~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/sound/core/seq/seq_clientmgr.c

Version: ~ [ linux-5.8-rc4 ] ~ [ linux-5.7.7 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.50 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.131 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.187 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.229 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.229 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 
368         /* make others aware this new client */
369         snd_seq_system_client_ev_client_start(c);
370 
371         return 0;
372 }
373 
374 /* delete a user client */
375 static int snd_seq_release(struct inode *inode, struct file *file)
376 {
377         struct snd_seq_client *client = file->private_data;
378 
379         if (client) {
380                 seq_free_client(client);
381                 if (client->data.user.fifo)
382                         snd_seq_fifo_delete(&client->data.user.fifo);
383                 kfree(client);
384         }
385 
386         return 0;
387 }
388 
389 
390 /* handle client read() */
391 /* possible error values:
392  *      -ENXIO  invalid client or file open mode
393  *      -ENOSPC FIFO overflow (the flag is cleared after this error report)
394  *      -EINVAL no enough user-space buffer to write the whole event
395  *      -EFAULT seg. fault during copy to user space
396  */
397 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count,
398                             loff_t *offset)
399 {
400         struct snd_seq_client *client = file->private_data;
401         struct snd_seq_fifo *fifo;
402         int err;
403         long result = 0;
404         struct snd_seq_event_cell *cell;
405 
406         if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT))
407                 return -ENXIO;
408 
409         if (!access_ok(VERIFY_WRITE, buf, count))
410                 return -EFAULT;
411 
412         /* check client structures are in place */
413         if (snd_BUG_ON(!client))
414                 return -ENXIO;
415 
416         if (!client->accept_input || (fifo = client->data.user.fifo) == NULL)
417                 return -ENXIO;
418 
419         if (atomic_read(&fifo->overflow) > 0) {
420                 /* buffer overflow is detected */
421                 snd_seq_fifo_clear(fifo);
422                 /* return error code */
423                 return -ENOSPC;
424         }
425 
426         cell = NULL;
427         err = 0;
428         snd_seq_fifo_lock(fifo);
429 
430         /* while data available in queue */
431         while (count >= sizeof(struct snd_seq_event)) {
432                 int nonblock;
433 
434                 nonblock = (file->f_flags & O_NONBLOCK) || result > 0;
435                 if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) {
436                         break;
437                 }
438                 if (snd_seq_ev_is_variable(&cell->event)) {
439                         struct snd_seq_event tmpev;
440                         tmpev = cell->event;
441                         tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
442                         if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) {
443                                 err = -EFAULT;
444                                 break;
445                         }
446                         count -= sizeof(struct snd_seq_event);
447                         buf += sizeof(struct snd_seq_event);
448                         err = snd_seq_expand_var_event(&cell->event, count,
449                                                        (char __force *)buf, 0,
450                                                        sizeof(struct snd_seq_event));
451                         if (err < 0)
452                                 break;
453                         result += err;
454                         count -= err;
455                         buf += err;
456                 } else {
457                         if (copy_to_user(buf, &cell->event, sizeof(struct snd_seq_event))) {
458                                 err = -EFAULT;
459                                 break;
460                         }
461                         count -= sizeof(struct snd_seq_event);
462                         buf += sizeof(struct snd_seq_event);
463                 }
464                 snd_seq_cell_free(cell);
465                 cell = NULL; /* to be sure */
466                 result += sizeof(struct snd_seq_event);
467         }
468 
469         if (err < 0) {
470                 if (cell)
471                         snd_seq_fifo_cell_putback(fifo, cell);
472                 if (err == -EAGAIN && result > 0)
473                         err = 0;
474         }
475         snd_seq_fifo_unlock(fifo);
476 
477         return (err < 0) ? err : result;
478 }
479 
480 
481 /*
482  * check access permission to the port
483  */
484 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags)
485 {
486         if ((port->capability & flags) != flags)
487                 return 0;
488         return flags;
489 }
490 
491 /*
492  * check if the destination client is available, and return the pointer
493  * if filter is non-zero, client filter bitmap is tested.
494  */
495 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event,
496                                                     int filter)
497 {
498         struct snd_seq_client *dest;
499 
500         dest = snd_seq_client_use_ptr(event->dest.client);
501         if (dest == NULL)
502                 return NULL;
503         if (! dest->accept_input)
504                 goto __not_avail;
505         if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) &&
506             ! test_bit(event->type, dest->event_filter))
507                 goto __not_avail;
508         if (filter && !(dest->filter & filter))
509                 goto __not_avail;
510 
511         return dest; /* ok - accessible */
512 __not_avail:
513         snd_seq_client_unlock(dest);
514         return NULL;
515 }
516 
517 
518 /*
519  * Return the error event.
520  *
521  * If the receiver client is a user client, the original event is
522  * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event.  If
523  * the original event is also variable length, the external data is
524  * copied after the event record. 
525  * If the receiver client is a kernel client, the original event is
526  * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra
527  * kmalloc.
528  */
529 static int bounce_error_event(struct snd_seq_client *client,
530                               struct snd_seq_event *event,
531                               int err, int atomic, int hop)
532 {
533         struct snd_seq_event bounce_ev;
534         int result;
535 
536         if (client == NULL ||
537             ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) ||
538             ! client->accept_input)
539                 return 0; /* ignored */
540 
541         /* set up quoted error */
542         memset(&bounce_ev, 0, sizeof(bounce_ev));
543         bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR;
544         bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED;
545         bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT;
546         bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
547         bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
548         bounce_ev.dest.client = client->number;
549         bounce_ev.dest.port = event->source.port;
550         bounce_ev.data.quote.origin = event->dest;
551         bounce_ev.data.quote.event = event;
552         bounce_ev.data.quote.value = -err; /* use positive value */
553         result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1);
554         if (result < 0) {
555                 client->event_lost++;
556                 return result;
557         }
558 
559         return result;
560 }
561 
562 
563 /*
564  * rewrite the time-stamp of the event record with the curren time
565  * of the given queue.
566  * return non-zero if updated.
567  */
568 static int update_timestamp_of_queue(struct snd_seq_event *event,
569                                      int queue, int real_time)
570 {
571         struct snd_seq_queue *q;
572 
573         q = queueptr(queue);
574         if (! q)
575                 return 0;
576         event->queue = queue;
577         event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK;
578         if (real_time) {
579                 event->time.time = snd_seq_timer_get_cur_time(q->timer);
580                 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL;
581         } else {
582                 event->time.tick = snd_seq_timer_get_cur_tick(q->timer);
583                 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK;
584         }
585         queuefree(q);
586         return 1;
587 }
588 
589 
590 /*
591  * deliver an event to the specified destination.
592  * if filter is non-zero, client filter bitmap is tested.
