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 DECLARE_BITMAP(client_requested, SNDRV_SEQ_GLOBAL_CLIENTS);
140 static DECLARE_BITMAP(card_requested, SNDRV_CARDS);
142 if (clientid < SNDRV_SEQ_GLOBAL_CLIENTS) {
145 if (!test_and_set_bit(clientid, client_requested)) {
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 (!test_and_set_bit(card, card_requested))
161 snd_request_card(card);
162 snd_seq_device_load_drivers();
165 spin_lock_irqsave(&clients_lock, flags);
166 client = clientptr(clientid);
169 spin_unlock_irqrestore(&clients_lock, flags);
175 snd_use_lock_use(&client->use_lock);
176 spin_unlock_irqrestore(&clients_lock, flags);
180 static void usage_alloc(struct snd_seq_usage *res, int num)
183 if (res->cur > res->peak)
184 res->peak = res->cur;
187 static void usage_free(struct snd_seq_usage *res, int num)
192 /* initialise data structures */
193 int __init client_init_data(void)
195 /* zap out the client table */
196 memset(&clienttablock, 0, sizeof(clienttablock));
197 memset(&clienttab, 0, sizeof(clienttab));
202 static struct snd_seq_client *seq_create_client1(int client_index, int poolsize)
206 struct snd_seq_client *client;
208 /* init client data */
209 client = kzalloc(sizeof(*client), GFP_KERNEL);
212 client->pool = snd_seq_pool_new(poolsize);
213 if (client->pool == NULL) {
217 client->type = NO_CLIENT;
218 snd_use_lock_init(&client->use_lock);
219 rwlock_init(&client->ports_lock);
220 mutex_init(&client->ports_mutex);
221 INIT_LIST_HEAD(&client->ports_list_head);
222 mutex_init(&client->ioctl_mutex);
224 /* find free slot in the client table */
225 spin_lock_irqsave(&clients_lock, flags);
226 if (client_index < 0) {
227 for (c = SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN;
228 c < SNDRV_SEQ_MAX_CLIENTS;
230 if (clienttab[c] || clienttablock[c])
232 clienttab[client->number = c] = client;
233 spin_unlock_irqrestore(&clients_lock, flags);
237 if (clienttab[client_index] == NULL && !clienttablock[client_index]) {
238 clienttab[client->number = client_index] = client;
239 spin_unlock_irqrestore(&clients_lock, flags);
243 spin_unlock_irqrestore(&clients_lock, flags);
244 snd_seq_pool_delete(&client->pool);
246 return NULL; /* no free slot found or busy, return failure code */
250 static int seq_free_client1(struct snd_seq_client *client)
256 spin_lock_irqsave(&clients_lock, flags);
257 clienttablock[client->number] = 1;
258 clienttab[client->number] = NULL;
259 spin_unlock_irqrestore(&clients_lock, flags);
260 snd_seq_delete_all_ports(client);
261 snd_seq_queue_client_leave(client->number);
262 snd_use_lock_sync(&client->use_lock);
263 snd_seq_queue_client_termination(client->number);
265 snd_seq_pool_delete(&client->pool);
266 spin_lock_irqsave(&clients_lock, flags);
267 clienttablock[client->number] = 0;
268 spin_unlock_irqrestore(&clients_lock, flags);
273 static void seq_free_client(struct snd_seq_client * client)
275 mutex_lock(®ister_mutex);
276 switch (client->type) {
278 pr_warn("ALSA: seq: Trying to free unused client %d\n",
283 seq_free_client1(client);
284 usage_free(&client_usage, 1);
288 pr_err("ALSA: seq: Trying to free client %d with undefined type = %d\n",
289 client->number, client->type);
291 mutex_unlock(®ister_mutex);
293 snd_seq_system_client_ev_client_exit(client->number);
298 /* -------------------------------------------------------- */
300 /* create a user client */
301 static int snd_seq_open(struct inode *inode, struct file *file)
303 int c, mode; /* client id */
304 struct snd_seq_client *client;
305 struct snd_seq_user_client *user;
308 err = nonseekable_open(inode, file);
312 if (mutex_lock_interruptible(®ister_mutex))
314 client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS);
315 if (client == NULL) {
316 mutex_unlock(®ister_mutex);
317 return -ENOMEM; /* failure code */
320 mode = snd_seq_file_flags(file);
321 if (mode & SNDRV_SEQ_LFLG_INPUT)
322 client->accept_input = 1;
323 if (mode & SNDRV_SEQ_LFLG_OUTPUT)
324 client->accept_output = 1;
326 user = &client->data.user;
328 user->fifo_pool_size = 0;
330 if (mode & SNDRV_SEQ_LFLG_INPUT) {
331 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS;
332 user->fifo = snd_seq_fifo_new(user->fifo_pool_size);
333 if (user->fifo == NULL) {
334 seq_free_client1(client);
336 mutex_unlock(®ister_mutex);
341 usage_alloc(&client_usage, 1);
342 client->type = USER_CLIENT;
343 mutex_unlock(®ister_mutex);
346 file->private_data = client;
348 /* fill client data */
350 sprintf(client->name, "Client-%d", c);
351 client->data.user.owner = get_pid(task_pid(current));
353 /* make others aware this new client */
354 snd_seq_system_client_ev_client_start(c);
359 /* delete a user client */
360 static int snd_seq_release(struct inode *inode, struct file *file)
362 struct snd_seq_client *client = file->private_data;
365 seq_free_client(client);
366 if (client->data.user.fifo)
367 snd_seq_fifo_delete(&client->data.user.fifo);
368 put_pid(client->data.user.owner);
376 /* handle client read() */
377 /* possible error values:
378 * -ENXIO invalid client or file open mode
379 * -ENOSPC FIFO overflow (the flag is cleared after this error report)
380 * -EINVAL no enough user-space buffer to write the whole event
381 * -EFAULT seg. fault during copy to user space
383 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count,
386 struct snd_seq_client *client = file->private_data;
387 struct snd_seq_fifo *fifo;
390 struct snd_seq_event_cell *cell;
392 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT))
395 if (!access_ok(VERIFY_WRITE, buf, count))
398 /* check client structures are in place */
399 if (snd_BUG_ON(!client))
402 if (!client->accept_input || (fifo = client->data.user.fifo) == NULL)
405 if (atomic_read(&fifo->overflow) > 0) {
406 /* buffer overflow is detected */
407 snd_seq_fifo_clear(fifo);
408 /* return error code */
414 snd_seq_fifo_lock(fifo);
416 /* while data available in queue */
417 while (count >= sizeof(struct snd_seq_event)) {
420 nonblock = (file->f_flags & O_NONBLOCK) || result > 0;
421 if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) {
424 if (snd_seq_ev_is_variable(&cell->event)) {
425 struct snd_seq_event tmpev;
427 tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
428 if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) {
432 count -= sizeof(struct snd_seq_event);
433 buf += sizeof(struct snd_seq_event);
434 err = snd_seq_expand_var_event(&cell->event, count,
435 (char __force *)buf, 0,
436 sizeof(struct snd_seq_event));
443 if (copy_to_user(buf, &cell->event, sizeof(struct snd_seq_event))) {
447 count -= sizeof(struct snd_seq_event);
448 buf += sizeof(struct snd_seq_event);
450 snd_seq_cell_free(cell);
451 cell = NULL; /* to be sure */
452 result += sizeof(struct snd_seq_event);
457 snd_seq_fifo_cell_putback(fifo, cell);
458 if (err == -EAGAIN && result > 0)
461 snd_seq_fifo_unlock(fifo);
463 return (err < 0) ? err : result;
468 * check access permission to the port
470 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags)
472 if ((port->capability & flags) != flags)
478 * check if the destination client is available, and return the pointer
479 * if filter is non-zero, client filter bitmap is tested.
