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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 
225         /* find free slot in the client table */
226         spin_lock_irqsave(&clients_lock, flags);
227         if (client_index < 0) {
228                 for (c = SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN;
229                      c < SNDRV_SEQ_MAX_CLIENTS;
230                      c++) {
231                         if (clienttab[c] || clienttablock[c])
232                                 continue;
233                         clienttab[client->number = c] = client;
234                         spin_unlock_irqrestore(&clients_lock, flags);
235                         return client;
236                 }
237         } else {
238                 if (clienttab[client_index] == NULL && !clienttablock[client_index]) {
239                         clienttab[client->number = client_index] = client;
240                         spin_unlock_irqrestore(&clients_lock, flags);
241                         return client;
242                 }
243         }
244         spin_unlock_irqrestore(&clients_lock, flags);
245         snd_seq_pool_delete(&client->pool);
246         kfree(client);
247         return NULL;    /* no free slot found or busy, return failure code */
248 }
249 
250 
251 static int seq_free_client1(struct snd_seq_client *client)
252 {
253         unsigned long flags;
254 
255         if (!client)
256                 return 0;
257         snd_seq_delete_all_ports(client);
258         snd_seq_queue_client_leave(client->number);
259         spin_lock_irqsave(&clients_lock, flags);
260         clienttablock[client->number] = 1;
261         clienttab[client->number] = NULL;
262         spin_unlock_irqrestore(&clients_lock, flags);
263         snd_use_lock_sync(&client->use_lock);
264         snd_seq_queue_client_termination(client->number);
265         if (client->pool)
266                 snd_seq_pool_delete(&client->pool);
267         spin_lock_irqsave(&clients_lock, flags);
268         clienttablock[client->number] = 0;
269         spin_unlock_irqrestore(&clients_lock, flags);
270         return 0;
271 }
272 
273 
274 static void seq_free_client(struct snd_seq_client * client)
275 {
276         mutex_lock(&register_mutex);
277         switch (client->type) {
278         case NO_CLIENT:
279                 pr_warn("ALSA: seq: Trying to free unused client %d\n",
280                         client->number);
281                 break;
282         case USER_CLIENT:
283         case KERNEL_CLIENT:
284                 seq_free_client1(client);
285                 usage_free(&client_usage, 1);
286                 break;
287 
288         default:
289                 pr_err("ALSA: seq: Trying to free client %d with undefined type = %d\n",
290                            client->number, client->type);
291         }
292         mutex_unlock(&register_mutex);
293 
294         snd_seq_system_client_ev_client_exit(client->number);
295 }
296 
297 
298 
299 /* -------------------------------------------------------- */
300 
301 /* create a user client */
302 static int snd_seq_open(struct inode *inode, struct file *file)
303 {
304         int c, mode;                    /* client id */
305         struct snd_seq_client *client;
306         struct snd_seq_user_client *user;
307         int err;
308 
309         err = nonseekable_open(inode, file);
310         if (err < 0)
311                 return err;
312 
313         if (mutex_lock_interruptible(&register_mutex))
314                 return -ERESTARTSYS;
315         client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS);
316         if (client == NULL) {
317                 mutex_unlock(&register_mutex);
318                 return -ENOMEM; /* failure code */
319         }
320 
321         mode = snd_seq_file_flags(file);
322         if (mode & SNDRV_SEQ_LFLG_INPUT)
323                 client->accept_input = 1;
324         if (mode & SNDRV_SEQ_LFLG_OUTPUT)
325                 client->accept_output = 1;
326 
327         user = &client->data.user;
328         user->fifo = NULL;
329         user->fifo_pool_size = 0;
330 
331         if (mode & SNDRV_SEQ_LFLG_INPUT) {
332                 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS;
333                 user->fifo = snd_seq_fifo_new(user->fifo_pool_size);
334                 if (user->fifo == NULL) {
335                         seq_free_client1(client);
336                         kfree(client);
337                         mutex_unlock(&register_mutex);
338                         return -ENOMEM;
339                 }
340         }
341 
342         usage_alloc(&client_usage, 1);
343         client->type = USER_CLIENT;
344         mutex_unlock(&register_mutex);
345 
346         c = client->number;
347         file->private_data = client;
348 
349         /* fill client data */
350         user->file = file;
351         sprintf(client->name, "Client-%d", c);
352         client->data.user.owner = get_pid(task_pid(current));
353 
354         /* make others aware this new client */
355         snd_seq_system_client_ev_client_start(c);
356 
357         return 0;
358 }
359 
360 /* delete a user client */
361 static int snd_seq_release(struct inode *inode, struct file *file)
362 {
363         struct snd_seq_client *client = file->private_data;
364 
365         if (client) {
366                 seq_free_client(client);
367                 if (client->data.user.fifo)
368                         snd_seq_fifo_delete(&client->data.user.fifo);
369                 put_pid(client->data.user.owner);
370                 kfree(client);
371         }
372 
373         return 0;
374 }
375 
376 
377 /* handle client read() */
378 /* possible error values:
379  *      -ENXIO  invalid client or file open mode
380  *      -ENOSPC FIFO overflow (the flag is cleared after this error report)
381  *      -EINVAL no enough user-space buffer to write the whole event
382  *      -EFAULT seg. fault during copy to user space
383  */
384 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count,
385                             loff_t *offset)
386 {
387         struct snd_seq_client *client = file->private_data;
388         struct snd_seq_fifo *fifo;
389         int err;
390         long result = 0;
391         struct snd_seq_event_cell *cell;
392 
393         if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT))
394                 return -ENXIO;
395 
396         if (!access_ok(VERIFY_WRITE, buf, count))
397                 return -EFAULT;
398 
399         /* check client structures are in place */
400         if (snd_BUG_ON(!client))
401                 return -ENXIO;
402 
403         if (!client->accept_input || (fifo = client->data.user.fifo) == NULL)
404                 return -ENXIO;
405 
406         if (atomic_read(&fifo->overflow) > 0) {
407                 /* buffer overflow is detected */
408                 snd_seq_fifo_clear(fifo);
409                 /* return error code */
410                 return -ENOSPC;
411         }
412 
413         cell = NULL;
414         err = 0;
415         snd_seq_fifo_lock(fifo);
416 
417         /* while data available in queue */
418         while (count >= sizeof(struct snd_seq_event)) {
419                 int nonblock;
420 
421                 nonblock = (file->f_flags & O_NONBLOCK) || result > 0;
422                 if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) {
423                         break;
424                 }
425                 if (snd_seq_ev_is_variable(&cell->event)) {
426                         struct snd_seq_event tmpev;
427                         tmpev = cell->event;
428                         tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
429                         if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) {
430                                 err = -EFAULT;
431                                 break;
432                         }
433                         count -= sizeof(struct snd_seq_event);
434                         buf += sizeof(struct snd_seq_event);
435                         err = snd_seq_expand_var_event(&cell->event, count,
436                                                        (char __force *)buf, 0,
437                                                        sizeof(struct snd_seq_event));
438                         if (err < 0)
439                                 break;
440                         result += err;
441                         count -= err;
442                         buf += err;
443                 } else {
444                         if (copy_to_user(buf, &cell->event, sizeof(struct snd_seq_event))) {
445                                 err = -EFAULT;
446                                 break;
447                         }
448                         count -= sizeof(struct snd_seq_event);
449                         buf += sizeof(struct snd_seq_event);
450                 }
451                 snd_seq_cell_free(cell);
452                 cell = NULL; /* to be sure */
453                 result += sizeof(struct snd_seq_event);
454         }
455 
456         if (err < 0) {
457                 if (cell)
458                         snd_seq_fifo_cell_putback(fifo, cell);
459                 if (err == -EAGAIN && result > 0)
460                         err = 0;
461         }
462         snd_seq_fifo_unlock(fifo);
463 
464         return (err < 0) ? err : result;
465 }
466 
467 
468 /*
469  * check access permission to the port
470  */
471 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags)
472 {
473         if ((port->capability & flags) != flags)
474                 return 0;
475         return flags;
476 }
477 
478 /*
479  * check if the destination client is available, and return the pointer
480  * if filter is non-zero, client filter bitmap is tested.
481  */
482 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event,
483                                                     int filter)
484 {
485         struct snd_seq_client *dest;
486 
487         dest = snd_seq_client_use_ptr(event->dest.client);
488         if (dest == NULL)
489                 return NULL;
490         if (! dest->accept_input)
491                 goto __not_avail;
492         if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) &&
493             ! test_bit(event->type, dest->event_filter))
494                 goto __not_avail;
495         if (filter && !(dest->filter & filter))
496                 goto __not_avail;
497 
498         return dest; /* ok - accessible */
499 __not_avail:
500         snd_seq_client_unlock(dest);
501         return NULL;
502 }
503 
504 
505 /*
506  * Return the error event.
507  *
508  * If the receiver client is a user client, the original event is
509  * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event.  If
510  * the original event is also variable length, the external data is
511  * copied after the event record. 
512  * If the receiver client is a kernel client, the original event is
513  * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra
514  * kmalloc.