593  *
594  *  RETURN VALUE: 0 : if succeeded
595  *               <0 : error
596  */
597 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
598                                         struct snd_seq_event *event,
599                                         int filter, int atomic, int hop)
600 {
601         struct snd_seq_client *dest = NULL;
602         struct snd_seq_client_port *dest_port = NULL;
603         int result = -ENOENT;
604         int direct;
605 
606         direct = snd_seq_ev_is_direct(event);
607 
608         dest = get_event_dest_client(event, filter);
609         if (dest == NULL)
610                 goto __skip;
611         dest_port = snd_seq_port_use_ptr(dest, event->dest.port);
612         if (dest_port == NULL)
613                 goto __skip;
614 
615         /* check permission */
616         if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) {
617                 result = -EPERM;
618                 goto __skip;
619         }
620                 
621         if (dest_port->timestamping)
622                 update_timestamp_of_queue(event, dest_port->time_queue,
623                                           dest_port->time_real);
624 
625         switch (dest->type) {
626         case USER_CLIENT:
627                 if (dest->data.user.fifo)
628                         result = snd_seq_fifo_event_in(dest->data.user.fifo, event);
629                 break;
630 
631         case KERNEL_CLIENT:
632                 if (dest_port->event_input == NULL)
633                         break;
634                 result = dest_port->event_input(event, direct,
635                                                 dest_port->private_data,
636                                                 atomic, hop);
637                 break;
638         default:
639                 break;
640         }
641 
642   __skip:
643         if (dest_port)
644                 snd_seq_port_unlock(dest_port);
645         if (dest)
646                 snd_seq_client_unlock(dest);
647 
648         if (result < 0 && !direct) {
649                 result = bounce_error_event(client, event, result, atomic, hop);
650         }
651         return result;
652 }
653 
654 
655 /*
656  * send the event to all subscribers:
657  */
658 static int deliver_to_subscribers(struct snd_seq_client *client,
659                                   struct snd_seq_event *event,
660                                   int atomic, int hop)
661 {
662         struct snd_seq_subscribers *subs;
663         int err, result = 0, num_ev = 0;
664         struct snd_seq_event event_saved;
665         struct snd_seq_client_port *src_port;
666         struct snd_seq_port_subs_info *grp;
667 
668         src_port = snd_seq_port_use_ptr(client, event->source.port);
669         if (src_port == NULL)
670                 return -EINVAL; /* invalid source port */
671         /* save original event record */
672         event_saved = *event;
673         grp = &src_port->c_src;
674         
675         /* lock list */
676         if (atomic)
677                 read_lock(&grp->list_lock);
678         else
679                 down_read(&grp->list_mutex);
680         list_for_each_entry(subs, &grp->list_head, src_list) {
681                 event->dest = subs->info.dest;
682                 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
683                         /* convert time according to flag with subscription */
684                         update_timestamp_of_queue(event, subs->info.queue,
685                                                   subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL);
686                 err = snd_seq_deliver_single_event(client, event,
687                                                    0, atomic, hop);
688                 if (err < 0) {
689                         /* save first error that occurs and continue */
690                         if (!result)
691                                 result = err;
692                         continue;
693                 }
694                 num_ev++;
695                 /* restore original event record */
696                 *event = event_saved;
697         }
698         if (atomic)
699                 read_unlock(&grp->list_lock);
700         else
701                 up_read(&grp->list_mutex);
702         *event = event_saved; /* restore */
703         snd_seq_port_unlock(src_port);
704         return (result < 0) ? result : num_ev;
705 }
706 
707 
708 #ifdef SUPPORT_BROADCAST 
709 /*
710  * broadcast to all ports:
711  */
712 static int port_broadcast_event(struct snd_seq_client *client,
713                                 struct snd_seq_event *event,
714                                 int atomic, int hop)
715 {
716         int num_ev = 0, err, result = 0;
717         struct snd_seq_client *dest_client;
718         struct snd_seq_client_port *port;
719 
720         dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST);
721         if (dest_client == NULL)
722                 return 0; /* no matching destination */
723 
724         read_lock(&dest_client->ports_lock);
725         list_for_each_entry(port, &dest_client->ports_list_head, list) {
726                 event->dest.port = port->addr.port;
727                 /* pass NULL as source client to avoid error bounce */
728                 err = snd_seq_deliver_single_event(NULL, event,
729                                                    SNDRV_SEQ_FILTER_BROADCAST,
730                                                    atomic, hop);
731                 if (err < 0) {
732                         /* save first error that occurs and continue */
733                         if (!result)
734                                 result = err;
735                         continue;
736                 }
737                 num_ev++;
738         }
739         read_unlock(&dest_client->ports_lock);
740         snd_seq_client_unlock(dest_client);
741         event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */
742         return (result < 0) ? result : num_ev;
743 }
744 
745 /*
746  * send the event to all clients:
747  * if destination port is also ADDRESS_BROADCAST, deliver to all ports.
748  */
749 static int broadcast_event(struct snd_seq_client *client,
750                            struct snd_seq_event *event, int atomic, int hop)
751 {
752         int err, result = 0, num_ev = 0;
753         int dest;
754         struct snd_seq_addr addr;
755 
756         addr = event->dest; /* save */
757 
758         for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) {
759                 /* don't send to itself */
760                 if (dest == client->number)
761                         continue;
762                 event->dest.client = dest;
763                 event->dest.port = addr.port;
764                 if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST)
765                         err = port_broadcast_event(client, event, atomic, hop);
766                 else
767                         /* pass NULL as source client to avoid error bounce */
768                         err = snd_seq_deliver_single_event(NULL, event,
769                                                            SNDRV_SEQ_FILTER_BROADCAST,
770                                                            atomic, hop);
771                 if (err < 0) {
772                         /* save first error that occurs and continue */
773                         if (!result)
774                                 result = err;
775                         continue;
776                 }
777                 num_ev += err;
778         }
779         event->dest = addr; /* restore */
780         return (result < 0) ? result : num_ev;
781 }
782 
783 
784 /* multicast - not supported yet */
785 static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event,
786                            int atomic, int hop)
787 {
788         pr_debug("ALSA: seq: multicast not supported yet.\n");
789         return 0; /* ignored */
790 }
791 #endif /* SUPPORT_BROADCAST */
792 
793 
794 /* deliver an event to the destination port(s).
795  * if the event is to subscribers or broadcast, the event is dispatched
796  * to multiple targets.
797  *
798  * RETURN VALUE: n > 0  : the number of delivered events.
799  *               n == 0 : the event was not passed to any client.
800  *               n < 0  : error - event was not processed.
801  */
802 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event,
803                                  int atomic, int hop)
804 {
805         int result;
806 
807         hop++;
808         if (hop >= SNDRV_SEQ_MAX_HOPS) {
809                 pr_debug("ALSA: seq: too long delivery path (%d:%d->%d:%d)\n",
810                            event->source.client, event->source.port,
811                            event->dest.client, event->dest.port);
812                 return -EMLINK;
813         }
814 
815         if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS ||
816             event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS)
817                 result = deliver_to_subscribers(client, event, atomic, hop);
818 #ifdef SUPPORT_BROADCAST
819         else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST ||
820                  event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST)
821                 result = broadcast_event(client, event, atomic, hop);
822         else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS)
823                 result = multicast_event(client, event, atomic, hop);
824         else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST)
825                 result = port_broadcast_event(client, event, atomic, hop);
826 #endif
827         else
828                 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop);
829 
830         return result;
831 }
832 
833 /*
834  * dispatch an event cell:
835  * This function is called only from queue check routines in timer
836  * interrupts or after enqueued.
837  * The event cell shall be released or re-queued in this function.
838  *
839  * RETURN VALUE: n > 0  : the number of delivered events.
840  *               n == 0 : the event was not passed to any client.
841  *               n < 0  : error - event was not processed.
842  */
843 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop)
844 {
845         struct snd_seq_client *client;
846         int result;
847 
848         if (snd_BUG_ON(!cell))
849                 return -EINVAL;
850 
851         client = snd_seq_client_use_ptr(cell->event.source.client);
852         if (client == NULL) {
853                 snd_seq_cell_free(cell); /* release this cell */
854                 return -EINVAL;
855         }
856 
857         if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) {
858                 /* NOTE event:
859                  * the event cell is re-used as a NOTE-OFF event and
860                  * enqueued again.
861                  */
862                 struct snd_seq_event tmpev, *ev;
863 
864                 /* reserve this event to enqueue note-off later */
865                 tmpev = cell->event;
866                 tmpev.type = SNDRV_SEQ_EVENT_NOTEON;
867                 result = snd_seq_deliver_event(client, &tmpev, atomic, hop);
868 
869                 /*
870                  * This was originally a note event.  We now re-use the
871                  * cell for the note-off event.
872                  */
873 
874                 ev = &cell->event;
875                 ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
876                 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH;
877 
878                 /* add the duration time */
879                 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) {
880                 case SNDRV_SEQ_TIME_STAMP_TICK:
881                         ev->time.tick += ev->data.note.duration;
882                         break;
883                 case SNDRV_SEQ_TIME_STAMP_REAL:
884                         /* unit for duration is ms */
885                         ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000);
886                         ev->time.time.tv_sec += ev->data.note.duration / 1000 +
887                                                 ev->time.time.tv_nsec / 1000000000;
888                         ev->time.time.tv_nsec %= 1000000000;
889                         break;
890                 }
891                 ev->data.note.velocity = ev->data.note.off_velocity;
892 
893                 /* Now queue this cell as the note off event */
894                 if (snd_seq_enqueue_event(cell, atomic, hop) < 0)
895                         snd_seq_cell_free(cell); /* release this cell */
896 
897         } else {
898                 /* Normal events:
899                  * event cell is freed after processing the event
900                  */
901 
902                 result = snd_seq_deliver_event(client, &cell->event, atomic, hop);
903                 snd_seq_cell_free(cell);
904         }
905 
906         snd_seq_client_unlock(client);
907         return result;
908 }
909 
910 
911 /* Allocate a cell from client pool and enqueue it to queue:
912  * if pool is empty and blocking is TRUE, sleep until a new cell is
913  * available.