481 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event,
484 struct snd_seq_client *dest;
486 dest = snd_seq_client_use_ptr(event->dest.client);
489 if (! dest->accept_input)
491 if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) &&
492 ! test_bit(event->type, dest->event_filter))
494 if (filter && !(dest->filter & filter))
497 return dest; /* ok - accessible */
499 snd_seq_client_unlock(dest);
505 * Return the error event.
507 * If the receiver client is a user client, the original event is
508 * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event. If
509 * the original event is also variable length, the external data is
510 * copied after the event record.
511 * If the receiver client is a kernel client, the original event is
512 * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra
515 static int bounce_error_event(struct snd_seq_client *client,
516 struct snd_seq_event *event,
517 int err, int atomic, int hop)
519 struct snd_seq_event bounce_ev;
522 if (client == NULL ||
523 ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) ||
524 ! client->accept_input)
525 return 0; /* ignored */
527 /* set up quoted error */
528 memset(&bounce_ev, 0, sizeof(bounce_ev));
529 bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR;
530 bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED;
531 bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT;
532 bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
533 bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
534 bounce_ev.dest.client = client->number;
535 bounce_ev.dest.port = event->source.port;
536 bounce_ev.data.quote.origin = event->dest;
537 bounce_ev.data.quote.event = event;
538 bounce_ev.data.quote.value = -err; /* use positive value */
539 result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1);
541 client->event_lost++;
550 * rewrite the time-stamp of the event record with the curren time
551 * of the given queue.
552 * return non-zero if updated.
554 static int update_timestamp_of_queue(struct snd_seq_event *event,
555 int queue, int real_time)
557 struct snd_seq_queue *q;
562 event->queue = queue;
563 event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK;
565 event->time.time = snd_seq_timer_get_cur_time(q->timer, true);
566 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL;
568 event->time.tick = snd_seq_timer_get_cur_tick(q->timer);
569 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK;
577 * deliver an event to the specified destination.
578 * if filter is non-zero, client filter bitmap is tested.
580 * RETURN VALUE: 0 : if succeeded
583 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
584 struct snd_seq_event *event,
585 int filter, int atomic, int hop)
587 struct snd_seq_client *dest = NULL;
588 struct snd_seq_client_port *dest_port = NULL;
589 int result = -ENOENT;
592 direct = snd_seq_ev_is_direct(event);
594 dest = get_event_dest_client(event, filter);
597 dest_port = snd_seq_port_use_ptr(dest, event->dest.port);
598 if (dest_port == NULL)
601 /* check permission */
602 if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) {
607 if (dest_port->timestamping)
608 update_timestamp_of_queue(event, dest_port->time_queue,
609 dest_port->time_real);
611 switch (dest->type) {
613 if (dest->data.user.fifo)
614 result = snd_seq_fifo_event_in(dest->data.user.fifo, event);
618 if (dest_port->event_input == NULL)
620 result = dest_port->event_input(event, direct,
621 dest_port->private_data,
630 snd_seq_port_unlock(dest_port);
632 snd_seq_client_unlock(dest);
634 if (result < 0 && !direct) {
635 result = bounce_error_event(client, event, result, atomic, hop);
642 * send the event to all subscribers:
644 static int deliver_to_subscribers(struct snd_seq_client *client,
645 struct snd_seq_event *event,
648 struct snd_seq_subscribers *subs;
649 int err, result = 0, num_ev = 0;
650 struct snd_seq_event event_saved;
651 struct snd_seq_client_port *src_port;
652 struct snd_seq_port_subs_info *grp;
654 src_port = snd_seq_port_use_ptr(client, event->source.port);
655 if (src_port == NULL)
656 return -EINVAL; /* invalid source port */
657 /* save original event record */
658 event_saved = *event;
659 grp = &src_port->c_src;
663 read_lock(&grp->list_lock);
665 down_read_nested(&grp->list_mutex, hop);
666 list_for_each_entry(subs, &grp->list_head, src_list) {
667 /* both ports ready? */
668 if (atomic_read(&subs->ref_count) != 2)
670 event->dest = subs->info.dest;
671 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
672 /* convert time according to flag with subscription */
673 update_timestamp_of_queue(event, subs->info.queue,
674 subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL);
675 err = snd_seq_deliver_single_event(client, event,
678 /* save first error that occurs and continue */
684 /* restore original event record */
685 *event = event_saved;
688 read_unlock(&grp->list_lock);
690 up_read(&grp->list_mutex);
691 *event = event_saved; /* restore */
692 snd_seq_port_unlock(src_port);
693 return (result < 0) ? result : num_ev;
697 #ifdef SUPPORT_BROADCAST
699 * broadcast to all ports:
701 static int port_broadcast_event(struct snd_seq_client *client,
702 struct snd_seq_event *event,
705 int num_ev = 0, err, result = 0;
706 struct snd_seq_client *dest_client;
707 struct snd_seq_client_port *port;
709 dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST);
710 if (dest_client == NULL)
711 return 0; /* no matching destination */
713 read_lock(&dest_client->ports_lock);
714 list_for_each_entry(port, &dest_client->ports_list_head, list) {
715 event->dest.port = port->addr.port;
716 /* pass NULL as source client to avoid error bounce */
717 err = snd_seq_deliver_single_event(NULL, event,
718 SNDRV_SEQ_FILTER_BROADCAST,
721 /* save first error that occurs and continue */
728 read_unlock(&dest_client->ports_lock);
729 snd_seq_client_unlock(dest_client);
730 event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */
731 return (result < 0) ? result : num_ev;
735 * send the event to all clients:
736 * if destination port is also ADDRESS_BROADCAST, deliver to all ports.
