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 spin_lock_irqsave(&clients_lock, flags);
274 clienttablock[client->number] = 1;
275 clienttab[client->number] = NULL;
276 spin_unlock_irqrestore(&clients_lock, flags);
277 snd_seq_delete_all_ports(client);
278 snd_seq_queue_client_leave(client->number);
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,
911 struct mutex *mutexp)
913 struct snd_seq_event_cell *cell;
916 /* special queue values - force direct passing */
917 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
918 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
919 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
921 #ifdef SUPPORT_BROADCAST
922 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) {
923 event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST;
924 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
927 if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
928 /* check presence of source port */
929 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port);
930 if (src_port == NULL)
932 snd_seq_port_unlock(src_port);
935 /* direct event processing without enqueued */
936 if (snd_seq_ev_is_direct(event)) {
937 if (event->type == SNDRV_SEQ_EVENT_NOTE)
938 return -EINVAL; /* this event must be enqueued! */
939 return snd_seq_deliver_event(client, event, atomic, hop);
942 /* Not direct, normal queuing */
943 if (snd_seq_queue_is_used(event->queue, client->number) <= 0)
944 return -EINVAL; /* invalid queue */
945 if (! snd_seq_write_pool_allocated(client))
946 return -ENXIO; /* queue is not allocated */
948 /* allocate an event cell */
949 err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic,
954 /* we got a cell. enqueue it. */
955 if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
956 snd_seq_cell_free(cell);
965 * check validity of event type and data length.
966 * return non-zero if invalid.
968 static int check_event_type_and_length(struct snd_seq_event *ev)
970 switch (snd_seq_ev_length_type(ev)) {
971 case SNDRV_SEQ_EVENT_LENGTH_FIXED:
972 if (snd_seq_ev_is_variable_type(ev))
975 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
976 if (! snd_seq_ev_is_variable_type(ev) ||
977 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
980 case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
981 if (! snd_seq_ev_is_direct(ev))
990 /* possible error values:
991 * -ENXIO invalid client or file open mode
992 * -ENOMEM malloc failed
993 * -EFAULT seg. fault during copy from user space
994 * -EINVAL invalid event
995 * -EAGAIN no space in output pool
996 * -EINTR interrupts while sleep
997 * -EMLINK too many hops
998 * others depends on return value from driver callback
1000 static ssize_t snd_seq_write(struct file *file, const char __user *buf,
1001 size_t count, loff_t *offset)
1003 struct snd_seq_client *client = file->private_data;
1004 int written = 0, len;
1006 struct snd_seq_event event;
1008 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
1011 /* check client structures are in place */
1012 if (snd_BUG_ON(!client))
1015 if (!client->accept_output || client->pool == NULL)
1018 /* allocate the pool now if the pool is not allocated yet */
1019 mutex_lock(&client->ioctl_mutex);
1020 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
1021 err = snd_seq_pool_init(client->pool);
1026 /* only process whole events */
1028 while (count >= sizeof(struct snd_seq_event)) {
1029 /* Read in the event header from the user */
1030 len = sizeof(event);
1031 if (copy_from_user(&event, buf, len)) {
1035 event.source.client = client->number; /* fill in client number */
1036 /* Check for extension data length */
1037 if (check_event_type_and_length(&event)) {
1042 /* check for special events */
1043 if (event.type == SNDRV_SEQ_EVENT_NONE)
1045 else if (snd_seq_ev_is_reserved(&event)) {
1050 if (snd_seq_ev_is_variable(&event)) {
1051 int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK;
1052 if ((size_t)(extlen + len) > count) {
1053 /* back out, will get an error this time or next */
1057 /* set user space pointer */
1058 event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
1059 event.data.ext.ptr = (char __force *)buf
1060 + sizeof(struct snd_seq_event);
1061 len += extlen; /* increment data length */
1063 #ifdef CONFIG_COMPAT
1064 if (client->convert32 && snd_seq_ev_is_varusr(&event)) {
1065 void *ptr = (void __force *)compat_ptr(event.data.raw32.d[1]);
1066 event.data.ext.ptr = ptr;
1071 /* ok, enqueue it */
1072 err = snd_seq_client_enqueue_event(client, &event, file,
1073 !(file->f_flags & O_NONBLOCK),
1074 0, 0, &client->ioctl_mutex);
1079 /* Update pointers and counts */
1086 mutex_unlock(&client->ioctl_mutex);