914  */
915 static int snd_seq_client_enqueue_event(struct snd_seq_client *client,
916                                         struct snd_seq_event *event,
917                                         struct file *file, int blocking,
918                                         int atomic, int hop)
919 {
920         struct snd_seq_event_cell *cell;
921         int err;
922 
923         /* special queue values - force direct passing */
924         if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
925                 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
926                 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
927         } else
928 #ifdef SUPPORT_BROADCAST
929                 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) {
930                         event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST;
931                         event->queue = SNDRV_SEQ_QUEUE_DIRECT;
932                 }
933 #endif
934         if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
935                 /* check presence of source port */
936                 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port);
937                 if (src_port == NULL)
938                         return -EINVAL;
939                 snd_seq_port_unlock(src_port);
940         }
941 
942         /* direct event processing without enqueued */
943         if (snd_seq_ev_is_direct(event)) {
944                 if (event->type == SNDRV_SEQ_EVENT_NOTE)
945                         return -EINVAL; /* this event must be enqueued! */
946                 return snd_seq_deliver_event(client, event, atomic, hop);
947         }
948 
949         /* Not direct, normal queuing */
950         if (snd_seq_queue_is_used(event->queue, client->number) <= 0)
951                 return -EINVAL;  /* invalid queue */
952         if (! snd_seq_write_pool_allocated(client))
953                 return -ENXIO; /* queue is not allocated */
954 
955         /* allocate an event cell */
956         err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, file);
957         if (err < 0)
958                 return err;
959 
960         /* we got a cell. enqueue it. */
961         if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
962                 snd_seq_cell_free(cell);
963                 return err;
964         }
965 
966         return 0;
967 }
968 
969 
970 /*
971  * check validity of event type and data length.
972  * return non-zero if invalid.
973  */
974 static int check_event_type_and_length(struct snd_seq_event *ev)
975 {
976         switch (snd_seq_ev_length_type(ev)) {
977         case SNDRV_SEQ_EVENT_LENGTH_FIXED:
978                 if (snd_seq_ev_is_variable_type(ev))
979                         return -EINVAL;
980                 break;
981         case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
982                 if (! snd_seq_ev_is_variable_type(ev) ||
983                     (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
984                         return -EINVAL;
985                 break;
986         case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
987                 if (! snd_seq_ev_is_direct(ev))
988                         return -EINVAL;
989                 break;
990         }
991         return 0;
992 }
993 
994 
995 /* handle write() */
996 /* possible error values:
997  *      -ENXIO  invalid client or file open mode
998  *      -ENOMEM malloc failed
999  *      -EFAULT seg. fault during copy from user space
1000  *      -EINVAL invalid event
1001  *      -EAGAIN no space in output pool
1002  *      -EINTR  interrupts while sleep
1003  *      -EMLINK too many hops
1004  *      others  depends on return value from driver callback
1005  */
1006 static ssize_t snd_seq_write(struct file *file, const char __user *buf,
1007                              size_t count, loff_t *offset)
1008 {
1009         struct snd_seq_client *client = file->private_data;
1010         int written = 0, len;
1011         int err = -EINVAL;
1012         struct snd_seq_event event;
1013 
1014         if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
1015                 return -ENXIO;
1016 
1017         /* check client structures are in place */
1018         if (snd_BUG_ON(!client))
1019                 return -ENXIO;
1020                 
1021         if (!client->accept_output || client->pool == NULL)
1022                 return -ENXIO;
1023 
1024         /* allocate the pool now if the pool is not allocated yet */ 
1025         if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
1026                 if (snd_seq_pool_init(client->pool) < 0)
1027                         return -ENOMEM;
1028         }
1029 
1030         /* only process whole events */
1031         while (count >= sizeof(struct snd_seq_event)) {
1032                 /* Read in the event header from the user */
1033                 len = sizeof(event);
1034                 if (copy_from_user(&event, buf, len)) {
1035                         err = -EFAULT;
1036                         break;
1037                 }
1038                 event.source.client = client->number;   /* fill in client number */
1039                 /* Check for extension data length */
1040                 if (check_event_type_and_length(&event)) {
1041                         err = -EINVAL;
1042                         break;
1043                 }
1044 
1045                 /* check for special events */
1046                 if (event.type == SNDRV_SEQ_EVENT_NONE)
1047                         goto __skip_event;
1048                 else if (snd_seq_ev_is_reserved(&event)) {
1049                         err = -EINVAL;
1050                         break;
1051                 }
1052 
1053                 if (snd_seq_ev_is_variable(&event)) {
1054                         int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK;
1055                         if ((size_t)(extlen + len) > count) {
1056                                 /* back out, will get an error this time or next */
1057                                 err = -EINVAL;
1058                                 break;
1059                         }
1060                         /* set user space pointer */
1061                         event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
1062                         event.data.ext.ptr = (char __force *)buf
1063                                                 + sizeof(struct snd_seq_event);
1064                         len += extlen; /* increment data length */
1065                 } else {
1066 #ifdef CONFIG_COMPAT
1067                         if (client->convert32 && snd_seq_ev_is_varusr(&event)) {
1068                                 void *ptr = (void __force *)compat_ptr(event.data.raw32.d[1]);
1069                                 event.data.ext.ptr = ptr;
1070                         }
1071 #endif
1072                 }
1073 
1074                 /* ok, enqueue it */
1075                 err = snd_seq_client_enqueue_event(client, &event, file,
1076                                                    !(file->f_flags & O_NONBLOCK),
1077                                                    0, 0);
1078                 if (err < 0)
1079                         break;
1080 
1081         __skip_event:
1082                 /* Update pointers and counts */
1083                 count -= len;
1084                 buf += len;
1085                 written += len;
1086         }
1087 
1088         return written ? written : err;
1089 }
1090 
1091 
1092 /*
1093  * handle polling
1094  */
1095 static unsigned int snd_seq_poll(struct file *file, poll_table * wait)
1096 {
1097         struct snd_seq_client *client = file->private_data;
1098         unsigned int mask = 0;
1099 
1100         /* check client structures are in place */
1101         if (snd_BUG_ON(!client))
1102                 return -ENXIO;
1103 
1104         if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1105             client->data.user.fifo) {
1106 
1107                 /* check if data is available in the outqueue */
1108                 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
1109                         mask |= POLLIN | POLLRDNORM;
1110         }
1111 
1112         if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1113 
1114                 /* check if data is available in the pool */
1115                 if (!snd_seq_write_pool_allocated(client) ||
1116                     snd_seq_pool_poll_wait(client->pool, file, wait))
1117                         mask |= POLLOUT | POLLWRNORM;
1118         }
1119 
1120         return mask;
1121 }
1122 
1123 
1124 /*-----------------------------------------------------*/
1125 
1126 
1127 /* SYSTEM_INFO ioctl() */
1128 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void __user *arg)
1129 {
1130         struct snd_seq_system_info info;
1131 
1132         memset(&info, 0, sizeof(info));
1133         /* fill the info fields */
1134         info.queues = SNDRV_SEQ_MAX_QUEUES;
1135         info.clients = SNDRV_SEQ_MAX_CLIENTS;
1136         info.ports = 256;       /* fixed limit */
1137         info.channels = 256;    /* fixed limit */
1138         info.cur_clients = client_usage.cur;
1139         info.cur_queues = snd_seq_queue_get_cur_queues();
1140 
1141         if (copy_to_user(arg, &info, sizeof(info)))
1142                 return -EFAULT;
1143         return 0;
1144 }
1145 
1146 
1147 /* RUNNING_MODE ioctl() */
1148 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void __user *arg)
1149 {
1150         struct snd_seq_running_info info;
1151         struct snd_seq_client *cptr;
1152         int err = 0;
1153 
1154         if (copy_from_user(&info, arg, sizeof(info)))
1155                 return -EFAULT;
1156 
