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

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  1 /*
  2  *  ALSA sequencer Client Manager
  3  *  Copyright (c) 1998-2001 by Frank van de Pol <fvdpol@coil.demon.nl>
  4  *                             Jaroslav Kysela <perex@perex.cz>
  5  *                             Takashi Iwai <tiwai@suse.de>
  6  *
  7  *
  8  *   This program is free software; you can redistribute it and/or modify
  9  *   it under the terms of the GNU General Public License as published by
 10  *   the Free Software Foundation; either version 2 of the License, or
 11  *   (at your option) any later version.
 12  *
 13  *   This program is distributed in the hope that it will be useful,
 14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 16  *   GNU General Public License for more details.
 17  *
 18  *   You should have received a copy of the GNU General Public License
 19  *   along with this program; if not, write to the Free Software
 20  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 21  *
 22  */
 23 
 24 #include <linux/init.h>
 25 #include <linux/export.h>
 26 #include <linux/slab.h>
 27 #include <sound/core.h>
 28 #include <sound/minors.h>
 29 #include <linux/kmod.h>
 30 
 31 #include <sound/seq_kernel.h>
 32 #include "seq_clientmgr.h"
 33 #include "seq_memory.h"
 34 #include "seq_queue.h"
 35 #include "seq_timer.h"
 36 #include "seq_info.h"
 37 #include "seq_system.h"
 38 #include <sound/seq_device.h>
 39 #ifdef CONFIG_COMPAT
 40 #include <linux/compat.h>
 41 #endif
 42 
 43 /* Client Manager
 44 
 45  * this module handles the connections of userland and kernel clients
 46  * 
 47  */
 48 
 49 /*
 50  * There are four ranges of client numbers (last two shared):
 51  * 0..15: global clients
 52  * 16..127: statically allocated client numbers for cards 0..27
 53  * 128..191: dynamically allocated client numbers for cards 28..31
 54  * 128..191: dynamically allocated client numbers for applications
 55  */
 56 
 57 /* number of kernel non-card clients */
 58 #define SNDRV_SEQ_GLOBAL_CLIENTS        16
 59 /* clients per cards, for static clients */
 60 #define SNDRV_SEQ_CLIENTS_PER_CARD      4
 61 /* dynamically allocated client numbers (both kernel drivers and user space) */
 62 #define SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN 128
 63 
 64 #define SNDRV_SEQ_LFLG_INPUT    0x0001
 65 #define SNDRV_SEQ_LFLG_OUTPUT   0x0002
 66 #define SNDRV_SEQ_LFLG_OPEN     (SNDRV_SEQ_LFLG_INPUT|SNDRV_SEQ_LFLG_OUTPUT)
 67 
 68 static DEFINE_SPINLOCK(clients_lock);
 69 static DEFINE_MUTEX(register_mutex);
 70 
 71 /*
 72  * client table
 73  */
 74 static char clienttablock[SNDRV_SEQ_MAX_CLIENTS];
 75 static struct snd_seq_client *clienttab[SNDRV_SEQ_MAX_CLIENTS];
 76 static struct snd_seq_usage client_usage;
 77 
 78 /*
 79  * prototypes
 80  */
 81 static int bounce_error_event(struct snd_seq_client *client,
 82                               struct snd_seq_event *event,
 83                               int err, int atomic, int hop);
 84 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
 85                                         struct snd_seq_event *event,
 86                                         int filter, int atomic, int hop);
 87 
 88 /*
 89  */
 90  
 91 static inline mm_segment_t snd_enter_user(void)
 92 {
 93         mm_segment_t fs = get_fs();
 94         set_fs(get_ds());
 95         return fs;
 96 }
 97 
 98 static inline void snd_leave_user(mm_segment_t fs)
 99 {
100         set_fs(fs);
101 }
102 
103 /*
104  */
105 static inline unsigned short snd_seq_file_flags(struct file *file)
106 {
107         switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
108         case FMODE_WRITE:
109                 return SNDRV_SEQ_LFLG_OUTPUT;
110         case FMODE_READ:
111                 return SNDRV_SEQ_LFLG_INPUT;
112         default:
113                 return SNDRV_SEQ_LFLG_OPEN;
114         }
115 }
116 
117 static inline int snd_seq_write_pool_allocated(struct snd_seq_client *client)
118 {
119         return snd_seq_total_cells(client->pool) > 0;
120 }
121 
122 /* return pointer to client structure for specified id */
123 static struct snd_seq_client *clientptr(int clientid)
124 {
125         if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
126                 snd_printd("Seq: oops. Trying to get pointer to client %d\n",
127                            clientid);
128                 return NULL;
129         }
130         return clienttab[clientid];
131 }
132 
133 struct snd_seq_client *snd_seq_client_use_ptr(int clientid)
134 {
135         unsigned long flags;
136         struct snd_seq_client *client;
137 
138         if (clientid < 0 || clientid >= SNDRV_SEQ_MAX_CLIENTS) {
139                 snd_printd("Seq: oops. Trying to get pointer to client %d\n",
140                            clientid);
141                 return NULL;
142         }
143         spin_lock_irqsave(&clients_lock, flags);
144         client = clientptr(clientid);
145         if (client)
146                 goto __lock;
147         if (clienttablock[clientid]) {
148                 spin_unlock_irqrestore(&clients_lock, flags);
149                 return NULL;
150         }
151         spin_unlock_irqrestore(&clients_lock, flags);
152 #ifdef CONFIG_MODULES
153         if (!in_interrupt()) {
154                 static char client_requested[SNDRV_SEQ_GLOBAL_CLIENTS];
155                 static char card_requested[SNDRV_CARDS];
156                 if (clientid < SNDRV_SEQ_GLOBAL_CLIENTS) {
157                         int idx;
158                         
159                         if (!client_requested[clientid]) {
160                                 client_requested[clientid] = 1;
161                                 for (idx = 0; idx < 15; idx++) {
162                                         if (seq_client_load[idx] < 0)
163                                                 break;
164                                         if (seq_client_load[idx] == clientid) {
165                                                 request_module("snd-seq-client-%i",
166                                                                clientid);
167                                                 break;
168                                         }
169                                 }
170                         }
171                 } else if (clientid < SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN) {
172                         int card = (clientid - SNDRV_SEQ_GLOBAL_CLIENTS) /
173                                 SNDRV_SEQ_CLIENTS_PER_CARD;
174                         if (card < snd_ecards_limit) {
175                                 if (! card_requested[card]) {
176                                         card_requested[card] = 1;
177                                         snd_request_card(card);
178                                 }
179                                 snd_seq_device_load_drivers();
180                         }
181                 }
182                 spin_lock_irqsave(&clients_lock, flags);
183                 client = clientptr(clientid);
184                 if (client)
185                         goto __lock;
186                 spin_unlock_irqrestore(&clients_lock, flags);
187         }
188 #endif
189         return NULL;
190 
191       __lock:
192         snd_use_lock_use(&client->use_lock);
193         spin_unlock_irqrestore(&clients_lock, flags);
194         return client;
195 }
196 
197 static void usage_alloc(struct snd_seq_usage *res, int num)
198 {
199         res->cur += num;
200         if (res->cur > res->peak)
201                 res->peak = res->cur;
202 }
203 
204 static void usage_free(struct snd_seq_usage *res, int num)
205 {
206         res->cur -= num;
207 }
208 
209 /* initialise data structures */
210 int __init client_init_data(void)
211 {
212         /* zap out the client table */
213         memset(&clienttablock, 0, sizeof(clienttablock));
214         memset(&clienttab, 0, sizeof(clienttab));
215         return 0;
216 }
217 
218 
219 static struct snd_seq_client *seq_create_client1(int client_index, int poolsize)
220 {
221         unsigned long flags;
222         int c;
223         struct snd_seq_client *client;
224 
225         /* init client data */
226         client = kzalloc(sizeof(*client), GFP_KERNEL);
227         if (client == NULL)
228                 return NULL;
229         client->pool = snd_seq_pool_new(poolsize);
230         if (client->pool == NULL) {
231                 kfree(client);
232                 return NULL;
233         }
234         client->type = NO_CLIENT;
235         snd_use_lock_init(&client->use_lock);
236         rwlock_init(&client->ports_lock);
237         mutex_init(&client->ports_mutex);
238         INIT_LIST_HEAD(&client->ports_list_head);
239 
240         /* find free slot in the client table */
241         spin_lock_irqsave(&clients_lock, flags);
242         if (client_index < 0) {
243                 for (c = SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN;
244                      c < SNDRV_SEQ_MAX_CLIENTS;
245                      c++) {
246                         if (clienttab[c] || clienttablock[c])
247                                 continue;
248                         clienttab[client->number = c] = client;
249                         spin_unlock_irqrestore(&clients_lock, flags);
250                         return client;
251                 }
252         } else {
253                 if (clienttab[client_index] == NULL && !clienttablock[client_index]) {
254                         clienttab[client->number = client_index] = client;
255                         spin_unlock_irqrestore(&clients_lock, flags);
256                         return client;
257                 }
258         }
259         spin_unlock_irqrestore(&clients_lock, flags);
260         snd_seq_pool_delete(&client->pool);
261         kfree(client);
262         return NULL;    /* no free slot found or busy, return failure code */
263 }
264 
265 
266 static int seq_free_client1(struct snd_seq_client *client)
267 {
268         unsigned long flags;
269 
270         if (!client)
271                 return 0;
272         snd_seq_delete_all_ports(client);
273         snd_seq_queue_client_leave(client->number);
274         spin_lock_irqsave(&clients_lock, flags);
275         clienttablock[client->number] = 1;
276         clienttab[client->number] = NULL;
277         spin_unlock_irqrestore(&clients_lock, flags);
278         snd_use_lock_sync(&client->use_lock);
279         snd_seq_queue_client_termination(client->number);
280         if (client->pool)
281                 snd_seq_pool_delete(&client->pool);
282         spin_lock_irqsave(&clients_lock, flags);
283         clienttablock[client->number] = 0;
284         spin_unlock_irqrestore(&clients_lock, flags);
285         return 0;
286 }
287 
288 
289 static void seq_free_client(struct snd_seq_client * client)
290 {
291         mutex_lock(&register_mutex);
292         switch (client->type) {
293         case NO_CLIENT:
294                 snd_printk(KERN_WARNING "Seq: Trying to free unused client %d\n",
