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);
90 static inline unsigned short snd_seq_file_flags(struct file *file)
92 switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
94 return SNDRV_SEQ_LFLG_OUTPUT;
96 return SNDRV_SEQ_LFLG_INPUT;
98 return SNDRV_SEQ_LFLG_OPEN;
102 static inline int snd_seq_write_pool_allocated(struct snd_seq_client *client)
104 return snd_seq_total_cells(client->pool) > 0;
107 /* return pointer to client structure for specified id */
108 static struct snd_seq_client *clientptr(int clientid)
110 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
111 pr_debug("ALSA: seq: oops. Trying to get pointer to client %d\n",
115 return clienttab[clientid];
118 struct snd_seq_client *snd_seq_client_use_ptr(int clientid)
121 struct snd_seq_client *client;
123 if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
124 pr_debug("ALSA: seq: oops. Trying to get pointer to client %d\n",
128 spin_lock_irqsave(&clients_lock, flags);
129 client = clientptr(clientid);
132 if (clienttablock[clientid]) {
133 spin_unlock_irqrestore(&clients_lock, flags);
136 spin_unlock_irqrestore(&clients_lock, flags);
137 #ifdef CONFIG_MODULES
138 if (!in_interrupt()) {
139 static char client_requested[SNDRV_SEQ_GLOBAL_CLIENTS];
140 static char card_requested[SNDRV_CARDS];
141 if (clientid < SNDRV_SEQ_GLOBAL_CLIENTS) {
144 if (!client_requested[clientid]) {
145 client_requested[clientid] = 1;
146 for (idx = 0; idx < 15; idx++) {
147 if (seq_client_load[idx] < 0)
149 if (seq_client_load[idx] == clientid) {
150 request_module("snd-seq-client-%i",
156 } else if (clientid < SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) {
157 int card = (clientid - SNDRV_SEQ_GLOBAL_CLIENTS) /
158 SNDRV_SEQ_CLIENTS_PER_CARD;
159 if (card < snd_ecards_limit) {
160 if (! card_requested[card]) {
161 card_requested[card] = 1;
162 snd_request_card(card);
164 snd_seq_device_load_drivers();
167 spin_lock_irqsave(&clients_lock, flags);
168 client = clientptr(clientid);
171 spin_unlock_irqrestore(&clients_lock, flags);
177 snd_use_lock_use(&client->use_lock);
178 spin_unlock_irqrestore(&clients_lock, flags);
182 static void usage_alloc(struct snd_seq_usage *res, int num)
185 if (res->cur > res->peak)
186 res->peak = res->cur;
189 static void usage_free(struct snd_seq_usage *res, int num)
194 /* initialise data structures */
195 int __init client_init_data(void)
197 /* zap out the client table */
198 memset(&clienttablock, 0, sizeof(clienttablock));
199 memset(&clienttab, 0, sizeof(clienttab));
204 static struct snd_seq_client *seq_create_client1(int client_index, int poolsize)
208 struct snd_seq_client *client;
210 /* init client data */
211 client = kzalloc(sizeof(*client), GFP_KERNEL);
214 client->pool = snd_seq_pool_new(poolsize);
215 if (client->pool == NULL) {
219 client->type = NO_CLIENT;
220 snd_use_lock_init(&client->use_lock);
221 rwlock_init(&client->ports_lock);
222 mutex_init(&client->ports_mutex);
223 INIT_LIST_HEAD(&client->ports_list_head);
224 mutex_init(&client->ioctl_mutex);
226 /* find free slot in the client table */
227 spin_lock_irqsave(&clients_lock, flags);
228 if (client_index < 0) {
229 for (c = SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN;
230 c < SNDRV_SEQ_MAX_CLIENTS;
232 if (clienttab[c] || clienttablock[c])
234 clienttab[client->number = c] = client;
235 spin_unlock_irqrestore(&clients_lock, flags);
239 if (clienttab[client_index] == NULL && !clienttablock[client_index]) {
240 clienttab[client->number = client_index] = client;
241 spin_unlock_irqrestore(&clients_lock, flags);
245 spin_unlock_irqrestore(&clients_lock, flags);
246 snd_seq_pool_delete(&client->pool);
248 return NULL; /* no free slot found or busy, return failure code */
252 static int seq_free_client1(struct snd_seq_client *client)
258 spin_lock_irqsave(&clients_lock, flags);
259 clienttablock[client->number] = 1;
260 clienttab[client->number] = NULL;
261 spin_unlock_irqrestore(&clients_lock, flags);
262 snd_seq_delete_all_ports(client);
263 snd_seq_queue_client_leave(client->number);
264 snd_use_lock_sync(&client->use_lock);
265 snd_seq_queue_client_termination(client->number);
267 snd_seq_pool_delete(&client->pool);
268 spin_lock_irqsave(&clients_lock, flags);
269 clienttablock[client->number] = 0;
270 spin_unlock_irqrestore(&clients_lock, flags);
275 static void seq_free_client(struct snd_seq_client * client)
277 mutex_lock(®ister_mutex);
278 switch (client->type) {
280 pr_warn("ALSA: seq: Trying to free unused client %d\n",
285 seq_free_client1(client);
286 usage_free(&client_usage, 1);
290 pr_err("ALSA: seq: Trying to free client %d with undefined type = %d\n",
291 client->number, client->type);
293 mutex_unlock(®ister_mutex);
295 snd_seq_system_client_ev_client_exit(client->number);
300 /* -------------------------------------------------------- */
302 /* create a user client */
303 static int snd_seq_open(struct inode *inode, struct file *file)
305 int c, mode; /* client id */
306 struct snd_seq_client *client;
307 struct snd_seq_user_client *user;
310 err = nonseekable_open(inode, file);
314 if (mutex_lock_interruptible(®ister_mutex))
316 client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS);
317 if (client == NULL) {
318 mutex_unlock(®ister_mutex);
319 return -ENOMEM; /* failure code */
322 mode = snd_seq_file_flags(file);
323 if (mode & SNDRV_SEQ_LFLG_INPUT)
324 client->accept_input = 1;
325 if (mode & SNDRV_SEQ_LFLG_OUTPUT)
326 client->accept_output = 1;
328 user = &client->data.user;
330 user->fifo_pool_size = 0;
332 if (mode & SNDRV_SEQ_LFLG_INPUT) {
333 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS;
334 user->fifo = snd_seq_fifo_new(user->fifo_pool_size);
335 if (user->fifo == NULL) {
336 seq_free_client1(client);
338 mutex_unlock(®ister_mutex);
343 usage_alloc(&client_usage, 1);
344 client->type = USER_CLIENT;
345 mutex_unlock(®ister_mutex);
348 file->private_data = client;
350 /* fill client data */
352 sprintf(client->name, "Client-%d", c);
353 client->data.user.owner = get_pid(task_pid(current));
355 /* make others aware this new client */
356 snd_seq_system_client_ev_client_start(c);
361 /* delete a user client */
362 static int snd_seq_release(struct inode *inode, struct file *file)
364 struct snd_seq_client *client = file->private_data;
367 seq_free_client(client);
368 if (client->data.user.fifo)
369 snd_seq_fifo_delete(&client->data.user.fifo);
370 put_pid(client->data.user.owner);
378 /* handle client read() */
379 /* possible error values:
380 * -ENXIO invalid client or file open mode
381 * -ENOSPC FIFO overflow (the flag is cleared after this error report)
382 * -EINVAL no enough user-space buffer to write the whole event
383 * -EFAULT seg. fault during copy to user space
385 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count,
388 struct snd_seq_client *client = file->private_data;
389 struct snd_seq_fifo *fifo;
392 struct snd_seq_event_cell *cell;
394 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT))
397 if (!access_ok(VERIFY_WRITE, buf, count))
400 /* check client structures are in place */
401 if (snd_BUG_ON(!client))
404 if (!client->accept_input || (fifo = client->data.user.fifo) == NULL)
407 if (atomic_read(&fifo->overflow) > 0) {
408 /* buffer overflow is detected */
409 snd_seq_fifo_clear(fifo);
410 /* return error code */
416 snd_seq_fifo_lock(fifo);
418 /* while data available in queue */