738 static int broadcast_event(struct snd_seq_client *client,
739 struct snd_seq_event *event, int atomic, int hop)
741 int err, result = 0, num_ev = 0;
743 struct snd_seq_addr addr;
745 addr = event->dest; /* save */
747 for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) {
748 /* don't send to itself */
749 if (dest == client->number)
751 event->dest.client = dest;
752 event->dest.port = addr.port;
753 if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST)
754 err = port_broadcast_event(client, event, atomic, hop);
756 /* pass NULL as source client to avoid error bounce */
757 err = snd_seq_deliver_single_event(NULL, event,
758 SNDRV_SEQ_FILTER_BROADCAST,
761 /* save first error that occurs and continue */
768 event->dest = addr; /* restore */
769 return (result < 0) ? result : num_ev;
773 /* multicast - not supported yet */
774 static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event,
777 pr_debug("ALSA: seq: multicast not supported yet.\n");
778 return 0; /* ignored */
780 #endif /* SUPPORT_BROADCAST */
783 /* deliver an event to the destination port(s).
784 * if the event is to subscribers or broadcast, the event is dispatched
785 * to multiple targets.
787 * RETURN VALUE: n > 0 : the number of delivered events.
788 * n == 0 : the event was not passed to any client.
789 * n < 0 : error - event was not processed.
791 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event,
797 if (hop >= SNDRV_SEQ_MAX_HOPS) {
798 pr_debug("ALSA: seq: too long delivery path (%d:%d->%d:%d)\n",
799 event->source.client, event->source.port,
800 event->dest.client, event->dest.port);
804 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS ||
805 event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS)
806 result = deliver_to_subscribers(client, event, atomic, hop);
807 #ifdef SUPPORT_BROADCAST
808 else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST ||
809 event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST)
810 result = broadcast_event(client, event, atomic, hop);
811 else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS)
812 result = multicast_event(client, event, atomic, hop);
813 else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST)
814 result = port_broadcast_event(client, event, atomic, hop);
817 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop);
823 * dispatch an event cell:
824 * This function is called only from queue check routines in timer
825 * interrupts or after enqueued.
826 * The event cell shall be released or re-queued in this function.
828 * RETURN VALUE: n > 0 : the number of delivered events.
829 * n == 0 : the event was not passed to any client.
830 * n < 0 : error - event was not processed.
832 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop)
834 struct snd_seq_client *client;
837 if (snd_BUG_ON(!cell))
840 client = snd_seq_client_use_ptr(cell->event.source.client);
841 if (client == NULL) {
842 snd_seq_cell_free(cell); /* release this cell */
846 if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) {
848 * the event cell is re-used as a NOTE-OFF event and
851 struct snd_seq_event tmpev, *ev;
853 /* reserve this event to enqueue note-off later */
855 tmpev.type = SNDRV_SEQ_EVENT_NOTEON;
856 result = snd_seq_deliver_event(client, &tmpev, atomic, hop);
859 * This was originally a note event. We now re-use the
860 * cell for the note-off event.
864 ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
865 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH;
867 /* add the duration time */
868 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) {
869 case SNDRV_SEQ_TIME_STAMP_TICK:
870 ev->time.tick += ev->data.note.duration;
872 case SNDRV_SEQ_TIME_STAMP_REAL:
873 /* unit for duration is ms */
874 ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000);
875 ev->time.time.tv_sec += ev->data.note.duration / 1000 +
876 ev->time.time.tv_nsec / 1000000000;
877 ev->time.time.tv_nsec %= 1000000000;
880 ev->data.note.velocity = ev->data.note.off_velocity;
882 /* Now queue this cell as the note off event */
883 if (snd_seq_enqueue_event(cell, atomic, hop) < 0)
884 snd_seq_cell_free(cell); /* release this cell */
888 * event cell is freed after processing the event
891 result = snd_seq_deliver_event(client, &cell->event, atomic, hop);
892 snd_seq_cell_free(cell);
895 snd_seq_client_unlock(client);
900 /* Allocate a cell from client pool and enqueue it to queue:
901 * if pool is empty and blocking is TRUE, sleep until a new cell is
904 static int snd_seq_client_enqueue_event(struct snd_seq_client *client,
905 struct snd_seq_event *event,
906 struct file *file, int blocking,
908 struct mutex *mutexp)
910 struct snd_seq_event_cell *cell;
913 /* special queue values - force direct passing */
914 if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
915 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
916 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
918 #ifdef SUPPORT_BROADCAST
919 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) {
920 event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST;
921 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
924 if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
925 /* check presence of source port */
926 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port);
927 if (src_port == NULL)
929 snd_seq_port_unlock(src_port);
932 /* direct event processing without enqueued */
933 if (snd_seq_ev_is_direct(event)) {
934 if (event->type == SNDRV_SEQ_EVENT_NOTE)
935 return -EINVAL; /* this event must be enqueued! */
936 return snd_seq_deliver_event(client, event, atomic, hop);
939 /* Not direct, normal queuing */
940 if (snd_seq_queue_is_used(event->queue, client->number) <= 0)
941 return -EINVAL; /* invalid queue */
942 if (! snd_seq_write_pool_allocated(client))
943 return -ENXIO; /* queue is not allocated */
945 /* allocate an event cell */
946 err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic,
951 /* we got a cell. enqueue it. */
952 if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
953 snd_seq_cell_free(cell);
962 * check validity of event type and data length.
963 * return non-zero if invalid.