515  */
516 static int bounce_error_event(struct snd_seq_client *client,
517                               struct snd_seq_event *event,
518                               int err, int atomic, int hop)
519 {
520         struct snd_seq_event bounce_ev;
521         int result;
522 
523         if (client == NULL ||
524             ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) ||
525             ! client->accept_input)
526                 return 0; /* ignored */
527 
528         /* set up quoted error */
529         memset(&bounce_ev, 0, sizeof(bounce_ev));
530         bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR;
531         bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED;
532         bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT;
533         bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
534         bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
535         bounce_ev.dest.client = client->number;
536         bounce_ev.dest.port = event->source.port;
537         bounce_ev.data.quote.origin = event->dest;
538         bounce_ev.data.quote.event = event;
539         bounce_ev.data.quote.value = -err; /* use positive value */
540         result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1);
541         if (result < 0) {
542                 client->event_lost++;
543                 return result;
544         }
545 
546         return result;
547 }
548 
549 
550 /*
551  * rewrite the time-stamp of the event record with the curren time
552  * of the given queue.
553  * return non-zero if updated.
554  */
555 static int update_timestamp_of_queue(struct snd_seq_event *event,
556                                      int queue, int real_time)
557 {
558         struct snd_seq_queue *q;
559 
560         q = queueptr(queue);
561         if (! q)
562                 return 0;
563         event->queue = queue;
564         event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK;
565         if (real_time) {
566                 event->time.time = snd_seq_timer_get_cur_time(q->timer);
567                 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL;
568         } else {
569                 event->time.tick = snd_seq_timer_get_cur_tick(q->timer);
570                 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK;
571         }
572         queuefree(q);
573         return 1;
574 }
575 
576 
577 /*
578  * deliver an event to the specified destination.
579  * if filter is non-zero, client filter bitmap is tested.
580  *
581  *  RETURN VALUE: 0 : if succeeded
582  *               <0 : error
583  */
584 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
585                                         struct snd_seq_event *event,
586                                         int filter, int atomic, int hop)
587 {
588         struct snd_seq_client *dest = NULL;
589         struct snd_seq_client_port *dest_port = NULL;
590         int result = -ENOENT;
591         int direct;
592 
593         direct = snd_seq_ev_is_direct(event);
594 
595         dest = get_event_dest_client(event, filter);
596         if (dest == NULL)
597                 goto __skip;
598         dest_port = snd_seq_port_use_ptr(dest, event->dest.port);
599         if (dest_port == NULL)
600                 goto __skip;
601 
602         /* check permission */
603         if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) {
604                 result = -EPERM;
605                 goto __skip;
606         }
607                 
608         if (dest_port->timestamping)
609                 update_timestamp_of_queue(event, dest_port->time_queue,
610                                           dest_port->time_real);
611 
612         switch (dest->type) {
613         case USER_CLIENT:
614                 if (dest->data.user.fifo)
615                         result = snd_seq_fifo_event_in(dest->data.user.fifo, event);
616                 break;
617 
618         case KERNEL_CLIENT:
619                 if (dest_port->event_input == NULL)
620                         break;
621                 result = dest_port->event_input(event, direct,
622                                                 dest_port->private_data,
623                                                 atomic, hop);
624                 break;
625         default:
626                 break;
627         }
628 
629   __skip:
630         if (dest_port)
631                 snd_seq_port_unlock(dest_port);
632         if (dest)
633                 snd_seq_client_unlock(dest);
634 
635         if (result < 0 && !direct) {
636                 result = bounce_error_event(client, event, result, atomic, hop);
637         }
638         return result;
639 }
640 
641 
642 /*
643  * send the event to all subscribers:
644  */
645 static int deliver_to_subscribers(struct snd_seq_client *client,
646                                   struct snd_seq_event *event,
647                                   int atomic, int hop)
648 {
649         struct snd_seq_subscribers *subs;
650         int err, result = 0, num_ev = 0;
651         struct snd_seq_event event_saved;
652         struct snd_seq_client_port *src_port;
653         struct snd_seq_port_subs_info *grp;
654 
655         src_port = snd_seq_port_use_ptr(client, event->source.port);
656         if (src_port == NULL)
657                 return -EINVAL; /* invalid source port */
658         /* save original event record */
659         event_saved = *event;
660         grp = &src_port->c_src;
661         
662         /* lock list */
663         if (atomic)
664                 read_lock(&grp->list_lock);
665         else
666                 down_read(&grp->list_mutex);
667         list_for_each_entry(subs, &grp->list_head, src_list) {
668                 /* both ports ready? */
669                 if (atomic_read(&subs->ref_count) != 2)
670                         continue;
671                 event->dest = subs->info.dest;
672                 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
673                         /* convert time according to flag with subscription */
674                         update_timestamp_of_queue(event, subs->info.queue,
675                                                   subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL);
676                 err = snd_seq_deliver_single_event(client, event,
677                                                    0, atomic, hop);
678                 if (err < 0) {
679                         /* save first error that occurs and continue */
680                         if (!result)
681                                 result = err;
682                         continue;
683                 }
684                 num_ev++;
685                 /* restore original event record */
686                 *event = event_saved;
687         }
688         if (atomic)
689                 read_unlock(&grp->list_lock);
690         else
691                 up_read(&grp->list_mutex);
692         *event = event_saved; /* restore */
693         snd_seq_port_unlock(src_port);
694         return (result < 0) ? result : num_ev;
695 }
696 
697 
698 #ifdef SUPPORT_BROADCAST 
699 /*
700  * broadcast to all ports:
701  */
702 static int port_broadcast_event(struct snd_seq_client *client,
703                                 struct snd_seq_event *event,
704                                 int atomic, int hop)
705 {
706         int num_ev = 0, err, result = 0;
707         struct snd_seq_client *dest_client;
708         struct snd_seq_client_port *port;
709 
710         dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST);
711         if (dest_client == NULL)
712                 return 0; /* no matching destination */
713 
714         read_lock(&dest_client->ports_lock);
715         list_for_each_entry(port, &dest_client->ports_list_head, list) {
716                 event->dest.port = port->addr.port;
717                 /* pass NULL as source client to avoid error bounce */
718                 err = snd_seq_deliver_single_event(NULL, event,
719                                                    SNDRV_SEQ_FILTER_BROADCAST,
720                                                    atomic, hop);
721                 if (err < 0) {
722                         /* save first error that occurs and continue */
723                         if (!result)
724                                 result = err;
725                         continue;
726                 }
727                 num_ev++;
728         }
729         read_unlock(&dest_client->ports_lock);
730         snd_seq_client_unlock(dest_client);
731         event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */
732         return (result < 0) ? result : num_ev;
733 }
734 
735 /*
736  * send the event to all clients:
737  * if destination port is also ADDRESS_BROADCAST, deliver to all ports.
738  */
739 static int broadcast_event(struct snd_seq_client *client,
740                            struct snd_seq_event *event, int atomic, int hop)
741 {
742         int err, result = 0, num_ev = 0;
743         int dest;
744         struct snd_seq_addr addr;
745 
746         addr = event->dest; /* save */
747 
748         for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) {
749                 /* don't send to itself */
750                 if (dest == client->number)
751                         continue;
752                 event->dest.client = dest;
753                 event->dest.port = addr.port;
754                 if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST)
755                         err = port_broadcast_event(client, event, atomic, hop);
756                 else
757                         /* pass NULL as source client to avoid error bounce */
758                         err = snd_seq_deliver_single_event(NULL, event,
759                                                            SNDRV_SEQ_FILTER_BROADCAST,
760                                                            atomic, hop);
761                 if (err < 0) {
762                         /* save first error that occurs and continue */
763                         if (!result)
764                                 result = err;
765                         continue;
766                 }
767                 num_ev += err;
768         }
769         event->dest = addr; /* restore */
770         return (result < 0) ? result : num_ev;
771 }
772 
773 
774 /* multicast - not supported yet */
775 static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event,
776                            int atomic, int hop)
777 {
778         pr_debug("ALSA: seq: multicast not supported yet.\n");
779         return 0; /* ignored */
780 }
781 #endif /* SUPPORT_BROADCAST */
782 
783 
784 /* deliver an event to the destination port(s).
785  * if the event is to subscribers or broadcast, the event is dispatched
786  * to multiple targets.
787  *
788  * RETURN VALUE: n > 0  : the number of delivered events.
789  *               n == 0 : the event was not passed to any client.
790  *               n < 0  : error - event was not processed.
791  */
792 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event,
793                                  int atomic, int hop)
794 {
795         int result;
796 
797         hop++;
798         if (hop >= SNDRV_SEQ_MAX_HOPS) {
799                 pr_debug("ALSA: seq: too long delivery path (%d:%d->%d:%d)\n",
800                            event->source.client, event->source.port,
801                            event->dest.client, event->dest.port);
802                 return -EMLINK;
803         }
804 
805         if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS ||
806             event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS)
807                 result = deliver_to_subscribers(client, event, atomic, hop);
808 #ifdef SUPPORT_BROADCAST
809         else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST ||
810                  event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST)
811                 result = broadcast_event(client, event, atomic, hop);
812         else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS)
813                 result = multicast_event(client, event, atomic, hop);
814         else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST)
815                 result = port_broadcast_event(client, event, atomic, hop);
816 #endif
817         else
818                 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop);
819 
820         return result;
821 }
822 
823 /*
824  * dispatch an event cell:
825  * This function is called only from queue check routines in timer
826  * interrupts or after enqueued.