295                            client->number);
296                 break;
297         case USER_CLIENT:
298         case KERNEL_CLIENT:
299                 seq_free_client1(client);
300                 usage_free(&client_usage, 1);
301                 break;
302 
303         default:
304                 snd_printk(KERN_ERR "Seq: Trying to free client %d with undefined type = %d\n",
305                            client->number, client->type);
306         }
307         mutex_unlock(&register_mutex);
308 
309         snd_seq_system_client_ev_client_exit(client->number);
310 }
311 
312 
313 
314 /* -------------------------------------------------------- */
315 
316 /* create a user client */
317 static int snd_seq_open(struct inode *inode, struct file *file)
318 {
319         int c, mode;                    /* client id */
320         struct snd_seq_client *client;
321         struct snd_seq_user_client *user;
322         int err;
323 
324         err = nonseekable_open(inode, file);
325         if (err < 0)
326                 return err;
327 
328         if (mutex_lock_interruptible(&register_mutex))
329                 return -ERESTARTSYS;
330         client = seq_create_client1(-1, SNDRV_SEQ_DEFAULT_EVENTS);
331         if (client == NULL) {
332                 mutex_unlock(&register_mutex);
333                 return -ENOMEM; /* failure code */
334         }
335 
336         mode = snd_seq_file_flags(file);
337         if (mode & SNDRV_SEQ_LFLG_INPUT)
338                 client->accept_input = 1;
339         if (mode & SNDRV_SEQ_LFLG_OUTPUT)
340                 client->accept_output = 1;
341 
342         user = &client->data.user;
343         user->fifo = NULL;
344         user->fifo_pool_size = 0;
345 
346         if (mode & SNDRV_SEQ_LFLG_INPUT) {
347                 user->fifo_pool_size = SNDRV_SEQ_DEFAULT_CLIENT_EVENTS;
348                 user->fifo = snd_seq_fifo_new(user->fifo_pool_size);
349                 if (user->fifo == NULL) {
350                         seq_free_client1(client);
351                         kfree(client);
352                         mutex_unlock(&register_mutex);
353                         return -ENOMEM;
354                 }
355         }
356 
357         usage_alloc(&client_usage, 1);
358         client->type = USER_CLIENT;
359         mutex_unlock(&register_mutex);
360 
361         c = client->number;
362         file->private_data = client;
363 
364         /* fill client data */
365         user->file = file;
366         sprintf(client->name, "Client-%d", c);
367 
368         /* make others aware this new client */
369         snd_seq_system_client_ev_client_start(c);
370 
371         return 0;
372 }
373 
374 /* delete a user client */
375 static int snd_seq_release(struct inode *inode, struct file *file)
376 {
377         struct snd_seq_client *client = file->private_data;
378 
379         if (client) {
380                 seq_free_client(client);
381                 if (client->data.user.fifo)
382                         snd_seq_fifo_delete(&client->data.user.fifo);
383                 kfree(client);
384         }
385 
386         return 0;
387 }
388 
389 
390 /* handle client read() */
391 /* possible error values:
392  *      -ENXIO  invalid client or file open mode
393  *      -ENOSPC FIFO overflow (the flag is cleared after this error report)
394  *      -EINVAL no enough user-space buffer to write the whole event
395  *      -EFAULT seg. fault during copy to user space
396  */
397 static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count,
398                             loff_t *offset)
399 {
400         struct snd_seq_client *client = file->private_data;
401         struct snd_seq_fifo *fifo;
402         int err;
403         long result = 0;
404         struct snd_seq_event_cell *cell;
405 
406         if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT))
407                 return -ENXIO;
408 
409         if (!access_ok(VERIFY_WRITE, buf, count))
410                 return -EFAULT;
411 
412         /* check client structures are in place */
413         if (snd_BUG_ON(!client))
414                 return -ENXIO;
415 
416         if (!client->accept_input || (fifo = client->data.user.fifo) == NULL)
417                 return -ENXIO;
418 
419         if (atomic_read(&fifo->overflow) > 0) {
420                 /* buffer overflow is detected */
421                 snd_seq_fifo_clear(fifo);
422                 /* return error code */
423                 return -ENOSPC;
424         }
425 
426         cell = NULL;
427         err = 0;
428         snd_seq_fifo_lock(fifo);
429 
430         /* while data available in queue */
431         while (count >= sizeof(struct snd_seq_event)) {
432                 int nonblock;
433 
434                 nonblock = (file->f_flags & O_NONBLOCK) || result > 0;
435                 if ((err = snd_seq_fifo_cell_out(fifo, &cell, nonblock)) < 0) {
436                         break;
437                 }
438                 if (snd_seq_ev_is_variable(&cell->event)) {
439                         struct snd_seq_event tmpev;
440                         tmpev = cell->event;
441                         tmpev.data.ext.len &= ~SNDRV_SEQ_EXT_MASK;
442                         if (copy_to_user(buf, &tmpev, sizeof(struct snd_seq_event))) {
443                                 err = -EFAULT;
444                                 break;
445                         }
446                         count -= sizeof(struct snd_seq_event);
447                         buf += sizeof(struct snd_seq_event);
448                         err = snd_seq_expand_var_event(&cell->event, count,
449                                                        (char __force *)buf, 0,
450                                                        sizeof(struct snd_seq_event));
451                         if (err < 0)
452                                 break;
453                         result += err;
454                         count -= err;
455                         buf += err;
456                 } else {
457                         if (copy_to_user(buf, &cell->event, sizeof(struct snd_seq_event))) {
458                                 err = -EFAULT;
459                                 break;
460                         }
461                         count -= sizeof(struct snd_seq_event);
462                         buf += sizeof(struct snd_seq_event);
463                 }
464                 snd_seq_cell_free(cell);
465                 cell = NULL; /* to be sure */
466                 result += sizeof(struct snd_seq_event);
467         }
468 
469         if (err < 0) {
470                 if (cell)
471                         snd_seq_fifo_cell_putback(fifo, cell);
472                 if (err == -EAGAIN && result > 0)
473                         err = 0;
474         }
475         snd_seq_fifo_unlock(fifo);
476 
477         return (err < 0) ? err : result;
478 }
479 
480 
481 /*
482  * check access permission to the port
483  */
484 static int check_port_perm(struct snd_seq_client_port *port, unsigned int flags)
485 {
486         if ((port->capability & flags) != flags)
487                 return 0;
488         return flags;
489 }
490 
491 /*
492  * check if the destination client is available, and return the pointer
493  * if filter is non-zero, client filter bitmap is tested.
494  */
495 static struct snd_seq_client *get_event_dest_client(struct snd_seq_event *event,
496                                                     int filter)
497 {
498         struct snd_seq_client *dest;
499 
500         dest = snd_seq_client_use_ptr(event->dest.client);
501         if (dest == NULL)
502                 return NULL;
503         if (! dest->accept_input)
504                 goto __not_avail;
505         if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) &&
506             ! test_bit(event->type, dest->event_filter))
507                 goto __not_avail;
508         if (filter && !(dest->filter & filter))
509                 goto __not_avail;
510 
511         return dest; /* ok - accessible */
512 __not_avail:
513         snd_seq_client_unlock(dest);
514         return NULL;
515 }
516 
517 
518 /*
519  * Return the error event.
520  *
521  * If the receiver client is a user client, the original event is
522  * encapsulated in SNDRV_SEQ_EVENT_BOUNCE as variable length event.  If
523  * the original event is also variable length, the external data is
524  * copied after the event record. 
525  * If the receiver client is a kernel client, the original event is
526  * quoted in SNDRV_SEQ_EVENT_KERNEL_ERROR, since this requires no extra
527  * kmalloc.
528  */
529 static int bounce_error_event(struct snd_seq_client *client,
530                               struct snd_seq_event *event,
531                               int err, int atomic, int hop)
532 {
533         struct snd_seq_event bounce_ev;
534         int result;
535 
536         if (client == NULL ||
537             ! (client->filter & SNDRV_SEQ_FILTER_BOUNCE) ||
538             ! client->accept_input)
539                 return 0; /* ignored */
540 
541         /* set up quoted error */
542         memset(&bounce_ev, 0, sizeof(bounce_ev));
543         bounce_ev.type = SNDRV_SEQ_EVENT_KERNEL_ERROR;
544         bounce_ev.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED;
545         bounce_ev.queue = SNDRV_SEQ_QUEUE_DIRECT;
546         bounce_ev.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
547         bounce_ev.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
548         bounce_ev.dest.client = client->number;
549         bounce_ev.dest.port = event->source.port;
550         bounce_ev.data.quote.origin = event->dest;
551         bounce_ev.data.quote.event = event;
552         bounce_ev.data.quote.value = -err; /* use positive value */
553         result = snd_seq_deliver_single_event(NULL, &bounce_ev, 0, atomic, hop + 1);
554         if (result < 0) {
555                 client->event_lost++;
556                 return result;
557         }
558 
559         return result;
560 }
561 
562 
563 /*
564  * rewrite the time-stamp of the event record with the curren time
565  * of the given queue.
566  * return non-zero if updated.
567  */
568 static int update_timestamp_of_queue(struct snd_seq_event *event,
569                                      int queue, int real_time)
570 {
571         struct snd_seq_queue *q;
572 
573         q = queueptr(queue);
574         if (! q)
575                 return 0;
576         event->queue = queue;
577         event->flags &= ~SNDRV_SEQ_TIME_STAMP_MASK;
578         if (real_time) {
579                 event->time.time = snd_seq_timer_get_cur_time(q->timer);
580                 event->flags |= SNDRV_SEQ_TIME_STAMP_REAL;
581         } else {
582                 event->time.tick = snd_seq_timer_get_cur_tick(q->timer);
583                 event->flags |= SNDRV_SEQ_TIME_STAMP_TICK;
584         }
585         queuefree(q);
586         return 1;
587 }
588 
589 
590 /*
591  * deliver an event to the specified destination.
592  * if filter is non-zero, client filter bitmap is tested.