965 static int check_event_type_and_length(struct snd_seq_event *ev)
967 switch (snd_seq_ev_length_type(ev)) {
968 case SNDRV_SEQ_EVENT_LENGTH_FIXED:
969 if (snd_seq_ev_is_variable_type(ev))
972 case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
973 if (! snd_seq_ev_is_variable_type(ev) ||
974 (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
977 case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
978 if (! snd_seq_ev_is_direct(ev))
987 /* possible error values:
988 * -ENXIO invalid client or file open mode
989 * -ENOMEM malloc failed
990 * -EFAULT seg. fault during copy from user space
991 * -EINVAL invalid event
992 * -EAGAIN no space in output pool
993 * -EINTR interrupts while sleep
994 * -EMLINK too many hops
995 * others depends on return value from driver callback
997 static ssize_t snd_seq_write(struct file *file, const char __user *buf,
998 size_t count, loff_t *offset)
1000 struct snd_seq_client *client = file->private_data;
1001 int written = 0, len;
1003 struct snd_seq_event event;
1005 if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
1008 /* check client structures are in place */
1009 if (snd_BUG_ON(!client))
1012 if (!client->accept_output || client->pool == NULL)
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);
1079 /* Update pointers and counts */
1084 /* let's have a coffee break if too many events are queued */
1085 if (++handled >= 200) {
1086 mutex_unlock(&client->ioctl_mutex);
1092 mutex_unlock(&client->ioctl_mutex);
1093 return written ? written : err;
1100 static unsigned int snd_seq_poll(struct file *file, poll_table * wait)
1102 struct snd_seq_client *client = file->private_data;
1103 unsigned int mask = 0;
1105 /* check client structures are in place */
1106 if (snd_BUG_ON(!client))
1109 if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1110 client->data.user.fifo) {
1112 /* check if data is available in the outqueue */
1113 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
1114 mask |= POLLIN | POLLRDNORM;
1117 if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1119 /* check if data is available in the pool */
1120 if (!snd_seq_write_pool_allocated(client) ||
1121 snd_seq_pool_poll_wait(client->pool, file, wait))
1122 mask |= POLLOUT | POLLWRNORM;
1129 /*-----------------------------------------------------*/
1131 static int snd_seq_ioctl_pversion(struct snd_seq_client *client, void *arg)
1133 int *pversion = arg;
1135 *pversion = SNDRV_SEQ_VERSION;
1139 static int snd_seq_ioctl_client_id(struct snd_seq_client *client, void *arg)
1141 int *client_id = arg;
1143 *client_id = client->number;
1147 /* SYSTEM_INFO ioctl() */
1148 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void *arg)
1150 struct snd_seq_system_info *info = arg;
1152 memset(info, 0, sizeof(*info));
1153 /* fill the info fields */
1154 info->queues = SNDRV_SEQ_MAX_QUEUES;
1155 info->clients = SNDRV_SEQ_MAX_CLIENTS;
1156 info->ports = SNDRV_SEQ_MAX_PORTS;
1157 info->channels = 256; /* fixed limit */
1158 info->cur_clients = client_usage.cur;
1159 info->cur_queues = snd_seq_queue_get_cur_queues();
1165 /* RUNNING_MODE ioctl() */
1166 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void *arg)
1168 struct snd_seq_running_info *info = arg;
1169 struct snd_seq_client *cptr;
1172 /* requested client number */
1173 cptr = snd_seq_client_use_ptr(info->client);
1175 return -ENOENT; /* don't change !!! */
1177 #ifdef SNDRV_BIG_ENDIAN
1178 if (!info->big_endian) {
1183 if (info->big_endian) {
1189 if (info->cpu_mode > sizeof(long)) {
1193 cptr->convert32 = (info->cpu_mode < sizeof(long));
1195 snd_seq_client_unlock(cptr);
1199 /* CLIENT_INFO ioctl() */
1200 static void get_client_info(struct snd_seq_client *cptr,
1201 struct snd_seq_client_info *info)
1203 info->client = cptr->number;
1205 /* fill the info fields */
1206 info->type = cptr->type;
1207 strcpy(info->name, cptr->name);
1208 info->filter = cptr->filter;
1209 info->event_lost = cptr->event_lost;
1210 memcpy(info->event_filter, cptr->event_filter, 32);
1211 info->num_ports = cptr->num_ports;
1213 if (cptr->type == USER_CLIENT)
1214 info->pid = pid_vnr(cptr->data.user.owner);
1218 if (cptr->type == KERNEL_CLIENT)
1219 info->card = cptr->data.kernel.card ? cptr->data.kernel.card->number : -1;
1223 memset(info->reserved, 0, sizeof(info->reserved));
1226 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
1229 struct snd_seq_client_info *client_info = arg;
1230 struct snd_seq_client *cptr;
1232 /* requested client number */
1233 cptr = snd_seq_client_use_ptr(client_info->client);
1235 return -ENOENT; /* don't change !!! */
1237 get_client_info(cptr, client_info);
1238 snd_seq_client_unlock(cptr);
1244 /* CLIENT_INFO ioctl() */
1245 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
1248 struct snd_seq_client_info *client_info = arg;
1250 /* it is not allowed to set the info fields for an another client */
1251 if (client->number != client_info->client)
1253 /* also client type must be set now */
1254 if (client->type != client_info->type)
1257 /* fill the info fields */
1258 if (client_info->name[0])
1259 strscpy(client->name, client_info->name, sizeof(client->name));
1261 client->filter = client_info->filter;
1262 client->event_lost = client_info->event_lost;
1263 memcpy(client->event_filter, client_info->event_filter, 32);
1270 * CREATE PORT ioctl()
1272 static int snd_seq_ioctl_create_port(struct snd_seq_client *client, void *arg)
1274 struct snd_seq_port_info *info = arg;
1275 struct snd_seq_client_port *port;
1276 struct snd_seq_port_callback *callback;
1279 /* it is not allowed to create the port for an another client */
1280 if (info->addr.client != client->number)
1283 port = snd_seq_create_port(client, (info->flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info->addr.port : -1);
1287 if (client->type == USER_CLIENT && info->kernel) {
1288 port_idx = port->addr.port;
1289 snd_seq_port_unlock(port);
1290 snd_seq_delete_port(client, port_idx);
1293 if (client->type == KERNEL_CLIENT) {
1294 if ((callback = info->kernel) != NULL) {
1295 if (callback->owner)
1296 port->owner = callback->owner;
1297 port->private_data = callback->private_data;
1298 port->private_free = callback->private_free;
1299 port->event_input = callback->event_input;
1300 port->c_src.open = callback->subscribe;
1301 port->c_src.close = callback->unsubscribe;
1302 port->c_dest.open = callback->use;
1303 port->c_dest.close = callback->unuse;
1307 info->addr = port->addr;
1309 snd_seq_set_port_info(port, info);
1310 snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1311 snd_seq_port_unlock(port);
1317 * DELETE PORT ioctl()
1319 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client, void *arg)
1321 struct snd_seq_port_info *info = arg;
1324 /* it is not allowed to remove the port for an another client */
1325 if (info->addr.client != client->number)
1328 err = snd_seq_delete_port(client, info->addr.port);
1330 snd_seq_system_client_ev_port_exit(client->number, info->addr.port);
1336 * GET_PORT_INFO ioctl() (on any client)
1338 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client, void *arg)
1340 struct snd_seq_port_info *info = arg;
1341 struct snd_seq_client *cptr;
1342 struct snd_seq_client_port *port;
1344 cptr = snd_seq_client_use_ptr(info->addr.client);
1348 port = snd_seq_port_use_ptr(cptr, info->addr.port);
1350 snd_seq_client_unlock(cptr);
1351 return -ENOENT; /* don't change */
1355 snd_seq_get_port_info(port, info);
1356 snd_seq_port_unlock(port);
1357 snd_seq_client_unlock(cptr);
1364 * SET_PORT_INFO ioctl() (only ports on this/own client)
1366 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client, void *arg)
1368 struct snd_seq_port_info *info = arg;
1369 struct snd_seq_client_port *port;
1371 if (info->addr.client != client->number) /* only set our own ports ! */
1373 port = snd_seq_port_use_ptr(client, info->addr.port);
1375 snd_seq_set_port_info(port, info);
1376 snd_seq_port_unlock(port);
1383 * port subscription (connection)
1385 #define PERM_RD (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1386 #define PERM_WR (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1388 static int check_subscription_permission(struct snd_seq_client *client,
1389 struct snd_seq_client_port *sport,
1390 struct snd_seq_client_port *dport,
1391 struct snd_seq_port_subscribe *subs)
1393 if (client->number != subs->sender.client &&
1394 client->number != subs->dest.client) {
1395 /* connection by third client - check export permission */
1396 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1398 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1402 /* check read permission */
1403 /* if sender or receiver is the subscribing client itself,
1404 * no permission check is necessary
1406 if (client->number != subs->sender.client) {
1407 if (! check_port_perm(sport, PERM_RD))
1410 /* check write permission */
1411 if (client->number != subs->dest.client) {
1412 if (! check_port_perm(dport, PERM_WR))
1419 * send an subscription notify event to user client:
1420 * client must be user client.