1157         /* requested client number */
1158         cptr = snd_seq_client_use_ptr(info.client);
1159         if (cptr == NULL)
1160                 return -ENOENT;         /* don't change !!! */
1161 
1162 #ifdef SNDRV_BIG_ENDIAN
1163         if (! info.big_endian) {
1164                 err = -EINVAL;
1165                 goto __err;
1166         }
1167 #else
1168         if (info.big_endian) {
1169                 err = -EINVAL;
1170                 goto __err;
1171         }
1172 
1173 #endif
1174         if (info.cpu_mode > sizeof(long)) {
1175                 err = -EINVAL;
1176                 goto __err;
1177         }
1178         cptr->convert32 = (info.cpu_mode < sizeof(long));
1179  __err:
1180         snd_seq_client_unlock(cptr);
1181         return err;
1182 }
1183 
1184 /* CLIENT_INFO ioctl() */
1185 static void get_client_info(struct snd_seq_client *cptr,
1186                             struct snd_seq_client_info *info)
1187 {
1188         info->client = cptr->number;
1189 
1190         /* fill the info fields */
1191         info->type = cptr->type;
1192         strcpy(info->name, cptr->name);
1193         info->filter = cptr->filter;
1194         info->event_lost = cptr->event_lost;
1195         memcpy(info->event_filter, cptr->event_filter, 32);
1196         info->num_ports = cptr->num_ports;
1197         memset(info->reserved, 0, sizeof(info->reserved));
1198 }
1199 
1200 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
1201                                          void __user *arg)
1202 {
1203         struct snd_seq_client *cptr;
1204         struct snd_seq_client_info client_info;
1205 
1206         if (copy_from_user(&client_info, arg, sizeof(client_info)))
1207                 return -EFAULT;
1208 
1209         /* requested client number */
1210         cptr = snd_seq_client_use_ptr(client_info.client);
1211         if (cptr == NULL)
1212                 return -ENOENT;         /* don't change !!! */
1213 
1214         get_client_info(cptr, &client_info);
1215         snd_seq_client_unlock(cptr);
1216 
1217         if (copy_to_user(arg, &client_info, sizeof(client_info)))
1218                 return -EFAULT;
1219         return 0;
1220 }
1221 
1222 
1223 /* CLIENT_INFO ioctl() */
1224 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
1225                                          void __user *arg)
1226 {
1227         struct snd_seq_client_info client_info;
1228 
1229         if (copy_from_user(&client_info, arg, sizeof(client_info)))
1230                 return -EFAULT;
1231 
1232         /* it is not allowed to set the info fields for an another client */
1233         if (client->number != client_info.client)
1234                 return -EPERM;
1235         /* also client type must be set now */
1236         if (client->type != client_info.type)
1237                 return -EINVAL;
1238 
1239         /* fill the info fields */
1240         if (client_info.name[0])
1241                 strlcpy(client->name, client_info.name, sizeof(client->name));
1242 
1243         client->filter = client_info.filter;
1244         client->event_lost = client_info.event_lost;
1245         memcpy(client->event_filter, client_info.event_filter, 32);
1246 
1247         return 0;
1248 }
1249 
1250 
1251 /* 
1252  * CREATE PORT ioctl() 
1253  */
1254 static int snd_seq_ioctl_create_port(struct snd_seq_client *client,
1255                                      void __user *arg)
1256 {
1257         struct snd_seq_client_port *port;
1258         struct snd_seq_port_info info;
1259         struct snd_seq_port_callback *callback;
1260 
1261         if (copy_from_user(&info, arg, sizeof(info)))
1262                 return -EFAULT;
1263 
1264         /* it is not allowed to create the port for an another client */
1265         if (info.addr.client != client->number)
1266                 return -EPERM;
1267 
1268         port = snd_seq_create_port(client, (info.flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info.addr.port : -1);
1269         if (port == NULL)
1270                 return -ENOMEM;
1271 
1272         if (client->type == USER_CLIENT && info.kernel) {
1273                 snd_seq_delete_port(client, port->addr.port);
1274                 return -EINVAL;
1275         }
1276         if (client->type == KERNEL_CLIENT) {
1277                 if ((callback = info.kernel) != NULL) {
1278                         if (callback->owner)
1279                                 port->owner = callback->owner;
1280                         port->private_data = callback->private_data;
1281                         port->private_free = callback->private_free;
1282                         port->callback_all = callback->callback_all;
1283                         port->event_input = callback->event_input;
1284                         port->c_src.open = callback->subscribe;
1285                         port->c_src.close = callback->unsubscribe;
1286                         port->c_dest.open = callback->use;
1287                         port->c_dest.close = callback->unuse;
1288                 }
1289         }
1290 
1291         info.addr = port->addr;
1292 
1293         snd_seq_set_port_info(port, &info);
1294         snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1295 
1296         if (copy_to_user(arg, &info, sizeof(info)))
1297                 return -EFAULT;
1298 
1299         return 0;
1300 }
1301 
1302 /* 
1303  * DELETE PORT ioctl() 
1304  */
1305 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client,
1306                                      void __user *arg)
1307 {
1308         struct snd_seq_port_info info;
1309         int err;
1310 
1311         /* set passed parameters */
1312         if (copy_from_user(&info, arg, sizeof(info)))
1313                 return -EFAULT;
1314         
1315         /* it is not allowed to remove the port for an another client */
1316         if (info.addr.client != client->number)
1317                 return -EPERM;
1318 
1319         err = snd_seq_delete_port(client, info.addr.port);
1320         if (err >= 0)
1321                 snd_seq_system_client_ev_port_exit(client->number, info.addr.port);
1322         return err;
1323 }
1324 
1325 
1326 /* 
1327  * GET_PORT_INFO ioctl() (on any client) 
1328  */
1329 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client,
1330                                        void __user *arg)
1331 {
1332         struct snd_seq_client *cptr;
1333         struct snd_seq_client_port *port;
1334         struct snd_seq_port_info info;
1335 
1336         if (copy_from_user(&info, arg, sizeof(info)))
1337                 return -EFAULT;
1338         cptr = snd_seq_client_use_ptr(info.addr.client);
1339         if (cptr == NULL)
1340                 return -ENXIO;
1341 
1342         port = snd_seq_port_use_ptr(cptr, info.addr.port);
1343         if (port == NULL) {
1344                 snd_seq_client_unlock(cptr);
1345                 return -ENOENT;                 /* don't change */
1346         }
1347 
1348         /* get port info */
1349         snd_seq_get_port_info(port, &info);
1350         snd_seq_port_unlock(port);
1351         snd_seq_client_unlock(cptr);
1352 
1353         if (copy_to_user(arg, &info, sizeof(info)))
1354                 return -EFAULT;
1355         return 0;
1356 }
1357 
1358 
1359 /* 
1360  * SET_PORT_INFO ioctl() (only ports on this/own client) 
1361  */
1362 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client,
1363                                        void __user *arg)
1364 {
1365         struct snd_seq_client_port *port;
1366         struct snd_seq_port_info info;
1367 
1368         if (copy_from_user(&info, arg, sizeof(info)))
1369                 return -EFAULT;
1370 
1371         if (info.addr.client != client->number) /* only set our own ports ! */
1372                 return -EPERM;
1373         port = snd_seq_port_use_ptr(client, info.addr.port);
1374         if (port) {
1375                 snd_seq_set_port_info(port, &info);
1376                 snd_seq_port_unlock(port);
1377         }
1378         return 0;
1379 }
1380 
1381 
1382 /*
1383  * port subscription (connection)
1384  */
1385 #define PERM_RD         (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1386 #define PERM_WR         (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1387 
1388 static int check_subscription_permission(struct snd_seq_client *client,
1389                                          struct snd_seq_client_port *sport,
1390                                          struct snd_seq_client_port *dport,
1391                                          struct snd_seq_port_subscribe *subs)
1392 {
1393         if (client->number != subs->sender.client &&
1394             client->number != subs->dest.client) {
1395                 /* connection by third client - check export permission */
1396                 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1397                         return -EPERM;
1398                 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1399                         return -EPERM;
1400         }
1401 
1402         /* check read permission */
1403         /* if sender or receiver is the subscribing client itself,
1404          * no permission check is necessary
1405          */
1406         if (client->number != subs->sender.client) {
1407                 if (! check_port_perm(sport, PERM_RD))
1408                         return -EPERM;
1409         }
1410         /* check write permission */
1411         if (client->number != subs->dest.client) {
1412                 if (! check_port_perm(dport, PERM_WR))
1413                         return -EPERM;
1414         }
1415         return 0;
1416 }
1417 
1418 /*
1419  * send an subscription notify event to user client:
1420  * client must be user client.
