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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/slab.h>
 26 #include <sound/core.h>
 27 #include <sound/minors.h>
 28 #include <linux/kmod.h>
 29 
 30 #include <sound/seq_kernel.h>
 31 #include "seq_clientmgr.h"
 32 #include "seq_memory.h"
 33 #include "seq_queue.h"
 34 #include "seq_timer.h"
 35 #include "seq_info.h"
 36 #include "seq_system.h"
 37 #include <sound/seq_device.h>
 38 #ifdef CONFIG_COMPAT
 39 #include <linux/compat.h>
 40 #endif
 41 
 42 /* Client Manager
 43 
 44  * this module handles the connections of userland and kernel clients
 45  * 
 46  */
 47 
 48 /*
 49  * There are four ranges of client numbers (last two shared):
 50  * 0..15: global clients
 51  * 16..127: statically allocated client numbers for cards 0..27
 52  * 128..191: dynamically allocated client numbers for cards 28..31
 53  * 128..191: dynamically allocated client numbers for applications
 54  */
 55 
 56 /* number of kernel non-card clients */
 57 #define SNDRV_SEQ_GLOBAL_CLIENTS        16
 58 /* clients per cards, for static clients */
 59 #define SNDRV_SEQ_CLIENTS_PER_CARD      4
 60 /* dynamically allocated client numbers (both kernel drivers and user space) */
 61 #define SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN 128
 62 
 63 #define SNDRV_SEQ_LFLG_INPUT    0x0001
 64 #define SNDRV_SEQ_LFLG_OUTPUT   0x0002
 65 #define SNDRV_SEQ_LFLG_OPEN     (SNDRV_SEQ_LFLG_INPUT|SNDRV_SEQ_LFLG_OUTPUT)
 66 
 67 static DEFINE_SPINLOCK(clients_lock);
 68 static DEFINE_MUTEX(register_mutex);
 69 
 70 /*
 71  * client table
 72  */
 73 static char clienttablock[SNDRV_SEQ_MAX_CLIENTS];
 74 static struct snd_seq_client *clienttab[SNDRV_SEQ_MAX_CLIENTS];
 75 static struct snd_seq_usage client_usage;
 76 
 77 /*
 78  * prototypes
 79  */
 80 static int bounce_error_event(struct snd_seq_client *client,
 81                               struct snd_seq_event *event,
 82                               int err, int atomic, int hop);
 83 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
 84                                         struct snd_seq_event *event,
 85                                         int filter, int atomic, int hop);
 86 
 87 /*
 88  */
 89  
 90 static inline mm_segment_t snd_enter_user(void)
 91 {
 92         mm_segment_t fs = get_fs();
 93         set_fs(get_ds());
 94         return fs;
 95 }
 96 
 97 static inline void snd_leave_user(mm_segment_t fs)
 98 {
 99         set_fs(fs);
100 }
101 
102 /*
103  */
104 static inline unsigned short snd_seq_file_flags(struct file *file)
105 {
106         switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
107         case FMODE_WRITE:
108                 return SNDRV_SEQ_LFLG_OUTPUT;
109         case FMODE_READ:
110                 return SNDRV_SEQ_LFLG_INPUT;
111         default:
112                 return SNDRV_SEQ_LFLG_OPEN;
113         }
114 }
115 
116 static inline int snd_seq_write_pool_allocated(struct snd_seq_client *client)
117 {
118         return snd_seq_total_cells(client->pool) > 0;
119 }
120 
121 /* return pointer to client structure for specified id */
122 static struct snd_seq_client *clientptr(int clientid)
123 {
124         if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
125                 snd_printd("Seq: oops. Trying to get pointer to client %d\n",
126                            clientid);
127                 return NULL;
128         }
129         return clienttab[clientid];
130 }
131 
132 struct snd_seq_client *snd_seq_client_use_ptr(int clientid)
133 {
134         unsigned long flags;
135         struct snd_seq_client *client;
136 
137         if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
138                 snd_printd("Seq: oops. Trying to get pointer to client %d\n",
139                            clientid);
140                 return NULL;
141         }
142         spin_lock_irqsave(&clients_lock, flags);
143         client = clientptr(clientid);
144         if (client)
145                 goto __lock;
146         if (clienttablock[clientid]) {
147                 spin_unlock_irqrestore(&clients_lock, flags);
148                 return NULL;
149         }
150         spin_unlock_irqrestore(&clients_lock, flags);
151 #ifdef CONFIG_MODULES
152         if (!in_interrupt()) {
153                 static char client_requested[SNDRV_SEQ_GLOBAL_CLIENTS];
154                 static char card_requested[SNDRV_CARDS];
155                 if (clientid < SNDRV_SEQ_GLOBAL_CLIENTS) {
156                         int idx;
157                         
158                         if (!client_requested[clientid]) {
159                                 client_requested[clientid] = 1;
160                                 for (idx = 0; idx < 15; idx++) {
161                                         if (seq_client_load[idx] < 0)
162                                                 break;
163                                         if (seq_client_load[idx] == clientid) {
164                                                 request_module("snd-seq-client-%i",
165                                                                clientid);
166                                                 break;
167                                         }
168                                 }
169                         }
170                 } else if (clientid < SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) {
171                         int card = (clientid - SNDRV_SEQ_GLOBAL_CLIENTS) /
172                                 SNDRV_SEQ_CLIENTS_PER_CARD;
173                         if (card < snd_ecards_limit) {
174                                 if (! card_requested[card]) {
175                                         card_requested[card] = 1;
176                                         snd_request_card(card);
177                                 }
178                                 snd_seq_device_load_drivers();
179                         }
180                 }
181                 spin_lock_irqsave(&clients_lock, flags);
182                 client = clientptr(clientid);
183                 if (client)
184                         goto __lock;
185                 spin_unlock_irqrestore(&clients_lock, flags);
186         }
187 #endif
188         return NULL;
189 
190       __lock:
191         snd_use_lock_use(&client->use_lock);
192         spin_unlock_irqrestore(&clients_lock, flags);
193         return client;
194 }
195 
196 static void usage_alloc(struct snd_seq_usage *res, int num)
197 {
198         res->cur += num;
199         if (res->cur > res->peak)
200                 res->peak = res->cur;
201 }
202 
203 static void usage_free(struct snd_seq_usage *res, int num)
204 {
205         res->cur -= num;
206 }
207 
208 /* initialise data structures */
209 int __init client_init_data(void)
210 {
211         /* zap out the client table */
212         memset(&clienttablock, 0, sizeof(clienttablock));
213         memset(&clienttab, 0, sizeof(clienttab));
214         return 0;
215 }
216 
217 
218 static struct snd_seq_client *seq_create_client1(int client_index, int poolsize)
219 {
220         unsigned long flags;
221         int c;
222         struct snd_seq_client *client;
223 
224         /* init client data */
225         client = kzalloc(sizeof(*client), GFP_KERNEL);
226         if (client == NULL)
227                 return NULL;
228         client->pool = snd_seq_pool_new(poolsize);
229         if (client->pool == NULL) {
230                 kfree(client);
231                 return NULL;
232         }
233         client->type = NO_CLIENT;
234         snd_use_lock_init(&client->use_lock);
235         rwlock_init(&client->ports_lock);
236         mutex_init(&client->ports_mutex);
237         INIT_LIST_HEAD(&client->ports_list_head);
238 
239         /* find free slot in the client table */
240         spin_lock_irqsave(&clients_lock, flags);
241         if (client_index < 0) {
242                 for (c = SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN;
243                      c < SNDRV_SEQ_MAX_CLIENTS;
244                      c++) {
245                         if (clienttab[c] || clienttablock[c])
246                                 continue;
247                         clienttab[client->number = c] = client;
248                         spin_unlock_irqrestore(&clients_lock, flags);
249                         return client;
250                 }
251         } else {
252                 if (clienttab[client_index] == NULL && !clienttablock[client_index]) {
253                         clienttab[client->number = client_index] = client;
254                         spin_unlock_irqrestore(&clients_lock, flags);
255                         return client;
256                 }
257         }
258         spin_unlock_irqrestore(&clients_lock, flags);
259         snd_seq_pool_delete(&client->pool);
260         kfree(client);
261         return NULL;    /* no free slot found or busy, return failure code */
262 }
263 
264 
265 static int seq_free_client1(struct snd_seq_client *client)
266 {
267         unsigned long flags;
268 
269         if (!client)
270                 return 0;
271         snd_seq_delete_all_ports(client);
272         snd_seq_queue_client_leave(client->number);
273         spin_lock_irqsave(&clients_lock, flags);
274         clienttablock[client->number] = 1;
275         clienttab[client->number] = NULL;
276         spin_unlock_irqrestore(&clients_lock, flags);
277         snd_use_lock_sync(&client->use_lock);
278         snd_seq_queue_client_termination(client->number);
279         if (client->pool)
280                 snd_seq_pool_delete(&client->pool);
281         spin_lock_irqsave(&clients_lock, flags);
282         clienttablock[client->number] = 0;
283         spin_unlock_irqrestore(&clients_lock, flags);
284         return 0;
285 }
286 
287 
288 static void seq_free_client(struct snd_seq_client * client)
289 {
290         mutex_lock(&register_mutex);
291         switch (client->type) {
292         case NO_CLIENT:
293                 snd_printk(KERN_WARNING "Seq: Trying to free unused client %d\n",
294                            client->number);
295                 break;
296         case USER_CLIENT:
297         case KERNEL_CLIENT:
298                 seq_free_client1(client);
299                 usage_free(&client_usage, 1);
300                 break;
301 
302         default:
303                 snd_printk(KERN_ERR "Seq: Trying to free client %d with undefined type = %d\n",
304                            client->number, client->type);
305         }
306         mutex_unlock(&register_mutex);
