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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         spin_lock_irqsave(&clients_lock, flags);
259         clienttablock[client->number] = 1;
260         clienttab[client->number] = NULL;
261         spin_unlock_irqrestore(&clients_lock, flags);
262         snd_seq_delete_all_ports(client);
263         snd_seq_queue_client_leave(client->number);
264         snd_use_lock_sync(&client->use_lock);
265         snd_seq_queue_client_termination(client->number);
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                                         struct mutex *mutexp)
915 {
916         struct snd_seq_event_cell *cell;
917         int err;
918 
919         /* special queue values - force direct passing */
920         if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
921                 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
922                 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
923         } else
924 #ifdef SUPPORT_BROADCAST
925                 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) {
926                         event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST;
927                         event->queue = SNDRV_SEQ_QUEUE_DIRECT;
928                 }
929 #endif
930         if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
931                 /* check presence of source port */
932                 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port);
933                 if (src_port == NULL)
934                         return -EINVAL;
935                 snd_seq_port_unlock(src_port);
936         }
937 
938         /* direct event processing without enqueued */
939         if (snd_seq_ev_is_direct(event)) {
940                 if (event->type == SNDRV_SEQ_EVENT_NOTE)
941                         return -EINVAL; /* this event must be enqueued! */
942                 return snd_seq_deliver_event(client, event, atomic, hop);
943         }
944 
945         /* Not direct, normal queuing */
946         if (snd_seq_queue_is_used(event->queue, client->number) <= 0)
947                 return -EINVAL;  /* invalid queue */
948         if (! snd_seq_write_pool_allocated(client))
949                 return -ENXIO; /* queue is not allocated */
950 
951         /* allocate an event cell */
952         err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic,
953                                 file, mutexp);
954         if (err < 0)
955                 return err;
956 
957         /* we got a cell. enqueue it. */
958         if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
959                 snd_seq_cell_free(cell);
960                 return err;
961         }
962 
963         return 0;
964 }
965 
966 
967 /*
968  * check validity of event type and data length.
969  * return non-zero if invalid.
970  */
971 static int check_event_type_and_length(struct snd_seq_event *ev)
972 {
973         switch (snd_seq_ev_length_type(ev)) {
974         case SNDRV_SEQ_EVENT_LENGTH_FIXED:
975                 if (snd_seq_ev_is_variable_type(ev))
976                         return -EINVAL;
977                 break;
978         case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
979                 if (! snd_seq_ev_is_variable_type(ev) ||
980                     (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
981                         return -EINVAL;
982                 break;
983         case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
984                 if (! snd_seq_ev_is_direct(ev))
985                         return -EINVAL;
986                 break;
987         }
988         return 0;
989 }
990 
991 
992 /* handle write() */
993 /* possible error values:
994  *      -ENXIO  invalid client or file open mode
995  *      -ENOMEM malloc failed
996  *      -EFAULT seg. fault during copy from user space
997  *      -EINVAL invalid event
998  *      -EAGAIN no space in output pool
999  *      -EINTR  interrupts while sleep
1000  *      -EMLINK too many hops
1001  *      others  depends on return value from driver callback
1002  */
1003 static ssize_t snd_seq_write(struct file *file, const char __user *buf,
1004                              size_t count, loff_t *offset)
1005 {
1006         struct snd_seq_client *client = file->private_data;
1007         int written = 0, len;
1008         int err;
1009         struct snd_seq_event event;
1010 
1011         if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
1012                 return -ENXIO;
1013 
1014         /* check client structures are in place */
1015         if (snd_BUG_ON(!client))
1016                 return -ENXIO;
1017                 
1018         if (!client->accept_output || client->pool == NULL)
1019                 return -ENXIO;
1020 
1021         /* allocate the pool now if the pool is not allocated yet */ 
1022         mutex_lock(&client->ioctl_mutex);
1023         if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
1024                 err = snd_seq_pool_init(client->pool);
1025                 if (err < 0)
1026                         goto out;
1027         }
1028 
1029         /* only process whole events */
1030         err = -EINVAL;
1031         while (count >= sizeof(struct snd_seq_event)) {
1032                 /* Read in the event header from the user */
1033                 len = sizeof(event);
1034                 if (copy_from_user(&event, buf, len)) {
1035                         err = -EFAULT;
1036                         break;
1037                 }
1038                 event.source.client = client->number;   /* fill in client number */
1039                 /* Check for extension data length */
1040                 if (check_event_type_and_length(&event)) {
1041                         err = -EINVAL;
1042                         break;
1043                 }
1044 
1045                 /* check for special events */
1046                 if (event.type == SNDRV_SEQ_EVENT_NONE)
1047                         goto __skip_event;
1048                 else if (snd_seq_ev_is_reserved(&event)) {
1049                         err = -EINVAL;
1050                         break;
1051                 }
1052 
1053                 if (snd_seq_ev_is_variable(&event)) {
1054                         int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK;
1055                         if ((size_t)(extlen + len) > count) {
1056                                 /* back out, will get an error this time or next */
1057                                 err = -EINVAL;
1058                                 break;
1059                         }
1060                         /* set user space pointer */
1061                         event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
1062                         event.data.ext.ptr = (char __force *)buf
1063                                                 + sizeof(struct snd_seq_event);
1064                         len += extlen; /* increment data length */
1065                 } else {
1066 #ifdef CONFIG_COMPAT
1067                         if (client->convert32 && snd_seq_ev_is_varusr(&event)) {
1068                                 void *ptr = (void __force *)compat_ptr(event.data.raw32.d[1]);
1069                                 event.data.ext.ptr = ptr;
1070                         }
1071 #endif
1072                 }
1073 
1074                 /* ok, enqueue it */
1075                 err = snd_seq_client_enqueue_event(client, &event, file,
1076                                                    !(file->f_flags & O_NONBLOCK),
1077                                                    0, 0, &client->ioctl_mutex);
1078                 if (err < 0)
1079                         break;
1080 
1081         __skip_event:
1082                 /* Update pointers and counts */
1083                 count -= len;
1084                 buf += len;
1085                 written += len;
1086         }
1087 
1088  out:
1089         mutex_unlock(&client->ioctl_mutex);
1090         return written ? written : err;
1091 }
1092 
1093 
1094 /*
1095  * handle polling
1096  */
1097 static __poll_t snd_seq_poll(struct file *file, poll_table * wait)
1098 {
1099         struct snd_seq_client *client = file->private_data;
1100         __poll_t mask = 0;
1101 
1102         /* check client structures are in place */
1103         if (snd_BUG_ON(!client))
1104                 return -ENXIO;
1105 
1106         if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1107             client->data.user.fifo) {
1108 
1109                 /* check if data is available in the outqueue */
1110                 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
1111                         mask |= EPOLLIN | EPOLLRDNORM;
1112         }
1113 
1114         if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1115 
1116                 /* check if data is available in the pool */
1117                 if (!snd_seq_write_pool_allocated(client) ||
1118                     snd_seq_pool_poll_wait(client->pool, file, wait))
1119                         mask |= EPOLLOUT | EPOLLWRNORM;
1120         }
1121 
1122         return mask;
1123 }
1124 
1125 
1126 /*-----------------------------------------------------*/
1127 
1128 static int snd_seq_ioctl_pversion(struct snd_seq_client *client, void *arg)
1129 {
1130         int *pversion = arg;
1131 
1132         *pversion = SNDRV_SEQ_VERSION;
1133         return 0;
1134 }
1135 
1136 static int snd_seq_ioctl_client_id(struct snd_seq_client *client, void *arg)
1137 {
1138         int *client_id = arg;
1139 
1140         *client_id = client->number;
1141         return 0;
1142 }
1143 
1144 /* SYSTEM_INFO ioctl() */
1145 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void *arg)
1146 {
1147         struct snd_seq_system_info *info = arg;
1148 
1149         memset(info, 0, sizeof(*info));
1150         /* fill the info fields */
1151         info->queues = SNDRV_SEQ_MAX_QUEUES;
1152         info->clients = SNDRV_SEQ_MAX_CLIENTS;
1153         info->ports = SNDRV_SEQ_MAX_PORTS;
1154         info->channels = 256;   /* fixed limit */
1155         info->cur_clients = client_usage.cur;
1156         info->cur_queues = snd_seq_queue_get_cur_queues();
1157 
1158         return 0;
1159 }
1160 
1161 
1162 /* RUNNING_MODE ioctl() */
1163 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void  *arg)
1164 {
1165         struct snd_seq_running_info *info = arg;
1166         struct snd_seq_client *cptr;
1167         int err = 0;
1168 
1169         /* requested client number */
1170         cptr = snd_seq_client_use_ptr(info->client);
1171         if (cptr == NULL)
1172                 return -ENOENT;         /* don't change !!! */
1173 
1174 #ifdef SNDRV_BIG_ENDIAN
1175         if (!info->big_endian) {
1176                 err = -EINVAL;
1177                 goto __err;
1178         }
1179 #else
1180         if (info->big_endian) {
1181                 err = -EINVAL;
1182                 goto __err;
1183         }
1184 
1185 #endif
1186         if (info->cpu_mode > sizeof(long)) {
1187                 err = -EINVAL;
1188                 goto __err;
1189         }
1190         cptr->convert32 = (info->cpu_mode < sizeof(long));
1191  __err:
1192         snd_seq_client_unlock(cptr);
1193         return err;
1194 }
1195 
1196 /* CLIENT_INFO ioctl() */
1197 static void get_client_info(struct snd_seq_client *cptr,
1198                             struct snd_seq_client_info *info)
1199 {
1200         info->client = cptr->number;
1201 
1202         /* fill the info fields */
1203         info->type = cptr->type;
1204         strcpy(info->name, cptr->name);
1205         info->filter = cptr->filter;
1206         info->event_lost = cptr->event_lost;
1207         memcpy(info->event_filter, cptr->event_filter, 32);
1208         info->num_ports = cptr->num_ports;
1209 
1210         if (cptr->type == USER_CLIENT)
1211                 info->pid = pid_vnr(cptr->data.user.owner);
1212         else
1213                 info->pid = -1;
1214 
1215         if (cptr->type == KERNEL_CLIENT)
1216                 info->card = cptr->data.kernel.card ? cptr->data.kernel.card->number : -1;
1217         else
1218                 info->card = -1;
1219 
1220         memset(info->reserved, 0, sizeof(info->reserved));
1221 }
1222 
1223 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
1224                                          void *arg)
1225 {
1226         struct snd_seq_client_info *client_info = arg;
1227         struct snd_seq_client *cptr;
1228 
1229         /* requested client number */
1230         cptr = snd_seq_client_use_ptr(client_info->client);
1231         if (cptr == NULL)
1232                 return -ENOENT;         /* don't change !!! */
1233 
1234         get_client_info(cptr, client_info);
1235         snd_seq_client_unlock(cptr);
1236 
1237         return 0;
1238 }
1239 
1240 
1241 /* CLIENT_INFO ioctl() */
1242 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
1243                                          void *arg)
1244 {
1245         struct snd_seq_client_info *client_info = arg;
1246 
1247         /* it is not allowed to set the info fields for an another client */
1248         if (client->number != client_info->client)
1249                 return -EPERM;
1250         /* also client type must be set now */
1251         if (client->type != client_info->type)
1252                 return -EINVAL;
1253 
1254         /* fill the info fields */
1255         if (client_info->name[0])
1256                 strlcpy(client->name, client_info->name, sizeof(client->name));
1257 
1258         client->filter = client_info->filter;
1259         client->event_lost = client_info->event_lost;
1260         memcpy(client->event_filter, client_info->event_filter, 32);
1261 
1262         return 0;
1263 }
1264 
1265 
1266 /* 
1267  * CREATE PORT ioctl() 
1268  */
1269 static int snd_seq_ioctl_create_port(struct snd_seq_client *client, void *arg)
1270 {
1271         struct snd_seq_port_info *info = arg;
1272         struct snd_seq_client_port *port;
1273         struct snd_seq_port_callback *callback;
1274         int port_idx;
1275 
1276         /* it is not allowed to create the port for an another client */
1277         if (info->addr.client != client->number)
1278                 return -EPERM;
1279 
1280         port = snd_seq_create_port(client, (info->flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info->addr.port : -1);
1281         if (port == NULL)
1282                 return -ENOMEM;
1283 
1284         if (client->type == USER_CLIENT && info->kernel) {
1285                 port_idx = port->addr.port;
1286                 snd_seq_port_unlock(port);
1287                 snd_seq_delete_port(client, port_idx);
1288                 return -EINVAL;
1289         }
1290         if (client->type == KERNEL_CLIENT) {
1291                 if ((callback = info->kernel) != NULL) {
1292                         if (callback->owner)
1293                                 port->owner = callback->owner;
1294                         port->private_data = callback->private_data;
1295                         port->private_free = callback->private_free;
1296                         port->event_input = callback->event_input;
1297                         port->c_src.open = callback->subscribe;
1298                         port->c_src.close = callback->unsubscribe;
1299                         port->c_dest.open = callback->use;
1300                         port->c_dest.close = callback->unuse;
1301                 }
1302         }
1303 
1304         info->addr = port->addr;
1305 
1306         snd_seq_set_port_info(port, info);
1307         snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1308         snd_seq_port_unlock(port);
1309 
1310         return 0;
1311 }
1312 
1313 /* 
1314  * DELETE PORT ioctl() 
1315  */
1316 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client, void *arg)
1317 {
1318         struct snd_seq_port_info *info = arg;
1319         int err;
1320 
1321         /* it is not allowed to remove the port for an another client */
1322         if (info->addr.client != client->number)
1323                 return -EPERM;
1324 
1325         err = snd_seq_delete_port(client, info->addr.port);
1326         if (err >= 0)
1327                 snd_seq_system_client_ev_port_exit(client->number, info->addr.port);
1328         return err;
1329 }
1330 
1331 
1332 /* 
1333  * GET_PORT_INFO ioctl() (on any client) 
1334  */
1335 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client, void *arg)
1336 {
1337         struct snd_seq_port_info *info = arg;
1338         struct snd_seq_client *cptr;
1339         struct snd_seq_client_port *port;
1340 
1341         cptr = snd_seq_client_use_ptr(info->addr.client);
1342         if (cptr == NULL)
1343                 return -ENXIO;
1344 
1345         port = snd_seq_port_use_ptr(cptr, info->addr.port);
1346         if (port == NULL) {
1347                 snd_seq_client_unlock(cptr);
1348                 return -ENOENT;                 /* don't change */
1349         }
1350 
1351         /* get port info */
1352         snd_seq_get_port_info(port, info);
1353         snd_seq_port_unlock(port);
1354         snd_seq_client_unlock(cptr);
1355 
1356         return 0;
1357 }
1358 
1359 
1360 /* 
1361  * SET_PORT_INFO ioctl() (only ports on this/own client) 
1362  */
1363 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client, void *arg)
1364 {
1365         struct snd_seq_port_info *info = arg;
1366         struct snd_seq_client_port *port;
1367 
1368         if (info->addr.client != client->number) /* only set our own ports ! */
1369                 return -EPERM;
1370         port = snd_seq_port_use_ptr(client, info->addr.port);
1371         if (port) {
1372                 snd_seq_set_port_info(port, info);
1373                 snd_seq_port_unlock(port);
1374         }
1375         return 0;
1376 }
1377 
1378 
1379 /*
1380  * port subscription (connection)
1381  */
1382 #define PERM_RD         (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1383 #define PERM_WR         (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1384 
1385 static int check_subscription_permission(struct snd_seq_client *client,
1386                                          struct snd_seq_client_port *sport,
1387                                          struct snd_seq_client_port *dport,
1388                                          struct snd_seq_port_subscribe *subs)
1389 {
1390         if (client->number != subs->sender.client &&
1391             client->number != subs->dest.client) {
1392                 /* connection by third client - check export permission */
1393                 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1394                         return -EPERM;
1395                 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1396                         return -EPERM;
1397         }
1398 
1399         /* check read permission */
1400         /* if sender or receiver is the subscribing client itself,
1401          * no permission check is necessary
1402          */
1403         if (client->number != subs->sender.client) {
1404                 if (! check_port_perm(sport, PERM_RD))
1405                         return -EPERM;
1406         }
1407         /* check write permission */
1408         if (client->number != subs->dest.client) {
1409                 if (! check_port_perm(dport, PERM_WR))
1410                         return -EPERM;
1411         }
1412         return 0;
1413 }
1414 
1415 /*
1416  * send an subscription notify event to user client:
1417  * client must be user client.
1418  */
1419 int snd_seq_client_notify_subscription(int client, int port,
1420                                        struct snd_seq_port_subscribe *info,
1421                                        int evtype)
1422 {
1423         struct snd_seq_event event;
1424 
1425         memset(&event, 0, sizeof(event));
1426         event.type = evtype;
1427         event.data.connect.dest = info->dest;
1428         event.data.connect.sender = info->sender;
1429 
1430         return snd_seq_system_notify(client, port, &event);  /* non-atomic */
1431 }
1432 
1433 
1434 /* 
1435  * add to port's subscription list IOCTL interface 
1436  */
1437 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
1438                                         void *arg)
1439 {
1440         struct snd_seq_port_subscribe *subs = arg;
1441         int result = -EINVAL;
1442         struct snd_seq_client *receiver = NULL, *sender = NULL;
1443         struct snd_seq_client_port *sport = NULL, *dport = NULL;
1444 
1445         if ((receiver = snd_seq_client_use_ptr(subs->dest.client)) == NULL)
1446                 goto __end;
1447         if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1448                 goto __end;
1449         if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1450                 goto __end;
1451         if ((dport = snd_seq_port_use_ptr(receiver, subs->dest.port)) == NULL)
1452                 goto __end;
1453 
1454         result = check_subscription_permission(client, sport, dport, subs);
1455         if (result < 0)
1456                 goto __end;
1457 
1458         /* connect them */
1459         result = snd_seq_port_connect(client, sender, sport, receiver, dport, subs);
1460         if (! result) /* broadcast announce */
1461                 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1462                                                    subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1463       __end:
1464         if (sport)
1465                 snd_seq_port_unlock(sport);
1466         if (dport)
1467                 snd_seq_port_unlock(dport);
1468         if (sender)
1469                 snd_seq_client_unlock(sender);
1470         if (receiver)
1471                 snd_seq_client_unlock(receiver);
1472         return result;
1473 }
1474 
1475 
1476 /* 
1477  * remove from port's subscription list 
1478  */
1479 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
1480                                           void *arg)
1481 {
1482         struct snd_seq_port_subscribe *subs = arg;
1483         int result = -ENXIO;
1484         struct snd_seq_client *receiver = NULL, *sender = NULL;
1485         struct snd_seq_client_port *sport = NULL, *dport = NULL;
1486 
1487         if ((receiver = snd_seq_client_use_ptr(subs->dest.client)) == NULL)
1488                 goto __end;
1489         if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1490                 goto __end;
1491         if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1492                 goto __end;
1493         if ((dport = snd_seq_port_use_ptr(receiver, subs->dest.port)) == NULL)
1494                 goto __end;
1495 
1496         result = check_subscription_permission(client, sport, dport, subs);
1497         if (result < 0)
1498                 goto __end;
1499 
1500         result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, subs);
1501         if (! result) /* broadcast announce */
1502                 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1503                                                    subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1504       __end:
1505         if (sport)
1506                 snd_seq_port_unlock(sport);
1507         if (dport)
1508                 snd_seq_port_unlock(dport);
1509         if (sender)
1510                 snd_seq_client_unlock(sender);
1511         if (receiver)
1512                 snd_seq_client_unlock(receiver);
1513         return result;
1514 }
1515 
1516 
1517 /* CREATE_QUEUE ioctl() */
1518 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client, void *arg)
1519 {
1520         struct snd_seq_queue_info *info = arg;
1521         struct snd_seq_queue *q;
1522 
1523         q = snd_seq_queue_alloc(client->number, info->locked, info->flags);
1524         if (IS_ERR(q))
1525                 return PTR_ERR(q);
1526 
1527         info->queue = q->queue;
1528         info->locked = q->locked;
1529         info->owner = q->owner;
1530 
1531         /* set queue name */
1532         if (!info->name[0])
1533                 snprintf(info->name, sizeof(info->name), "Queue-%d", q->queue);
1534         strlcpy(q->name, info->name, sizeof(q->name));
1535         snd_use_lock_free(&q->use_lock);
1536 
1537         return 0;
1538 }
1539 
1540 /* DELETE_QUEUE ioctl() */
1541 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client, void *arg)
1542 {
1543         struct snd_seq_queue_info *info = arg;
1544 
1545         return snd_seq_queue_delete(client->number, info->queue);
1546 }
1547 
1548 /* GET_QUEUE_INFO ioctl() */
1549 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client,
1550                                         void *arg)
1551 {
1552         struct snd_seq_queue_info *info = arg;
1553         struct snd_seq_queue *q;
1554 
1555         q = queueptr(info->queue);
1556         if (q == NULL)
1557                 return -EINVAL;
1558 
1559         memset(info, 0, sizeof(*info));
1560         info->queue = q->queue;
1561         info->owner = q->owner;
1562         info->locked = q->locked;
1563         strlcpy(info->name, q->name, sizeof(info->name));
1564         queuefree(q);
1565 
1566         return 0;
1567 }
1568 
1569 /* SET_QUEUE_INFO ioctl() */
1570 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
1571                                         void *arg)
1572 {
1573         struct snd_seq_queue_info *info = arg;
1574         struct snd_seq_queue *q;
1575 
1576         if (info->owner != client->number)
1577                 return -EINVAL;
1578 
1579         /* change owner/locked permission */
1580         if (snd_seq_queue_check_access(info->queue, client->number)) {
1581                 if (snd_seq_queue_set_owner(info->queue, client->number, info->locked) < 0)
1582                         return -EPERM;
1583                 if (info->locked)
1584                         snd_seq_queue_use(info->queue, client->number, 1);
1585         } else {
1586                 return -EPERM;
1587         }       
1588 
1589         q = queueptr(info->queue);
1590         if (! q)
1591                 return -EINVAL;
1592         if (q->owner != client->number) {
1593                 queuefree(q);
1594                 return -EPERM;
1595         }
1596         strlcpy(q->name, info->name, sizeof(q->name));
1597         queuefree(q);
1598 
1599         return 0;
1600 }
1601 
1602 /* GET_NAMED_QUEUE ioctl() */
1603 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client,
1604                                          void *arg)
1605 {
1606         struct snd_seq_queue_info *info = arg;
1607         struct snd_seq_queue *q;
1608 
1609         q = snd_seq_queue_find_name(info->name);
1610         if (q == NULL)
1611                 return -EINVAL;
1612         info->queue = q->queue;
1613         info->owner = q->owner;
1614         info->locked = q->locked;
1615         queuefree(q);
1616 
1617         return 0;
1618 }
1619 
1620 /* GET_QUEUE_STATUS ioctl() */
1621 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
1622                                           void *arg)
1623 {
1624         struct snd_seq_queue_status *status = arg;
1625         struct snd_seq_queue *queue;
1626         struct snd_seq_timer *tmr;
1627 
1628         queue = queueptr(status->queue);
1629         if (queue == NULL)
1630                 return -EINVAL;
1631         memset(status, 0, sizeof(*status));
1632         status->queue = queue->queue;
1633         
1634         tmr = queue->timer;
1635         status->events = queue->tickq->cells + queue->timeq->cells;
1636 
1637         status->time = snd_seq_timer_get_cur_time(tmr);
1638         status->tick = snd_seq_timer_get_cur_tick(tmr);
1639 
1640         status->running = tmr->running;
1641 
1642         status->flags = queue->flags;
1643         queuefree(queue);
1644 
1645         return 0;
1646 }
1647 
1648 
1649 /* GET_QUEUE_TEMPO ioctl() */
1650 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
1651                                          void *arg)
1652 {
1653         struct snd_seq_queue_tempo *tempo = arg;
1654         struct snd_seq_queue *queue;
1655         struct snd_seq_timer *tmr;
1656 
1657         queue = queueptr(tempo->queue);
1658         if (queue == NULL)
1659                 return -EINVAL;
1660         memset(tempo, 0, sizeof(*tempo));
1661         tempo->queue = queue->queue;
1662         
1663         tmr = queue->timer;
1664 
1665         tempo->tempo = tmr->tempo;
1666         tempo->ppq = tmr->ppq;
1667         tempo->skew_value = tmr->skew;
1668         tempo->skew_base = tmr->skew_base;
1669         queuefree(queue);
1670 
1671         return 0;
1672 }
1673 
1674 
1675 /* SET_QUEUE_TEMPO ioctl() */
1676 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1677 {
1678         if (!snd_seq_queue_check_access(tempo->queue, client))
1679                 return -EPERM;
1680         return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1681 }
1682 EXPORT_SYMBOL(snd_seq_set_queue_tempo);
1683 
1684 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
1685                                          void *arg)
1686 {
1687         struct snd_seq_queue_tempo *tempo = arg;
1688         int result;
1689 
1690         result = snd_seq_set_queue_tempo(client->number, tempo);
1691         return result < 0 ? result : 0;
1692 }
1693 
1694 
1695 /* GET_QUEUE_TIMER ioctl() */
1696 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
1697                                          void *arg)
1698 {
1699         struct snd_seq_queue_timer *timer = arg;
1700         struct snd_seq_queue *queue;
1701         struct snd_seq_timer *tmr;
1702 
1703         queue = queueptr(timer->queue);
1704         if (queue == NULL)
1705                 return -EINVAL;
1706 
1707         if (mutex_lock_interruptible(&queue->timer_mutex)) {
1708                 queuefree(queue);
1709                 return -ERESTARTSYS;
1710         }
1711         tmr = queue->timer;
1712         memset(timer, 0, sizeof(*timer));
1713         timer->queue = queue->queue;
1714 
1715         timer->type = tmr->type;
1716         if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1717                 timer->u.alsa.id = tmr->alsa_id;
1718                 timer->u.alsa.resolution = tmr->preferred_resolution;
1719         }
1720         mutex_unlock(&queue->timer_mutex);
1721         queuefree(queue);
1722         
1723         return 0;
1724 }
1725 
1726 
1727 /* SET_QUEUE_TIMER ioctl() */
1728 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
1729                                          void *arg)
1730 {
1731         struct snd_seq_queue_timer *timer = arg;
1732         int result = 0;
1733 
1734         if (timer->type != SNDRV_SEQ_TIMER_ALSA)
1735                 return -EINVAL;
1736 
1737         if (snd_seq_queue_check_access(timer->queue, client->number)) {
1738                 struct snd_seq_queue *q;
1739                 struct snd_seq_timer *tmr;
1740 
1741                 q = queueptr(timer->queue);
1742                 if (q == NULL)
1743                         return -ENXIO;
1744                 if (mutex_lock_interruptible(&q->timer_mutex)) {
1745                         queuefree(q);
1746                         return -ERESTARTSYS;
1747                 }
1748                 tmr = q->timer;
1749                 snd_seq_queue_timer_close(timer->queue);
1750                 tmr->type = timer->type;
1751                 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1752                         tmr->alsa_id = timer->u.alsa.id;
1753                         tmr->preferred_resolution = timer->u.alsa.resolution;
1754                 }
1755                 result = snd_seq_queue_timer_open(timer->queue);
1756                 mutex_unlock(&q->timer_mutex);
1757                 queuefree(q);
1758         } else {
1759                 return -EPERM;
1760         }       
1761 
1762         return result;
1763 }
1764 
1765 
1766 /* GET_QUEUE_CLIENT ioctl() */
1767 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
1768                                           void *arg)
1769 {
1770         struct snd_seq_queue_client *info = arg;
1771         int used;
1772 
1773         used = snd_seq_queue_is_used(info->queue, client->number);
1774         if (used < 0)
1775                 return -EINVAL;
1776         info->used = used;
1777         info->client = client->number;
1778 
1779         return 0;
1780 }
1781 
1782 
1783 /* SET_QUEUE_CLIENT ioctl() */
1784 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
1785                                           void *arg)
1786 {
1787         struct snd_seq_queue_client *info = arg;
1788         int err;
1789 
1790         if (info->used >= 0) {
1791                 err = snd_seq_queue_use(info->queue, client->number, info->used);
1792                 if (err < 0)
1793                         return err;
1794         }
1795 
1796         return snd_seq_ioctl_get_queue_client(client, arg);
1797 }
1798 
1799 
1800 /* GET_CLIENT_POOL ioctl() */
1801 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
1802                                          void *arg)
1803 {
1804         struct snd_seq_client_pool *info = arg;
1805         struct snd_seq_client *cptr;
1806 
1807         cptr = snd_seq_client_use_ptr(info->client);
1808         if (cptr == NULL)
1809                 return -ENOENT;
1810         memset(info, 0, sizeof(*info));
1811         info->client = cptr->number;
1812         info->output_pool = cptr->pool->size;
1813         info->output_room = cptr->pool->room;
1814         info->output_free = info->output_pool;
1815         info->output_free = snd_seq_unused_cells(cptr->pool);
1816         if (cptr->type == USER_CLIENT) {
1817                 info->input_pool = cptr->data.user.fifo_pool_size;
1818                 info->input_free = info->input_pool;
1819                 if (cptr->data.user.fifo)
1820                         info->input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool);
1821         } else {
1822                 info->input_pool = 0;
1823                 info->input_free = 0;
1824         }
1825         snd_seq_client_unlock(cptr);
1826         
1827         return 0;
1828 }
1829 
1830 /* SET_CLIENT_POOL ioctl() */
1831 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
1832                                          void *arg)
1833 {
1834         struct snd_seq_client_pool *info = arg;
1835         int rc;
1836 
1837         if (client->number != info->client)
1838                 return -EINVAL; /* can't change other clients */
1839 
1840         if (info->output_pool >= 1 && info->output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1841             (! snd_seq_write_pool_allocated(client) ||
1842              info->output_pool != client->pool->size)) {
1843                 if (snd_seq_write_pool_allocated(client)) {
1844                         /* is the pool in use? */
1845                         if (atomic_read(&client->pool->counter))
1846                                 return -EBUSY;
1847                         /* remove all existing cells */
1848                         snd_seq_pool_mark_closing(client->pool);
1849                         snd_seq_pool_done(client->pool);
1850                 }
1851                 client->pool->size = info->output_pool;
1852                 rc = snd_seq_pool_init(client->pool);
1853                 if (rc < 0)
1854                         return rc;
1855         }
1856         if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
1857             info->input_pool >= 1 &&
1858             info->input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1859             info->input_pool != client->data.user.fifo_pool_size) {
1860                 /* change pool size */
1861                 rc = snd_seq_fifo_resize(client->data.user.fifo, info->input_pool);
1862                 if (rc < 0)
1863                         return rc;
1864                 client->data.user.fifo_pool_size = info->input_pool;
1865         }
1866         if (info->output_room >= 1 &&
1867             info->output_room <= client->pool->size) {
1868                 client->pool->room  = info->output_room;
1869         }
1870 
1871         return snd_seq_ioctl_get_client_pool(client, arg);
1872 }
1873 
1874 
1875 /* REMOVE_EVENTS ioctl() */
1876 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
1877                                        void *arg)
1878 {
1879         struct snd_seq_remove_events *info = arg;
1880 
1881         /*
1882          * Input mostly not implemented XXX.
1883          */
1884         if (info->remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1885                 /*
1886                  * No restrictions so for a user client we can clear
1887                  * the whole fifo
1888                  */
1889                 if (client->type == USER_CLIENT && client->data.user.fifo)
1890                         snd_seq_fifo_clear(client->data.user.fifo);
1891         }
1892 
1893         if (info->remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1894                 snd_seq_queue_remove_cells(client->number, info);
1895 
1896         return 0;
1897 }
1898 
1899 
1900 /*
1901  * get subscription info
1902  */
1903 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
1904                                           void *arg)
1905 {
1906         struct snd_seq_port_subscribe *subs = arg;
1907         int result;
1908         struct snd_seq_client *sender = NULL;
1909         struct snd_seq_client_port *sport = NULL;
1910         struct snd_seq_subscribers *p;
1911 
1912         result = -EINVAL;
1913         if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1914                 goto __end;
1915         if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1916                 goto __end;
1917         p = snd_seq_port_get_subscription(&sport->c_src, &subs->dest);
1918         if (p) {
1919                 result = 0;
1920                 *subs = p->info;
1921         } else
1922                 result = -ENOENT;
1923 
1924       __end:
1925         if (sport)
1926                 snd_seq_port_unlock(sport);
1927         if (sender)
1928                 snd_seq_client_unlock(sender);
1929 
1930         return result;
1931 }
1932 
1933 
1934 /*
1935  * get subscription info - check only its presence
1936  */
1937 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client, void *arg)
1938 {
1939         struct snd_seq_query_subs *subs = arg;
1940         int result = -ENXIO;
1941         struct snd_seq_client *cptr = NULL;
1942         struct snd_seq_client_port *port = NULL;
1943         struct snd_seq_port_subs_info *group;
1944         struct list_head *p;
1945         int i;
1946 
1947         if ((cptr = snd_seq_client_use_ptr(subs->root.client)) == NULL)
1948                 goto __end;
1949         if ((port = snd_seq_port_use_ptr(cptr, subs->root.port)) == NULL)
1950                 goto __end;
1951 
1952         switch (subs->type) {
1953         case SNDRV_SEQ_QUERY_SUBS_READ:
1954                 group = &port->c_src;
1955                 break;
1956         case SNDRV_SEQ_QUERY_SUBS_WRITE:
1957                 group = &port->c_dest;
1958                 break;
1959         default:
1960                 goto __end;
1961         }
1962 
1963         down_read(&group->list_mutex);
1964         /* search for the subscriber */
1965         subs->num_subs = group->count;
1966         i = 0;
1967         result = -ENOENT;
1968         list_for_each(p, &group->list_head) {
1969                 if (i++ == subs->index) {
1970                         /* found! */
1971                         struct snd_seq_subscribers *s;
1972                         if (subs->type == SNDRV_SEQ_QUERY_SUBS_READ) {
1973                                 s = list_entry(p, struct snd_seq_subscribers, src_list);
1974                                 subs->addr = s->info.dest;
1975                         } else {
1976                                 s = list_entry(p, struct snd_seq_subscribers, dest_list);
1977                                 subs->addr = s->info.sender;
1978                         }
1979                         subs->flags = s->info.flags;
1980                         subs->queue = s->info.queue;
1981                         result = 0;
1982                         break;
1983                 }
1984         }
1985         up_read(&group->list_mutex);
1986 
1987       __end:
1988         if (port)
1989                 snd_seq_port_unlock(port);
1990         if (cptr)
1991                 snd_seq_client_unlock(cptr);
1992 
1993         return result;
1994 }
1995 
1996 
1997 /*
1998  * query next client
1999  */
2000 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
2001                                            void *arg)
2002 {
2003         struct snd_seq_client_info *info = arg;
2004         struct snd_seq_client *cptr = NULL;
2005 
2006         /* search for next client */
2007         info->client++;
2008         if (info->client < 0)
2009                 info->client = 0;
2010         for (; info->client < SNDRV_SEQ_MAX_CLIENTS; info->client++) {
2011                 cptr = snd_seq_client_use_ptr(info->client);
2012                 if (cptr)
2013                         break; /* found */
2014         }
2015         if (cptr == NULL)
2016                 return -ENOENT;
2017 
2018         get_client_info(cptr, info);
2019         snd_seq_client_unlock(cptr);
2020 
2021         return 0;
2022 }
2023 
2024 /* 
2025  * query next port
2026  */
2027 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
2028                                          void *arg)
2029 {
2030         struct snd_seq_port_info *info = arg;
2031         struct snd_seq_client *cptr;
2032         struct snd_seq_client_port *port = NULL;
2033 
2034         cptr = snd_seq_client_use_ptr(info->addr.client);
2035         if (cptr == NULL)
2036                 return -ENXIO;
2037 
2038         /* search for next port */
2039         info->addr.port++;
2040         port = snd_seq_port_query_nearest(cptr, info);
2041         if (port == NULL) {
2042                 snd_seq_client_unlock(cptr);
2043                 return -ENOENT;
2044         }
2045 
2046         /* get port info */
2047         info->addr = port->addr;
2048         snd_seq_get_port_info(port, info);
2049         snd_seq_port_unlock(port);
2050         snd_seq_client_unlock(cptr);
2051 
2052         return 0;
2053 }
2054 
2055 /* -------------------------------------------------------- */
2056 
2057 static const struct ioctl_handler {
2058         unsigned int cmd;
2059         int (*func)(struct snd_seq_client *client, void *arg);
2060 } ioctl_handlers[] = {
2061         { SNDRV_SEQ_IOCTL_PVERSION, snd_seq_ioctl_pversion },
2062         { SNDRV_SEQ_IOCTL_CLIENT_ID, snd_seq_ioctl_client_id },
2063         { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2064         { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2065         { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2066         { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2067         { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2068         { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2069         { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2070         { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2071         { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2072         { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2073         { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2074         { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2075         { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2076         { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2077         { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2078         { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2079         { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2080         { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2081         { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2082         { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2083         { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2084         { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2085         { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2086         { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2087         { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2088         { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2089         { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2090         { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2091         { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2092         { 0, NULL },
2093 };
2094 
2095 static long snd_seq_ioctl(struct file *file, unsigned int cmd,
2096                           unsigned long arg)
2097 {
2098         struct snd_seq_client *client = file->private_data;
2099         /* To use kernel stack for ioctl data. */
2100         union {
2101                 int pversion;
2102                 int client_id;
2103                 struct snd_seq_system_info      system_info;
2104                 struct snd_seq_running_info     running_info;
2105                 struct snd_seq_client_info      client_info;
2106                 struct snd_seq_port_info        port_info;
2107                 struct snd_seq_port_subscribe   port_subscribe;
2108                 struct snd_seq_queue_info       queue_info;
2109                 struct snd_seq_queue_status     queue_status;
2110                 struct snd_seq_queue_tempo      tempo;
2111                 struct snd_seq_queue_timer      queue_timer;
2112                 struct snd_seq_queue_client     queue_client;
2113                 struct snd_seq_client_pool      client_pool;
2114                 struct snd_seq_remove_events    remove_events;
2115                 struct snd_seq_query_subs       query_subs;
2116         } buf;
2117         const struct ioctl_handler *handler;
2118         unsigned long size;
2119         int err;
2120 
2121         if (snd_BUG_ON(!client))
2122                 return -ENXIO;
2123 
2124         for (handler = ioctl_handlers; handler->cmd > 0; ++handler) {
2125                 if (handler->cmd == cmd)
2126                         break;
2127         }
2128         if (handler->cmd == 0)
2129                 return -ENOTTY;
2130 
2131         memset(&buf, 0, sizeof(buf));
2132 
2133         /*
2134          * All of ioctl commands for ALSA sequencer get an argument of size
2135          * within 13 bits. We can safely pick up the size from the command.
2136          */
2137         size = _IOC_SIZE(handler->cmd);
2138         if (handler->cmd & IOC_IN) {
2139                 if (copy_from_user(&buf, (const void __user *)arg, size))
2140                         return -EFAULT;
2141         }
2142 
2143         mutex_lock(&client->ioctl_mutex);
2144         err = handler->func(client, &buf);
2145         mutex_unlock(&client->ioctl_mutex);
2146         if (err >= 0) {
2147                 /* Some commands includes a bug in 'dir' field. */
2148                 if (handler->cmd == SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT ||
2149                     handler->cmd == SNDRV_SEQ_IOCTL_SET_CLIENT_POOL ||
2150                     (handler->cmd & IOC_OUT))
2151                         if (copy_to_user((void __user *)arg, &buf, size))
2152                                 return -EFAULT;
2153         }
2154 
2155         return err;
2156 }
2157 
2158 #ifdef CONFIG_COMPAT
2159 #include "seq_compat.c"
2160 #else
2161 #define snd_seq_ioctl_compat    NULL
2162 #endif
2163 
2164 /* -------------------------------------------------------- */
2165 
2166 
2167 /* exported to kernel modules */
2168 int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
2169                                  const char *name_fmt, ...)
2170 {
2171         struct snd_seq_client *client;
2172         va_list args;
2173 
2174         if (snd_BUG_ON(in_interrupt()))
2175                 return -EBUSY;
2176 
2177         if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD)
2178                 return -EINVAL;
2179         if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
2180                 return -EINVAL;
2181 
2182         if (mutex_lock_interruptible(&register_mutex))
2183                 return -ERESTARTSYS;
2184 
2185         if (card) {
2186                 client_index += SNDRV_SEQ_GLOBAL_CLIENTS
2187                         + card->number * SNDRV_SEQ_CLIENTS_PER_CARD;
2188                 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN)
2189                         client_index = -1;
2190         }
2191 
2192         /* empty write queue as default */
2193         client = seq_create_client1(client_index, 0);
2194         if (client == NULL) {
2195                 mutex_unlock(&register_mutex);
2196                 return -EBUSY;  /* failure code */
2197         }
2198         usage_alloc(&client_usage, 1);
2199 
2200         client->accept_input = 1;
2201         client->accept_output = 1;
2202         client->data.kernel.card = card;
2203                 
2204         va_start(args, name_fmt);
2205         vsnprintf(client->name, sizeof(client->name), name_fmt, args);
2206         va_end(args);
2207 
2208         client->type = KERNEL_CLIENT;
2209         mutex_unlock(&register_mutex);
2210 
2211         /* make others aware this new client */
2212         snd_seq_system_client_ev_client_start(client->number);
2213         
2214         /* return client number to caller */
2215         return client->number;
2216 }
2217 EXPORT_SYMBOL(snd_seq_create_kernel_client);
2218 
2219 /* exported to kernel modules */
2220 int snd_seq_delete_kernel_client(int client)
2221 {
2222         struct snd_seq_client *ptr;
2223 
2224         if (snd_BUG_ON(in_interrupt()))
2225                 return -EBUSY;
2226 
2227         ptr = clientptr(client);
2228         if (ptr == NULL)
2229                 return -EINVAL;
2230 
2231         seq_free_client(ptr);
2232         kfree(ptr);
2233         return 0;
2234 }
2235 EXPORT_SYMBOL(snd_seq_delete_kernel_client);
2236 
2237 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue
2238  * and snd_seq_kernel_client_enqueue_blocking
2239  */
2240 static int kernel_client_enqueue(int client, struct snd_seq_event *ev,
2241                                  struct file *file, int blocking,
2242                                  int atomic, int hop)
2243 {
2244         struct snd_seq_client *cptr;
2245         int result;
2246 
2247         if (snd_BUG_ON(!ev))
2248                 return -EINVAL;
2249 
2250         if (ev->type == SNDRV_SEQ_EVENT_NONE)
2251                 return 0; /* ignore this */
2252         if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2253                 return -EINVAL; /* quoted events can't be enqueued */
2254 
2255         /* fill in client number */
2256         ev->source.client = client;
2257 
2258         if (check_event_type_and_length(ev))
2259                 return -EINVAL;
2260 
2261         cptr = snd_seq_client_use_ptr(client);
2262         if (cptr == NULL)
2263                 return -EINVAL;
2264         
2265         if (! cptr->accept_output)
2266                 result = -EPERM;
2267         else /* send it */
2268                 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking,
2269                                                       atomic, hop, NULL);
2270 
2271         snd_seq_client_unlock(cptr);
2272         return result;
2273 }
2274 
2275 /*
2276  * exported, called by kernel clients to enqueue events (w/o blocking)
2277  *
2278  * RETURN VALUE: zero if succeed, negative if error
2279  */
2280 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev,
2281                                   int atomic, int hop)
2282 {
2283         return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop);
2284 }
2285 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
2286 
2287 /*
2288  * exported, called by kernel clients to enqueue events (with blocking)
2289  *
2290  * RETURN VALUE: zero if succeed, negative if error
2291  */
2292 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev,
2293                                            struct file *file,
2294                                            int atomic, int hop)
2295 {
2296         return kernel_client_enqueue(client, ev, file, 1, atomic, hop);
2297 }
2298 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking);
2299 
2300 /* 
2301  * exported, called by kernel clients to dispatch events directly to other
2302  * clients, bypassing the queues.  Event time-stamp will be updated.
2303  *
2304  * RETURN VALUE: negative = delivery failed,
2305  *               zero, or positive: the number of delivered events
2306  */
2307 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev,
2308                                    int atomic, int hop)
2309 {
2310         struct snd_seq_client *cptr;
2311         int result;
2312 
2313         if (snd_BUG_ON(!ev))
2314                 return -EINVAL;
2315 
2316         /* fill in client number */
2317         ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2318         ev->source.client = client;
2319 
2320         if (check_event_type_and_length(ev))
2321                 return -EINVAL;
2322 
2323         cptr = snd_seq_client_use_ptr(client);
2324         if (cptr == NULL)
2325                 return -EINVAL;
2326 
2327         if (!cptr->accept_output)
2328                 result = -EPERM;
2329         else
2330                 result = snd_seq_deliver_event(cptr, ev, atomic, hop);
2331 
2332         snd_seq_client_unlock(cptr);
2333         return result;
2334 }
2335 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch);
2336 
2337 /**
2338  * snd_seq_kernel_client_ctl - operate a command for a client with data in
2339  *                             kernel space.
2340  * @clientid:   A numerical ID for a client.
2341  * @cmd:        An ioctl(2) command for ALSA sequencer operation.
2342  * @arg:        A pointer to data in kernel space.
2343  *
2344  * Against its name, both kernel/application client can be handled by this
2345  * kernel API. A pointer of 'arg' argument should be in kernel space.
2346  *
2347  * Return: 0 at success. Negative error code at failure.
2348  */
2349 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2350 {
2351         const struct ioctl_handler *handler;
2352         struct snd_seq_client *client;
2353 
2354         client = clientptr(clientid);
2355         if (client == NULL)
2356                 return -ENXIO;
2357 
2358         for (handler = ioctl_handlers; handler->cmd > 0; ++handler) {
2359                 if (handler->cmd == cmd)
2360                         return handler->func(client, arg);
2361         }
2362 
2363         pr_debug("ALSA: seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n",
2364                  cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2365         return -ENOTTY;
2366 }
2367 EXPORT_SYMBOL(snd_seq_kernel_client_ctl);
2368 
2369 /* exported (for OSS emulator) */
2370 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2371 {
2372         struct snd_seq_client *client;
2373 
2374         client = clientptr(clientid);
2375         if (client == NULL)
2376                 return -ENXIO;
2377 
2378         if (! snd_seq_write_pool_allocated(client))
2379                 return 1;
2380         if (snd_seq_pool_poll_wait(client->pool, file, wait))
2381                 return 1;
2382         return 0;
2383 }
2384 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll);
2385 
2386 /*---------------------------------------------------------------------------*/
2387 
2388 #ifdef CONFIG_SND_PROC_FS
2389 /*
2390  *  /proc interface
2391  */
2392 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer,
2393                                           struct snd_seq_port_subs_info *group,
2394                                           int is_src, char *msg)
2395 {
2396         struct list_head *p;
2397         struct snd_seq_subscribers *s;
2398         int count = 0;
2399 
2400         down_read(&group->list_mutex);
2401         if (list_empty(&group->list_head)) {
2402                 up_read(&group->list_mutex);
2403                 return;
2404         }
2405         snd_iprintf(buffer, msg);
2406         list_for_each(p, &group->list_head) {
2407                 if (is_src)
2408                         s = list_entry(p, struct snd_seq_subscribers, src_list);
2409                 else
2410                         s = list_entry(p, struct snd_seq_subscribers, dest_list);
2411                 if (count++)
2412                         snd_iprintf(buffer, ", ");
2413                 snd_iprintf(buffer, "%d:%d",
2414                             is_src ? s->info.dest.client : s->info.sender.client,
2415                             is_src ? s->info.dest.port : s->info.sender.port);
2416                 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
2417                         snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
2418                 if (group->exclusive)
2419                         snd_iprintf(buffer, "[ex]");
2420         }
2421         up_read(&group->list_mutex);
2422         snd_iprintf(buffer, "\n");
2423 }
2424 
2425 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
2426 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
2427 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
2428 
2429 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2430 
2431 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
2432                                     struct snd_seq_client *client)
2433 {
2434         struct snd_seq_client_port *p;
2435 
2436         mutex_lock(&client->ports_mutex);
2437         list_for_each_entry(p, &client->ports_list_head, list) {
2438                 snd_iprintf(buffer, "  Port %3d : \"%s\" (%c%c%c%c)\n",
2439                             p->addr.port, p->name,
2440                             FLAG_PERM_RD(p->capability),
2441                             FLAG_PERM_WR(p->capability),
2442                             FLAG_PERM_EX(p->capability),
2443                             FLAG_PERM_DUPLEX(p->capability));
2444                 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, "    Connecting To: ");
2445                 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, "    Connected From: ");
2446         }
2447         mutex_unlock(&client->ports_mutex);
2448 }
2449 
2450 
2451 /* exported to seq_info.c */
2452 void snd_seq_info_clients_read(struct snd_info_entry *entry, 
2453                                struct snd_info_buffer *buffer)
2454 {
2455         int c;
2456         struct snd_seq_client *client;
2457 
2458         snd_iprintf(buffer, "Client info\n");
2459         snd_iprintf(buffer, "  cur  clients : %d\n", client_usage.cur);
2460         snd_iprintf(buffer, "  peak clients : %d\n", client_usage.peak);
2461         snd_iprintf(buffer, "  max  clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
2462         snd_iprintf(buffer, "\n");
2463 
2464         /* list the client table */
2465         for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2466                 client = snd_seq_client_use_ptr(c);
2467                 if (client == NULL)
2468                         continue;
2469                 if (client->type == NO_CLIENT) {
2470                         snd_seq_client_unlock(client);
2471                         continue;
2472                 }
2473 
2474                 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n",
2475                             c, client->name,
2476                             client->type == USER_CLIENT ? "User" : "Kernel");
2477                 snd_seq_info_dump_ports(buffer, client);
2478                 if (snd_seq_write_pool_allocated(client)) {
2479                         snd_iprintf(buffer, "  Output pool :\n");
2480                         snd_seq_info_pool(buffer, client->pool, "    ");
2481                 }
2482                 if (client->type == USER_CLIENT && client->data.user.fifo &&
2483                     client->data.user.fifo->pool) {
2484                         snd_iprintf(buffer, "  Input pool :\n");
2485                         snd_seq_info_pool(buffer, client->data.user.fifo->pool, "    ");
2486                 }
2487                 snd_seq_client_unlock(client);
2488         }
2489 }
2490 #endif /* CONFIG_SND_PROC_FS */
2491 
2492 /*---------------------------------------------------------------------------*/
2493 
2494 
2495 /*
2496  *  REGISTRATION PART
2497  */
2498 
2499 static const struct file_operations snd_seq_f_ops =
2500 {
2501         .owner =        THIS_MODULE,
2502         .read =         snd_seq_read,
2503         .write =        snd_seq_write,
2504         .open =         snd_seq_open,
2505         .release =      snd_seq_release,
2506         .llseek =       no_llseek,
2507         .poll =         snd_seq_poll,
2508         .unlocked_ioctl =       snd_seq_ioctl,
2509         .compat_ioctl = snd_seq_ioctl_compat,
2510 };
2511 
2512 static struct device seq_dev;
2513 
2514 /* 
2515  * register sequencer device 
2516  */
2517 int __init snd_sequencer_device_init(void)
2518 {
2519         int err;
2520 
2521         snd_device_initialize(&seq_dev, NULL);
2522         dev_set_name(&seq_dev, "seq");
2523 
2524         if (mutex_lock_interruptible(&register_mutex))
2525                 return -ERESTARTSYS;
2526 
2527         err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
2528                                   &snd_seq_f_ops, NULL, &seq_dev);
2529         if (err < 0) {
2530                 mutex_unlock(&register_mutex);
2531                 put_device(&seq_dev);
2532                 return err;
2533         }
2534         
2535         mutex_unlock(&register_mutex);
2536 
2537         return 0;
2538 }
2539 
2540 
2541 
2542 /* 
2543  * unregister sequencer device 
2544  */
2545 void __exit snd_sequencer_device_done(void)
2546 {
2547         snd_unregister_device(&seq_dev);
2548         put_device(&seq_dev);
2549 }
2550 

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