1087 return written ? written : err;
1094 static unsigned int snd_seq_poll(struct file *file, poll_table * wait)
1096 struct snd_seq_client *client = file->private_data;
1097 unsigned int mask = 0;
1099 /* check client structures are in place */
1100 if (snd_BUG_ON(!client))
1103 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1104 client->data.user.fifo) {
1106 /* check if data is available in the outqueue */
1107 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
1108 mask |= POLLIN | POLLRDNORM;
1111 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1113 /* check if data is available in the pool */
1114 if (!snd_seq_write_pool_allocated(client) ||
1115 snd_seq_pool_poll_wait(client->pool, file, wait))
1116 mask |= POLLOUT | POLLWRNORM;
1123 /*-----------------------------------------------------*/
1126 /* SYSTEM_INFO ioctl() */
1127 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void __user *arg)
1129 struct snd_seq_system_info info;
1131 memset(&info, 0, sizeof(info));
1132 /* fill the info fields */
1133 info.queues = SNDRV_SEQ_MAX_QUEUES;
1134 info.clients = SNDRV_SEQ_MAX_CLIENTS;
1135 info.ports = 256; /* fixed limit */
1136 info.channels = 256; /* fixed limit */
1137 info.cur_clients = client_usage.cur;
1138 info.cur_queues = snd_seq_queue_get_cur_queues();
1140 if (copy_to_user(arg, &info, sizeof(info)))
1146 /* RUNNING_MODE ioctl() */
1147 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void __user *arg)
1149 struct snd_seq_running_info info;
1150 struct snd_seq_client *cptr;
1153 if (copy_from_user(&info, arg, sizeof(info)))
1156 /* requested client number */
1157 cptr = snd_seq_client_use_ptr(info.client);
1159 return -ENOENT; /* don't change !!! */
1161 #ifdef SNDRV_BIG_ENDIAN
1162 if (! info.big_endian) {
1167 if (info.big_endian) {
1173 if (info.cpu_mode > sizeof(long)) {
1177 cptr->convert32 = (info.cpu_mode < sizeof(long));
1179 snd_seq_client_unlock(cptr);
1183 /* CLIENT_INFO ioctl() */
1184 static void get_client_info(struct snd_seq_client *cptr,
1185 struct snd_seq_client_info *info)
1187 info->client = cptr->number;
1189 /* fill the info fields */
1190 info->type = cptr->type;
1191 strcpy(info->name, cptr->name);
1192 info->filter = cptr->filter;
1193 info->event_lost = cptr->event_lost;
1194 memcpy(info->event_filter, cptr->event_filter, 32);
1195 info->num_ports = cptr->num_ports;
1196 memset(info->reserved, 0, sizeof(info->reserved));
1199 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
1202 struct snd_seq_client *cptr;
1203 struct snd_seq_client_info client_info;
1205 if (copy_from_user(&client_info, arg, sizeof(client_info)))
1208 /* requested client number */
1209 cptr = snd_seq_client_use_ptr(client_info.client);
1211 return -ENOENT; /* don't change !!! */
1213 get_client_info(cptr, &client_info);
1214 snd_seq_client_unlock(cptr);
1216 if (copy_to_user(arg, &client_info, sizeof(client_info)))
1222 /* CLIENT_INFO ioctl() */
1223 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
1226 struct snd_seq_client_info client_info;
1228 if (copy_from_user(&client_info, arg, sizeof(client_info)))
1231 /* it is not allowed to set the info fields for an another client */
1232 if (client->number != client_info.client)
1234 /* also client type must be set now */
1235 if (client->type != client_info.type)
1238 /* fill the info fields */
1239 if (client_info.name[0])
1240 strlcpy(client->name, client_info.name, sizeof(client->name));
1242 client->filter = client_info.filter;
1243 client->event_lost = client_info.event_lost;
1244 memcpy(client->event_filter, client_info.event_filter, 32);
1251 * CREATE PORT ioctl()
1253 static int snd_seq_ioctl_create_port(struct snd_seq_client *client,
1256 struct snd_seq_client_port *port;
1257 struct snd_seq_port_info info;
1258 struct snd_seq_port_callback *callback;
1261 if (copy_from_user(&info, arg, sizeof(info)))
1264 /* it is not allowed to create the port for an another client */
1265 if (info.addr.client != client->number)
1268 port = snd_seq_create_port(client, (info.flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info.addr.port : -1);
1272 if (client->type == USER_CLIENT && info.kernel) {
1273 port_idx = port->addr.port;
1274 snd_seq_port_unlock(port);
1275 snd_seq_delete_port(client, port_idx);
1278 if (client->type == KERNEL_CLIENT) {
1279 if ((callback = info.kernel) != NULL) {
1280 if (callback->owner)
1281 port->owner = callback->owner;
1282 port->private_data = callback->private_data;
1283 port->private_free = callback->private_free;
1284 port->callback_all = callback->callback_all;
1285 port->event_input = callback->event_input;
1286 port->c_src.open = callback->subscribe;
1287 port->c_src.close = callback->unsubscribe;