419 while (count >= sizeof(struct snd_seq_event)) {
422 nonblock = (file->f_flags & O_NONBLOCK) || result > 0;
423 if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) {
426 if (snd_seq_ev_is_variable(&cell->event)) {
427 struct snd_seq_event tmpev;
429 tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
430 if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) {
434 count -= sizeof(struct snd_seq_event);
435 buf += sizeof(struct snd_seq_event);
436 err = snd_seq_expand_var_event(&cell->event, count,
437 (char __force *)buf, 0,
438 sizeof(struct snd_seq_event));
445 if (copy_to_user(buf, &cell->event, sizeof(struct snd_seq_event))) {
449 count -= sizeof(struct snd_seq_event);
450 buf += sizeof(struct snd_seq_event);
452 snd_seq_cell_free(cell);
453 cell = NULL; /* to be sure */
454 result += sizeof(struct snd_seq_event);
459 snd_seq_fifo_cell_putback(fifo, cell);
460 if (err == -EAGAIN && result > 0)
463 snd_seq_fifo_unlock(fifo);
465 return (err < 0) ? err : result;
470 * check access permission to the port
472 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags)
474 if ((port->capability & flags) != flags)
480 * check if the destination client is available, and return the pointer
481 * if filter is non-zero, client filter bitmap is tested.
483 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event,
486 struct snd_seq_client *dest;
488 dest = snd_seq_client_use_ptr(event->dest.client);
491 if (! dest->accept_input)
493 if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) &&
494 ! test_bit(event->type, dest->event_filter))
496 if (filter && !(dest->filter & filter))
499 return dest; /* ok - accessible */
501 snd_seq_client_unlock(dest);
507 * Return the error event.
509 * If the receiver client is a user client, the original event is
510 * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event. If
511 * the original event is also variable length, the external data is
512 * copied after the event record.
513 * If the receiver client is a kernel client, the original event is
514 * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra
517 static int bounce_error_event(struct snd_seq_client *client,
518 struct snd_seq_event *event,
519 int err, int atomic, int hop)
521 struct snd_seq_event bounce_ev;
524 if (client == NULL ||
525 ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) ||
526 ! client->accept_input)
527 return 0; /* ignored */
529 /* set up quoted error */
530 memset(&bounce_ev, 0, sizeof(bounce_ev));
531 bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR;
532 bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED;
533 bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT;
534 bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
535 bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
536 bounce_ev.dest.client = client->number;
537 bounce_ev.dest.port = event->source.port;
538 bounce_ev.data.quote.origin = event->dest;
539 bounce_ev.data.quote.event = event;
540 bounce_ev.data.quote.value = -err; /* use positive value */
541 result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1);
543 client->event_lost++;
552 * rewrite the time-stamp of the event record with the curren time
553 * of the given queue.
554 * return non-zero if updated.
556 static int update_timestamp_of_queue(struct snd_seq_event *event,
557 int queue, int real_time)
559 struct snd_seq_queue *q;
564 event->queue = queue;
565 event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK;
567 event->time.time = snd_seq_timer_get_cur_time(q->timer);
568 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL;
570 event->time.tick = snd_seq_timer_get_cur_tick(q->timer);
571 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK;
579 * deliver an event to the specified destination.
580 * if filter is non-zero, client filter bitmap is tested.
582 * RETURN VALUE: 0 : if succeeded
585 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
586 struct snd_seq_event *event,
587 int filter, int atomic, int hop)
589 struct snd_seq_client *dest = NULL;
590 struct snd_seq_client_port *dest_port = NULL;
591 int result = -ENOENT;
594 direct = snd_seq_ev_is_direct(event);
596 dest = get_event_dest_client(event, filter);
599 dest_port = snd_seq_port_use_ptr(dest, event->dest.port);
600 if (dest_port == NULL)
603 /* check permission */
604 if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) {
609 if (dest_port->timestamping)
610 update_timestamp_of_queue(event, dest_port->time_queue,
611 dest_port->time_real);
613 switch (dest->type) {
615 if (dest->data.user.fifo)
616 result = snd_seq_fifo_event_in(dest->data.user.fifo, event);
620 if (dest_port->event_input == NULL)
622 result = dest_port->event_input(event, direct,
623 dest_port->private_data,
632 snd_seq_port_unlock(dest_port);
634 snd_seq_client_unlock(dest);
636 if (result < 0 && !direct) {
637 result = bounce_error_event(client, event, result, atomic, hop);
644 * send the event to all subscribers:
646 static int deliver_to_subscribers(struct snd_seq_client *client,
647 struct snd_seq_event *event,
650 struct snd_seq_subscribers *subs;
651 int err, result = 0, num_ev = 0;
652 struct snd_seq_event event_saved;
653 struct snd_seq_client_port *src_port;
654 struct snd_seq_port_subs_info *grp;
656 src_port = snd_seq_port_use_ptr(client, event->source.port);
657 if (src_port == NULL)
658 return -EINVAL; /* invalid source port */
659 /* save original event record */
660 event_saved = *event;
661 grp = &src_port->c_src;
665 read_lock(&grp->list_lock);
667 down_read_nested(&grp->list_mutex, hop);
668 list_for_each_entry(subs, &grp->list_head, src_list) {
669 /* both ports ready? */
670 if (atomic_read(&subs->ref_count) != 2)
672 event->dest = subs->info.dest;
673 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
674 /* convert time according to flag with subscription */
675 update_timestamp_of_queue(event, subs->info.queue,
676 subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL);
677 err = snd_seq_deliver_single_event(client, event,
680 /* save first error that occurs and continue */
686 /* restore original event record */
687 *event = event_saved;
690 read_unlock(&grp->list_lock);
692 up_read(&grp->list_mutex);
693 *event = event_saved; /* restore */
694 snd_seq_port_unlock(src_port);
695 return (result < 0) ? result : num_ev;
699 #ifdef SUPPORT_BROADCAST
701 * broadcast to all ports:
703 static int port_broadcast_event(struct snd_seq_client *client,
704 struct snd_seq_event *event,
707 int num_ev = 0, err, result = 0;
708 struct snd_seq_client *dest_client;
709 struct snd_seq_client_port *port;
711 dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST);
712 if (dest_client == NULL)
713 return 0; /* no matching destination */
715 read_lock(&dest_client->ports_lock);
716 list_for_each_entry(port, &dest_client->ports_list_head, list) {
717 event->dest.port = port->addr.port;
718 /* pass NULL as source client to avoid error bounce */
719 err = snd_seq_deliver_single_event(NULL, event,
720 SNDRV_SEQ_FILTER_BROADCAST,
723 /* save first error that occurs and continue */
730 read_unlock(&dest_client->ports_lock);
731 snd_seq_client_unlock(dest_client);
732 event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */
733 return (result < 0) ? result : num_ev;
737 * send the event to all clients:
738 * if destination port is also ADDRESS_BROADCAST, deliver to all ports.
