1087 static unsigned int snd_seq_poll(struct file *file, poll_table * wait)
1089 struct snd_seq_client *client = file->private_data;
1090 unsigned int mask = 0;
1092 /* check client structures are in place */
1093 if (snd_BUG_ON(!client))
1096 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1097 client->data.user.fifo) {
1099 /* check if data is available in the outqueue */
1100 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
1101 mask |= POLLIN | POLLRDNORM;
1104 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1106 /* check if data is available in the pool */
1107 if (!snd_seq_write_pool_allocated(client) ||
1108 snd_seq_pool_poll_wait(client->pool, file, wait))
1109 mask |= POLLOUT | POLLWRNORM;
1116 /*-----------------------------------------------------*/
1119 /* SYSTEM_INFO ioctl() */
1120 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void __user *arg)
1122 struct snd_seq_system_info info;
1124 memset(&info, 0, sizeof(info));
1125 /* fill the info fields */
1126 info.queues = SNDRV_SEQ_MAX_QUEUES;
1127 info.clients = SNDRV_SEQ_MAX_CLIENTS;
1128 info.ports = 256; /* fixed limit */
1129 info.channels = 256; /* fixed limit */
1130 info.cur_clients = client_usage.cur;
1131 info.cur_queues = snd_seq_queue_get_cur_queues();
1133 if (copy_to_user(arg, &info, sizeof(info)))
1139 /* RUNNING_MODE ioctl() */
1140 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void __user *arg)
1142 struct snd_seq_running_info info;
1143 struct snd_seq_client *cptr;
1146 if (copy_from_user(&info, arg, sizeof(info)))
1149 /* requested client number */
1150 cptr = snd_seq_client_use_ptr(info.client);
1152 return -ENOENT; /* don't change !!! */
1154 #ifdef SNDRV_BIG_ENDIAN
1155 if (! info.big_endian) {
1160 if (info.big_endian) {
1166 if (info.cpu_mode > sizeof(long)) {
1170 cptr->convert32 = (info.cpu_mode < sizeof(long));
1172 snd_seq_client_unlock(cptr);
1176 /* CLIENT_INFO ioctl() */
1177 static void get_client_info(struct snd_seq_client *cptr,
1178 struct snd_seq_client_info *info)
1180 info->client = cptr->number;
1182 /* fill the info fields */
1183 info->type = cptr->type;
1184 strcpy(info->name, cptr->name);
1185 info->filter = cptr->filter;
1186 info->event_lost = cptr->event_lost;
1187 memcpy(info->event_filter, cptr->event_filter, 32);
1188 info->num_ports = cptr->num_ports;
1189 memset(info->reserved, 0, sizeof(info->reserved));
1192 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
1195 struct snd_seq_client *cptr;
1196 struct snd_seq_client_info client_info;
1198 if (copy_from_user(&client_info, arg, sizeof(client_info)))
1201 /* requested client number */
1202 cptr = snd_seq_client_use_ptr(client_info.client);
1204 return -ENOENT; /* don't change !!! */
1206 get_client_info(cptr, &client_info);
1207 snd_seq_client_unlock(cptr);
1209 if (copy_to_user(arg, &client_info, sizeof(client_info)))
1215 /* CLIENT_INFO ioctl() */
1216 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
1219 struct snd_seq_client_info client_info;
1221 if (copy_from_user(&client_info, arg, sizeof(client_info)))
1224 /* it is not allowed to set the info fields for an another client */
1225 if (client->number != client_info.client)
1227 /* also client type must be set now */
1228 if (client->type != client_info.type)
1231 /* fill the info fields */
1232 if (client_info.name[0])
1233 strlcpy(client->name, client_info.name, sizeof(client->name));
1235 client->filter = client_info.filter;
1236 client->event_lost = client_info.event_lost;
1237 memcpy(client->event_filter, client_info.event_filter, 32);
1244 * CREATE PORT ioctl()
1246 static int snd_seq_ioctl_create_port(struct snd_seq_client *client,
1249 struct snd_seq_client_port *port;
1250 struct snd_seq_port_info info;
1251 struct snd_seq_port_callback *callback;