1422 int snd_seq_client_notify_subscription(int client, int port,
1423 struct snd_seq_port_subscribe *info,
1426 struct snd_seq_event event;
1428 memset(&event, 0, sizeof(event));
1429 event.type = evtype;
1430 event.data.connect.dest = info->dest;
1431 event.data.connect.sender = info->sender;
1433 return snd_seq_system_notify(client, port, &event); /* non-atomic */
1438 * add to port's subscription list IOCTL interface
1440 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
1443 struct snd_seq_port_subscribe *subs = arg;
1444 int result = -EINVAL;
1445 struct snd_seq_client *receiver = NULL, *sender = NULL;
1446 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1448 if ((receiver = snd_seq_client_use_ptr(subs->dest.client)) == NULL)
1450 if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1452 if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1454 if ((dport = snd_seq_port_use_ptr(receiver, subs->dest.port)) == NULL)
1457 result = check_subscription_permission(client, sport, dport, subs);
1462 result = snd_seq_port_connect(client, sender, sport, receiver, dport, subs);
1463 if (! result) /* broadcast announce */
1464 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1465 subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1468 snd_seq_port_unlock(sport);
1470 snd_seq_port_unlock(dport);
1472 snd_seq_client_unlock(sender);
1474 snd_seq_client_unlock(receiver);
1480 * remove from port's subscription list
1482 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
1485 struct snd_seq_port_subscribe *subs = arg;
1486 int result = -ENXIO;
1487 struct snd_seq_client *receiver = NULL, *sender = NULL;
1488 struct snd_seq_client_port *sport = NULL, *dport = NULL;
1490 if ((receiver = snd_seq_client_use_ptr(subs->dest.client)) == NULL)
1492 if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1494 if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1496 if ((dport = snd_seq_port_use_ptr(receiver, subs->dest.port)) == NULL)
1499 result = check_subscription_permission(client, sport, dport, subs);
1503 result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, subs);
1504 if (! result) /* broadcast announce */
1505 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1506 subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1509 snd_seq_port_unlock(sport);
1511 snd_seq_port_unlock(dport);
1513 snd_seq_client_unlock(sender);
1515 snd_seq_client_unlock(receiver);
1520 /* CREATE_QUEUE ioctl() */
1521 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client, void *arg)
1523 struct snd_seq_queue_info *info = arg;
1524 struct snd_seq_queue *q;
1526 q = snd_seq_queue_alloc(client->number, info->locked, info->flags);
1530 info->queue = q->queue;
1531 info->locked = q->locked;
1532 info->owner = q->owner;
1534 /* set queue name */
1536 snprintf(info->name, sizeof(info->name), "Queue-%d", q->queue);
1537 strscpy(q->name, info->name, sizeof(q->name));
1538 snd_use_lock_free(&q->use_lock);
1543 /* DELETE_QUEUE ioctl() */
1544 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client, void *arg)
1546 struct snd_seq_queue_info *info = arg;
1548 return snd_seq_queue_delete(client->number, info->queue);
1551 /* GET_QUEUE_INFO ioctl() */
1552 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client,
1555 struct snd_seq_queue_info *info = arg;
1556 struct snd_seq_queue *q;
1558 q = queueptr(info->queue);
1562 memset(info, 0, sizeof(*info));
1563 info->queue = q->queue;
1564 info->owner = q->owner;
1565 info->locked = q->locked;
1566 strlcpy(info->name, q->name, sizeof(info->name));
1572 /* SET_QUEUE_INFO ioctl() */
1573 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
1576 struct snd_seq_queue_info *info = arg;
1577 struct snd_seq_queue *q;
1579 if (info->owner != client->number)
1582 /* change owner/locked permission */
1583 if (snd_seq_queue_check_access(info->queue, client->number)) {
1584 if (snd_seq_queue_set_owner(info->queue, client->number, info->locked) < 0)
1587 snd_seq_queue_use(info->queue, client->number, 1);
1592 q = queueptr(info->queue);
1595 if (q->owner != client->number) {
1599 strscpy(q->name, info->name, sizeof(q->name));
1605 /* GET_NAMED_QUEUE ioctl() */
1606 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client,
1609 struct snd_seq_queue_info *info = arg;
1610 struct snd_seq_queue *q;
1612 q = snd_seq_queue_find_name(info->name);
1615 info->queue = q->queue;
1616 info->owner = q->owner;
1617 info->locked = q->locked;
1623 /* GET_QUEUE_STATUS ioctl() */
1624 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
1627 struct snd_seq_queue_status *status = arg;
1628 struct snd_seq_queue *queue;
1629 struct snd_seq_timer *tmr;
1631 queue = queueptr(status->queue);
1634 memset(status, 0, sizeof(*status));
1635 status->queue = queue->queue;
1638 status->events = queue->tickq->cells + queue->timeq->cells;
1640 status->time = snd_seq_timer_get_cur_time(tmr, true);
1641 status->tick = snd_seq_timer_get_cur_tick(tmr);
1643 status->running = tmr->running;
1645 status->flags = queue->flags;
1652 /* GET_QUEUE_TEMPO ioctl() */
1653 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
1656 struct snd_seq_queue_tempo *tempo = arg;
1657 struct snd_seq_queue *queue;
1658 struct snd_seq_timer *tmr;
1660 queue = queueptr(tempo->queue);
1663 memset(tempo, 0, sizeof(*tempo));
1664 tempo->queue = queue->queue;
1668 tempo->tempo = tmr->tempo;
1669 tempo->ppq = tmr->ppq;
1670 tempo->skew_value = tmr->skew;
1671 tempo->skew_base = tmr->skew_base;
1678 /* SET_QUEUE_TEMPO ioctl() */
1679 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1681 if (!snd_seq_queue_check_access(tempo->queue, client))
1683 return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1686 EXPORT_SYMBOL(snd_seq_set_queue_tempo);
1688 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
1691 struct snd_seq_queue_tempo *tempo = arg;
1694 result = snd_seq_set_queue_tempo(client->number, tempo);
1695 return result < 0 ? result : 0;
1699 /* GET_QUEUE_TIMER ioctl() */
1700 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
1703 struct snd_seq_queue_timer *timer = arg;
1704 struct snd_seq_queue *queue;
1705 struct snd_seq_timer *tmr;
1707 queue = queueptr(timer->queue);
1711 if (mutex_lock_interruptible(&queue->timer_mutex)) {
1713 return -ERESTARTSYS;
1716 memset(timer, 0, sizeof(*timer));
1717 timer->queue = queue->queue;
1719 timer->type = tmr->type;
1720 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1721 timer->u.alsa.id = tmr->alsa_id;
1722 timer->u.alsa.resolution = tmr->preferred_resolution;
1724 mutex_unlock(&queue->timer_mutex);
1731 /* SET_QUEUE_TIMER ioctl() */
1732 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
1735 struct snd_seq_queue_timer *timer = arg;
1738 if (timer->type != SNDRV_SEQ_TIMER_ALSA)