740 static int broadcast_event(struct snd_seq_client *client,
741 struct snd_seq_event *event, int atomic, int hop)
743 int err, result = 0, num_ev = 0;
745 struct snd_seq_addr addr;
747 addr = event->dest; /* save */
749 for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) {
750 /* don't send to itself */
751 if (dest == client->number)
753 event->dest.client = dest;
754 event->dest.port = addr.port;
755 if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST)
756 err = port_broadcast_event(client, event, atomic, hop);
758 /* pass NULL as source client to avoid error bounce */
759 err = snd_seq_deliver_single_event(NULL, event,
760 SNDRV_SEQ_FILTER_BROADCAST,
763 /* save first error that occurs and continue */
770 event->dest = addr; /* restore */
771 return (result < 0) ? result : num_ev;
775 /* multicast - not supported yet */
776 static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event,
779 pr_debug("ALSA: seq: multicast not supported yet.\n");
780 return 0; /* ignored */
782 #endif /* SUPPORT_BROADCAST */
785 /* deliver an event to the destination port(s).
786 * if the event is to subscribers or broadcast, the event is dispatched
787 * to multiple targets.
789 * RETURN VALUE: n > 0 : the number of delivered events.
790 * n == 0 : the event was not passed to any client.
791 * n < 0 : error - event was not processed.
793 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event,
799 if (hop >= SNDRV_SEQ_MAX_HOPS) {
800 pr_debug("ALSA: seq: too long delivery path (%d:%d->%d:%d)\n",
801 event->source.client, event->source.port,
802 event->dest.client, event->dest.port);
806 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS ||
807 event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS)
808 result = deliver_to_subscribers(client, event, atomic, hop);
809 #ifdef SUPPORT_BROADCAST
810 else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST ||
811 event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST)
812 result = broadcast_event(client, event, atomic, hop);
813 else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS)
814 result = multicast_event(client, event, atomic, hop);
815 else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST)
816 result = port_broadcast_event(client, event, atomic, hop);
819 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop);
825 * dispatch an event cell:
826 * This function is called only from queue check routines in timer
827 * interrupts or after enqueued.
828 * The event cell shall be released or re-queued in this function.
830 * RETURN VALUE: n > 0 : the number of delivered events.
831 * n == 0 : the event was not passed to any client.
832 * n < 0 : error - event was not processed.
834 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop)
836 struct snd_seq_client *client;
839 if (snd_BUG_ON(!cell))
842 client = snd_seq_client_use_ptr(cell->event.source.client);
843 if (client == NULL) {
844 snd_seq_cell_free(cell); /* release this cell */
848 if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) {
850 * the event cell is re-used as a NOTE-OFF event and
853 struct snd_seq_event tmpev, *ev;
855 /* reserve this event to enqueue note-off later */
857 tmpev.type = SNDRV_SEQ_EVENT_NOTEON;
858 result = snd_seq_deliver_event(client, &tmpev, atomic, hop);
861 * This was originally a note event. We now re-use the
862 * cell for the note-off event.
866 ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
867 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH;
869 /* add the duration time */
870 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) {
871 case SNDRV_SEQ_TIME_STAMP_TICK:
872 ev->time.tick += ev->data.note.duration;
874 case SNDRV_SEQ_TIME_STAMP_REAL:
875 /* unit for duration is ms */
876 ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000);
877 ev->time.time.tv_sec += ev->data.note.duration / 1000 +
878 ev->time.time.tv_nsec / 1000000000;
879 ev->time.time.tv_nsec %= 1000000000;
882 ev->data.note.velocity = ev->data.note.off_velocity;
884 /* Now queue this cell as the note off event */
885 if (snd_seq_enqueue_event(cell, atomic, hop) < 0)
886 snd_seq_cell_free(cell); /* release this cell */
890 * event cell is freed after processing the event
893 result = snd_seq_deliver_event(client, &cell->event, atomic, hop);
894 snd_seq_cell_free(cell);
897 snd_seq_client_unlock(client);
902 /* Allocate a cell from client pool and enqueue it to queue:
903 * if pool is empty and blocking is TRUE, sleep until a new cell is
906 static int snd_seq_client_enqueue_event(struct snd_seq_client *client,
907 struct snd_seq_event *event,
908 struct file *file, int blocking,
910 struct mutex *mutexp)
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,
953 /* we got a cell. enqueue it. */
954 if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
955 snd_seq_cell_free(cell);
964 * check validity of event type and data length.
965 * return non-zero if invalid.