1288 port->c_dest.open = callback->use;
1289 port->c_dest.close = callback->unuse;
1293 info.addr = port->addr;
1295 snd_seq_set_port_info(port, &info);
1296 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1297 snd_seq_port_unlock(port);
1299 if (copy_to_user(arg, &info, sizeof(info)))
1306 * DELETE PORT ioctl()
1308 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client,
1311 struct snd_seq_port_info info;
1314 /* set passed parameters */
1315 if (copy_from_user(&info, arg, sizeof(info)))
1318 /* it is not allowed to remove the port for an another client */
1319 if (info.addr.client != client->number)
1322 err = snd_seq_delete_port(client, info.addr.port);
1324 snd_seq_system_client_ev_port_exit(client->number, info.addr.port);
1330 * GET_PORT_INFO ioctl() (on any client)
1332 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client,
1335 struct snd_seq_client *cptr;
1336 struct snd_seq_client_port *port;
1337 struct snd_seq_port_info info;
1339 if (copy_from_user(&info, arg, sizeof(info)))
1341 cptr = snd_seq_client_use_ptr(info.addr.client);
1345 port = snd_seq_port_use_ptr(cptr, info.addr.port);
1347 snd_seq_client_unlock(cptr);
1348 return -ENOENT; /* don't change */
1352 snd_seq_get_port_info(port, &info);
1353 snd_seq_port_unlock(port);
1354 snd_seq_client_unlock(cptr);
1356 if (copy_to_user(arg, &info, sizeof(info)))
1363 * SET_PORT_INFO ioctl() (only ports on this/own client)
1365 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client,
1368 struct snd_seq_client_port *port;
1369 struct snd_seq_port_info info;
1371 if (copy_from_user(&info, arg, sizeof(info)))
1374 if (info.addr.client != client->number) /* only set our own ports ! */
1376 port = snd_seq_port_use_ptr(client, info.addr.port);
1378 snd_seq_set_port_info(port, &info);
1379 snd_seq_port_unlock(port);
1386 * port subscription (connection)
1388 #define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1389 #define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1391 static int check_subscription_permission(struct snd_seq_client *client,
1392 struct snd_seq_client_port *sport,
1393 struct snd_seq_client_port *dport,
1394 struct snd_seq_port_subscribe *subs)
1396 if (client->number != subs->sender.client &&
1397 client->number != subs->dest.client) {
1398 /* connection by third client - check export permission */
1399 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1401 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1405 /* check read permission */
1406 /* if sender or receiver is the subscribing client itself,
1407 * no permission check is necessary
1409 if (client->number != subs->sender.client) {
1410 if (! check_port_perm(sport, PERM_RD))
1413 /* check write permission */
1414 if (client->number != subs->dest.client) {
1415 if (! check_port_perm(dport, PERM_WR))
1422 * send an subscription notify event to user client:
1423 * client must be user client.
1425 int snd_seq_client_notify_subscription(int client, int port,
1426 struct snd_seq_port_subscribe *info,
1429 struct snd_seq_event event;
1431 memset(&event, 0, sizeof(event));
1432 event.type = evtype;
1433 event.data.connect.dest = info->dest;
1434 event.data.connect.sender = info->sender;
1436 return snd_seq_system_notify(client, port, &event); /* non-atomic */
1441 * add to port's subscription list IOCTL interface
1443 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
1446 int result = -EINVAL;
1447 struct snd_seq_client *receiver = NULL, *sender = NULL;
1448 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1449 struct snd_seq_port_subscribe subs;
1451 if (copy_from_user(&subs, arg, sizeof(subs)))
1454 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1456 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1458 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1460 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1463 result = check_subscription_permission(client, sport, dport, &subs);
1468 result = snd_seq_port_connect(client, sender, sport, receiver, dport, &subs);
1469 if (! result) /* broadcast announce */
1470 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1471 &subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1474 snd_seq_port_unlock(sport);
1476 snd_seq_port_unlock(dport);
1478 snd_seq_client_unlock(sender);
1480 snd_seq_client_unlock(receiver);
1486 * remove from port's subscription list
1488 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
1491 int result = -ENXIO;
1492 struct snd_seq_client *receiver = NULL, *sender = NULL;
1493 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1494 struct snd_seq_port_subscribe subs;
1496 if (copy_from_user(&subs, arg, sizeof(subs)))
