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Linux/sound/core/seq/seq_clientmgr.c

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  1 /*
  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>
  6  *
  7  *
  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.
 12  *
 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.
 17  *
 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
 21  *
 22  */
 23 
 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>
 30 
 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"
 36 #include "seq_info.h"
 37 #include "seq_system.h"
 38 #include <sound/seq_device.h>
 39 #ifdef CONFIG_COMPAT
 40 #include <linux/compat.h>
 41 #endif
 42 
 43 /* Client Manager
 44 
 45  * this module handles the connections of userland and kernel clients
 46  * 
 47  */
 48 
 49 /*
 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
 55  */
 56 
 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
 63 
 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)
 67 
 68 static DEFINE_SPINLOCK(clients_lock);
 69 static DEFINE_MUTEX(register_mutex);
 70 
 71 /*
 72  * client table
 73  */
 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;
 77 
 78 /*
 79  * prototypes
 80  */
 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);
 87 
 88 /*
 89  */
 90  
 91 static inline mm_segment_t snd_enter_user(void)
 92 {
 93         mm_segment_t fs = get_fs();
 94         set_fs(get_ds());
 95         return fs;
 96 }
 97 
 98 static inline void snd_leave_user(mm_segment_t fs)
 99 {
100         set_fs(fs);
101 }
102 
103 /*
104  */
105 static inline unsigned short snd_seq_file_flags(struct file *file)
106 {
107         switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
108         case FMODE_WRITE:
109                 return SNDRV_SEQ_LFLG_OUTPUT;
110         case FMODE_READ:
111                 return SNDRV_SEQ_LFLG_INPUT;
112         default:
113                 return SNDRV_SEQ_LFLG_OPEN;
114         }
115 }
116 
117 static inline int snd_seq_write_pool_allocated(struct snd_seq_client *client)
118 {
119         return snd_seq_total_cells(client->pool) > 0;
120 }
121 
122 /* return pointer to client structure for specified id */
123 static struct snd_seq_client *clientptr(int clientid)
124 {
125         if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
126                 pr_debug("ALSA: seq: oops. Trying to get pointer to client %d\n",
127                            clientid);
128                 return NULL;
129         }
130         return clienttab[clientid];
131 }
132 
133 struct snd_seq_client *snd_seq_client_use_ptr(int clientid)
134 {
135         unsigned long flags;
136         struct snd_seq_client *client;
137 
138         if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
139                 pr_debug("ALSA: seq: oops. Trying to get pointer to client %d\n",
140                            clientid);
141                 return NULL;
142         }
143         spin_lock_irqsave(&clients_lock, flags);
144         client = clientptr(clientid);
145         if (client)
146                 goto __lock;
147         if (clienttablock[clientid]) {
148                 spin_unlock_irqrestore(&clients_lock, flags);
149                 return NULL;
150         }
151         spin_unlock_irqrestore(&clients_lock, flags);
152 #ifdef CONFIG_MODULES
153         if (!in_interrupt()) {
154                 static char client_requested[SNDRV_SEQ_GLOBAL_CLIENTS];
155                 static char card_requested[SNDRV_CARDS];
156                 if (clientid < SNDRV_SEQ_GLOBAL_CLIENTS) {
157                         int idx;
158                         
159                         if (!client_requested[clientid]) {
160                                 client_requested[clientid] = 1;
161                                 for (idx = 0; idx < 15; idx++) {
162                                         if (seq_client_load[idx] < 0)
163                                                 break;
164                                         if (seq_client_load[idx] == clientid) {
165                                                 request_module("snd-seq-client-%i",
166                                                                clientid);
167                                                 break;
168                                         }
169                                 }
170                         }
171                 } else if (clientid < SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) {
172                         int card = (clientid - SNDRV_SEQ_GLOBAL_CLIENTS) /
173                                 SNDRV_SEQ_CLIENTS_PER_CARD;
174                         if (card < snd_ecards_limit) {
175                                 if (! card_requested[card]) {
176                                         card_requested[card] = 1;
177                                         snd_request_card(card);
178                                 }
179                                 snd_seq_device_load_drivers();
180                         }
181                 }
182                 spin_lock_irqsave(&clients_lock, flags);
183                 client = clientptr(clientid);
184                 if (client)
185                         goto __lock;
186                 spin_unlock_irqrestore(&clients_lock, flags);
187         }
188 #endif
189         return NULL;
190 
191       __lock:
192         snd_use_lock_use(&client->use_lock);
193         spin_unlock_irqrestore(&clients_lock, flags);
194         return client;
195 }
196 
197 static void usage_alloc(struct snd_seq_usage *res, int num)
198 {
199         res->cur += num;
200         if (res->cur > res->peak)
201                 res->peak = res->cur;
202 }
203 
204 static void usage_free(struct snd_seq_usage *res, int num)
205 {
206         res->cur -= num;
207 }
208 
209 /* initialise data structures */
210 int __init client_init_data(void)
211 {
212         /* zap out the client table */
213         memset(&clienttablock, 0, sizeof(clienttablock));
214         memset(&clienttab, 0, sizeof(clienttab));
215         return 0;
216 }
217 
218 
219 static struct snd_seq_client *seq_create_client1(int client_index, int poolsize)
220 {
221         unsigned long flags;
222         int c;
223         struct snd_seq_client *client;
224 
225         /* init client data */
226         client = kzalloc(sizeof(*client), GFP_KERNEL);
227         if (client == NULL)
228                 return NULL;
229         client->pool = snd_seq_pool_new(poolsize);
230         if (client->pool == NULL) {
231                 kfree(client);
232                 return NULL;
233         }
234         client->type = NO_CLIENT;
235         snd_use_lock_init(&client->use_lock);
236         rwlock_init(&client->ports_lock);
237         mutex_init(&client->ports_mutex);
238         INIT_LIST_HEAD(&client->ports_list_head);
239 
240         /* find free slot in the client table */
241         spin_lock_irqsave(&clients_lock, flags);
242         if (client_index < 0) {
243                 for (c = SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN;
244                      c < SNDRV_SEQ_MAX_CLIENTS;
245                      c++) {
246                         if (clienttab[c] || clienttablock[c])
247                                 continue;
248                         clienttab[client->number = c] = client;
249                         spin_unlock_irqrestore(&clients_lock, flags);
250                         return client;
251                 }
252         } else {
253                 if (clienttab[client_index] == NULL && !clienttablock[client_index]) {
254                         clienttab[client->number = client_index] = client;
255                         spin_unlock_irqrestore(&clients_lock, flags);
256                         return client;
257                 }
258         }
259         spin_unlock_irqrestore(&clients_lock, flags);
260         snd_seq_pool_delete(&client->pool);
261         kfree(client);
262         return NULL;    /* no free slot found or busy, return failure code */
263 }
264 
265 
266 static int seq_free_client1(struct snd_seq_client *client)
267 {
268         unsigned long flags;
269 
270         if (!client)
271                 return 0;
272         snd_seq_delete_all_ports(client);
273         snd_seq_queue_client_leave(client->number);
274         spin_lock_irqsave(&clients_lock, flags);
275         clienttablock[client->number] = 1;
276         clienttab[client->number] = NULL;
277         spin_unlock_irqrestore(&clients_lock, flags);
278         snd_use_lock_sync(&client->use_lock);
279         snd_seq_queue_client_termination(client->number);
280         if (client->pool)
281                 snd_seq_pool_delete(&client->pool);
282         spin_lock_irqsave(&clients_lock, flags);
283         clienttablock[client->number] = 0;
284         spin_unlock_irqrestore(&clients_lock, flags);
285         return 0;
286 }
287 
288 
289 static void seq_free_client(struct snd_seq_client * client)
290 {
291         mutex_lock(&register_mutex);
292         switch (client->type) {
293         case NO_CLIENT:
294                 pr_warn("ALSA: seq: Trying to free unused client %d\n",
295                         client->number);
296                 break;
297         case USER_CLIENT:
298         case KERNEL_CLIENT:
299                 seq_free_client1(client);
300                 usage_free(&client_usage, 1);
301                 break;
302 
303         default:
304                 pr_err("ALSA: seq: Trying to free client %d with undefined type = %d\n",
305                            client->number, client->type);
306         }
307         mutex_unlock(&register_mutex);
308 
309         snd_seq_system_client_ev_client_exit(client->number);
310 }
311 
312 
313 
314 /* -------------------------------------------------------- */
315 
316 /* create a user client */
317 static int snd_seq_open(struct inode *inode, struct file *file)
318 {
319         int c, mode;                    /* client id */
320         struct snd_seq_client *client;
321         struct snd_seq_user_client *user;
322         int err;
323 
324         err = nonseekable_open(inode, file);
325         if (err < 0)
326                 return err;
327 
328         if (mutex_lock_interruptible(&register_mutex))
329                 return -ERESTARTSYS;
330         client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS);
331         if (client == NULL) {
332                 mutex_unlock(&register_mutex);
333                 return -ENOMEM; /* failure code */
334         }
335 
336         mode = snd_seq_file_flags(file);
337         if (mode & SNDRV_SEQ_LFLG_INPUT)
338                 client->accept_input = 1;
339         if (mode & SNDRV_SEQ_LFLG_OUTPUT)
340                 client->accept_output = 1;
341 
342         user = &client->data.user;
343         user->fifo = NULL;
344         user->fifo_pool_size = 0;
345 
346         if (mode & SNDRV_SEQ_LFLG_INPUT) {
347                 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS;
348                 user->fifo = snd_seq_fifo_new(user->fifo_pool_size);
349                 if (user->fifo == NULL) {
350                         seq_free_client1(client);
351                         kfree(client);
352                         mutex_unlock(&register_mutex);
353                         return -ENOMEM;
354                 }
355         }
356 
357         usage_alloc(&client_usage, 1);
358         client->type = USER_CLIENT;
359         mutex_unlock(&register_mutex);
360 
361         c = client->number;
362         file->private_data = client;
363 
364         /* fill client data */
365         user->file = file;
366         sprintf(client->name, "Client-%d", c);
367         client->data.user.owner = get_pid(task_pid(current));
368 
369         /* make others aware this new client */
370         snd_seq_system_client_ev_client_start(c);
371 
372         return 0;
373 }
374 
375 /* delete a user client */
376 static int snd_seq_release(struct inode *inode, struct file *file)
377 {
378         struct snd_seq_client *client = file->private_data;
379 
380         if (client) {
381                 seq_free_client(client);
382                 if (client->data.user.fifo)
383                         snd_seq_fifo_delete(&client->data.user.fifo);
384                 put_pid(client->data.user.owner);
385                 kfree(client);
386         }
387 
388         return 0;
389 }
390 
391 
392 /* handle client read() */
393 /* possible error values:
394  *      -ENXIO  invalid client or file open mode
395  *      -ENOSPC FIFO overflow (the flag is cleared after this error report)
396  *      -EINVAL no enough user-space buffer to write the whole event
397  *      -EFAULT seg. fault during copy to user space
398  */
399 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count,
400                             loff_t *offset)
401 {
402         struct snd_seq_client *client = file->private_data;
403         struct snd_seq_fifo *fifo;
404         int err;
405         long result = 0;
406         struct snd_seq_event_cell *cell;
407 
408         if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT))
409                 return -ENXIO;
410 
411         if (!access_ok(VERIFY_WRITE, buf, count))
412                 return -EFAULT;
413 
414         /* check client structures are in place */