967 static int check_event_type_and_length(struct snd_seq_event *ev)
969 switch (snd_seq_ev_length_type(ev)) {
970 case SNDRV_SEQ_EVENT_LENGTH_FIXED:
971 if (snd_seq_ev_is_variable_type(ev))
974 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
975 if (! snd_seq_ev_is_variable_type(ev) ||
976 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
979 case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
980 if (! snd_seq_ev_is_direct(ev))
989 /* possible error values:
990 * -ENXIO invalid client or file open mode
991 * -ENOMEM malloc failed
992 * -EFAULT seg. fault during copy from user space
993 * -EINVAL invalid event
994 * -EAGAIN no space in output pool
995 * -EINTR interrupts while sleep
996 * -EMLINK too many hops
997 * others depends on return value from driver callback
999 static ssize_t snd_seq_write(struct file *file, const char __user *buf,
1000 size_t count, loff_t *offset)
1002 struct snd_seq_client *client = file->private_data;
1003 int written = 0, len;
1005 struct snd_seq_event event;
1007 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
1010 /* check client structures are in place */
1011 if (snd_BUG_ON(!client))
1014 if (!client->accept_output || client->pool == NULL)
1017 /* allocate the pool now if the pool is not allocated yet */
1018 mutex_lock(&client->ioctl_mutex);
1019 if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
1020 err = snd_seq_pool_init(client->pool);
1025 /* only process whole events */
1027 while (count >= sizeof(struct snd_seq_event)) {
1028 /* Read in the event header from the user */
1029 len = sizeof(event);
1030 if (copy_from_user(&event, buf, len)) {
1034 event.source.client = client->number; /* fill in client number */
1035 /* Check for extension data length */
1036 if (check_event_type_and_length(&event)) {
1041 /* check for special events */
1042 if (event.type == SNDRV_SEQ_EVENT_NONE)
1044 else if (snd_seq_ev_is_reserved(&event)) {
1049 if (snd_seq_ev_is_variable(&event)) {
1050 int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK;
1051 if ((size_t)(extlen + len) > count) {
1052 /* back out, will get an error this time or next */
1056 /* set user space pointer */
1057 event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
1058 event.data.ext.ptr = (char __force *)buf
1059 + sizeof(struct snd_seq_event);
1060 len += extlen; /* increment data length */
1062 #ifdef CONFIG_COMPAT
1063 if (client->convert32 && snd_seq_ev_is_varusr(&event)) {
1064 void *ptr = (void __force *)compat_ptr(event.data.raw32.d[1]);
1065 event.data.ext.ptr = ptr;
1070 /* ok, enqueue it */
1071 err = snd_seq_client_enqueue_event(client, &event, file,
1072 !(file->f_flags & O_NONBLOCK),
1073 0, 0, &client->ioctl_mutex);
1078 /* Update pointers and counts */
1085 mutex_unlock(&client->ioctl_mutex);
1086 return written ? written : err;
1093 static unsigned int snd_seq_poll(struct file *file, poll_table * wait)
1095 struct snd_seq_client *client = file->private_data;
1096 unsigned int mask = 0;
1098 /* check client structures are in place */
1099 if (snd_BUG_ON(!client))
1102 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1103 client->data.user.fifo) {
1105 /* check if data is available in the outqueue */
1106 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
1107 mask |= POLLIN | POLLRDNORM;
1110 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1112 /* check if data is available in the pool */
1113 if (!snd_seq_write_pool_allocated(client) ||
1114 snd_seq_pool_poll_wait(client->pool, file, wait))
1115 mask |= POLLOUT | POLLWRNORM;
1122 /*-----------------------------------------------------*/
1124 static int snd_seq_ioctl_pversion(struct snd_seq_client *client, void *arg)
1126 int *pversion = arg;
1128 *pversion = SNDRV_SEQ_VERSION;
1132 static int snd_seq_ioctl_client_id(struct snd_seq_client *client, void *arg)
1134 int *client_id = arg;
1136 *client_id = client->number;
1140 /* SYSTEM_INFO ioctl() */
1141 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void *arg)
1143 struct snd_seq_system_info *info = arg;
1145 memset(info, 0, sizeof(*info));
1146 /* fill the info fields */
1147 info->queues = SNDRV_SEQ_MAX_QUEUES;
1148 info->clients = SNDRV_SEQ_MAX_CLIENTS;
1149 info->ports = SNDRV_SEQ_MAX_PORTS;
1150 info->channels = 256; /* fixed limit */
1151 info->cur_clients = client_usage.cur;
1152 info->cur_queues = snd_seq_queue_get_cur_queues();
1158 /* RUNNING_MODE ioctl() */
1159 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void *arg)
1161 struct snd_seq_running_info *info = arg;
1162 struct snd_seq_client *cptr;
1165 /* requested client number */
1166 cptr = snd_seq_client_use_ptr(info->client);
1168 return -ENOENT; /* don't change !!! */
1170 #ifdef SNDRV_BIG_ENDIAN
1171 if (!info->big_endian) {
1176 if (info->big_endian) {
1182 if (info->cpu_mode > sizeof(long)) {
1186 cptr->convert32 = (info->cpu_mode < sizeof(long));
1188 snd_seq_client_unlock(cptr);
1192 /* CLIENT_INFO ioctl() */
1193 static void get_client_info(struct snd_seq_client *cptr,
1194 struct snd_seq_client_info *info)
1196 info->client = cptr->number;
1198 /* fill the info fields */
1199 info->type = cptr->type;
1200 strcpy(info->name, cptr->name);
1201 info->filter = cptr->filter;
1202 info->event_lost = cptr->event_lost;
1203 memcpy(info->event_filter, cptr->event_filter, 32);
1204 info->num_ports = cptr->num_ports;
1206 if (cptr->type == USER_CLIENT)
1207 info->pid = pid_vnr(cptr->data.user.owner);
1211 if (cptr->type == KERNEL_CLIENT)
1212 info->card = cptr->data.kernel.card ? cptr->data.kernel.card->number : -1;
1216 memset(info->reserved, 0, sizeof(info->reserved));
1219 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
1222 struct snd_seq_client_info *client_info = arg;
1223 struct snd_seq_client *cptr;
1225 /* requested client number */
1226 cptr = snd_seq_client_use_ptr(client_info->client);
1228 return -ENOENT; /* don't change !!! */
1230 get_client_info(cptr, client_info);
1231 snd_seq_client_unlock(cptr);
1237 /* CLIENT_INFO ioctl() */
1238 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
1241 struct snd_seq_client_info *client_info = arg;
1243 /* it is not allowed to set the info fields for an another client */
1244 if (client->number != client_info->client)
1246 /* also client type must be set now */
1247 if (client->type != client_info->type)
1250 /* fill the info fields */
1251 if (client_info->name[0])
1252 strlcpy(client->name, client_info->name, sizeof(client->name));
1254 client->filter = client_info->filter;
1255 client->event_lost = client_info->event_lost;
1256 memcpy(client->event_filter, client_info->event_filter, 32);
1263 * CREATE PORT ioctl()
1265 static int snd_seq_ioctl_create_port(struct snd_seq_client *client, void *arg)
1267 struct snd_seq_port_info *info = arg;
1268 struct snd_seq_client_port *port;
1269 struct snd_seq_port_callback *callback;