1741 if (snd_seq_queue_check_access(timer->queue, client->number)) {
1742 struct snd_seq_queue *q;
1743 struct snd_seq_timer *tmr;
1745 q = queueptr(timer->queue);
1748 if (mutex_lock_interruptible(&q->timer_mutex)) {
1750 return -ERESTARTSYS;
1753 snd_seq_queue_timer_close(timer->queue);
1754 tmr->type = timer->type;
1755 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1756 tmr->alsa_id = timer->u.alsa.id;
1757 tmr->preferred_resolution = timer->u.alsa.resolution;
1759 result = snd_seq_queue_timer_open(timer->queue);
1760 mutex_unlock(&q->timer_mutex);
1770 /* GET_QUEUE_CLIENT ioctl() */
1771 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
1774 struct snd_seq_queue_client *info = arg;
1777 used = snd_seq_queue_is_used(info->queue, client->number);
1781 info->client = client->number;
1787 /* SET_QUEUE_CLIENT ioctl() */
1788 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
1791 struct snd_seq_queue_client *info = arg;
1794 if (info->used >= 0) {
1795 err = snd_seq_queue_use(info->queue, client->number, info->used);
1800 return snd_seq_ioctl_get_queue_client(client, arg);
1804 /* GET_CLIENT_POOL ioctl() */
1805 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
1808 struct snd_seq_client_pool *info = arg;
1809 struct snd_seq_client *cptr;
1811 cptr = snd_seq_client_use_ptr(info->client);
1814 memset(info, 0, sizeof(*info));
1815 info->client = cptr->number;
1816 info->output_pool = cptr->pool->size;
1817 info->output_room = cptr->pool->room;
1818 info->output_free = info->output_pool;
1819 info->output_free = snd_seq_unused_cells(cptr->pool);
1820 if (cptr->type == USER_CLIENT) {
1821 info->input_pool = cptr->data.user.fifo_pool_size;
1822 info->input_free = info->input_pool;
1823 info->input_free = snd_seq_fifo_unused_cells(cptr->data.user.fifo);
1825 info->input_pool = 0;
1826 info->input_free = 0;
1828 snd_seq_client_unlock(cptr);
1833 /* SET_CLIENT_POOL ioctl() */
1834 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
1837 struct snd_seq_client_pool *info = arg;
1840 if (client->number != info->client)
1841 return -EINVAL; /* can't change other clients */
1843 if (info->output_pool >= 1 && info->output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1844 (! snd_seq_write_pool_allocated(client) ||
1845 info->output_pool != client->pool->size)) {
1846 if (snd_seq_write_pool_allocated(client)) {
1847 /* is the pool in use? */
1848 if (atomic_read(&client->pool->counter))
1850 /* remove all existing cells */
1851 snd_seq_pool_mark_closing(client->pool);
1852 snd_seq_queue_client_leave_cells(client->number);
1853 snd_seq_pool_done(client->pool);
1855 client->pool->size = info->output_pool;
1856 rc = snd_seq_pool_init(client->pool);
1860 if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
1861 info->input_pool >= 1 &&
1862 info->input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1863 info->input_pool != client->data.user.fifo_pool_size) {
1864 /* change pool size */
1865 rc = snd_seq_fifo_resize(client->data.user.fifo, info->input_pool);
1868 client->data.user.fifo_pool_size = info->input_pool;
1870 if (info->output_room >= 1 &&
1871 info->output_room <= client->pool->size) {
1872 client->pool->room = info->output_room;
1875 return snd_seq_ioctl_get_client_pool(client, arg);
1879 /* REMOVE_EVENTS ioctl() */
1880 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
1883 struct snd_seq_remove_events *info = arg;
1886 * Input mostly not implemented XXX.
1888 if (info->remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1890 * No restrictions so for a user client we can clear
1893 if (client->type == USER_CLIENT && client->data.user.fifo)
1894 snd_seq_fifo_clear(client->data.user.fifo);
1897 if (info->remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1898 snd_seq_queue_remove_cells(client->number, info);
1905 * get subscription info
1907 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
1910 struct snd_seq_port_subscribe *subs = arg;
1912 struct snd_seq_client *sender = NULL;
1913 struct snd_seq_client_port *sport = NULL;
1916 if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1918 if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1920 result = snd_seq_port_get_subscription(&sport->c_src, &subs->dest,
1924 snd_seq_port_unlock(sport);
1926 snd_seq_client_unlock(sender);
1933 * get subscription info - check only its presence
1935 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client, void *arg)
1937 struct snd_seq_query_subs *subs = arg;
1938 int result = -ENXIO;
1939 struct snd_seq_client *cptr = NULL;
1940 struct snd_seq_client_port *port = NULL;
1941 struct snd_seq_port_subs_info *group;
1942 struct list_head *p;
1945 if ((cptr = snd_seq_client_use_ptr(subs->root.client)) == NULL)
1947 if ((port = snd_seq_port_use_ptr(cptr, subs->root.port)) == NULL)
1950 switch (subs->type) {
1951 case SNDRV_SEQ_QUERY_SUBS_READ:
1952 group = &port->c_src;
1954 case SNDRV_SEQ_QUERY_SUBS_WRITE:
1955 group = &port->c_dest;
1961 down_read(&group->list_mutex);
1962 /* search for the subscriber */
1963 subs->num_subs = group->count;
1966 list_for_each(p, &group->list_head) {
1967 if (i++ == subs->index) {
1969 struct snd_seq_subscribers *s;
1970 if (subs->type == SNDRV_SEQ_QUERY_SUBS_READ) {
1971 s = list_entry(p, struct snd_seq_subscribers, src_list);
1972 subs->addr = s->info.dest;
1974 s = list_entry(p, struct snd_seq_subscribers, dest_list);
1975 subs->addr = s->info.sender;
1977 subs->flags = s->info.flags;
1978 subs->queue = s->info.queue;
1983 up_read(&group->list_mutex);
1987 snd_seq_port_unlock(port);
1989 snd_seq_client_unlock(cptr);
1998 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
2001 struct snd_seq_client_info *info = arg;
2002 struct snd_seq_client *cptr = NULL;
2004 /* search for next client */
2005 if (info->client < INT_MAX)
2007 if (info->client < 0)
2009 for (; info->client < SNDRV_SEQ_MAX_CLIENTS; info->client++) {
2010 cptr = snd_seq_client_use_ptr(info->client);
2017 get_client_info(cptr, info);
2018 snd_seq_client_unlock(cptr);
2026 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
2029 struct snd_seq_port_info *info = arg;
2030 struct snd_seq_client *cptr;
2031 struct snd_seq_client_port *port = NULL;
2033 cptr = snd_seq_client_use_ptr(info->addr.client);
2037 /* search for next port */
2039 port = snd_seq_port_query_nearest(cptr, info);
2041 snd_seq_client_unlock(cptr);
2046 info->addr = port->addr;
2047 snd_seq_get_port_info(port, info);
2048 snd_seq_port_unlock(port);
2049 snd_seq_client_unlock(cptr);
2054 /* -------------------------------------------------------- */
2056 static const struct ioctl_handler {
2058 int (*func)(struct snd_seq_client *client, void *arg);
2059 } ioctl_handlers[] = {
2060 { SNDRV_SEQ_IOCTL_PVERSION, snd_seq_ioctl_pversion },
2061 { SNDRV_SEQ_IOCTL_CLIENT_ID, snd_seq_ioctl_client_id },
2062 { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2063 { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2064 { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2065 { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2066 { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2067 { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2068 { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2069 { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2070 { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2071 { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2072 { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2073 { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2074 { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2075 { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2076 { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2077 { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2078 { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2079 { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2080 { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2081 { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2082 { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2083 { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2084 { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2085 { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2086 { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2087 { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2088 { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2089 { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2090 { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2094 static long snd_seq_ioctl(struct file *file, unsigned int cmd,
2097 struct snd_seq_client *client = file->private_data;
2098 /* To use kernel stack for ioctl data. */
2102 struct snd_seq_system_info system_info;
2103 struct snd_seq_running_info running_info;
2104 struct snd_seq_client_info client_info;
2105 struct snd_seq_port_info port_info;
2106 struct snd_seq_port_subscribe port_subscribe;
2107 struct snd_seq_queue_info queue_info;
2108 struct snd_seq_queue_status queue_status;
2109 struct snd_seq_queue_tempo tempo;
2110 struct snd_seq_queue_timer queue_timer;
2111 struct snd_seq_queue_client queue_client;
2112 struct snd_seq_client_pool client_pool;
2113 struct snd_seq_remove_events remove_events;
2114 struct snd_seq_query_subs query_subs;
2116 const struct ioctl_handler *handler;
2120 if (snd_BUG_ON(!client))
2123 for (handler = ioctl_handlers; handler->cmd > 0; ++handler) {
2124 if (handler->cmd == cmd)
2127 if (handler->cmd == 0)
2130 memset(&buf, 0, sizeof(buf));
2133 * All of ioctl commands for ALSA sequencer get an argument of size
2134 * within 13 bits. We can safely pick up the size from the command.
2136 size = _IOC_SIZE(handler->cmd);
2137 if (handler->cmd & IOC_IN) {
2138 if (copy_from_user(&buf, (const void __user *)arg, size))
2142 mutex_lock(&client->ioctl_mutex);
2143 err = handler->func(client, &buf);
2144 mutex_unlock(&client->ioctl_mutex);
2146 /* Some commands includes a bug in 'dir' field. */
2147 if (handler->cmd == SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT ||
2148 handler->cmd == SNDRV_SEQ_IOCTL_SET_CLIENT_POOL ||
2149 (handler->cmd & IOC_OUT))
2150 if (copy_to_user((void __user *)arg, &buf, size))
2157 #ifdef CONFIG_COMPAT
2158 #include "seq_compat.c"
2160 #define snd_seq_ioctl_compat NULL
2163 /* -------------------------------------------------------- */
2166 /* exported to kernel modules */
2167 int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
2168 const char *name_fmt, ...)
2170 struct snd_seq_client *client;
2173 if (snd_BUG_ON(in_interrupt()))
2176 if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD)
2178 if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
2181 if (mutex_lock_interruptible(®ister_mutex))
2182 return -ERESTARTSYS;
2185 client_index += SNDRV_SEQ_GLOBAL_CLIENTS
2186 + card->number * SNDRV_SEQ_CLIENTS_PER_CARD;
2187 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN)
2191 /* empty write queue as default */
2192 client = seq_create_client1(client_index, 0);
2193 if (client == NULL) {
2194 mutex_unlock(®ister_mutex);
2195 return -EBUSY; /* failure code */
2197 usage_alloc(&client_usage, 1);
2199 client->accept_input = 1;
2200 client->accept_output = 1;
2201 client->data.kernel.card = card;
2203 va_start(args, name_fmt);
2204 vsnprintf(client->name, sizeof(client->name), name_fmt, args);
2207 client->type = KERNEL_CLIENT;
2208 mutex_unlock(®ister_mutex);
2210 /* make others aware this new client */
2211 snd_seq_system_client_ev_client_start(client->number);
2213 /* return client number to caller */
2214 return client->number;
2217 EXPORT_SYMBOL(snd_seq_create_kernel_client);
2219 /* exported to kernel modules */
2220 int snd_seq_delete_kernel_client(int client)
2222 struct snd_seq_client *ptr;
2224 if (snd_BUG_ON(in_interrupt()))
2227 ptr = clientptr(client);
2231 seq_free_client(ptr);
2236 EXPORT_SYMBOL(snd_seq_delete_kernel_client);
2238 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue
2239 * and snd_seq_kernel_client_enqueue_blocking
2241 static int kernel_client_enqueue(int client, struct snd_seq_event *ev,
2242 struct file *file, int blocking,
2243 int atomic, int hop)
2245 struct snd_seq_client *cptr;
2248 if (snd_BUG_ON(!ev))
2251 if (ev->type == SNDRV_SEQ_EVENT_NONE)
2252 return 0; /* ignore this */
2253 if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2254 return -EINVAL; /* quoted events can't be enqueued */
2256 /* fill in client number */
2257 ev->source.client = client;
2259 if (check_event_type_and_length(ev))
2262 cptr = snd_seq_client_use_ptr(client);
2266 if (! cptr->accept_output)
2269 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking,
2272 snd_seq_client_unlock(cptr);
2277 * exported, called by kernel clients to enqueue events (w/o blocking)
2279 * RETURN VALUE: zero if succeed, negative if error
2281 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev,
2282 int atomic, int hop)
2284 return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop);
2287 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
2290 * exported, called by kernel clients to enqueue events (with blocking)
2292 * RETURN VALUE: zero if succeed, negative if error
2294 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev,
2296 int atomic, int hop)
2298 return kernel_client_enqueue(client, ev, file, 1, atomic, hop);
2301 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking);
2304 * exported, called by kernel clients to dispatch events directly to other
2305 * clients, bypassing the queues. Event time-stamp will be updated.