415         if (snd_BUG_ON(!client))
416                 return -ENXIO;
417 
418         if (!client->accept_input || (fifo = client->data.user.fifo) == NULL)
419                 return -ENXIO;
420 
421         if (atomic_read(&fifo->overflow) > 0) {
422                 /* buffer overflow is detected */
423                 snd_seq_fifo_clear(fifo);
424                 /* return error code */
425                 return -ENOSPC;
426         }
427 
428         cell = NULL;
429         err = 0;
430         snd_seq_fifo_lock(fifo);
431 
432         /* while data available in queue */
433         while (count >= sizeof(struct snd_seq_event)) {
434                 int nonblock;
435 
436                 nonblock = (file->f_flags & O_NONBLOCK) || result > 0;
437                 if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) {
438                         break;
439                 }
440                 if (snd_seq_ev_is_variable(&cell->event)) {
441                         struct snd_seq_event tmpev;
442                         tmpev = cell->event;
443                         tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
444                         if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) {
445                                 err = -EFAULT;
446                                 break;
447                         }
448                         count -= sizeof(struct snd_seq_event);
449                         buf += sizeof(struct snd_seq_event);
450                         err = snd_seq_expand_var_event(&cell->event, count,
451                                                        (char __force *)buf, 0,
452                                                        sizeof(struct snd_seq_event));
453                         if (err < 0)
454                                 break;
455                         result += err;
456                         count -= err;
457                         buf += err;
458                 } else {
459                         if (copy_to_user(buf, &cell->event, sizeof(struct snd_seq_event))) {
460                                 err = -EFAULT;
461                                 break;
462                         }
463                         count -= sizeof(struct snd_seq_event);
464                         buf += sizeof(struct snd_seq_event);
465                 }
466                 snd_seq_cell_free(cell);
467                 cell = NULL; /* to be sure */
468                 result += sizeof(struct snd_seq_event);
469         }
470 
471         if (err < 0) {
472                 if (cell)
473                         snd_seq_fifo_cell_putback(fifo, cell);
474                 if (err == -EAGAIN && result > 0)
475                         err = 0;
476         }
477         snd_seq_fifo_unlock(fifo);
478 
479         return (err < 0) ? err : result;
480 }
481 
482 
483 /*
484  * check access permission to the port
485  */
486 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags)
487 {
488         if ((port->capability & flags) != flags)
489                 return 0;
490         return flags;
491 }
492 
493 /*
494  * check if the destination client is available, and return the pointer
495  * if filter is non-zero, client filter bitmap is tested.
496  */
497 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event,
498                                                     int filter)
499 {
500         struct snd_seq_client *dest;
501 
502         dest = snd_seq_client_use_ptr(event->dest.client);
503         if (dest == NULL)
504                 return NULL;
505         if (! dest->accept_input)
506                 goto __not_avail;
507         if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) &&
508             ! test_bit(event->type, dest->event_filter))
509                 goto __not_avail;
510         if (filter && !(dest->filter & filter))
511                 goto __not_avail;
512 
513         return dest; /* ok - accessible */
514 __not_avail:
515         snd_seq_client_unlock(dest);
516         return NULL;
517 }
518 
519 
520 /*
521  * Return the error event.
522  *
523  * If the receiver client is a user client, the original event is
524  * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event.  If
525  * the original event is also variable length, the external data is
526  * copied after the event record. 
527  * If the receiver client is a kernel client, the original event is
528  * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra
529  * kmalloc.
530  */
531 static int bounce_error_event(struct snd_seq_client *client,
532                               struct snd_seq_event *event,
533                               int err, int atomic, int hop)
534 {
535         struct snd_seq_event bounce_ev;
536         int result;
537 
538         if (client == NULL ||
539             ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) ||
540             ! client->accept_input)
541                 return 0; /* ignored */
542 
543         /* set up quoted error */
544         memset(&bounce_ev, 0, sizeof(bounce_ev));
545         bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR;
546         bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED;
547         bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT;
548         bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
549         bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
550         bounce_ev.dest.client = client->number;
551         bounce_ev.dest.port = event->source.port;
552         bounce_ev.data.quote.origin = event->dest;
553         bounce_ev.data.quote.event = event;
554         bounce_ev.data.quote.value = -err; /* use positive value */
555         result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1);
556         if (result < 0) {
557                 client->event_lost++;
558                 return result;
559         }
560 
561         return result;
562 }
563 
564 
565 /*
566  * rewrite the time-stamp of the event record with the curren time
567  * of the given queue.
568  * return non-zero if updated.
569  */
570 static int update_timestamp_of_queue(struct snd_seq_event *event,
571                                      int queue, int real_time)
572 {
573         struct snd_seq_queue *q;
574 
575         q = queueptr(queue);
576         if (! q)
577                 return 0;
578         event->queue = queue;
579         event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK;
580         if (real_time) {
581                 event->time.time = snd_seq_timer_get_cur_time(q->timer);
582                 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL;
583         } else {
584                 event->time.tick = snd_seq_timer_get_cur_tick(q->timer);
585                 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK;
586         }
587         queuefree(q);
588         return 1;
589 }
590 
591 
592 /*
593  * deliver an event to the specified destination.
594  * if filter is non-zero, client filter bitmap is tested.
595  *
596  *  RETURN VALUE: 0 : if succeeded
597  *               <0 : error
598  */
599 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
600                                         struct snd_seq_event *event,
601                                         int filter, int atomic, int hop)
602 {
603         struct snd_seq_client *dest = NULL;
604         struct snd_seq_client_port *dest_port = NULL;
605         int result = -ENOENT;
606         int direct;
607 
608         direct = snd_seq_ev_is_direct(event);
609 
610         dest = get_event_dest_client(event, filter);
611         if (dest == NULL)
612                 goto __skip;
613         dest_port = snd_seq_port_use_ptr(dest, event->dest.port);
614         if (dest_port == NULL)
615                 goto __skip;
616 
617         /* check permission */
618         if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) {
619                 result = -EPERM;
620                 goto __skip;
621         }
622                 
623         if (dest_port->timestamping)
624                 update_timestamp_of_queue(event, dest_port->time_queue,
625                                           dest_port->time_real);
626 
627         switch (dest->type) {
628         case USER_CLIENT:
629                 if (dest->data.user.fifo)
630                         result = snd_seq_fifo_event_in(dest->data.user.fifo, event);
631                 break;
632 
633         case KERNEL_CLIENT:
634                 if (dest_port->event_input == NULL)
635                         break;
636                 result = dest_port->event_input(event, direct,
637                                                 dest_port->private_data,
638                                                 atomic, hop);
639                 break;
640         default:
641                 break;
642         }
643 
644   __skip:
645         if (dest_port)
646                 snd_seq_port_unlock(dest_port);
647         if (dest)
648                 snd_seq_client_unlock(dest);
649 
650         if (result < 0 && !direct) {
651                 result = bounce_error_event(client, event, result, atomic, hop);
652         }
653         return result;
654 }
655 
656 
657 /*
658  * send the event to all subscribers:
659  */
660 static int deliver_to_subscribers(struct snd_seq_client *client,
661                                   struct snd_seq_event *event,
662                                   int atomic, int hop)
663 {
664         struct snd_seq_subscribers *subs;
665         int err, result = 0, num_ev = 0;
666         struct snd_seq_event event_saved;
667         struct snd_seq_client_port *src_port;
668         struct snd_seq_port_subs_info *grp;
669 
670         src_port = snd_seq_port_use_ptr(client, event->source.port);
671         if (src_port == NULL)
672                 return -EINVAL; /* invalid source port */
673         /* save original event record */
674         event_saved = *event;
675         grp = &src_port->c_src;
676         
677         /* lock list */
678         if (atomic)
679                 read_lock(&grp->list_lock);
680         else
681                 down_read(&grp->list_mutex);
682         list_for_each_entry(subs, &grp->list_head, src_list) {
683                 /* both ports ready? */
684                 if (atomic_read(&subs->ref_count) != 2)
685                         continue;
686                 event->dest = subs->info.dest;
687                 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
688                         /* convert time according to flag with subscription */
689                         update_timestamp_of_queue(event, subs->info.queue,
690                                                   subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL);
691                 err = snd_seq_deliver_single_event(client, event,
692                                                    0, atomic, hop);
693                 if (err < 0) {
694                         /* save first error that occurs and continue */
695                         if (!result)
696                                 result = err;
697                         continue;
698                 }
699                 num_ev++;
700                 /* restore original event record */
701                 *event = event_saved;
702         }
703         if (atomic)
704                 read_unlock(&grp->list_lock);
705         else
706                 up_read(&grp->list_mutex);
707         *event = event_saved; /* restore */
708         snd_seq_port_unlock(src_port);
709         return (result < 0) ? result : num_ev;
710 }
711 
712 
713 #ifdef SUPPORT_BROADCAST 
714 /*
715  * broadcast to all ports:
716  */
717 static int port_broadcast_event(struct snd_seq_client *client,
718                                 struct snd_seq_event *event,
719                                 int atomic, int hop)
720 {
721         int num_ev = 0, err, result = 0;
722         struct snd_seq_client *dest_client;
723         struct snd_seq_client_port *port;
724 
725         dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST);
726         if (dest_client == NULL)
727                 return 0; /* no matching destination */
728 
729         read_lock(&dest_client->ports_lock);
730         list_for_each_entry(port, &dest_client->ports_list_head, list) {
731                 event->dest.port = port->addr.port;
732                 /* pass NULL as source client to avoid error bounce */
733                 err = snd_seq_deliver_single_event(NULL, event,
734                                                    SNDRV_SEQ_FILTER_BROADCAST,
735                                                    atomic, hop);
736                 if (err < 0) {
737                         /* save first error that occurs and continue */
738                         if (!result)
739                                 result = err;
740                         continue;
741                 }
742                 num_ev++;
743         }
744         read_unlock(&dest_client->ports_lock);
745         snd_seq_client_unlock(dest_client);
746         event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */
747         return (result < 0) ? result : num_ev;
748 }
749 
750 /*
751  * send the event to all clients:
752  * if destination port is also ADDRESS_BROADCAST, deliver to all ports.