307 
308         snd_seq_system_client_ev_client_exit(client->number);
309 }
310 
311 
312 
313 /* -------------------------------------------------------- */
314 
315 /* create a user client */
316 static int snd_seq_open(struct inode *inode, struct file *file)
317 {
318         int c, mode;                    /* client id */
319         struct snd_seq_client *client;
320         struct snd_seq_user_client *user;
321         int err;
322 
323         err = nonseekable_open(inode, file);
324         if (err < 0)
325                 return err;
326 
327         if (mutex_lock_interruptible(&register_mutex))
328                 return -ERESTARTSYS;
329         client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS);
330         if (client == NULL) {
331                 mutex_unlock(&register_mutex);
332                 return -ENOMEM; /* failure code */
333         }
334 
335         mode = snd_seq_file_flags(file);
336         if (mode & SNDRV_SEQ_LFLG_INPUT)
337                 client->accept_input = 1;
338         if (mode & SNDRV_SEQ_LFLG_OUTPUT)
339                 client->accept_output = 1;
340 
341         user = &client->data.user;
342         user->fifo = NULL;
343         user->fifo_pool_size = 0;
344 
345         if (mode & SNDRV_SEQ_LFLG_INPUT) {
346                 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS;
347                 user->fifo = snd_seq_fifo_new(user->fifo_pool_size);
348                 if (user->fifo == NULL) {
349                         seq_free_client1(client);
350                         kfree(client);
351                         mutex_unlock(&register_mutex);
352                         return -ENOMEM;
353                 }
354         }
355 
356         usage_alloc(&client_usage, 1);
357         client->type = USER_CLIENT;
358         mutex_unlock(&register_mutex);
359 
360         c = client->number;
361         file->private_data = client;
362 
363         /* fill client data */
364         user->file = file;
365         sprintf(client->name, "Client-%d", c);
366 
367         /* make others aware this new client */
368         snd_seq_system_client_ev_client_start(c);
369 
370         return 0;
371 }
372 
373 /* delete a user client */
374 static int snd_seq_release(struct inode *inode, struct file *file)
375 {
376         struct snd_seq_client *client = file->private_data;
377 
378         if (client) {
379                 seq_free_client(client);
380                 if (client->data.user.fifo)
381                         snd_seq_fifo_delete(&client->data.user.fifo);
382                 kfree(client);
383         }
384 
385         return 0;
386 }
387 
388 
389 /* handle client read() */
390 /* possible error values:
391  *      -ENXIO  invalid client or file open mode
392  *      -ENOSPC FIFO overflow (the flag is cleared after this error report)
393  *      -EINVAL no enough user-space buffer to write the whole event
394  *      -EFAULT seg. fault during copy to user space
395  */
396 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count,
397                             loff_t *offset)
398 {
399         struct snd_seq_client *client = file->private_data;
400         struct snd_seq_fifo *fifo;
401         int err;
402         long result = 0;
403         struct snd_seq_event_cell *cell;
404 
405         if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT))
406                 return -ENXIO;
407 
408         if (!access_ok(VERIFY_WRITE, buf, count))
409                 return -EFAULT;
410 
411         /* check client structures are in place */
412         if (snd_BUG_ON(!client))
413                 return -ENXIO;
414 
415         if (!client->accept_input || (fifo = client->data.user.fifo) == NULL)
416                 return -ENXIO;
417 
418         if (atomic_read(&fifo->overflow) > 0) {
419                 /* buffer overflow is detected */
420                 snd_seq_fifo_clear(fifo);
421                 /* return error code */
422                 return -ENOSPC;
423         }
424 
425         cell = NULL;
426         err = 0;
427         snd_seq_fifo_lock(fifo);
428 
429         /* while data available in queue */
430         while (count >= sizeof(struct snd_seq_event)) {
431                 int nonblock;
432 
433                 nonblock = (file->f_flags & O_NONBLOCK) || result > 0;
434                 if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) {
435                         break;
436                 }
437                 if (snd_seq_ev_is_variable(&cell->event)) {
438                         struct snd_seq_event tmpev;
439                         tmpev = cell->event;
440                         tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
441                         if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) {
442                                 err = -EFAULT;
443                                 break;
444                         }
445                         count -= sizeof(struct snd_seq_event);
446                         buf += sizeof(struct snd_seq_event);
447                         err = snd_seq_expand_var_event(&cell->event, count,
448                                                        (char __force *)buf, 0,
449                                                        sizeof(struct snd_seq_event));
450                         if (err < 0)
451                                 break;
452                         result += err;
453                         count -= err;
454                         buf += err;
455                 } else {
456                         if (copy_to_user(buf, &cell->event, sizeof(struct snd_seq_event))) {
457                                 err = -EFAULT;
458                                 break;
459                         }
460                         count -= sizeof(struct snd_seq_event);
461                         buf += sizeof(struct snd_seq_event);
462                 }
463                 snd_seq_cell_free(cell);
464                 cell = NULL; /* to be sure */
465                 result += sizeof(struct snd_seq_event);
466         }
467 
468         if (err < 0) {
469                 if (cell)
470                         snd_seq_fifo_cell_putback(fifo, cell);
471                 if (err == -EAGAIN && result > 0)
472                         err = 0;
473         }
474         snd_seq_fifo_unlock(fifo);
475 
476         return (err < 0) ? err : result;
477 }
478 
479 
480 /*
481  * check access permission to the port
482  */
483 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags)
484 {
485         if ((port->capability & flags) != flags)
486                 return 0;
487         return flags;
488 }
489 
490 /*
491  * check if the destination client is available, and return the pointer
492  * if filter is non-zero, client filter bitmap is tested.
493  */
494 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event,
495                                                     int filter)
496 {
497         struct snd_seq_client *dest;
498 
499         dest = snd_seq_client_use_ptr(event->dest.client);
500         if (dest == NULL)
501                 return NULL;
502         if (! dest->accept_input)
503                 goto __not_avail;
504         if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) &&
505             ! test_bit(event->type, dest->event_filter))
506                 goto __not_avail;
507         if (filter && !(dest->filter & filter))
508                 goto __not_avail;
509 
510         return dest; /* ok - accessible */
511 __not_avail:
512         snd_seq_client_unlock(dest);
513         return NULL;
514 }
515 
516 
517 /*
518  * Return the error event.
519  *
520  * If the receiver client is a user client, the original event is
521  * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event.  If
522  * the original event is also variable length, the external data is
523  * copied after the event record. 
524  * If the receiver client is a kernel client, the original event is
525  * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra
526  * kmalloc.
527  */
528 static int bounce_error_event(struct snd_seq_client *client,
529                               struct snd_seq_event *event,
530                               int err, int atomic, int hop)
531 {
532         struct snd_seq_event bounce_ev;
533         int result;
534 
535         if (client == NULL ||
536             ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) ||
537             ! client->accept_input)
538                 return 0; /* ignored */
539 
540         /* set up quoted error */
541         memset(&bounce_ev, 0, sizeof(bounce_ev));
542         bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR;
543         bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED;
544         bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT;
545         bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
546         bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
547         bounce_ev.dest.client = client->number;
548         bounce_ev.dest.port = event->source.port;
549         bounce_ev.data.quote.origin = event->dest;
550         bounce_ev.data.quote.event = event;
551         bounce_ev.data.quote.value = -err; /* use positive value */
552         result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1);
553         if (result < 0) {
554                 client->event_lost++;
555                 return result;
556         }
557 
558         return result;
559 }
560 
561 
562 /*
563  * rewrite the time-stamp of the event record with the curren time
564  * of the given queue.
565  * return non-zero if updated.
566  */
567 static int update_timestamp_of_queue(struct snd_seq_event *event,
568                                      int queue, int real_time)
569 {
570         struct snd_seq_queue *q;
571 
572         q = queueptr(queue);
573         if (! q)
574                 return 0;
575         event->queue = queue;
576         event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK;
577         if (real_time) {
578                 event->time.time = snd_seq_timer_get_cur_time(q->timer);
579                 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL;
580         } else {
581                 event->time.tick = snd_seq_timer_get_cur_tick(q->timer);
582                 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK;
583         }
584         queuefree(q);
585         return 1;
586 }
587 
588 
589 /*
590  * deliver an event to the specified destination.
591  * if filter is non-zero, client filter bitmap is tested.