1421  */
1422 int snd_seq_client_notify_subscription(int client, int port,
1423                                        struct snd_seq_port_subscribe *info,
1424                                        int evtype)
1425 {
1426         struct snd_seq_event event;
1427 
1428         memset(&event, 0, sizeof(event));
1429         event.type = evtype;
1430         event.data.connect.dest = info->dest;
1431         event.data.connect.sender = info->sender;
1432 
1433         return snd_seq_system_notify(client, port, &event);  /* non-atomic */
1434 }
1435 
1436 
1437 /* 
1438  * add to port's subscription list IOCTL interface 
1439  */
1440 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
1441                                         void __user *arg)
1442 {
1443         int result = -EINVAL;
1444         struct snd_seq_client *receiver = NULL, *sender = NULL;
1445         struct snd_seq_client_port *sport = NULL, *dport = NULL;
1446         struct snd_seq_port_subscribe subs;
1447 
1448         if (copy_from_user(&subs, arg, sizeof(subs)))
1449                 return -EFAULT;
1450 
1451         if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1452                 goto __end;
1453         if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1454                 goto __end;
1455         if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1456                 goto __end;
1457         if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1458                 goto __end;
1459 
1460         result = check_subscription_permission(client, sport, dport, &subs);
1461         if (result < 0)
1462                 goto __end;
1463 
1464         /* connect them */
1465         result = snd_seq_port_connect(client, sender, sport, receiver, dport, &subs);
1466         if (! result) /* broadcast announce */
1467                 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1468                                                    &subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1469       __end:
1470         if (sport)
1471                 snd_seq_port_unlock(sport);
1472         if (dport)
1473                 snd_seq_port_unlock(dport);
1474         if (sender)
1475                 snd_seq_client_unlock(sender);
1476         if (receiver)
1477                 snd_seq_client_unlock(receiver);
1478         return result;
1479 }
1480 
1481 
1482 /* 
1483  * remove from port's subscription list 
1484  */
1485 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
1486                                           void __user *arg)
1487 {
1488         int result = -ENXIO;
1489         struct snd_seq_client *receiver = NULL, *sender = NULL;
1490         struct snd_seq_client_port *sport = NULL, *dport = NULL;
1491         struct snd_seq_port_subscribe subs;
1492 
1493         if (copy_from_user(&subs, arg, sizeof(subs)))
1494                 return -EFAULT;
1495 
1496         if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1497                 goto __end;
1498         if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1499                 goto __end;
1500         if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1501                 goto __end;
1502         if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1503                 goto __end;
1504 
1505         result = check_subscription_permission(client, sport, dport, &subs);
1506         if (result < 0)
1507                 goto __end;
1508 
1509         result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, &subs);
1510         if (! result) /* broadcast announce */
1511                 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1512                                                    &subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1513       __end:
1514         if (sport)
1515                 snd_seq_port_unlock(sport);
1516         if (dport)
1517                 snd_seq_port_unlock(dport);
1518         if (sender)
1519                 snd_seq_client_unlock(sender);
1520         if (receiver)
1521                 snd_seq_client_unlock(receiver);
1522         return result;
1523 }
1524 
1525 
1526 /* CREATE_QUEUE ioctl() */
1527 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client,
1528                                       void __user *arg)
1529 {
1530         struct snd_seq_queue_info info;
1531         int result;
1532         struct snd_seq_queue *q;
1533 
1534         if (copy_from_user(&info, arg, sizeof(info)))
1535                 return -EFAULT;
1536 
1537         result = snd_seq_queue_alloc(client->number, info.locked, info.flags);
1538         if (result < 0)
1539                 return result;
1540 
1541         q = queueptr(result);
1542         if (q == NULL)
1543                 return -EINVAL;
1544 
1545         info.queue = q->queue;
1546         info.locked = q->locked;
1547         info.owner = q->owner;
1548 
1549         /* set queue name */
1550         if (! info.name[0])
1551                 snprintf(info.name, sizeof(info.name), "Queue-%d", q->queue);
1552         strlcpy(q->name, info.name, sizeof(q->name));
1553         queuefree(q);
1554 
1555         if (copy_to_user(arg, &info, sizeof(info)))
1556                 return -EFAULT;
1557 
1558         return 0;
1559 }
1560 
1561 /* DELETE_QUEUE ioctl() */
1562 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client,
1563                                       void __user *arg)
1564 {
1565         struct snd_seq_queue_info info;
1566 
1567         if (copy_from_user(&info, arg, sizeof(info)))
1568                 return -EFAULT;
1569 
1570         return snd_seq_queue_delete(client->number, info.queue);
1571 }
1572 
1573 /* GET_QUEUE_INFO ioctl() */
1574 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client,
1575                                         void __user *arg)
1576 {
1577         struct snd_seq_queue_info info;
1578         struct snd_seq_queue *q;
1579 
1580         if (copy_from_user(&info, arg, sizeof(info)))
1581                 return -EFAULT;
1582 
1583         q = queueptr(info.queue);
1584         if (q == NULL)
1585                 return -EINVAL;
1586 
1587         memset(&info, 0, sizeof(info));
1588         info.queue = q->queue;
1589         info.owner = q->owner;
1590         info.locked = q->locked;
1591         strlcpy(info.name, q->name, sizeof(info.name));
1592         queuefree(q);
1593 
1594         if (copy_to_user(arg, &info, sizeof(info)))
1595                 return -EFAULT;
1596 
1597         return 0;
1598 }
1599 
1600 /* SET_QUEUE_INFO ioctl() */
1601 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
1602                                         void __user *arg)
1603 {
1604         struct snd_seq_queue_info info;
1605         struct snd_seq_queue *q;
1606 
1607         if (copy_from_user(&info, arg, sizeof(info)))
1608                 return -EFAULT;
1609 
1610         if (info.owner != client->number)
1611                 return -EINVAL;
1612 
1613         /* change owner/locked permission */
1614         if (snd_seq_queue_check_access(info.queue, client->number)) {
1615                 if (snd_seq_queue_set_owner(info.queue, client->number, info.locked) < 0)
1616                         return -EPERM;
1617                 if (info.locked)
1618                         snd_seq_queue_use(info.queue, client->number, 1);
1619         } else {
1620                 return -EPERM;
1621         }       
1622 
1623         q = queueptr(info.queue);
1624         if (! q)
1625                 return -EINVAL;
1626         if (q->owner != client->number) {
1627                 queuefree(q);
1628                 return -EPERM;
1629         }
1630         strlcpy(q->name, info.name, sizeof(q->name));
1631         queuefree(q);
1632 
1633         return 0;
1634 }
1635 
1636 /* GET_NAMED_QUEUE ioctl() */
1637 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client, void __user *arg)
1638 {
1639         struct snd_seq_queue_info info;
1640         struct snd_seq_queue *q;
1641 
1642         if (copy_from_user(&info, arg, sizeof(info)))
1643                 return -EFAULT;
1644 
1645         q = snd_seq_queue_find_name(info.name);
1646         if (q == NULL)
1647                 return -EINVAL;
1648         info.queue = q->queue;
1649         info.owner = q->owner;
1650         info.locked = q->locked;
1651         queuefree(q);
1652 
1653         if (copy_to_user(arg, &info, sizeof(info)))
1654                 return -EFAULT;
1655 
1656         return 0;
1657 }
1658 
1659 /* GET_QUEUE_STATUS ioctl() */
1660 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
1661                                           void __user *arg)
1662 {
1663         struct snd_seq_queue_status status;
1664         struct snd_seq_queue *queue;
1665         struct snd_seq_timer *tmr;
1666 
1667         if (copy_from_user(&status, arg, sizeof(status)))
1668                 return -EFAULT;
1669 
1670         queue = queueptr(status.queue);
1671         if (queue == NULL)
1672                 return -EINVAL;
1673         memset(&status, 0, sizeof(status));
1674         status.queue = queue->queue;
1675         
1676         tmr = queue->timer;
1677         status.events = queue->tickq->cells + queue->timeq->cells;
1678 
1679         status.time = snd_seq_timer_get_cur_time(tmr);
1680         status.tick = snd_seq_timer_get_cur_tick(tmr);
1681 
1682         status.running = tmr->running;
1683 
1684         status.flags = queue->flags;
1685         queuefree(queue);
1686 
1687         if (copy_to_user(arg, &status, sizeof(status)))
1688                 return -EFAULT;
1689         return 0;
1690 }
1691 
1692 
1693 /* GET_QUEUE_TEMPO ioctl() */