593  *
594  *  RETURN VALUE: 0 : if succeeded
595  *               <0 : error
596  */
597 static int snd_seq_deliver_single_event(struct snd_seq_client *client,
598                                         struct snd_seq_event *event,
599                                         int filter, int atomic, int hop)
600 {
601         struct snd_seq_client *dest = NULL;
602         struct snd_seq_client_port *dest_port = NULL;
603         int result = -ENOENT;
604         int direct;
605 
606         direct = snd_seq_ev_is_direct(event);
607 
608         dest = get_event_dest_client(event, filter);
609         if (dest == NULL)
610                 goto __skip;
611         dest_port = snd_seq_port_use_ptr(dest, event->dest.port);
612         if (dest_port == NULL)
613                 goto __skip;
614 
615         /* check permission */
616         if (! check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE)) {
617                 result = -EPERM;
618                 goto __skip;
619         }
620                 
621         if (dest_port->timestamping)
622                 update_timestamp_of_queue(event, dest_port->time_queue,
623                                           dest_port->time_real);
624 
625         switch (dest->type) {
626         case USER_CLIENT:
627                 if (dest->data.user.fifo)
628                         result = snd_seq_fifo_event_in(dest->data.user.fifo, event);
629                 break;
630 
631         case KERNEL_CLIENT:
632                 if (dest_port->event_input == NULL)
633                         break;
634                 result = dest_port->event_input(event, direct,
635                                                 dest_port->private_data,
636                                                 atomic, hop);
637                 break;
638         default:
639                 break;
640         }
641 
642   __skip:
643         if (dest_port)
644                 snd_seq_port_unlock(dest_port);
645         if (dest)
646                 snd_seq_client_unlock(dest);
647 
648         if (result < 0 && !direct) {
649                 result = bounce_error_event(client, event, result, atomic, hop);
650         }
651         return result;
652 }
653 
654 
655 /*
656  * send the event to all subscribers:
657  */
658 static int deliver_to_subscribers(struct snd_seq_client *client,
659                                   struct snd_seq_event *event,
660                                   int atomic, int hop)
661 {
662         struct snd_seq_subscribers *subs;
663         int err = 0, num_ev = 0;
664         struct snd_seq_event event_saved;
665         struct snd_seq_client_port *src_port;
666         struct snd_seq_port_subs_info *grp;
667 
668         src_port = snd_seq_port_use_ptr(client, event->source.port);
669         if (src_port == NULL)
670                 return -EINVAL; /* invalid source port */
671         /* save original event record */
672         event_saved = *event;
673         grp = &src_port->c_src;
674         
675         /* lock list */
676         if (atomic)
677                 read_lock(&grp->list_lock);
678         else
679                 down_read(&grp->list_mutex);
680         list_for_each_entry(subs, &grp->list_head, src_list) {
681                 event->dest = subs->info.dest;
682                 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
683                         /* convert time according to flag with subscription */
684                         update_timestamp_of_queue(event, subs->info.queue,
685                                                   subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL);
686                 err = snd_seq_deliver_single_event(client, event,
687                                                    0, atomic, hop);
688                 if (err < 0)
689                         break;
690                 num_ev++;
691                 /* restore original event record */
692                 *event = event_saved;
693         }
694         if (atomic)
695                 read_unlock(&grp->list_lock);
696         else
697                 up_read(&grp->list_mutex);
698         *event = event_saved; /* restore */
699         snd_seq_port_unlock(src_port);
700         return (err < 0) ? err : num_ev;
701 }
702 
703 
704 #ifdef SUPPORT_BROADCAST 
705 /*
706  * broadcast to all ports:
707  */
708 static int port_broadcast_event(struct snd_seq_client *client,
709                                 struct snd_seq_event *event,
710                                 int atomic, int hop)
711 {
712         int num_ev = 0, err = 0;
713         struct snd_seq_client *dest_client;
714         struct snd_seq_client_port *port;
715 
716         dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST);
717         if (dest_client == NULL)
718                 return 0; /* no matching destination */
719 
720         read_lock(&dest_client->ports_lock);
721         list_for_each_entry(port, &dest_client->ports_list_head, list) {
722                 event->dest.port = port->addr.port;
723                 /* pass NULL as source client to avoid error bounce */
724                 err = snd_seq_deliver_single_event(NULL, event,
725                                                    SNDRV_SEQ_FILTER_BROADCAST,
726                                                    atomic, hop);
727                 if (err < 0)
728                         break;
729                 num_ev++;
730         }
731         read_unlock(&dest_client->ports_lock);
732         snd_seq_client_unlock(dest_client);
733         event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */
734         return (err < 0) ? err : num_ev;
735 }
736 
737 /*
738  * send the event to all clients:
739  * if destination port is also ADDRESS_BROADCAST, deliver to all ports.
740  */
741 static int broadcast_event(struct snd_seq_client *client,
742                            struct snd_seq_event *event, int atomic, int hop)
743 {
744         int err = 0, num_ev = 0;
745         int dest;
746         struct snd_seq_addr addr;
747 
748         addr = event->dest; /* save */
749 
750         for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) {
751                 /* don't send to itself */
752                 if (dest == client->number)
753                         continue;
754                 event->dest.client = dest;
755                 event->dest.port = addr.port;
756                 if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST)
757                         err = port_broadcast_event(client, event, atomic, hop);
758                 else
759                         /* pass NULL as source client to avoid error bounce */
760                         err = snd_seq_deliver_single_event(NULL, event,
761                                                            SNDRV_SEQ_FILTER_BROADCAST,
762                                                            atomic, hop);
763                 if (err < 0)
764                         break;
765                 num_ev += err;
766         }
767         event->dest = addr; /* restore */
768         return (err < 0) ? err : num_ev;
769 }
770 
771 
772 /* multicast - not supported yet */
773 static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event,
774                            int atomic, int hop)
775 {
776         snd_printd("seq: multicast not supported yet.\n");
777         return 0; /* ignored */
778 }
779 #endif /* SUPPORT_BROADCAST */
780 
781 
782 /* deliver an event to the destination port(s).
783  * if the event is to subscribers or broadcast, the event is dispatched
784  * to multiple targets.
785  *
786  * RETURN VALUE: n > 0  : the number of delivered events.
787  *               n == 0 : the event was not passed to any client.
788  *               n < 0  : error - event was not processed.
789  */
790 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event,
791                                  int atomic, int hop)
792 {
793         int result;
794 
795         hop++;
796         if (hop >= SNDRV_SEQ_MAX_HOPS) {
797                 snd_printd("too long delivery path (%d:%d->%d:%d)\n",
798                            event->source.client, event->source.port,
799                            event->dest.client, event->dest.port);
800                 return -EMLINK;
801         }
802 
803         if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS ||
804             event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS)
805                 result = deliver_to_subscribers(client, event, atomic, hop);
806 #ifdef SUPPORT_BROADCAST
807         else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST ||
808                  event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST)
809                 result = broadcast_event(client, event, atomic, hop);
810         else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS)
811                 result = multicast_event(client, event, atomic, hop);
812         else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST)
813                 result = port_broadcast_event(client, event, atomic, hop);
814 #endif
815         else
816                 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop);
817 
818         return result;
819 }
820 
821 /*
822  * dispatch an event cell:
823  * This function is called only from queue check routines in timer
824  * interrupts or after enqueued.
825  * The event cell shall be released or re-queued in this function.
826  *
827  * RETURN VALUE: n > 0  : the number of delivered events.
828  *               n == 0 : the event was not passed to any client.
829  *               n < 0  : error - event was not processed.
830  */
831 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop)
832 {
833         struct snd_seq_client *client;
834         int result;
835 
836         if (snd_BUG_ON(!cell))
837                 return -EINVAL;
838 
839         client = snd_seq_client_use_ptr(cell->event.source.client);
840         if (client == NULL) {
841                 snd_seq_cell_free(cell); /* release this cell */
842                 return -EINVAL;
843         }
844 
845         if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) {
846                 /* NOTE event:
847                  * the event cell is re-used as a NOTE-OFF event and
848                  * enqueued again.
849                  */
850                 struct snd_seq_event tmpev, *ev;
851 
852                 /* reserve this event to enqueue note-off later */
853                 tmpev = cell->event;
854                 tmpev.type = SNDRV_SEQ_EVENT_NOTEON;
855                 result = snd_seq_deliver_event(client, &tmpev, atomic, hop);
856 
857                 /*
858                  * This was originally a note event.  We now re-use the
859                  * cell for the note-off event.
860                  */
861 
862                 ev = &cell->event;
863                 ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
864                 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH;
865 
866                 /* add the duration time */
867                 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) {
868                 case SNDRV_SEQ_TIME_STAMP_TICK:
869                         ev->time.tick += ev->data.note.duration;
870                         break;
871                 case SNDRV_SEQ_TIME_STAMP_REAL:
872                         /* unit for duration is ms */
873                         ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000);
874                         ev->time.time.tv_sec += ev->data.note.duration / 1000 +
875                                                 ev->time.time.tv_nsec / 1000000000;
876                         ev->time.time.tv_nsec %= 1000000000;
877                         break;
878                 }
879                 ev->data.note.velocity = ev->data.note.off_velocity;
880 
881                 /* Now queue this cell as the note off event */
882                 if (snd_seq_enqueue_event(cell, atomic, hop) < 0)
883                         snd_seq_cell_free(cell); /* release this cell */
884 
885         } else {
886                 /* Normal events:
887                  * event cell is freed after processing the event
888                  */
889 
890                 result = snd_seq_deliver_event(client, &cell->event, atomic, hop);
891                 snd_seq_cell_free(cell);
892         }
893 
894         snd_seq_client_unlock(client);
895         return result;
896 }
897 
898 
899 /* Allocate a cell from client pool and enqueue it to queue:
900  * if pool is empty and blocking is TRUE, sleep until a new cell is
901  * available.
902  */
903 static int snd_seq_client_enqueue_event(struct snd_seq_client *client,
904                                         struct snd_seq_event *event,
905                                         struct file *file, int blocking,
906                                         int atomic, int hop)
907 {
908         struct snd_seq_event_cell *cell;
909         int err;
910 
911         /* special queue values - force direct passing */
912         if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
913                 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
914                 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
915         } else
916 #ifdef SUPPORT_BROADCAST
917                 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) {
918                         event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST;
919                         event->queue = SNDRV_SEQ_QUEUE_DIRECT;
920                 }
921 #endif
922         if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
923                 /* check presence of source port */
924                 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port);
925                 if (src_port == NULL)
926                         return -EINVAL;
927                 snd_seq_port_unlock(src_port);
928         }
929 
930         /* direct event processing without enqueued */
931         if (snd_seq_ev_is_direct(event)) {
932                 if (event->type == SNDRV_SEQ_EVENT_NOTE)
933                         return -EINVAL; /* this event must be enqueued! */
934                 return snd_seq_deliver_event(client, event, atomic, hop);
935         }
936 
937         /* Not direct, normal queuing */
938         if (snd_seq_queue_is_used(event->queue, client->number) <= 0)
939                 return -EINVAL;  /* invalid queue */
940         if (! snd_seq_write_pool_allocated(client))
941                 return -ENXIO; /* queue is not allocated */
942 
943         /* allocate an event cell */
944         err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, file);
945         if (err < 0)
946                 return err;
947 
948         /* we got a cell. enqueue it. */
949         if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
950                 snd_seq_cell_free(cell);
951                 return err;
952         }
953 
954         return 0;
955 }
956 
957 
958 /*
959  * check validity of event type and data length.