1499 if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1501 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1503 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1505 if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1508 result = check_subscription_permission(client, sport, dport, &subs);
1512 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, &subs);
1513 if (! result) /* broadcast announce */
1514 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1515 &subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1518 snd_seq_port_unlock(sport);
1520 snd_seq_port_unlock(dport);
1522 snd_seq_client_unlock(sender);
1524 snd_seq_client_unlock(receiver);
1529 /* CREATE_QUEUE ioctl() */
1530 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client,
1533 struct snd_seq_queue_info info;
1535 struct snd_seq_queue *q;
1537 if (copy_from_user(&info, arg, sizeof(info)))
1540 result = snd_seq_queue_alloc(client->number, info.locked, info.flags);
1544 q = queueptr(result);
1548 info.queue = q->queue;
1549 info.locked = q->locked;
1550 info.owner = q->owner;
1552 /* set queue name */
1554 snprintf(info.name, sizeof(info.name), "Queue-%d", q->queue);
1555 strlcpy(q->name, info.name, sizeof(q->name));
1558 if (copy_to_user(arg, &info, sizeof(info)))
1564 /* DELETE_QUEUE ioctl() */
1565 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client,
1568 struct snd_seq_queue_info info;
1570 if (copy_from_user(&info, arg, sizeof(info)))
1573 return snd_seq_queue_delete(client->number, info.queue);
1576 /* GET_QUEUE_INFO ioctl() */
1577 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client,
1580 struct snd_seq_queue_info info;
1581 struct snd_seq_queue *q;
1583 if (copy_from_user(&info, arg, sizeof(info)))
1586 q = queueptr(info.queue);
1590 memset(&info, 0, sizeof(info));
1591 info.queue = q->queue;
1592 info.owner = q->owner;
1593 info.locked = q->locked;
1594 strlcpy(info.name, q->name, sizeof(info.name));
1597 if (copy_to_user(arg, &info, sizeof(info)))
1603 /* SET_QUEUE_INFO ioctl() */
1604 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
1607 struct snd_seq_queue_info info;
1608 struct snd_seq_queue *q;
1610 if (copy_from_user(&info, arg, sizeof(info)))
1613 if (info.owner != client->number)
1616 /* change owner/locked permission */
1617 if (snd_seq_queue_check_access(info.queue, client->number)) {
1618 if (snd_seq_queue_set_owner(info.queue, client->number, info.locked) < 0)
1621 snd_seq_queue_use(info.queue, client->number, 1);
1626 q = queueptr(info.queue);
1629 if (q->owner != client->number) {
1633 strlcpy(q->name, info.name, sizeof(q->name));
1639 /* GET_NAMED_QUEUE ioctl() */
1640 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client, void __user *arg)
1642 struct snd_seq_queue_info info;
1643 struct snd_seq_queue *q;
1645 if (copy_from_user(&info, arg, sizeof(info)))
1648 q = snd_seq_queue_find_name(info.name);
1651 info.queue = q->queue;
1652 info.owner = q->owner;
1653 info.locked = q->locked;
1656 if (copy_to_user(arg, &info, sizeof(info)))
1662 /* GET_QUEUE_STATUS ioctl() */
1663 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
1666 struct snd_seq_queue_status status;
1667 struct snd_seq_queue *queue;
1668 struct snd_seq_timer *tmr;
1670 if (copy_from_user(&status, arg, sizeof(status)))
1673 queue = queueptr(status.queue);
1676 memset(&status, 0, sizeof(status));
1677 status.queue = queue->queue;
1680 status.events = queue->tickq->cells + queue->timeq->cells;
1682 status.time = snd_seq_timer_get_cur_time(tmr);
1683 status.tick = snd_seq_timer_get_cur_tick(tmr);
1685 status.running = tmr->running;
1687 status.flags = queue->flags;
1690 if (copy_to_user(arg, &status, sizeof(status)))
1696 /* GET_QUEUE_TEMPO ioctl() */
1697 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
1700 struct snd_seq_queue_tempo tempo;
1701 struct snd_seq_queue *queue;
1702 struct snd_seq_timer *tmr;
1704 if (copy_from_user(&tempo, arg, sizeof(tempo)))
1707 queue = queueptr(tempo.queue);
1710 memset(&tempo, 0, sizeof(tempo));
1711 tempo.queue = queue->queue;
1715 tempo.tempo = tmr->tempo;
1716 tempo.ppq = tmr->ppq;
1717 tempo.skew_value = tmr->skew;
1718 tempo.skew_base = tmr->skew_base;
1721 if (copy_to_user(arg, &tempo, sizeof(tempo)))
1727 /* SET_QUEUE_TEMPO ioctl() */
1728 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1730 if (!snd_seq_queue_check_access(tempo->queue, client))
1732 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1735 EXPORT_SYMBOL(snd_seq_set_queue_tempo);
1737 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
1741 struct snd_seq_queue_tempo tempo;
1743 if (copy_from_user(&tempo, arg, sizeof(tempo)))
1746 result = snd_seq_set_queue_tempo(client->number, &tempo);