1694 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
1695                                          void __user *arg)
1696 {
1697         struct snd_seq_queue_tempo tempo;
1698         struct snd_seq_queue *queue;
1699         struct snd_seq_timer *tmr;
1700 
1701         if (copy_from_user(&tempo, arg, sizeof(tempo)))
1702                 return -EFAULT;
1703 
1704         queue = queueptr(tempo.queue);
1705         if (queue == NULL)
1706                 return -EINVAL;
1707         memset(&tempo, 0, sizeof(tempo));
1708         tempo.queue = queue->queue;
1709         
1710         tmr = queue->timer;
1711 
1712         tempo.tempo = tmr->tempo;
1713         tempo.ppq = tmr->ppq;
1714         tempo.skew_value = tmr->skew;
1715         tempo.skew_base = tmr->skew_base;
1716         queuefree(queue);
1717 
1718         if (copy_to_user(arg, &tempo, sizeof(tempo)))
1719                 return -EFAULT;
1720         return 0;
1721 }
1722 
1723 
1724 /* SET_QUEUE_TEMPO ioctl() */
1725 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1726 {
1727         if (!snd_seq_queue_check_access(tempo->queue, client))
1728                 return -EPERM;
1729         return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1730 }
1731 
1732 EXPORT_SYMBOL(snd_seq_set_queue_tempo);
1733 
1734 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
1735                                          void __user *arg)
1736 {
1737         int result;
1738         struct snd_seq_queue_tempo tempo;
1739 
1740         if (copy_from_user(&tempo, arg, sizeof(tempo)))
1741                 return -EFAULT;
1742 
1743         result = snd_seq_set_queue_tempo(client->number, &tempo);
1744         return result < 0 ? result : 0;
1745 }
1746 
1747 
1748 /* GET_QUEUE_TIMER ioctl() */
1749 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
1750                                          void __user *arg)
1751 {
1752         struct snd_seq_queue_timer timer;
1753         struct snd_seq_queue *queue;
1754         struct snd_seq_timer *tmr;
1755 
1756         if (copy_from_user(&timer, arg, sizeof(timer)))
1757                 return -EFAULT;
1758 
1759         queue = queueptr(timer.queue);
1760         if (queue == NULL)
1761                 return -EINVAL;
1762 
1763         if (mutex_lock_interruptible(&queue->timer_mutex)) {
1764                 queuefree(queue);
1765                 return -ERESTARTSYS;
1766         }
1767         tmr = queue->timer;
1768         memset(&timer, 0, sizeof(timer));
1769         timer.queue = queue->queue;
1770 
1771         timer.type = tmr->type;
1772         if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1773                 timer.u.alsa.id = tmr->alsa_id;
1774                 timer.u.alsa.resolution = tmr->preferred_resolution;
1775         }
1776         mutex_unlock(&queue->timer_mutex);
1777         queuefree(queue);
1778         
1779         if (copy_to_user(arg, &timer, sizeof(timer)))
1780                 return -EFAULT;
1781         return 0;
1782 }
1783 
1784 
1785 /* SET_QUEUE_TIMER ioctl() */
1786 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
1787                                          void __user *arg)
1788 {
1789         int result = 0;
1790         struct snd_seq_queue_timer timer;
1791 
1792         if (copy_from_user(&timer, arg, sizeof(timer)))
1793                 return -EFAULT;
1794 
1795         if (timer.type != SNDRV_SEQ_TIMER_ALSA)
1796                 return -EINVAL;
1797 
1798         if (snd_seq_queue_check_access(timer.queue, client->number)) {
1799                 struct snd_seq_queue *q;
1800                 struct snd_seq_timer *tmr;
1801 
1802                 q = queueptr(timer.queue);
1803                 if (q == NULL)
1804                         return -ENXIO;
1805                 if (mutex_lock_interruptible(&q->timer_mutex)) {
1806                         queuefree(q);
1807                         return -ERESTARTSYS;
1808                 }
1809                 tmr = q->timer;
1810                 snd_seq_queue_timer_close(timer.queue);
1811                 tmr->type = timer.type;
1812                 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1813                         tmr->alsa_id = timer.u.alsa.id;
1814                         tmr->preferred_resolution = timer.u.alsa.resolution;
1815                 }
1816                 result = snd_seq_queue_timer_open(timer.queue);
1817                 mutex_unlock(&q->timer_mutex);
1818                 queuefree(q);
1819         } else {
1820                 return -EPERM;
1821         }       
1822 
1823         return result;
1824 }
1825 
1826 
1827 /* GET_QUEUE_CLIENT ioctl() */
1828 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
1829                                           void __user *arg)
1830 {
1831         struct snd_seq_queue_client info;
1832         int used;
1833 
1834         if (copy_from_user(&info, arg, sizeof(info)))
1835                 return -EFAULT;
1836 
1837         used = snd_seq_queue_is_used(info.queue, client->number);
1838         if (used < 0)
1839                 return -EINVAL;
1840         info.used = used;
1841         info.client = client->number;
1842 
1843         if (copy_to_user(arg, &info, sizeof(info)))
1844                 return -EFAULT;
1845         return 0;
1846 }
1847 
1848 
1849 /* SET_QUEUE_CLIENT ioctl() */
1850 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
1851                                           void __user *arg)
1852 {
1853         int err;
1854         struct snd_seq_queue_client info;
1855 
1856         if (copy_from_user(&info, arg, sizeof(info)))
1857                 return -EFAULT;
1858 
1859         if (info.used >= 0) {
1860                 err = snd_seq_queue_use(info.queue, client->number, info.used);
1861                 if (err < 0)
1862                         return err;
1863         }
1864 
1865         return snd_seq_ioctl_get_queue_client(client, arg);
1866 }
1867 
1868 
1869 /* GET_CLIENT_POOL ioctl() */
1870 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
1871                                          void __user *arg)
1872 {
1873         struct snd_seq_client_pool info;
1874         struct snd_seq_client *cptr;
1875 
1876         if (copy_from_user(&info, arg, sizeof(info)))
1877                 return -EFAULT;
1878 
1879         cptr = snd_seq_client_use_ptr(info.client);
1880         if (cptr == NULL)
1881                 return -ENOENT;
1882         memset(&info, 0, sizeof(info));
1883         info.output_pool = cptr->pool->size;
1884         info.output_room = cptr->pool->room;
1885         info.output_free = info.output_pool;
1886         info.output_free = snd_seq_unused_cells(cptr->pool);
1887         if (cptr->type == USER_CLIENT) {
1888                 info.input_pool = cptr->data.user.fifo_pool_size;
1889                 info.input_free = info.input_pool;
1890                 if (cptr->data.user.fifo)
1891                         info.input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool);
1892         } else {
1893                 info.input_pool = 0;
1894                 info.input_free = 0;
1895         }
1896         snd_seq_client_unlock(cptr);
1897         
1898         if (copy_to_user(arg, &info, sizeof(info)))
1899                 return -EFAULT;
1900         return 0;
1901 }
1902 
1903 /* SET_CLIENT_POOL ioctl() */
1904 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
1905                                          void __user *arg)
1906 {
1907         struct snd_seq_client_pool info;
1908         int rc;
1909 
1910         if (copy_from_user(&info, arg, sizeof(info)))
1911                 return -EFAULT;
1912 
1913         if (client->number != info.client)
1914                 return -EINVAL; /* can't change other clients */
1915 
1916         if (info.output_pool >= 1 && info.output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1917             (! snd_seq_write_pool_allocated(client) ||
1918              info.output_pool != client->pool->size)) {
1919                 if (snd_seq_write_pool_allocated(client)) {
1920                         /* remove all existing cells */
1921                         snd_seq_queue_client_leave_cells(client->number);
1922                         snd_seq_pool_done(client->pool);
1923                 }
1924                 client->pool->size = info.output_pool;
1925                 rc = snd_seq_pool_init(client->pool);
1926                 if (rc < 0)
1927                         return rc;
1928         }
1929         if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
1930             info.input_pool >= 1 &&
1931             info.input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1932             info.input_pool != client->data.user.fifo_pool_size) {
1933                 /* change pool size */
1934                 rc = snd_seq_fifo_resize(client->data.user.fifo, info.input_pool);
1935                 if (rc < 0)
1936                         return rc;
1937                 client->data.user.fifo_pool_size = info.input_pool;
1938         }
1939         if (info.output_room >= 1 &&
1940             info.output_room <= client->pool->size) {
1941                 client->pool->room  = info.output_room;
1942         }
1943 
1944         return snd_seq_ioctl_get_client_pool(client, arg);
1945 }
1946 
1947 
1948 /* REMOVE_EVENTS ioctl() */
1949 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
1950                                        void __user *arg)
1951 {
1952         struct snd_seq_remove_events info;
1953 
1954         if (copy_from_user(&info, arg, sizeof(info)))
1955                 return -EFAULT;
1956 
1957         /*
1958          * Input mostly not implemented XXX.