827  * The event cell shall be released or re-queued in this function.
828  *
829  * RETURN VALUE: n > 0  : the number of delivered events.
830  *               n == 0 : the event was not passed to any client.
831  *               n < 0  : error - event was not processed.
832  */
833 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop)
834 {
835         struct snd_seq_client *client;
836         int result;
837 
838         if (snd_BUG_ON(!cell))
839                 return -EINVAL;
840 
841         client = snd_seq_client_use_ptr(cell->event.source.client);
842         if (client == NULL) {
843                 snd_seq_cell_free(cell); /* release this cell */
844                 return -EINVAL;
845         }
846 
847         if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) {
848                 /* NOTE event:
849                  * the event cell is re-used as a NOTE-OFF event and
850                  * enqueued again.
851                  */
852                 struct snd_seq_event tmpev, *ev;
853 
854                 /* reserve this event to enqueue note-off later */
855                 tmpev = cell->event;
856                 tmpev.type = SNDRV_SEQ_EVENT_NOTEON;
857                 result = snd_seq_deliver_event(client, &tmpev, atomic, hop);
858 
859                 /*
860                  * This was originally a note event.  We now re-use the
861                  * cell for the note-off event.
862                  */
863 
864                 ev = &cell->event;
865                 ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
866                 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH;
867 
868                 /* add the duration time */
869                 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) {
870                 case SNDRV_SEQ_TIME_STAMP_TICK:
871                         ev->time.tick += ev->data.note.duration;
872                         break;
873                 case SNDRV_SEQ_TIME_STAMP_REAL:
874                         /* unit for duration is ms */
875                         ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000);
876                         ev->time.time.tv_sec += ev->data.note.duration / 1000 +
877                                                 ev->time.time.tv_nsec / 1000000000;
878                         ev->time.time.tv_nsec %= 1000000000;
879                         break;
880                 }
881                 ev->data.note.velocity = ev->data.note.off_velocity;
882 
883                 /* Now queue this cell as the note off event */
884                 if (snd_seq_enqueue_event(cell, atomic, hop) < 0)
885                         snd_seq_cell_free(cell); /* release this cell */
886 
887         } else {
888                 /* Normal events:
889                  * event cell is freed after processing the event
890                  */
891 
892                 result = snd_seq_deliver_event(client, &cell->event, atomic, hop);
893                 snd_seq_cell_free(cell);
894         }
895 
896         snd_seq_client_unlock(client);
897         return result;
898 }
899 
900 
901 /* Allocate a cell from client pool and enqueue it to queue:
902  * if pool is empty and blocking is TRUE, sleep until a new cell is
903  * available.
904  */
905 static int snd_seq_client_enqueue_event(struct snd_seq_client *client,
906                                         struct snd_seq_event *event,
907                                         struct file *file, int blocking,
908                                         int atomic, int hop)
909 {
910         struct snd_seq_event_cell *cell;
911         int err;
912 
913         /* special queue values - force direct passing */
914         if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
915                 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
916                 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
917         } else
918 #ifdef SUPPORT_BROADCAST
919                 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) {
920                         event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST;
921                         event->queue = SNDRV_SEQ_QUEUE_DIRECT;
922                 }
923 #endif
924         if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
925                 /* check presence of source port */
926                 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port);
927                 if (src_port == NULL)
928                         return -EINVAL;
929                 snd_seq_port_unlock(src_port);
930         }
931 
932         /* direct event processing without enqueued */
933         if (snd_seq_ev_is_direct(event)) {
934                 if (event->type == SNDRV_SEQ_EVENT_NOTE)
935                         return -EINVAL; /* this event must be enqueued! */
936                 return snd_seq_deliver_event(client, event, atomic, hop);
937         }
938 
939         /* Not direct, normal queuing */
940         if (snd_seq_queue_is_used(event->queue, client->number) <= 0)
941                 return -EINVAL;  /* invalid queue */
942         if (! snd_seq_write_pool_allocated(client))
943                 return -ENXIO; /* queue is not allocated */
944 
945         /* allocate an event cell */
946         err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, file);
947         if (err < 0)
948                 return err;
949 
950         /* we got a cell. enqueue it. */
951         if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
952                 snd_seq_cell_free(cell);
953                 return err;
954         }
955 
956         return 0;
957 }
958 
959 
960 /*
961  * check validity of event type and data length.
962  * return non-zero if invalid.
963  */
964 static int check_event_type_and_length(struct snd_seq_event *ev)
965 {
966         switch (snd_seq_ev_length_type(ev)) {
967         case SNDRV_SEQ_EVENT_LENGTH_FIXED:
968                 if (snd_seq_ev_is_variable_type(ev))
969                         return -EINVAL;
970                 break;
971         case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
972                 if (! snd_seq_ev_is_variable_type(ev) ||
973                     (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
974                         return -EINVAL;
975                 break;
976         case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
977                 if (! snd_seq_ev_is_direct(ev))
978                         return -EINVAL;
979                 break;
980         }
981         return 0;
982 }
983 
984 
985 /* handle write() */
986 /* possible error values:
987  *      -ENXIO  invalid client or file open mode
988  *      -ENOMEM malloc failed
989  *      -EFAULT seg. fault during copy from user space
990  *      -EINVAL invalid event
991  *      -EAGAIN no space in output pool
992  *      -EINTR  interrupts while sleep
993  *      -EMLINK too many hops
994  *      others  depends on return value from driver callback
995  */
996 static ssize_t snd_seq_write(struct file *file, const char __user *buf,
997                              size_t count, loff_t *offset)
998 {
999         struct snd_seq_client *client = file->private_data;
1000         int written = 0, len;
1001         int err = -EINVAL;
1002         struct snd_seq_event event;
1003 
1004         if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
1005                 return -ENXIO;
1006 
1007         /* check client structures are in place */
1008         if (snd_BUG_ON(!client))
1009                 return -ENXIO;
1010                 
1011         if (!client->accept_output || client->pool == NULL)
1012                 return -ENXIO;
1013 
1014         /* allocate the pool now if the pool is not allocated yet */ 
1015         if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
1016                 if (snd_seq_pool_init(client->pool) < 0)
1017                         return -ENOMEM;
1018         }
1019 
1020         /* only process whole events */
1021         while (count >= sizeof(struct snd_seq_event)) {
1022                 /* Read in the event header from the user */
1023                 len = sizeof(event);
1024                 if (copy_from_user(&event, buf, len)) {
1025                         err = -EFAULT;
1026                         break;
1027                 }
1028                 event.source.client = client->number;   /* fill in client number */
1029                 /* Check for extension data length */
1030                 if (check_event_type_and_length(&event)) {
1031                         err = -EINVAL;
1032                         break;
1033                 }
1034 
1035                 /* check for special events */
1036                 if (event.type == SNDRV_SEQ_EVENT_NONE)
1037                         goto __skip_event;
1038                 else if (snd_seq_ev_is_reserved(&event)) {
1039                         err = -EINVAL;
1040                         break;
1041                 }
1042 
1043                 if (snd_seq_ev_is_variable(&event)) {
1044                         int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK;
1045                         if ((size_t)(extlen + len) > count) {
1046                                 /* back out, will get an error this time or next */
1047                                 err = -EINVAL;
1048                                 break;
1049                         }
1050                         /* set user space pointer */
1051                         event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
1052                         event.data.ext.ptr = (char __force *)buf
1053                                                 + sizeof(struct snd_seq_event);
1054                         len += extlen; /* increment data length */
1055                 } else {
1056 #ifdef CONFIG_COMPAT
1057                         if (client->convert32 && snd_seq_ev_is_varusr(&event)) {
1058                                 void *ptr = (void __force *)compat_ptr(event.data.raw32.d[1]);
1059                                 event.data.ext.ptr = ptr;
1060                         }
1061 #endif
1062                 }
1063 
1064                 /* ok, enqueue it */
1065                 err = snd_seq_client_enqueue_event(client, &event, file,
1066                                                    !(file->f_flags & O_NONBLOCK),
1067                                                    0, 0);
1068                 if (err < 0)
1069                         break;
1070 
1071         __skip_event:
1072                 /* Update pointers and counts */
1073                 count -= len;
1074                 buf += len;
1075                 written += len;
1076         }
1077 
1078         return written ? written : err;
1079 }
1080 
1081 
1082 /*
1083  * handle polling
1084  */
1085 static unsigned int snd_seq_poll(struct file *file, poll_table * wait)
1086 {
1087         struct snd_seq_client *client = file->private_data;
1088         unsigned int mask = 0;
1089 
1090         /* check client structures are in place */
1091         if (snd_BUG_ON(!client))