1254 if (copy_from_user(&info, arg, sizeof(info)))
1257 /* it is not allowed to create the port for an another client */
1258 if (info.addr.client != client->number)
1261 port = snd_seq_create_port(client, (info.flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info.addr.port : -1);
1265 if (client->type == USER_CLIENT && info.kernel) {
1266 port_idx = port->addr.port;
1267 snd_seq_port_unlock(port);
1268 snd_seq_delete_port(client, port_idx);
1271 if (client->type == KERNEL_CLIENT) {
1272 if ((callback = info.kernel) != NULL) {
1273 if (callback->owner)
1274 port->owner = callback->owner;
1275 port->private_data = callback->private_data;
1276 port->private_free = callback->private_free;
1277 port->callback_all = callback->callback_all;
1278 port->event_input = callback->event_input;
1279 port->c_src.open = callback->subscribe;
1280 port->c_src.close = callback->unsubscribe;
1281 port->c_dest.open = callback->use;
1282 port->c_dest.close = callback->unuse;
1286 info.addr = port->addr;
1288 snd_seq_set_port_info(port, &info);
1289 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1290 snd_seq_port_unlock(port);
1292 if (copy_to_user(arg, &info, sizeof(info)))
1299 * DELETE PORT ioctl()
1301 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client,
1304 struct snd_seq_port_info info;
1307 /* set passed parameters */
1308 if (copy_from_user(&info, arg, sizeof(info)))
1311 /* it is not allowed to remove the port for an another client */
1312 if (info.addr.client != client->number)
1315 err = snd_seq_delete_port(client, info.addr.port);
1317 snd_seq_system_client_ev_port_exit(client->number, info.addr.port);
1323 * GET_PORT_INFO ioctl() (on any client)
1325 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client,
1328 struct snd_seq_client *cptr;
1329 struct snd_seq_client_port *port;
1330 struct snd_seq_port_info info;
1332 if (copy_from_user(&info, arg, sizeof(info)))
1334 cptr = snd_seq_client_use_ptr(info.addr.client);
1338 port = snd_seq_port_use_ptr(cptr, info.addr.port);
1340 snd_seq_client_unlock(cptr);
1341 return -ENOENT; /* don't change */
1345 snd_seq_get_port_info(port, &info);
1346 snd_seq_port_unlock(port);
1347 snd_seq_client_unlock(cptr);
1349 if (copy_to_user(arg, &info, sizeof(info)))
1356 * SET_PORT_INFO ioctl() (only ports on this/own client)
1358 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client,
1361 struct snd_seq_client_port *port;
1362 struct snd_seq_port_info info;
1364 if (copy_from_user(&info, arg, sizeof(info)))
1367 if (info.addr.client != client->number) /* only set our own ports ! */
1369 port = snd_seq_port_use_ptr(client, info.addr.port);
1371 snd_seq_set_port_info(port, &info);
1372 snd_seq_port_unlock(port);
1379 * port subscription (connection)
1381 #define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1382 #define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1384 static int check_subscription_permission(struct snd_seq_client *client,
1385 struct snd_seq_client_port *sport,
1386 struct snd_seq_client_port *dport,
1387 struct snd_seq_port_subscribe *subs)
1389 if (client->number != subs->sender.client &&
1390 client->number != subs->dest.client) {
1391 /* connection by third client - check export permission */
1392 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1394 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1398 /* check read permission */
1399 /* if sender or receiver is the subscribing client itself,
1400 * no permission check is necessary
1402 if (client->number != subs->sender.client) {
1403 if (! check_port_perm(sport, PERM_RD))
1406 /* check write permission */
1407 if (client->number != subs->dest.client) {
1408 if (! check_port_perm(dport, PERM_WR))
1415 * send an subscription notify event to user client:
1416 * client must be user client.