960  * return non-zero if invalid.
961  */
962 static int check_event_type_and_length(struct snd_seq_event *ev)
963 {
964         switch (snd_seq_ev_length_type(ev)) {
965         case SNDRV_SEQ_EVENT_LENGTH_FIXED:
966                 if (snd_seq_ev_is_variable_type(ev))
967                         return -EINVAL;
968                 break;
969         case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
970                 if (! snd_seq_ev_is_variable_type(ev) ||
971                     (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
972                         return -EINVAL;
973                 break;
974         case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
975                 if (! snd_seq_ev_is_direct(ev))
976                         return -EINVAL;
977                 break;
978         }
979         return 0;
980 }
981 
982 
983 /* handle write() */
984 /* possible error values:
985  *      -ENXIO  invalid client or file open mode
986  *      -ENOMEM malloc failed
987  *      -EFAULT seg. fault during copy from user space
988  *      -EINVAL invalid event
989  *      -EAGAIN no space in output pool
990  *      -EINTR  interrupts while sleep
991  *      -EMLINK too many hops
992  *      others  depends on return value from driver callback
993  */
994 static ssize_t snd_seq_write(struct file *file, const char __user *buf,
995                              size_t count, loff_t *offset)
996 {
997         struct snd_seq_client *client = file->private_data;
998         int written = 0, len;
999         int err = -EINVAL;
1000         struct snd_seq_event event;
1001 
1002         if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
1003                 return -ENXIO;
1004 
1005         /* check client structures are in place */
1006         if (snd_BUG_ON(!client))
1007                 return -ENXIO;
1008                 
1009         if (!client->accept_output || client->pool == NULL)
1010                 return -ENXIO;
1011 
1012         /* allocate the pool now if the pool is not allocated yet */ 
1013         if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
1014                 if (snd_seq_pool_init(client->pool) < 0)
1015                         return -ENOMEM;
1016         }
1017 
1018         /* only process whole events */
1019         while (count >= sizeof(struct snd_seq_event)) {
1020                 /* Read in the event header from the user */
1021                 len = sizeof(event);
1022                 if (copy_from_user(&event, buf, len)) {
1023                         err = -EFAULT;
1024                         break;
1025                 }
1026                 event.source.client = client->number;   /* fill in client number */
1027                 /* Check for extension data length */
1028                 if (check_event_type_and_length(&event)) {
1029                         err = -EINVAL;
1030                         break;
1031                 }
1032 
1033                 /* check for special events */
1034                 if (event.type == SNDRV_SEQ_EVENT_NONE)
1035                         goto __skip_event;
1036                 else if (snd_seq_ev_is_reserved(&event)) {
1037                         err = -EINVAL;
1038                         break;
1039                 }
1040 
1041                 if (snd_seq_ev_is_variable(&event)) {
1042                         int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK;
1043                         if ((size_t)(extlen + len) > count) {
1044                                 /* back out, will get an error this time or next */
1045                                 err = -EINVAL;
1046                                 break;
1047                         }
1048                         /* set user space pointer */
1049                         event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
1050                         event.data.ext.ptr = (char __force *)buf
1051                                                 + sizeof(struct snd_seq_event);
1052                         len += extlen; /* increment data length */
1053                 } else {
1054 #ifdef CONFIG_COMPAT
1055                         if (client->convert32 && snd_seq_ev_is_varusr(&event)) {
1056                                 void *ptr = (void __force *)compat_ptr(event.data.raw32.d[1]);
1057                                 event.data.ext.ptr = ptr;
1058                         }
1059 #endif
1060                 }
1061 
1062                 /* ok, enqueue it */
1063                 err = snd_seq_client_enqueue_event(client, &event, file,
1064                                                    !(file->f_flags & O_NONBLOCK),
1065                                                    0, 0);
1066                 if (err < 0)
1067                         break;
1068 
1069         __skip_event:
1070                 /* Update pointers and counts */
1071                 count -= len;
1072                 buf += len;
1073                 written += len;
1074         }
1075 
1076         return written ? written : err;
1077 }
1078 
1079 
1080 /*
1081  * handle polling
1082  */
1083 static unsigned int snd_seq_poll(struct file *file, poll_table * wait)
1084 {
1085         struct snd_seq_client *client = file->private_data;
1086         unsigned int mask = 0;
1087 
1088         /* check client structures are in place */
1089         if (snd_BUG_ON(!client))
1090                 return -ENXIO;
1091 
1092         if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1093             client->data.user.fifo) {
1094 
1095                 /* check if data is available in the outqueue */
1096                 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
1097                         mask |= POLLIN | POLLRDNORM;
1098         }
1099 
1100         if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1101 
1102                 /* check if data is available in the pool */
1103                 if (!snd_seq_write_pool_allocated(client) ||
1104                     snd_seq_pool_poll_wait(client->pool, file, wait))
1105                         mask |= POLLOUT | POLLWRNORM;
1106         }
1107 
1108         return mask;
1109 }
1110 
1111 
1112 /*-----------------------------------------------------*/
1113 
1114 
1115 /* SYSTEM_INFO ioctl() */
1116 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void __user *arg)
1117 {
1118         struct snd_seq_system_info info;
1119 
1120         memset(&info, 0, sizeof(info));
1121         /* fill the info fields */
1122         info.queues = SNDRV_SEQ_MAX_QUEUES;
1123         info.clients = SNDRV_SEQ_MAX_CLIENTS;
1124         info.ports = 256;       /* fixed limit */
1125         info.channels = 256;    /* fixed limit */
1126         info.cur_clients = client_usage.cur;
1127         info.cur_queues = snd_seq_queue_get_cur_queues();
1128 
1129         if (copy_to_user(arg, &info, sizeof(info)))
1130                 return -EFAULT;
1131         return 0;
1132 }
1133 
1134 
1135 /* RUNNING_MODE ioctl() */
1136 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void __user *arg)
1137 {
1138         struct snd_seq_running_info info;
1139         struct snd_seq_client *cptr;
1140         int err = 0;
1141 
1142         if (copy_from_user(&info, arg, sizeof(info)))
1143                 return -EFAULT;
1144 
1145         /* requested client number */
1146         cptr = snd_seq_client_use_ptr(info.client);
1147         if (cptr == NULL)
1148                 return -ENOENT;         /* don't change !!! */
1149 
1150 #ifdef SNDRV_BIG_ENDIAN
1151         if (! info.big_endian) {
1152                 err = -EINVAL;
1153                 goto __err;
1154         }
1155 #else
1156         if (info.big_endian) {
1157                 err = -EINVAL;
1158                 goto __err;
1159         }
1160 
1161 #endif
1162         if (info.cpu_mode > sizeof(long)) {
1163                 err = -EINVAL;
1164                 goto __err;
1165         }
1166         cptr->convert32 = (info.cpu_mode < sizeof(long));
1167  __err:
1168         snd_seq_client_unlock(cptr);
1169         return err;
1170 }
1171 
1172 /* CLIENT_INFO ioctl() */
1173 static void get_client_info(struct snd_seq_client *cptr,
1174                             struct snd_seq_client_info *info)
1175 {
1176         info->client = cptr->number;
1177 
1178         /* fill the info fields */
1179         info->type = cptr->type;
1180         strcpy(info->name, cptr->name);
1181         info->filter = cptr->filter;
1182         info->event_lost = cptr->event_lost;
1183         memcpy(info->event_filter, cptr->event_filter, 32);
1184         info->num_ports = cptr->num_ports;
1185         memset(info->reserved, 0, sizeof(info->reserved));
1186 }
1187 
1188 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
1189                                          void __user *arg)
1190 {
1191         struct snd_seq_client *cptr;
1192         struct snd_seq_client_info client_info;
1193 
1194         if (copy_from_user(&client_info, arg, sizeof(client_info)))
1195                 return -EFAULT;
1196 
1197         /* requested client number */
1198         cptr = snd_seq_client_use_ptr(client_info.client);
1199         if (cptr == NULL)
1200                 return -ENOENT;         /* don't change !!! */
1201 
1202         get_client_info(cptr, &client_info);
1203         snd_seq_client_unlock(cptr);
1204 
1205         if (copy_to_user(arg, &client_info, sizeof(client_info)))
1206                 return -EFAULT;
1207         return 0;
1208 }
1209 
1210 
1211 /* CLIENT_INFO ioctl() */
1212 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
1213                                          void __user *arg)
1214 {
1215         struct snd_seq_client_info client_info;
1216 
1217         if (copy_from_user(&client_info, arg, sizeof(client_info)))
1218                 return -EFAULT;
1219 
1220         /* it is not allowed to set the info fields for an another client */
1221         if (client->number != client_info.client)
1222                 return -EPERM;
1223         /* also client type must be set now */
1224         if (client->type != client_info.type)
1225                 return -EINVAL;
1226 
1227         /* fill the info fields */
1228         if (client_info.name[0])
1229                 strlcpy(client->name, client_info.name, sizeof(client->name));
1230 
1231         client->filter = client_info.filter;
1232         client->event_lost = client_info.event_lost;
1233         memcpy(client->event_filter, client_info.event_filter, 32);
1234 
1235         return 0;
1236 }
1237 
1238 
1239 /* 
1240  * CREATE PORT ioctl() 
1241  */
1242 static int snd_seq_ioctl_create_port(struct snd_seq_client *client,
1243                                      void __user *arg)
1244 {
1245         struct snd_seq_client_port *port;
1246         struct snd_seq_port_info info;
1247         struct snd_seq_port_callback *callback;
1248 
1249         if (copy_from_user(&info, arg, sizeof(info)))
1250                 return -EFAULT;
1251 
1252         /* it is not allowed to create the port for an another client */
1253         if (info.addr.client != client->number)
1254                 return -EPERM;
1255 
1256         port = snd_seq_create_port(client, (info.flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info.addr.port : -1);
1257         if (port == NULL)
1258                 return -ENOMEM;
1259 
1260         if (client->type == USER_CLIENT && info.kernel) {
1261                 snd_seq_delete_port(client, port->addr.port);
1262                 return -EINVAL;
1263         }
1264         if (client->type == KERNEL_CLIENT) {
1265                 if ((callback = info.kernel) != NULL) {
1266                         if (callback->owner)
1267                                 port->owner = callback->owner;
1268                         port->private_data = callback->private_data;
1269                         port->private_free = callback->private_free;
1270                         port->callback_all = callback->callback_all;
1271                         port->event_input = callback->event_input;
1272                         port->c_src.open = callback->subscribe;