1092                 return -ENXIO;
1093 
1094         if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1095             client->data.user.fifo) {
1096 
1097                 /* check if data is available in the outqueue */
1098                 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
1099                         mask |= POLLIN | POLLRDNORM;
1100         }
1101 
1102         if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1103 
1104                 /* check if data is available in the pool */
1105                 if (!snd_seq_write_pool_allocated(client) ||
1106                     snd_seq_pool_poll_wait(client->pool, file, wait))
1107                         mask |= POLLOUT | POLLWRNORM;
1108         }
1109 
1110         return mask;
1111 }
1112 
1113 
1114 /*-----------------------------------------------------*/
1115 
1116 static int snd_seq_ioctl_pversion(struct snd_seq_client *client, void *arg)
1117 {
1118         int *pversion = arg;
1119 
1120         *pversion = SNDRV_SEQ_VERSION;
1121         return 0;
1122 }
1123 
1124 static int snd_seq_ioctl_client_id(struct snd_seq_client *client, void *arg)
1125 {
1126         int *client_id = arg;
1127 
1128         *client_id = client->number;
1129         return 0;
1130 }
1131 
1132 /* SYSTEM_INFO ioctl() */
1133 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void *arg)
1134 {
1135         struct snd_seq_system_info *info = arg;
1136 
1137         memset(info, 0, sizeof(*info));
1138         /* fill the info fields */
1139         info->queues = SNDRV_SEQ_MAX_QUEUES;
1140         info->clients = SNDRV_SEQ_MAX_CLIENTS;
1141         info->ports = SNDRV_SEQ_MAX_PORTS;
1142         info->channels = 256;   /* fixed limit */
1143         info->cur_clients = client_usage.cur;
1144         info->cur_queues = snd_seq_queue_get_cur_queues();
1145 
1146         return 0;
1147 }
1148 
1149 
1150 /* RUNNING_MODE ioctl() */
1151 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void  *arg)
1152 {
1153         struct snd_seq_running_info *info = arg;
1154         struct snd_seq_client *cptr;
1155         int err = 0;
1156 
1157         /* requested client number */
1158         cptr = snd_seq_client_use_ptr(info->client);
1159         if (cptr == NULL)
1160                 return -ENOENT;         /* don't change !!! */
1161 
1162 #ifdef SNDRV_BIG_ENDIAN
1163         if (!info->big_endian) {
1164                 err = -EINVAL;
1165                 goto __err;
1166         }
1167 #else
1168         if (info->big_endian) {
1169                 err = -EINVAL;
1170                 goto __err;
1171         }
1172 
1173 #endif
1174         if (info->cpu_mode > sizeof(long)) {
1175                 err = -EINVAL;
1176                 goto __err;
1177         }
1178         cptr->convert32 = (info->cpu_mode < sizeof(long));
1179  __err:
1180         snd_seq_client_unlock(cptr);
1181         return err;
1182 }
1183 
1184 /* CLIENT_INFO ioctl() */
1185 static void get_client_info(struct snd_seq_client *cptr,
1186                             struct snd_seq_client_info *info)
1187 {
1188         info->client = cptr->number;
1189 
1190         /* fill the info fields */
1191         info->type = cptr->type;
1192         strcpy(info->name, cptr->name);
1193         info->filter = cptr->filter;
1194         info->event_lost = cptr->event_lost;
1195         memcpy(info->event_filter, cptr->event_filter, 32);
1196         info->num_ports = cptr->num_ports;
1197 
1198         if (cptr->type == USER_CLIENT)
1199                 info->pid = pid_vnr(cptr->data.user.owner);
1200         else
1201                 info->pid = -1;
1202 
1203         if (cptr->type == KERNEL_CLIENT)
1204                 info->card = cptr->data.kernel.card ? cptr->data.kernel.card->number : -1;
1205         else
1206                 info->card = -1;
1207 
1208         memset(info->reserved, 0, sizeof(info->reserved));
1209 }
1210 
1211 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
1212                                          void *arg)
1213 {
1214         struct snd_seq_client_info *client_info = arg;
1215         struct snd_seq_client *cptr;
1216 
1217         /* requested client number */
1218         cptr = snd_seq_client_use_ptr(client_info->client);
1219         if (cptr == NULL)
1220                 return -ENOENT;         /* don't change !!! */
1221 
1222         get_client_info(cptr, client_info);
1223         snd_seq_client_unlock(cptr);
1224 
1225         return 0;
1226 }
1227 
1228 
1229 /* CLIENT_INFO ioctl() */
1230 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
1231                                          void *arg)
1232 {
1233         struct snd_seq_client_info *client_info = arg;
1234 
1235         /* it is not allowed to set the info fields for an another client */
1236         if (client->number != client_info->client)
1237                 return -EPERM;
1238         /* also client type must be set now */
1239         if (client->type != client_info->type)
1240                 return -EINVAL;
1241 
1242         /* fill the info fields */
1243         if (client_info->name[0])
1244                 strlcpy(client->name, client_info->name, sizeof(client->name));
1245 
1246         client->filter = client_info->filter;
1247         client->event_lost = client_info->event_lost;
1248         memcpy(client->event_filter, client_info->event_filter, 32);
1249 
1250         return 0;
1251 }
1252 
1253 
1254 /* 
1255  * CREATE PORT ioctl() 
1256  */
1257 static int snd_seq_ioctl_create_port(struct snd_seq_client *client, void *arg)
1258 {
1259         struct snd_seq_port_info *info = arg;
1260         struct snd_seq_client_port *port;
1261         struct snd_seq_port_callback *callback;
1262 
1263         /* it is not allowed to create the port for an another client */
1264         if (info->addr.client != client->number)
1265                 return -EPERM;
1266 
1267         port = snd_seq_create_port(client, (info->flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info->addr.port : -1);
1268         if (port == NULL)
1269                 return -ENOMEM;
1270 
1271         if (client->type == USER_CLIENT && info->kernel) {
1272                 snd_seq_delete_port(client, port->addr.port);
1273                 return -EINVAL;
1274         }
1275         if (client->type == KERNEL_CLIENT) {
1276                 if ((callback = info->kernel) != NULL) {
1277                         if (callback->owner)
1278                                 port->owner = callback->owner;
1279                         port->private_data = callback->private_data;
1280                         port->private_free = callback->private_free;
1281                         port->event_input = callback->event_input;
1282                         port->c_src.open = callback->subscribe;
1283                         port->c_src.close = callback->unsubscribe;
1284                         port->c_dest.open = callback->use;
1285                         port->c_dest.close = callback->unuse;
1286                 }
1287         }
1288 
1289         info->addr = port->addr;
1290 
1291         snd_seq_set_port_info(port, info);
1292         snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1293 
1294         return 0;
1295 }
1296 
1297 /* 
1298  * DELETE PORT ioctl() 
1299  */
1300 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client, void *arg)
1301 {
1302         struct snd_seq_port_info *info = arg;
1303         int err;
1304 
1305         /* it is not allowed to remove the port for an another client */
1306         if (info->addr.client != client->number)
1307                 return -EPERM;
1308 
1309         err = snd_seq_delete_port(client, info->addr.port);
1310         if (err >= 0)
1311                 snd_seq_system_client_ev_port_exit(client->number, info->addr.port);
1312         return err;
1313 }
1314 
1315 
1316 /* 
1317  * GET_PORT_INFO ioctl() (on any client) 
1318  */
1319 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client, void *arg)
1320 {
1321         struct snd_seq_port_info *info = arg;
1322         struct snd_seq_client *cptr;
1323         struct snd_seq_client_port *port;
1324 
1325         cptr = snd_seq_client_use_ptr(info->addr.client);
1326         if (cptr == NULL)
1327                 return -ENXIO;
1328 
1329         port = snd_seq_port_use_ptr(cptr, info->addr.port);
1330         if (port == NULL) {
1331                 snd_seq_client_unlock(cptr);
1332                 return -ENOENT;                 /* don't change */
1333         }
1334 
1335         /* get port info */
1336         snd_seq_get_port_info(port, info);
1337         snd_seq_port_unlock(port);
1338         snd_seq_client_unlock(cptr);
1339 
1340         return 0;
1341 }
1342 
1343 
1344 /* 
1345  * SET_PORT_INFO ioctl() (only ports on this/own client) 
1346  */
1347 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client, void *arg)
1348 {
1349         struct snd_seq_port_info *info = arg;
1350         struct snd_seq_client_port *port;
1351 
1352         if (info->addr.client != client->number) /* only set our own ports ! */
1353                 return -EPERM;
1354         port = snd_seq_port_use_ptr(client, info->addr.port);
1355         if (port) {
1356                 snd_seq_set_port_info(port, info);
1357                 snd_seq_port_unlock(port);
1358         }
1359         return 0;
1360 }
1361 
1362 
1363 /*
1364  * port subscription (connection)
1365  */
1366 #define PERM_RD         (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1367 #define PERM_WR         (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1368 
1369 static int check_subscription_permission(struct snd_seq_client *client,
1370                                          struct snd_seq_client_port *sport,
1371                                          struct snd_seq_client_port *dport,
1372                                          struct snd_seq_port_subscribe *subs)
1373 {
1374         if (client->number != subs->sender.client &&
1375             client->number != subs->dest.client) {
1376                 /* connection by third client - check export permission */
1377                 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1378                         return -EPERM;
1379                 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1380                         return -EPERM;
1381         }
1382 
1383         /* check read permission */
1384         /* if sender or receiver is the subscribing client itself,
1385          * no permission check is necessary
1386          */
1387         if (client->number != subs->sender.client) {
1388                 if (! check_port_perm(sport, PERM_RD))
1389                         return -EPERM;
1390         }
1391         /* check write permission */
1392         if (client->number != subs->dest.client) {
1393                 if (! check_port_perm(dport, PERM_WR))
1394                         return -EPERM;
1395         }
1396         return 0;
1397 }
1398 
1399 /*
1400  * send an subscription notify event to user client:
1401  * client must be user client.