753  */
754 static int broadcast_event(struct snd_seq_client *client,
755                            struct snd_seq_event *event, int atomic, int hop)
756 {
757         int err, result = 0, num_ev = 0;
758         int dest;
759         struct snd_seq_addr addr;
760 
761         addr = event->dest; /* save */
762 
763         for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) {
764                 /* don't send to itself */
765                 if (dest == client->number)
766                         continue;
767                 event->dest.client = dest;
768                 event->dest.port = addr.port;
769                 if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST)
770                         err = port_broadcast_event(client, event, atomic, hop);
771                 else
772                         /* pass NULL as source client to avoid error bounce */
773                         err = snd_seq_deliver_single_event(NULL, event,
774                                                            SNDRV_SEQ_FILTER_BROADCAST,
775                                                            atomic, hop);
776                 if (err < 0) {
777                         /* save first error that occurs and continue */
778                         if (!result)
779                                 result = err;
780                         continue;
781                 }
782                 num_ev += err;
783         }
784         event->dest = addr; /* restore */
785         return (result < 0) ? result : num_ev;
786 }
787 
788 
789 /* multicast - not supported yet */
790 static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event,
791                            int atomic, int hop)
792 {
793         pr_debug("ALSA: seq: multicast not supported yet.\n");
794         return 0; /* ignored */
795 }
796 #endif /* SUPPORT_BROADCAST */
797 
798 
799 /* deliver an event to the destination port(s).
800  * if the event is to subscribers or broadcast, the event is dispatched
801  * to multiple targets.
802  *
803  * RETURN VALUE: n > 0  : the number of delivered events.
804  *               n == 0 : the event was not passed to any client.
805  *               n < 0  : error - event was not processed.
806  */
807 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event,
808                                  int atomic, int hop)
809 {
810         int result;
811 
812         hop++;
813         if (hop >= SNDRV_SEQ_MAX_HOPS) {
814                 pr_debug("ALSA: seq: too long delivery path (%d:%d->%d:%d)\n",
815                            event->source.client, event->source.port,
816                            event->dest.client, event->dest.port);
817                 return -EMLINK;
818         }
819 
820         if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS ||
821             event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS)
822                 result = deliver_to_subscribers(client, event, atomic, hop);
823 #ifdef SUPPORT_BROADCAST
824         else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST ||
825                  event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST)
826                 result = broadcast_event(client, event, atomic, hop);
827         else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS)
828                 result = multicast_event(client, event, atomic, hop);
829         else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST)
830                 result = port_broadcast_event(client, event, atomic, hop);
831 #endif
832         else
833                 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop);
834 
835         return result;
836 }
837 
838 /*
839  * dispatch an event cell:
840  * This function is called only from queue check routines in timer
841  * interrupts or after enqueued.
842  * The event cell shall be released or re-queued in this function.
843  *
844  * RETURN VALUE: n > 0  : the number of delivered events.
845  *               n == 0 : the event was not passed to any client.
846  *               n < 0  : error - event was not processed.
847  */
848 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop)
849 {
850         struct snd_seq_client *client;
851         int result;
852 
853         if (snd_BUG_ON(!cell))
854                 return -EINVAL;
855 
856         client = snd_seq_client_use_ptr(cell->event.source.client);
857         if (client == NULL) {
858                 snd_seq_cell_free(cell); /* release this cell */
859                 return -EINVAL;
860         }
861 
862         if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) {
863                 /* NOTE event:
864                  * the event cell is re-used as a NOTE-OFF event and
865                  * enqueued again.
866                  */
867                 struct snd_seq_event tmpev, *ev;
868 
869                 /* reserve this event to enqueue note-off later */
870                 tmpev = cell->event;
871                 tmpev.type = SNDRV_SEQ_EVENT_NOTEON;
872                 result = snd_seq_deliver_event(client, &tmpev, atomic, hop);
873 
874                 /*
875                  * This was originally a note event.  We now re-use the
876                  * cell for the note-off event.
877                  */
878 
879                 ev = &cell->event;
880                 ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
881                 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH;
882 
883                 /* add the duration time */
884                 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) {
885                 case SNDRV_SEQ_TIME_STAMP_TICK:
886                         ev->time.tick += ev->data.note.duration;
887                         break;
888                 case SNDRV_SEQ_TIME_STAMP_REAL:
889                         /* unit for duration is ms */
890                         ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000);
891                         ev->time.time.tv_sec += ev->data.note.duration / 1000 +
892                                                 ev->time.time.tv_nsec / 1000000000;
893                         ev->time.time.tv_nsec %= 1000000000;
894                         break;
895                 }
896                 ev->data.note.velocity = ev->data.note.off_velocity;
897 
898                 /* Now queue this cell as the note off event */
899                 if (snd_seq_enqueue_event(cell, atomic, hop) < 0)
900                         snd_seq_cell_free(cell); /* release this cell */
901 
902         } else {
903                 /* Normal events:
904                  * event cell is freed after processing the event
905                  */
906 
907                 result = snd_seq_deliver_event(client, &cell->event, atomic, hop);
908                 snd_seq_cell_free(cell);
909         }
910 
911         snd_seq_client_unlock(client);
912         return result;
913 }
914 
915 
916 /* Allocate a cell from client pool and enqueue it to queue:
917  * if pool is empty and blocking is TRUE, sleep until a new cell is
918  * available.
919  */
920 static int snd_seq_client_enqueue_event(struct snd_seq_client *client,
921                                         struct snd_seq_event *event,
922                                         struct file *file, int blocking,
923                                         int atomic, int hop)
924 {
925         struct snd_seq_event_cell *cell;
926         int err;
927 
928         /* special queue values - force direct passing */
929         if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
930                 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
931                 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
932         } else
933 #ifdef SUPPORT_BROADCAST
934                 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) {
935                         event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST;
936                         event->queue = SNDRV_SEQ_QUEUE_DIRECT;
937                 }
938 #endif
939         if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
940                 /* check presence of source port */
941                 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port);
942                 if (src_port == NULL)
943                         return -EINVAL;
944                 snd_seq_port_unlock(src_port);
945         }
946 
947         /* direct event processing without enqueued */
948         if (snd_seq_ev_is_direct(event)) {
949                 if (event->type == SNDRV_SEQ_EVENT_NOTE)
950                         return -EINVAL; /* this event must be enqueued! */
951                 return snd_seq_deliver_event(client, event, atomic, hop);
952         }
953 
954         /* Not direct, normal queuing */
955         if (snd_seq_queue_is_used(event->queue, client->number) <= 0)
956                 return -EINVAL;  /* invalid queue */
957         if (! snd_seq_write_pool_allocated(client))
958                 return -ENXIO; /* queue is not allocated */
959 
960         /* allocate an event cell */
961         err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, file);
962         if (err < 0)
963                 return err;
964 
965         /* we got a cell. enqueue it. */
966         if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
967                 snd_seq_cell_free(cell);
968                 return err;
969         }
970 
971         return 0;
972 }
973 
974 
975 /*
976  * check validity of event type and data length.
977  * return non-zero if invalid.