592  *
593  *  RETURN VALUE: 0 : if succeeded
594  *               <0 : error
595  */
596 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
597                                         struct snd_seq_event *event,
598                                         int filter, int atomic, int hop)
599 {
600         struct snd_seq_client *dest = NULL;
601         struct snd_seq_client_port *dest_port = NULL;
602         int result = -ENOENT;
603         int direct;
604 
605         direct = snd_seq_ev_is_direct(event);
606 
607         dest = get_event_dest_client(event, filter);
608         if (dest == NULL)
609                 goto __skip;
610         dest_port = snd_seq_port_use_ptr(dest, event->dest.port);
611         if (dest_port == NULL)
612                 goto __skip;
613 
614         /* check permission */
615         if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) {
616                 result = -EPERM;
617                 goto __skip;
618         }
619                 
620         if (dest_port->timestamping)
621                 update_timestamp_of_queue(event, dest_port->time_queue,
622                                           dest_port->time_real);
623 
624         switch (dest->type) {
625         case USER_CLIENT:
626                 if (dest->data.user.fifo)
627                         result = snd_seq_fifo_event_in(dest->data.user.fifo, event);
628                 break;
629 
630         case KERNEL_CLIENT:
631                 if (dest_port->event_input == NULL)
632                         break;
633                 result = dest_port->event_input(event, direct,
634                                                 dest_port->private_data,
635                                                 atomic, hop);
636                 break;
637         default:
638                 break;
639         }
640 
641   __skip:
642         if (dest_port)
643                 snd_seq_port_unlock(dest_port);
644         if (dest)
645                 snd_seq_client_unlock(dest);
646 
647         if (result < 0 && !direct) {
648                 result = bounce_error_event(client, event, result, atomic, hop);
649         }
650         return result;
651 }
652 
653 
654 /*
655  * send the event to all subscribers:
656  */
657 static int deliver_to_subscribers(struct snd_seq_client *client,
658                                   struct snd_seq_event *event,
659                                   int atomic, int hop)
660 {
661         struct snd_seq_subscribers *subs;
662         int err = 0, num_ev = 0;
663         struct snd_seq_event event_saved;
664         struct snd_seq_client_port *src_port;
665         struct snd_seq_port_subs_info *grp;
666 
667         src_port = snd_seq_port_use_ptr(client, event->source.port);
668         if (src_port == NULL)
669                 return -EINVAL; /* invalid source port */
670         /* save original event record */
671         event_saved = *event;
672         grp = &src_port->c_src;
673         
674         /* lock list */
675         if (atomic)
676                 read_lock(&grp->list_lock);
677         else
678                 down_read(&grp->list_mutex);
679         list_for_each_entry(subs, &grp->list_head, src_list) {
680                 event->dest = subs->info.dest;
681                 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
682                         /* convert time according to flag with subscription */
683                         update_timestamp_of_queue(event, subs->info.queue,
684                                                   subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL);
685                 err = snd_seq_deliver_single_event(client, event,
686                                                    0, atomic, hop);
687                 if (err < 0)
688                         break;
689                 num_ev++;
690                 /* restore original event record */
691                 *event = event_saved;
692         }
693         if (atomic)
694                 read_unlock(&grp->list_lock);
695         else
696                 up_read(&grp->list_mutex);
697         *event = event_saved; /* restore */
698         snd_seq_port_unlock(src_port);
699         return (err < 0) ? err : num_ev;
700 }
701 
702 
703 #ifdef SUPPORT_BROADCAST 
704 /*
705  * broadcast to all ports:
706  */
707 static int port_broadcast_event(struct snd_seq_client *client,
708                                 struct snd_seq_event *event,
709                                 int atomic, int hop)
710 {
711         int num_ev = 0, err = 0;
712         struct snd_seq_client *dest_client;
713         struct snd_seq_client_port *port;
714 
715         dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST);
716         if (dest_client == NULL)
717                 return 0; /* no matching destination */
718 
719         read_lock(&dest_client->ports_lock);
720         list_for_each_entry(port, &dest_client->ports_list_head, list) {
721                 event->dest.port = port->addr.port;
722                 /* pass NULL as source client to avoid error bounce */
723                 err = snd_seq_deliver_single_event(NULL, event,
724                                                    SNDRV_SEQ_FILTER_BROADCAST,
725                                                    atomic, hop);
726                 if (err < 0)
727                         break;
728                 num_ev++;
729         }
730         read_unlock(&dest_client->ports_lock);
731         snd_seq_client_unlock(dest_client);
732         event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */
733         return (err < 0) ? err : num_ev;
734 }
735 
736 /*
737  * send the event to all clients:
738  * if destination port is also ADDRESS_BROADCAST, deliver to all ports.
739  */
740 static int broadcast_event(struct snd_seq_client *client,
741                            struct snd_seq_event *event, int atomic, int hop)
742 {
743         int err = 0, num_ev = 0;
744         int dest;
745         struct snd_seq_addr addr;
746 
747         addr = event->dest; /* save */
748 
749         for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) {
750                 /* don't send to itself */
751                 if (dest == client->number)
752                         continue;
753                 event->dest.client = dest;
754                 event->dest.port = addr.port;
755                 if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST)
756                         err = port_broadcast_event(client, event, atomic, hop);
757                 else
758                         /* pass NULL as source client to avoid error bounce */
759                         err = snd_seq_deliver_single_event(NULL, event,
760                                                            SNDRV_SEQ_FILTER_BROADCAST,
761                                                            atomic, hop);
762                 if (err < 0)
763                         break;
764                 num_ev += err;
765         }
766         event->dest = addr; /* restore */
767         return (err < 0) ? err : num_ev;
768 }
769 
770 
771 /* multicast - not supported yet */
772 static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event,
773                            int atomic, int hop)
774 {
775         snd_printd("seq: multicast not supported yet.\n");
776         return 0; /* ignored */
777 }
778 #endif /* SUPPORT_BROADCAST */
779 
780 
781 /* deliver an event to the destination port(s).
782  * if the event is to subscribers or broadcast, the event is dispatched
783  * to multiple targets.
784  *
785  * RETURN VALUE: n > 0  : the number of delivered events.
786  *               n == 0 : the event was not passed to any client.
787  *               n < 0  : error - event was not processed.
788  */
789 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event,
790                                  int atomic, int hop)
791 {
792         int result;
793 
794         hop++;
795         if (hop >= SNDRV_SEQ_MAX_HOPS) {
796                 snd_printd("too long delivery path (%d:%d->%d:%d)\n",
797                            event->source.client, event->source.port,
798                            event->dest.client, event->dest.port);
799                 return -EMLINK;
800         }
801 
802         if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS ||
803             event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS)
804                 result = deliver_to_subscribers(client, event, atomic, hop);
805 #ifdef SUPPORT_BROADCAST
806         else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST ||
807                  event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST)
808                 result = broadcast_event(client, event, atomic, hop);
809         else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS)
810                 result = multicast_event(client, event, atomic, hop);
811         else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST)
812                 result = port_broadcast_event(client, event, atomic, hop);
813 #endif
814         else
815                 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop);
816 
817         return result;
818 }
819 
820 /*
821  * dispatch an event cell:
822  * This function is called only from queue check routines in timer
823  * interrupts or after enqueued.
824  * The event cell shall be released or re-queued in this function.
825  *
826  * RETURN VALUE: n > 0  : the number of delivered events.
827  *               n == 0 : the event was not passed to any client.
828  *               n < 0  : error - event was not processed.
829  */
830 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop)
831 {
832         struct snd_seq_client *client;
833         int result;
834 
835         if (snd_BUG_ON(!cell))
836                 return -EINVAL;
837 
838         client = snd_seq_client_use_ptr(cell->event.source.client);
839         if (client == NULL) {
840                 snd_seq_cell_free(cell); /* release this cell */
841                 return -EINVAL;
842         }
843 
844         if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) {
845                 /* NOTE event:
846                  * the event cell is re-used as a NOTE-OFF event and
847                  * enqueued again.
848                  */
849                 struct snd_seq_event tmpev, *ev;
850 
851                 /* reserve this event to enqueue note-off later */
852                 tmpev = cell->event;
853                 tmpev.type = SNDRV_SEQ_EVENT_NOTEON;
854                 result = snd_seq_deliver_event(client, &tmpev, atomic, hop);
855 
856                 /*
857                  * This was originally a note event.  We now re-use the
858                  * cell for the note-off event.
859                  */
860 
861                 ev = &cell->event;
862                 ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
863                 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH;
864 
865                 /* add the duration time */
866                 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) {
867                 case SNDRV_SEQ_TIME_STAMP_TICK:
868                         ev->time.tick += ev->data.note.duration;
869                         break;
870                 case SNDRV_SEQ_TIME_STAMP_REAL:
871                         /* unit for duration is ms */
872                         ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000);
873                         ev->time.time.tv_sec += ev->data.note.duration / 1000 +
874                                                 ev->time.time.tv_nsec / 1000000000;
875                         ev->time.time.tv_nsec %= 1000000000;
876                         break;
877                 }
878                 ev->data.note.velocity = ev->data.note.off_velocity;
879 
880                 /* Now queue this cell as the note off event */
881                 if (snd_seq_enqueue_event(cell, atomic, hop) < 0)
882                         snd_seq_cell_free(cell); /* release this cell */
883 
884         } else {
885                 /* Normal events:
886                  * event cell is freed after processing the event
887                  */
888 
889                 result = snd_seq_deliver_event(client, &cell->event, atomic, hop);
890                 snd_seq_cell_free(cell);
891         }
892 
893         snd_seq_client_unlock(client);
894         return result;
895 }
896 
897 
898 /* Allocate a cell from client pool and enqueue it to queue:
899  * if pool is empty and blocking is TRUE, sleep until a new cell is
900  * available.
901  */
902 static int snd_seq_client_enqueue_event(struct snd_seq_client *client,
903                                         struct snd_seq_event *event,
904                                         struct file *file, int blocking,
905                                         int atomic, int hop)
906 {
907         struct snd_seq_event_cell *cell;
908         int err;
909 
910         /* special queue values - force direct passing */
911         if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
912                 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
913                 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
914         } else
915 #ifdef SUPPORT_BROADCAST
916                 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) {
917                         event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST;
918                         event->queue = SNDRV_SEQ_QUEUE_DIRECT;
919                 }
920 #endif
921         if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
922                 /* check presence of source port */
923                 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port);
924                 if (src_port == NULL)
925                         return -EINVAL;
926                 snd_seq_port_unlock(src_port);
927         }
928 
929         /* direct event processing without enqueued */
930         if (snd_seq_ev_is_direct(event)) {
931                 if (event->type == SNDRV_SEQ_EVENT_NOTE)
932                         return -EINVAL; /* this event must be enqueued! */
933                 return snd_seq_deliver_event(client, event, atomic, hop);
934         }
935 
936         /* Not direct, normal queuing */
937         if (snd_seq_queue_is_used(event->queue, client->number) <= 0)
938                 return -EINVAL;  /* invalid queue */
939         if (! snd_seq_write_pool_allocated(client))
940                 return -ENXIO; /* queue is not allocated */
941 
942         /* allocate an event cell */
943         err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, file);
944         if (err < 0)
945                 return err;
946 
947         /* we got a cell. enqueue it. */
948         if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
949                 snd_seq_cell_free(cell);
950                 return err;
951         }
952 
953         return 0;
954 }
955 
956 
957 /*
958  * check validity of event type and data length.
959  * return non-zero if invalid.