1273                         port->c_src.close = callback->unsubscribe;
1274                         port->c_dest.open = callback->use;
1275                         port->c_dest.close = callback->unuse;
1276                 }
1277         }
1278 
1279         info.addr = port->addr;
1280 
1281         snd_seq_set_port_info(port, &info);
1282         snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1283 
1284         if (copy_to_user(arg, &info, sizeof(info)))
1285                 return -EFAULT;
1286 
1287         return 0;
1288 }
1289 
1290 /* 
1291  * DELETE PORT ioctl() 
1292  */
1293 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client,
1294                                      void __user *arg)
1295 {
1296         struct snd_seq_port_info info;
1297         int err;
1298 
1299         /* set passed parameters */
1300         if (copy_from_user(&info, arg, sizeof(info)))
1301                 return -EFAULT;
1302         
1303         /* it is not allowed to remove the port for an another client */
1304         if (info.addr.client != client->number)
1305                 return -EPERM;
1306 
1307         err = snd_seq_delete_port(client, info.addr.port);
1308         if (err >= 0)
1309                 snd_seq_system_client_ev_port_exit(client->number, info.addr.port);
1310         return err;
1311 }
1312 
1313 
1314 /* 
1315  * GET_PORT_INFO ioctl() (on any client) 
1316  */
1317 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client,
1318                                        void __user *arg)
1319 {
1320         struct snd_seq_client *cptr;
1321         struct snd_seq_client_port *port;
1322         struct snd_seq_port_info info;
1323 
1324         if (copy_from_user(&info, arg, sizeof(info)))
1325                 return -EFAULT;
1326         cptr = snd_seq_client_use_ptr(info.addr.client);
1327         if (cptr == NULL)
1328                 return -ENXIO;
1329 
1330         port = snd_seq_port_use_ptr(cptr, info.addr.port);
1331         if (port == NULL) {
1332                 snd_seq_client_unlock(cptr);
1333                 return -ENOENT;                 /* don't change */
1334         }
1335 
1336         /* get port info */
1337         snd_seq_get_port_info(port, &info);
1338         snd_seq_port_unlock(port);
1339         snd_seq_client_unlock(cptr);
1340 
1341         if (copy_to_user(arg, &info, sizeof(info)))
1342                 return -EFAULT;
1343         return 0;
1344 }
1345 
1346 
1347 /* 
1348  * SET_PORT_INFO ioctl() (only ports on this/own client) 
1349  */
1350 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client,
1351                                        void __user *arg)
1352 {
1353         struct snd_seq_client_port *port;
1354         struct snd_seq_port_info info;
1355 
1356         if (copy_from_user(&info, arg, sizeof(info)))
1357                 return -EFAULT;
1358 
1359         if (info.addr.client != client->number) /* only set our own ports ! */
1360                 return -EPERM;
1361         port = snd_seq_port_use_ptr(client, info.addr.port);
1362         if (port) {
1363                 snd_seq_set_port_info(port, &info);
1364                 snd_seq_port_unlock(port);
1365         }
1366         return 0;
1367 }
1368 
1369 
1370 /*
1371  * port subscription (connection)
1372  */
1373 #define PERM_RD         (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1374 #define PERM_WR         (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1375 
1376 static int check_subscription_permission(struct snd_seq_client *client,
1377                                          struct snd_seq_client_port *sport,
1378                                          struct snd_seq_client_port *dport,
1379                                          struct snd_seq_port_subscribe *subs)
1380 {
1381         if (client->number != subs->sender.client &&
1382             client->number != subs->dest.client) {
1383                 /* connection by third client - check export permission */
1384                 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1385                         return -EPERM;
1386                 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1387                         return -EPERM;
1388         }
1389 
1390         /* check read permission */
1391         /* if sender or receiver is the subscribing client itself,
1392          * no permission check is necessary
1393          */
1394         if (client->number != subs->sender.client) {
1395                 if (! check_port_perm(sport, PERM_RD))
1396                         return -EPERM;
1397         }
1398         /* check write permission */
1399         if (client->number != subs->dest.client) {
1400                 if (! check_port_perm(dport, PERM_WR))
1401                         return -EPERM;
1402         }
1403         return 0;
1404 }
1405 
1406 /*
1407  * send an subscription notify event to user client:
1408  * client must be user client.
1409  */
1410 int snd_seq_client_notify_subscription(int client, int port,
1411                                        struct snd_seq_port_subscribe *info,
1412                                        int evtype)
1413 {
1414         struct snd_seq_event event;
1415 
1416         memset(&event, 0, sizeof(event));
1417         event.type = evtype;
1418         event.data.connect.dest = info->dest;
1419         event.data.connect.sender = info->sender;
1420 
1421         return snd_seq_system_notify(client, port, &event);  /* non-atomic */
1422 }
1423 
1424 
1425 /* 
1426  * add to port's subscription list IOCTL interface 
1427  */
1428 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
1429                                         void __user *arg)
1430 {
1431         int result = -EINVAL;
1432         struct snd_seq_client *receiver = NULL, *sender = NULL;
1433         struct snd_seq_client_port *sport = NULL, *dport = NULL;
1434         struct snd_seq_port_subscribe subs;
1435 
1436         if (copy_from_user(&subs, arg, sizeof(subs)))
1437                 return -EFAULT;
1438 
1439         if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1440                 goto __end;
1441         if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1442                 goto __end;
1443         if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1444                 goto __end;
1445         if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1446                 goto __end;
1447 
1448         result = check_subscription_permission(client, sport, dport, &subs);
1449         if (result < 0)
1450                 goto __end;
1451 
1452         /* connect them */
1453         result = snd_seq_port_connect(client, sender, sport, receiver, dport, &subs);
1454         if (! result) /* broadcast announce */
1455                 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1456                                                    &subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1457       __end:
1458         if (sport)
1459                 snd_seq_port_unlock(sport);
1460         if (dport)
1461                 snd_seq_port_unlock(dport);
1462         if (sender)
1463                 snd_seq_client_unlock(sender);
1464         if (receiver)
1465                 snd_seq_client_unlock(receiver);
1466         return result;
1467 }
1468 
1469 
1470 /* 
1471  * remove from port's subscription list 
1472  */
1473 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
1474                                           void __user *arg)
1475 {
1476         int result = -ENXIO;
1477         struct snd_seq_client *receiver = NULL, *sender = NULL;
1478         struct snd_seq_client_port *sport = NULL, *dport = NULL;
1479         struct snd_seq_port_subscribe subs;
1480 
1481         if (copy_from_user(&subs, arg, sizeof(subs)))
1482                 return -EFAULT;
1483 
1484         if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1485                 goto __end;
1486         if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1487                 goto __end;
1488         if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1489                 goto __end;
1490         if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1491                 goto __end;
1492 
1493         result = check_subscription_permission(client, sport, dport, &subs);
1494         if (result < 0)
1495                 goto __end;
1496 
1497         result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, &subs);
1498         if (! result) /* broadcast announce */
1499                 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1500                                                    &subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1501       __end:
1502         if (sport)
1503                 snd_seq_port_unlock(sport);
1504         if (dport)
1505                 snd_seq_port_unlock(dport);
1506         if (sender)
1507                 snd_seq_client_unlock(sender);
1508         if (receiver)
1509                 snd_seq_client_unlock(receiver);
1510         return result;
1511 }
1512 
1513 
1514 /* CREATE_QUEUE ioctl() */
1515 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client,
1516                                       void __user *arg)
1517 {
1518         struct snd_seq_queue_info info;
1519         int result;
1520         struct snd_seq_queue *q;
1521 
1522         if (copy_from_user(&info, arg, sizeof(info)))
1523                 return -EFAULT;
1524 
1525         result = snd_seq_queue_alloc(client->number, info.locked, info.flags);
1526         if (result < 0)
1527                 return result;
1528 
1529         q = queueptr(result);
1530         if (q == NULL)
1531                 return -EINVAL;
1532 
1533         info.queue = q->queue;
1534         info.locked = q->locked;
1535         info.owner = q->owner;
1536 
1537         /* set queue name */
1538         if (! info.name[0])
1539                 snprintf(info.name, sizeof(info.name), "Queue-%d", q->queue);
1540         strlcpy(q->name, info.name, sizeof(q->name));
1541         queuefree(q);
1542 
1543         if (copy_to_user(arg, &info, sizeof(info)))
1544                 return -EFAULT;
1545 
1546         return 0;
1547 }
1548 
1549 /* DELETE_QUEUE ioctl() */
1550 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client,
1551                                       void __user *arg)
1552 {
1553         struct snd_seq_queue_info info;
1554 
1555         if (copy_from_user(&info, arg, sizeof(info)))
1556                 return -EFAULT;
1557 
1558         return snd_seq_queue_delete(client->number, info.queue);
1559 }
1560 
1561 /* GET_QUEUE_INFO ioctl() */
1562 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client,
1563                                         void __user *arg)
1564 {
1565         struct snd_seq_queue_info info;
1566         struct snd_seq_queue *q;
1567 
1568         if (copy_from_user(&info, arg, sizeof(info)))
1569                 return -EFAULT;
1570 
1571         q = queueptr(info.queue);
1572         if (q == NULL)
1573                 return -EINVAL;
1574 
1575         memset(&info, 0, sizeof(info));
1576         info.queue = q->queue;
1577         info.owner = q->owner;
1578         info.locked = q->locked;
1579         strlcpy(info.name, q->name, sizeof(info.name));
1580         queuefree(q);
1581 
1582         if (copy_to_user(arg, &info, sizeof(info)))
1583                 return -EFAULT;
1584 
1585         return 0;
1586 }
1587 
1588 /* SET_QUEUE_INFO ioctl() */
1589 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
1590                                         void __user *arg)
1591 {
1592         struct snd_seq_queue_info info;
1593         struct snd_seq_queue *q;
1594 
1595         if (copy_from_user(&info, arg, sizeof(info)))
1596                 return -EFAULT;
1597 
1598         if (info.owner != client->number)
1599                 return -EINVAL;
1600 
1601         /* change owner/locked permission */
1602         if (snd_seq_queue_check_access(info.queue, client->number)) {
1603                 if (snd_seq_queue_set_owner(info.queue, client->number, info.locked) < 0)
1604                         return -EPERM;
1605                 if (info.locked)
1606                         snd_seq_queue_use(info.queue, client->number, 1);
1607         } else {
1608                 return -EPERM;
1609         }       
1610 
1611         q = queueptr(info.queue);
1612         if (! q)
1613                 return -EINVAL;
1614         if (q->owner != client->number) {
1615                 queuefree(q);
1616                 return -EPERM;
1617         }
1618         strlcpy(q->name, info.name, sizeof(q->name));
1619         queuefree(q);
1620 
1621         return 0;
1622 }
1623 
1624 /* GET_NAMED_QUEUE ioctl() */
1625 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client, void __user *arg)
1626 {
1627         struct snd_seq_queue_info info;
1628         struct snd_seq_queue *q;
1629 
1630         if (copy_from_user(&info, arg, sizeof(info)))
1631                 return -EFAULT;
1632 
1633         q = snd_seq_queue_find_name(info.name);
1634         if (q == NULL)
1635                 return -EINVAL;
1636         info.queue = q->queue;
1637         info.owner = q->owner;
1638         info.locked = q->locked;
1639         queuefree(q);
1640 
1641         if (copy_to_user(arg, &info, sizeof(info)))
1642                 return -EFAULT;
1643 
1644         return 0;
1645 }
1646 
1647 /* GET_QUEUE_STATUS ioctl() */
1648 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
1649                                           void __user *arg)
1650 {
1651         struct snd_seq_queue_status status;
1652         struct snd_seq_queue *queue;
1653         struct snd_seq_timer *tmr;
1654 
1655         if (copy_from_user(&status, arg, sizeof(status)))
1656                 return -EFAULT;
1657 
1658         queue = queueptr(status.queue);
1659         if (queue == NULL)
1660                 return -EINVAL;
1661         memset(&status, 0, sizeof(status));
1662         status.queue = queue->queue;
1663         
1664         tmr = queue->timer;
1665         status.events = queue->tickq->cells + queue->timeq->cells;
1666 
1667         status.time = snd_seq_timer_get_cur_time(tmr);
1668         status.tick = snd_seq_timer_get_cur_tick(tmr);
1669 
1670         status.running = tmr->running;
1671 
1672         status.flags = queue->flags;
1673         queuefree(queue);
1674 
1675         if (copy_to_user(arg, &status, sizeof(status)))
1676                 return -EFAULT;
1677         return 0;
1678 }
1679 
1680 
1681 /* GET_QUEUE_TEMPO ioctl() */
1682 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
1683                                          void __user *arg)
1684 {
1685         struct snd_seq_queue_tempo tempo;
1686         struct snd_seq_queue *queue;
1687         struct snd_seq_timer *tmr;
1688 
1689         if (copy_from_user(&tempo, arg, sizeof(tempo)))
1690                 return -EFAULT;
1691 
1692         queue = queueptr(tempo.queue);
1693         if (queue == NULL)
1694                 return -EINVAL;
1695         memset(&tempo, 0, sizeof(tempo));
1696         tempo.queue = queue->queue;
1697         
1698         tmr = queue->timer;
1699 
1700         tempo.tempo = tmr->tempo;
1701         tempo.ppq = tmr->ppq;
1702         tempo.skew_value = tmr->skew;
1703         tempo.skew_base = tmr->skew_base;
1704         queuefree(queue);
1705 
1706         if (copy_to_user(arg, &tempo, sizeof(tempo)))
1707                 return -EFAULT;
1708         return 0;
1709 }
1710 
1711 
1712 /* SET_QUEUE_TEMPO ioctl() */
1713 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1714 {
1715         if (!snd_seq_queue_check_access(tempo->queue, client))
1716                 return -EPERM;
1717         return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1718 }
1719 
1720 EXPORT_SYMBOL(snd_seq_set_queue_tempo);
1721 
1722 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
1723                                          void __user *arg)
1724 {
1725         int result;
1726         struct snd_seq_queue_tempo tempo;
1727 
1728         if (copy_from_user(&tempo, arg, sizeof(tempo)))
1729                 return -EFAULT;
1730 
1731         result = snd_seq_set_queue_tempo(client->number, &tempo);
1732         return result < 0 ? result : 0;
1733 }
1734 
1735 
1736 /* GET_QUEUE_TIMER ioctl() */
1737 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
1738                                          void __user *arg)
1739 {
1740         struct snd_seq_queue_timer timer;
1741         struct snd_seq_queue *queue;
1742         struct snd_seq_timer *tmr;
1743 
1744         if (copy_from_user(&timer, arg, sizeof(timer)))
1745                 return -EFAULT;
1746 
1747         queue = queueptr(timer.queue);
1748         if (queue == NULL)
1749                 return -EINVAL;
1750 
1751         if (mutex_lock_interruptible(&queue->timer_mutex)) {
1752                 queuefree(queue);
1753                 return -ERESTARTSYS;
1754         }
1755         tmr = queue->timer;
1756         memset(&timer, 0, sizeof(timer));
1757         timer.queue = queue->queue;
1758 
1759         timer.type = tmr->type;
1760         if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1761                 timer.u.alsa.id = tmr->alsa_id;
1762                 timer.u.alsa.resolution = tmr->preferred_resolution;
1763         }
1764         mutex_unlock(&queue->timer_mutex);
1765         queuefree(queue);
1766         
1767         if (copy_to_user(arg, &timer, sizeof(timer)))
1768                 return -EFAULT;
1769         return 0;
1770 }
1771 
1772 
1773 /* SET_QUEUE_TIMER ioctl() */
1774 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
1775                                          void __user *arg)
1776 {
1777         int result = 0;
1778         struct snd_seq_queue_timer timer;
1779 
1780         if (copy_from_user(&timer, arg, sizeof(timer)))
1781                 return -EFAULT;
1782 
1783         if (timer.type != SNDRV_SEQ_TIMER_ALSA)
1784                 return -EINVAL;
1785 
1786         if (snd_seq_queue_check_access(timer.queue, client->number)) {
1787                 struct snd_seq_queue *q;
1788                 struct snd_seq_timer *tmr;
1789 
1790                 q = queueptr(timer.queue);
1791                 if (q == NULL)
1792                         return -ENXIO;
1793                 if (mutex_lock_interruptible(&q->timer_mutex)) {
1794                         queuefree(q);
1795                         return -ERESTARTSYS;
1796                 }
1797                 tmr = q->timer;
1798                 snd_seq_queue_timer_close(timer.queue);
1799                 tmr->type = timer.type;
1800                 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1801                         tmr->alsa_id = timer.u.alsa.id;
1802                         tmr->preferred_resolution = timer.u.alsa.resolution;
1803                 }
1804                 result = snd_seq_queue_timer_open(timer.queue);
1805                 mutex_unlock(&q->timer_mutex);
1806                 queuefree(q);
1807         } else {
1808                 return -EPERM;
1809         }       
1810 
1811         return result;
1812 }
1813 
1814 
1815 /* GET_QUEUE_CLIENT ioctl() */
1816 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
1817                                           void __user *arg)
1818 {
1819         struct snd_seq_queue_client info;
1820         int used;
1821 
1822         if (copy_from_user(&info, arg, sizeof(info)))
1823                 return -EFAULT;
1824 
1825         used = snd_seq_queue_is_used(info.queue, client->number);
1826         if (used < 0)
1827                 return -EINVAL;
1828         info.used = used;
1829         info.client = client->number;
1830 
1831         if (copy_to_user(arg, &info, sizeof(info)))
1832                 return -EFAULT;
1833         return 0;
1834 }
1835 
1836 
1837 /* SET_QUEUE_CLIENT ioctl() */
1838 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
1839                                           void __user *arg)
1840 {
1841         int err;
1842         struct snd_seq_queue_client info;
1843 
1844         if (copy_from_user(&info, arg, sizeof(info)))
1845                 return -EFAULT;
1846 
1847         if (info.used >= 0) {
1848                 err = snd_seq_queue_use(info.queue, client->number, info.used);
1849                 if (err < 0)
1850                         return err;
1851         }
1852 
1853         return snd_seq_ioctl_get_queue_client(client, arg);
1854 }
1855 
1856 
1857 /* GET_CLIENT_POOL ioctl() */
1858 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
1859                                          void __user *arg)
1860 {
1861         struct snd_seq_client_pool info;
1862         struct snd_seq_client *cptr;
1863 
1864         if (copy_from_user(&info, arg, sizeof(info)))
1865                 return -EFAULT;
1866 
1867         cptr = snd_seq_client_use_ptr(info.client);
1868         if (cptr == NULL)
1869                 return -ENOENT;
1870         memset(&info, 0, sizeof(info));
1871         info.output_pool = cptr->pool->size;
1872         info.output_room = cptr->pool->room;
1873         info.output_free = info.output_pool;
1874         info.output_free = snd_seq_unused_cells(cptr->pool);
1875         if (cptr->type == USER_CLIENT) {
1876                 info.input_pool = cptr->data.user.fifo_pool_size;
1877                 info.input_free = info.input_pool;
1878                 if (cptr->data.user.fifo)
1879                         info.input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool);
1880         } else {
1881                 info.input_pool = 0;
1882                 info.input_free = 0;
1883         }
1884         snd_seq_client_unlock(cptr);
1885         
1886         if (copy_to_user(arg, &info, sizeof(info)))
1887                 return -EFAULT;
1888         return 0;
1889 }
1890 
1891 /* SET_CLIENT_POOL ioctl() */
1892 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
1893                                          void __user *arg)
1894 {
1895         struct snd_seq_client_pool info;
1896         int rc;
1897 
1898         if (copy_from_user(&info, arg, sizeof(info)))
1899                 return -EFAULT;
1900 
1901         if (client->number != info.client)
1902                 return -EINVAL; /* can't change other clients */
1903 
1904         if (info.output_pool >= 1 && info.output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1905             (! snd_seq_write_pool_allocated(client) ||
1906              info.output_pool != client->pool->size)) {
1907                 if (snd_seq_write_pool_allocated(client)) {
1908                         /* remove all existing cells */
1909                         snd_seq_queue_client_leave_cells(client->number);
1910                         snd_seq_pool_done(client->pool);
1911                 }
1912                 client->pool->size = info.output_pool;
1913                 rc = snd_seq_pool_init(client->pool);
1914                 if (rc < 0)
1915                         return rc;
1916         }
1917         if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
1918             info.input_pool >= 1 &&
1919             info.input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1920             info.input_pool != client->data.user.fifo_pool_size) {
1921                 /* change pool size */
1922                 rc = snd_seq_fifo_resize(client->data.user.fifo, info.input_pool);
1923                 if (rc < 0)
1924                         return rc;
1925                 client->data.user.fifo_pool_size = info.input_pool;
1926         }
1927         if (info.output_room >= 1 &&
1928             info.output_room <= client->pool->size) {
1929                 client->pool->room  = info.output_room;
1930         }
1931 
1932         return snd_seq_ioctl_get_client_pool(client, arg);
1933 }
1934 
1935 
1936 /* REMOVE_EVENTS ioctl() */
1937 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
1938                                        void __user *arg)
1939 {
1940         struct snd_seq_remove_events info;
1941 
1942         if (copy_from_user(&info, arg, sizeof(info)))
1943                 return -EFAULT;
1944 
1945         /*
1946          * Input mostly not implemented XXX.