1959          */
1960         if (info.remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1961                 /*
1962                  * No restrictions so for a user client we can clear
1963                  * the whole fifo
1964                  */
1965                 if (client->type == USER_CLIENT)
1966                         snd_seq_fifo_clear(client->data.user.fifo);
1967         }
1968 
1969         if (info.remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1970                 snd_seq_queue_remove_cells(client->number, &info);
1971 
1972         return 0;
1973 }
1974 
1975 
1976 /*
1977  * get subscription info
1978  */
1979 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
1980                                           void __user *arg)
1981 {
1982         int result;
1983         struct snd_seq_client *sender = NULL;
1984         struct snd_seq_client_port *sport = NULL;
1985         struct snd_seq_port_subscribe subs;
1986         struct snd_seq_subscribers *p;
1987 
1988         if (copy_from_user(&subs, arg, sizeof(subs)))
1989                 return -EFAULT;
1990 
1991         result = -EINVAL;
1992         if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1993                 goto __end;
1994         if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1995                 goto __end;
1996         p = snd_seq_port_get_subscription(&sport->c_src, &subs.dest);
1997         if (p) {
1998                 result = 0;
1999                 subs = p->info;
2000         } else
2001                 result = -ENOENT;
2002 
2003       __end:
2004         if (sport)
2005                 snd_seq_port_unlock(sport);
2006         if (sender)
2007                 snd_seq_client_unlock(sender);
2008         if (result >= 0) {
2009                 if (copy_to_user(arg, &subs, sizeof(subs)))
2010                         return -EFAULT;
2011         }
2012         return result;
2013 }
2014 
2015 
2016 /*
2017  * get subscription info - check only its presence
2018  */
2019 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client,
2020                                     void __user *arg)
2021 {
2022         int result = -ENXIO;
2023         struct snd_seq_client *cptr = NULL;
2024         struct snd_seq_client_port *port = NULL;
2025         struct snd_seq_query_subs subs;
2026         struct snd_seq_port_subs_info *group;
2027         struct list_head *p;
2028         int i;
2029 
2030         if (copy_from_user(&subs, arg, sizeof(subs)))
2031                 return -EFAULT;
2032 
2033         if ((cptr = snd_seq_client_use_ptr(subs.root.client)) == NULL)
2034                 goto __end;
2035         if ((port = snd_seq_port_use_ptr(cptr, subs.root.port)) == NULL)
2036                 goto __end;
2037 
2038         switch (subs.type) {
2039         case SNDRV_SEQ_QUERY_SUBS_READ:
2040                 group = &port->c_src;
2041                 break;
2042         case SNDRV_SEQ_QUERY_SUBS_WRITE:
2043                 group = &port->c_dest;
2044                 break;
2045         default:
2046                 goto __end;
2047         }
2048 
2049         down_read(&group->list_mutex);
2050         /* search for the subscriber */
2051         subs.num_subs = group->count;
2052         i = 0;
2053         result = -ENOENT;
2054         list_for_each(p, &group->list_head) {
2055                 if (i++ == subs.index) {
2056                         /* found! */
2057                         struct snd_seq_subscribers *s;
2058                         if (subs.type == SNDRV_SEQ_QUERY_SUBS_READ) {
2059                                 s = list_entry(p, struct snd_seq_subscribers, src_list);
2060                                 subs.addr = s->info.dest;
2061                         } else {
2062                                 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2063                                 subs.addr = s->info.sender;
2064                         }
2065                         subs.flags = s->info.flags;
2066                         subs.queue = s->info.queue;
2067                         result = 0;
2068                         break;
2069                 }
2070         }
2071         up_read(&group->list_mutex);
2072 
2073       __end:
2074         if (port)
2075                 snd_seq_port_unlock(port);
2076         if (cptr)
2077                 snd_seq_client_unlock(cptr);
2078         if (result >= 0) {
2079                 if (copy_to_user(arg, &subs, sizeof(subs)))
2080                         return -EFAULT;
2081         }
2082         return result;
2083 }
2084 
2085 
2086 /*
2087  * query next client
2088  */
2089 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
2090                                            void __user *arg)
2091 {
2092         struct snd_seq_client *cptr = NULL;
2093         struct snd_seq_client_info info;
2094 
2095         if (copy_from_user(&info, arg, sizeof(info)))
2096                 return -EFAULT;
2097 
2098         /* search for next client */
2099         info.client++;
2100         if (info.client < 0)
2101                 info.client = 0;
2102         for (; info.client < SNDRV_SEQ_MAX_CLIENTS; info.client++) {
2103                 cptr = snd_seq_client_use_ptr(info.client);
2104                 if (cptr)
2105                         break; /* found */
2106         }
2107         if (cptr == NULL)
2108                 return -ENOENT;
2109 
2110         get_client_info(cptr, &info);
2111         snd_seq_client_unlock(cptr);
2112 
2113         if (copy_to_user(arg, &info, sizeof(info)))
2114                 return -EFAULT;
2115         return 0;
2116 }
2117 
2118 /* 
2119  * query next port
2120  */
2121 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
2122                                          void __user *arg)
2123 {
2124         struct snd_seq_client *cptr;
2125         struct snd_seq_client_port *port = NULL;
2126         struct snd_seq_port_info info;
2127 
2128         if (copy_from_user(&info, arg, sizeof(info)))
2129                 return -EFAULT;
2130         cptr = snd_seq_client_use_ptr(info.addr.client);
2131         if (cptr == NULL)
2132                 return -ENXIO;
2133 
2134         /* search for next port */
2135         info.addr.port++;
2136         port = snd_seq_port_query_nearest(cptr, &info);
2137         if (port == NULL) {
2138                 snd_seq_client_unlock(cptr);
2139                 return -ENOENT;
2140         }
2141 
2142         /* get port info */
2143         info.addr = port->addr;
2144         snd_seq_get_port_info(port, &info);
2145         snd_seq_port_unlock(port);
2146         snd_seq_client_unlock(cptr);
2147 
2148         if (copy_to_user(arg, &info, sizeof(info)))
2149                 return -EFAULT;
2150         return 0;
2151 }
2152 
2153 /* -------------------------------------------------------- */
2154 
2155 static struct seq_ioctl_table {
2156         unsigned int cmd;
2157         int (*func)(struct snd_seq_client *client, void __user * arg);
2158 } ioctl_tables[] = {
2159         { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2160         { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2161         { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2162         { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2163         { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2164         { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2165         { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2166         { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2167         { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2168         { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2169         { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2170         { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2171         { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2172         { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2173         { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2174         { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2175         { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2176         { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2177         { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2178         { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2179         { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2180         { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2181         { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2182         { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2183         { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2184         { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2185         { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2186         { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2187         { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2188         { 0, NULL },
2189 };
2190 
2191 static int snd_seq_do_ioctl(struct snd_seq_client *client, unsigned int cmd,
2192                             void __user *arg)
2193 {
2194         struct seq_ioctl_table *p;
2195 
2196         switch (cmd) {
2197         case SNDRV_SEQ_IOCTL_PVERSION:
2198                 /* return sequencer version number */
2199                 return put_user(SNDRV_SEQ_VERSION, (int __user *)arg) ? -EFAULT : 0;
2200         case SNDRV_SEQ_IOCTL_CLIENT_ID:
2201                 /* return the id of this client */
2202                 return put_user(client->number, (int __user *)arg) ? -EFAULT : 0;
2203         }
2204 
2205         if (! arg)
2206                 return -EFAULT;
2207         for (p = ioctl_tables; p->cmd; p++) {
2208                 if (p->cmd == cmd)
2209                         return p->func(client, arg);
2210         }
2211         pr_debug("ALSA: seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n",
2212                    cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2213         return -ENOTTY;
2214 }
2215 
2216 
2217 static long snd_seq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2218 {
2219         struct snd_seq_client *client = file->private_data;
2220 
2221         if (snd_BUG_ON(!client))
2222                 return -ENXIO;
2223                 
2224         return snd_seq_do_ioctl(client, cmd, (void __user *) arg);
2225 }
2226 
2227 #ifdef CONFIG_COMPAT
2228 #include "seq_compat.c"
2229 #else
2230 #define snd_seq_ioctl_compat    NULL
2231 #endif
2232 
2233 /* -------------------------------------------------------- */
2234 
2235 
2236 /* exported to kernel modules */
2237 int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
2238                                  const char *name_fmt, ...)
2239 {
2240         struct snd_seq_client *client;
2241         va_list args;
2242 
2243         if (snd_BUG_ON(in_interrupt()))
2244                 return -EBUSY;
2245 
2246         if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD)
2247                 return -EINVAL;
2248         if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
2249                 return -EINVAL;
2250 
2251         if (mutex_lock_interruptible(&register_mutex))
2252                 return -ERESTARTSYS;
2253 
2254         if (card) {
2255                 client_index += SNDRV_SEQ_GLOBAL_CLIENTS
2256                         + card->number * SNDRV_SEQ_CLIENTS_PER_CARD;
2257                 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN)
2258                         client_index = -1;
2259         }
2260 
2261         /* empty write queue as default */
2262         client = seq_create_client1(client_index, 0);
2263         if (client == NULL) {
2264                 mutex_unlock(&register_mutex);
2265                 return -EBUSY;  /* failure code */
2266         }
2267         usage_alloc(&client_usage, 1);
2268 
2269         client->accept_input = 1;
2270         client->accept_output = 1;
2271                 
2272         va_start(args, name_fmt);
2273         vsnprintf(client->name, sizeof(client->name), name_fmt, args);
2274         va_end(args);
2275 
2276         client->type = KERNEL_CLIENT;
2277         mutex_unlock(&register_mutex);
2278 
2279         /* make others aware this new client */
2280         snd_seq_system_client_ev_client_start(client->number);
2281         
2282         /* return client number to caller */
2283         return client->number;
2284 }
2285 
2286 EXPORT_SYMBOL(snd_seq_create_kernel_client);
2287 
2288 /* exported to kernel modules */
2289 int snd_seq_delete_kernel_client(int client)
2290 {
2291         struct snd_seq_client *ptr;
2292 
2293         if (snd_BUG_ON(in_interrupt()))
2294                 return -EBUSY;
2295 
2296         ptr = clientptr(client);
2297         if (ptr == NULL)
2298                 return -EINVAL;
2299 
2300         seq_free_client(ptr);
2301         kfree(ptr);
2302         return 0;
2303 }
2304 
2305 EXPORT_SYMBOL(snd_seq_delete_kernel_client);
2306 
2307 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue
2308  * and snd_seq_kernel_client_enqueue_blocking
2309  */
2310 static int kernel_client_enqueue(int client, struct snd_seq_event *ev,
2311                                  struct file *file, int blocking,
2312                                  int atomic, int hop)
2313 {
2314         struct snd_seq_client *cptr;
2315         int result;
2316 
2317         if (snd_BUG_ON(!ev))
2318                 return -EINVAL;
2319 
2320         if (ev->type == SNDRV_SEQ_EVENT_NONE)
2321                 return 0; /* ignore this */
2322         if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2323                 return -EINVAL; /* quoted events can't be enqueued */
2324 
2325         /* fill in client number */
2326         ev->source.client = client;
2327 
2328         if (check_event_type_and_length(ev))
2329                 return -EINVAL;
2330 
2331         cptr = snd_seq_client_use_ptr(client);
2332         if (cptr == NULL)
2333                 return -EINVAL;
2334         
2335         if (! cptr->accept_output)
2336                 result = -EPERM;
2337         else /* send it */
2338                 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, atomic, hop);
2339 
2340         snd_seq_client_unlock(cptr);
2341         return result;
2342 }
2343 
2344 /*
2345  * exported, called by kernel clients to enqueue events (w/o blocking)
2346  *
2347  * RETURN VALUE: zero if succeed, negative if error
2348  */
2349 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev,
2350                                   int atomic, int hop)
2351 {
2352         return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop);
2353 }
2354 
2355 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
2356 
2357 /*
2358  * exported, called by kernel clients to enqueue events (with blocking)
2359  *
2360  * RETURN VALUE: zero if succeed, negative if error
2361  */
2362 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev,
2363                                            struct file *file,
2364                                            int atomic, int hop)
2365 {
2366         return kernel_client_enqueue(client, ev, file, 1, atomic, hop);
2367 }
2368 
2369 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking);
2370 
2371 /* 
2372  * exported, called by kernel clients to dispatch events directly to other
2373  * clients, bypassing the queues.  Event time-stamp will be updated.