978  */
979 static int check_event_type_and_length(struct snd_seq_event *ev)
980 {
981         switch (snd_seq_ev_length_type(ev)) {
982         case SNDRV_SEQ_EVENT_LENGTH_FIXED:
983                 if (snd_seq_ev_is_variable_type(ev))
984                         return -EINVAL;
985                 break;
986         case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
987                 if (! snd_seq_ev_is_variable_type(ev) ||
988                     (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
989                         return -EINVAL;
990                 break;
991         case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
992                 if (! snd_seq_ev_is_direct(ev))
993                         return -EINVAL;
994                 break;
995         }
996         return 0;
997 }
998 
999 
1000 /* handle write() */
1001 /* possible error values:
1002  *      -ENXIO  invalid client or file open mode
1003  *      -ENOMEM malloc failed
1004  *      -EFAULT seg. fault during copy from user space
1005  *      -EINVAL invalid event
1006  *      -EAGAIN no space in output pool
1007  *      -EINTR  interrupts while sleep
1008  *      -EMLINK too many hops
1009  *      others  depends on return value from driver callback
1010  */
1011 static ssize_t snd_seq_write(struct file *file, const char __user *buf,
1012                              size_t count, loff_t *offset)
1013 {
1014         struct snd_seq_client *client = file->private_data;
1015         int written = 0, len;
1016         int err = -EINVAL;
1017         struct snd_seq_event event;
1018 
1019         if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
1020                 return -ENXIO;
1021 
1022         /* check client structures are in place */
1023         if (snd_BUG_ON(!client))
1024                 return -ENXIO;
1025                 
1026         if (!client->accept_output || client->pool == NULL)
1027                 return -ENXIO;
1028 
1029         /* allocate the pool now if the pool is not allocated yet */ 
1030         if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
1031                 if (snd_seq_pool_init(client->pool) < 0)
1032                         return -ENOMEM;
1033         }
1034 
1035         /* only process whole events */
1036         while (count >= sizeof(struct snd_seq_event)) {
1037                 /* Read in the event header from the user */
1038                 len = sizeof(event);
1039                 if (copy_from_user(&event, buf, len)) {
1040                         err = -EFAULT;
1041                         break;
1042                 }
1043                 event.source.client = client->number;   /* fill in client number */
1044                 /* Check for extension data length */
1045                 if (check_event_type_and_length(&event)) {
1046                         err = -EINVAL;
1047                         break;
1048                 }
1049 
1050                 /* check for special events */
1051                 if (event.type == SNDRV_SEQ_EVENT_NONE)
1052                         goto __skip_event;
1053                 else if (snd_seq_ev_is_reserved(&event)) {
1054                         err = -EINVAL;
1055                         break;
1056                 }
1057 
1058                 if (snd_seq_ev_is_variable(&event)) {
1059                         int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK;
1060                         if ((size_t)(extlen + len) > count) {
1061                                 /* back out, will get an error this time or next */
1062                                 err = -EINVAL;
1063                                 break;
1064                         }
1065                         /* set user space pointer */
1066                         event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
1067                         event.data.ext.ptr = (char __force *)buf
1068                                                 + sizeof(struct snd_seq_event);
1069                         len += extlen; /* increment data length */
1070                 } else {
1071 #ifdef CONFIG_COMPAT
1072                         if (client->convert32 && snd_seq_ev_is_varusr(&event)) {
1073                                 void *ptr = (void __force *)compat_ptr(event.data.raw32.d[1]);
1074                                 event.data.ext.ptr = ptr;
1075                         }
1076 #endif
1077                 }
1078 
1079                 /* ok, enqueue it */
1080                 err = snd_seq_client_enqueue_event(client, &event, file,
1081                                                    !(file->f_flags & O_NONBLOCK),
1082                                                    0, 0);
1083                 if (err < 0)
1084                         break;
1085 
1086         __skip_event:
1087                 /* Update pointers and counts */
1088                 count -= len;
1089                 buf += len;
1090                 written += len;
1091         }
1092 
1093         return written ? written : err;
1094 }
1095 
1096 
1097 /*
1098  * handle polling
1099  */
1100 static unsigned int snd_seq_poll(struct file *file, poll_table * wait)
1101 {
1102         struct snd_seq_client *client = file->private_data;
1103         unsigned int mask = 0;
1104 
1105         /* check client structures are in place */
1106         if (snd_BUG_ON(!client))
1107                 return -ENXIO;
1108 
1109         if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1110             client->data.user.fifo) {
1111 
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;
1115         }
1116 
1117         if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1118 
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;
1123         }
1124 
1125         return mask;
1126 }
1127 
1128 
1129 /*-----------------------------------------------------*/
1130 
1131 
1132 /* SYSTEM_INFO ioctl() */
1133 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void __user *arg)
1134 {
1135         struct snd_seq_system_info info;
1136 
1137         memset(&info, 0, sizeof(info));
1138         /* fill the info fields */
1139         info.queues = SNDRV_SEQ_MAX_QUEUES;
1140         info.clients = SNDRV_SEQ_MAX_CLIENTS;
1141         info.ports = SNDRV_SEQ_MAX_PORTS;
1142         info.channels = 256;    /* fixed limit */
1143         info.cur_clients = client_usage.cur;
1144         info.cur_queues = snd_seq_queue_get_cur_queues();
1145 
1146         if (copy_to_user(arg, &info, sizeof(info)))
1147                 return -EFAULT;
1148         return 0;
1149 }
1150 
1151 
1152 /* RUNNING_MODE ioctl() */
1153 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void __user *arg)
1154 {
1155         struct snd_seq_running_info info;
1156         struct snd_seq_client *cptr;
1157         int err = 0;
1158 
1159         if (copy_from_user(&info, arg, sizeof(info)))
1160                 return -EFAULT;
1161 
1162         /* requested client number */
1163         cptr = snd_seq_client_use_ptr(info.client);
1164         if (cptr == NULL)
1165                 return -ENOENT;         /* don't change !!! */
1166 
1167 #ifdef SNDRV_BIG_ENDIAN
1168         if (! info.big_endian) {
1169                 err = -EINVAL;
1170                 goto __err;
1171         }
1172 #else
1173         if (info.big_endian) {
1174                 err = -EINVAL;
1175                 goto __err;
1176         }
1177 
1178 #endif
1179         if (info.cpu_mode > sizeof(long)) {
1180                 err = -EINVAL;
1181                 goto __err;
1182         }
1183         cptr->convert32 = (info.cpu_mode < sizeof(long));
1184  __err:
1185         snd_seq_client_unlock(cptr);
1186         return err;
1187 }
1188 
1189 /* CLIENT_INFO ioctl() */
1190 static void get_client_info(struct snd_seq_client *cptr,
1191                             struct snd_seq_client_info *info)
1192 {
1193         info->client = cptr->number;
1194 
1195         /* fill the info fields */
1196         info->type = cptr->type;
1197         strcpy(info->name, cptr->name);
1198         info->filter = cptr->filter;
1199         info->event_lost = cptr->event_lost;
1200         memcpy(info->event_filter, cptr->event_filter, 32);
1201         info->num_ports = cptr->num_ports;
1202 
1203         if (cptr->type == USER_CLIENT)
1204                 info->pid = pid_vnr(cptr->data.user.owner);
1205         else
1206                 info->pid = -1;
1207 
1208         if (cptr->type == KERNEL_CLIENT)
1209                 info->card = cptr->data.kernel.card ? cptr->data.kernel.card->number : -1;
1210         else
1211                 info->card = -1;
1212 
1213         memset(info->reserved, 0, sizeof(info->reserved));
1214 }
1215 
1216 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
1217                                          void __user *arg)
1218 {
1219         struct snd_seq_client *cptr;
1220         struct snd_seq_client_info client_info;
1221 
1222         if (copy_from_user(&client_info, arg, sizeof(client_info)))
1223                 return -EFAULT;
1224 
1225         /* requested client number */
1226         cptr = snd_seq_client_use_ptr(client_info.client);
1227         if (cptr == NULL)
1228                 return -ENOENT;         /* don't change !!! */
1229 
1230         get_client_info(cptr, &client_info);
1231         snd_seq_client_unlock(cptr);
1232 
1233         if (copy_to_user(arg, &client_info, sizeof(client_info)))
1234                 return -EFAULT;
1235         return 0;
1236 }
1237 
1238 
1239 /* CLIENT_INFO ioctl() */
1240 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
1241                                          void __user *arg)
1242 {
1243         struct snd_seq_client_info client_info;
1244 
1245         if (copy_from_user(&client_info, arg, sizeof(client_info)))
1246                 return -EFAULT;
1247 
1248         /* it is not allowed to set the info fields for an another client */
1249         if (client->number != client_info.client)
1250                 return -EPERM;
1251         /* also client type must be set now */
1252         if (client->type != client_info.type)
1253                 return -EINVAL;
1254 
1255         /* fill the info fields */
1256         if (client_info.name[0])
1257                 strlcpy(client->name, client_info.name, sizeof(client->name));
1258 
1259         client->filter = client_info.filter;
1260         client->event_lost = client_info.event_lost;
1261         memcpy(client->event_filter, client_info.event_filter, 32);
1262 
1263         return 0;
1264 }
1265 
1266 
1267 /* 
1268  * CREATE PORT ioctl() 
1269  */
1270 static int snd_seq_ioctl_create_port(struct snd_seq_client *client,
1271                                      void __user *arg)
1272 {
1273         struct snd_seq_client_port *port;
1274         struct snd_seq_port_info info;
1275         struct snd_seq_port_callback *callback;
1276 
1277         if (copy_from_user(&info, arg, sizeof(info)))
1278                 return -EFAULT;
1279 
1280         /* it is not allowed to create the port for an another client */
1281         if (info.addr.client != client->number)
1282                 return -EPERM;
1283 
1284         port = snd_seq_create_port(client, (info.flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info.addr.port : -1);
1285         if (port == NULL)
1286                 return -ENOMEM;
1287 
1288         if (client->type == USER_CLIENT && info.kernel) {
1289                 snd_seq_delete_port(client, port->addr.port);
1290                 return -EINVAL;
1291         }
1292         if (client->type == KERNEL_CLIENT) {
1293                 if ((callback = info.kernel) != NULL) {
1294                         if (callback->owner)
1295                                 port->owner = callback->owner;
1296                         port->private_data = callback->private_data;
1297                         port->private_free = callback->private_free;
1298                         port->event_input = callback->event_input;
1299                         port->c_src.open = callback->subscribe;
1300                         port->c_src.close = callback->unsubscribe;
1301                         port->c_dest.open = callback->use;
1302                         port->c_dest.close = callback->unuse;
1303                 }
1304         }
1305 
1306         info.addr = port->addr;
1307 
1308         snd_seq_set_port_info(port, &info);
1309         snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1310 
1311         if (copy_to_user(arg, &info, sizeof(info)))
1312                 return -EFAULT;
1313 
1314         return 0;
1315 }
1316 
1317 /* 
1318  * DELETE PORT ioctl() 
1319  */
1320 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client,
1321                                      void __user *arg)
1322 {
1323         struct snd_seq_port_info info;
1324         int err;
1325 
1326         /* set passed parameters */
1327         if (copy_from_user(&info, arg, sizeof(info)))
1328                 return -EFAULT;
1329         
1330         /* it is not allowed to remove the port for an another client */
1331         if (info.addr.client != client->number)
1332                 return -EPERM;
1333 
1334         err = snd_seq_delete_port(client, info.addr.port);
1335         if (err >= 0)
1336                 snd_seq_system_client_ev_port_exit(client->number, info.addr.port);
1337         return err;
1338 }
1339 
1340 
1341 /* 
1342  * GET_PORT_INFO ioctl() (on any client) 
1343  */
1344 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client,
1345                                        void __user *arg)
1346 {
1347         struct snd_seq_client *cptr;
1348         struct snd_seq_client_port *port;
1349         struct snd_seq_port_info info;
1350 
1351         if (copy_from_user(&info, arg, sizeof(info)))
1352                 return -EFAULT;
1353         cptr = snd_seq_client_use_ptr(info.addr.client);
1354         if (cptr == NULL)
1355                 return -ENXIO;
1356 
1357         port = snd_seq_port_use_ptr(cptr, info.addr.port);
1358         if (port == NULL) {
1359                 snd_seq_client_unlock(cptr);
1360                 return -ENOENT;                 /* don't change */
1361         }
1362 
1363         /* get port info */
1364         snd_seq_get_port_info(port, &info);
1365         snd_seq_port_unlock(port);
1366         snd_seq_client_unlock(cptr);
1367 
1368         if (copy_to_user(arg, &info, sizeof(info)))
1369                 return -EFAULT;
1370         return 0;
1371 }
1372 
1373 
1374 /* 
1375  * SET_PORT_INFO ioctl() (only ports on this/own client) 
1376  */
1377 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client,
1378                                        void __user *arg)
1379 {
1380         struct snd_seq_client_port *port;
1381         struct snd_seq_port_info info;
1382 
1383         if (copy_from_user(&info, arg, sizeof(info)))
1384                 return -EFAULT;
1385 
1386         if (info.addr.client != client->number) /* only set our own ports ! */
1387                 return -EPERM;
1388         port = snd_seq_port_use_ptr(client, info.addr.port);
1389         if (port) {
1390                 snd_seq_set_port_info(port, &info);
1391                 snd_seq_port_unlock(port);
1392         }
1393         return 0;
1394 }
1395 
1396 
1397 /*
1398  * port subscription (connection)
1399  */
1400 #define PERM_RD         (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1401 #define PERM_WR         (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1402 
1403 static int check_subscription_permission(struct snd_seq_client *client,
1404                                          struct snd_seq_client_port *sport,
1405                                          struct snd_seq_client_port *dport,
1406                                          struct snd_seq_port_subscribe *subs)
1407 {
1408         if (client->number != subs->sender.client &&
1409             client->number != subs->dest.client) {
1410                 /* connection by third client - check export permission */
1411                 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1412                         return -EPERM;
1413                 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1414                         return -EPERM;
1415         }
1416 
1417         /* check read permission */
1418         /* if sender or receiver is the subscribing client itself,
1419          * no permission check is necessary
1420          */
1421         if (client->number != subs->sender.client) {
1422                 if (! check_port_perm(sport, PERM_RD))
1423                         return -EPERM;
1424         }
1425         /* check write permission */
1426         if (client->number != subs->dest.client) {
1427                 if (! check_port_perm(dport, PERM_WR))
1428                         return -EPERM;
1429         }
1430         return 0;
1431 }
1432 
1433 /*
1434  * send an subscription notify event to user client:
1435  * client must be user client.