1418 int snd_seq_client_notify_subscription(int client, int port,
1419 struct snd_seq_port_subscribe *info,
1422 struct snd_seq_event event;
1424 memset(&event, 0, sizeof(event));
1425 event.type = evtype;
1426 event.data.connect.dest = info->dest;
1427 event.data.connect.sender = info->sender;
1429 return snd_seq_system_notify(client, port, &event); /* non-atomic */
1434 * add to port's subscription list IOCTL interface
1436 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
1439 int result = -EINVAL;
1440 struct snd_seq_client *receiver = NULL, *sender = NULL;
1441 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1442 struct snd_seq_port_subscribe subs;
1444 if (copy_from_user(&subs, arg, sizeof(subs)))
1447 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1449 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1451 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1453 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1456 result = check_subscription_permission(client, sport, dport, &subs);
1461 result = snd_seq_port_connect(client, sender, sport, receiver, dport, &subs);
1462 if (! result) /* broadcast announce */
1463 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1464 &subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1467 snd_seq_port_unlock(sport);
1469 snd_seq_port_unlock(dport);
1471 snd_seq_client_unlock(sender);
1473 snd_seq_client_unlock(receiver);
1479 * remove from port's subscription list
1481 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
1484 int result = -ENXIO;
1485 struct snd_seq_client *receiver = NULL, *sender = NULL;
1486 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1487 struct snd_seq_port_subscribe subs;
1489 if (copy_from_user(&subs, arg, sizeof(subs)))
1492 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1494 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1496 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1498 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1501 result = check_subscription_permission(client, sport, dport, &subs);
1505 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, &subs);
1506 if (! result) /* broadcast announce */
1507 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1508 &subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1511 snd_seq_port_unlock(sport);
1513 snd_seq_port_unlock(dport);
1515 snd_seq_client_unlock(sender);
1517 snd_seq_client_unlock(receiver);
1522 /* CREATE_QUEUE ioctl() */
1523 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client,
1526 struct snd_seq_queue_info info;
1528 struct snd_seq_queue *q;
1530 if (copy_from_user(&info, arg, sizeof(info)))
1533 result = snd_seq_queue_alloc(client->number, info.locked, info.flags);
1537 q = queueptr(result);
1541 info.queue = q->queue;
1542 info.locked = q->locked;
1543 info.owner = q->owner;
1545 /* set queue name */
1547 snprintf(info.name, sizeof(info.name), "Queue-%d", q->queue);
1548 strlcpy(q->name, info.name, sizeof(q->name));
1551 if (copy_to_user(arg, &info, sizeof(info)))
1557 /* DELETE_QUEUE ioctl() */
1558 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client,
1561 struct snd_seq_queue_info info;
1563 if (copy_from_user(&info, arg, sizeof(info)))
1566 return snd_seq_queue_delete(client->number, info.queue);
1569 /* GET_QUEUE_INFO ioctl() */
1570 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client,
1573 struct snd_seq_queue_info info;
1574 struct snd_seq_queue *q;
1576 if (copy_from_user(&info, arg, sizeof(info)))
1579 q = queueptr(info.queue);
1583 memset(&info, 0, sizeof(info));
1584 info.queue = q->queue;
1585 info.owner = q->owner;
1586 info.locked = q->locked;
1587 strlcpy(info.name, q->name, sizeof(info.name));
1590 if (copy_to_user(arg, &info, sizeof(info)))
1596 /* SET_QUEUE_INFO ioctl() */
1597 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
1600 struct snd_seq_queue_info info;
1601 struct snd_seq_queue *q;
1603 if (copy_from_user(&info, arg, sizeof(info)))
1606 if (info.owner != client->number)
1609 /* change owner/locked permission */
1610 if (snd_seq_queue_check_access(info.queue, client->number)) {
1611 if (snd_seq_queue_set_owner(info.queue, client->number, info.locked) < 0)
1614 snd_seq_queue_use(info.queue, client->number, 1);
1619 q = queueptr(info.queue);
1622 if (q->owner != client->number) {
1626 strlcpy(q->name, info.name, sizeof(q->name));
1632 /* GET_NAMED_QUEUE ioctl() */