1747 return result < 0 ? result : 0;
1751 /* GET_QUEUE_TIMER ioctl() */
1752 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
1755 struct snd_seq_queue_timer timer;
1756 struct snd_seq_queue *queue;
1757 struct snd_seq_timer *tmr;
1759 if (copy_from_user(&timer, arg, sizeof(timer)))
1762 queue = queueptr(timer.queue);
1766 if (mutex_lock_interruptible(&queue->timer_mutex)) {
1768 return -ERESTARTSYS;
1771 memset(&timer, 0, sizeof(timer));
1772 timer.queue = queue->queue;
1774 timer.type = tmr->type;
1775 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1776 timer.u.alsa.id = tmr->alsa_id;
1777 timer.u.alsa.resolution = tmr->preferred_resolution;
1779 mutex_unlock(&queue->timer_mutex);
1782 if (copy_to_user(arg, &timer, sizeof(timer)))
1788 /* SET_QUEUE_TIMER ioctl() */
1789 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
1793 struct snd_seq_queue_timer timer;
1795 if (copy_from_user(&timer, arg, sizeof(timer)))
1798 if (timer.type != SNDRV_SEQ_TIMER_ALSA)
1801 if (snd_seq_queue_check_access(timer.queue, client->number)) {
1802 struct snd_seq_queue *q;
1803 struct snd_seq_timer *tmr;
1805 q = queueptr(timer.queue);
1808 if (mutex_lock_interruptible(&q->timer_mutex)) {
1810 return -ERESTARTSYS;
1813 snd_seq_queue_timer_close(timer.queue);
1814 tmr->type = timer.type;
1815 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1816 tmr->alsa_id = timer.u.alsa.id;
1817 tmr->preferred_resolution = timer.u.alsa.resolution;
1819 result = snd_seq_queue_timer_open(timer.queue);
1820 mutex_unlock(&q->timer_mutex);
1830 /* GET_QUEUE_CLIENT ioctl() */
1831 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
1834 struct snd_seq_queue_client info;
1837 if (copy_from_user(&info, arg, sizeof(info)))
1840 used = snd_seq_queue_is_used(info.queue, client->number);
1844 info.client = client->number;
1846 if (copy_to_user(arg, &info, sizeof(info)))
1852 /* SET_QUEUE_CLIENT ioctl() */
1853 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
1857 struct snd_seq_queue_client info;
1859 if (copy_from_user(&info, arg, sizeof(info)))
1862 if (info.used >= 0) {
1863 err = snd_seq_queue_use(info.queue, client->number, info.used);
1868 return snd_seq_ioctl_get_queue_client(client, arg);
1872 /* GET_CLIENT_POOL ioctl() */
1873 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
1876 struct snd_seq_client_pool info;
1877 struct snd_seq_client *cptr;
1879 if (copy_from_user(&info, arg, sizeof(info)))
1882 cptr = snd_seq_client_use_ptr(info.client);
1885 memset(&info, 0, sizeof(info));
1886 info.output_pool = cptr->pool->size;
1887 info.output_room = cptr->pool->room;
1888 info.output_free = info.output_pool;
1889 info.output_free = snd_seq_unused_cells(cptr->pool);
1890 if (cptr->type == USER_CLIENT) {
1891 info.input_pool = cptr->data.user.fifo_pool_size;
1892 info.input_free = info.input_pool;
1893 if (cptr->data.user.fifo)
1894 info.input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool);
1896 info.input_pool = 0;
1897 info.input_free = 0;
1899 snd_seq_client_unlock(cptr);
1901 if (copy_to_user(arg, &info, sizeof(info)))
1906 /* SET_CLIENT_POOL ioctl() */
1907 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
1910 struct snd_seq_client_pool info;
1913 if (copy_from_user(&info, arg, sizeof(info)))
1916 if (client->number != info.client)
1917 return -EINVAL; /* can't change other clients */
1919 if (info.output_pool >= 1 && info.output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1920 (! snd_seq_write_pool_allocated(client) ||
1921 info.output_pool != client->pool->size)) {
1922 if (snd_seq_write_pool_allocated(client)) {
1923 /* is the pool in use? */
1924 if (atomic_read(&client->pool->counter))
1926 /* remove all existing cells */
1927 snd_seq_pool_mark_closing(client->pool);
1928 snd_seq_queue_client_leave_cells(client->number);
1929 snd_seq_pool_done(client->pool);
1931 client->pool->size = info.output_pool;
1932 rc = snd_seq_pool_init(client->pool);
1936 if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
1937 info.input_pool >= 1 &&
1938 info.input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1939 info.input_pool != client->data.user.fifo_pool_size) {
1940 /* change pool size */
1941 rc = snd_seq_fifo_resize(client->data.user.fifo, info.input_pool);
1944 client->data.user.fifo_pool_size = info.input_pool;
1946 if (info.output_room >= 1 &&
1947 info.output_room <= client->pool->size) {
1948 client->pool->room = info.output_room;
1951 return snd_seq_ioctl_get_client_pool(client, arg);
1955 /* REMOVE_EVENTS ioctl() */
1956 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
1959 struct snd_seq_remove_events info;
1961 if (copy_from_user(&info, arg, sizeof(info)))
1965 * Input mostly not implemented XXX.