1402  */
1403 int snd_seq_client_notify_subscription(int client, int port,
1404                                        struct snd_seq_port_subscribe *info,
1405                                        int evtype)
1406 {
1407         struct snd_seq_event event;
1408 
1409         memset(&event, 0, sizeof(event));
1410         event.type = evtype;
1411         event.data.connect.dest = info->dest;
1412         event.data.connect.sender = info->sender;
1413 
1414         return snd_seq_system_notify(client, port, &event);  /* non-atomic */
1415 }
1416 
1417 
1418 /* 
1419  * add to port's subscription list IOCTL interface 
1420  */
1421 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
1422                                         void *arg)
1423 {
1424         struct snd_seq_port_subscribe *subs = arg;
1425         int result = -EINVAL;
1426         struct snd_seq_client *receiver = NULL, *sender = NULL;
1427         struct snd_seq_client_port *sport = NULL, *dport = NULL;
1428 
1429         if ((receiver = snd_seq_client_use_ptr(subs->dest.client)) == NULL)
1430                 goto __end;
1431         if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1432                 goto __end;
1433         if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1434                 goto __end;
1435         if ((dport = snd_seq_port_use_ptr(receiver, subs->dest.port)) == NULL)
1436                 goto __end;
1437 
1438         result = check_subscription_permission(client, sport, dport, subs);
1439         if (result < 0)
1440                 goto __end;
1441 
1442         /* connect them */
1443         result = snd_seq_port_connect(client, sender, sport, receiver, dport, subs);
1444         if (! result) /* broadcast announce */
1445                 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1446                                                    subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1447       __end:
1448         if (sport)
1449                 snd_seq_port_unlock(sport);
1450         if (dport)
1451                 snd_seq_port_unlock(dport);
1452         if (sender)
1453                 snd_seq_client_unlock(sender);
1454         if (receiver)
1455                 snd_seq_client_unlock(receiver);
1456         return result;
1457 }
1458 
1459 
1460 /* 
1461  * remove from port's subscription list 
1462  */
1463 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
1464                                           void *arg)
1465 {
1466         struct snd_seq_port_subscribe *subs = arg;
1467         int result = -ENXIO;
1468         struct snd_seq_client *receiver = NULL, *sender = NULL;
1469         struct snd_seq_client_port *sport = NULL, *dport = NULL;
1470 
1471         if ((receiver = snd_seq_client_use_ptr(subs->dest.client)) == NULL)
1472                 goto __end;
1473         if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1474                 goto __end;
1475         if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1476                 goto __end;
1477         if ((dport = snd_seq_port_use_ptr(receiver, subs->dest.port)) == NULL)
1478                 goto __end;
1479 
1480         result = check_subscription_permission(client, sport, dport, subs);
1481         if (result < 0)
1482                 goto __end;
1483 
1484         result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, subs);
1485         if (! result) /* broadcast announce */
1486                 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1487                                                    subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1488       __end:
1489         if (sport)
1490                 snd_seq_port_unlock(sport);
1491         if (dport)
1492                 snd_seq_port_unlock(dport);
1493         if (sender)
1494                 snd_seq_client_unlock(sender);
1495         if (receiver)
1496                 snd_seq_client_unlock(receiver);
1497         return result;
1498 }
1499 
1500 
1501 /* CREATE_QUEUE ioctl() */
1502 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client, void *arg)
1503 {
1504         struct snd_seq_queue_info *info = arg;
1505         int result;
1506         struct snd_seq_queue *q;
1507 
1508         result = snd_seq_queue_alloc(client->number, info->locked, info->flags);
1509         if (result < 0)
1510                 return result;
1511 
1512         q = queueptr(result);
1513         if (q == NULL)
1514                 return -EINVAL;
1515 
1516         info->queue = q->queue;
1517         info->locked = q->locked;
1518         info->owner = q->owner;
1519 
1520         /* set queue name */
1521         if (!info->name[0])
1522                 snprintf(info->name, sizeof(info->name), "Queue-%d", q->queue);
1523         strlcpy(q->name, info->name, sizeof(q->name));
1524         queuefree(q);
1525 
1526         return 0;
1527 }
1528 
1529 /* DELETE_QUEUE ioctl() */
1530 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client, void *arg)
1531 {
1532         struct snd_seq_queue_info *info = arg;
1533 
1534         return snd_seq_queue_delete(client->number, info->queue);
1535 }
1536 
1537 /* GET_QUEUE_INFO ioctl() */
1538 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client,
1539                                         void *arg)
1540 {
1541         struct snd_seq_queue_info *info = arg;
1542         struct snd_seq_queue *q;
1543 
1544         q = queueptr(info->queue);
1545         if (q == NULL)
1546                 return -EINVAL;
1547 
1548         memset(info, 0, sizeof(*info));
1549         info->queue = q->queue;
1550         info->owner = q->owner;
1551         info->locked = q->locked;
1552         strlcpy(info->name, q->name, sizeof(info->name));
1553         queuefree(q);
1554 
1555         return 0;
1556 }
1557 
1558 /* SET_QUEUE_INFO ioctl() */
1559 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
1560                                         void *arg)
1561 {
1562         struct snd_seq_queue_info *info = arg;
1563         struct snd_seq_queue *q;
1564 
1565         if (info->owner != client->number)
1566                 return -EINVAL;
1567 
1568         /* change owner/locked permission */
1569         if (snd_seq_queue_check_access(info->queue, client->number)) {
1570                 if (snd_seq_queue_set_owner(info->queue, client->number, info->locked) < 0)
1571                         return -EPERM;
1572                 if (info->locked)
1573                         snd_seq_queue_use(info->queue, client->number, 1);
1574         } else {
1575                 return -EPERM;
1576         }       
1577 
1578         q = queueptr(info->queue);
1579         if (! q)
1580                 return -EINVAL;
1581         if (q->owner != client->number) {
1582                 queuefree(q);
1583                 return -EPERM;
1584         }
1585         strlcpy(q->name, info->name, sizeof(q->name));
1586         queuefree(q);
1587 
1588         return 0;
1589 }
1590 
1591 /* GET_NAMED_QUEUE ioctl() */
1592 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client,
1593                                          void *arg)
1594 {
1595         struct snd_seq_queue_info *info = arg;
1596         struct snd_seq_queue *q;
1597 
1598         q = snd_seq_queue_find_name(info->name);
1599         if (q == NULL)
1600                 return -EINVAL;
1601         info->queue = q->queue;
1602         info->owner = q->owner;
1603         info->locked = q->locked;
1604         queuefree(q);
1605 
1606         return 0;
1607 }
1608 
1609 /* GET_QUEUE_STATUS ioctl() */
1610 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
1611                                           void *arg)
1612 {
1613         struct snd_seq_queue_status *status = arg;
1614         struct snd_seq_queue *queue;
1615         struct snd_seq_timer *tmr;
1616 
1617         queue = queueptr(status->queue);
1618         if (queue == NULL)
1619                 return -EINVAL;
1620         memset(status, 0, sizeof(*status));
1621         status->queue = queue->queue;
1622         
1623         tmr = queue->timer;
1624         status->events = queue->tickq->cells + queue->timeq->cells;
1625 
1626         status->time = snd_seq_timer_get_cur_time(tmr);
1627         status->tick = snd_seq_timer_get_cur_tick(tmr);
1628 
1629         status->running = tmr->running;
1630 
1631         status->flags = queue->flags;
1632         queuefree(queue);
1633 
1634         return 0;
1635 }
1636 
1637 
1638 /* GET_QUEUE_TEMPO ioctl() */
1639 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
1640                                          void *arg)
1641 {
1642         struct snd_seq_queue_tempo *tempo = arg;
1643         struct snd_seq_queue *queue;
1644         struct snd_seq_timer *tmr;
1645 
1646         queue = queueptr(tempo->queue);
1647         if (queue == NULL)
1648                 return -EINVAL;
1649         memset(tempo, 0, sizeof(*tempo));
1650         tempo->queue = queue->queue;
1651         
1652         tmr = queue->timer;
1653 
1654         tempo->tempo = tmr->tempo;
1655         tempo->ppq = tmr->ppq;
1656         tempo->skew_value = tmr->skew;
1657         tempo->skew_base = tmr->skew_base;
1658         queuefree(queue);
1659 
1660         return 0;
1661 }
1662 
1663 
1664 /* SET_QUEUE_TEMPO ioctl() */
1665 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1666 {
1667         if (!snd_seq_queue_check_access(tempo->queue, client))
1668                 return -EPERM;
1669         return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1670 }
1671 
1672 EXPORT_SYMBOL(snd_seq_set_queue_tempo);
1673 
1674 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
1675                                          void *arg)
1676 {
1677         struct snd_seq_queue_tempo *tempo = arg;
1678         int result;
1679 
1680         result = snd_seq_set_queue_tempo(client->number, tempo);
1681         return result < 0 ? result : 0;
1682 }
1683 
1684 
1685 /* GET_QUEUE_TIMER ioctl() */
1686 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
1687                                          void *arg)
1688 {
1689         struct snd_seq_queue_timer *timer = arg;
1690         struct snd_seq_queue *queue;
1691         struct snd_seq_timer *tmr;
1692 
1693         queue = queueptr(timer->queue);
1694         if (queue == NULL)
1695                 return -EINVAL;
1696 
1697         if (mutex_lock_interruptible(&queue->timer_mutex)) {
1698                 queuefree(queue);
1699                 return -ERESTARTSYS;
1700         }
1701         tmr = queue->timer;
1702         memset(timer, 0, sizeof(*timer));
1703         timer->queue = queue->queue;
1704 
1705         timer->type = tmr->type;
1706         if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1707                 timer->u.alsa.id = tmr->alsa_id;
1708                 timer->u.alsa.resolution = tmr->preferred_resolution;
1709         }
1710         mutex_unlock(&queue->timer_mutex);
1711         queuefree(queue);
1712         
1713         return 0;
1714 }
1715 
1716 