1633 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client, void __user *arg)
1635 struct snd_seq_queue_info info;
1636 struct snd_seq_queue *q;
1638 if (copy_from_user(&info, arg, sizeof(info)))
1641 q = snd_seq_queue_find_name(info.name);
1644 info.queue = q->queue;
1645 info.owner = q->owner;
1646 info.locked = q->locked;
1649 if (copy_to_user(arg, &info, sizeof(info)))
1655 /* GET_QUEUE_STATUS ioctl() */
1656 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
1659 struct snd_seq_queue_status status;
1660 struct snd_seq_queue *queue;
1661 struct snd_seq_timer *tmr;
1663 if (copy_from_user(&status, arg, sizeof(status)))
1666 queue = queueptr(status.queue);
1669 memset(&status, 0, sizeof(status));
1670 status.queue = queue->queue;
1673 status.events = queue->tickq->cells + queue->timeq->cells;
1675 status.time = snd_seq_timer_get_cur_time(tmr);
1676 status.tick = snd_seq_timer_get_cur_tick(tmr);
1678 status.running = tmr->running;
1680 status.flags = queue->flags;
1683 if (copy_to_user(arg, &status, sizeof(status)))
1689 /* GET_QUEUE_TEMPO ioctl() */
1690 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
1693 struct snd_seq_queue_tempo tempo;
1694 struct snd_seq_queue *queue;
1695 struct snd_seq_timer *tmr;
1697 if (copy_from_user(&tempo, arg, sizeof(tempo)))
1700 queue = queueptr(tempo.queue);
1703 memset(&tempo, 0, sizeof(tempo));
1704 tempo.queue = queue->queue;
1708 tempo.tempo = tmr->tempo;
1709 tempo.ppq = tmr->ppq;
1710 tempo.skew_value = tmr->skew;
1711 tempo.skew_base = tmr->skew_base;
1714 if (copy_to_user(arg, &tempo, sizeof(tempo)))
1720 /* SET_QUEUE_TEMPO ioctl() */
1721 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1723 if (!snd_seq_queue_check_access(tempo->queue, client))
1725 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1728 EXPORT_SYMBOL(snd_seq_set_queue_tempo);
1730 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
1734 struct snd_seq_queue_tempo tempo;
1736 if (copy_from_user(&tempo, arg, sizeof(tempo)))
1739 result = snd_seq_set_queue_tempo(client->number, &tempo);
1740 return result < 0 ? result : 0;
1744 /* GET_QUEUE_TIMER ioctl() */
1745 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
1748 struct snd_seq_queue_timer timer;
1749 struct snd_seq_queue *queue;
1750 struct snd_seq_timer *tmr;
1752 if (copy_from_user(&timer, arg, sizeof(timer)))
1755 queue = queueptr(timer.queue);
1759 if (mutex_lock_interruptible(&queue->timer_mutex)) {
1761 return -ERESTARTSYS;
1764 memset(&timer, 0, sizeof(timer));
1765 timer.queue = queue->queue;
1767 timer.type = tmr->type;
1768 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1769 timer.u.alsa.id = tmr->alsa_id;
1770 timer.u.alsa.resolution = tmr->preferred_resolution;
1772 mutex_unlock(&queue->timer_mutex);
1775 if (copy_to_user(arg, &timer, sizeof(timer)))
1781 /* SET_QUEUE_TIMER ioctl() */
1782 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
1786 struct snd_seq_queue_timer timer;
1788 if (copy_from_user(&timer, arg, sizeof(timer)))
1791 if (timer.type != SNDRV_SEQ_TIMER_ALSA)
1794 if (snd_seq_queue_check_access(timer.queue, client->number)) {
1795 struct snd_seq_queue *q;
1796 struct snd_seq_timer *tmr;
1798 q = queueptr(timer.queue);
1801 if (mutex_lock_interruptible(&q->timer_mutex)) {
1803 return -ERESTARTSYS;
1806 snd_seq_queue_timer_close(timer.queue);
1807 tmr->type = timer.type;
1808 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1809 tmr->alsa_id = timer.u.alsa.id;
1810 tmr->preferred_resolution = timer.u.alsa.resolution;
1812 result = snd_seq_queue_timer_open(timer.queue);
1813 mutex_unlock(&q->timer_mutex);
1823 /* GET_QUEUE_CLIENT ioctl() */
1824 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
1827 struct snd_seq_queue_client info;
1830 if (copy_from_user(&info, arg, sizeof(info)))
1833 used = snd_seq_queue_is_used(info.queue, client->number);
1837 info.client = client->number;
1839 if (copy_to_user(arg, &info, sizeof(info)))
1845 /* SET_QUEUE_CLIENT ioctl() */
1846 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
1850 struct snd_seq_queue_client info;
1852 if (copy_from_user(&info, arg, sizeof(info)))
1855 if (info.used >= 0) {
1856 err = snd_seq_queue_use(info.queue, client->number, info.used);
1861 return snd_seq_ioctl_get_queue_client(client, arg);
1865 /* GET_CLIENT_POOL ioctl() */
1866 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
1869 struct snd_seq_client_pool info;
1870 struct snd_seq_client *cptr;
1872 if (copy_from_user(&info, arg, sizeof(info)))
1875 cptr = snd_seq_client_use_ptr(info.client);
1878 memset(&info, 0, sizeof(info));
1879 info.output_pool = cptr->pool->size;
1880 info.output_room = cptr->pool->room;
1881 info.output_free = info.output_pool;
1882 info.output_free = snd_seq_unused_cells(cptr->pool);
1883 if (cptr->type == USER_CLIENT) {
1884 info.input_pool = cptr->data.user.fifo_pool_size;
1885 info.input_free = info.input_pool;
1886 if (cptr->data.user.fifo)
1887 info.input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool);
1889 info.input_pool = 0;
1890 info.input_free = 0;
1892 snd_seq_client_unlock(cptr);
1894 if (copy_to_user(arg, &info, sizeof(info)))
1899 /* SET_CLIENT_POOL ioctl() */
1900 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
1903 struct snd_seq_client_pool info;
1906 if (copy_from_user(&info, arg, sizeof(info)))
1909 if (client->number != info.client)
1910 return -EINVAL; /* can't change other clients */
1912 if (info.output_pool >= 1 && info.output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1913 (! snd_seq_write_pool_allocated(client) ||
1914 info.output_pool != client->pool->size)) {
1915 if (snd_seq_write_pool_allocated(client)) {
1916 /* remove all existing cells */
1917 snd_seq_pool_mark_closing(client->pool);
1918 snd_seq_queue_client_leave_cells(client->number);
1919 snd_seq_pool_done(client->pool);
1921 client->pool->size = info.output_pool;
1922 rc = snd_seq_pool_init(client->pool);
1926 if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
1927 info.input_pool >= 1 &&
1928 info.input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1929 info.input_pool != client->data.user.fifo_pool_size) {
1930 /* change pool size */
1931 rc = snd_seq_fifo_resize(client->data.user.fifo, info.input_pool);
1934 client->data.user.fifo_pool_size = info.input_pool;
1936 if (info.output_room >= 1 &&
1937 info.output_room <= client->pool->size) {
1938 client->pool->room = info.output_room;
1941 return snd_seq_ioctl_get_client_pool(client, arg);
1945 /* REMOVE_EVENTS ioctl() */
1946 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
1949 struct snd_seq_remove_events info;
1951 if (copy_from_user(&info, arg, sizeof(info)))
1955 * Input mostly not implemented XXX.
1957 if (info.remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1959 * No restrictions so for a user client we can clear
1962 if (client->type == USER_CLIENT && client->data.user.fifo)
1963 snd_seq_fifo_clear(client->data.user.fifo);
1966 if (info.remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1967 snd_seq_queue_remove_cells(client->number, &info);
1974 * get subscription info
1976 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
1980 struct snd_seq_client *sender = NULL;
1981 struct snd_seq_client_port *sport = NULL;
1982 struct snd_seq_port_subscribe subs;
1983 struct snd_seq_subscribers *p;
1985 if (copy_from_user(&subs, arg, sizeof(subs)))
1989 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1991 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1993 p = snd_seq_port_get_subscription(&sport->c_src, &subs.dest);
2002 snd_seq_port_unlock(sport);
2004 snd_seq_client_unlock(sender);
2006 if (copy_to_user(arg, &subs, sizeof(subs)))
2014 * get subscription info - check only its presence
2016 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client,
2019 int result = -ENXIO;
2020 struct snd_seq_client *cptr = NULL;
2021 struct snd_seq_client_port *port = NULL;
2022 struct snd_seq_query_subs subs;
2023 struct snd_seq_port_subs_info *group;
2024 struct list_head *p;
2027 if (copy_from_user(&subs, arg, sizeof(subs)))
2030 if ((cptr = snd_seq_client_use_ptr(subs.root.client)) == NULL)
2032 if ((port = snd_seq_port_use_ptr(cptr, subs.root.port)) == NULL)
2035 switch (subs.type) {
2036 case SNDRV_SEQ_QUERY_SUBS_READ:
2037 group = &port->c_src;
2039 case SNDRV_SEQ_QUERY_SUBS_WRITE:
2040 group = &port->c_dest;
2046 down_read(&group->list_mutex);
2047 /* search for the subscriber */
2048 subs.num_subs = group->count;
2051 list_for_each(p, &group->list_head) {
2052 if (i++ == subs.index) {
2054 struct snd_seq_subscribers *s;
2055 if (subs.type == SNDRV_SEQ_QUERY_SUBS_READ) {
2056 s = list_entry(p, struct snd_seq_subscribers, src_list);
2057 subs.addr = s->info.dest;
2059 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2060 subs.addr = s->info.sender;