1967 if (info.remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1969 * No restrictions so for a user client we can clear
1972 if (client->type == USER_CLIENT && client->data.user.fifo)
1973 snd_seq_fifo_clear(client->data.user.fifo);
1976 if (info.remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1977 snd_seq_queue_remove_cells(client->number, &info);
1984 * get subscription info
1986 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
1990 struct snd_seq_client *sender = NULL;
1991 struct snd_seq_client_port *sport = NULL;
1992 struct snd_seq_port_subscribe subs;
1993 struct snd_seq_subscribers *p;
1995 if (copy_from_user(&subs, arg, sizeof(subs)))
1999 if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
2001 if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
2003 p = snd_seq_port_get_subscription(&sport->c_src, &subs.dest);
2012 snd_seq_port_unlock(sport);
2014 snd_seq_client_unlock(sender);
2016 if (copy_to_user(arg, &subs, sizeof(subs)))
2024 * get subscription info - check only its presence
2026 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client,
2029 int result = -ENXIO;
2030 struct snd_seq_client *cptr = NULL;
2031 struct snd_seq_client_port *port = NULL;
2032 struct snd_seq_query_subs subs;
2033 struct snd_seq_port_subs_info *group;
2034 struct list_head *p;
2037 if (copy_from_user(&subs, arg, sizeof(subs)))
2040 if ((cptr = snd_seq_client_use_ptr(subs.root.client)) == NULL)
2042 if ((port = snd_seq_port_use_ptr(cptr, subs.root.port)) == NULL)
2045 switch (subs.type) {
2046 case SNDRV_SEQ_QUERY_SUBS_READ:
2047 group = &port->c_src;
2049 case SNDRV_SEQ_QUERY_SUBS_WRITE:
2050 group = &port->c_dest;
2056 down_read(&group->list_mutex);
2057 /* search for the subscriber */
2058 subs.num_subs = group->count;
2061 list_for_each(p, &group->list_head) {
2062 if (i++ == subs.index) {
2064 struct snd_seq_subscribers *s;
2065 if (subs.type == SNDRV_SEQ_QUERY_SUBS_READ) {
2066 s = list_entry(p, struct snd_seq_subscribers, src_list);
2067 subs.addr = s->info.dest;
2069 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2070 subs.addr = s->info.sender;
2072 subs.flags = s->info.flags;
2073 subs.queue = s->info.queue;
2078 up_read(&group->list_mutex);
2082 snd_seq_port_unlock(port);
2084 snd_seq_client_unlock(cptr);
2086 if (copy_to_user(arg, &subs, sizeof(subs)))
2096 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
2099 struct snd_seq_client *cptr = NULL;
2100 struct snd_seq_client_info info;
2102 if (copy_from_user(&info, arg, sizeof(info)))
2105 /* search for next client */
2107 if (info.client < 0)
2109 for (; info.client < SNDRV_SEQ_MAX_CLIENTS; info.client++) {
2110 cptr = snd_seq_client_use_ptr(info.client);
2117 get_client_info(cptr, &info);
2118 snd_seq_client_unlock(cptr);
2120 if (copy_to_user(arg, &info, sizeof(info)))
2128 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
2131 struct snd_seq_client *cptr;
2132 struct snd_seq_client_port *port = NULL;
2133 struct snd_seq_port_info info;
2135 if (copy_from_user(&info, arg, sizeof(info)))
2137 cptr = snd_seq_client_use_ptr(info.addr.client);
2141 /* search for next port */
2143 port = snd_seq_port_query_nearest(cptr, &info);
2145 snd_seq_client_unlock(cptr);
2150 info.addr = port->addr;
2151 snd_seq_get_port_info(port, &info);
2152 snd_seq_port_unlock(port);
2153 snd_seq_client_unlock(cptr);
2155 if (copy_to_user(arg, &info, sizeof(info)))
2160 /* -------------------------------------------------------- */
2162 static struct seq_ioctl_table {
2164 int (*func)(struct snd_seq_client *client, void __user * arg);
2165 } ioctl_tables[] = {
2166 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2167 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2168 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2169 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2170 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2171 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2172 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2173 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2174 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2175 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2176 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2177 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2178 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2179 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2180 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2181 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2182 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2183 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2184 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2185 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2186 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2187 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2188 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2189 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2190 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2191 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2192 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2193 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2194 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2198 static int snd_seq_do_ioctl(struct snd_seq_client *client, unsigned int cmd,
2201 struct seq_ioctl_table *p;
2204 case SNDRV_SEQ_IOCTL_PVERSION:
2205 /* return sequencer version number */
2206 return put_user(SNDRV_SEQ_VERSION, (int __user *)arg) ? -EFAULT : 0;
2207 case SNDRV_SEQ_IOCTL_CLIENT_ID:
2208 /* return the id of this client */
2209 return put_user(client->number, (int __user *)arg) ? -EFAULT : 0;
2214 for (p = ioctl_tables; p->cmd; p++) {
2216 return p->func(client, arg);
2218 snd_printd("seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n",
2219 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2224 static long snd_seq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2226 struct snd_seq_client *client = file->private_data;
2229 if (snd_BUG_ON(!client))
2232 mutex_lock(&client->ioctl_mutex);
2233 ret = snd_seq_do_ioctl(client, cmd, (void __user *) arg);
2234 mutex_unlock(&client->ioctl_mutex);
2238 #ifdef CONFIG_COMPAT
2239 #include "seq_compat.c"
2241 #define snd_seq_ioctl_compat NULL
2244 /* -------------------------------------------------------- */
2247 /* exported to kernel modules */
2248 int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
2249 const char *name_fmt, ...)