1272 /* it is not allowed to create the port for an another client */
1273 if (info->addr.client != client->number)
1276 port = snd_seq_create_port(client, (info->flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info->addr.port : -1);
1280 if (client->type == USER_CLIENT && info->kernel) {
1281 port_idx = port->addr.port;
1282 snd_seq_port_unlock(port);
1283 snd_seq_delete_port(client, port_idx);
1286 if (client->type == KERNEL_CLIENT) {
1287 if ((callback = info->kernel) != NULL) {
1288 if (callback->owner)
1289 port->owner = callback->owner;
1290 port->private_data = callback->private_data;
1291 port->private_free = callback->private_free;
1292 port->event_input = callback->event_input;
1293 port->c_src.open = callback->subscribe;
1294 port->c_src.close = callback->unsubscribe;
1295 port->c_dest.open = callback->use;
1296 port->c_dest.close = callback->unuse;
1300 info->addr = port->addr;
1302 snd_seq_set_port_info(port, info);
1303 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1304 snd_seq_port_unlock(port);
1310 * DELETE PORT ioctl()
1312 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client, void *arg)
1314 struct snd_seq_port_info *info = arg;
1317 /* it is not allowed to remove the port for an another client */
1318 if (info->addr.client != client->number)
1321 err = snd_seq_delete_port(client, info->addr.port);
1323 snd_seq_system_client_ev_port_exit(client->number, info->addr.port);
1329 * GET_PORT_INFO ioctl() (on any client)
1331 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client, void *arg)
1333 struct snd_seq_port_info *info = arg;
1334 struct snd_seq_client *cptr;
1335 struct snd_seq_client_port *port;
1337 cptr = snd_seq_client_use_ptr(info->addr.client);
1341 port = snd_seq_port_use_ptr(cptr, info->addr.port);
1343 snd_seq_client_unlock(cptr);
1344 return -ENOENT; /* don't change */
1348 snd_seq_get_port_info(port, info);
1349 snd_seq_port_unlock(port);
1350 snd_seq_client_unlock(cptr);
1357 * SET_PORT_INFO ioctl() (only ports on this/own client)
1359 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client, void *arg)
1361 struct snd_seq_port_info *info = arg;
1362 struct snd_seq_client_port *port;
1364 if (info->addr.client != client->number) /* only set our own ports ! */
1366 port = snd_seq_port_use_ptr(client, info->addr.port);
1368 snd_seq_set_port_info(port, info);
1369 snd_seq_port_unlock(port);
1376 * port subscription (connection)
1378 #define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1379 #define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1381 static int check_subscription_permission(struct snd_seq_client *client,
1382 struct snd_seq_client_port *sport,
1383 struct snd_seq_client_port *dport,
1384 struct snd_seq_port_subscribe *subs)
1386 if (client->number != subs->sender.client &&
1387 client->number != subs->dest.client) {
1388 /* connection by third client - check export permission */
1389 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1391 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1395 /* check read permission */
1396 /* if sender or receiver is the subscribing client itself,
1397 * no permission check is necessary
1399 if (client->number != subs->sender.client) {
1400 if (! check_port_perm(sport, PERM_RD))
1403 /* check write permission */
1404 if (client->number != subs->dest.client) {
1405 if (! check_port_perm(dport, PERM_WR))
1412 * send an subscription notify event to user client:
1413 * client must be user client.
1415 int snd_seq_client_notify_subscription(int client, int port,
1416 struct snd_seq_port_subscribe *info,
1419 struct snd_seq_event event;
1421 memset(&event, 0, sizeof(event));
1422 event.type = evtype;
1423 event.data.connect.dest = info->dest;
1424 event.data.connect.sender = info->sender;
1426 return snd_seq_system_notify(client, port, &event); /* non-atomic */
1431 * add to port's subscription list IOCTL interface
1433 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
1436 struct snd_seq_port_subscribe *subs = arg;
1437 int result = -EINVAL;
1438 struct snd_seq_client *receiver = NULL, *sender = NULL;
1439 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1441 if ((receiver = snd_seq_client_use_ptr(subs->dest.client)) == NULL)
1443 if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1445 if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1447 if ((dport = snd_seq_port_use_ptr(receiver, subs->dest.port)) == NULL)
1450 result = check_subscription_permission(client, sport, dport, subs);
1455 result = snd_seq_port_connect(client, sender, sport, receiver, dport, subs);
1456 if (! result) /* broadcast announce */
1457 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1458 subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1461 snd_seq_port_unlock(sport);
1463 snd_seq_port_unlock(dport);
1465 snd_seq_client_unlock(sender);
1467 snd_seq_client_unlock(receiver);
1473 * remove from port's subscription list
1475 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
1478 struct snd_seq_port_subscribe *subs = arg;
1479 int result = -ENXIO;
1480 struct snd_seq_client *receiver = NULL, *sender = NULL;
1481 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1483 if ((receiver = snd_seq_client_use_ptr(subs->dest.client)) == NULL)
1485 if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1487 if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1489 if ((dport = snd_seq_port_use_ptr(receiver, subs->dest.port)) == NULL)
1492 result = check_subscription_permission(client, sport, dport, subs);
1496 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, subs);
1497 if (! result) /* broadcast announce */
1498 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1499 subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1502 snd_seq_port_unlock(sport);
1504 snd_seq_port_unlock(dport);
1506 snd_seq_client_unlock(sender);
1508 snd_seq_client_unlock(receiver);
1513 /* CREATE_QUEUE ioctl() */
1514 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client, void *arg)
1516 struct snd_seq_queue_info *info = arg;
1517 struct snd_seq_queue *q;
1519 q = snd_seq_queue_alloc(client->number, info->locked, info->flags);
1523 info->queue = q->queue;
1524 info->locked = q->locked;
1525 info->owner = q->owner;
1527 /* set queue name */
1529 snprintf(info->name, sizeof(info->name), "Queue-%d", q->queue);
1530 strlcpy(q->name, info->name, sizeof(q->name));
1531 snd_use_lock_free(&q->use_lock);
1536 /* DELETE_QUEUE ioctl() */
1537 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client, void *arg)
1539 struct snd_seq_queue_info *info = arg;
1541 return snd_seq_queue_delete(client->number, info->queue);
1544 /* GET_QUEUE_INFO ioctl() */
1545 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client,
1548 struct snd_seq_queue_info *info = arg;
1549 struct snd_seq_queue *q;
1551 q = queueptr(info->queue);