2062 subs.flags = s->info.flags;
2063 subs.queue = s->info.queue;
2068 up_read(&group->list_mutex);
2072 snd_seq_port_unlock(port);
2074 snd_seq_client_unlock(cptr);
2076 if (copy_to_user(arg, &subs, sizeof(subs)))
2086 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
2089 struct snd_seq_client *cptr = NULL;
2090 struct snd_seq_client_info info;
2092 if (copy_from_user(&info, arg, sizeof(info)))
2095 /* search for next client */
2097 if (info.client < 0)
2099 for (; info.client < SNDRV_SEQ_MAX_CLIENTS; info.client++) {
2100 cptr = snd_seq_client_use_ptr(info.client);
2107 get_client_info(cptr, &info);
2108 snd_seq_client_unlock(cptr);
2110 if (copy_to_user(arg, &info, sizeof(info)))
2118 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
2121 struct snd_seq_client *cptr;
2122 struct snd_seq_client_port *port = NULL;
2123 struct snd_seq_port_info info;
2125 if (copy_from_user(&info, arg, sizeof(info)))
2127 cptr = snd_seq_client_use_ptr(info.addr.client);
2131 /* search for next port */
2133 port = snd_seq_port_query_nearest(cptr, &info);
2135 snd_seq_client_unlock(cptr);
2140 info.addr = port->addr;
2141 snd_seq_get_port_info(port, &info);
2142 snd_seq_port_unlock(port);
2143 snd_seq_client_unlock(cptr);
2145 if (copy_to_user(arg, &info, sizeof(info)))
2150 /* -------------------------------------------------------- */
2152 static struct seq_ioctl_table {
2154 int (*func)(struct snd_seq_client *client, void __user * arg);
2155 } ioctl_tables[] = {
2156 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2157 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2158 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2159 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2160 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2161 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2162 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2163 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2164 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2165 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2166 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2167 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2168 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2169 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2170 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2171 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2172 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2173 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2174 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2175 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2176 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2177 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2178 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2179 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2180 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2181 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2182 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2183 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2184 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2188 static int snd_seq_do_ioctl(struct snd_seq_client *client, unsigned int cmd,
2191 struct seq_ioctl_table *p;
2194 case SNDRV_SEQ_IOCTL_PVERSION:
2195 /* return sequencer version number */
2196 return put_user(SNDRV_SEQ_VERSION, (int __user *)arg) ? -EFAULT : 0;
2197 case SNDRV_SEQ_IOCTL_CLIENT_ID:
2198 /* return the id of this client */
2199 return put_user(client->number, (int __user *)arg) ? -EFAULT : 0;
2204 for (p = ioctl_tables; p->cmd; p++) {
2206 return p->func(client, arg);
2208 snd_printd("seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n",
2209 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2214 static long snd_seq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2216 struct snd_seq_client *client = file->private_data;
2219 if (snd_BUG_ON(!client))
2222 mutex_lock(&client->ioctl_mutex);
2223 ret = snd_seq_do_ioctl(client, cmd, (void __user *) arg);
2224 mutex_unlock(&client->ioctl_mutex);
2228 #ifdef CONFIG_COMPAT
2229 #include "seq_compat.c"
2231 #define snd_seq_ioctl_compat NULL
2234 /* -------------------------------------------------------- */
2237 /* exported to kernel modules */
2238 int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
2239 const char *name_fmt, ...)
2241 struct snd_seq_client *client;
2244 if (snd_BUG_ON(in_interrupt()))
2247 if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD)
2249 if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
2252 if (mutex_lock_interruptible(®ister_mutex))
2253 return -ERESTARTSYS;
2256 client_index += SNDRV_SEQ_GLOBAL_CLIENTS
2257 + card->number * SNDRV_SEQ_CLIENTS_PER_CARD;
2258 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN)
2262 /* empty write queue as default */
2263 client = seq_create_client1(client_index, 0);
2264 if (client == NULL) {
2265 mutex_unlock(®ister_mutex);
2266 return -EBUSY; /* failure code */
2268 usage_alloc(&client_usage, 1);
2270 client->accept_input = 1;
2271 client->accept_output = 1;
2273 va_start(args, name_fmt);
2274 vsnprintf(client->name, sizeof(client->name), name_fmt, args);
2277 client->type = KERNEL_CLIENT;
2278 mutex_unlock(®ister_mutex);
2280 /* make others aware this new client */
2281 snd_seq_system_client_ev_client_start(client->number);
2283 /* return client number to caller */
2284 return client->number;
2287 EXPORT_SYMBOL(snd_seq_create_kernel_client);
2289 /* exported to kernel modules */
2290 int snd_seq_delete_kernel_client(int client)
2292 struct snd_seq_client *ptr;
2294 if (snd_BUG_ON(in_interrupt()))
2297 ptr = clientptr(client);
2301 seq_free_client(ptr);
2306 EXPORT_SYMBOL(snd_seq_delete_kernel_client);
2308 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue
2309 * and snd_seq_kernel_client_enqueue_blocking
2311 static int kernel_client_enqueue(int client, struct snd_seq_event *ev,
2312 struct file *file, int blocking,
2313 int atomic, int hop)
2315 struct snd_seq_client *cptr;
2318 if (snd_BUG_ON(!ev))
2321 if (ev->type == SNDRV_SEQ_EVENT_NONE)
2322 return 0; /* ignore this */
2323 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2324 return -EINVAL; /* quoted events can't be enqueued */
2326 /* fill in client number */
2327 ev->source.client = client;
2329 if (check_event_type_and_length(ev))
2332 cptr = snd_seq_client_use_ptr(client);
2336 if (! cptr->accept_output)
2339 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, atomic, hop);
2341 snd_seq_client_unlock(cptr);
2346 * exported, called by kernel clients to enqueue events (w/o blocking)
2348 * RETURN VALUE: zero if succeed, negative if error
2350 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev,
2351 int atomic, int hop)
2353 return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop);
2356 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
2359 * exported, called by kernel clients to enqueue events (with blocking)
2361 * RETURN VALUE: zero if succeed, negative if error
2363 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev,
2365 int atomic, int hop)
2367 return kernel_client_enqueue(client, ev, file, 1, atomic, hop);
2370 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking);
2373 * exported, called by kernel clients to dispatch events directly to other
2374 * clients, bypassing the queues. Event time-stamp will be updated.
2376 * RETURN VALUE: negative = delivery failed,
2377 * zero, or positive: the number of delivered events
2379 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev,
2380 int atomic, int hop)
2382 struct snd_seq_client *cptr;
2385 if (snd_BUG_ON(!ev))
2388 /* fill in client number */
2389 ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2390 ev->source.client = client;
2392 if (check_event_type_and_length(ev))
2395 cptr = snd_seq_client_use_ptr(client);
2399 if (!cptr->accept_output)
2402 result = snd_seq_deliver_event(cptr, ev, atomic, hop);
2404 snd_seq_client_unlock(cptr);
2408 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch);
2411 * exported, called by kernel clients to perform same functions as with
2414 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2416 struct snd_seq_client *client;
2420 client = clientptr(clientid);
2423 fs = snd_enter_user();
2424 result = snd_seq_do_ioctl(client, cmd, (void __force __user *)arg);
2429 EXPORT_SYMBOL(snd_seq_kernel_client_ctl);
2431 /* exported (for OSS emulator) */
2432 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2434 struct snd_seq_client *client;
2436 client = clientptr(clientid);
2440 if (! snd_seq_write_pool_allocated(client))
2442 if (snd_seq_pool_poll_wait(client->pool, file, wait))
2447 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll);
2449 /*---------------------------------------------------------------------------*/
2451 #ifdef CONFIG_PROC_FS
2455 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer,
2456 struct snd_seq_port_subs_info *group,
2457 int is_src, char *msg)
2459 struct list_head *p;
2460 struct snd_seq_subscribers *s;
2463 down_read(&group->list_mutex);
2464 if (list_empty(&group->list_head)) {
2465 up_read(&group->list_mutex);
2468 snd_iprintf(buffer, msg);
2469 list_for_each(p, &group->list_head) {
2471 s = list_entry(p, struct snd_seq_subscribers, src_list);
2473 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2475 snd_iprintf(buffer, ", ");
2476 snd_iprintf(buffer, "%d:%d",
2477 is_src ? s->info.dest.client : s->info.sender.client,
2478 is_src ? s->info.dest.port : s->info.sender.port);
2479 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
2480 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
2481 if (group->exclusive)
2482 snd_iprintf(buffer, "[ex]");
2484 up_read(&group->list_mutex);
2485 snd_iprintf(buffer, "\n");
2488 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
2489 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
2490 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
2492 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2494 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
2495 struct snd_seq_client *client)
2497 struct snd_seq_client_port *p;
2499 mutex_lock(&client->ports_mutex);
2500 list_for_each_entry(p, &client->ports_list_head, list) {
2501 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c)\n",
2502 p->addr.port, p->name,
2503 FLAG_PERM_RD(p->capability),
2504 FLAG_PERM_WR(p->capability),
2505 FLAG_PERM_EX(p->capability),
2506 FLAG_PERM_DUPLEX(p->capability));
2507 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: ");
2508 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: ");
2510 mutex_unlock(&client->ports_mutex);
2514 /* exported to seq_info.c */
2515 void snd_seq_info_clients_read(struct snd_info_entry *entry,
2516 struct snd_info_buffer *buffer)
2519 struct snd_seq_client *client;
2521 snd_iprintf(buffer, "Client info\n");
2522 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur);
2523 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak);
2524 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
2525 snd_iprintf(buffer, "\n");
2527 /* list the client table */
2528 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2529 client = snd_seq_client_use_ptr(c);
2532 if (client->type == NO_CLIENT) {
2533 snd_seq_client_unlock(client);
2537 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n",
2539 client->type == USER_CLIENT ? "User" : "Kernel");
2540 snd_seq_info_dump_ports(buffer, client);
2541 if (snd_seq_write_pool_allocated(client)) {
2542 snd_iprintf(buffer, " Output pool :\n");
2543 snd_seq_info_pool(buffer, client->pool, " ");
2545 if (client->type == USER_CLIENT && client->data.user.fifo &&
2546 client->data.user.fifo->pool) {
2547 snd_iprintf(buffer, " Input pool :\n");
2548 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " ");
2550 snd_seq_client_unlock(client);
2553 #endif /* CONFIG_PROC_FS */
2555 /*---------------------------------------------------------------------------*/
2562 static const struct file_operations snd_seq_f_ops =
2564 .owner = THIS_MODULE,
2565 .read = snd_seq_read,
2566 .write = snd_seq_write,
2567 .open = snd_seq_open,
2568 .release = snd_seq_release,
2569 .llseek = no_llseek,
2570 .poll = snd_seq_poll,
2571 .unlocked_ioctl = snd_seq_ioctl,
2572 .compat_ioctl = snd_seq_ioctl_compat,
2576 * register sequencer device
2578 int __init snd_sequencer_device_init(void)
2582 if (mutex_lock_interruptible(®ister_mutex))
2583 return -ERESTARTSYS;
2585 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
2586 &snd_seq_f_ops, NULL, "seq")) < 0) {
2587 mutex_unlock(®ister_mutex);
2591 mutex_unlock(®ister_mutex);
2599 * unregister sequencer device
2601 void __exit snd_sequencer_device_done(void)
2603 snd_unregister_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0);