2251 struct snd_seq_client *client;
2254 if (snd_BUG_ON(in_interrupt()))
2257 if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD)
2259 if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
2262 if (mutex_lock_interruptible(®ister_mutex))
2263 return -ERESTARTSYS;
2266 client_index += SNDRV_SEQ_GLOBAL_CLIENTS
2267 + card->number * SNDRV_SEQ_CLIENTS_PER_CARD;
2268 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN)
2272 /* empty write queue as default */
2273 client = seq_create_client1(client_index, 0);
2274 if (client == NULL) {
2275 mutex_unlock(®ister_mutex);
2276 return -EBUSY; /* failure code */
2278 usage_alloc(&client_usage, 1);
2280 client->accept_input = 1;
2281 client->accept_output = 1;
2283 va_start(args, name_fmt);
2284 vsnprintf(client->name, sizeof(client->name), name_fmt, args);
2287 client->type = KERNEL_CLIENT;
2288 mutex_unlock(®ister_mutex);
2290 /* make others aware this new client */
2291 snd_seq_system_client_ev_client_start(client->number);
2293 /* return client number to caller */
2294 return client->number;
2297 EXPORT_SYMBOL(snd_seq_create_kernel_client);
2299 /* exported to kernel modules */
2300 int snd_seq_delete_kernel_client(int client)
2302 struct snd_seq_client *ptr;
2304 if (snd_BUG_ON(in_interrupt()))
2307 ptr = clientptr(client);
2311 seq_free_client(ptr);
2316 EXPORT_SYMBOL(snd_seq_delete_kernel_client);
2318 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue
2319 * and snd_seq_kernel_client_enqueue_blocking
2321 static int kernel_client_enqueue(int client, struct snd_seq_event *ev,
2322 struct file *file, int blocking,
2323 int atomic, int hop)
2325 struct snd_seq_client *cptr;
2328 if (snd_BUG_ON(!ev))
2331 if (ev->type == SNDRV_SEQ_EVENT_NONE)
2332 return 0; /* ignore this */
2333 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2334 return -EINVAL; /* quoted events can't be enqueued */
2336 /* fill in client number */
2337 ev->source.client = client;
2339 if (check_event_type_and_length(ev))
2342 cptr = snd_seq_client_use_ptr(client);
2346 if (! cptr->accept_output)
2349 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking,
2352 snd_seq_client_unlock(cptr);
2357 * exported, called by kernel clients to enqueue events (w/o blocking)
2359 * RETURN VALUE: zero if succeed, negative if error
2361 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev,
2362 int atomic, int hop)
2364 return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop);
2367 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
2370 * exported, called by kernel clients to enqueue events (with blocking)
2372 * RETURN VALUE: zero if succeed, negative if error
2374 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev,
2376 int atomic, int hop)
2378 return kernel_client_enqueue(client, ev, file, 1, atomic, hop);
2381 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking);
2384 * exported, called by kernel clients to dispatch events directly to other
2385 * clients, bypassing the queues. Event time-stamp will be updated.