1555 memset(info, 0, sizeof(*info));
1556 info->queue = q->queue;
1557 info->owner = q->owner;
1558 info->locked = q->locked;
1559 strlcpy(info->name, q->name, sizeof(info->name));
1565 /* SET_QUEUE_INFO ioctl() */
1566 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
1569 struct snd_seq_queue_info *info = arg;
1570 struct snd_seq_queue *q;
1572 if (info->owner != client->number)
1575 /* change owner/locked permission */
1576 if (snd_seq_queue_check_access(info->queue, client->number)) {
1577 if (snd_seq_queue_set_owner(info->queue, client->number, info->locked) < 0)
1580 snd_seq_queue_use(info->queue, client->number, 1);
1585 q = queueptr(info->queue);
1588 if (q->owner != client->number) {
1592 strlcpy(q->name, info->name, sizeof(q->name));
1598 /* GET_NAMED_QUEUE ioctl() */
1599 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client,
1602 struct snd_seq_queue_info *info = arg;
1603 struct snd_seq_queue *q;
1605 q = snd_seq_queue_find_name(info->name);
1608 info->queue = q->queue;
1609 info->owner = q->owner;
1610 info->locked = q->locked;
1616 /* GET_QUEUE_STATUS ioctl() */
1617 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
1620 struct snd_seq_queue_status *status = arg;
1621 struct snd_seq_queue *queue;
1622 struct snd_seq_timer *tmr;
1624 queue = queueptr(status->queue);
1627 memset(status, 0, sizeof(*status));
1628 status->queue = queue->queue;
1631 status->events = queue->tickq->cells + queue->timeq->cells;
1633 status->time = snd_seq_timer_get_cur_time(tmr);
1634 status->tick = snd_seq_timer_get_cur_tick(tmr);
1636 status->running = tmr->running;
1638 status->flags = queue->flags;
1645 /* GET_QUEUE_TEMPO ioctl() */
1646 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
1649 struct snd_seq_queue_tempo *tempo = arg;
1650 struct snd_seq_queue *queue;
1651 struct snd_seq_timer *tmr;
1653 queue = queueptr(tempo->queue);
1656 memset(tempo, 0, sizeof(*tempo));
1657 tempo->queue = queue->queue;
1661 tempo->tempo = tmr->tempo;
1662 tempo->ppq = tmr->ppq;
1663 tempo->skew_value = tmr->skew;
1664 tempo->skew_base = tmr->skew_base;
1671 /* SET_QUEUE_TEMPO ioctl() */
1672 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1674 if (!snd_seq_queue_check_access(tempo->queue, client))
1676 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1678 EXPORT_SYMBOL(snd_seq_set_queue_tempo);
1680 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
1683 struct snd_seq_queue_tempo *tempo = arg;
1686 result = snd_seq_set_queue_tempo(client->number, tempo);
1687 return result < 0 ? result : 0;
1691 /* GET_QUEUE_TIMER ioctl() */
1692 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
1695 struct snd_seq_queue_timer *timer = arg;
1696 struct snd_seq_queue *queue;
1697 struct snd_seq_timer *tmr;
1699 queue = queueptr(timer->queue);
1703 if (mutex_lock_interruptible(&queue->timer_mutex)) {
1705 return -ERESTARTSYS;
1708 memset(timer, 0, sizeof(*timer));
1709 timer->queue = queue->queue;
1711 timer->type = tmr->type;
1712 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1713 timer->u.alsa.id = tmr->alsa_id;
1714 timer->u.alsa.resolution = tmr->preferred_resolution;
1716 mutex_unlock(&queue->timer_mutex);
1723 /* SET_QUEUE_TIMER ioctl() */
1724 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
1727 struct snd_seq_queue_timer *timer = arg;
1730 if (timer->type != SNDRV_SEQ_TIMER_ALSA)
1733 if (snd_seq_queue_check_access(timer->queue, client->number)) {
1734 struct snd_seq_queue *q;
1735 struct snd_seq_timer *tmr;
1737 q = queueptr(timer->queue);
1740 if (mutex_lock_interruptible(&q->timer_mutex)) {
1742 return -ERESTARTSYS;
1745 snd_seq_queue_timer_close(timer->queue);
1746 tmr->type = timer->type;
1747 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1748 tmr->alsa_id = timer->u.alsa.id;
1749 tmr->preferred_resolution = timer->u.alsa.resolution;
1751 result = snd_seq_queue_timer_open(timer->queue);
1752 mutex_unlock(&q->timer_mutex);
1762 /* GET_QUEUE_CLIENT ioctl() */
1763 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
1766 struct snd_seq_queue_client *info = arg;
1769 used = snd_seq_queue_is_used(info->queue, client->number);
1773 info->client = client->number;
1779 /* SET_QUEUE_CLIENT ioctl() */
1780 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
1783 struct snd_seq_queue_client *info = arg;
1786 if (info->used >= 0) {
1787 err = snd_seq_queue_use(info->queue, client->number, info->used);
1792 return snd_seq_ioctl_get_queue_client(client, arg);
1796 /* GET_CLIENT_POOL ioctl() */
1797 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
1800 struct snd_seq_client_pool *info = arg;
1801 struct snd_seq_client *cptr;
1803 cptr = snd_seq_client_use_ptr(info->client);
1806 memset(info, 0, sizeof(*info));
1807 info->client = cptr->number;
1808 info->output_pool = cptr->pool->size;
1809 info->output_room = cptr->pool->room;
1810 info->output_free = info->output_pool;
1811 info->output_free = snd_seq_unused_cells(cptr->pool);
1812 if (cptr->type == USER_CLIENT) {
1813 info->input_pool = cptr->data.user.fifo_pool_size;
1814 info->input_free = info->input_pool;
1815 if (cptr->data.user.fifo)
1816 info->input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool);
1818 info->input_pool = 0;
1819 info->input_free = 0;
1821 snd_seq_client_unlock(cptr);
1826 /* SET_CLIENT_POOL ioctl() */
1827 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
1830 struct snd_seq_client_pool *info = arg;
1833 if (client->number != info->client)
1834 return -EINVAL; /* can't change other clients */
1836 if (info->output_pool >= 1 && info->output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1837 (! snd_seq_write_pool_allocated(client) ||
1838 info->output_pool != client->pool->size)) {
1839 if (snd_seq_write_pool_allocated(client)) {
1840 /* is the pool in use? */
1841 if (atomic_read(&client->pool->counter))
1843 /* remove all existing cells */
1844 snd_seq_pool_mark_closing(client->pool);
1845 snd_seq_queue_client_leave_cells(client->number);
1846 snd_seq_pool_done(client->pool);
1848 client->pool->size = info->output_pool;
1849 rc = snd_seq_pool_init(client->pool);
1853 if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
1854 info->input_pool >= 1 &&
1855 info->input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1856 info->input_pool != client->data.user.fifo_pool_size) {
1857 /* change pool size */
1858 rc = snd_seq_fifo_resize(client->data.user.fifo, info->input_pool);
1861 client->data.user.fifo_pool_size = info->input_pool;
1863 if (info->output_room >= 1 &&
1864 info->output_room <= client->pool->size) {
1865 client->pool->room = info->output_room;
1868 return snd_seq_ioctl_get_client_pool(client, arg);
1872 /* REMOVE_EVENTS ioctl() */
1873 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
1876 struct snd_seq_remove_events *info = arg;
1879 * Input mostly not implemented XXX.