1717 /* SET_QUEUE_TIMER ioctl() */
1718 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
1719                                          void *arg)
1720 {
1721         struct snd_seq_queue_timer *timer = arg;
1722         int result = 0;
1723 
1724         if (timer->type != SNDRV_SEQ_TIMER_ALSA)
1725                 return -EINVAL;
1726 
1727         if (snd_seq_queue_check_access(timer->queue, client->number)) {
1728                 struct snd_seq_queue *q;
1729                 struct snd_seq_timer *tmr;
1730 
1731                 q = queueptr(timer->queue);
1732                 if (q == NULL)
1733                         return -ENXIO;
1734                 if (mutex_lock_interruptible(&q->timer_mutex)) {
1735                         queuefree(q);
1736                         return -ERESTARTSYS;
1737                 }
1738                 tmr = q->timer;
1739                 snd_seq_queue_timer_close(timer->queue);
1740                 tmr->type = timer->type;
1741                 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1742                         tmr->alsa_id = timer->u.alsa.id;
1743                         tmr->preferred_resolution = timer->u.alsa.resolution;
1744                 }
1745                 result = snd_seq_queue_timer_open(timer->queue);
1746                 mutex_unlock(&q->timer_mutex);
1747                 queuefree(q);
1748         } else {
1749                 return -EPERM;
1750         }       
1751 
1752         return result;
1753 }
1754 
1755 
1756 /* GET_QUEUE_CLIENT ioctl() */
1757 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
1758                                           void *arg)
1759 {
1760         struct snd_seq_queue_client *info = arg;
1761         int used;
1762 
1763         used = snd_seq_queue_is_used(info->queue, client->number);
1764         if (used < 0)
1765                 return -EINVAL;
1766         info->used = used;
1767         info->client = client->number;
1768 
1769         return 0;
1770 }
1771 
1772 
1773 /* SET_QUEUE_CLIENT ioctl() */
1774 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
1775                                           void *arg)
1776 {
1777         struct snd_seq_queue_client *info = arg;
1778         int err;
1779 
1780         if (info->used >= 0) {
1781                 err = snd_seq_queue_use(info->queue, client->number, info->used);
1782                 if (err < 0)
1783                         return err;
1784         }
1785 
1786         return snd_seq_ioctl_get_queue_client(client, arg);
1787 }
1788 
1789 
1790 /* GET_CLIENT_POOL ioctl() */
1791 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
1792                                          void *arg)
1793 {
1794         struct snd_seq_client_pool *info = arg;
1795         struct snd_seq_client *cptr;
1796 
1797         cptr = snd_seq_client_use_ptr(info->client);
1798         if (cptr == NULL)
1799                 return -ENOENT;
1800         memset(info, 0, sizeof(*info));
1801         info->client = cptr->number;
1802         info->output_pool = cptr->pool->size;
1803         info->output_room = cptr->pool->room;
1804         info->output_free = info->output_pool;
1805         info->output_free = snd_seq_unused_cells(cptr->pool);
1806         if (cptr->type == USER_CLIENT) {
1807                 info->input_pool = cptr->data.user.fifo_pool_size;
1808                 info->input_free = info->input_pool;
1809                 if (cptr->data.user.fifo)
1810                         info->input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool);
1811         } else {
1812                 info->input_pool = 0;
1813                 info->input_free = 0;
1814         }
1815         snd_seq_client_unlock(cptr);
1816         
1817         return 0;
1818 }
1819 
1820 /* SET_CLIENT_POOL ioctl() */
1821 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
1822                                          void *arg)
1823 {
1824         struct snd_seq_client_pool *info = arg;
1825         int rc;
1826 
1827         if (client->number != info->client)
1828                 return -EINVAL; /* can't change other clients */
1829 
1830         if (info->output_pool >= 1 && info->output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1831             (! snd_seq_write_pool_allocated(client) ||
1832              info->output_pool != client->pool->size)) {
1833                 if (snd_seq_write_pool_allocated(client)) {
1834                         /* remove all existing cells */
1835                         snd_seq_pool_mark_closing(client->pool);
1836                         snd_seq_queue_client_leave_cells(client->number);
1837                         snd_seq_pool_done(client->pool);
1838                 }
1839                 client->pool->size = info->output_pool;
1840                 rc = snd_seq_pool_init(client->pool);
1841                 if (rc < 0)
1842                         return rc;
1843         }
1844         if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
1845             info->input_pool >= 1 &&
1846             info->input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1847             info->input_pool != client->data.user.fifo_pool_size) {
1848                 /* change pool size */
1849                 rc = snd_seq_fifo_resize(client->data.user.fifo, info->input_pool);
1850                 if (rc < 0)
1851                         return rc;
1852                 client->data.user.fifo_pool_size = info->input_pool;
1853         }
1854         if (info->output_room >= 1 &&
1855             info->output_room <= client->pool->size) {
1856                 client->pool->room  = info->output_room;
1857         }
1858 
1859         return snd_seq_ioctl_get_client_pool(client, arg);
1860 }
1861 
1862 
1863 /* REMOVE_EVENTS ioctl() */
1864 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
1865                                        void *arg)
1866 {
1867         struct snd_seq_remove_events *info = arg;
1868 
1869         /*
1870          * Input mostly not implemented XXX.
1871          */
1872         if (info->remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1873                 /*
1874                  * No restrictions so for a user client we can clear
1875                  * the whole fifo
1876                  */
1877                 if (client->type == USER_CLIENT && client->data.user.fifo)
1878                         snd_seq_fifo_clear(client->data.user.fifo);
1879         }
1880 
1881         if (info->remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1882                 snd_seq_queue_remove_cells(client->number, info);
1883 
1884         return 0;
1885 }
1886 
1887 
1888 /*
1889  * get subscription info
1890  */
1891 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
1892                                           void *arg)
1893 {
1894         struct snd_seq_port_subscribe *subs = arg;
1895         int result;
1896         struct snd_seq_client *sender = NULL;
1897         struct snd_seq_client_port *sport = NULL;
1898         struct snd_seq_subscribers *p;
1899 
1900         result = -EINVAL;
1901         if ((sender = snd_seq_client_use_ptr(subs->sender.client)) == NULL)
1902                 goto __end;
1903         if ((sport = snd_seq_port_use_ptr(sender, subs->sender.port)) == NULL)
1904                 goto __end;
1905         p = snd_seq_port_get_subscription(&sport->c_src, &subs->dest);
1906         if (p) {
1907                 result = 0;
1908                 *subs = p->info;
1909         } else
1910                 result = -ENOENT;
1911 
1912       __end:
1913         if (sport)
1914                 snd_seq_port_unlock(sport);
1915         if (sender)
1916                 snd_seq_client_unlock(sender);
1917 
1918         return result;
1919 }
1920 
1921 
1922 /*
1923  * get subscription info - check only its presence
1924  */
1925 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client, void *arg)
1926 {
1927         struct snd_seq_query_subs *subs = arg;
1928         int result = -ENXIO;
1929         struct snd_seq_client *cptr = NULL;
1930         struct snd_seq_client_port *port = NULL;
1931         struct snd_seq_port_subs_info *group;
1932         struct list_head *p;
1933         int i;
1934 
1935         if ((cptr = snd_seq_client_use_ptr(subs->root.client)) == NULL)
1936                 goto __end;
1937         if ((port = snd_seq_port_use_ptr(cptr, subs->root.port)) == NULL)
1938                 goto __end;
1939 
1940         switch (subs->type) {
1941         case SNDRV_SEQ_QUERY_SUBS_READ:
1942                 group = &port->c_src;
1943                 break;
1944         case SNDRV_SEQ_QUERY_SUBS_WRITE:
1945                 group = &port->c_dest;
1946                 break;
1947         default:
1948                 goto __end;
1949         }
1950 
1951         down_read(&group->list_mutex);
1952         /* search for the subscriber */
1953         subs->num_subs = group->count;
1954         i = 0;
1955         result = -ENOENT;
1956         list_for_each(p, &group->list_head) {
1957                 if (i++ == subs->index) {
1958                         /* found! */
1959                         struct snd_seq_subscribers *s;
1960                         if (subs->type == SNDRV_SEQ_QUERY_SUBS_READ) {
1961                                 s = list_entry(p, struct snd_seq_subscribers, src_list);
1962                                 subs->addr = s->info.dest;
1963                         } else {
1964                                 s = list_entry(p, struct snd_seq_subscribers, dest_list);
1965                                 subs->addr = s->info.sender;
1966                         }
1967                         subs->flags = s->info.flags;
1968                         subs->queue = s->info.queue;
1969                         result = 0;
1970                         break;
1971                 }
1972         }
1973         up_read(&group->list_mutex);
1974 
1975       __end:
1976         if (port)
1977                 snd_seq_port_unlock(port);
1978         if (cptr)
1979                 snd_seq_client_unlock(cptr);
1980 
1981         return result;
1982 }
1983 
1984 
1985 /*
1986  * query next client
1987  */
1988 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
1989                                            void *arg)
1990 {
1991         struct snd_seq_client_info *info = arg;
1992         struct snd_seq_client *cptr = NULL;
1993 
1994         /* search for next client */
1995         info->client++;
1996         if (info->client < 0)
1997                 info->client = 0;
1998         for (; info->client < SNDRV_SEQ_MAX_CLIENTS; info->client++) {
1999                 cptr = snd_seq_client_use_ptr(info->client);
2000                 if (cptr)
2001                         break; /* found */
2002         }
2003         if (cptr == NULL)
2004                 return -ENOENT;
2005 
2006         get_client_info(cptr, info);
2007         snd_seq_client_unlock(cptr);
2008 
2009         return 0;
2010 }
2011 
2012 /* 
2013  * query next port
2014  */