1436  */
1437 int snd_seq_client_notify_subscription(int client, int port,
1438                                        struct snd_seq_port_subscribe *info,
1439                                        int evtype)
1440 {
1441         struct snd_seq_event event;
1442 
1443         memset(&event, 0, sizeof(event));
1444         event.type = evtype;
1445         event.data.connect.dest = info->dest;
1446         event.data.connect.sender = info->sender;
1447 
1448         return snd_seq_system_notify(client, port, &event);  /* non-atomic */
1449 }
1450 
1451 
1452 /* 
1453  * add to port's subscription list IOCTL interface 
1454  */
1455 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
1456                                         void __user *arg)
1457 {
1458         int result = -EINVAL;
1459         struct snd_seq_client *receiver = NULL, *sender = NULL;
1460         struct snd_seq_client_port *sport = NULL, *dport = NULL;
1461         struct snd_seq_port_subscribe subs;
1462 
1463         if (copy_from_user(&subs, arg, sizeof(subs)))
1464                 return -EFAULT;
1465 
1466         if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1467                 goto __end;
1468         if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1469                 goto __end;
1470         if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1471                 goto __end;
1472         if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1473                 goto __end;
1474 
1475         result = check_subscription_permission(client, sport, dport, &subs);
1476         if (result < 0)
1477                 goto __end;
1478 
1479         /* connect them */
1480         result = snd_seq_port_connect(client, sender, sport, receiver, dport, &subs);
1481         if (! result) /* broadcast announce */
1482                 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1483                                                    &subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1484       __end:
1485         if (sport)
1486                 snd_seq_port_unlock(sport);
1487         if (dport)
1488                 snd_seq_port_unlock(dport);
1489         if (sender)
1490                 snd_seq_client_unlock(sender);
1491         if (receiver)
1492                 snd_seq_client_unlock(receiver);
1493         return result;
1494 }
1495 
1496 
1497 /* 
1498  * remove from port's subscription list 
1499  */
1500 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
1501                                           void __user *arg)
1502 {
1503         int result = -ENXIO;
1504         struct snd_seq_client *receiver = NULL, *sender = NULL;
1505         struct snd_seq_client_port *sport = NULL, *dport = NULL;
1506         struct snd_seq_port_subscribe subs;
1507 
1508         if (copy_from_user(&subs, arg, sizeof(subs)))
1509                 return -EFAULT;
1510 
1511         if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1512                 goto __end;
1513         if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1514                 goto __end;
1515         if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1516                 goto __end;
1517         if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1518                 goto __end;
1519 
1520         result = check_subscription_permission(client, sport, dport, &subs);
1521         if (result < 0)
1522                 goto __end;
1523 
1524         result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, &subs);
1525         if (! result) /* broadcast announce */
1526                 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1527                                                    &subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1528       __end:
1529         if (sport)
1530                 snd_seq_port_unlock(sport);
1531         if (dport)
1532                 snd_seq_port_unlock(dport);
1533         if (sender)
1534                 snd_seq_client_unlock(sender);
1535         if (receiver)
1536                 snd_seq_client_unlock(receiver);
1537         return result;
1538 }
1539 
1540 
1541 /* CREATE_QUEUE ioctl() */
1542 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client,
1543                                       void __user *arg)
1544 {
1545         struct snd_seq_queue_info info;
1546         int result;
1547         struct snd_seq_queue *q;
1548 
1549         if (copy_from_user(&info, arg, sizeof(info)))
1550                 return -EFAULT;
1551 
1552         result = snd_seq_queue_alloc(client->number, info.locked, info.flags);
1553         if (result < 0)
1554                 return result;
1555 
1556         q = queueptr(result);
1557         if (q == NULL)
1558                 return -EINVAL;
1559 
1560         info.queue = q->queue;
1561         info.locked = q->locked;
1562         info.owner = q->owner;
1563 
1564         /* set queue name */
1565         if (! info.name[0])
1566                 snprintf(info.name, sizeof(info.name), "Queue-%d", q->queue);
1567         strlcpy(q->name, info.name, sizeof(q->name));
1568         queuefree(q);
1569 
1570         if (copy_to_user(arg, &info, sizeof(info)))
1571                 return -EFAULT;
1572 
1573         return 0;
1574 }
1575 
1576 /* DELETE_QUEUE ioctl() */
1577 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client,
1578                                       void __user *arg)
1579 {
1580         struct snd_seq_queue_info info;
1581 
1582         if (copy_from_user(&info, arg, sizeof(info)))
1583                 return -EFAULT;
1584 
1585         return snd_seq_queue_delete(client->number, info.queue);
1586 }
1587 
1588 /* GET_QUEUE_INFO ioctl() */
1589 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client,
1590                                         void __user *arg)
1591 {
1592         struct snd_seq_queue_info info;
1593         struct snd_seq_queue *q;
1594 
1595         if (copy_from_user(&info, arg, sizeof(info)))
1596                 return -EFAULT;
1597 
1598         q = queueptr(info.queue);
1599         if (q == NULL)
1600                 return -EINVAL;
1601 
1602         memset(&info, 0, sizeof(info));
1603         info.queue = q->queue;
1604         info.owner = q->owner;
1605         info.locked = q->locked;
1606         strlcpy(info.name, q->name, sizeof(info.name));
1607         queuefree(q);
1608 
1609         if (copy_to_user(arg, &info, sizeof(info)))
1610                 return -EFAULT;
1611 
1612         return 0;
1613 }
1614 
1615 /* SET_QUEUE_INFO ioctl() */
1616 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
1617                                         void __user *arg)
1618 {
1619         struct snd_seq_queue_info info;
1620         struct snd_seq_queue *q;
1621 
1622         if (copy_from_user(&info, arg, sizeof(info)))
1623                 return -EFAULT;
1624 
1625         if (info.owner != client->number)
1626                 return -EINVAL;
1627 
1628         /* change owner/locked permission */
1629         if (snd_seq_queue_check_access(info.queue, client->number)) {
1630                 if (snd_seq_queue_set_owner(info.queue, client->number, info.locked) < 0)
1631                         return -EPERM;
1632                 if (info.locked)
1633                         snd_seq_queue_use(info.queue, client->number, 1);
1634         } else {
1635                 return -EPERM;
1636         }       
1637 
1638         q = queueptr(info.queue);
1639         if (! q)
1640                 return -EINVAL;
1641         if (q->owner != client->number) {
1642                 queuefree(q);
1643                 return -EPERM;
1644         }
1645         strlcpy(q->name, info.name, sizeof(q->name));
1646         queuefree(q);
1647 
1648         return 0;
1649 }
1650 
1651 /* GET_NAMED_QUEUE ioctl() */
1652 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client, void __user *arg)
1653 {
1654         struct snd_seq_queue_info info;
1655         struct snd_seq_queue *q;
1656 
1657         if (copy_from_user(&info, arg, sizeof(info)))
1658                 return -EFAULT;
1659 
1660         q = snd_seq_queue_find_name(info.name);
1661         if (q == NULL)
1662                 return -EINVAL;
1663         info.queue = q->queue;
1664         info.owner = q->owner;
1665         info.locked = q->locked;
1666         queuefree(q);
1667 
1668         if (copy_to_user(arg, &info, sizeof(info)))
1669                 return -EFAULT;
1670 
1671         return 0;
1672 }
1673 
1674 /* GET_QUEUE_STATUS ioctl() */
1675 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
1676                                           void __user *arg)
1677 {
1678         struct snd_seq_queue_status status;
1679         struct snd_seq_queue *queue;
1680         struct snd_seq_timer *tmr;
1681 
1682         if (copy_from_user(&status, arg, sizeof(status)))
1683                 return -EFAULT;
1684 
1685         queue = queueptr(status.queue);
1686         if (queue == NULL)
1687                 return -EINVAL;
1688         memset(&status, 0, sizeof(status));
1689         status.queue = queue->queue;
1690         
1691         tmr = queue->timer;
1692         status.events = queue->tickq->cells + queue->timeq->cells;
1693 
1694         status.time = snd_seq_timer_get_cur_time(tmr);
1695         status.tick = snd_seq_timer_get_cur_tick(tmr);
1696 
1697         status.running = tmr->running;
1698 
1699         status.flags = queue->flags;
1700         queuefree(queue);
1701 
1702         if (copy_to_user(arg, &status, sizeof(status)))
1703                 return -EFAULT;
1704         return 0;
1705 }
1706 
1707 
1708 /* GET_QUEUE_TEMPO ioctl() */
1709 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
1710                                          void __user *arg)
1711 {
1712         struct snd_seq_queue_tempo tempo;
1713         struct snd_seq_queue *queue;
1714         struct snd_seq_timer *tmr;
1715 
1716         if (copy_from_user(&tempo, arg, sizeof(tempo)))
1717                 return -EFAULT;
1718 
1719         queue = queueptr(tempo.queue);
1720         if (queue == NULL)
1721                 return -EINVAL;
1722         memset(&tempo, 0, sizeof(tempo));
1723         tempo.queue = queue->queue;
1724         
1725         tmr = queue->timer;
1726 
1727         tempo.tempo = tmr->tempo;
1728         tempo.ppq = tmr->ppq;
1729         tempo.skew_value = tmr->skew;
1730         tempo.skew_base = tmr->skew_base;
1731         queuefree(queue);
1732 
1733         if (copy_to_user(arg, &tempo, sizeof(tempo)))
1734                 return -EFAULT;
1735         return 0;
1736 }
1737 
1738 
1739 /* SET_QUEUE_TEMPO ioctl() */
1740 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1741 {
1742         if (!snd_seq_queue_check_access(tempo->queue, client))
1743                 return -EPERM;
1744         return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1745 }
1746 
1747 EXPORT_SYMBOL(snd_seq_set_queue_tempo);
1748 
1749 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
1750                                          void __user *arg)
1751 {
1752         int result;
1753         struct snd_seq_queue_tempo tempo;
1754 
1755         if (copy_from_user(&tempo, arg, sizeof(tempo)))
1756                 return -EFAULT;
1757 
1758         result = snd_seq_set_queue_tempo(client->number, &tempo);
1759         return result < 0 ? result : 0;
1760 }
1761 
1762 
1763 /* GET_QUEUE_TIMER ioctl() */
1764 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
1765                                          void __user *arg)
1766 {
1767         struct snd_seq_queue_timer timer;
1768         struct snd_seq_queue *queue;
1769         struct snd_seq_timer *tmr;
1770 
1771         if (copy_from_user(&timer, arg, sizeof(timer)))
1772                 return -EFAULT;
1773 
1774         queue = queueptr(timer.queue);
1775         if (queue == NULL)
1776                 return -EINVAL;
1777 
1778         if (mutex_lock_interruptible(&queue->timer_mutex)) {
1779                 queuefree(queue);
1780                 return -ERESTARTSYS;
1781         }
1782         tmr = queue->timer;
1783         memset(&timer, 0, sizeof(timer));
1784         timer.queue = queue->queue;
1785 
1786         timer.type = tmr->type;
1787         if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1788                 timer.u.alsa.id = tmr->alsa_id;
1789                 timer.u.alsa.resolution = tmr->preferred_resolution;
1790         }
1791         mutex_unlock(&queue->timer_mutex);
1792         queuefree(queue);
1793         
1794         if (copy_to_user(arg, &timer, sizeof(timer)))
1795                 return -EFAULT;
1796         return 0;
1797 }
1798 
1799 
1800 /* SET_QUEUE_TIMER ioctl() */
1801 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
1802                                          void __user *arg)
1803 {
1804         int result = 0;
1805         struct snd_seq_queue_timer timer;
1806 
1807         if (copy_from_user(&timer, arg, sizeof(timer)))
1808                 return -EFAULT;
1809 
1810         if (timer.type != SNDRV_SEQ_TIMER_ALSA)
1811                 return -EINVAL;
1812 
1813         if (snd_seq_queue_check_access(timer.queue, client->number)) {
1814                 struct snd_seq_queue *q;
1815                 struct snd_seq_timer *tmr;
1816 
1817                 q = queueptr(timer.queue);
1818                 if (q == NULL)
1819                         return -ENXIO;
1820                 if (mutex_lock_interruptible(&q->timer_mutex)) {
1821                         queuefree(q);
1822                         return -ERESTARTSYS;
1823                 }
1824                 tmr = q->timer;
1825                 snd_seq_queue_timer_close(timer.queue);
1826                 tmr->type = timer.type;
1827                 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1828                         tmr->alsa_id = timer.u.alsa.id;
1829                         tmr->preferred_resolution = timer.u.alsa.resolution;
1830                 }
1831                 result = snd_seq_queue_timer_open(timer.queue);
1832                 mutex_unlock(&q->timer_mutex);
1833                 queuefree(q);
1834         } else {
1835                 return -EPERM;
1836         }       
1837 
1838         return result;
1839 }
1840 
1841 
1842 /* GET_QUEUE_CLIENT ioctl() */
1843 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
1844                                           void __user *arg)
1845 {
1846         struct snd_seq_queue_client info;
1847         int used;
1848 
1849         if (copy_from_user(&info, arg, sizeof(info)))
1850                 return -EFAULT;
1851 
1852         used = snd_seq_queue_is_used(info.queue, client->number);
1853         if (used < 0)
1854                 return -EINVAL;
1855         info.used = used;
1856         info.client = client->number;
1857 
1858         if (copy_to_user(arg, &info, sizeof(info)))
1859                 return -EFAULT;
1860         return 0;
1861 }
1862 
1863 
1864 /* SET_QUEUE_CLIENT ioctl() */
1865 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
1866                                           void __user *arg)
1867 {
1868         int err;
1869         struct snd_seq_queue_client info;
1870 
1871         if (copy_from_user(&info, arg, sizeof(info)))
1872                 return -EFAULT;
1873 
1874         if (info.used >= 0) {
1875                 err = snd_seq_queue_use(info.queue, client->number, info.used);
1876                 if (err < 0)
1877                         return err;
1878         }
1879 
1880         return snd_seq_ioctl_get_queue_client(client, arg);
1881 }
1882 
1883 
1884 /* GET_CLIENT_POOL ioctl() */
1885 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
1886                                          void __user *arg)
1887 {
1888         struct snd_seq_client_pool info;
1889         struct snd_seq_client *cptr;
1890 
1891         if (copy_from_user(&info, arg, sizeof(info)))
1892                 return -EFAULT;
1893 
1894         cptr = snd_seq_client_use_ptr(info.client);
1895         if (cptr == NULL)
1896                 return -ENOENT;
1897         memset(&info, 0, sizeof(info));
1898         info.client = cptr->number;
1899         info.output_pool = cptr->pool->size;
1900         info.output_room = cptr->pool->room;
1901         info.output_free = info.output_pool;
1902         info.output_free = snd_seq_unused_cells(cptr->pool);
1903         if (cptr->type == USER_CLIENT) {
1904                 info.input_pool = cptr->data.user.fifo_pool_size;
1905                 info.input_free = info.input_pool;
1906                 if (cptr->data.user.fifo)
1907                         info.input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool);
1908         } else {
1909                 info.input_pool = 0;
1910                 info.input_free = 0;
1911         }
1912         snd_seq_client_unlock(cptr);
1913         
1914         if (copy_to_user(arg, &info, sizeof(info)))
1915                 return -EFAULT;
1916         return 0;
1917 }
1918 
1919 /* SET_CLIENT_POOL ioctl() */
1920 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
1921                                          void __user *arg)
1922 {
1923         struct snd_seq_client_pool info;
1924         int rc;
1925 
1926         if (copy_from_user(&info, arg, sizeof(info)))
1927                 return -EFAULT;
1928 
1929         if (client->number != info.client)
1930                 return -EINVAL; /* can't change other clients */
1931 
1932         if (info.output_pool >= 1 && info.output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1933             (! snd_seq_write_pool_allocated(client) ||
1934              info.output_pool != client->pool->size)) {
1935                 if (snd_seq_write_pool_allocated(client)) {
1936                         /* remove all existing cells */
1937                         snd_seq_queue_client_leave_cells(client->number);
1938                         snd_seq_pool_done(client->pool);
1939                 }
1940                 client->pool->size = info.output_pool;
1941                 rc = snd_seq_pool_init(client->pool);
1942                 if (rc < 0)
1943                         return rc;
1944         }
1945         if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
1946             info.input_pool >= 1 &&
1947             info.input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1948             info.input_pool != client->data.user.fifo_pool_size) {
1949                 /* change pool size */
1950                 rc = snd_seq_fifo_resize(client->data.user.fifo, info.input_pool);
1951                 if (rc < 0)
1952                         return rc;
1953                 client->data.user.fifo_pool_size = info.input_pool;
1954         }
1955         if (info.output_room >= 1 &&
1956             info.output_room <= client->pool->size) {
1957                 client->pool->room  = info.output_room;
1958         }
1959 
1960         return snd_seq_ioctl_get_client_pool(client, arg);
1961 }
1962 
1963 
1964 /* REMOVE_EVENTS ioctl() */
1965 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
1966                                        void __user *arg)
1967 {
1968         struct snd_seq_remove_events info;
1969 
1970         if (copy_from_user(&info, arg, sizeof(info)))
1971                 return -EFAULT;
1972 
1973         /*
1974          * Input mostly not implemented XXX.
1975          */
1976         if (info.remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1977                 /*
1978                  * No restrictions so for a user client we can clear
1979                  * the whole fifo
1980                  */
1981                 if (client->type == USER_CLIENT && client->data.user.fifo)
1982                         snd_seq_fifo_clear(client->data.user.fifo);
1983         }
1984 
1985         if (info.remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1986                 snd_seq_queue_remove_cells(client->number, &info);
1987 
1988         return 0;
1989 }
1990 
1991 
1992 /*
1993  * get subscription info
1994  */
1995 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
1996                                           void __user *arg)
1997 {
1998         int result;
1999         struct snd_seq_client *sender = NULL;
2000         struct snd_seq_client_port *sport = NULL;
2001         struct snd_seq_port_subscribe subs;
2002         struct snd_seq_subscribers *p;
2003 
2004         if (copy_from_user(&subs, arg, sizeof(subs)))
2005                 return -EFAULT;
2006 
2007         result = -EINVAL;
2008         if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
2009                 goto __end;
2010         if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
2011                 goto __end;
2012         p = snd_seq_port_get_subscription(&sport->c_src, &subs.dest);
2013         if (p) {
2014                 result = 0;
2015                 subs = p->info;
2016         } else
2017                 result = -ENOENT;
2018 
2019       __end:
2020         if (sport)
2021                 snd_seq_port_unlock(sport);
2022         if (sender)
2023                 snd_seq_client_unlock(sender);
2024         if (result >= 0) {
2025                 if (copy_to_user(arg, &subs, sizeof(subs)))
2026                         return -EFAULT;
2027         }
2028         return result;
2029 }
2030 
2031 
2032 /*
2033  * get subscription info - check only its presence
2034  */
2035 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client,
2036                                     void __user *arg)
2037 {
2038         int result = -ENXIO;
2039         struct snd_seq_client *cptr = NULL;
2040         struct snd_seq_client_port *port = NULL;
2041         struct snd_seq_query_subs subs;
2042         struct snd_seq_port_subs_info *group;
2043         struct list_head *p;
2044         int i;
2045 
2046         if (copy_from_user(&subs, arg, sizeof(subs)))
2047                 return -EFAULT;
2048 
2049         if ((cptr = snd_seq_client_use_ptr(subs.root.client)) == NULL)
2050                 goto __end;
2051         if ((port = snd_seq_port_use_ptr(cptr, subs.root.port)) == NULL)
2052                 goto __end;
2053 
2054         switch (subs.type) {
2055         case SNDRV_SEQ_QUERY_SUBS_READ:
2056                 group = &port->c_src;
2057                 break;
2058         case SNDRV_SEQ_QUERY_SUBS_WRITE:
2059                 group = &port->c_dest;
2060                 break;
2061         default:
2062                 goto __end;
2063         }
2064 
2065         down_read(&group->list_mutex);
2066         /* search for the subscriber */
2067         subs.num_subs = group->count;
2068         i = 0;
2069         result = -ENOENT;
2070         list_for_each(p, &group->list_head) {
2071                 if (i++ == subs.index) {
2072                         /* found! */
2073                         struct snd_seq_subscribers *s;
2074                         if (subs.type == SNDRV_SEQ_QUERY_SUBS_READ) {
2075                                 s = list_entry(p, struct snd_seq_subscribers, src_list);
2076                                 subs.addr = s->info.dest;
2077                         } else {
2078                                 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2079                                 subs.addr = s->info.sender;
2080                         }
2081                         subs.flags = s->info.flags;
2082                         subs.queue = s->info.queue;
2083                         result = 0;
2084                         break;
2085                 }
2086         }
2087         up_read(&group->list_mutex);
2088 
2089       __end:
2090         if (port)
2091                 snd_seq_port_unlock(port);
2092         if (cptr)
2093                 snd_seq_client_unlock(cptr);
2094         if (result >= 0) {
2095                 if (copy_to_user(arg, &subs, sizeof(subs)))
2096                         return -EFAULT;
2097         }
2098         return result;
2099 }
2100 
2101 
2102 /*
2103  * query next client
2104  */
2105 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
2106                                            void __user *arg)
2107 {
2108         struct snd_seq_client *cptr = NULL;
2109         struct snd_seq_client_info info;
2110 
2111         if (copy_from_user(&info, arg, sizeof(info)))
2112                 return -EFAULT;
2113 
2114         /* search for next client */
2115         info.client++;
2116         if (info.client < 0)
2117                 info.client = 0;
2118         for (; info.client < SNDRV_SEQ_MAX_CLIENTS; info.client++) {
2119                 cptr = snd_seq_client_use_ptr(info.client);
2120                 if (cptr)
2121                         break; /* found */
2122         }
2123         if (cptr == NULL)
2124                 return -ENOENT;
2125 
2126         get_client_info(cptr, &info);
2127         snd_seq_client_unlock(cptr);
2128 
2129         if (copy_to_user(arg, &info, sizeof(info)))
2130                 return -EFAULT;
2131         return 0;
2132 }
2133 
2134 /* 
2135  * query next port
2136  */
2137 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
2138                                          void __user *arg)
2139 {
2140         struct snd_seq_client *cptr;
2141         struct snd_seq_client_port *port = NULL;
2142         struct snd_seq_port_info info;
2143 
2144         if (copy_from_user(&info, arg, sizeof(info)))
2145                 return -EFAULT;
2146         cptr = snd_seq_client_use_ptr(info.addr.client);
2147         if (cptr == NULL)
2148                 return -ENXIO;
2149 
2150         /* search for next port */
2151         info.addr.port++;
2152         port = snd_seq_port_query_nearest(cptr, &info);
2153         if (port == NULL) {
2154                 snd_seq_client_unlock(cptr);
2155                 return -ENOENT;
2156         }
2157 
2158         /* get port info */
2159         info.addr = port->addr;
2160         snd_seq_get_port_info(port, &info);
2161         snd_seq_port_unlock(port);
2162         snd_seq_client_unlock(cptr);
2163 
2164         if (copy_to_user(arg, &info, sizeof(info)))
2165                 return -EFAULT;
2166         return 0;
2167 }
2168 
2169 /* -------------------------------------------------------- */
2170 
2171 static struct seq_ioctl_table {
2172         unsigned int cmd;
2173         int (*func)(struct snd_seq_client *client, void __user * arg);
2174 } ioctl_tables[] = {
2175         { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2176         { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2177         { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2178         { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2179         { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2180         { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2181         { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2182         { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2183         { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2184         { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2185         { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2186         { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2187         { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2188         { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2189         { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2190         { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2191         { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2192         { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2193         { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2194         { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2195         { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2196         { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2197         { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2198         { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2199         { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2200         { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2201         { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2202         { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2203         { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2204         { 0, NULL },
2205 };
2206 
2207 static int snd_seq_do_ioctl(struct snd_seq_client *client, unsigned int cmd,
2208                             void __user *arg)
2209 {
2210         struct seq_ioctl_table *p;
2211 
2212         switch (cmd) {
2213         case SNDRV_SEQ_IOCTL_PVERSION:
2214                 /* return sequencer version number */
2215                 return put_user(SNDRV_SEQ_VERSION, (int __user *)arg) ? -EFAULT : 0;
2216         case SNDRV_SEQ_IOCTL_CLIENT_ID:
2217                 /* return the id of this client */
2218                 return put_user(client->number, (int __user *)arg) ? -EFAULT : 0;
2219         }
2220 
2221         if (! arg)
2222                 return -EFAULT;
2223         for (p = ioctl_tables; p->cmd; p++) {
2224                 if (p->cmd == cmd)
2225                         return p->func(client, arg);
2226         }
2227         pr_debug("ALSA: seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n",
2228                    cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2229         return -ENOTTY;
2230 }
2231 
2232 
2233 static long snd_seq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2234 {
2235         struct snd_seq_client *client = file->private_data;
2236 
2237         if (snd_BUG_ON(!client))
2238                 return -ENXIO;
2239                 
2240         return snd_seq_do_ioctl(client, cmd, (void __user *) arg);
2241 }
2242 
2243 #ifdef CONFIG_COMPAT
2244 #include "seq_compat.c"
2245 #else
2246 #define snd_seq_ioctl_compat    NULL
2247 #endif
2248 
2249 /* -------------------------------------------------------- */
2250 
2251 
2252 /* exported to kernel modules */
2253 int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
2254                                  const char *name_fmt, ...)
2255 {
2256         struct snd_seq_client *client;
2257         va_list args;
2258 
2259         if (snd_BUG_ON(in_interrupt()))
2260                 return -EBUSY;
2261 
2262         if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD)
2263                 return -EINVAL;
2264         if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
2265                 return -EINVAL;
2266 
2267         if (mutex_lock_interruptible(&register_mutex))
2268                 return -ERESTARTSYS;
2269 
2270         if (card) {
2271                 client_index += SNDRV_SEQ_GLOBAL_CLIENTS
2272                         + card->number * SNDRV_SEQ_CLIENTS_PER_CARD;
2273                 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN)
2274                         client_index = -1;
2275         }
2276 
2277         /* empty write queue as default */
2278         client = seq_create_client1(client_index, 0);
2279         if (client == NULL) {
2280                 mutex_unlock(&register_mutex);
2281                 return -EBUSY;  /* failure code */
2282         }
2283         usage_alloc(&client_usage, 1);
2284 
2285         client->accept_input = 1;
2286         client->accept_output = 1;
2287         client->data.kernel.card = card;
2288                 
2289         va_start(args, name_fmt);
2290         vsnprintf(client->name, sizeof(client->name), name_fmt, args);
2291         va_end(args);
2292 
2293         client->type = KERNEL_CLIENT;
2294         mutex_unlock(&register_mutex);
2295 
2296         /* make others aware this new client */
2297         snd_seq_system_client_ev_client_start(client->number);
2298         
2299         /* return client number to caller */
2300         return client->number;
2301 }
2302 
2303 EXPORT_SYMBOL(snd_seq_create_kernel_client);
2304 
2305 /* exported to kernel modules */
2306 int snd_seq_delete_kernel_client(int client)
2307 {
2308         struct snd_seq_client *ptr;
2309 
2310         if (snd_BUG_ON(in_interrupt()))
2311                 return -EBUSY;
2312 
2313         ptr = clientptr(client);
2314         if (ptr == NULL)
2315                 return -EINVAL;
2316 
2317         seq_free_client(ptr);
2318         kfree(ptr);
2319         return 0;
2320 }
2321 
2322 EXPORT_SYMBOL(snd_seq_delete_kernel_client);
2323 
2324 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue
2325  * and snd_seq_kernel_client_enqueue_blocking
2326  */
2327 static int kernel_client_enqueue(int client, struct snd_seq_event *ev,
2328                                  struct file *file, int blocking,
2329                                  int atomic, int hop)
2330 {
2331         struct snd_seq_client *cptr;
2332         int result;
2333 
2334         if (snd_BUG_ON(!ev))
2335                 return -EINVAL;
2336 
2337         if (ev->type == SNDRV_SEQ_EVENT_NONE)
2338                 return 0; /* ignore this */
2339         if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2340                 return -EINVAL; /* quoted events can't be enqueued */
2341 
2342         /* fill in client number */
2343         ev->source.client = client;
2344 
2345         if (check_event_type_and_length(ev))
2346                 return -EINVAL;
2347 
2348         cptr = snd_seq_client_use_ptr(client);
2349         if (cptr == NULL)
2350                 return -EINVAL;
2351         
2352         if (! cptr->accept_output)
2353                 result = -EPERM;
2354         else /* send it */
2355                 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, atomic, hop);
2356 
2357         snd_seq_client_unlock(cptr);
2358         return result;
2359 }
2360 
2361 /*
2362  * exported, called by kernel clients to enqueue events (w/o blocking)
2363  *
2364  * RETURN VALUE: zero if succeed, negative if error
2365  */
2366 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev,
2367                                   int atomic, int hop)
2368 {
2369         return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop);
2370 }
2371 
2372 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
2373 
2374 /*
2375  * exported, called by kernel clients to enqueue events (with blocking)
2376  *
2377  * RETURN VALUE: zero if succeed, negative if error
2378  */
2379 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev,
2380                                            struct file *file,
2381                                            int atomic, int hop)
2382 {
2383         return kernel_client_enqueue(client, ev, file, 1, atomic, hop);
2384 }
2385 
2386 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking);
2387 
2388 /* 
2389  * exported, called by kernel clients to dispatch events directly to other
2390  * clients, bypassing the queues.  Event time-stamp will be updated.
2391  *
2392  * RETURN VALUE: negative = delivery failed,
2393  *               zero, or positive: the number of delivered events
2394  */
2395 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev,
2396                                    int atomic, int hop)
2397 {
2398         struct snd_seq_client *cptr;
2399         int result;
2400 
2401         if (snd_BUG_ON(!ev))
2402                 return -EINVAL;
2403 
2404         /* fill in client number */
2405         ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2406         ev->source.client = client;
2407 
2408         if (check_event_type_and_length(ev))
2409                 return -EINVAL;
2410 
2411         cptr = snd_seq_client_use_ptr(client);
2412         if (cptr == NULL)
2413                 return -EINVAL;
2414 
2415         if (!cptr->accept_output)
2416                 result = -EPERM;
2417         else
2418                 result = snd_seq_deliver_event(cptr, ev, atomic, hop);
2419 
2420         snd_seq_client_unlock(cptr);
2421         return result;
2422 }
2423 
2424 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch);
2425 
2426 /*
2427  * exported, called by kernel clients to perform same functions as with
2428  * userland ioctl() 
2429  */
2430 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2431 {
2432         struct snd_seq_client *client;
2433         mm_segment_t fs;
2434         int result;
2435 
2436         client = clientptr(clientid);
2437         if (client == NULL)
2438                 return -ENXIO;
2439         fs = snd_enter_user();
2440         result = snd_seq_do_ioctl(client, cmd, (void __force __user *)arg);
2441         snd_leave_user(fs);
2442         return result;
2443 }
2444 
2445 EXPORT_SYMBOL(snd_seq_kernel_client_ctl);
2446 
2447 /* exported (for OSS emulator) */
2448 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2449 {
2450         struct snd_seq_client *client;
2451 
2452         client = clientptr(clientid);
2453         if (client == NULL)
2454                 return -ENXIO;
2455 
2456         if (! snd_seq_write_pool_allocated(client))
2457                 return 1;
2458         if (snd_seq_pool_poll_wait(client->pool, file, wait))
2459                 return 1;
2460         return 0;
2461 }
2462 
2463 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll);
2464 
2465 /*---------------------------------------------------------------------------*/
2466 
2467 #ifdef CONFIG_SND_PROC_FS
2468 /*
2469  *  /proc interface
2470  */
2471 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer,
2472                                           struct snd_seq_port_subs_info *group,
2473                                           int is_src, char *msg)
2474 {
2475         struct list_head *p;
2476         struct snd_seq_subscribers *s;
2477         int count = 0;
2478 
2479         down_read(&group->list_mutex);
2480         if (list_empty(&group->list_head)) {
2481                 up_read(&group->list_mutex);
2482                 return;
2483         }
2484         snd_iprintf(buffer, msg);
2485         list_for_each(p, &group->list_head) {
2486                 if (is_src)
2487                         s = list_entry(p, struct snd_seq_subscribers, src_list);
2488                 else
2489                         s = list_entry(p, struct snd_seq_subscribers, dest_list);
2490                 if (count++)
2491                         snd_iprintf(buffer, ", ");
2492                 snd_iprintf(buffer, "%d:%d",
2493                             is_src ? s->info.dest.client : s->info.sender.client,
2494                             is_src ? s->info.dest.port : s->info.sender.port);
2495                 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
2496                         snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
2497                 if (group->exclusive)
2498                         snd_iprintf(buffer, "[ex]");
2499         }
2500         up_read(&group->list_mutex);
2501         snd_iprintf(buffer, "\n");
2502 }
2503 
2504 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
2505 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
2506 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
2507 
2508 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2509 
2510 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
2511                                     struct snd_seq_client *client)
2512 {
2513         struct snd_seq_client_port *p;
2514 
2515         mutex_lock(&client->ports_mutex);
2516         list_for_each_entry(p, &client->ports_list_head, list) {
2517                 snd_iprintf(buffer, "  Port %3d : \"%s\" (%c%c%c%c)\n",
2518                             p->addr.port, p->name,
2519                             FLAG_PERM_RD(p->capability),
2520                             FLAG_PERM_WR(p->capability),
2521                             FLAG_PERM_EX(p->capability),
2522                             FLAG_PERM_DUPLEX(p->capability));
2523                 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, "    Connecting To: ");
2524                 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, "    Connected From: ");
2525         }
2526         mutex_unlock(&client->ports_mutex);
2527 }
2528 
2529 
2530 /* exported to seq_info.c */
2531 void snd_seq_info_clients_read(struct snd_info_entry *entry, 
2532                                struct snd_info_buffer *buffer)
2533 {
2534         int c;
2535         struct snd_seq_client *client;
2536 
2537         snd_iprintf(buffer, "Client info\n");
2538         snd_iprintf(buffer, "  cur  clients : %d\n", client_usage.cur);
2539         snd_iprintf(buffer, "  peak clients : %d\n", client_usage.peak);
2540         snd_iprintf(buffer, "  max  clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
2541         snd_iprintf(buffer, "\n");
2542 
2543         /* list the client table */
2544         for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2545                 client = snd_seq_client_use_ptr(c);
2546                 if (client == NULL)
2547                         continue;
2548                 if (client->type == NO_CLIENT) {
2549                         snd_seq_client_unlock(client);
2550                         continue;
2551                 }
2552 
2553                 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n",
2554                             c, client->name,
2555                             client->type == USER_CLIENT ? "User" : "Kernel");
2556                 snd_seq_info_dump_ports(buffer, client);
2557                 if (snd_seq_write_pool_allocated(client)) {
2558                         snd_iprintf(buffer, "  Output pool :\n");
2559                         snd_seq_info_pool(buffer, client->pool, "    ");
2560                 }
2561                 if (client->type == USER_CLIENT && client->data.user.fifo &&
2562                     client->data.user.fifo->pool) {
2563                         snd_iprintf(buffer, "  Input pool :\n");
2564                         snd_seq_info_pool(buffer, client->data.user.fifo->pool, "    ");
2565                 }
2566                 snd_seq_client_unlock(client);
2567         }
2568 }
2569 #endif /* CONFIG_SND_PROC_FS */
2570 
2571 /*---------------------------------------------------------------------------*/
2572 
2573 
2574 /*
2575  *  REGISTRATION PART
2576  */
2577 
2578 static const struct file_operations snd_seq_f_ops =
2579 {
2580         .owner =        THIS_MODULE,
2581         .read =         snd_seq_read,
2582         .write =        snd_seq_write,
2583         .open =         snd_seq_open,
2584         .release =      snd_seq_release,
2585         .llseek =       no_llseek,
2586         .poll =         snd_seq_poll,
2587         .unlocked_ioctl =       snd_seq_ioctl,
2588         .compat_ioctl = snd_seq_ioctl_compat,
2589 };
2590 
2591 static struct device seq_dev;
2592 
2593 /* 
2594  * register sequencer device 
2595  */
2596 int __init snd_sequencer_device_init(void)
2597 {
2598         int err;
2599 
2600         snd_device_initialize(&seq_dev, NULL);
2601         dev_set_name(&seq_dev, "seq");
2602 
2603         if (mutex_lock_interruptible(&register_mutex))
2604                 return -ERESTARTSYS;
2605 
2606         err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
2607                                   &snd_seq_f_ops, NULL, &seq_dev);
2608         if (err < 0) {
2609                 mutex_unlock(&register_mutex);
2610                 put_device(&seq_dev);
2611                 return err;
2612         }
2613         
2614         mutex_unlock(&register_mutex);
2615 
2616         return 0;
2617 }
2618 
2619 
2620 
2621 /* 
2622  * unregister sequencer device 
2623  */
2624 void __exit snd_sequencer_device_done(void)
2625 {
2626         snd_unregister_device(&seq_dev);
2627         put_device(&seq_dev);
2628 }
2629 

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