2307 * RETURN VALUE: negative = delivery failed,
2308 * zero, or positive: the number of delivered events
2310 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev,
2311 int atomic, int hop)
2313 struct snd_seq_client *cptr;
2316 if (snd_BUG_ON(!ev))
2319 /* fill in client number */
2320 ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2321 ev->source.client = client;
2323 if (check_event_type_and_length(ev))
2326 cptr = snd_seq_client_use_ptr(client);
2330 if (!cptr->accept_output)
2333 result = snd_seq_deliver_event(cptr, ev, atomic, hop);
2335 snd_seq_client_unlock(cptr);
2339 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch);
2342 * snd_seq_kernel_client_ctl - operate a command for a client with data in
2344 * @clientid: A numerical ID for a client.
2345 * @cmd: An ioctl(2) command for ALSA sequencer operation.
2346 * @arg: A pointer to data in kernel space.
2348 * Against its name, both kernel/application client can be handled by this
2349 * kernel API. A pointer of 'arg' argument should be in kernel space.
2351 * Return: 0 at success. Negative error code at failure.
2353 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2355 const struct ioctl_handler *handler;
2356 struct snd_seq_client *client;
2358 client = clientptr(clientid);
2362 for (handler = ioctl_handlers; handler->cmd > 0; ++handler) {
2363 if (handler->cmd == cmd)
2364 return handler->func(client, arg);
2367 pr_debug("ALSA: seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n",
2368 cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2372 EXPORT_SYMBOL(snd_seq_kernel_client_ctl);
2374 /* exported (for OSS emulator) */
2375 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2377 struct snd_seq_client *client;
2379 client = clientptr(clientid);
2383 if (! snd_seq_write_pool_allocated(client))
2385 if (snd_seq_pool_poll_wait(client->pool, file, wait))
2390 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll);
2392 /*---------------------------------------------------------------------------*/
2394 #ifdef CONFIG_SND_PROC_FS
2398 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer,
2399 struct snd_seq_port_subs_info *group,
2400 int is_src, char *msg)
2402 struct list_head *p;
2403 struct snd_seq_subscribers *s;
2406 down_read(&group->list_mutex);
2407 if (list_empty(&group->list_head)) {
2408 up_read(&group->list_mutex);
2411 snd_iprintf(buffer, msg);
2412 list_for_each(p, &group->list_head) {
2414 s = list_entry(p, struct snd_seq_subscribers, src_list);
2416 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2418 snd_iprintf(buffer, ", ");
2419 snd_iprintf(buffer, "%d:%d",
2420 is_src ? s->info.dest.client : s->info.sender.client,
2421 is_src ? s->info.dest.port : s->info.sender.port);
2422 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
2423 snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
2424 if (group->exclusive)
2425 snd_iprintf(buffer, "[ex]");
2427 up_read(&group->list_mutex);
2428 snd_iprintf(buffer, "\n");
2431 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
2432 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
2433 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
2435 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2437 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
2438 struct snd_seq_client *client)
2440 struct snd_seq_client_port *p;
2442 mutex_lock(&client->ports_mutex);
2443 list_for_each_entry(p, &client->ports_list_head, list) {
2444 snd_iprintf(buffer, " Port %3d : \"%s\" (%c%c%c%c)\n",
2445 p->addr.port, p->name,
2446 FLAG_PERM_RD(p->capability),
2447 FLAG_PERM_WR(p->capability),
2448 FLAG_PERM_EX(p->capability),
2449 FLAG_PERM_DUPLEX(p->capability));
2450 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, " Connecting To: ");
2451 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, " Connected From: ");
2453 mutex_unlock(&client->ports_mutex);
2457 /* exported to seq_info.c */
2458 void snd_seq_info_clients_read(struct snd_info_entry *entry,
2459 struct snd_info_buffer *buffer)
2462 struct snd_seq_client *client;
2464 snd_iprintf(buffer, "Client info\n");
2465 snd_iprintf(buffer, " cur clients : %d\n", client_usage.cur);
2466 snd_iprintf(buffer, " peak clients : %d\n", client_usage.peak);
2467 snd_iprintf(buffer, " max clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
2468 snd_iprintf(buffer, "\n");
2470 /* list the client table */
2471 for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2472 client = snd_seq_client_use_ptr(c);
2475 if (client->type == NO_CLIENT) {
2476 snd_seq_client_unlock(client);
2480 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n",
2482 client->type == USER_CLIENT ? "User" : "Kernel");
2483 snd_seq_info_dump_ports(buffer, client);
2484 if (snd_seq_write_pool_allocated(client)) {
2485 snd_iprintf(buffer, " Output pool :\n");
2486 snd_seq_info_pool(buffer, client->pool, " ");
2488 if (client->type == USER_CLIENT && client->data.user.fifo &&
2489 client->data.user.fifo->pool) {
2490 snd_iprintf(buffer, " Input pool :\n");
2491 snd_seq_info_pool(buffer, client->data.user.fifo->pool, " ");
2493 snd_seq_client_unlock(client);
2496 #endif /* CONFIG_SND_PROC_FS */
2498 /*---------------------------------------------------------------------------*/
2505 static const struct file_operations snd_seq_f_ops =
2507 .owner = THIS_MODULE,
2508 .read = snd_seq_read,
2509 .write = snd_seq_write,
2510 .open = snd_seq_open,
2511 .release = snd_seq_release,
2512 .llseek = no_llseek,
2513 .poll = snd_seq_poll,
2514 .unlocked_ioctl = snd_seq_ioctl,
2515 .compat_ioctl = snd_seq_ioctl_compat,
2518 static struct device seq_dev;
2521 * register sequencer device
2523 int __init snd_sequencer_device_init(void)
2527 snd_device_initialize(&seq_dev, NULL);
2528 dev_set_name(&seq_dev, "seq");
2530 if (mutex_lock_interruptible(®ister_mutex))
2531 return -ERESTARTSYS;
2533 err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
2534 &snd_seq_f_ops, NULL, &seq_dev);
2536 mutex_unlock(®ister_mutex);
2537 put_device(&seq_dev);
2541 mutex_unlock(®ister_mutex);
2549 * unregister sequencer device
2551 void __exit snd_sequencer_device_done(void)
2553 snd_unregister_device(&seq_dev);
2554 put_device(&seq_dev);