2387 * RETURN VALUE: negative = delivery failed,
2388 * zero, or positive: the number of delivered events
2390 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev,
2391 int atomic, int hop)
2393 struct snd_seq_client *cptr;
2396 if (snd_BUG_ON(!ev))
2399 /* fill in client number */
2400 ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2401 ev->source.client = client;
2403 if (check_event_type_and_length(ev))
2406 cptr = snd_seq_client_use_ptr(client);
2410 if (!cptr->accept_output)
2413 result = snd_seq_deliver_event(cptr, ev, atomic, hop);
2415 snd_seq_client_unlock(cptr);
2419 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch);
2422 * exported, called by kernel clients to perform same functions as with
2425 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2427 struct snd_seq_client *client;
2431 client = clientptr(clientid);
2434 fs = snd_enter_user();
2435 result = snd_seq_do_ioctl(client, cmd, (void __force __user *)arg);
2440 EXPORT_SYMBOL(snd_seq_kernel_client_ctl);
2442 /* exported (for OSS emulator) */
2443 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2445 struct snd_seq_client *client;
2447 client = clientptr(clientid);
2451 if (! snd_seq_write_pool_allocated(client))
2453 if (snd_seq_pool_poll_wait(client->pool, file, wait))
2458 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll);
2460 /*---------------------------------------------------------------------------*/
2462 #ifdef CONFIG_PROC_FS
2466 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer,
2467 struct snd_seq_port_subs_info *group,
2468 int is_src, char *msg)
2470 struct list_head *p;
2471 struct snd_seq_subscribers *s;
2474 down_read(&group->list_mutex);
2475 if (list_empty(&group->list_head)) {
2476 up_read(&group->list_mutex);
2479 snd_iprintf(buffer, msg);
2480 list_for_each(p, &group->list_head) {
2482 s = list_entry(p, struct snd_seq_subscribers, src_list);
2484 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2486 snd_iprintf(buffer, ", ");
2487 snd_iprintf(buffer, "%d:%d",
2488 is_src ? s->info.dest.client : s->info.sender.client,
2489 is_src ? s->info.dest.port : s->info.sender.port);
2490 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
2491 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
2492 if (group->exclusive)
2493 snd_iprintf(buffer, "[ex]");
2495 up_read(&group->list_mutex);
2496 snd_iprintf(buffer, "\n");
2499 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
2500 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
2501 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
2503 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2505 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
2506 struct snd_seq_client *client)
2508 struct snd_seq_client_port *p;
2510 mutex_lock(&client->ports_mutex);
2511 list_for_each_entry(p, &client->ports_list_head, list) {
2512 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c)\n",
2513 p->addr.port, p->name,
2514 FLAG_PERM_RD(p->capability),
2515 FLAG_PERM_WR(p->capability),
2516 FLAG_PERM_EX(p->capability),
2517 FLAG_PERM_DUPLEX(p->capability));
2518 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: ");
2519 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: ");
2521 mutex_unlock(&client->ports_mutex);
2525 /* exported to seq_info.c */
2526 void snd_seq_info_clients_read(struct snd_info_entry *entry,
2527 struct snd_info_buffer *buffer)
2530 struct snd_seq_client *client;
2532 snd_iprintf(buffer, "Client info\n");
2533 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur);
2534 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak);
2535 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
2536 snd_iprintf(buffer, "\n");
2538 /* list the client table */
2539 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2540 client = snd_seq_client_use_ptr(c);
2543 if (client->type == NO_CLIENT) {
2544 snd_seq_client_unlock(client);
2548 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n",
2550 client->type == USER_CLIENT ? "User" : "Kernel");
2551 snd_seq_info_dump_ports(buffer, client);
2552 if (snd_seq_write_pool_allocated(client)) {
2553 snd_iprintf(buffer, " Output pool :\n");
2554 snd_seq_info_pool(buffer, client->pool, " ");
2556 if (client->type == USER_CLIENT && client->data.user.fifo &&
2557 client->data.user.fifo->pool) {
2558 snd_iprintf(buffer, " Input pool :\n");
2559 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " ");
2561 snd_seq_client_unlock(client);
2564 #endif /* CONFIG_PROC_FS */
2566 /*---------------------------------------------------------------------------*/
2573 static const struct file_operations snd_seq_f_ops =
2575 .owner = THIS_MODULE,
2576 .read = snd_seq_read,
2577 .write = snd_seq_write,
2578 .open = snd_seq_open,
2579 .release = snd_seq_release,
2580 .llseek = no_llseek,
2581 .poll = snd_seq_poll,
2582 .unlocked_ioctl = snd_seq_ioctl,
2583 .compat_ioctl = snd_seq_ioctl_compat,
2587 * register sequencer device
2589 int __init snd_sequencer_device_init(void)
2593 if (mutex_lock_interruptible(®ister_mutex))
2594 return -ERESTARTSYS;
2596 if ((err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
2597 &snd_seq_f_ops, NULL, "seq")) < 0) {
2598 mutex_unlock(®ister_mutex);
2602 mutex_unlock(®ister_mutex);
2610 * unregister sequencer device
2612 void __exit snd_sequencer_device_done(void)
2614 snd_unregister_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0);