1881 if (info->remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1883 * No restrictions so for a user client we can clear
1886 if (client->type == USER_CLIENT && client->data.user.fifo)
1887 snd_seq_fifo_clear(client->data.user.fifo);
1890 if (info->remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1891 snd_seq_queue_remove_cells(client->number, info);
1898 * get subscription info
1900 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
1903 struct snd_seq_port_subscribe *subs = arg;
1905 struct snd_seq_client *sender = NULL;
1906 struct snd_seq_client_port *sport = NULL;
1907 struct snd_seq_subscribers *p;
1910 if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1912 if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1914 p = snd_seq_port_get_subscription(&sport->c_src, &subs->dest);
1923 snd_seq_port_unlock(sport);
1925 snd_seq_client_unlock(sender);
1932 * get subscription info - check only its presence
1934 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client, void *arg)
1936 struct snd_seq_query_subs *subs = arg;
1937 int result = -ENXIO;
1938 struct snd_seq_client *cptr = NULL;
1939 struct snd_seq_client_port *port = NULL;
1940 struct snd_seq_port_subs_info *group;
1941 struct list_head *p;
1944 if ((cptr = snd_seq_client_use_ptr(subs->root.client)) == NULL)
1946 if ((port = snd_seq_port_use_ptr(cptr, subs->root.port)) == NULL)
1949 switch (subs->type) {
1950 case SNDRV_SEQ_QUERY_SUBS_READ:
1951 group = &port->c_src;
1953 case SNDRV_SEQ_QUERY_SUBS_WRITE:
1954 group = &port->c_dest;
1960 down_read(&group->list_mutex);
1961 /* search for the subscriber */
1962 subs->num_subs = group->count;
1965 list_for_each(p, &group->list_head) {
1966 if (i++ == subs->index) {
1968 struct snd_seq_subscribers *s;
1969 if (subs->type == SNDRV_SEQ_QUERY_SUBS_READ) {
1970 s = list_entry(p, struct snd_seq_subscribers, src_list);
1971 subs->addr = s->info.dest;
1973 s = list_entry(p, struct snd_seq_subscribers, dest_list);
1974 subs->addr = s->info.sender;
1976 subs->flags = s->info.flags;
1977 subs->queue = s->info.queue;
1982 up_read(&group->list_mutex);
1986 snd_seq_port_unlock(port);
1988 snd_seq_client_unlock(cptr);
1997 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
2000 struct snd_seq_client_info *info = arg;
2001 struct snd_seq_client *cptr = NULL;
2003 /* search for next client */
2005 if (info->client < 0)
2007 for (; info->client < SNDRV_SEQ_MAX_CLIENTS; info->client++) {
2008 cptr = snd_seq_client_use_ptr(info->client);
2015 get_client_info(cptr, info);
2016 snd_seq_client_unlock(cptr);
2024 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
2027 struct snd_seq_port_info *info = arg;
2028 struct snd_seq_client *cptr;
2029 struct snd_seq_client_port *port = NULL;
2031 cptr = snd_seq_client_use_ptr(info->addr.client);
2035 /* search for next port */
2037 port = snd_seq_port_query_nearest(cptr, info);
2039 snd_seq_client_unlock(cptr);
2044 info->addr = port->addr;
2045 snd_seq_get_port_info(port, info);
2046 snd_seq_port_unlock(port);
2047 snd_seq_client_unlock(cptr);
2052 /* -------------------------------------------------------- */
2054 static const struct ioctl_handler {
2056 int (*func)(struct snd_seq_client *client, void *arg);
2057 } ioctl_handlers[] = {
2058 { SNDRV_SEQ_IOCTL_PVERSION, snd_seq_ioctl_pversion },
2059 { SNDRV_SEQ_IOCTL_CLIENT_ID, snd_seq_ioctl_client_id },
2060 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2061 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2062 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2063 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2064 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2065 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2066 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2067 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2068 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2069 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2070 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2071 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2072 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2073 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2074 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2075 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2076 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2077 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2078 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2079 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2080 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2081 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2082 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2083 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2084 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2085 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2086 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2087 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2088 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2092 static long snd_seq_ioctl(struct file *file, unsigned int cmd,
2095 struct snd_seq_client *client = file->private_data;
2096 /* To use kernel stack for ioctl data. */
2100 struct snd_seq_system_info system_info;
2101 struct snd_seq_running_info running_info;
2102 struct snd_seq_client_info client_info;
2103 struct snd_seq_port_info port_info;
2104 struct snd_seq_port_subscribe port_subscribe;
2105 struct snd_seq_queue_info queue_info;
2106 struct snd_seq_queue_status queue_status;
2107 struct snd_seq_queue_tempo tempo;
2108 struct snd_seq_queue_timer queue_timer;
2109 struct snd_seq_queue_client queue_client;
2110 struct snd_seq_client_pool client_pool;
2111 struct snd_seq_remove_events remove_events;
2112 struct snd_seq_query_subs query_subs;
2114 const struct ioctl_handler *handler;
2118 if (snd_BUG_ON(!client))
2121 for (handler = ioctl_handlers; handler->cmd > 0; ++handler) {
2122 if (handler->cmd == cmd)
2125 if (handler->cmd == 0)
2128 memset(&buf, 0, sizeof(buf));
2131 * All of ioctl commands for ALSA sequencer get an argument of size
2132 * within 13 bits. We can safely pick up the size from the command.
2134 size = _IOC_SIZE(handler->cmd);
2135 if (handler->cmd & IOC_IN) {
2136 if (copy_from_user(&buf, (const void __user *)arg, size))
2140 mutex_lock(&client->ioctl_mutex);
2141 err = handler->func(client, &buf);
2142 mutex_unlock(&client->ioctl_mutex);
2144 /* Some commands includes a bug in 'dir' field. */
2145 if (handler->cmd == SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT ||
2146 handler->cmd == SNDRV_SEQ_IOCTL_SET_CLIENT_POOL ||
2147 (handler->cmd & IOC_OUT))
2148 if (copy_to_user((void __user *)arg, &buf, size))
2155 #ifdef CONFIG_COMPAT
2156 #include "seq_compat.c"
2158 #define snd_seq_ioctl_compat NULL
2161 /* -------------------------------------------------------- */
2164 /* exported to kernel modules */
2165 int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
2166 const char *name_fmt, ...)
2168 struct snd_seq_client *client;
2171 if (snd_BUG_ON(in_interrupt()))
2174 if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD)
2176 if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
2179 if (mutex_lock_interruptible(®ister_mutex))
2180 return -ERESTARTSYS;
2183 client_index += SNDRV_SEQ_GLOBAL_CLIENTS
2184 + card->number * SNDRV_SEQ_CLIENTS_PER_CARD;
2185 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN)
2189 /* empty write queue as default */
2190 client = seq_create_client1(client_index, 0);
2191 if (client == NULL) {
2192 mutex_unlock(®ister_mutex);
2193 return -EBUSY; /* failure code */
2195 usage_alloc(&client_usage, 1);
2197 client->accept_input = 1;
2198 client->accept_output = 1;
2199 client->data.kernel.card = card;
2201 va_start(args, name_fmt);
2202 vsnprintf(client->name, sizeof(client->name), name_fmt, args);
2205 client->type = KERNEL_CLIENT;
2206 mutex_unlock(®ister_mutex);
2208 /* make others aware this new client */
2209 snd_seq_system_client_ev_client_start(client->number);
2211 /* return client number to caller */
2212 return client->number;
2214 EXPORT_SYMBOL(snd_seq_create_kernel_client);
2216 /* exported to kernel modules */
2217 int snd_seq_delete_kernel_client(int client)
2219 struct snd_seq_client *ptr;
2221 if (snd_BUG_ON(in_interrupt()))
2224 ptr = clientptr(client);
2228 seq_free_client(ptr);
2232 EXPORT_SYMBOL(snd_seq_delete_kernel_client);
2234 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue
2235 * and snd_seq_kernel_client_enqueue_blocking
2237 static int kernel_client_enqueue(int client, struct snd_seq_event *ev,
2238 struct file *file, int blocking,
2239 int atomic, int hop)
2241 struct snd_seq_client *cptr;
2244 if (snd_BUG_ON(!ev))
2247 if (ev->type == SNDRV_SEQ_EVENT_NONE)
2248 return 0; /* ignore this */
2249 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2250 return -EINVAL; /* quoted events can't be enqueued */
2252 /* fill in client number */
2253 ev->source.client = client;
2255 if (check_event_type_and_length(ev))
2258 cptr = snd_seq_client_use_ptr(client);
2262 if (! cptr->accept_output)
2265 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking,
2268 snd_seq_client_unlock(cptr);
2273 * exported, called by kernel clients to enqueue events (w/o blocking)
2275 * RETURN VALUE: zero if succeed, negative if error
2277 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev,
2278 int atomic, int hop)
2280 return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop);
2282 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
2285 * exported, called by kernel clients to enqueue events (with blocking)
2287 * RETURN VALUE: zero if succeed, negative if error
2289 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev,
2291 int atomic, int hop)
2293 return kernel_client_enqueue(client, ev, file, 1, atomic, hop);
2295 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking);
2298 * exported, called by kernel clients to dispatch events directly to other
2299 * clients, bypassing the queues. Event time-stamp will be updated.
2301 * RETURN VALUE: negative = delivery failed,
2302 * zero, or positive: the number of delivered events
2304 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev,
2305 int atomic, int hop)
2307 struct snd_seq_client *cptr;
2310 if (snd_BUG_ON(!ev))
2313 /* fill in client number */
2314 ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2315 ev->source.client = client;
2317 if (check_event_type_and_length(ev))
2320 cptr = snd_seq_client_use_ptr(client);
2324 if (!cptr->accept_output)
2327 result = snd_seq_deliver_event(cptr, ev, atomic, hop);
2329 snd_seq_client_unlock(cptr);
2332 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch);
2335 * snd_seq_kernel_client_ctl - operate a command for a client with data in
2337 * @clientid: A numerical ID for a client.
2338 * @cmd: An ioctl(2) command for ALSA sequencer operation.
2339 * @arg: A pointer to data in kernel space.
2341 * Against its name, both kernel/application client can be handled by this
2342 * kernel API. A pointer of 'arg' argument should be in kernel space.
2344 * Return: 0 at success. Negative error code at failure.
2346 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2348 const struct ioctl_handler *handler;
2349 struct snd_seq_client *client;
2351 client = clientptr(clientid);
2355 for (handler = ioctl_handlers; handler->cmd > 0; ++handler) {
2356 if (handler->cmd == cmd)
2357 return handler->func(client, arg);
2360 pr_debug("ALSA: seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n",
2361 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2364 EXPORT_SYMBOL(snd_seq_kernel_client_ctl);
2366 /* exported (for OSS emulator) */
2367 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2369 struct snd_seq_client *client;
2371 client = clientptr(clientid);
2375 if (! snd_seq_write_pool_allocated(client))
2377 if (snd_seq_pool_poll_wait(client->pool, file, wait))
2381 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll);
2383 /*---------------------------------------------------------------------------*/
2385 #ifdef CONFIG_SND_PROC_FS
2389 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer,
2390 struct snd_seq_port_subs_info *group,
2391 int is_src, char *msg)
2393 struct list_head *p;
2394 struct snd_seq_subscribers *s;
2397 down_read(&group->list_mutex);
2398 if (list_empty(&group->list_head)) {
2399 up_read(&group->list_mutex);
2402 snd_iprintf(buffer, msg);
2403 list_for_each(p, &group->list_head) {
2405 s = list_entry(p, struct snd_seq_subscribers, src_list);
2407 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2409 snd_iprintf(buffer, ", ");
2410 snd_iprintf(buffer, "%d:%d",
2411 is_src ? s->info.dest.client : s->info.sender.client,
2412 is_src ? s->info.dest.port : s->info.sender.port);
2413 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
2414 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
2415 if (group->exclusive)
2416 snd_iprintf(buffer, "[ex]");
2418 up_read(&group->list_mutex);
2419 snd_iprintf(buffer, "\n");
2422 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
2423 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
2424 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
2426 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2428 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
2429 struct snd_seq_client *client)
2431 struct snd_seq_client_port *p;
2433 mutex_lock(&client->ports_mutex);
2434 list_for_each_entry(p, &client->ports_list_head, list) {
2435 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c)\n",
2436 p->addr.port, p->name,
2437 FLAG_PERM_RD(p->capability),
2438 FLAG_PERM_WR(p->capability),
2439 FLAG_PERM_EX(p->capability),
2440 FLAG_PERM_DUPLEX(p->capability));
2441 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: ");
2442 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: ");
2444 mutex_unlock(&client->ports_mutex);
2448 /* exported to seq_info.c */
2449 void snd_seq_info_clients_read(struct snd_info_entry *entry,
2450 struct snd_info_buffer *buffer)
2453 struct snd_seq_client *client;
2455 snd_iprintf(buffer, "Client info\n");
2456 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur);
2457 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak);
2458 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
2459 snd_iprintf(buffer, "\n");
2461 /* list the client table */
2462 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2463 client = snd_seq_client_use_ptr(c);
2466 if (client->type == NO_CLIENT) {
2467 snd_seq_client_unlock(client);
2471 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n",
2473 client->type == USER_CLIENT ? "User" : "Kernel");
2474 snd_seq_info_dump_ports(buffer, client);
2475 if (snd_seq_write_pool_allocated(client)) {
2476 snd_iprintf(buffer, " Output pool :\n");
2477 snd_seq_info_pool(buffer, client->pool, " ");
2479 if (client->type == USER_CLIENT && client->data.user.fifo &&
2480 client->data.user.fifo->pool) {
2481 snd_iprintf(buffer, " Input pool :\n");
2482 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " ");
2484 snd_seq_client_unlock(client);
2487 #endif /* CONFIG_SND_PROC_FS */
2489 /*---------------------------------------------------------------------------*/
2496 static const struct file_operations snd_seq_f_ops =
2498 .owner = THIS_MODULE,
2499 .read = snd_seq_read,
2500 .write = snd_seq_write,
2501 .open = snd_seq_open,
2502 .release = snd_seq_release,
2503 .llseek = no_llseek,
2504 .poll = snd_seq_poll,
2505 .unlocked_ioctl = snd_seq_ioctl,
2506 .compat_ioctl = snd_seq_ioctl_compat,
2509 static struct device seq_dev;
2512 * register sequencer device
2514 int __init snd_sequencer_device_init(void)
2518 snd_device_initialize(&seq_dev, NULL);
2519 dev_set_name(&seq_dev, "seq");
2521 if (mutex_lock_interruptible(®ister_mutex))
2522 return -ERESTARTSYS;
2524 err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
2525 &snd_seq_f_ops, NULL, &seq_dev);
2527 mutex_unlock(®ister_mutex);
2528 put_device(&seq_dev);
2532 mutex_unlock(®ister_mutex);
2540 * unregister sequencer device
2542 void __exit snd_sequencer_device_done(void)
2544 snd_unregister_device(&seq_dev);
2545 put_device(&seq_dev);