1947          */
1948         if (info.remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1949                 /*
1950                  * No restrictions so for a user client we can clear
1951                  * the whole fifo
1952                  */
1953                 if (client->type == USER_CLIENT)
1954                         snd_seq_fifo_clear(client->data.user.fifo);
1955         }
1956 
1957         if (info.remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1958                 snd_seq_queue_remove_cells(client->number, &info);
1959 
1960         return 0;
1961 }
1962 
1963 
1964 /*
1965  * get subscription info
1966  */
1967 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
1968                                           void __user *arg)
1969 {
1970         int result;
1971         struct snd_seq_client *sender = NULL;
1972         struct snd_seq_client_port *sport = NULL;
1973         struct snd_seq_port_subscribe subs;
1974         struct snd_seq_subscribers *p;
1975 
1976         if (copy_from_user(&subs, arg, sizeof(subs)))
1977                 return -EFAULT;
1978 
1979         result = -EINVAL;
1980         if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1981                 goto __end;
1982         if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1983                 goto __end;
1984         p = snd_seq_port_get_subscription(&sport->c_src, &subs.dest);
1985         if (p) {
1986                 result = 0;
1987                 subs = p->info;
1988         } else
1989                 result = -ENOENT;
1990 
1991       __end:
1992         if (sport)
1993                 snd_seq_port_unlock(sport);
1994         if (sender)
1995                 snd_seq_client_unlock(sender);
1996         if (result >= 0) {
1997                 if (copy_to_user(arg, &subs, sizeof(subs)))
1998                         return -EFAULT;
1999         }
2000         return result;
2001 }
2002 
2003 
2004 /*
2005  * get subscription info - check only its presence
2006  */
2007 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client,
2008                                     void __user *arg)
2009 {
2010         int result = -ENXIO;
2011         struct snd_seq_client *cptr = NULL;
2012         struct snd_seq_client_port *port = NULL;
2013         struct snd_seq_query_subs subs;
2014         struct snd_seq_port_subs_info *group;
2015         struct list_head *p;
2016         int i;
2017 
2018         if (copy_from_user(&subs, arg, sizeof(subs)))
2019                 return -EFAULT;
2020 
2021         if ((cptr = snd_seq_client_use_ptr(subs.root.client)) == NULL)
2022                 goto __end;
2023         if ((port = snd_seq_port_use_ptr(cptr, subs.root.port)) == NULL)
2024                 goto __end;
2025 
2026         switch (subs.type) {
2027         case SNDRV_SEQ_QUERY_SUBS_READ:
2028                 group = &port->c_src;
2029                 break;
2030         case SNDRV_SEQ_QUERY_SUBS_WRITE:
2031                 group = &port->c_dest;
2032                 break;
2033         default:
2034                 goto __end;
2035         }
2036 
2037         down_read(&group->list_mutex);
2038         /* search for the subscriber */
2039         subs.num_subs = group->count;
2040         i = 0;
2041         result = -ENOENT;
2042         list_for_each(p, &group->list_head) {
2043                 if (i++ == subs.index) {
2044                         /* found! */
2045                         struct snd_seq_subscribers *s;
2046                         if (subs.type == SNDRV_SEQ_QUERY_SUBS_READ) {
2047                                 s = list_entry(p, struct snd_seq_subscribers, src_list);
2048                                 subs.addr = s->info.dest;
2049                         } else {
2050                                 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2051                                 subs.addr = s->info.sender;
2052                         }
2053                         subs.flags = s->info.flags;
2054                         subs.queue = s->info.queue;
2055                         result = 0;
2056                         break;
2057                 }
2058         }
2059         up_read(&group->list_mutex);
2060 
2061       __end:
2062         if (port)
2063                 snd_seq_port_unlock(port);
2064         if (cptr)
2065                 snd_seq_client_unlock(cptr);
2066         if (result >= 0) {
2067                 if (copy_to_user(arg, &subs, sizeof(subs)))
2068                         return -EFAULT;
2069         }
2070         return result;
2071 }
2072 
2073 
2074 /*
2075  * query next client
2076  */
2077 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
2078                                            void __user *arg)
2079 {
2080         struct snd_seq_client *cptr = NULL;
2081         struct snd_seq_client_info info;
2082 
2083         if (copy_from_user(&info, arg, sizeof(info)))
2084                 return -EFAULT;
2085 
2086         /* search for next client */
2087         info.client++;
2088         if (info.client < 0)
2089                 info.client = 0;
2090         for (; info.client < SNDRV_SEQ_MAX_CLIENTS; info.client++) {
2091                 cptr = snd_seq_client_use_ptr(info.client);
2092                 if (cptr)
2093                         break; /* found */
2094         }
2095         if (cptr == NULL)
2096                 return -ENOENT;
2097 
2098         get_client_info(cptr, &info);
2099         snd_seq_client_unlock(cptr);
2100 
2101         if (copy_to_user(arg, &info, sizeof(info)))
2102                 return -EFAULT;
2103         return 0;
2104 }
2105 
2106 /* 
2107  * query next port
2108  */
2109 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
2110                                          void __user *arg)
2111 {
2112         struct snd_seq_client *cptr;
2113         struct snd_seq_client_port *port = NULL;
2114         struct snd_seq_port_info info;
2115 
2116         if (copy_from_user(&info, arg, sizeof(info)))
2117                 return -EFAULT;
2118         cptr = snd_seq_client_use_ptr(info.addr.client);
2119         if (cptr == NULL)
2120                 return -ENXIO;
2121 
2122         /* search for next port */
2123         info.addr.port++;
2124         port = snd_seq_port_query_nearest(cptr, &info);
2125         if (port == NULL) {
2126                 snd_seq_client_unlock(cptr);
2127                 return -ENOENT;
2128         }
2129 
2130         /* get port info */
2131         info.addr = port->addr;
2132         snd_seq_get_port_info(port, &info);
2133         snd_seq_port_unlock(port);
2134         snd_seq_client_unlock(cptr);
2135 
2136         if (copy_to_user(arg, &info, sizeof(info)))
2137                 return -EFAULT;
2138         return 0;
2139 }
2140 
2141 /* -------------------------------------------------------- */
2142 
2143 static struct seq_ioctl_table {
2144         unsigned int cmd;
2145         int (*func)(struct snd_seq_client *client, void __user * arg);
2146 } ioctl_tables[] = {
2147         { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2148         { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2149         { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2150         { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2151         { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2152         { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2153         { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2154         { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2155         { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2156         { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2157         { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2158         { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2159         { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2160         { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2161         { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2162         { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2163         { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2164         { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2165         { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2166         { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2167         { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2168         { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2169         { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2170         { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2171         { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2172         { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2173         { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2174         { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2175         { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2176         { 0, NULL },
2177 };
2178 
2179 static int snd_seq_do_ioctl(struct snd_seq_client *client, unsigned int cmd,
2180                             void __user *arg)
2181 {
2182         struct seq_ioctl_table *p;
2183 
2184         switch (cmd) {
2185         case SNDRV_SEQ_IOCTL_PVERSION:
2186                 /* return sequencer version number */
2187                 return put_user(SNDRV_SEQ_VERSION, (int __user *)arg) ? -EFAULT : 0;
2188         case SNDRV_SEQ_IOCTL_CLIENT_ID:
2189                 /* return the id of this client */
2190                 return put_user(client->number, (int __user *)arg) ? -EFAULT : 0;
2191         }
2192 
2193         if (! arg)
2194                 return -EFAULT;
2195         for (p = ioctl_tables; p->cmd; p++) {
2196                 if (p->cmd == cmd)
2197                         return p->func(client, arg);
2198         }
2199         snd_printd("seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n",
2200                    cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2201         return -ENOTTY;
2202 }
2203 
2204 
2205 static long snd_seq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2206 {
2207         struct snd_seq_client *client = file->private_data;
2208 
2209         if (snd_BUG_ON(!client))
2210                 return -ENXIO;
2211                 
2212         return snd_seq_do_ioctl(client, cmd, (void __user *) arg);
2213 }
2214 
2215 #ifdef CONFIG_COMPAT
2216 #include "seq_compat.c"
2217 #else
2218 #define snd_seq_ioctl_compat    NULL
2219 #endif
2220 
2221 /* -------------------------------------------------------- */
2222 
2223 
2224 /* exported to kernel modules */
2225 int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
2226                                  const char *name_fmt, ...)