2015 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
2016                                          void *arg)
2017 {
2018         struct snd_seq_port_info *info = arg;
2019         struct snd_seq_client *cptr;
2020         struct snd_seq_client_port *port = NULL;
2021 
2022         cptr = snd_seq_client_use_ptr(info->addr.client);
2023         if (cptr == NULL)
2024                 return -ENXIO;
2025 
2026         /* search for next port */
2027         info->addr.port++;
2028         port = snd_seq_port_query_nearest(cptr, info);
2029         if (port == NULL) {
2030                 snd_seq_client_unlock(cptr);
2031                 return -ENOENT;
2032         }
2033 
2034         /* get port info */
2035         info->addr = port->addr;
2036         snd_seq_get_port_info(port, info);
2037         snd_seq_port_unlock(port);
2038         snd_seq_client_unlock(cptr);
2039 
2040         return 0;
2041 }
2042 
2043 /* -------------------------------------------------------- */
2044 
2045 static const struct ioctl_handler {
2046         unsigned int cmd;
2047         int (*func)(struct snd_seq_client *client, void *arg);
2048 } ioctl_handlers[] = {
2049         { SNDRV_SEQ_IOCTL_PVERSION, snd_seq_ioctl_pversion },
2050         { SNDRV_SEQ_IOCTL_CLIENT_ID, snd_seq_ioctl_client_id },
2051         { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2052         { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2053         { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2054         { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2055         { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2056         { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2057         { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2058         { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2059         { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2060         { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2061         { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2062         { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2063         { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2064         { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2065         { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2066         { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2067         { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2068         { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2069         { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2070         { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2071         { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2072         { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2073         { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2074         { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2075         { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2076         { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2077         { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2078         { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2079         { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2080         { 0, NULL },
2081 };
2082 
2083 static long snd_seq_ioctl(struct file *file, unsigned int cmd,
2084                           unsigned long arg)
2085 {
2086         struct snd_seq_client *client = file->private_data;
2087         /* To use kernel stack for ioctl data. */
2088         union {
2089                 int pversion;
2090                 int client_id;
2091                 struct snd_seq_system_info      system_info;
2092                 struct snd_seq_running_info     running_info;
2093                 struct snd_seq_client_info      client_info;
2094                 struct snd_seq_port_info        port_info;
2095                 struct snd_seq_port_subscribe   port_subscribe;
2096                 struct snd_seq_queue_info       queue_info;
2097                 struct snd_seq_queue_status     queue_status;
2098                 struct snd_seq_queue_tempo      tempo;
2099                 struct snd_seq_queue_timer      queue_timer;
2100                 struct snd_seq_queue_client     queue_client;
2101                 struct snd_seq_client_pool      client_pool;
2102                 struct snd_seq_remove_events    remove_events;
2103                 struct snd_seq_query_subs       query_subs;
2104         } buf;
2105         const struct ioctl_handler *handler;
2106         unsigned long size;
2107         int err;
2108 
2109         if (snd_BUG_ON(!client))
2110                 return -ENXIO;
2111 
2112         for (handler = ioctl_handlers; handler->cmd > 0; ++handler) {
2113                 if (handler->cmd == cmd)
2114                         break;
2115         }
2116         if (handler->cmd == 0)
2117                 return -ENOTTY;
2118 
2119         memset(&buf, 0, sizeof(buf));
2120 
2121         /*
2122          * All of ioctl commands for ALSA sequencer get an argument of size
2123          * within 13 bits. We can safely pick up the size from the command.
2124          */
2125         size = _IOC_SIZE(handler->cmd);
2126         if (handler->cmd & IOC_IN) {
2127                 if (copy_from_user(&buf, (const void __user *)arg, size))
2128                         return -EFAULT;
2129         }
2130 
2131         err = handler->func(client, &buf);
2132         if (err >= 0) {
2133                 /* Some commands includes a bug in 'dir' field. */
2134                 if (handler->cmd == SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT ||
2135                     handler->cmd == SNDRV_SEQ_IOCTL_SET_CLIENT_POOL ||
2136                     (handler->cmd & IOC_OUT))
2137                         if (copy_to_user((void __user *)arg, &buf, size))
2138                                 return -EFAULT;
2139         }
2140 
2141         return err;
2142 }
2143 
2144 #ifdef CONFIG_COMPAT
2145 #include "seq_compat.c"
2146 #else
2147 #define snd_seq_ioctl_compat    NULL
2148 #endif
2149 
2150 /* -------------------------------------------------------- */
2151 
2152 
2153 /* exported to kernel modules */
2154 int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
2155                                  const char *name_fmt, ...)
2156 {
2157         struct snd_seq_client *client;
2158         va_list args;
2159 
2160         if (snd_BUG_ON(in_interrupt()))
2161                 return -EBUSY;
2162 
2163         if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD)
2164                 return -EINVAL;
2165         if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
2166                 return -EINVAL;
2167 
2168         if (mutex_lock_interruptible(&register_mutex))
2169                 return -ERESTARTSYS;
2170 
2171         if (card) {
2172                 client_index += SNDRV_SEQ_GLOBAL_CLIENTS
2173                         + card->number * SNDRV_SEQ_CLIENTS_PER_CARD;
2174                 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN)
2175                         client_index = -1;
2176         }
2177 
2178         /* empty write queue as default */
2179         client = seq_create_client1(client_index, 0);
2180         if (client == NULL) {
2181                 mutex_unlock(&register_mutex);
2182                 return -EBUSY;  /* failure code */
2183         }
2184         usage_alloc(&client_usage, 1);
2185 
2186         client->accept_input = 1;
2187         client->accept_output = 1;
2188         client->data.kernel.card = card;
2189                 
2190         va_start(args, name_fmt);
2191         vsnprintf(client->name, sizeof(client->name), name_fmt, args);
2192         va_end(args);
2193 
2194         client->type = KERNEL_CLIENT;
2195         mutex_unlock(&register_mutex);
2196 
2197         /* make others aware this new client */
2198         snd_seq_system_client_ev_client_start(client->number);
2199         
2200         /* return client number to caller */
2201         return client->number;
2202 }
2203 
2204 EXPORT_SYMBOL(snd_seq_create_kernel_client);
2205 
2206 /* exported to kernel modules */
2207 int snd_seq_delete_kernel_client(int client)
2208 {
2209         struct snd_seq_client *ptr;
2210 
2211         if (snd_BUG_ON(in_interrupt()))
2212                 return -EBUSY;
2213 
2214         ptr = clientptr(client);
2215         if (ptr == NULL)
2216                 return -EINVAL;
2217 
2218         seq_free_client(ptr);
2219         kfree(ptr);
2220         return 0;
2221 }
2222 
2223 EXPORT_SYMBOL(snd_seq_delete_kernel_client);
2224 
2225 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue
2226  * and snd_seq_kernel_client_enqueue_blocking
2227  */
2228 static int kernel_client_enqueue(int client, struct snd_seq_event *ev,
2229                                  struct file *file, int blocking,
2230                                  int atomic, int hop)
2231 {
2232         struct snd_seq_client *cptr;
2233         int result;
2234 
2235         if (snd_BUG_ON(!ev))
2236                 return -EINVAL;
2237 
2238         if (ev->type == SNDRV_SEQ_EVENT_NONE)
2239                 return 0; /* ignore this */
2240         if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2241                 return -EINVAL; /* quoted events can't be enqueued */
2242 
2243         /* fill in client number */
2244         ev->source.client = client;
2245 
2246         if (check_event_type_and_length(ev))
2247                 return -EINVAL;
2248 
2249         cptr = snd_seq_client_use_ptr(client);
2250         if (cptr == NULL)
2251                 return -EINVAL;
2252         
2253         if (! cptr->accept_output)
2254                 result = -EPERM;
2255         else /* send it */
2256                 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, atomic, hop);
2257 
2258         snd_seq_client_unlock(cptr);
2259         return result;
2260 }
2261 
2262 /*
2263  * exported, called by kernel clients to enqueue events (w/o blocking)
2264  *
2265  * RETURN VALUE: zero if succeed, negative if error
2266  */
2267 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev,
2268                                   int atomic, int hop)
2269 {
2270         return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop);
2271 }
2272 
2273 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
2274 
2275 /*
2276  * exported, called by kernel clients to enqueue events (with blocking)
2277  *
2278  * RETURN VALUE: zero if succeed, negative if error
2279  */
2280 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev,
2281                                            struct file *file,
2282                                            int atomic, int hop)
2283 {
2284         return kernel_client_enqueue(client, ev, file, 1, atomic, hop);
2285 }
2286 
2287 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking);
2288 
2289 /* 
2290  * exported, called by kernel clients to dispatch events directly to other
2291  * clients, bypassing the queues.  Event time-stamp will be updated.
2292  *
2293  * RETURN VALUE: negative = delivery failed,
2294  *               zero, or positive: the number of delivered events
2295  */
2296 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev,
2297                                    int atomic, int hop)
2298 {
2299         struct snd_seq_client *cptr;
2300         int result;
2301 
2302         if (snd_BUG_ON(!ev))
2303                 return -EINVAL;
2304 
2305         /* fill in client number */
2306         ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2307         ev->source.client = client;
2308 
2309         if (check_event_type_and_length(ev))
2310                 return -EINVAL;
2311 
2312         cptr = snd_seq_client_use_ptr(client);
2313         if (cptr == NULL)
2314                 return -EINVAL;
2315 
2316         if (!cptr->accept_output)
2317                 result = -EPERM;
2318         else
2319                 result = snd_seq_deliver_event(cptr, ev, atomic, hop);
2320 
2321         snd_seq_client_unlock(cptr);
2322         return result;
2323 }
2324 
2325 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch);
2326 
2327 /**
2328  * snd_seq_kernel_client_ctl - operate a command for a client with data in
2329  *                             kernel space.
2330  * @clientid:   A numerical ID for a client.
2331  * @cmd:        An ioctl(2) command for ALSA sequencer operation.
2332  * @arg:        A pointer to data in kernel space.
2333  *
2334  * Against its name, both kernel/application client can be handled by this
2335  * kernel API. A pointer of 'arg' argument should be in kernel space.
2336  *
2337  * Return: 0 at success. Negative error code at failure.
2338  */
2339 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2340 {
2341         const struct ioctl_handler *handler;
2342         struct snd_seq_client *client;
2343 
2344         client = clientptr(clientid);
2345         if (client == NULL)
2346                 return -ENXIO;
2347 
2348         for (handler = ioctl_handlers; handler->cmd > 0; ++handler) {
2349                 if (handler->cmd == cmd)
2350                         return handler->func(client, arg);
2351         }
2352 
2353         pr_debug("ALSA: seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n",
2354                  cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2355         return -ENOTTY;
2356 }
2357 
2358 EXPORT_SYMBOL(snd_seq_kernel_client_ctl);
2359 
2360 /* exported (for OSS emulator) */
2361 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2362 {
2363         struct snd_seq_client *client;
2364 
2365         client = clientptr(clientid);
2366         if (client == NULL)
2367                 return -ENXIO;
2368 
2369         if (! snd_seq_write_pool_allocated(client))
2370                 return 1;
2371         if (snd_seq_pool_poll_wait(client->pool, file, wait))
2372                 return 1;
2373         return 0;
2374 }
2375 
2376 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll);
2377 
2378 /*---------------------------------------------------------------------------*/
2379 
2380 #ifdef CONFIG_SND_PROC_FS
2381 /*
2382  *  /proc interface
2383  */
2384 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer,
2385                                           struct snd_seq_port_subs_info *group,
2386                                           int is_src, char *msg)
2387 {
2388         struct list_head *p;
2389         struct snd_seq_subscribers *s;
2390         int count = 0;
2391 
2392         down_read(&group->list_mutex);
2393         if (list_empty(&group->list_head)) {
2394                 up_read(&group->list_mutex);
2395                 return;
2396         }
2397         snd_iprintf(buffer, msg);
2398         list_for_each(p, &group->list_head) {
2399                 if (is_src)
2400                         s = list_entry(p, struct snd_seq_subscribers, src_list);
2401                 else
2402                         s = list_entry(p, struct snd_seq_subscribers, dest_list);
2403                 if (count++)
2404                         snd_iprintf(buffer, ", ");
2405                 snd_iprintf(buffer, "%d:%d",
2406                             is_src ? s->info.dest.client : s->info.sender.client,
2407                             is_src ? s->info.dest.port : s->info.sender.port);
2408                 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
2409                         snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
2410                 if (group->exclusive)
2411                         snd_iprintf(buffer, "[ex]");
2412         }
2413         up_read(&group->list_mutex);
2414         snd_iprintf(buffer, "\n");
2415 }
2416 
2417 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
2418 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
2419 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
2420 
2421 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2422 
2423 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
2424                                     struct snd_seq_client *client)
2425 {
2426         struct snd_seq_client_port *p;
2427 
2428         mutex_lock(&client->ports_mutex);
2429         list_for_each_entry(p, &client->ports_list_head, list) {
2430                 snd_iprintf(buffer, "  Port %3d : \"%s\" (%c%c%c%c)\n",
2431                             p->addr.port, p->name,
2432                             FLAG_PERM_RD(p->capability),
2433                             FLAG_PERM_WR(p->capability),
2434                             FLAG_PERM_EX(p->capability),
2435                             FLAG_PERM_DUPLEX(p->capability));
2436                 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, "    Connecting To: ");
2437                 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, "    Connected From: ");
2438         }
2439         mutex_unlock(&client->ports_mutex);
2440 }
2441 
2442 
2443 /* exported to seq_info.c */
2444 void snd_seq_info_clients_read(struct snd_info_entry *entry, 
2445                                struct snd_info_buffer *buffer)
2446 {
2447         int c;
2448         struct snd_seq_client *client;
2449 
2450         snd_iprintf(buffer, "Client info\n");
2451         snd_iprintf(buffer, "  cur  clients : %d\n", client_usage.cur);
2452         snd_iprintf(buffer, "  peak clients : %d\n", client_usage.peak);
2453         snd_iprintf(buffer, "  max  clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
2454         snd_iprintf(buffer, "\n");
2455 
2456         /* list the client table */
2457         for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2458                 client = snd_seq_client_use_ptr(c);
2459                 if (client == NULL)
2460                         continue;
2461                 if (client->type == NO_CLIENT) {
2462                         snd_seq_client_unlock(client);
2463                         continue;
2464                 }
2465 
2466                 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n",
2467                             c, client->name,
2468                             client->type == USER_CLIENT ? "User" : "Kernel");
2469                 snd_seq_info_dump_ports(buffer, client);
2470                 if (snd_seq_write_pool_allocated(client)) {
2471                         snd_iprintf(buffer, "  Output pool :\n");
2472                         snd_seq_info_pool(buffer, client->pool, "    ");
2473                 }
2474                 if (client->type == USER_CLIENT && client->data.user.fifo &&
2475                     client->data.user.fifo->pool) {
2476                         snd_iprintf(buffer, "  Input pool :\n");
2477                         snd_seq_info_pool(buffer, client->data.user.fifo->pool, "    ");
2478                 }
2479                 snd_seq_client_unlock(client);
2480         }
2481 }
2482 #endif /* CONFIG_SND_PROC_FS */
2483 
2484 /*---------------------------------------------------------------------------*/
2485 
2486 
2487 /*
2488  *  REGISTRATION PART
2489  */
2490 
2491 static const struct file_operations snd_seq_f_ops =
2492 {
2493         .owner =        THIS_MODULE,
2494         .read =         snd_seq_read,
2495         .write =        snd_seq_write,
2496         .open =         snd_seq_open,
2497         .release =      snd_seq_release,
2498         .llseek =       no_llseek,
2499         .poll =         snd_seq_poll,
2500         .unlocked_ioctl =       snd_seq_ioctl,
2501         .compat_ioctl = snd_seq_ioctl_compat,
2502 };
2503 
2504 static struct device seq_dev;
2505 
2506 /* 
2507  * register sequencer device 
2508  */
2509 int __init snd_sequencer_device_init(void)
2510 {
2511         int err;
2512 
2513         snd_device_initialize(&seq_dev, NULL);
2514         dev_set_name(&seq_dev, "seq");
2515 
2516         if (mutex_lock_interruptible(&register_mutex))
2517                 return -ERESTARTSYS;
2518 
2519         err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
2520                                   &snd_seq_f_ops, NULL, &seq_dev);
2521         if (err < 0) {
2522                 mutex_unlock(&register_mutex);
2523                 put_device(&seq_dev);
2524                 return err;
2525         }
2526         
2527         mutex_unlock(&register_mutex);
2528 
2529         return 0;
2530 }
2531 
2532 
2533 
2534 /* 
2535  * unregister sequencer device 
2536  */
2537 void __exit snd_sequencer_device_done(void)
2538 {
2539         snd_unregister_device(&seq_dev);
2540         put_device(&seq_dev);
2541 }
2542 

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