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

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  1 /*
  2  *  ALSA sequencer Client Manager
  3  *  Copyright (c) 1998-2001 by Frank van de Pol <fvdpol@coil.demon.nl>
  4  *                             Jaroslav Kysela <perex@perex.cz>
  5  *                             Takashi Iwai <tiwai@suse.de>
  6  *
  7  *
  8  *   This program is free software; you can redistribute it and/or modify
  9  *   it under the terms of the GNU General Public License as published by
 10  *   the Free Software Foundation; either version 2 of the License, or
 11  *   (at your option) any later version.
 12  *
 13  *   This program is distributed in the hope that it will be useful,
 14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 16  *   GNU General Public License for more details.
 17  *
 18  *   You should have received a copy of the GNU General Public License
 19  *   along with this program; if not, write to the Free Software
 20  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 21  *
 22  */
 23 
 24 #include <linux/init.h>
 25 #include <linux/export.h>
 26 #include <linux/slab.h>
 27 #include <sound/core.h>
 28 #include <sound/minors.h>
 29 #include <linux/kmod.h>
 30 
 31 #include <sound/seq_kernel.h>
 32 #include "seq_clientmgr.h"
 33 #include "seq_memory.h"
 34 #include "seq_queue.h"
 35 #include "seq_timer.h"
 36 #include "seq_info.h"
 37 #include "seq_system.h"
 38 #include <sound/seq_device.h>
 39 #ifdef CONFIG_COMPAT
 40 #include <linux/compat.h>
 41 #endif
 42 
 43 /* Client Manager
 44 
 45  * this module handles the connections of userland and kernel clients
 46  * 
 47  */
 48 
 49 /*
 50  * There are four ranges of client numbers (last two shared):
 51  * 0..15: global clients
 52  * 16..127: statically allocated client numbers for cards 0..27
 53  * 128..191: dynamically allocated client numbers for cards 28..31
 54  * 128..191: dynamically allocated client numbers for applications
 55  */
 56 
 57 /* number of kernel non-card clients */
 58 #define SNDRV_SEQ_GLOBAL_CLIENTS        16
 59 /* clients per cards, for static clients */
 60 #define SNDRV_SEQ_CLIENTS_PER_CARD      4
 61 /* dynamically allocated client numbers (both kernel drivers and user space) */
 62 #define SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN 128
 63 
 64 #define SNDRV_SEQ_LFLG_INPUT    0x0001
 65 #define SNDRV_SEQ_LFLG_OUTPUT   0x0002
 66 #define SNDRV_SEQ_LFLG_OPEN     (SNDRV_SEQ_LFLG_INPUT|SNDRV_SEQ_LFLG_OUTPUT)
 67 
 68 static DEFINE_SPINLOCK(clients_lock);
 69 static DEFINE_MUTEX(register_mutex);
 70 
 71 /*
 72  * client table
 73  */
 74 static char clienttablock[SNDRV_SEQ_MAX_CLIENTS];
 75 static struct snd_seq_client *clienttab[SNDRV_SEQ_MAX_CLIENTS];
 76 static struct snd_seq_usage client_usage;
 77 
 78 /*
 79  * prototypes
 80  */
 81 static int bounce_error_event(struct snd_seq_client *client,
 82                               struct snd_seq_event *event,
 83                               int err, int atomic, int hop);
 84 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
 85                                         struct snd_seq_event *event,
 86                                         int filter, int atomic, int hop);
 87 
 88 /*
 89  */
 90 static inline unsigned short snd_seq_file_flags(struct file *file)
 91 {
 92         switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
 93         case FMODE_WRITE:
 94                 return SNDRV_SEQ_LFLG_OUTPUT;
 95         case FMODE_READ:
 96                 return SNDRV_SEQ_LFLG_INPUT;
 97         default:
 98                 return SNDRV_SEQ_LFLG_OPEN;
 99         }
100 }
101 
102 static inline int snd_seq_write_pool_allocated(struct snd_seq_client *client)
103 {
104         return snd_seq_total_cells(client->pool) > 0;
105 }
106 
107 /* return pointer to client structure for specified id */
108 static struct snd_seq_client *clientptr(int clientid)
109 {
110         if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
111                 pr_debug("ALSA: seq: oops. Trying to get pointer to client %d\n",
112                            clientid);
113                 return NULL;
114         }
115         return clienttab[clientid];
116 }
117 
118 struct snd_seq_client *snd_seq_client_use_ptr(int clientid)
119 {
120         unsigned long flags;
121         struct snd_seq_client *client;
122 
123         if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
124                 pr_debug("ALSA: seq: oops. Trying to get pointer to client %d\n",
125                            clientid);
126                 return NULL;
127         }
128         spin_lock_irqsave(&clients_lock, flags);
129         client = clientptr(clientid);
130         if (client)
131                 goto __lock;
132         if (clienttablock[clientid]) {
133                 spin_unlock_irqrestore(&clients_lock, flags);
134                 return NULL;
135         }
136         spin_unlock_irqrestore(&clients_lock, flags);
137 #ifdef CONFIG_MODULES
138         if (!in_interrupt()) {
139                 static char client_requested[SNDRV_SEQ_GLOBAL_CLIENTS];
140                 static char card_requested[SNDRV_CARDS];
141                 if (clientid < SNDRV_SEQ_GLOBAL_CLIENTS) {
142                         int idx;
143                         
144                         if (!client_requested[clientid]) {
145                                 client_requested[clientid] = 1;
146                                 for (idx = 0; idx < 15; idx++) {
147                                         if (seq_client_load[idx] < 0)
148                                                 break;
149                                         if (seq_client_load[idx] == clientid) {
150                                                 request_module("snd-seq-client-%i",
151                                                                clientid);
152                                                 break;
153                                         }
154                                 }
155                         }
156                 } else if (clientid < SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) {
157                         int card = (clientid - SNDRV_SEQ_GLOBAL_CLIENTS) /
158                                 SNDRV_SEQ_CLIENTS_PER_CARD;
159                         if (card < snd_ecards_limit) {
160                                 if (! card_requested[card]) {
161                                         card_requested[card] = 1;
162                                         snd_request_card(card);
163                                 }
164                                 snd_seq_device_load_drivers();
165                         }
166                 }
167                 spin_lock_irqsave(&clients_lock, flags);
168                 client = clientptr(clientid);
169                 if (client)
170                         goto __lock;
171                 spin_unlock_irqrestore(&clients_lock, flags);
172         }
173 #endif
174         return NULL;
175 
176       __lock:
177         snd_use_lock_use(&client->use_lock);
178         spin_unlock_irqrestore(&clients_lock, flags);
179         return client;
180 }
181 
182 static void usage_alloc(struct snd_seq_usage *res, int num)
183 {
184         res->cur += num;
185         if (res->cur > res->peak)
186                 res->peak = res->cur;
187 }
188 
189 static void usage_free(struct snd_seq_usage *res, int num)
190 {
191         res->cur -= num;
192 }
193 
194 /* initialise data structures */
195 int __init client_init_data(void)
196 {
197         /* zap out the client table */
198         memset(&clienttablock, 0, sizeof(clienttablock));
199         memset(&clienttab, 0, sizeof(clienttab));
200         return 0;
201 }
202 
203 
204 static struct snd_seq_client *seq_create_client1(int client_index, int poolsize)
205 {
206         unsigned long flags;
207         int c;
208         struct snd_seq_client *client;
209 
210         /* init client data */
211         client = kzalloc(sizeof(*client), GFP_KERNEL);
212         if (client == NULL)
213                 return NULL;
214         client->pool = snd_seq_pool_new(poolsize);
215         if (client->pool == NULL) {
216                 kfree(client);
217                 return NULL;
218         }
219         client->type = NO_CLIENT;
220         snd_use_lock_init(&client->use_lock);
221         rwlock_init(&client->ports_lock);
222         mutex_init(&client->ports_mutex);
223         INIT_LIST_HEAD(&client->ports_list_head);
224         mutex_init(&client->ioctl_mutex);
225 
226         /* find free slot in the client table */
227         spin_lock_irqsave(&clients_lock, flags);
228         if (client_index < 0) {
229                 for (c = SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN;
230                      c < SNDRV_SEQ_MAX_CLIENTS;
231                      c++) {
232                         if (clienttab[c] || clienttablock[c])
233                                 continue;
234                         clienttab[client->number = c] = client;
235                         spin_unlock_irqrestore(&clients_lock, flags);
236                         return client;
237                 }
238         } else {
239                 if (clienttab[client_index] == NULL && !clienttablock[client_index]) {
240                         clienttab[client->number = client_index] = client;
241                         spin_unlock_irqrestore(&clients_lock, flags);
242                         return client;
243                 }
244         }
245         spin_unlock_irqrestore(&clients_lock, flags);
246         snd_seq_pool_delete(&client->pool);
247         kfree(client);
248         return NULL;    /* no free slot found or busy, return failure code */
249 }
250 
251 
252 static int seq_free_client1(struct snd_seq_client *client)
253 {
254         unsigned long flags;
255 
256         if (!client)
257                 return 0;
258         snd_seq_delete_all_ports(client);
259         snd_seq_queue_client_leave(client->number);
260         spin_lock_irqsave(&clients_lock, flags);
261         clienttablock[client->number] = 1;
262         clienttab[client->number] = NULL;
263         spin_unlock_irqrestore(&clients_lock, flags);
264         snd_use_lock_sync(&client->use_lock);
265         snd_seq_queue_client_termination(client->number);
266         if (client->pool)
267                 snd_seq_pool_delete(&client->pool);
268         spin_lock_irqsave(&clients_lock, flags);
269         clienttablock[client->number] = 0;
270         spin_unlock_irqrestore(&clients_lock, flags);
271         return 0;
272 }
273 
274 
275 static void seq_free_client(struct snd_seq_client * client)
276 {
277         mutex_lock(&register_mutex);
278         switch (client->type) {
279         case NO_CLIENT:
280                 pr_warn("ALSA: seq: Trying to free unused client %d\n",
281                         client->number);
282                 break;
283         case USER_CLIENT:
284         case KERNEL_CLIENT:
285                 seq_free_client1(client);
286                 usage_free(&client_usage, 1);
287                 break;
288 
289         default:
290                 pr_err("ALSA: seq: Trying to free client %d with undefined type = %d\n",
291                            client->number, client->type);
292         }
293         mutex_unlock(&register_mutex);
294 
295         snd_seq_system_client_ev_client_exit(client->number);
296 }
297 
298 
299 
300 /* -------------------------------------------------------- */
301 
302 /* create a user client */
303 static int snd_seq_open(struct inode *inode, struct file *file)
304 {
305         int c, mode;                    /* client id */
306         struct snd_seq_client *client;
307         struct snd_seq_user_client *user;
308         int err;
309 
310         err = nonseekable_open(inode, file);
311         if (err < 0)
312                 return err;
313 
314         if (mutex_lock_interruptible(&register_mutex))
315                 return -ERESTARTSYS;
316         client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS);
317         if (client == NULL) {
318                 mutex_unlock(&register_mutex);
319                 return -ENOMEM; /* failure code */
320         }
321 
322         mode = snd_seq_file_flags(file);
323         if (mode & SNDRV_SEQ_LFLG_INPUT)
324                 client->accept_input = 1;
325         if (mode & SNDRV_SEQ_LFLG_OUTPUT)
326                 client->accept_output = 1;
327 
328         user = &client->data.user;
329         user->fifo = NULL;
330         user->fifo_pool_size = 0;
331 
332         if (mode & SNDRV_SEQ_LFLG_INPUT) {
333                 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS;
334                 user->fifo = snd_seq_fifo_new(user->fifo_pool_size);
335                 if (user->fifo == NULL) {
336                         seq_free_client1(client);
337                         kfree(client);
338                         mutex_unlock(&register_mutex);
339                         return -ENOMEM;
340                 }
341         }
342 
343         usage_alloc(&client_usage, 1);
344         client->type = USER_CLIENT;
345         mutex_unlock(&register_mutex);
346 
347         c = client->number;
348         file->private_data = client;
349 
350         /* fill client data */
351         user->file = file;
352         sprintf(client->name, "Client-%d", c);
353         client->data.user.owner = get_pid(task_pid(current));
354 
355         /* make others aware this new client */
356         snd_seq_system_client_ev_client_start(c);
357 
358         return 0;
359 }
360 
361 /* delete a user client */
362 static int snd_seq_release(struct inode *inode, struct file *file)
363 {
364         struct snd_seq_client *client = file->private_data;
365 
366         if (client) {
367                 seq_free_client(client);
368                 if (client->data.user.fifo)
369                         snd_seq_fifo_delete(&client->data.user.fifo);
370                 put_pid(client->data.user.owner);
371                 kfree(client);
372         }
373 
374         return 0;
375 }
376 
377 
378 /* handle client read() */
379 /* possible error values:
380  *      -ENXIO  invalid client or file open mode
381  *      -ENOSPC FIFO overflow (the flag is cleared after this error report)
382  *      -EINVAL no enough user-space buffer to write the whole event
383  *      -EFAULT seg. fault during copy to user space
384  */
385 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count,
386                             loff_t *offset)
387 {
388         struct snd_seq_client *client = file->private_data;
389         struct snd_seq_fifo *fifo;
390         int err;
391         long result = 0;
392         struct snd_seq_event_cell *cell;
393 
394         if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT))
395                 return -ENXIO;
396 
397         if (!access_ok(VERIFY_WRITE, buf, count))
398                 return -EFAULT;
399 
400         /* check client structures are in place */
401         if (snd_BUG_ON(!client))
402                 return -ENXIO;
403 
404         if (!client->accept_input || (fifo = client->data.user.fifo) == NULL)
405                 return -ENXIO;
406 
407         if (atomic_read(&fifo->overflow) > 0) {
408                 /* buffer overflow is detected */
409                 snd_seq_fifo_clear(fifo);
410                 /* return error code */
411                 return -ENOSPC;
412         }
413 
414         cell = NULL;
415         err = 0;
416         snd_seq_fifo_lock(fifo);
417 
418         /* while data available in queue */
419         while (count >= sizeof(struct snd_seq_event)) {
420                 int nonblock;
421 
422                 nonblock = (file->f_flags & O_NONBLOCK) || result > 0;
423                 if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) {
424                         break;
425                 }
426                 if (snd_seq_ev_is_variable(&cell->event)) {
427                         struct snd_seq_event tmpev;
428                         tmpev = cell->event;
429                         tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
430                         if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) {
431                                 err = -EFAULT;
432                                 break;
433                         }
434                         count -= sizeof(struct snd_seq_event);
435                         buf += sizeof(struct snd_seq_event);
436                         err = snd_seq_expand_var_event(&cell->event, count,
437                                                        (char __force *)buf, 0,
438                                                        sizeof(struct snd_seq_event));
439                         if (err < 0)
440                                 break;
441                         result += err;
442                         count -= err;
443                         buf += err;
444                 } else {
445                         if (copy_to_user(buf, &cell->event, sizeof(struct snd_seq_event))) {
446                                 err = -EFAULT;
447                                 break;
448                         }
449                         count -= sizeof(struct snd_seq_event);
450                         buf += sizeof(struct snd_seq_event);
451                 }
452                 snd_seq_cell_free(cell);
453                 cell = NULL; /* to be sure */
454                 result += sizeof(struct snd_seq_event);
455         }
456 
457         if (err < 0) {
458                 if (cell)
459                         snd_seq_fifo_cell_putback(fifo, cell);
460                 if (err == -EAGAIN && result > 0)
461                         err = 0;
462         }
463         snd_seq_fifo_unlock(fifo);
464 
465         return (err < 0) ? err : result;
466 }
467 
468 
469 /*
470  * check access permission to the port
471  */
472 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags)
473 {
474         if ((port->capability & flags) != flags)
475                 return 0;
476         return flags;
477 }
478 
479 /*
480  * check if the destination client is available, and return the pointer
481  * if filter is non-zero, client filter bitmap is tested.
482  */
483 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event,
484                                                     int filter)
485 {
486         struct snd_seq_client *dest;
487 
488         dest = snd_seq_client_use_ptr(event->dest.client);
489         if (dest == NULL)
490                 return NULL;
491         if (! dest->accept_input)
492                 goto __not_avail;
493         if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) &&
494             ! test_bit(event->type, dest->event_filter))
495                 goto __not_avail;
496         if (filter && !(dest->filter & filter))
497                 goto __not_avail;
498 
499         return dest; /* ok - accessible */
500 __not_avail:
501         snd_seq_client_unlock(dest);
502         return NULL;
503 }
504 
505 
506 /*
507  * Return the error event.
508  *
509  * If the receiver client is a user client, the original event is
510  * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event.  If
511  * the original event is also variable length, the external data is
512  * copied after the event record. 
513  * If the receiver client is a kernel client, the original event is
514  * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra
515  * kmalloc.
516  */
517 static int bounce_error_event(struct snd_seq_client *client,
518                               struct snd_seq_event *event,
519                               int err, int atomic, int hop)
520 {
521         struct snd_seq_event bounce_ev;
522         int result;
523 
524         if (client == NULL ||
525             ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) ||
526             ! client->accept_input)
527                 return 0; /* ignored */
528 
529         /* set up quoted error */
530         memset(&bounce_ev, 0, sizeof(bounce_ev));
531         bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR;
532         bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED;
533         bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT;
534         bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
535         bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
536         bounce_ev.dest.client = client->number;
537         bounce_ev.dest.port = event->source.port;
538         bounce_ev.data.quote.origin = event->dest;
539         bounce_ev.data.quote.event = event;
540         bounce_ev.data.quote.value = -err; /* use positive value */
541         result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1);
542         if (result < 0) {
543                 client->event_lost++;
544                 return result;
545         }
546 
547         return result;
548 }
549 
550 
551 /*
552  * rewrite the time-stamp of the event record with the curren time
553  * of the given queue.
554  * return non-zero if updated.
555  */
556 static int update_timestamp_of_queue(struct snd_seq_event *event,
557                                      int queue, int real_time)
558 {
559         struct snd_seq_queue *q;
560 
561         q = queueptr(queue);
562         if (! q)
563                 return 0;
564         event->queue = queue;
565         event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK;
566         if (real_time) {
567                 event->time.time = snd_seq_timer_get_cur_time(q->timer);
568                 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL;
569         } else {
570                 event->time.tick = snd_seq_timer_get_cur_tick(q->timer);
571                 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK;
572         }
573         queuefree(q);
574         return 1;
575 }
576 
577 
578 /*
579  * deliver an event to the specified destination.
580  * if filter is non-zero, client filter bitmap is tested.
581  *
582  *  RETURN VALUE: 0 : if succeeded
583  *               <0 : error
584  */
585 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
586                                         struct snd_seq_event *event,
587                                         int filter, int atomic, int hop)
588 {
589         struct snd_seq_client *dest = NULL;
590         struct snd_seq_client_port *dest_port = NULL;
591         int result = -ENOENT;
592         int direct;
593 
594         direct = snd_seq_ev_is_direct(event);
595 
596         dest = get_event_dest_client(event, filter);
597         if (dest == NULL)
598                 goto __skip;
599         dest_port = snd_seq_port_use_ptr(dest, event->dest.port);
600         if (dest_port == NULL)
601                 goto __skip;
602 
603         /* check permission */
604         if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) {
605                 result = -EPERM;
606                 goto __skip;
607         }
608                 
609         if (dest_port->timestamping)
610                 update_timestamp_of_queue(event, dest_port->time_queue,
611                                           dest_port->time_real);
612 
613         switch (dest->type) {
614         case USER_CLIENT:
615                 if (dest->data.user.fifo)
616                         result = snd_seq_fifo_event_in(dest->data.user.fifo, event);
617                 break;
618 
619         case KERNEL_CLIENT:
620                 if (dest_port->event_input == NULL)
621                         break;
622                 result = dest_port->event_input(event, direct,
623                                                 dest_port->private_data,
624                                                 atomic, hop);
625                 break;
626         default:
627                 break;
628         }
629 
630   __skip:
631         if (dest_port)
632                 snd_seq_port_unlock(dest_port);
633         if (dest)
634                 snd_seq_client_unlock(dest);
635 
636         if (result < 0 && !direct) {
637                 result = bounce_error_event(client, event, result, atomic, hop);
638         }
639         return result;
640 }
641 
642 
643 /*
644  * send the event to all subscribers:
645  */
646 static int deliver_to_subscribers(struct snd_seq_client *client,
647                                   struct snd_seq_event *event,
648                                   int atomic, int hop)
649 {
650         struct snd_seq_subscribers *subs;
651         int err, result = 0, num_ev = 0;
652         struct snd_seq_event event_saved;
653         struct snd_seq_client_port *src_port;
654         struct snd_seq_port_subs_info *grp;
655 
656         src_port = snd_seq_port_use_ptr(client, event->source.port);
657         if (src_port == NULL)
658                 return -EINVAL; /* invalid source port */
659         /* save original event record */
660         event_saved = *event;
661         grp = &src_port->c_src;
662         
663         /* lock list */
664         if (atomic)
665                 read_lock(&grp->list_lock);
666         else
667                 down_read_nested(&grp->list_mutex, hop);
668         list_for_each_entry(subs, &grp->list_head, src_list) {
669                 /* both ports ready? */
670                 if (atomic_read(&subs->ref_count) != 2)
671                         continue;
672                 event->dest = subs->info.dest;
673                 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
674                         /* convert time according to flag with subscription */
675                         update_timestamp_of_queue(event, subs->info.queue,
676                                                   subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL);
677                 err = snd_seq_deliver_single_event(client, event,
678                                                    0, atomic, hop);
679                 if (err < 0) {
680                         /* save first error that occurs and continue */
681                         if (!result)
682                                 result = err;
683                         continue;
684                 }
685                 num_ev++;
686                 /* restore original event record */
687                 *event = event_saved;
688         }
689         if (atomic)
690                 read_unlock(&grp->list_lock);
691         else
692                 up_read(&grp->list_mutex);
693         *event = event_saved; /* restore */
694         snd_seq_port_unlock(src_port);
695         return (result < 0) ? result : num_ev;
696 }
697 
698 
699 #ifdef SUPPORT_BROADCAST 
700 /*
701  * broadcast to all ports:
702  */
703 static int port_broadcast_event(struct snd_seq_client *client,
704                                 struct snd_seq_event *event,
705                                 int atomic, int hop)
706 {
707         int num_ev = 0, err, result = 0;
708         struct snd_seq_client *dest_client;
709         struct snd_seq_client_port *port;
710 
711         dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST);
712         if (dest_client == NULL)
713                 return 0; /* no matching destination */
714 
715         read_lock(&dest_client->ports_lock);
716         list_for_each_entry(port, &dest_client->ports_list_head, list) {
717                 event->dest.port = port->addr.port;
718                 /* pass NULL as source client to avoid error bounce */
719                 err = snd_seq_deliver_single_event(NULL, event,
720                                                    SNDRV_SEQ_FILTER_BROADCAST,
721                                                    atomic, hop);
722                 if (err < 0) {
723                         /* save first error that occurs and continue */
724                         if (!result)
725                                 result = err;
726                         continue;
727                 }
728                 num_ev++;
729         }
730         read_unlock(&dest_client->ports_lock);
731         snd_seq_client_unlock(dest_client);
732         event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */
733         return (result < 0) ? result : num_ev;
734 }
735 
736 /*
737  * send the event to all clients:
738  * if destination port is also ADDRESS_BROADCAST, deliver to all ports.
739  */
740 static int broadcast_event(struct snd_seq_client *client,
741                            struct snd_seq_event *event, int atomic, int hop)
742 {
743         int err, result = 0, num_ev = 0;
744         int dest;
745         struct snd_seq_addr addr;
746 
747         addr = event->dest; /* save */
748 
749         for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) {
750                 /* don't send to itself */
751                 if (dest == client->number)
752                         continue;
753                 event->dest.client = dest;
754                 event->dest.port = addr.port;
755                 if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST)
756                         err = port_broadcast_event(client, event, atomic, hop);
757                 else
758                         /* pass NULL as source client to avoid error bounce */
759                         err = snd_seq_deliver_single_event(NULL, event,
760                                                            SNDRV_SEQ_FILTER_BROADCAST,
761                                                            atomic, hop);
762                 if (err < 0) {
763                         /* save first error that occurs and continue */
764                         if (!result)
765                                 result = err;
766                         continue;
767                 }
768                 num_ev += err;
769         }
770         event->dest = addr; /* restore */
771         return (result < 0) ? result : num_ev;
772 }
773 
774 
775 /* multicast - not supported yet */
776 static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event,
777                            int atomic, int hop)
778 {
779         pr_debug("ALSA: seq: multicast not supported yet.\n");
780         return 0; /* ignored */
781 }
782 #endif /* SUPPORT_BROADCAST */
783 
784 
785 /* deliver an event to the destination port(s).
786  * if the event is to subscribers or broadcast, the event is dispatched
787  * to multiple targets.
788  *
789  * RETURN VALUE: n > 0  : the number of delivered events.
790  *               n == 0 : the event was not passed to any client.
791  *               n < 0  : error - event was not processed.
792  */
793 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event,
794                                  int atomic, int hop)
795 {
796         int result;
797 
798         hop++;
799         if (hop >= SNDRV_SEQ_MAX_HOPS) {
800                 pr_debug("ALSA: seq: too long delivery path (%d:%d->%d:%d)\n",
801                            event->source.client, event->source.port,
802                            event->dest.client, event->dest.port);
803                 return -EMLINK;
804         }
805 
806         if (snd_seq_ev_is_variable(event) &&
807             snd_BUG_ON(atomic && (event->data.ext.len & SNDRV_SEQ_EXT_USRPTR)))
808                 return -EINVAL;
809 
810         if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS ||
811             event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS)
812                 result = deliver_to_subscribers(client, event, atomic, hop);
813 #ifdef SUPPORT_BROADCAST
814         else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST ||
815                  event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST)
816                 result = broadcast_event(client, event, atomic, hop);
817         else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS)
818                 result = multicast_event(client, event, atomic, hop);
819         else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST)
820                 result = port_broadcast_event(client, event, atomic, hop);
821 #endif
822         else
823                 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop);
824 
825         return result;
826 }
827 
828 /*
829  * dispatch an event cell:
830  * This function is called only from queue check routines in timer
831  * interrupts or after enqueued.
832  * The event cell shall be released or re-queued in this function.
833  *
834  * RETURN VALUE: n > 0  : the number of delivered events.
835  *               n == 0 : the event was not passed to any client.
836  *               n < 0  : error - event was not processed.
837  */
838 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop)
839 {
840         struct snd_seq_client *client;
841         int result;
842 
843         if (snd_BUG_ON(!cell))
844                 return -EINVAL;
845 
846         client = snd_seq_client_use_ptr(cell->event.source.client);
847         if (client == NULL) {
848                 snd_seq_cell_free(cell); /* release this cell */
849                 return -EINVAL;
850         }
851 
852         if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) {
853                 /* NOTE event:
854                  * the event cell is re-used as a NOTE-OFF event and
855                  * enqueued again.
856                  */
857                 struct snd_seq_event tmpev, *ev;
858 
859                 /* reserve this event to enqueue note-off later */
860                 tmpev = cell->event;
861                 tmpev.type = SNDRV_SEQ_EVENT_NOTEON;
862                 result = snd_seq_deliver_event(client, &tmpev, atomic, hop);
863 
864                 /*
865                  * This was originally a note event.  We now re-use the
866                  * cell for the note-off event.
867                  */
868 
869                 ev = &cell->event;
870                 ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
871                 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH;
872 
873                 /* add the duration time */
874                 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) {
875                 case SNDRV_SEQ_TIME_STAMP_TICK:
876                         ev->time.tick += ev->data.note.duration;
877                         break;
878                 case SNDRV_SEQ_TIME_STAMP_REAL:
879                         /* unit for duration is ms */
880                         ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000);
881                         ev->time.time.tv_sec += ev->data.note.duration / 1000 +
882                                                 ev->time.time.tv_nsec / 1000000000;
883                         ev->time.time.tv_nsec %= 1000000000;
884                         break;
885                 }
886                 ev->data.note.velocity = ev->data.note.off_velocity;
887 
888                 /* Now queue this cell as the note off event */
889                 if (snd_seq_enqueue_event(cell, atomic, hop) < 0)
890                         snd_seq_cell_free(cell); /* release this cell */
891 
892         } else {
893                 /* Normal events:
894                  * event cell is freed after processing the event
895                  */
896 
897                 result = snd_seq_deliver_event(client, &cell->event, atomic, hop);
898                 snd_seq_cell_free(cell);
899         }
900 
901         snd_seq_client_unlock(client);
902         return result;
903 }
904 
905 
906 /* Allocate a cell from client pool and enqueue it to queue:
907  * if pool is empty and blocking is TRUE, sleep until a new cell is
908  * available.
909  */
910 static int snd_seq_client_enqueue_event(struct snd_seq_client *client,
911                                         struct snd_seq_event *event,
912                                         struct file *file, int blocking,
913                                         int atomic, int hop)
914 {
915         struct snd_seq_event_cell *cell;
916         int err;
917 
918         /* special queue values - force direct passing */
919         if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
920                 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
921                 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
922         } else
923 #ifdef SUPPORT_BROADCAST
924                 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) {
925                         event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST;
926                         event->queue = SNDRV_SEQ_QUEUE_DIRECT;
927                 }
928 #endif
929         if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
930                 /* check presence of source port */
931                 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port);
932                 if (src_port == NULL)
933                         return -EINVAL;
934                 snd_seq_port_unlock(src_port);
935         }
936 
937         /* direct event processing without enqueued */
938         if (snd_seq_ev_is_direct(event)) {
939                 if (event->type == SNDRV_SEQ_EVENT_NOTE)
940                         return -EINVAL; /* this event must be enqueued! */
941                 return snd_seq_deliver_event(client, event, atomic, hop);
942         }
943 
944         /* Not direct, normal queuing */
945         if (snd_seq_queue_is_used(event->queue, client->number) <= 0)
946                 return -EINVAL;  /* invalid queue */
947         if (! snd_seq_write_pool_allocated(client))
948                 return -ENXIO; /* queue is not allocated */
949 
950         /* allocate an event cell */
951         err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, file);
952         if (err < 0)
953                 return err;
954 
955         /* we got a cell. enqueue it. */
956         if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
957                 snd_seq_cell_free(cell);
958                 return err;
959         }
960 
961         return 0;
962 }
963 
964 
965 /*
966  * check validity of event type and data length.
967  * return non-zero if invalid.
968  */
969 static int check_event_type_and_length(struct snd_seq_event *ev)
970 {
971         switch (snd_seq_ev_length_type(ev)) {
972         case SNDRV_SEQ_EVENT_LENGTH_FIXED:
973                 if (snd_seq_ev_is_variable_type(ev))
974                         return -EINVAL;
975                 break;
976         case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
977                 if (! snd_seq_ev_is_variable_type(ev) ||
978                     (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
979                         return -EINVAL;
980                 break;
981         case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
982                 if (! snd_seq_ev_is_direct(ev))
983                         return -EINVAL;
984                 break;
985         }
986         return 0;
987 }
988 
989 
990 /* handle write() */
991 /* possible error values:
992  *      -ENXIO  invalid client or file open mode
993  *      -ENOMEM malloc failed
994  *      -EFAULT seg. fault during copy from user space
995  *      -EINVAL invalid event
996  *      -EAGAIN no space in output pool
997  *      -EINTR  interrupts while sleep
998  *      -EMLINK too many hops
999  *      others  depends on return value from driver callback
1000  */
1001 static ssize_t snd_seq_write(struct file *file, const char __user *buf,
1002                              size_t count, loff_t *offset)
1003 {
1004         struct snd_seq_client *client = file->private_data;
1005         int written = 0, len;
1006         int err;
1007         struct snd_seq_event event;
1008 
1009         if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
1010                 return -ENXIO;
1011 
1012         /* check client structures are in place */
1013         if (snd_BUG_ON(!client))
1014                 return -ENXIO;
1015                 
1016         if (!client->accept_output || client->pool == NULL)
1017                 return -ENXIO;
1018 
1019         /* allocate the pool now if the pool is not allocated yet */ 
1020         if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
1021                 mutex_lock(&client->ioctl_mutex);
1022                 err = snd_seq_pool_init(client->pool);
1023                 mutex_unlock(&client->ioctl_mutex);
1024                 if (err < 0)
1025                         return -ENOMEM;
1026         }
1027 
1028         /* only process whole events */
1029         err = -EINVAL;
1030         while (count >= sizeof(struct snd_seq_event)) {
1031                 /* Read in the event header from the user */
1032                 len = sizeof(event);
1033                 if (copy_from_user(&event, buf, len)) {
1034                         err = -EFAULT;
1035                         break;
1036                 }
1037                 event.source.client = client->number;   /* fill in client number */
1038                 /* Check for extension data length */
1039                 if (check_event_type_and_length(&event)) {
1040                         err = -EINVAL;
1041                         break;
1042                 }
1043 
1044                 /* check for special events */
1045                 if (event.type == SNDRV_SEQ_EVENT_NONE)
1046                         goto __skip_event;
1047                 else if (snd_seq_ev_is_reserved(&event)) {
1048                         err = -EINVAL;
1049                         break;
1050                 }
1051 
1052                 if (snd_seq_ev_is_variable(&event)) {
1053                         int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK;
1054                         if ((size_t)(extlen + len) > count) {
1055                                 /* back out, will get an error this time or next */
1056                                 err = -EINVAL;
1057                                 break;
1058                         }
1059                         /* set user space pointer */
1060                         event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
1061                         event.data.ext.ptr = (char __force *)buf
1062                                                 + sizeof(struct snd_seq_event);
1063                         len += extlen; /* increment data length */
1064                 } else {
1065 #ifdef CONFIG_COMPAT
1066                         if (client->convert32 && snd_seq_ev_is_varusr(&event)) {
1067                                 void *ptr = (void __force *)compat_ptr(event.data.raw32.d[1]);
1068                                 event.data.ext.ptr = ptr;
1069                         }
1070 #endif
1071                 }
1072 
1073                 /* ok, enqueue it */
1074                 err = snd_seq_client_enqueue_event(client, &event, file,
1075                                                    !(file->f_flags & O_NONBLOCK),
1076                                                    0, 0);
1077                 if (err < 0)
1078                         break;
1079 
1080         __skip_event:
1081                 /* Update pointers and counts */
1082                 count -= len;
1083                 buf += len;
1084                 written += len;
1085         }
1086 
1087         return written ? written : err;
1088 }
1089 
1090 
1091 /*
1092  * handle polling
1093  */
1094 static __poll_t snd_seq_poll(struct file *file, poll_table * wait)
1095 {
1096         struct snd_seq_client *client = file->private_data;
1097         __poll_t mask = 0;
1098 
1099         /* check client structures are in place */
1100         if (snd_BUG_ON(!client))
1101                 return -ENXIO;
1102 
1103         if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1104             client->data.user.fifo) {
1105 
1106                 /* check if data is available in the outqueue */
1107                 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
1108                         mask |= EPOLLIN | EPOLLRDNORM;
1109         }
1110 
1111         if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1112 
1113                 /* check if data is available in the pool */
1114                 if (!snd_seq_write_pool_allocated(client) ||
1115                     snd_seq_pool_poll_wait(client->pool, file, wait))
1116                         mask |= EPOLLOUT | EPOLLWRNORM;
1117         }
1118 
1119         return mask;
1120 }
1121 
1122 
1123 /*-----------------------------------------------------*/
1124 
1125 static int snd_seq_ioctl_pversion(struct snd_seq_client *client, void *arg)
1126 {
1127         int *pversion = arg;
1128 
1129         *pversion = SNDRV_SEQ_VERSION;
1130         return 0;
1131 }
1132 
1133 static int snd_seq_ioctl_client_id(struct snd_seq_client *client, void *arg)
1134 {
1135         int *client_id = arg;
1136 
1137         *client_id = client->number;
1138         return 0;
1139 }
1140 
1141 /* SYSTEM_INFO ioctl() */
1142 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void *arg)
1143 {
1144         struct snd_seq_system_info *info = arg;
1145 
1146         memset(info, 0, sizeof(*info));
1147         /* fill the info fields */
1148         info->queues = SNDRV_SEQ_MAX_QUEUES;
1149         info->clients = SNDRV_SEQ_MAX_CLIENTS;
1150         info->ports = SNDRV_SEQ_MAX_PORTS;
1151         info->channels = 256;   /* fixed limit */
1152         info->cur_clients = client_usage.cur;
1153         info->cur_queues = snd_seq_queue_get_cur_queues();
1154 
1155         return 0;
1156 }
1157 
1158 
1159 /* RUNNING_MODE ioctl() */
1160 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void  *arg)
1161 {
1162         struct snd_seq_running_info *info = arg;
1163         struct snd_seq_client *cptr;
1164         int err = 0;
1165 
1166         /* requested client number */
1167         cptr = snd_seq_client_use_ptr(info->client);
1168         if (cptr == NULL)
1169                 return -ENOENT;         /* don't change !!! */
1170 
1171 #ifdef SNDRV_BIG_ENDIAN
1172         if (!info->big_endian) {
1173                 err = -EINVAL;
1174                 goto __err;
1175         }
1176 #else
1177         if (info->big_endian) {
1178                 err = -EINVAL;
1179                 goto __err;
1180         }
1181 
1182 #endif
1183         if (info->cpu_mode > sizeof(long)) {
1184                 err = -EINVAL;
1185                 goto __err;
1186         }
1187         cptr->convert32 = (info->cpu_mode < sizeof(long));
1188  __err:
1189         snd_seq_client_unlock(cptr);
1190         return err;
1191 }
1192 
1193 /* CLIENT_INFO ioctl() */
1194 static void get_client_info(struct snd_seq_client *cptr,
1195                             struct snd_seq_client_info *info)
1196 {
1197         info->client = cptr->number;
1198 
1199         /* fill the info fields */
1200         info->type = cptr->type;
1201         strcpy(info->name, cptr->name);
1202         info->filter = cptr->filter;
1203         info->event_lost = cptr->event_lost;
1204         memcpy(info->event_filter, cptr->event_filter, 32);
1205         info->num_ports = cptr->num_ports;
1206 
1207         if (cptr->type == USER_CLIENT)
1208                 info->pid = pid_vnr(cptr->data.user.owner);
1209         else
1210                 info->pid = -1;
1211 
1212         if (cptr->type == KERNEL_CLIENT)
1213                 info->card = cptr->data.kernel.card ? cptr->data.kernel.card->number : -1;
1214         else
1215                 info->card = -1;
1216 
1217         memset(info->reserved, 0, sizeof(info->reserved));
1218 }
1219 
1220 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
1221                                          void *arg)
1222 {
1223         struct snd_seq_client_info *client_info = arg;
1224         struct snd_seq_client *cptr;
1225 
1226         /* requested client number */
1227         cptr = snd_seq_client_use_ptr(client_info->client);
1228         if (cptr == NULL)
1229                 return -ENOENT;         /* don't change !!! */
1230 
1231         get_client_info(cptr, client_info);
1232         snd_seq_client_unlock(cptr);
1233 
1234         return 0;
1235 }
1236 
1237 
1238 /* CLIENT_INFO ioctl() */
1239 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
1240                                          void *arg)
1241 {
1242         struct snd_seq_client_info *client_info = arg;
1243 
1244         /* it is not allowed to set the info fields for an another client */
1245         if (client->number != client_info->client)
1246                 return -EPERM;
1247         /* also client type must be set now */
1248         if (client->type != client_info->type)
1249                 return -EINVAL;
1250 
1251         /* fill the info fields */
1252         if (client_info->name[0])
1253                 strlcpy(client->name, client_info->name, sizeof(client->name));
1254 
1255         client->filter = client_info->filter;
1256         client->event_lost = client_info->event_lost;
1257         memcpy(client->event_filter, client_info->event_filter, 32);
1258 
1259         return 0;
1260 }
1261 
1262 
1263 /* 
1264  * CREATE PORT ioctl() 
1265  */
1266 static int snd_seq_ioctl_create_port(struct snd_seq_client *client, void *arg)
1267 {
1268         struct snd_seq_port_info *info = arg;
1269         struct snd_seq_client_port *port;
1270         struct snd_seq_port_callback *callback;
1271         int port_idx;
1272 
1273         /* it is not allowed to create the port for an another client */
1274         if (info->addr.client != client->number)
1275                 return -EPERM;
1276 
1277         port = snd_seq_create_port(client, (info->flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info->addr.port : -1);
1278         if (port == NULL)
1279                 return -ENOMEM;
1280 
1281         if (client->type == USER_CLIENT && info->kernel) {
1282                 port_idx = port->addr.port;
1283                 snd_seq_port_unlock(port);
1284                 snd_seq_delete_port(client, port_idx);
1285                 return -EINVAL;
1286         }
1287         if (client->type == KERNEL_CLIENT) {
1288                 if ((callback = info->kernel) != NULL) {
1289                         if (callback->owner)
1290                                 port->owner = callback->owner;
1291                         port->private_data = callback->private_data;
1292                         port->private_free = callback->private_free;
1293                         port->event_input = callback->event_input;
1294                         port->c_src.open = callback->subscribe;
1295                         port->c_src.close = callback->unsubscribe;
1296                         port->c_dest.open = callback->use;
1297                         port->c_dest.close = callback->unuse;
1298                 }
1299         }
1300 
1301         info->addr = port->addr;
1302 
1303         snd_seq_set_port_info(port, info);
1304         snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1305         snd_seq_port_unlock(port);
1306 
1307         return 0;
1308 }
1309 
1310 /* 
1311  * DELETE PORT ioctl() 
1312  */
1313 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client, void *arg)
1314 {
1315         struct snd_seq_port_info *info = arg;
1316         int err;
1317 
1318         /* it is not allowed to remove the port for an another client */
1319         if (info->addr.client != client->number)
1320                 return -EPERM;
1321 
1322         err = snd_seq_delete_port(client, info->addr.port);
1323         if (err >= 0)
1324                 snd_seq_system_client_ev_port_exit(client->number, info->addr.port);
1325         return err;
1326 }
1327 
1328 
1329 /* 
1330  * GET_PORT_INFO ioctl() (on any client) 
1331  */
1332 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client, void *arg)
1333 {
1334         struct snd_seq_port_info *info = arg;
1335         struct snd_seq_client *cptr;
1336         struct snd_seq_client_port *port;
1337 
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         return 0;
1354 }
1355 
1356 
1357 /* 
1358  * SET_PORT_INFO ioctl() (only ports on this/own client) 
1359  */
1360 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client, void *arg)
1361 {
1362         struct snd_seq_port_info *info = arg;
1363         struct snd_seq_client_port *port;
1364 
1365         if (info->addr.client != client->number) /* only set our own ports ! */
1366                 return -EPERM;
1367         port = snd_seq_port_use_ptr(client, info->addr.port);
1368         if (port) {
1369                 snd_seq_set_port_info(port, info);
1370                 snd_seq_port_unlock(port);
1371         }
1372         return 0;
1373 }
1374 
1375 
1376 /*
1377  * port subscription (connection)
1378  */
1379 #define PERM_RD         (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1380 #define PERM_WR         (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1381 
1382 static int check_subscription_permission(struct snd_seq_client *client,
1383                                          struct snd_seq_client_port *sport,
1384                                          struct snd_seq_client_port *dport,
1385                                          struct snd_seq_port_subscribe *subs)
1386 {
1387         if (client->number != subs->sender.client &&
1388             client->number != subs->dest.client) {
1389                 /* connection by third client - check export permission */
1390                 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1391                         return -EPERM;
1392                 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1393                         return -EPERM;
1394         }
1395 
1396         /* check read permission */
1397         /* if sender or receiver is the subscribing client itself,
1398          * no permission check is necessary
1399          */
1400         if (client->number != subs->sender.client) {
1401                 if (! check_port_perm(sport, PERM_RD))
1402                         return -EPERM;
1403         }
1404         /* check write permission */
1405         if (client->number != subs->dest.client) {
1406                 if (! check_port_perm(dport, PERM_WR))
1407                         return -EPERM;
1408         }
1409         return 0;
1410 }
1411 
1412 /*
1413  * send an subscription notify event to user client:
1414  * client must be user client.
1415  */
1416 int snd_seq_client_notify_subscription(int client, int port,
1417                                        struct snd_seq_port_subscribe *info,
1418                                        int evtype)
1419 {
1420         struct snd_seq_event event;
1421 
1422         memset(&event, 0, sizeof(event));
1423         event.type = evtype;
1424         event.data.connect.dest = info->dest;
1425         event.data.connect.sender = info->sender;
1426 
1427         return snd_seq_system_notify(client, port, &event);  /* non-atomic */
1428 }
1429 
1430 
1431 /* 
1432  * add to port's subscription list IOCTL interface 
1433  */
1434 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
1435                                         void *arg)
1436 {
1437         struct snd_seq_port_subscribe *subs = arg;
1438         int result = -EINVAL;
1439         struct snd_seq_client *receiver = NULL, *sender = NULL;
1440         struct snd_seq_client_port *sport = NULL, *dport = NULL;
1441 
1442         if ((receiver = snd_seq_client_use_ptr(subs->dest.client)) == NULL)
1443                 goto __end;
1444         if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1445                 goto __end;
1446         if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1447                 goto __end;
1448         if ((dport = snd_seq_port_use_ptr(receiver, subs->dest.port)) == NULL)
1449                 goto __end;
1450 
1451         result = check_subscription_permission(client, sport, dport, subs);
1452         if (result < 0)
1453                 goto __end;
1454 
1455         /* connect them */
1456         result = snd_seq_port_connect(client, sender, sport, receiver, dport, subs);
1457         if (! result) /* broadcast announce */
1458                 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1459                                                    subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1460       __end:
1461         if (sport)
1462                 snd_seq_port_unlock(sport);
1463         if (dport)
1464                 snd_seq_port_unlock(dport);
1465         if (sender)
1466                 snd_seq_client_unlock(sender);
1467         if (receiver)
1468                 snd_seq_client_unlock(receiver);
1469         return result;
1470 }
1471 
1472 
1473 /* 
1474  * remove from port's subscription list 
1475  */
1476 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
1477                                           void *arg)
1478 {
1479         struct snd_seq_port_subscribe *subs = arg;
1480         int result = -ENXIO;
1481         struct snd_seq_client *receiver = NULL, *sender = NULL;
1482         struct snd_seq_client_port *sport = NULL, *dport = NULL;
1483 
1484         if ((receiver = snd_seq_client_use_ptr(subs->dest.client)) == NULL)
1485                 goto __end;
1486         if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1487                 goto __end;
1488         if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1489                 goto __end;
1490         if ((dport = snd_seq_port_use_ptr(receiver, subs->dest.port)) == NULL)
1491                 goto __end;
1492 
1493         result = check_subscription_permission(client, sport, dport, subs);
1494         if (result < 0)
1495                 goto __end;
1496 
1497         result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, subs);
1498         if (! result) /* broadcast announce */
1499                 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1500                                                    subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1501       __end:
1502         if (sport)
1503                 snd_seq_port_unlock(sport);
1504         if (dport)
1505                 snd_seq_port_unlock(dport);
1506         if (sender)
1507                 snd_seq_client_unlock(sender);
1508         if (receiver)
1509                 snd_seq_client_unlock(receiver);
1510         return result;
1511 }
1512 
1513 
1514 /* CREATE_QUEUE ioctl() */
1515 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client, void *arg)
1516 {
1517         struct snd_seq_queue_info *info = arg;
1518         struct snd_seq_queue *q;
1519 
1520         q = snd_seq_queue_alloc(client->number, info->locked, info->flags);
1521         if (IS_ERR(q))
1522                 return PTR_ERR(q);
1523 
1524         info->queue = q->queue;
1525         info->locked = q->locked;
1526         info->owner = q->owner;
1527 
1528         /* set queue name */
1529         if (!info->name[0])
1530                 snprintf(info->name, sizeof(info->name), "Queue-%d", q->queue);
1531         strlcpy(q->name, info->name, sizeof(q->name));
1532         snd_use_lock_free(&q->use_lock);
1533 
1534         return 0;
1535 }
1536 
1537 /* DELETE_QUEUE ioctl() */
1538 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client, void *arg)
1539 {
1540         struct snd_seq_queue_info *info = arg;
1541 
1542         return snd_seq_queue_delete(client->number, info->queue);
1543 }
1544 
1545 /* GET_QUEUE_INFO ioctl() */
1546 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client,
1547                                         void *arg)
1548 {
1549         struct snd_seq_queue_info *info = arg;
1550         struct snd_seq_queue *q;
1551 
1552         q = queueptr(info->queue);
1553         if (q == NULL)
1554                 return -EINVAL;
1555 
1556         memset(info, 0, sizeof(*info));
1557         info->queue = q->queue;
1558         info->owner = q->owner;
1559         info->locked = q->locked;
1560         strlcpy(info->name, q->name, sizeof(info->name));
1561         queuefree(q);
1562 
1563         return 0;
1564 }
1565 
1566 /* SET_QUEUE_INFO ioctl() */
1567 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
1568                                         void *arg)
1569 {
1570         struct snd_seq_queue_info *info = arg;
1571         struct snd_seq_queue *q;
1572 
1573         if (info->owner != client->number)
1574                 return -EINVAL;
1575 
1576         /* change owner/locked permission */
1577         if (snd_seq_queue_check_access(info->queue, client->number)) {
1578                 if (snd_seq_queue_set_owner(info->queue, client->number, info->locked) < 0)
1579                         return -EPERM;
1580                 if (info->locked)
1581                         snd_seq_queue_use(info->queue, client->number, 1);
1582         } else {
1583                 return -EPERM;
1584         }       
1585 
1586         q = queueptr(info->queue);
1587         if (! q)
1588                 return -EINVAL;
1589         if (q->owner != client->number) {
1590                 queuefree(q);
1591                 return -EPERM;
1592         }
1593         strlcpy(q->name, info->name, sizeof(q->name));
1594         queuefree(q);
1595 
1596         return 0;
1597 }
1598 
1599 /* GET_NAMED_QUEUE ioctl() */
1600 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client,
1601                                          void *arg)
1602 {
1603         struct snd_seq_queue_info *info = arg;
1604         struct snd_seq_queue *q;
1605 
1606         q = snd_seq_queue_find_name(info->name);
1607         if (q == NULL)
1608                 return -EINVAL;
1609         info->queue = q->queue;
1610         info->owner = q->owner;
1611         info->locked = q->locked;
1612         queuefree(q);
1613 
1614         return 0;
1615 }
1616 
1617 /* GET_QUEUE_STATUS ioctl() */
1618 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
1619                                           void *arg)
1620 {
1621         struct snd_seq_queue_status *status = arg;
1622         struct snd_seq_queue *queue;
1623         struct snd_seq_timer *tmr;
1624 
1625         queue = queueptr(status->queue);
1626         if (queue == NULL)
1627                 return -EINVAL;
1628         memset(status, 0, sizeof(*status));
1629         status->queue = queue->queue;
1630         
1631         tmr = queue->timer;
1632         status->events = queue->tickq->cells + queue->timeq->cells;
1633 
1634         status->time = snd_seq_timer_get_cur_time(tmr);
1635         status->tick = snd_seq_timer_get_cur_tick(tmr);
1636 
1637         status->running = tmr->running;
1638 
1639         status->flags = queue->flags;
1640         queuefree(queue);
1641 
1642         return 0;
1643 }
1644 
1645 
1646 /* GET_QUEUE_TEMPO ioctl() */
1647 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
1648                                          void *arg)
1649 {
1650         struct snd_seq_queue_tempo *tempo = arg;
1651         struct snd_seq_queue *queue;
1652         struct snd_seq_timer *tmr;
1653 
1654         queue = queueptr(tempo->queue);
1655         if (queue == NULL)
1656                 return -EINVAL;
1657         memset(tempo, 0, sizeof(*tempo));
1658         tempo->queue = queue->queue;
1659         
1660         tmr = queue->timer;
1661 
1662         tempo->tempo = tmr->tempo;
1663         tempo->ppq = tmr->ppq;
1664         tempo->skew_value = tmr->skew;
1665         tempo->skew_base = tmr->skew_base;
1666         queuefree(queue);
1667 
1668         return 0;
1669 }
1670 
1671 
1672 /* SET_QUEUE_TEMPO ioctl() */
1673 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1674 {
1675         if (!snd_seq_queue_check_access(tempo->queue, client))
1676                 return -EPERM;
1677         return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1678 }
1679 EXPORT_SYMBOL(snd_seq_set_queue_tempo);
1680 
1681 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
1682                                          void *arg)
1683 {
1684         struct snd_seq_queue_tempo *tempo = arg;
1685         int result;
1686 
1687         result = snd_seq_set_queue_tempo(client->number, tempo);
1688         return result < 0 ? result : 0;
1689 }
1690 
1691 
1692 /* GET_QUEUE_TIMER ioctl() */
1693 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
1694                                          void *arg)
1695 {
1696         struct snd_seq_queue_timer *timer = arg;
1697         struct snd_seq_queue *queue;
1698         struct snd_seq_timer *tmr;
1699 
1700         queue = queueptr(timer->queue);
1701         if (queue == NULL)
1702                 return -EINVAL;
1703 
1704         if (mutex_lock_interruptible(&queue->timer_mutex)) {
1705                 queuefree(queue);
1706                 return -ERESTARTSYS;
1707         }
1708         tmr = queue->timer;
1709         memset(timer, 0, sizeof(*timer));
1710         timer->queue = queue->queue;
1711 
1712         timer->type = tmr->type;
1713         if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1714                 timer->u.alsa.id = tmr->alsa_id;
1715                 timer->u.alsa.resolution = tmr->preferred_resolution;
1716         }
1717         mutex_unlock(&queue->timer_mutex);
1718         queuefree(queue);
1719         
1720         return 0;
1721 }
1722 
1723 
1724 /* SET_QUEUE_TIMER ioctl() */
1725 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
1726                                          void *arg)
1727 {
1728         struct snd_seq_queue_timer *timer = arg;
1729         int result = 0;
1730 
1731         if (timer->type != SNDRV_SEQ_TIMER_ALSA)
1732                 return -EINVAL;
1733 
1734         if (snd_seq_queue_check_access(timer->queue, client->number)) {
1735                 struct snd_seq_queue *q;
1736                 struct snd_seq_timer *tmr;
1737 
1738                 q = queueptr(timer->queue);
1739                 if (q == NULL)
1740                         return -ENXIO;
1741                 if (mutex_lock_interruptible(&q->timer_mutex)) {
1742                         queuefree(q);
1743                         return -ERESTARTSYS;
1744                 }
1745                 tmr = q->timer;
1746                 snd_seq_queue_timer_close(timer->queue);
1747                 tmr->type = timer->type;
1748                 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1749                         tmr->alsa_id = timer->u.alsa.id;
1750                         tmr->preferred_resolution = timer->u.alsa.resolution;
1751                 }
1752                 result = snd_seq_queue_timer_open(timer->queue);
1753                 mutex_unlock(&q->timer_mutex);
1754                 queuefree(q);
1755         } else {
1756                 return -EPERM;
1757         }       
1758 
1759         return result;
1760 }
1761 
1762 
1763 /* GET_QUEUE_CLIENT ioctl() */
1764 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
1765                                           void *arg)
1766 {
1767         struct snd_seq_queue_client *info = arg;
1768         int used;
1769 
1770         used = snd_seq_queue_is_used(info->queue, client->number);
1771         if (used < 0)
1772                 return -EINVAL;
1773         info->used = used;
1774         info->client = client->number;
1775 
1776         return 0;
1777 }
1778 
1779 
1780 /* SET_QUEUE_CLIENT ioctl() */
1781 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
1782                                           void *arg)
1783 {
1784         struct snd_seq_queue_client *info = arg;
1785         int err;
1786 
1787         if (info->used >= 0) {
1788                 err = snd_seq_queue_use(info->queue, client->number, info->used);
1789                 if (err < 0)
1790                         return err;
1791         }
1792 
1793         return snd_seq_ioctl_get_queue_client(client, arg);
1794 }
1795 
1796 
1797 /* GET_CLIENT_POOL ioctl() */
1798 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
1799                                          void *arg)
1800 {
1801         struct snd_seq_client_pool *info = arg;
1802         struct snd_seq_client *cptr;
1803 
1804         cptr = snd_seq_client_use_ptr(info->client);
1805         if (cptr == NULL)
1806                 return -ENOENT;
1807         memset(info, 0, sizeof(*info));
1808         info->client = cptr->number;
1809         info->output_pool = cptr->pool->size;
1810         info->output_room = cptr->pool->room;
1811         info->output_free = info->output_pool;
1812         info->output_free = snd_seq_unused_cells(cptr->pool);
1813         if (cptr->type == USER_CLIENT) {
1814                 info->input_pool = cptr->data.user.fifo_pool_size;
1815                 info->input_free = info->input_pool;
1816                 if (cptr->data.user.fifo)
1817                         info->input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool);
1818         } else {
1819                 info->input_pool = 0;
1820                 info->input_free = 0;
1821         }
1822         snd_seq_client_unlock(cptr);
1823         
1824         return 0;
1825 }
1826 
1827 /* SET_CLIENT_POOL ioctl() */
1828 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
1829                                          void *arg)
1830 {
1831         struct snd_seq_client_pool *info = arg;
1832         int rc;
1833 
1834         if (client->number != info->client)
1835                 return -EINVAL; /* can't change other clients */
1836 
1837         if (info->output_pool >= 1 && info->output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1838             (! snd_seq_write_pool_allocated(client) ||
1839              info->output_pool != client->pool->size)) {
1840                 if (snd_seq_write_pool_allocated(client)) {
1841                         /* remove all existing cells */
1842                         snd_seq_pool_mark_closing(client->pool);
1843                         snd_seq_queue_client_leave_cells(client->number);
1844                         snd_seq_pool_done(client->pool);
1845                 }
1846                 client->pool->size = info->output_pool;
1847                 rc = snd_seq_pool_init(client->pool);
1848                 if (rc < 0)
1849                         return rc;
1850         }
1851         if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
1852             info->input_pool >= 1 &&
1853             info->input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1854             info->input_pool != client->data.user.fifo_pool_size) {
1855                 /* change pool size */
1856                 rc = snd_seq_fifo_resize(client->data.user.fifo, info->input_pool);
1857                 if (rc < 0)
1858                         return rc;
1859                 client->data.user.fifo_pool_size = info->input_pool;
1860         }
1861         if (info->output_room >= 1 &&
1862             info->output_room <= client->pool->size) {
1863                 client->pool->room  = info->output_room;
1864         }
1865 
1866         return snd_seq_ioctl_get_client_pool(client, arg);
1867 }
1868 
1869 
1870 /* REMOVE_EVENTS ioctl() */
1871 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
1872                                        void *arg)
1873 {
1874         struct snd_seq_remove_events *info = arg;
1875 
1876         /*
1877          * Input mostly not implemented XXX.
1878          */
1879         if (info->remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1880                 /*
1881                  * No restrictions so for a user client we can clear
1882                  * the whole fifo
1883                  */
1884                 if (client->type == USER_CLIENT && client->data.user.fifo)
1885                         snd_seq_fifo_clear(client->data.user.fifo);
1886         }
1887 
1888         if (info->remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1889                 snd_seq_queue_remove_cells(client->number, info);
1890 
1891         return 0;
1892 }
1893 
1894 
1895 /*
1896  * get subscription info
1897  */
1898 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
1899                                           void *arg)
1900 {
1901         struct snd_seq_port_subscribe *subs = arg;
1902         int result;
1903         struct snd_seq_client *sender = NULL;
1904         struct snd_seq_client_port *sport = NULL;
1905         struct snd_seq_subscribers *p;
1906 
1907         result = -EINVAL;
1908         if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1909                 goto __end;
1910         if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1911                 goto __end;
1912         p = snd_seq_port_get_subscription(&sport->c_src, &subs->dest);
1913         if (p) {
1914                 result = 0;
1915                 *subs = p->info;
1916         } else
1917                 result = -ENOENT;
1918 
1919       __end:
1920         if (sport)
1921                 snd_seq_port_unlock(sport);
1922         if (sender)
1923                 snd_seq_client_unlock(sender);
1924 
1925         return result;
1926 }
1927 
1928 
1929 /*
1930  * get subscription info - check only its presence
1931  */
1932 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client, void *arg)
1933 {
1934         struct snd_seq_query_subs *subs = arg;
1935         int result = -ENXIO;
1936         struct snd_seq_client *cptr = NULL;
1937         struct snd_seq_client_port *port = NULL;
1938         struct snd_seq_port_subs_info *group;
1939         struct list_head *p;
1940         int i;
1941 
1942         if ((cptr = snd_seq_client_use_ptr(subs->root.client)) == NULL)
1943                 goto __end;
1944         if ((port = snd_seq_port_use_ptr(cptr, subs->root.port)) == NULL)
1945                 goto __end;
1946 
1947         switch (subs->type) {
1948         case SNDRV_SEQ_QUERY_SUBS_READ:
1949                 group = &port->c_src;
1950                 break;
1951         case SNDRV_SEQ_QUERY_SUBS_WRITE:
1952                 group = &port->c_dest;
1953                 break;
1954         default:
1955                 goto __end;
1956         }
1957 
1958         down_read(&group->list_mutex);
1959         /* search for the subscriber */
1960         subs->num_subs = group->count;
1961         i = 0;
1962         result = -ENOENT;
1963         list_for_each(p, &group->list_head) {
1964                 if (i++ == subs->index) {
1965                         /* found! */
1966                         struct snd_seq_subscribers *s;
1967                         if (subs->type == SNDRV_SEQ_QUERY_SUBS_READ) {
1968                                 s = list_entry(p, struct snd_seq_subscribers, src_list);
1969                                 subs->addr = s->info.dest;
1970                         } else {
1971                                 s = list_entry(p, struct snd_seq_subscribers, dest_list);
1972                                 subs->addr = s->info.sender;
1973                         }
1974                         subs->flags = s->info.flags;
1975                         subs->queue = s->info.queue;
1976                         result = 0;
1977                         break;
1978                 }
1979         }
1980         up_read(&group->list_mutex);
1981 
1982       __end:
1983         if (port)
1984                 snd_seq_port_unlock(port);
1985         if (cptr)
1986                 snd_seq_client_unlock(cptr);
1987 
1988         return result;
1989 }
1990 
1991 
1992 /*
1993  * query next client
1994  */
1995 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
1996                                            void *arg)
1997 {
1998         struct snd_seq_client_info *info = arg;
1999         struct snd_seq_client *cptr = NULL;
2000 
2001         /* search for next client */
2002         info->client++;
2003         if (info->client < 0)
2004                 info->client = 0;
2005         for (; info->client < SNDRV_SEQ_MAX_CLIENTS; info->client++) {
2006                 cptr = snd_seq_client_use_ptr(info->client);
2007                 if (cptr)
2008                         break; /* found */
2009         }
2010         if (cptr == NULL)
2011                 return -ENOENT;
2012 
2013         get_client_info(cptr, info);
2014         snd_seq_client_unlock(cptr);
2015 
2016         return 0;
2017 }
2018 
2019 /* 
2020  * query next port
2021  */
2022 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
2023                                          void *arg)
2024 {
2025         struct snd_seq_port_info *info = arg;
2026         struct snd_seq_client *cptr;
2027         struct snd_seq_client_port *port = NULL;
2028 
2029         cptr = snd_seq_client_use_ptr(info->addr.client);
2030         if (cptr == NULL)
2031                 return -ENXIO;
2032 
2033         /* search for next port */
2034         info->addr.port++;
2035         port = snd_seq_port_query_nearest(cptr, info);
2036         if (port == NULL) {
2037                 snd_seq_client_unlock(cptr);
2038                 return -ENOENT;
2039         }
2040 
2041         /* get port info */
2042         info->addr = port->addr;
2043         snd_seq_get_port_info(port, info);
2044         snd_seq_port_unlock(port);
2045         snd_seq_client_unlock(cptr);
2046 
2047         return 0;
2048 }
2049 
2050 /* -------------------------------------------------------- */
2051 
2052 static const struct ioctl_handler {
2053         unsigned int cmd;
2054         int (*func)(struct snd_seq_client *client, void *arg);
2055 } ioctl_handlers[] = {
2056         { SNDRV_SEQ_IOCTL_PVERSION, snd_seq_ioctl_pversion },
2057         { SNDRV_SEQ_IOCTL_CLIENT_ID, snd_seq_ioctl_client_id },
2058         { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2059         { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2060         { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2061         { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2062         { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2063         { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2064         { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2065         { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2066         { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2067         { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2068         { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2069         { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2070         { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2071         { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2072         { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2073         { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2074         { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2075         { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2076         { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2077         { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2078         { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2079         { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2080         { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2081         { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2082         { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2083         { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2084         { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2085         { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2086         { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2087         { 0, NULL },
2088 };
2089 
2090 static long snd_seq_ioctl(struct file *file, unsigned int cmd,
2091                           unsigned long arg)
2092 {
2093         struct snd_seq_client *client = file->private_data;
2094         /* To use kernel stack for ioctl data. */
2095         union {
2096                 int pversion;
2097                 int client_id;
2098                 struct snd_seq_system_info      system_info;
2099                 struct snd_seq_running_info     running_info;
2100                 struct snd_seq_client_info      client_info;
2101                 struct snd_seq_port_info        port_info;
2102                 struct snd_seq_port_subscribe   port_subscribe;
2103                 struct snd_seq_queue_info       queue_info;
2104                 struct snd_seq_queue_status     queue_status;
2105                 struct snd_seq_queue_tempo      tempo;
2106                 struct snd_seq_queue_timer      queue_timer;
2107                 struct snd_seq_queue_client     queue_client;
2108                 struct snd_seq_client_pool      client_pool;
2109                 struct snd_seq_remove_events    remove_events;
2110                 struct snd_seq_query_subs       query_subs;
2111         } buf;
2112         const struct ioctl_handler *handler;
2113         unsigned long size;
2114         int err;
2115 
2116         if (snd_BUG_ON(!client))
2117                 return -ENXIO;
2118 
2119         for (handler = ioctl_handlers; handler->cmd > 0; ++handler) {
2120                 if (handler->cmd == cmd)
2121                         break;
2122         }
2123         if (handler->cmd == 0)
2124                 return -ENOTTY;
2125 
2126         memset(&buf, 0, sizeof(buf));
2127 
2128         /*
2129          * All of ioctl commands for ALSA sequencer get an argument of size
2130          * within 13 bits. We can safely pick up the size from the command.
2131          */
2132         size = _IOC_SIZE(handler->cmd);
2133         if (handler->cmd & IOC_IN) {
2134                 if (copy_from_user(&buf, (const void __user *)arg, size))
2135                         return -EFAULT;
2136         }
2137 
2138         mutex_lock(&client->ioctl_mutex);
2139         err = handler->func(client, &buf);
2140         mutex_unlock(&client->ioctl_mutex);
2141         if (err >= 0) {
2142                 /* Some commands includes a bug in 'dir' field. */
2143                 if (handler->cmd == SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT ||
2144                     handler->cmd == SNDRV_SEQ_IOCTL_SET_CLIENT_POOL ||
2145                     (handler->cmd & IOC_OUT))
2146                         if (copy_to_user((void __user *)arg, &buf, size))
2147                                 return -EFAULT;
2148         }
2149 
2150         return err;
2151 }
2152 
2153 #ifdef CONFIG_COMPAT
2154 #include "seq_compat.c"
2155 #else
2156 #define snd_seq_ioctl_compat    NULL
2157 #endif
2158 
2159 /* -------------------------------------------------------- */
2160 
2161 
2162 /* exported to kernel modules */
2163 int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
2164                                  const char *name_fmt, ...)
2165 {
2166         struct snd_seq_client *client;
2167         va_list args;
2168 
2169         if (snd_BUG_ON(in_interrupt()))
2170                 return -EBUSY;
2171 
2172         if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD)
2173                 return -EINVAL;
2174         if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
2175                 return -EINVAL;
2176 
2177         if (mutex_lock_interruptible(&register_mutex))
2178                 return -ERESTARTSYS;
2179 
2180         if (card) {
2181                 client_index += SNDRV_SEQ_GLOBAL_CLIENTS
2182                         + card->number * SNDRV_SEQ_CLIENTS_PER_CARD;
2183                 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN)
2184                         client_index = -1;
2185         }
2186 
2187         /* empty write queue as default */
2188         client = seq_create_client1(client_index, 0);
2189         if (client == NULL) {
2190                 mutex_unlock(&register_mutex);
2191                 return -EBUSY;  /* failure code */
2192         }
2193         usage_alloc(&client_usage, 1);
2194 
2195         client->accept_input = 1;
2196         client->accept_output = 1;
2197         client->data.kernel.card = card;
2198                 
2199         va_start(args, name_fmt);
2200         vsnprintf(client->name, sizeof(client->name), name_fmt, args);
2201         va_end(args);
2202 
2203         client->type = KERNEL_CLIENT;
2204         mutex_unlock(&register_mutex);
2205 
2206         /* make others aware this new client */
2207         snd_seq_system_client_ev_client_start(client->number);
2208         
2209         /* return client number to caller */
2210         return client->number;
2211 }
2212 EXPORT_SYMBOL(snd_seq_create_kernel_client);
2213 
2214 /* exported to kernel modules */
2215 int snd_seq_delete_kernel_client(int client)
2216 {
2217         struct snd_seq_client *ptr;
2218 
2219         if (snd_BUG_ON(in_interrupt()))
2220                 return -EBUSY;
2221 
2222         ptr = clientptr(client);
2223         if (ptr == NULL)
2224                 return -EINVAL;
2225 
2226         seq_free_client(ptr);
2227         kfree(ptr);
2228         return 0;
2229 }
2230 EXPORT_SYMBOL(snd_seq_delete_kernel_client);
2231 
2232 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue
2233  * and snd_seq_kernel_client_enqueue_blocking
2234  */
2235 static int kernel_client_enqueue(int client, struct snd_seq_event *ev,
2236                                  struct file *file, int blocking,
2237                                  int atomic, int hop)
2238 {
2239         struct snd_seq_client *cptr;
2240         int result;
2241 
2242         if (snd_BUG_ON(!ev))
2243                 return -EINVAL;
2244 
2245         if (ev->type == SNDRV_SEQ_EVENT_NONE)
2246                 return 0; /* ignore this */
2247         if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2248                 return -EINVAL; /* quoted events can't be enqueued */
2249 
2250         /* fill in client number */
2251         ev->source.client = client;
2252 
2253         if (check_event_type_and_length(ev))
2254                 return -EINVAL;
2255 
2256         cptr = snd_seq_client_use_ptr(client);
2257         if (cptr == NULL)
2258                 return -EINVAL;
2259         
2260         if (! cptr->accept_output)
2261                 result = -EPERM;
2262         else /* send it */
2263                 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, atomic, hop);
2264 
2265         snd_seq_client_unlock(cptr);
2266         return result;
2267 }
2268 
2269 /*
2270  * exported, called by kernel clients to enqueue events (w/o blocking)
2271  *
2272  * RETURN VALUE: zero if succeed, negative if error
2273  */
2274 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev,
2275                                   int atomic, int hop)
2276 {
2277         return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop);
2278 }
2279 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
2280 
2281 /*
2282  * exported, called by kernel clients to enqueue events (with blocking)
2283  *
2284  * RETURN VALUE: zero if succeed, negative if error
2285  */
2286 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev,
2287                                            struct file *file,
2288                                            int atomic, int hop)
2289 {
2290         return kernel_client_enqueue(client, ev, file, 1, atomic, hop);
2291 }
2292 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking);
2293 
2294 /* 
2295  * exported, called by kernel clients to dispatch events directly to other
2296  * clients, bypassing the queues.  Event time-stamp will be updated.
2297  *
2298  * RETURN VALUE: negative = delivery failed,
2299  *               zero, or positive: the number of delivered events
2300  */
2301 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev,
2302                                    int atomic, int hop)
2303 {
2304         struct snd_seq_client *cptr;
2305         int result;
2306 
2307         if (snd_BUG_ON(!ev))
2308                 return -EINVAL;
2309 
2310         /* fill in client number */
2311         ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2312         ev->source.client = client;
2313 
2314         if (check_event_type_and_length(ev))
2315                 return -EINVAL;
2316 
2317         cptr = snd_seq_client_use_ptr(client);
2318         if (cptr == NULL)
2319                 return -EINVAL;
2320 
2321         if (!cptr->accept_output)
2322                 result = -EPERM;
2323         else
2324                 result = snd_seq_deliver_event(cptr, ev, atomic, hop);
2325 
2326         snd_seq_client_unlock(cptr);
2327         return result;
2328 }
2329 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch);
2330 
2331 /**
2332  * snd_seq_kernel_client_ctl - operate a command for a client with data in
2333  *                             kernel space.
2334  * @clientid:   A numerical ID for a client.
2335  * @cmd:        An ioctl(2) command for ALSA sequencer operation.
2336  * @arg:        A pointer to data in kernel space.
2337  *
2338  * Against its name, both kernel/application client can be handled by this
2339  * kernel API. A pointer of 'arg' argument should be in kernel space.
2340  *
2341  * Return: 0 at success. Negative error code at failure.
2342  */
2343 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2344 {
2345         const struct ioctl_handler *handler;
2346         struct snd_seq_client *client;
2347 
2348         client = clientptr(clientid);
2349         if (client == NULL)
2350                 return -ENXIO;
2351 
2352         for (handler = ioctl_handlers; handler->cmd > 0; ++handler) {
2353                 if (handler->cmd == cmd)
2354                         return handler->func(client, arg);
2355         }
2356 
2357         pr_debug("ALSA: seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n",
2358                  cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2359         return -ENOTTY;
2360 }
2361 EXPORT_SYMBOL(snd_seq_kernel_client_ctl);
2362 
2363 /* exported (for OSS emulator) */
2364 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2365 {
2366         struct snd_seq_client *client;
2367 
2368         client = clientptr(clientid);
2369         if (client == NULL)
2370                 return -ENXIO;
2371 
2372         if (! snd_seq_write_pool_allocated(client))
2373                 return 1;
2374         if (snd_seq_pool_poll_wait(client->pool, file, wait))
2375                 return 1;
2376         return 0;
2377 }
2378 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll);
2379 
2380 /*---------------------------------------------------------------------------*/
2381 
2382 #ifdef CONFIG_SND_PROC_FS
2383 /*
2384  *  /proc interface
2385  */
2386 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer,
2387                                           struct snd_seq_port_subs_info *group,
2388                                           int is_src, char *msg)
2389 {
2390         struct list_head *p;
2391         struct snd_seq_subscribers *s;
2392         int count = 0;
2393 
2394         down_read(&group->list_mutex);
2395         if (list_empty(&group->list_head)) {
2396                 up_read(&group->list_mutex);
2397                 return;
2398         }
2399         snd_iprintf(buffer, msg);
2400         list_for_each(p, &group->list_head) {
2401                 if (is_src)
2402                         s = list_entry(p, struct snd_seq_subscribers, src_list);
2403                 else
2404                         s = list_entry(p, struct snd_seq_subscribers, dest_list);
2405                 if (count++)
2406                         snd_iprintf(buffer, ", ");
2407                 snd_iprintf(buffer, "%d:%d",
2408                             is_src ? s->info.dest.client : s->info.sender.client,
2409                             is_src ? s->info.dest.port : s->info.sender.port);
2410                 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
2411                         snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
2412                 if (group->exclusive)
2413                         snd_iprintf(buffer, "[ex]");
2414         }
2415         up_read(&group->list_mutex);
2416         snd_iprintf(buffer, "\n");
2417 }
2418 
2419 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
2420 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
2421 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
2422 
2423 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2424 
2425 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
2426                                     struct snd_seq_client *client)
2427 {
2428         struct snd_seq_client_port *p;
2429 
2430         mutex_lock(&client->ports_mutex);
2431         list_for_each_entry(p, &client->ports_list_head, list) {
2432                 snd_iprintf(buffer, "  Port %3d : \"%s\" (%c%c%c%c)\n",
2433                             p->addr.port, p->name,
2434                             FLAG_PERM_RD(p->capability),
2435                             FLAG_PERM_WR(p->capability),
2436                             FLAG_PERM_EX(p->capability),
2437                             FLAG_PERM_DUPLEX(p->capability));
2438                 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, "    Connecting To: ");
2439                 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, "    Connected From: ");
2440         }
2441         mutex_unlock(&client->ports_mutex);
2442 }
2443 
2444 
2445 /* exported to seq_info.c */
2446 void snd_seq_info_clients_read(struct snd_info_entry *entry, 
2447                                struct snd_info_buffer *buffer)
2448 {
2449         int c;
2450         struct snd_seq_client *client;
2451 
2452         snd_iprintf(buffer, "Client info\n");
2453         snd_iprintf(buffer, "  cur  clients : %d\n", client_usage.cur);
2454         snd_iprintf(buffer, "  peak clients : %d\n", client_usage.peak);
2455         snd_iprintf(buffer, "  max  clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
2456         snd_iprintf(buffer, "\n");
2457 
2458         /* list the client table */
2459         for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2460                 client = snd_seq_client_use_ptr(c);
2461                 if (client == NULL)
2462                         continue;
2463                 if (client->type == NO_CLIENT) {
2464                         snd_seq_client_unlock(client);
2465                         continue;
2466                 }
2467 
2468                 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n",
2469                             c, client->name,
2470                             client->type == USER_CLIENT ? "User" : "Kernel");
2471                 snd_seq_info_dump_ports(buffer, client);
2472                 if (snd_seq_write_pool_allocated(client)) {
2473                         snd_iprintf(buffer, "  Output pool :\n");
2474                         snd_seq_info_pool(buffer, client->pool, "    ");
2475                 }
2476                 if (client->type == USER_CLIENT && client->data.user.fifo &&
2477                     client->data.user.fifo->pool) {
2478                         snd_iprintf(buffer, "  Input pool :\n");
2479                         snd_seq_info_pool(buffer, client->data.user.fifo->pool, "    ");
2480                 }
2481                 snd_seq_client_unlock(client);
2482         }
2483 }
2484 #endif /* CONFIG_SND_PROC_FS */
2485 
2486 /*---------------------------------------------------------------------------*/
2487 
2488 
2489 /*
2490  *  REGISTRATION PART
2491  */
2492 
2493 static const struct file_operations snd_seq_f_ops =
2494 {
2495         .owner =        THIS_MODULE,
2496         .read =         snd_seq_read,
2497         .write =        snd_seq_write,
2498         .open =         snd_seq_open,
2499         .release =      snd_seq_release,
2500         .llseek =       no_llseek,
2501         .poll =         snd_seq_poll,
2502         .unlocked_ioctl =       snd_seq_ioctl,
2503         .compat_ioctl = snd_seq_ioctl_compat,
2504 };
2505 
2506 static struct device seq_dev;
2507 
2508 /* 
2509  * register sequencer device 
2510  */
2511 int __init snd_sequencer_device_init(void)
2512 {
2513         int err;
2514 
2515         snd_device_initialize(&seq_dev, NULL);
2516         dev_set_name(&seq_dev, "seq");
2517 
2518         if (mutex_lock_interruptible(&register_mutex))
2519                 return -ERESTARTSYS;
2520 
2521         err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
2522                                   &snd_seq_f_ops, NULL, &seq_dev);
2523         if (err < 0) {
2524                 mutex_unlock(&register_mutex);
2525                 put_device(&seq_dev);
2526                 return err;
2527         }
2528         
2529         mutex_unlock(&register_mutex);
2530 
2531         return 0;
2532 }
2533 
2534 
2535 
2536 /* 
2537  * unregister sequencer device 
2538  */
2539 void __exit snd_sequencer_device_done(void)
2540 {
2541         snd_unregister_device(&seq_dev);
2542         put_device(&seq_dev);
2543 }
2544 

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