2227 {
2228         struct snd_seq_client *client;
2229         va_list args;
2230 
2231         if (snd_BUG_ON(in_interrupt()))
2232                 return -EBUSY;
2233 
2234         if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD)
2235                 return -EINVAL;
2236         if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
2237                 return -EINVAL;
2238 
2239         if (mutex_lock_interruptible(&register_mutex))
2240                 return -ERESTARTSYS;
2241 
2242         if (card) {
2243                 client_index += SNDRV_SEQ_GLOBAL_CLIENTS
2244                         + card->number * SNDRV_SEQ_CLIENTS_PER_CARD;
2245                 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN)
2246                         client_index = -1;
2247         }
2248 
2249         /* empty write queue as default */
2250         client = seq_create_client1(client_index, 0);
2251         if (client == NULL) {
2252                 mutex_unlock(&register_mutex);
2253                 return -EBUSY;  /* failure code */
2254         }
2255         usage_alloc(&client_usage, 1);
2256 
2257         client->accept_input = 1;
2258         client->accept_output = 1;
2259                 
2260         va_start(args, name_fmt);
2261         vsnprintf(client->name, sizeof(client->name), name_fmt, args);
2262         va_end(args);
2263 
2264         client->type = KERNEL_CLIENT;
2265         mutex_unlock(&register_mutex);
2266 
2267         /* make others aware this new client */
2268         snd_seq_system_client_ev_client_start(client->number);
2269         
2270         /* return client number to caller */
2271         return client->number;
2272 }
2273 
2274 EXPORT_SYMBOL(snd_seq_create_kernel_client);
2275 
2276 /* exported to kernel modules */
2277 int snd_seq_delete_kernel_client(int client)
2278 {
2279         struct snd_seq_client *ptr;
2280 
2281         if (snd_BUG_ON(in_interrupt()))
2282                 return -EBUSY;
2283 
2284         ptr = clientptr(client);
2285         if (ptr == NULL)
2286                 return -EINVAL;
2287 
2288         seq_free_client(ptr);
2289         kfree(ptr);
2290         return 0;
2291 }
2292 
2293 EXPORT_SYMBOL(snd_seq_delete_kernel_client);
2294 
2295 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue
2296  * and snd_seq_kernel_client_enqueue_blocking
2297  */
2298 static int kernel_client_enqueue(int client, struct snd_seq_event *ev,
2299                                  struct file *file, int blocking,
2300                                  int atomic, int hop)
2301 {
2302         struct snd_seq_client *cptr;
2303         int result;
2304 
2305         if (snd_BUG_ON(!ev))
2306                 return -EINVAL;
2307 
2308         if (ev->type == SNDRV_SEQ_EVENT_NONE)
2309                 return 0; /* ignore this */
2310         if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2311                 return -EINVAL; /* quoted events can't be enqueued */
2312 
2313         /* fill in client number */
2314         ev->source.client = client;
2315 
2316         if (check_event_type_and_length(ev))
2317                 return -EINVAL;
2318 
2319         cptr = snd_seq_client_use_ptr(client);
2320         if (cptr == NULL)
2321                 return -EINVAL;
2322         
2323         if (! cptr->accept_output)
2324                 result = -EPERM;
2325         else /* send it */
2326                 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, atomic, hop);
2327 
2328         snd_seq_client_unlock(cptr);
2329         return result;
2330 }
2331 
2332 /*
2333  * exported, called by kernel clients to enqueue events (w/o blocking)
2334  *
2335  * RETURN VALUE: zero if succeed, negative if error
2336  */
2337 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev,
2338                                   int atomic, int hop)
2339 {
2340         return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop);
2341 }
2342 
2343 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
2344 
2345 /*
2346  * exported, called by kernel clients to enqueue events (with blocking)
2347  *
2348  * RETURN VALUE: zero if succeed, negative if error
2349  */
2350 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev,
2351                                            struct file *file,
2352                                            int atomic, int hop)
2353 {
2354         return kernel_client_enqueue(client, ev, file, 1, atomic, hop);
2355 }
2356 
2357 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking);
2358 
2359 /* 
2360  * exported, called by kernel clients to dispatch events directly to other
2361  * clients, bypassing the queues.  Event time-stamp will be updated.
2362  *
2363  * RETURN VALUE: negative = delivery failed,
2364  *               zero, or positive: the number of delivered events
2365  */
2366 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev,
2367                                    int atomic, int hop)
2368 {
2369         struct snd_seq_client *cptr;
2370         int result;
2371 
2372         if (snd_BUG_ON(!ev))
2373                 return -EINVAL;
2374 
2375         /* fill in client number */
2376         ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2377         ev->source.client = client;
2378 
2379         if (check_event_type_and_length(ev))
2380                 return -EINVAL;
2381 
2382         cptr = snd_seq_client_use_ptr(client);
2383         if (cptr == NULL)
2384                 return -EINVAL;
2385 
2386         if (!cptr->accept_output)
2387                 result = -EPERM;
2388         else
2389                 result = snd_seq_deliver_event(cptr, ev, atomic, hop);
2390 
2391         snd_seq_client_unlock(cptr);
2392         return result;
2393 }
2394 
2395 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch);
2396 
2397 /*
2398  * exported, called by kernel clients to perform same functions as with
2399  * userland ioctl() 
2400  */
2401 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2402 {
2403         struct snd_seq_client *client;
2404         mm_segment_t fs;
2405         int result;
2406 
2407         client = clientptr(clientid);
2408         if (client == NULL)
2409                 return -ENXIO;
2410         fs = snd_enter_user();
2411         result = snd_seq_do_ioctl(client, cmd, (void __force __user *)arg);
2412         snd_leave_user(fs);
2413         return result;
2414 }
2415 
2416 EXPORT_SYMBOL(snd_seq_kernel_client_ctl);
2417 
2418 /* exported (for OSS emulator) */
2419 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2420 {
2421         struct snd_seq_client *client;
2422 
2423         client = clientptr(clientid);
2424         if (client == NULL)
2425                 return -ENXIO;
2426 
2427         if (! snd_seq_write_pool_allocated(client))
2428                 return 1;
2429         if (snd_seq_pool_poll_wait(client->pool, file, wait))
2430                 return 1;
2431         return 0;
2432 }
2433 
2434 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll);
2435 
2436 /*---------------------------------------------------------------------------*/
2437 
2438 #ifdef CONFIG_PROC_FS
2439 /*
2440  *  /proc interface
2441  */
2442 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer,
2443                                           struct snd_seq_port_subs_info *group,
2444                                           int is_src, char *msg)
2445 {
2446         struct list_head *p;
2447         struct snd_seq_subscribers *s;
2448         int count = 0;
2449 
2450         down_read(&group->list_mutex);
2451         if (list_empty(&group->list_head)) {
2452                 up_read(&group->list_mutex);
2453                 return;
2454         }
2455         snd_iprintf(buffer, msg);
2456         list_for_each(p, &group->list_head) {
2457                 if (is_src)
2458                         s = list_entry(p, struct snd_seq_subscribers, src_list);
2459                 else
2460                         s = list_entry(p, struct snd_seq_subscribers, dest_list);
2461                 if (count++)
2462                         snd_iprintf(buffer, ", ");
2463                 snd_iprintf(buffer, "%d:%d",
2464                             is_src ? s->info.dest.client : s->info.sender.client,
2465                             is_src ? s->info.dest.port : s->info.sender.port);
2466                 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
2467                         snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
2468                 if (group->exclusive)
2469                         snd_iprintf(buffer, "[ex]");
2470         }
2471         up_read(&group->list_mutex);
2472         snd_iprintf(buffer, "\n");
2473 }
2474 
2475 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
2476 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
2477 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
2478 
2479 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2480 
2481 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
2482                                     struct snd_seq_client *client)
2483 {
2484         struct snd_seq_client_port *p;
2485 
2486         mutex_lock(&client->ports_mutex);
2487         list_for_each_entry(p, &client->ports_list_head, list) {
2488                 snd_iprintf(buffer, "  Port %3d : \"%s\" (%c%c%c%c)\n",
2489                             p->addr.port, p->name,
2490                             FLAG_PERM_RD(p->capability),
2491                             FLAG_PERM_WR(p->capability),
2492                             FLAG_PERM_EX(p->capability),
2493                             FLAG_PERM_DUPLEX(p->capability));
2494                 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, "    Connecting To: ");
2495                 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, "    Connected From: ");
2496         }
2497         mutex_unlock(&client->ports_mutex);
2498 }
2499 
2500 
2501 /* exported to seq_info.c */
2502 void snd_seq_info_clients_read(struct snd_info_entry *entry, 
2503                                struct snd_info_buffer *buffer)
2504 {
2505         int c;
2506         struct snd_seq_client *client;
2507 
2508         snd_iprintf(buffer, "Client info\n");
2509         snd_iprintf(buffer, "  cur  clients : %d\n", client_usage.cur);
2510         snd_iprintf(buffer, "  peak clients : %d\n", client_usage.peak);
2511         snd_iprintf(buffer, "  max  clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
2512         snd_iprintf(buffer, "\n");
2513 
2514         /* list the client table */
2515         for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2516                 client = snd_seq_client_use_ptr(c);
2517                 if (client == NULL)
2518                         continue;
2519                 if (client->type == NO_CLIENT) {
2520                         snd_seq_client_unlock(client);
2521                         continue;
2522                 }
2523 
2524                 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n",
2525                             c, client->name,
2526                             client->type == USER_CLIENT ? "User" : "Kernel");
2527                 snd_seq_info_dump_ports(buffer, client);
2528                 if (snd_seq_write_pool_allocated(client)) {
2529                         snd_iprintf(buffer, "  Output pool :\n");
2530                         snd_seq_info_pool(buffer, client->pool, "    ");
2531                 }
2532                 if (client->type == USER_CLIENT && client->data.user.fifo &&
2533                     client->data.user.fifo->pool) {
2534                         snd_iprintf(buffer, "  Input pool :\n");
2535                         snd_seq_info_pool(buffer, client->data.user.fifo->pool, "    ");
2536                 }
2537                 snd_seq_client_unlock(client);
2538         }
2539 }
2540 #endif /* CONFIG_PROC_FS */
2541 
2542 /*---------------------------------------------------------------------------*/
2543 
2544 
2545 /*
2546  *  REGISTRATION PART
2547  */
2548 
2549 static const struct file_operations snd_seq_f_ops =
2550 {
2551         .owner =        THIS_MODULE,
2552         .read =         snd_seq_read,
2553         .write =        snd_seq_write,
2554         .open =         snd_seq_open,
2555         .release =      snd_seq_release,
2556         .llseek =       no_llseek,
2557         .poll =         snd_seq_poll,
2558         .unlocked_ioctl =       snd_seq_ioctl,
2559         .compat_ioctl = snd_seq_ioctl_compat,
2560 };
2561 
2562 /* 
2563  * register sequencer device 
2564  */
2565 int __init snd_sequencer_device_init(void)
2566 {
2567         int err;
2568 
2569         if (mutex_lock_interruptible(&register_mutex))
2570                 return -ERESTARTSYS;
2571 
2572         if ((err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
2573                                        &snd_seq_f_ops, NULL, "seq")) < 0) {
2574                 mutex_unlock(&register_mutex);
2575                 return err;
2576         }
2577         
2578         mutex_unlock(&register_mutex);
2579 
2580         return 0;
2581 }
2582 
2583 
2584 
2585 /* 
2586  * unregister sequencer device 
2587  */
2588 void __exit snd_sequencer_device_done(void)
2589 {
2590         snd_unregister_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0);
2591 }
2592 

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