960  */
961 static int check_event_type_and_length(struct snd_seq_event *ev)
962 {
963         switch (snd_seq_ev_length_type(ev)) {
964         case SNDRV_SEQ_EVENT_LENGTH_FIXED:
965                 if (snd_seq_ev_is_variable_type(ev))
966                         return -EINVAL;
967                 break;
968         case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
969                 if (! snd_seq_ev_is_variable_type(ev) ||
970                     (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
971                         return -EINVAL;
972                 break;
973         case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
974                 if (! snd_seq_ev_is_direct(ev))
975                         return -EINVAL;
976                 break;
977         }
978         return 0;
979 }
980 
981 
982 /* handle write() */
983 /* possible error values:
984  *      -ENXIO  invalid client or file open mode
985  *      -ENOMEM malloc failed
986  *      -EFAULT seg. fault during copy from user space
987  *      -EINVAL invalid event
988  *      -EAGAIN no space in output pool
989  *      -EINTR  interrupts while sleep
990  *      -EMLINK too many hops
991  *      others  depends on return value from driver callback
992  */
993 static ssize_t snd_seq_write(struct file *file, const char __user *buf,
994                              size_t count, loff_t *offset)
995 {
996         struct snd_seq_client *client = file->private_data;
997         int written = 0, len;
998         int err = -EINVAL;
999         struct snd_seq_event event;
1000 
1001         if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
1002                 return -ENXIO;
1003 
1004         /* check client structures are in place */
1005         if (snd_BUG_ON(!client))
1006                 return -ENXIO;
1007                 
1008         if (!client->accept_output || client->pool == NULL)
1009                 return -ENXIO;
1010 
1011         /* allocate the pool now if the pool is not allocated yet */ 
1012         if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
1013                 if (snd_seq_pool_init(client->pool) < 0)
1014                         return -ENOMEM;
1015         }
1016 
1017         /* only process whole events */
1018         while (count >= sizeof(struct snd_seq_event)) {
1019                 /* Read in the event header from the user */
1020                 len = sizeof(event);
1021                 if (copy_from_user(&event, buf, len)) {
1022                         err = -EFAULT;
1023                         break;
1024                 }
1025                 event.source.client = client->number;   /* fill in client number */
1026                 /* Check for extension data length */
1027                 if (check_event_type_and_length(&event)) {
1028                         err = -EINVAL;
1029                         break;
1030                 }
1031 
1032                 /* check for special events */
1033                 if (event.type == SNDRV_SEQ_EVENT_NONE)
1034                         goto __skip_event;
1035                 else if (snd_seq_ev_is_reserved(&event)) {
1036                         err = -EINVAL;
1037                         break;
1038                 }
1039 
1040                 if (snd_seq_ev_is_variable(&event)) {
1041                         int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK;
1042                         if ((size_t)(extlen + len) > count) {
1043                                 /* back out, will get an error this time or next */
1044                                 err = -EINVAL;
1045                                 break;
1046                         }
1047                         /* set user space pointer */
1048                         event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
1049                         event.data.ext.ptr = (char __force *)buf
1050                                                 + sizeof(struct snd_seq_event);
1051                         len += extlen; /* increment data length */
1052                 } else {
1053 #ifdef CONFIG_COMPAT
1054                         if (client->convert32 && snd_seq_ev_is_varusr(&event)) {
1055                                 void *ptr = (void __force *)compat_ptr(event.data.raw32.d[1]);
1056                                 event.data.ext.ptr = ptr;
1057                         }
1058 #endif
1059                 }
1060 
1061                 /* ok, enqueue it */
1062                 err = snd_seq_client_enqueue_event(client, &event, file,
1063                                                    !(file->f_flags & O_NONBLOCK),
1064                                                    0, 0);
1065                 if (err < 0)
1066                         break;
1067 
1068         __skip_event:
1069                 /* Update pointers and counts */
1070                 count -= len;
1071                 buf += len;
1072                 written += len;
1073         }
1074 
1075         return written ? written : err;
1076 }
1077 
1078 
1079 /*
1080  * handle polling
1081  */
1082 static unsigned int snd_seq_poll(struct file *file, poll_table * wait)
1083 {
1084         struct snd_seq_client *client = file->private_data;
1085         unsigned int mask = 0;
1086 
1087         /* check client structures are in place */
1088         if (snd_BUG_ON(!client))
1089                 return -ENXIO;
1090 
1091         if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1092             client->data.user.fifo) {
1093 
1094                 /* check if data is available in the outqueue */
1095                 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
1096                         mask |= POLLIN | POLLRDNORM;
1097         }
1098 
1099         if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1100 
1101                 /* check if data is available in the pool */
1102                 if (!snd_seq_write_pool_allocated(client) ||
1103                     snd_seq_pool_poll_wait(client->pool, file, wait))
1104                         mask |= POLLOUT | POLLWRNORM;
1105         }
1106 
1107         return mask;
1108 }
1109 
1110 
1111 /*-----------------------------------------------------*/
1112 
1113 
1114 /* SYSTEM_INFO ioctl() */
1115 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void __user *arg)
1116 {
1117         struct snd_seq_system_info info;
1118 
1119         memset(&info, 0, sizeof(info));
1120         /* fill the info fields */
1121         info.queues = SNDRV_SEQ_MAX_QUEUES;
1122         info.clients = SNDRV_SEQ_MAX_CLIENTS;
1123         info.ports = 256;       /* fixed limit */
1124         info.channels = 256;    /* fixed limit */
1125         info.cur_clients = client_usage.cur;
1126         info.cur_queues = snd_seq_queue_get_cur_queues();
1127 
1128         if (copy_to_user(arg, &info, sizeof(info)))
1129                 return -EFAULT;
1130         return 0;
1131 }
1132 
1133 
1134 /* RUNNING_MODE ioctl() */
1135 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void __user *arg)
1136 {
1137         struct snd_seq_running_info info;
1138         struct snd_seq_client *cptr;
1139         int err = 0;
1140 
1141         if (copy_from_user(&info, arg, sizeof(info)))
1142                 return -EFAULT;
1143 
1144         /* requested client number */
1145         cptr = snd_seq_client_use_ptr(info.client);
1146         if (cptr == NULL)
1147                 return -ENOENT;         /* don't change !!! */
1148 
1149 #ifdef SNDRV_BIG_ENDIAN
1150         if (! info.big_endian) {
1151                 err = -EINVAL;
1152                 goto __err;
1153         }
1154 #else
1155         if (info.big_endian) {
1156                 err = -EINVAL;
1157                 goto __err;
1158         }
1159 
1160 #endif
1161         if (info.cpu_mode > sizeof(long)) {
1162                 err = -EINVAL;
1163                 goto __err;
1164         }
1165         cptr->convert32 = (info.cpu_mode < sizeof(long));
1166  __err:
1167         snd_seq_client_unlock(cptr);
1168         return err;
1169 }
1170 
1171 /* CLIENT_INFO ioctl() */
1172 static void get_client_info(struct snd_seq_client *cptr,
1173                             struct snd_seq_client_info *info)
1174 {
1175         info->client = cptr->number;
1176 
1177         /* fill the info fields */
1178         info->type = cptr->type;
1179         strcpy(info->name, cptr->name);
1180         info->filter = cptr->filter;
1181         info->event_lost = cptr->event_lost;
1182         memcpy(info->event_filter, cptr->event_filter, 32);
1183         info->num_ports = cptr->num_ports;
1184         memset(info->reserved, 0, sizeof(info->reserved));
1185 }
1186 
1187 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
1188                                          void __user *arg)
1189 {
1190         struct snd_seq_client *cptr;
1191         struct snd_seq_client_info client_info;
1192 
1193         if (copy_from_user(&client_info, arg, sizeof(client_info)))
1194                 return -EFAULT;
1195 
1196         /* requested client number */
1197         cptr = snd_seq_client_use_ptr(client_info.client);
1198         if (cptr == NULL)
1199                 return -ENOENT;         /* don't change !!! */
1200 
1201         get_client_info(cptr, &client_info);
1202         snd_seq_client_unlock(cptr);
1203 
1204         if (copy_to_user(arg, &client_info, sizeof(client_info)))
1205                 return -EFAULT;
1206         return 0;
1207 }
1208 
1209 
1210 /* CLIENT_INFO ioctl() */
1211 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
1212                                          void __user *arg)
1213 {
1214         struct snd_seq_client_info client_info;
1215 
1216         if (copy_from_user(&client_info, arg, sizeof(client_info)))
1217                 return -EFAULT;
1218 
1219         /* it is not allowed to set the info fields for an another client */
1220         if (client->number != client_info.client)
1221                 return -EPERM;
1222         /* also client type must be set now */
1223         if (client->type != client_info.type)
1224                 return -EINVAL;
1225 
1226         /* fill the info fields */
1227         if (client_info.name[0])
1228                 strlcpy(client->name, client_info.name, sizeof(client->name));
1229 
1230         client->filter = client_info.filter;
1231         client->event_lost = client_info.event_lost;
1232         memcpy(client->event_filter, client_info.event_filter, 32);
1233 
1234         return 0;
1235 }
1236 
1237 
1238 /* 
1239  * CREATE PORT ioctl() 
1240  */
1241 static int snd_seq_ioctl_create_port(struct snd_seq_client *client,
1242                                      void __user *arg)
1243 {
1244         struct snd_seq_client_port *port;
1245         struct snd_seq_port_info info;
1246         struct snd_seq_port_callback *callback;
1247 
1248         if (copy_from_user(&info, arg, sizeof(info)))
1249                 return -EFAULT;
1250 
1251         /* it is not allowed to create the port for an another client */
1252         if (info.addr.client != client->number)
1253                 return -EPERM;
1254 
1255         port = snd_seq_create_port(client, (info.flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info.addr.port : -1);
1256         if (port == NULL)
1257                 return -ENOMEM;
1258 
1259         if (client->type == USER_CLIENT && info.kernel) {
1260                 snd_seq_delete_port(client, port->addr.port);
1261                 return -EINVAL;
1262         }
1263         if (client->type == KERNEL_CLIENT) {
1264                 if ((callback = info.kernel) != NULL) {
1265                         if (callback->owner)
1266                                 port->owner = callback->owner;
1267                         port->private_data = callback->private_data;
1268                         port->private_free = callback->private_free;
1269                         port->callback_all = callback->callback_all;
1270                         port->event_input = callback->event_input;
1271                         port->c_src.open = callback->subscribe;
1272                         port->c_src.close = callback->unsubscribe;
1273                         port->c_dest.open = callback->use;
1274                         port->c_dest.close = callback->unuse;
1275                 }
1276         }
1277 
1278         info.addr = port->addr;
1279 
1280         snd_seq_set_port_info(port, &info);
1281         snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1282 
1283         if (copy_to_user(arg, &info, sizeof(info)))
1284                 return -EFAULT;
1285 
1286         return 0;
1287 }
1288 
1289 /* 
1290  * DELETE PORT ioctl() 
1291  */
1292 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client,
1293                                      void __user *arg)
1294 {
1295         struct snd_seq_port_info info;
1296         int err;
1297 
1298         /* set passed parameters */
1299         if (copy_from_user(&info, arg, sizeof(info)))
1300                 return -EFAULT;
1301         
1302         /* it is not allowed to remove the port for an another client */
1303         if (info.addr.client != client->number)
1304                 return -EPERM;
1305 
1306         err = snd_seq_delete_port(client, info.addr.port);
1307         if (err >= 0)
1308                 snd_seq_system_client_ev_port_exit(client->number, info.addr.port);
1309         return err;
1310 }
1311 
1312 
1313 /* 
1314  * GET_PORT_INFO ioctl() (on any client) 
1315  */
1316 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client,
1317                                        void __user *arg)
1318 {
1319         struct snd_seq_client *cptr;
1320         struct snd_seq_client_port *port;
1321         struct snd_seq_port_info info;
1322 
1323         if (copy_from_user(&info, arg, sizeof(info)))
1324                 return -EFAULT;
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         if (copy_to_user(arg, &info, sizeof(info)))
1341                 return -EFAULT;
1342         return 0;
1343 }
1344 
1345 
1346 /* 
1347  * SET_PORT_INFO ioctl() (only ports on this/own client) 
1348  */
1349 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client,
1350                                        void __user *arg)
1351 {
1352         struct snd_seq_client_port *port;
1353         struct snd_seq_port_info info;
1354 
1355         if (copy_from_user(&info, arg, sizeof(info)))
1356                 return -EFAULT;
1357 
1358         if (info.addr.client != client->number) /* only set our own ports ! */
1359                 return -EPERM;
1360         port = snd_seq_port_use_ptr(client, info.addr.port);
1361         if (port) {
1362                 snd_seq_set_port_info(port, &info);
1363                 snd_seq_port_unlock(port);
1364         }
1365         return 0;
1366 }
1367 
1368 
1369 /*
1370  * port subscription (connection)
1371  */
1372 #define PERM_RD         (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1373 #define PERM_WR         (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1374 
1375 static int check_subscription_permission(struct snd_seq_client *client,
1376                                          struct snd_seq_client_port *sport,
1377                                          struct snd_seq_client_port *dport,
1378                                          struct snd_seq_port_subscribe *subs)
1379 {
1380         if (client->number != subs->sender.client &&
1381             client->number != subs->dest.client) {
1382                 /* connection by third client - check export permission */
1383                 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1384                         return -EPERM;
1385                 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1386                         return -EPERM;
1387         }
1388 
1389         /* check read permission */
1390         /* if sender or receiver is the subscribing client itself,
1391          * no permission check is necessary
1392          */
1393         if (client->number != subs->sender.client) {
1394                 if (! check_port_perm(sport, PERM_RD))
1395                         return -EPERM;
1396         }
1397         /* check write permission */
1398         if (client->number != subs->dest.client) {
1399                 if (! check_port_perm(dport, PERM_WR))
1400                         return -EPERM;
1401         }
1402         return 0;
1403 }
1404 
1405 /*
1406  * send an subscription notify event to user client:
1407  * client must be user client.
1408  */
1409 int snd_seq_client_notify_subscription(int client, int port,
1410                                        struct snd_seq_port_subscribe *info,
1411                                        int evtype)
1412 {
1413         struct snd_seq_event event;
1414 
1415         memset(&event, 0, sizeof(event));
1416         event.type = evtype;
1417         event.data.connect.dest = info->dest;
1418         event.data.connect.sender = info->sender;
1419 
1420         return snd_seq_system_notify(client, port, &event);  /* non-atomic */
1421 }
1422 
1423 
1424 /* 
1425  * add to port's subscription list IOCTL interface 
1426  */
1427 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
1428                                         void __user *arg)
1429 {
1430         int result = -EINVAL;
1431         struct snd_seq_client *receiver = NULL, *sender = NULL;
1432         struct snd_seq_client_port *sport = NULL, *dport = NULL;
1433         struct snd_seq_port_subscribe subs;
1434 
1435         if (copy_from_user(&subs, arg, sizeof(subs)))
1436                 return -EFAULT;
1437 
1438         if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1439                 goto __end;
1440         if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1441                 goto __end;
1442         if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1443                 goto __end;
1444         if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1445                 goto __end;
1446 
1447         result = check_subscription_permission(client, sport, dport, &subs);
1448         if (result < 0)
1449                 goto __end;
1450 
1451         /* connect them */
1452         result = snd_seq_port_connect(client, sender, sport, receiver, dport, &subs);
1453         if (! result) /* broadcast announce */
1454                 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1455                                                    &subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1456       __end:
1457         if (sport)
1458                 snd_seq_port_unlock(sport);
1459         if (dport)
1460                 snd_seq_port_unlock(dport);
1461         if (sender)
1462                 snd_seq_client_unlock(sender);
1463         if (receiver)
1464                 snd_seq_client_unlock(receiver);
1465         return result;
1466 }
1467 
1468 
1469 /* 
1470  * remove from port's subscription list 
1471  */
1472 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
1473                                           void __user *arg)
1474 {
1475         int result = -ENXIO;
1476         struct snd_seq_client *receiver = NULL, *sender = NULL;
1477         struct snd_seq_client_port *sport = NULL, *dport = NULL;
1478         struct snd_seq_port_subscribe subs;
1479 
1480         if (copy_from_user(&subs, arg, sizeof(subs)))
1481                 return -EFAULT;
1482 
1483         if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1484                 goto __end;
1485         if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1486                 goto __end;
1487         if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1488                 goto __end;
1489         if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1490                 goto __end;
1491 
1492         result = check_subscription_permission(client, sport, dport, &subs);
1493         if (result < 0)
1494                 goto __end;
1495 
1496         result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, &subs);
1497         if (! result) /* broadcast announce */
1498                 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1499                                                    &subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1500       __end:
1501         if (sport)
1502                 snd_seq_port_unlock(sport);
1503         if (dport)
1504                 snd_seq_port_unlock(dport);
1505         if (sender)
1506                 snd_seq_client_unlock(sender);
1507         if (receiver)
1508                 snd_seq_client_unlock(receiver);
1509         return result;
1510 }
1511 
1512 
1513 /* CREATE_QUEUE ioctl() */
1514 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client,
1515                                       void __user *arg)
1516 {
1517         struct snd_seq_queue_info info;
1518         int result;
1519         struct snd_seq_queue *q;
1520 
1521         if (copy_from_user(&info, arg, sizeof(info)))
1522                 return -EFAULT;
1523 
1524         result = snd_seq_queue_alloc(client->number, info.locked, info.flags);
1525         if (result < 0)
1526                 return result;
1527 
1528         q = queueptr(result);
1529         if (q == NULL)
1530                 return -EINVAL;
1531 
1532         info.queue = q->queue;
1533         info.locked = q->locked;
1534         info.owner = q->owner;
1535 
1536         /* set queue name */
1537         if (! info.name[0])
1538                 snprintf(info.name, sizeof(info.name), "Queue-%d", q->queue);
1539         strlcpy(q->name, info.name, sizeof(q->name));
1540         queuefree(q);
1541 
1542         if (copy_to_user(arg, &info, sizeof(info)))
1543                 return -EFAULT;
1544 
1545         return 0;
1546 }
1547 
1548 /* DELETE_QUEUE ioctl() */
1549 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client,
1550                                       void __user *arg)
1551 {
1552         struct snd_seq_queue_info info;
1553 
1554         if (copy_from_user(&info, arg, sizeof(info)))
1555                 return -EFAULT;
1556 
1557         return snd_seq_queue_delete(client->number, info.queue);
1558 }
1559 
1560 /* GET_QUEUE_INFO ioctl() */
1561 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client,
1562                                         void __user *arg)
1563 {
1564         struct snd_seq_queue_info info;
1565         struct snd_seq_queue *q;
1566 
1567         if (copy_from_user(&info, arg, sizeof(info)))
1568                 return -EFAULT;
1569 
1570         q = queueptr(info.queue);
1571         if (q == NULL)
1572                 return -EINVAL;
1573 
1574         memset(&info, 0, sizeof(info));
1575         info.queue = q->queue;
1576         info.owner = q->owner;
1577         info.locked = q->locked;
1578         strlcpy(info.name, q->name, sizeof(info.name));
1579         queuefree(q);
1580 
1581         if (copy_to_user(arg, &info, sizeof(info)))
1582                 return -EFAULT;
1583 
1584         return 0;
1585 }
1586 
1587 /* SET_QUEUE_INFO ioctl() */
1588 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
1589                                         void __user *arg)
1590 {
1591         struct snd_seq_queue_info info;
1592         struct snd_seq_queue *q;
1593 
1594         if (copy_from_user(&info, arg, sizeof(info)))
1595                 return -EFAULT;
1596 
1597         if (info.owner != client->number)
1598                 return -EINVAL;
1599 
1600         /* change owner/locked permission */
1601         if (snd_seq_queue_check_access(info.queue, client->number)) {
1602                 if (snd_seq_queue_set_owner(info.queue, client->number, info.locked) < 0)
1603                         return -EPERM;
1604                 if (info.locked)
1605                         snd_seq_queue_use(info.queue, client->number, 1);
1606         } else {
1607                 return -EPERM;
1608         }       
1609 
1610         q = queueptr(info.queue);
1611         if (! q)
1612                 return -EINVAL;
1613         if (q->owner != client->number) {
1614                 queuefree(q);
1615                 return -EPERM;
1616         }
1617         strlcpy(q->name, info.name, sizeof(q->name));
1618         queuefree(q);
1619 
1620         return 0;
1621 }
1622 
1623 /* GET_NAMED_QUEUE ioctl() */
1624 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client, void __user *arg)
1625 {
1626         struct snd_seq_queue_info info;
1627         struct snd_seq_queue *q;
1628 
1629         if (copy_from_user(&info, arg, sizeof(info)))
1630                 return -EFAULT;
1631 
1632         q = snd_seq_queue_find_name(info.name);
1633         if (q == NULL)
1634                 return -EINVAL;
1635         info.queue = q->queue;
1636         info.owner = q->owner;
1637         info.locked = q->locked;
1638         queuefree(q);
1639 
1640         if (copy_to_user(arg, &info, sizeof(info)))
1641                 return -EFAULT;
1642 
1643         return 0;
1644 }
1645 
1646 /* GET_QUEUE_STATUS ioctl() */
1647 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
1648                                           void __user *arg)
1649 {
1650         struct snd_seq_queue_status status;
1651         struct snd_seq_queue *queue;
1652         struct snd_seq_timer *tmr;
1653 
1654         if (copy_from_user(&status, arg, sizeof(status)))
1655                 return -EFAULT;
1656 
1657         queue = queueptr(status.queue);
1658         if (queue == NULL)
1659                 return -EINVAL;
1660         memset(&status, 0, sizeof(status));
1661         status.queue = queue->queue;
1662         
1663         tmr = queue->timer;
1664         status.events = queue->tickq->cells + queue->timeq->cells;
1665 
1666         status.time = snd_seq_timer_get_cur_time(tmr);
1667         status.tick = snd_seq_timer_get_cur_tick(tmr);
1668 
1669         status.running = tmr->running;
1670 
1671         status.flags = queue->flags;
1672         queuefree(queue);
1673 
1674         if (copy_to_user(arg, &status, sizeof(status)))
1675                 return -EFAULT;
1676         return 0;
1677 }
1678 
1679 
1680 /* GET_QUEUE_TEMPO ioctl() */
1681 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
1682                                          void __user *arg)
1683 {
1684         struct snd_seq_queue_tempo tempo;
1685         struct snd_seq_queue *queue;
1686         struct snd_seq_timer *tmr;
1687 
1688         if (copy_from_user(&tempo, arg, sizeof(tempo)))
1689                 return -EFAULT;
1690 
1691         queue = queueptr(tempo.queue);
1692         if (queue == NULL)
1693                 return -EINVAL;
1694         memset(&tempo, 0, sizeof(tempo));
1695         tempo.queue = queue->queue;
1696         
1697         tmr = queue->timer;
1698 
1699         tempo.tempo = tmr->tempo;
1700         tempo.ppq = tmr->ppq;
1701         tempo.skew_value = tmr->skew;
1702         tempo.skew_base = tmr->skew_base;
1703         queuefree(queue);
1704 
1705         if (copy_to_user(arg, &tempo, sizeof(tempo)))
1706                 return -EFAULT;
1707         return 0;
1708 }
1709 
1710 
1711 /* SET_QUEUE_TEMPO ioctl() */
1712 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1713 {
1714         if (!snd_seq_queue_check_access(tempo->queue, client))
1715                 return -EPERM;
1716         return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1717 }
1718 
1719 EXPORT_SYMBOL(snd_seq_set_queue_tempo);
1720 
1721 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
1722                                          void __user *arg)
1723 {
1724         int result;
1725         struct snd_seq_queue_tempo tempo;
1726 
1727         if (copy_from_user(&tempo, arg, sizeof(tempo)))
1728                 return -EFAULT;
1729 
1730         result = snd_seq_set_queue_tempo(client->number, &tempo);
1731         return result < 0 ? result : 0;
1732 }
1733 
1734 
1735 /* GET_QUEUE_TIMER ioctl() */
1736 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
1737                                          void __user *arg)
1738 {
1739         struct snd_seq_queue_timer timer;
1740         struct snd_seq_queue *queue;
1741         struct snd_seq_timer *tmr;
1742 
1743         if (copy_from_user(&timer, arg, sizeof(timer)))
1744                 return -EFAULT;
1745 
1746         queue = queueptr(timer.queue);
1747         if (queue == NULL)
1748                 return -EINVAL;
1749 
1750         if (mutex_lock_interruptible(&queue->timer_mutex)) {
1751                 queuefree(queue);
1752                 return -ERESTARTSYS;
1753         }
1754         tmr = queue->timer;
1755         memset(&timer, 0, sizeof(timer));
1756         timer.queue = queue->queue;
1757 
1758         timer.type = tmr->type;
1759         if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1760                 timer.u.alsa.id = tmr->alsa_id;
1761                 timer.u.alsa.resolution = tmr->preferred_resolution;
1762         }
1763         mutex_unlock(&queue->timer_mutex);
1764         queuefree(queue);
1765         
1766         if (copy_to_user(arg, &timer, sizeof(timer)))
1767                 return -EFAULT;
1768         return 0;
1769 }
1770 
1771 
1772 /* SET_QUEUE_TIMER ioctl() */
1773 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
1774                                          void __user *arg)
1775 {
1776         int result = 0;
1777         struct snd_seq_queue_timer timer;
1778 
1779         if (copy_from_user(&timer, arg, sizeof(timer)))
1780                 return -EFAULT;
1781 
1782         if (timer.type != SNDRV_SEQ_TIMER_ALSA)
1783                 return -EINVAL;
1784 
1785         if (snd_seq_queue_check_access(timer.queue, client->number)) {
1786                 struct snd_seq_queue *q;
1787                 struct snd_seq_timer *tmr;
1788 
1789                 q = queueptr(timer.queue);
1790                 if (q == NULL)
1791                         return -ENXIO;
1792                 if (mutex_lock_interruptible(&q->timer_mutex)) {
1793                         queuefree(q);
1794                         return -ERESTARTSYS;
1795                 }
1796                 tmr = q->timer;
1797                 snd_seq_queue_timer_close(timer.queue);
1798                 tmr->type = timer.type;
1799                 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1800                         tmr->alsa_id = timer.u.alsa.id;
1801                         tmr->preferred_resolution = timer.u.alsa.resolution;
1802                 }
1803                 result = snd_seq_queue_timer_open(timer.queue);
1804                 mutex_unlock(&q->timer_mutex);
1805                 queuefree(q);
1806         } else {
1807                 return -EPERM;
1808         }       
1809 
1810         return result;
1811 }
1812 
1813 
1814 /* GET_QUEUE_CLIENT ioctl() */
1815 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
1816                                           void __user *arg)
1817 {
1818         struct snd_seq_queue_client info;
1819         int used;
1820 
1821         if (copy_from_user(&info, arg, sizeof(info)))
1822                 return -EFAULT;
1823 
1824         used = snd_seq_queue_is_used(info.queue, client->number);
1825         if (used < 0)
1826                 return -EINVAL;
1827         info.used = used;
1828         info.client = client->number;
1829 
1830         if (copy_to_user(arg, &info, sizeof(info)))
1831                 return -EFAULT;
1832         return 0;
1833 }
1834 
1835 
1836 /* SET_QUEUE_CLIENT ioctl() */
1837 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
1838                                           void __user *arg)
1839 {
1840         int err;
1841         struct snd_seq_queue_client info;
1842 
1843         if (copy_from_user(&info, arg, sizeof(info)))
1844                 return -EFAULT;
1845 
1846         if (info.used >= 0) {
1847                 err = snd_seq_queue_use(info.queue, client->number, info.used);
1848                 if (err < 0)
1849                         return err;
1850         }
1851 
1852         return snd_seq_ioctl_get_queue_client(client, arg);
1853 }
1854 
1855 
1856 /* GET_CLIENT_POOL ioctl() */
1857 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
1858                                          void __user *arg)
1859 {
1860         struct snd_seq_client_pool info;
1861         struct snd_seq_client *cptr;
1862 
1863         if (copy_from_user(&info, arg, sizeof(info)))
1864                 return -EFAULT;
1865 
1866         cptr = snd_seq_client_use_ptr(info.client);
1867         if (cptr == NULL)
1868                 return -ENOENT;
1869         memset(&info, 0, sizeof(info));
1870         info.output_pool = cptr->pool->size;
1871         info.output_room = cptr->pool->room;
1872         info.output_free = info.output_pool;
1873         info.output_free = snd_seq_unused_cells(cptr->pool);
1874         if (cptr->type == USER_CLIENT) {
1875                 info.input_pool = cptr->data.user.fifo_pool_size;
1876                 info.input_free = info.input_pool;
1877                 if (cptr->data.user.fifo)
1878                         info.input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool);
1879         } else {
1880                 info.input_pool = 0;
1881                 info.input_free = 0;
1882         }
1883         snd_seq_client_unlock(cptr);
1884         
1885         if (copy_to_user(arg, &info, sizeof(info)))
1886                 return -EFAULT;
1887         return 0;
1888 }
1889 
1890 /* SET_CLIENT_POOL ioctl() */
1891 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
1892                                          void __user *arg)
1893 {
1894         struct snd_seq_client_pool info;
1895         int rc;
1896 
1897         if (copy_from_user(&info, arg, sizeof(info)))
1898                 return -EFAULT;
1899 
1900         if (client->number != info.client)
1901                 return -EINVAL; /* can't change other clients */
1902 
1903         if (info.output_pool >= 1 && info.output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1904             (! snd_seq_write_pool_allocated(client) ||
1905              info.output_pool != client->pool->size)) {
1906                 if (snd_seq_write_pool_allocated(client)) {
1907                         /* remove all existing cells */
1908                         snd_seq_queue_client_leave_cells(client->number);
1909                         snd_seq_pool_done(client->pool);
1910                 }
1911                 client->pool->size = info.output_pool;
1912                 rc = snd_seq_pool_init(client->pool);
1913                 if (rc < 0)
1914                         return rc;
1915         }
1916         if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
1917             info.input_pool >= 1 &&
1918             info.input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1919             info.input_pool != client->data.user.fifo_pool_size) {
1920                 /* change pool size */
1921                 rc = snd_seq_fifo_resize(client->data.user.fifo, info.input_pool);
1922                 if (rc < 0)
1923                         return rc;
1924                 client->data.user.fifo_pool_size = info.input_pool;
1925         }
1926         if (info.output_room >= 1 &&
1927             info.output_room <= client->pool->size) {
1928                 client->pool->room  = info.output_room;
1929         }
1930 
1931         return snd_seq_ioctl_get_client_pool(client, arg);
1932 }
1933 
1934 
1935 /* REMOVE_EVENTS ioctl() */
1936 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
1937                                        void __user *arg)
1938 {
1939         struct snd_seq_remove_events info;
1940 
1941         if (copy_from_user(&info, arg, sizeof(info)))
1942                 return -EFAULT;
1943 
1944         /*
1945          * Input mostly not implemented XXX.
1946          */
1947         if (info.remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1948                 /*
1949                  * No restrictions so for a user client we can clear
1950                  * the whole fifo
1951                  */
1952                 if (client->type == USER_CLIENT)
1953                         snd_seq_fifo_clear(client->data.user.fifo);
1954         }
1955 
1956         if (info.remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1957                 snd_seq_queue_remove_cells(client->number, &info);
1958 
1959         return 0;
1960 }
1961 
1962 
1963 /*
1964  * get subscription info
1965  */
1966 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
1967                                           void __user *arg)
1968 {
1969         int result;
1970         struct snd_seq_client *sender = NULL;
1971         struct snd_seq_client_port *sport = NULL;
1972         struct snd_seq_port_subscribe subs;
1973         struct snd_seq_subscribers *p;
1974 
1975         if (copy_from_user(&subs, arg, sizeof(subs)))
1976                 return -EFAULT;
1977 
1978         result = -EINVAL;
1979         if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1980                 goto __end;
1981         if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1982                 goto __end;
1983         p = snd_seq_port_get_subscription(&sport->c_src, &subs.dest);
1984         if (p) {
1985                 result = 0;
1986                 subs = p->info;
1987         } else
1988                 result = -ENOENT;
1989 
1990       __end:
1991         if (sport)
1992                 snd_seq_port_unlock(sport);
1993         if (sender)
1994                 snd_seq_client_unlock(sender);
1995         if (result >= 0) {
1996                 if (copy_to_user(arg, &subs, sizeof(subs)))
1997                         return -EFAULT;
1998         }
1999         return result;
2000 }
2001 
2002 
2003 /*
2004  * get subscription info - check only its presence
2005  */
2006 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client,
2007                                     void __user *arg)
2008 {
2009         int result = -ENXIO;
2010         struct snd_seq_client *cptr = NULL;
2011         struct snd_seq_client_port *port = NULL;
2012         struct snd_seq_query_subs subs;
2013         struct snd_seq_port_subs_info *group;
2014         struct list_head *p;
2015         int i;
2016 
2017         if (copy_from_user(&subs, arg, sizeof(subs)))
2018                 return -EFAULT;
2019 
2020         if ((cptr = snd_seq_client_use_ptr(subs.root.client)) == NULL)
2021                 goto __end;
2022         if ((port = snd_seq_port_use_ptr(cptr, subs.root.port)) == NULL)
2023                 goto __end;
2024 
2025         switch (subs.type) {
2026         case SNDRV_SEQ_QUERY_SUBS_READ:
2027                 group = &port->c_src;
2028                 break;
2029         case SNDRV_SEQ_QUERY_SUBS_WRITE:
2030                 group = &port->c_dest;
2031                 break;
2032         default:
2033                 goto __end;
2034         }
2035 
2036         down_read(&group->list_mutex);
2037         /* search for the subscriber */
2038         subs.num_subs = group->count;
2039         i = 0;
2040         result = -ENOENT;
2041         list_for_each(p, &group->list_head) {
2042                 if (i++ == subs.index) {
2043                         /* found! */
2044                         struct snd_seq_subscribers *s;
2045                         if (subs.type == SNDRV_SEQ_QUERY_SUBS_READ) {
2046                                 s = list_entry(p, struct snd_seq_subscribers, src_list);
2047                                 subs.addr = s->info.dest;
2048                         } else {
2049                                 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2050                                 subs.addr = s->info.sender;
2051                         }
2052                         subs.flags = s->info.flags;
2053                         subs.queue = s->info.queue;
2054                         result = 0;
2055                         break;
2056                 }
2057         }
2058         up_read(&group->list_mutex);
2059 
2060       __end:
2061         if (port)
2062                 snd_seq_port_unlock(port);
2063         if (cptr)
2064                 snd_seq_client_unlock(cptr);
2065         if (result >= 0) {
2066                 if (copy_to_user(arg, &subs, sizeof(subs)))
2067                         return -EFAULT;
2068         }
2069         return result;
2070 }
2071 
2072 
2073 /*
2074  * query next client
2075  */
2076 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
2077                                            void __user *arg)
2078 {
2079         struct snd_seq_client *cptr = NULL;
2080         struct snd_seq_client_info info;
2081 
2082         if (copy_from_user(&info, arg, sizeof(info)))
2083                 return -EFAULT;
2084 
2085         /* search for next client */
2086         info.client++;
2087         if (info.client < 0)
2088                 info.client = 0;
2089         for (; info.client < SNDRV_SEQ_MAX_CLIENTS; info.client++) {
2090                 cptr = snd_seq_client_use_ptr(info.client);
2091                 if (cptr)
2092                         break; /* found */
2093         }
2094         if (cptr == NULL)
2095                 return -ENOENT;
2096 
2097         get_client_info(cptr, &info);
2098         snd_seq_client_unlock(cptr);
2099 
2100         if (copy_to_user(arg, &info, sizeof(info)))
2101                 return -EFAULT;
2102         return 0;
2103 }
2104 
2105 /* 
2106  * query next port
2107  */
2108 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
2109                                          void __user *arg)
2110 {
2111         struct snd_seq_client *cptr;
2112         struct snd_seq_client_port *port = NULL;
2113         struct snd_seq_port_info info;
2114 
2115         if (copy_from_user(&info, arg, sizeof(info)))
2116                 return -EFAULT;
2117         cptr = snd_seq_client_use_ptr(info.addr.client);
2118         if (cptr == NULL)
2119                 return -ENXIO;
2120 
2121         /* search for next port */
2122         info.addr.port++;
2123         port = snd_seq_port_query_nearest(cptr, &info);
2124         if (port == NULL) {
2125                 snd_seq_client_unlock(cptr);
2126                 return -ENOENT;
2127         }
2128 
2129         /* get port info */
2130         info.addr = port->addr;
2131         snd_seq_get_port_info(port, &info);
2132         snd_seq_port_unlock(port);
2133         snd_seq_client_unlock(cptr);
2134 
2135         if (copy_to_user(arg, &info, sizeof(info)))
2136                 return -EFAULT;
2137         return 0;
2138 }
2139 
2140 /* -------------------------------------------------------- */
2141 
2142 static struct seq_ioctl_table {
2143         unsigned int cmd;
2144         int (*func)(struct snd_seq_client *client, void __user * arg);
2145 } ioctl_tables[] = {
2146         { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2147         { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2148         { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2149         { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2150         { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2151         { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2152         { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2153         { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2154         { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2155         { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2156         { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2157         { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2158         { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2159         { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2160         { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2161         { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2162         { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2163         { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2164         { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2165         { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2166         { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2167         { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2168         { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2169         { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2170         { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2171         { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2172         { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2173         { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2174         { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2175         { 0, NULL },
2176 };
2177 
2178 static int snd_seq_do_ioctl(struct snd_seq_client *client, unsigned int cmd,
2179                             void __user *arg)
2180 {
2181         struct seq_ioctl_table *p;
2182 
2183         switch (cmd) {
2184         case SNDRV_SEQ_IOCTL_PVERSION:
2185                 /* return sequencer version number */
2186                 return put_user(SNDRV_SEQ_VERSION, (int __user *)arg) ? -EFAULT : 0;
2187         case SNDRV_SEQ_IOCTL_CLIENT_ID:
2188                 /* return the id of this client */
2189                 return put_user(client->number, (int __user *)arg) ? -EFAULT : 0;
2190         }
2191 
2192         if (! arg)
2193                 return -EFAULT;
2194         for (p = ioctl_tables; p->cmd; p++) {
2195                 if (p->cmd == cmd)
2196                         return p->func(client, arg);
2197         }
2198         snd_printd("seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n",
2199                    cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2200         return -ENOTTY;
2201 }
2202 
2203 
2204 static long snd_seq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2205 {
2206         struct snd_seq_client *client = file->private_data;
2207 
2208         if (snd_BUG_ON(!client))
2209                 return -ENXIO;
2210                 
2211         return snd_seq_do_ioctl(client, cmd, (void __user *) arg);
2212 }
2213 
2214 #ifdef CONFIG_COMPAT
2215 #include "seq_compat.c"
2216 #else
2217 #define snd_seq_ioctl_compat    NULL
2218 #endif
2219 
2220 /* -------------------------------------------------------- */
2221 
2222 
2223 /* exported to kernel modules */
2224 int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
2225                                  const char *name_fmt, ...)
2226 {
2227         struct snd_seq_client *client;
2228         va_list args;
2229 
2230         if (snd_BUG_ON(in_interrupt()))
2231                 return -EBUSY;
2232 
2233         if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD)
2234                 return -EINVAL;
2235         if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
2236                 return -EINVAL;
2237 
2238         if (mutex_lock_interruptible(&register_mutex))
2239                 return -ERESTARTSYS;
2240 
2241         if (card) {
2242                 client_index += SNDRV_SEQ_GLOBAL_CLIENTS
2243                         + card->number * SNDRV_SEQ_CLIENTS_PER_CARD;
2244                 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN)
2245                         client_index = -1;
2246         }
2247 
2248         /* empty write queue as default */
2249         client = seq_create_client1(client_index, 0);
2250         if (client == NULL) {
2251                 mutex_unlock(&register_mutex);
2252                 return -EBUSY;  /* failure code */
2253         }
2254         usage_alloc(&client_usage, 1);
2255 
2256         client->accept_input = 1;
2257         client->accept_output = 1;
2258                 
2259         va_start(args, name_fmt);
2260         vsnprintf(client->name, sizeof(client->name), name_fmt, args);
2261         va_end(args);
2262 
2263         client->type = KERNEL_CLIENT;
2264         mutex_unlock(&register_mutex);
2265 
2266         /* make others aware this new client */
2267         snd_seq_system_client_ev_client_start(client->number);
2268         
2269         /* return client number to caller */
2270         return client->number;
2271 }
2272 
2273 EXPORT_SYMBOL(snd_seq_create_kernel_client);
2274 
2275 /* exported to kernel modules */
2276 int snd_seq_delete_kernel_client(int client)
2277 {
2278         struct snd_seq_client *ptr;
2279 
2280         if (snd_BUG_ON(in_interrupt()))
2281                 return -EBUSY;
2282 
2283         ptr = clientptr(client);
2284         if (ptr == NULL)
2285                 return -EINVAL;
2286 
2287         seq_free_client(ptr);
2288         kfree(ptr);
2289         return 0;
2290 }
2291 
2292 EXPORT_SYMBOL(snd_seq_delete_kernel_client);
2293 
2294 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue
2295  * and snd_seq_kernel_client_enqueue_blocking
2296  */
2297 static int kernel_client_enqueue(int client, struct snd_seq_event *ev,
2298                                  struct file *file, int blocking,
2299                                  int atomic, int hop)
2300 {
2301         struct snd_seq_client *cptr;
2302         int result;
2303 
2304         if (snd_BUG_ON(!ev))
2305                 return -EINVAL;
2306 
2307         if (ev->type == SNDRV_SEQ_EVENT_NONE)
2308                 return 0; /* ignore this */
2309         if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2310                 return -EINVAL; /* quoted events can't be enqueued */
2311 
2312         /* fill in client number */
2313         ev->source.client = client;
2314 
2315         if (check_event_type_and_length(ev))
2316                 return -EINVAL;
2317 
2318         cptr = snd_seq_client_use_ptr(client);
2319         if (cptr == NULL)
2320                 return -EINVAL;
2321         
2322         if (! cptr->accept_output)
2323                 result = -EPERM;
2324         else /* send it */
2325                 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, atomic, hop);
2326 
2327         snd_seq_client_unlock(cptr);
2328         return result;
2329 }
2330 
2331 /*
2332  * exported, called by kernel clients to enqueue events (w/o blocking)
2333  *
2334  * RETURN VALUE: zero if succeed, negative if error
2335  */
2336 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev,
2337                                   int atomic, int hop)
2338 {
2339         return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop);
2340 }
2341 
2342 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
2343 
2344 /*
2345  * exported, called by kernel clients to enqueue events (with blocking)
2346  *
2347  * RETURN VALUE: zero if succeed, negative if error
2348  */
2349 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev,
2350                                            struct file *file,
2351                                            int atomic, int hop)
2352 {
2353         return kernel_client_enqueue(client, ev, file, 1, atomic, hop);
2354 }
2355 
2356 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking);
2357 
2358 /* 
2359  * exported, called by kernel clients to dispatch events directly to other
2360  * clients, bypassing the queues.  Event time-stamp will be updated.
2361  *
2362  * RETURN VALUE: negative = delivery failed,
2363  *               zero, or positive: the number of delivered events
2364  */
2365 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev,
2366                                    int atomic, int hop)
2367 {
2368         struct snd_seq_client *cptr;
2369         int result;
2370 
2371         if (snd_BUG_ON(!ev))
2372                 return -EINVAL;
2373 
2374         /* fill in client number */
2375         ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2376         ev->source.client = client;
2377 
2378         if (check_event_type_and_length(ev))
2379                 return -EINVAL;
2380 
2381         cptr = snd_seq_client_use_ptr(client);
2382         if (cptr == NULL)
2383                 return -EINVAL;
2384 
2385         if (!cptr->accept_output)
2386                 result = -EPERM;
2387         else
2388                 result = snd_seq_deliver_event(cptr, ev, atomic, hop);
2389 
2390         snd_seq_client_unlock(cptr);
2391         return result;
2392 }
2393 
2394 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch);
2395 
2396 /*
2397  * exported, called by kernel clients to perform same functions as with
2398  * userland ioctl() 
2399  */
2400 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2401 {
2402         struct snd_seq_client *client;
2403         mm_segment_t fs;
2404         int result;
2405 
2406         client = clientptr(clientid);
2407         if (client == NULL)
2408                 return -ENXIO;
2409         fs = snd_enter_user();
2410         result = snd_seq_do_ioctl(client, cmd, (void __force __user *)arg);
2411         snd_leave_user(fs);
2412         return result;
2413 }
2414 
2415 EXPORT_SYMBOL(snd_seq_kernel_client_ctl);
2416 
2417 /* exported (for OSS emulator) */
2418 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2419 {
2420         struct snd_seq_client *client;
2421 
2422         client = clientptr(clientid);
2423         if (client == NULL)
2424                 return -ENXIO;
2425 
2426         if (! snd_seq_write_pool_allocated(client))
2427                 return 1;
2428         if (snd_seq_pool_poll_wait(client->pool, file, wait))
2429                 return 1;
2430         return 0;
2431 }
2432 
2433 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll);
2434 
2435 /*---------------------------------------------------------------------------*/
2436 
2437 #ifdef CONFIG_PROC_FS
2438 /*
2439  *  /proc interface
2440  */
2441 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer,
2442                                           struct snd_seq_port_subs_info *group,
2443                                           int is_src, char *msg)
2444 {
2445         struct list_head *p;
2446         struct snd_seq_subscribers *s;
2447         int count = 0;
2448 
2449         down_read(&group->list_mutex);
2450         if (list_empty(&group->list_head)) {
2451                 up_read(&group->list_mutex);
2452                 return;
2453         }
2454         snd_iprintf(buffer, msg);
2455         list_for_each(p, &group->list_head) {
2456                 if (is_src)
2457                         s = list_entry(p, struct snd_seq_subscribers, src_list);
2458                 else
2459                         s = list_entry(p, struct snd_seq_subscribers, dest_list);
2460                 if (count++)
2461                         snd_iprintf(buffer, ", ");
2462                 snd_iprintf(buffer, "%d:%d",
2463                             is_src ? s->info.dest.client : s->info.sender.client,
2464                             is_src ? s->info.dest.port : s->info.sender.port);
2465                 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
2466                         snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
2467                 if (group->exclusive)
2468                         snd_iprintf(buffer, "[ex]");
2469         }
2470         up_read(&group->list_mutex);
2471         snd_iprintf(buffer, "\n");
2472 }
2473 
2474 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
2475 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
2476 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
2477 
2478 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2479 
2480 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
2481                                     struct snd_seq_client *client)
2482 {
2483         struct snd_seq_client_port *p;
2484 
2485         mutex_lock(&client->ports_mutex);
2486         list_for_each_entry(p, &client->ports_list_head, list) {
2487                 snd_iprintf(buffer, "  Port %3d : \"%s\" (%c%c%c%c)\n",
2488                             p->addr.port, p->name,
2489                             FLAG_PERM_RD(p->capability),
2490                             FLAG_PERM_WR(p->capability),
2491                             FLAG_PERM_EX(p->capability),
2492                             FLAG_PERM_DUPLEX(p->capability));
2493                 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, "    Connecting To: ");
2494                 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, "    Connected From: ");
2495         }
2496         mutex_unlock(&client->ports_mutex);
2497 }
2498 
2499 
2500 /* exported to seq_info.c */
2501 void snd_seq_info_clients_read(struct snd_info_entry *entry, 
2502                                struct snd_info_buffer *buffer)
2503 {
2504         int c;
2505         struct snd_seq_client *client;
2506 
2507         snd_iprintf(buffer, "Client info\n");
2508         snd_iprintf(buffer, "  cur  clients : %d\n", client_usage.cur);
2509         snd_iprintf(buffer, "  peak clients : %d\n", client_usage.peak);
2510         snd_iprintf(buffer, "  max  clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
2511         snd_iprintf(buffer, "\n");
2512 
2513         /* list the client table */
2514         for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2515                 client = snd_seq_client_use_ptr(c);
2516                 if (client == NULL)
2517                         continue;
2518                 if (client->type == NO_CLIENT) {
2519                         snd_seq_client_unlock(client);
2520                         continue;
2521                 }
2522 
2523                 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n",
2524                             c, client->name,
2525                             client->type == USER_CLIENT ? "User" : "Kernel");
2526                 snd_seq_info_dump_ports(buffer, client);
2527                 if (snd_seq_write_pool_allocated(client)) {
2528                         snd_iprintf(buffer, "  Output pool :\n");
2529                         snd_seq_info_pool(buffer, client->pool, "    ");
2530                 }
2531                 if (client->type == USER_CLIENT && client->data.user.fifo &&
2532                     client->data.user.fifo->pool) {
2533                         snd_iprintf(buffer, "  Input pool :\n");
2534                         snd_seq_info_pool(buffer, client->data.user.fifo->pool, "    ");
2535                 }
2536                 snd_seq_client_unlock(client);
2537         }
2538 }
2539 #endif /* CONFIG_PROC_FS */
2540 
2541 /*---------------------------------------------------------------------------*/
2542 
2543 
2544 /*
2545  *  REGISTRATION PART
2546  */
2547 
2548 static const struct file_operations snd_seq_f_ops =
2549 {
2550         .owner =        THIS_MODULE,
2551         .read =         snd_seq_read,
2552         .write =        snd_seq_write,
2553         .open =         snd_seq_open,
2554         .release =      snd_seq_release,
2555         .llseek =       no_llseek,
2556         .poll =         snd_seq_poll,
2557         .unlocked_ioctl =       snd_seq_ioctl,
2558         .compat_ioctl = snd_seq_ioctl_compat,
2559 };
2560 
2561 /* 
2562  * register sequencer device 
2563  */
2564 int __init snd_sequencer_device_init(void)
2565 {
2566         int err;
2567 
2568         if (mutex_lock_interruptible(&register_mutex))
2569                 return -ERESTARTSYS;
2570 
2571         if ((err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
2572                                        &snd_seq_f_ops, NULL, "seq")) < 0) {
2573                 mutex_unlock(&register_mutex);
2574                 return err;
2575         }
2576         
2577         mutex_unlock(&register_mutex);
2578 
2579         return 0;
2580 }
2581 
2582 
2583 
2584 /* 
2585  * unregister sequencer device 
2586  */
2587 void __exit snd_sequencer_device_done(void)
2588 {
2589         snd_unregister_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0);
2590 }
2591 

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