2374  *
2375  * RETURN VALUE: negative = delivery failed,
2376  *               zero, or positive: the number of delivered events
2377  */
2378 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev,
2379                                    int atomic, int hop)
2380 {
2381         struct snd_seq_client *cptr;
2382         int result;
2383 
2384         if (snd_BUG_ON(!ev))
2385                 return -EINVAL;
2386 
2387         /* fill in client number */
2388         ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2389         ev->source.client = client;
2390 
2391         if (check_event_type_and_length(ev))
2392                 return -EINVAL;
2393 
2394         cptr = snd_seq_client_use_ptr(client);
2395         if (cptr == NULL)
2396                 return -EINVAL;
2397 
2398         if (!cptr->accept_output)
2399                 result = -EPERM;
2400         else
2401                 result = snd_seq_deliver_event(cptr, ev, atomic, hop);
2402 
2403         snd_seq_client_unlock(cptr);
2404         return result;
2405 }
2406 
2407 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch);
2408 
2409 /*
2410  * exported, called by kernel clients to perform same functions as with
2411  * userland ioctl() 
2412  */
2413 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2414 {
2415         struct snd_seq_client *client;
2416         mm_segment_t fs;
2417         int result;
2418 
2419         client = clientptr(clientid);
2420         if (client == NULL)
2421                 return -ENXIO;
2422         fs = snd_enter_user();
2423         result = snd_seq_do_ioctl(client, cmd, (void __force __user *)arg);
2424         snd_leave_user(fs);
2425         return result;
2426 }
2427 
2428 EXPORT_SYMBOL(snd_seq_kernel_client_ctl);
2429 
2430 /* exported (for OSS emulator) */
2431 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2432 {
2433         struct snd_seq_client *client;
2434 
2435         client = clientptr(clientid);
2436         if (client == NULL)
2437                 return -ENXIO;
2438 
2439         if (! snd_seq_write_pool_allocated(client))
2440                 return 1;
2441         if (snd_seq_pool_poll_wait(client->pool, file, wait))
2442                 return 1;
2443         return 0;
2444 }
2445 
2446 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll);
2447 
2448 /*---------------------------------------------------------------------------*/
2449 
2450 #ifdef CONFIG_PROC_FS
2451 /*
2452  *  /proc interface
2453  */
2454 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer,
2455                                           struct snd_seq_port_subs_info *group,
2456                                           int is_src, char *msg)
2457 {
2458         struct list_head *p;
2459         struct snd_seq_subscribers *s;
2460         int count = 0;
2461 
2462         down_read(&group->list_mutex);
2463         if (list_empty(&group->list_head)) {
2464                 up_read(&group->list_mutex);
2465                 return;
2466         }
2467         snd_iprintf(buffer, msg);
2468         list_for_each(p, &group->list_head) {
2469                 if (is_src)
2470                         s = list_entry(p, struct snd_seq_subscribers, src_list);
2471                 else
2472                         s = list_entry(p, struct snd_seq_subscribers, dest_list);
2473                 if (count++)
2474                         snd_iprintf(buffer, ", ");
2475                 snd_iprintf(buffer, "%d:%d",
2476                             is_src ? s->info.dest.client : s->info.sender.client,
2477                             is_src ? s->info.dest.port : s->info.sender.port);
2478                 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
2479                         snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
2480                 if (group->exclusive)
2481                         snd_iprintf(buffer, "[ex]");
2482         }
2483         up_read(&group->list_mutex);
2484         snd_iprintf(buffer, "\n");
2485 }
2486 
2487 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
2488 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
2489 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
2490 
2491 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2492 
2493 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
2494                                     struct snd_seq_client *client)
2495 {
2496         struct snd_seq_client_port *p;
2497 
2498         mutex_lock(&client->ports_mutex);
2499         list_for_each_entry(p, &client->ports_list_head, list) {
2500                 snd_iprintf(buffer, "  Port %3d : \"%s\" (%c%c%c%c)\n",
2501                             p->addr.port, p->name,
2502                             FLAG_PERM_RD(p->capability),
2503                             FLAG_PERM_WR(p->capability),
2504                             FLAG_PERM_EX(p->capability),
2505                             FLAG_PERM_DUPLEX(p->capability));
2506                 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, "    Connecting To: ");
2507                 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, "    Connected From: ");
2508         }
2509         mutex_unlock(&client->ports_mutex);
2510 }
2511 
2512 
2513 /* exported to seq_info.c */
2514 void snd_seq_info_clients_read(struct snd_info_entry *entry, 
2515                                struct snd_info_buffer *buffer)
2516 {
2517         int c;
2518         struct snd_seq_client *client;
2519 
2520         snd_iprintf(buffer, "Client info\n");
2521         snd_iprintf(buffer, "  cur  clients : %d\n", client_usage.cur);
2522         snd_iprintf(buffer, "  peak clients : %d\n", client_usage.peak);
2523         snd_iprintf(buffer, "  max  clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
2524         snd_iprintf(buffer, "\n");
2525 
2526         /* list the client table */
2527         for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2528                 client = snd_seq_client_use_ptr(c);
2529                 if (client == NULL)
2530                         continue;
2531                 if (client->type == NO_CLIENT) {
2532                         snd_seq_client_unlock(client);
2533                         continue;
2534                 }
2535 
2536                 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n",
2537                             c, client->name,
2538                             client->type == USER_CLIENT ? "User" : "Kernel");
2539                 snd_seq_info_dump_ports(buffer, client);
2540                 if (snd_seq_write_pool_allocated(client)) {
2541                         snd_iprintf(buffer, "  Output pool :\n");
2542                         snd_seq_info_pool(buffer, client->pool, "    ");
2543                 }
2544                 if (client->type == USER_CLIENT && client->data.user.fifo &&
2545                     client->data.user.fifo->pool) {
2546                         snd_iprintf(buffer, "  Input pool :\n");
2547                         snd_seq_info_pool(buffer, client->data.user.fifo->pool, "    ");
2548                 }
2549                 snd_seq_client_unlock(client);
2550         }
2551 }
2552 #endif /* CONFIG_PROC_FS */
2553 
2554 /*---------------------------------------------------------------------------*/
2555 
2556 
2557 /*
2558  *  REGISTRATION PART
2559  */
2560 
2561 static const struct file_operations snd_seq_f_ops =
2562 {
2563         .owner =        THIS_MODULE,
2564         .read =         snd_seq_read,
2565         .write =        snd_seq_write,
2566         .open =         snd_seq_open,
2567         .release =      snd_seq_release,
2568         .llseek =       no_llseek,
2569         .poll =         snd_seq_poll,
2570         .unlocked_ioctl =       snd_seq_ioctl,
2571         .compat_ioctl = snd_seq_ioctl_compat,
2572 };
2573 
2574 /* 
2575  * register sequencer device 
2576  */
2577 int __init snd_sequencer_device_init(void)
2578 {
2579         int err;
2580 
2581         if (mutex_lock_interruptible(&register_mutex))
2582                 return -ERESTARTSYS;
2583 
2584         if ((err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
2585                                        &snd_seq_f_ops, NULL, "seq")) < 0) {
2586                 mutex_unlock(&register_mutex);
2587                 return err;
2588         }
2589         
2590         mutex_unlock(&register_mutex);
2591 
2592         return 0;
2593 }
2594 
2595 
2596 
2597 /* 
2598  * unregister sequencer device 
2599  */
2600 void __exit snd_sequencer_device_done(void)
2601 {
2602         snd_unregister_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0);
2603 }
2604 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp