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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                 /* both ports ready? */
682                 if (atomic_read(&subs->ref_count) != 2)
683                         continue;
684                 event->dest = subs->info.dest;
685                 if (subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
686                         /* convert time according to flag with subscription */
687                         update_timestamp_of_queue(event, subs->info.queue,
688                                                   subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL);
689                 err = snd_seq_deliver_single_event(client, event,
690                                                    0, atomic, hop);
691                 if (err < 0)
692                         break;
693                 num_ev++;
694                 /* restore original event record */
695                 *event = event_saved;
696         }
697         if (atomic)
698                 read_unlock(&grp->list_lock);
699         else
700                 up_read(&grp->list_mutex);
701         *event = event_saved; /* restore */
702         snd_seq_port_unlock(src_port);
703         return (err < 0) ? err : num_ev;
704 }
705 
706 
707 #ifdef SUPPORT_BROADCAST 
708 /*
709  * broadcast to all ports:
710  */
711 static int port_broadcast_event(struct snd_seq_client *client,
712                                 struct snd_seq_event *event,
713                                 int atomic, int hop)
714 {
715         int num_ev = 0, err = 0;
716         struct snd_seq_client *dest_client;
717         struct snd_seq_client_port *port;
718 
719         dest_client = get_event_dest_client(event, SNDRV_SEQ_FILTER_BROADCAST);
720         if (dest_client == NULL)
721                 return 0; /* no matching destination */
722 
723         read_lock(&dest_client->ports_lock);
724         list_for_each_entry(port, &dest_client->ports_list_head, list) {
725                 event->dest.port = port->addr.port;
726                 /* pass NULL as source client to avoid error bounce */
727                 err = snd_seq_deliver_single_event(NULL, event,
728                                                    SNDRV_SEQ_FILTER_BROADCAST,
729                                                    atomic, hop);
730                 if (err < 0)
731                         break;
732                 num_ev++;
733         }
734         read_unlock(&dest_client->ports_lock);
735         snd_seq_client_unlock(dest_client);
736         event->dest.port = SNDRV_SEQ_ADDRESS_BROADCAST; /* restore */
737         return (err < 0) ? err : num_ev;
738 }
739 
740 /*
741  * send the event to all clients:
742  * if destination port is also ADDRESS_BROADCAST, deliver to all ports.
743  */
744 static int broadcast_event(struct snd_seq_client *client,
745                            struct snd_seq_event *event, int atomic, int hop)
746 {
747         int err = 0, num_ev = 0;
748         int dest;
749         struct snd_seq_addr addr;
750 
751         addr = event->dest; /* save */
752 
753         for (dest = 0; dest < SNDRV_SEQ_MAX_CLIENTS; dest++) {
754                 /* don't send to itself */
755                 if (dest == client->number)
756                         continue;
757                 event->dest.client = dest;
758                 event->dest.port = addr.port;
759                 if (addr.port == SNDRV_SEQ_ADDRESS_BROADCAST)
760                         err = port_broadcast_event(client, event, atomic, hop);
761                 else
762                         /* pass NULL as source client to avoid error bounce */
763                         err = snd_seq_deliver_single_event(NULL, event,
764                                                            SNDRV_SEQ_FILTER_BROADCAST,
765                                                            atomic, hop);
766                 if (err < 0)
767                         break;
768                 num_ev += err;
769         }
770         event->dest = addr; /* restore */
771         return (err < 0) ? err : num_ev;
772 }
773 
774 
775 /* multicast - not supported yet */
776 static int multicast_event(struct snd_seq_client *client, struct snd_seq_event *event,
777                            int atomic, int hop)
778 {
779         snd_printd("seq: multicast not supported yet.\n");
780         return 0; /* ignored */
781 }
782 #endif /* SUPPORT_BROADCAST */
783 
784 
785 /* deliver an event to the destination port(s).
786  * if the event is to subscribers or broadcast, the event is dispatched
787  * to multiple targets.
788  *
789  * RETURN VALUE: n > 0  : the number of delivered events.
790  *               n == 0 : the event was not passed to any client.
791  *               n < 0  : error - event was not processed.
792  */
793 static int snd_seq_deliver_event(struct snd_seq_client *client, struct snd_seq_event *event,
794                                  int atomic, int hop)
795 {
796         int result;
797 
798         hop++;
799         if (hop >= SNDRV_SEQ_MAX_HOPS) {
800                 snd_printd("too long delivery path (%d:%d->%d:%d)\n",
801                            event->source.client, event->source.port,
802                            event->dest.client, event->dest.port);
803                 return -EMLINK;
804         }
805 
806         if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS ||
807             event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS)
808                 result = deliver_to_subscribers(client, event, atomic, hop);
809 #ifdef SUPPORT_BROADCAST
810         else if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST ||
811                  event->dest.client == SNDRV_SEQ_ADDRESS_BROADCAST)
812                 result = broadcast_event(client, event, atomic, hop);
813         else if (event->dest.client >= SNDRV_SEQ_MAX_CLIENTS)
814                 result = multicast_event(client, event, atomic, hop);
815         else if (event->dest.port == SNDRV_SEQ_ADDRESS_BROADCAST)
816                 result = port_broadcast_event(client, event, atomic, hop);
817 #endif
818         else
819                 result = snd_seq_deliver_single_event(client, event, 0, atomic, hop);
820 
821         return result;
822 }
823 
824 /*
825  * dispatch an event cell:
826  * This function is called only from queue check routines in timer
827  * interrupts or after enqueued.
828  * The event cell shall be released or re-queued in this function.
829  *
830  * RETURN VALUE: n > 0  : the number of delivered events.
831  *               n == 0 : the event was not passed to any client.
832  *               n < 0  : error - event was not processed.
833  */
834 int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop)
835 {
836         struct snd_seq_client *client;
837         int result;
838 
839         if (snd_BUG_ON(!cell))
840                 return -EINVAL;
841 
842         client = snd_seq_client_use_ptr(cell->event.source.client);
843         if (client == NULL) {
844                 snd_seq_cell_free(cell); /* release this cell */
845                 return -EINVAL;
846         }
847 
848         if (cell->event.type == SNDRV_SEQ_EVENT_NOTE) {
849                 /* NOTE event:
850                  * the event cell is re-used as a NOTE-OFF event and
851                  * enqueued again.
852                  */
853                 struct snd_seq_event tmpev, *ev;
854 
855                 /* reserve this event to enqueue note-off later */
856                 tmpev = cell->event;
857                 tmpev.type = SNDRV_SEQ_EVENT_NOTEON;
858                 result = snd_seq_deliver_event(client, &tmpev, atomic, hop);
859 
860                 /*
861                  * This was originally a note event.  We now re-use the
862                  * cell for the note-off event.
863                  */
864 
865                 ev = &cell->event;
866                 ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
867                 ev->flags |= SNDRV_SEQ_PRIORITY_HIGH;
868 
869                 /* add the duration time */
870                 switch (ev->flags & SNDRV_SEQ_TIME_STAMP_MASK) {
871                 case SNDRV_SEQ_TIME_STAMP_TICK:
872                         ev->time.tick += ev->data.note.duration;
873                         break;
874                 case SNDRV_SEQ_TIME_STAMP_REAL:
875                         /* unit for duration is ms */
876                         ev->time.time.tv_nsec += 1000000 * (ev->data.note.duration % 1000);
877                         ev->time.time.tv_sec += ev->data.note.duration / 1000 +
878                                                 ev->time.time.tv_nsec / 1000000000;
879                         ev->time.time.tv_nsec %= 1000000000;
880                         break;
881                 }
882                 ev->data.note.velocity = ev->data.note.off_velocity;
883 
884                 /* Now queue this cell as the note off event */
885                 if (snd_seq_enqueue_event(cell, atomic, hop) < 0)
886                         snd_seq_cell_free(cell); /* release this cell */
887 
888         } else {
889                 /* Normal events:
890                  * event cell is freed after processing the event
891                  */
892 
893                 result = snd_seq_deliver_event(client, &cell->event, atomic, hop);
894                 snd_seq_cell_free(cell);
895         }
896 
897         snd_seq_client_unlock(client);
898         return result;
899 }
900 
901 
902 /* Allocate a cell from client pool and enqueue it to queue:
903  * if pool is empty and blocking is TRUE, sleep until a new cell is
904  * available.
905  */
906 static int snd_seq_client_enqueue_event(struct snd_seq_client *client,
907                                         struct snd_seq_event *event,
908                                         struct file *file, int blocking,
909                                         int atomic, int hop)
910 {
911         struct snd_seq_event_cell *cell;
912         int err;
913 
914         /* special queue values - force direct passing */
915         if (event->queue == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
916                 event->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS;
917                 event->queue = SNDRV_SEQ_QUEUE_DIRECT;
918         } else
919 #ifdef SUPPORT_BROADCAST
920                 if (event->queue == SNDRV_SEQ_ADDRESS_BROADCAST) {
921                         event->dest.client = SNDRV_SEQ_ADDRESS_BROADCAST;
922                         event->queue = SNDRV_SEQ_QUEUE_DIRECT;
923                 }
924 #endif
925         if (event->dest.client == SNDRV_SEQ_ADDRESS_SUBSCRIBERS) {
926                 /* check presence of source port */
927                 struct snd_seq_client_port *src_port = snd_seq_port_use_ptr(client, event->source.port);
928                 if (src_port == NULL)
929                         return -EINVAL;
930                 snd_seq_port_unlock(src_port);
931         }
932 
933         /* direct event processing without enqueued */
934         if (snd_seq_ev_is_direct(event)) {
935                 if (event->type == SNDRV_SEQ_EVENT_NOTE)
936                         return -EINVAL; /* this event must be enqueued! */
937                 return snd_seq_deliver_event(client, event, atomic, hop);
938         }
939 
940         /* Not direct, normal queuing */
941         if (snd_seq_queue_is_used(event->queue, client->number) <= 0)
942                 return -EINVAL;  /* invalid queue */
943         if (! snd_seq_write_pool_allocated(client))
944                 return -ENXIO; /* queue is not allocated */
945 
946         /* allocate an event cell */
947         err = snd_seq_event_dup(client->pool, event, &cell, !blocking || atomic, file);
948         if (err < 0)
949                 return err;
950 
951         /* we got a cell. enqueue it. */
952         if ((err = snd_seq_enqueue_event(cell, atomic, hop)) < 0) {
953                 snd_seq_cell_free(cell);
954                 return err;
955         }
956 
957         return 0;
958 }
959 
960 
961 /*
962  * check validity of event type and data length.
963  * return non-zero if invalid.
964  */
965 static int check_event_type_and_length(struct snd_seq_event *ev)
966 {
967         switch (snd_seq_ev_length_type(ev)) {
968         case SNDRV_SEQ_EVENT_LENGTH_FIXED:
969                 if (snd_seq_ev_is_variable_type(ev))
970                         return -EINVAL;
971                 break;
972         case SNDRV_SEQ_EVENT_LENGTH_VARIABLE:
973                 if (! snd_seq_ev_is_variable_type(ev) ||
974                     (ev->data.ext.len & ~SNDRV_SEQ_EXT_MASK) >= SNDRV_SEQ_MAX_EVENT_LEN)
975                         return -EINVAL;
976                 break;
977         case SNDRV_SEQ_EVENT_LENGTH_VARUSR:
978                 if (! snd_seq_ev_is_direct(ev))
979                         return -EINVAL;
980                 break;
981         }
982         return 0;
983 }
984 
985 
986 /* handle write() */
987 /* possible error values:
988  *      -ENXIO  invalid client or file open mode
989  *      -ENOMEM malloc failed
990  *      -EFAULT seg. fault during copy from user space
991  *      -EINVAL invalid event
992  *      -EAGAIN no space in output pool
993  *      -EINTR  interrupts while sleep
994  *      -EMLINK too many hops
995  *      others  depends on return value from driver callback
996  */
997 static ssize_t snd_seq_write(struct file *file, const char __user *buf,
998                              size_t count, loff_t *offset)
999 {
1000         struct snd_seq_client *client = file->private_data;
1001         int written = 0, len;
1002         int err = -EINVAL;
1003         struct snd_seq_event event;
1004 
1005         if (!(snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT))
1006                 return -ENXIO;
1007 
1008         /* check client structures are in place */
1009         if (snd_BUG_ON(!client))
1010                 return -ENXIO;
1011                 
1012         if (!client->accept_output || client->pool == NULL)
1013                 return -ENXIO;
1014 
1015         /* allocate the pool now if the pool is not allocated yet */ 
1016         if (client->pool->size > 0 && !snd_seq_write_pool_allocated(client)) {
1017                 if (snd_seq_pool_init(client->pool) < 0)
1018                         return -ENOMEM;
1019         }
1020 
1021         /* only process whole events */
1022         while (count >= sizeof(struct snd_seq_event)) {
1023                 /* Read in the event header from the user */
1024                 len = sizeof(event);
1025                 if (copy_from_user(&event, buf, len)) {
1026                         err = -EFAULT;
1027                         break;
1028                 }
1029                 event.source.client = client->number;   /* fill in client number */
1030                 /* Check for extension data length */
1031                 if (check_event_type_and_length(&event)) {
1032                         err = -EINVAL;
1033                         break;
1034                 }
1035 
1036                 /* check for special events */
1037                 if (event.type == SNDRV_SEQ_EVENT_NONE)
1038                         goto __skip_event;
1039                 else if (snd_seq_ev_is_reserved(&event)) {
1040                         err = -EINVAL;
1041                         break;
1042                 }
1043 
1044                 if (snd_seq_ev_is_variable(&event)) {
1045                         int extlen = event.data.ext.len & ~SNDRV_SEQ_EXT_MASK;
1046                         if ((size_t)(extlen + len) > count) {
1047                                 /* back out, will get an error this time or next */
1048                                 err = -EINVAL;
1049                                 break;
1050                         }
1051                         /* set user space pointer */
1052                         event.data.ext.len = extlen | SNDRV_SEQ_EXT_USRPTR;
1053                         event.data.ext.ptr = (char __force *)buf
1054                                                 + sizeof(struct snd_seq_event);
1055                         len += extlen; /* increment data length */
1056                 } else {
1057 #ifdef CONFIG_COMPAT
1058                         if (client->convert32 && snd_seq_ev_is_varusr(&event)) {
1059                                 void *ptr = (void __force *)compat_ptr(event.data.raw32.d[1]);
1060                                 event.data.ext.ptr = ptr;
1061                         }
1062 #endif
1063                 }
1064 
1065                 /* ok, enqueue it */
1066                 err = snd_seq_client_enqueue_event(client, &event, file,
1067                                                    !(file->f_flags & O_NONBLOCK),
1068                                                    0, 0);
1069                 if (err < 0)
1070                         break;
1071 
1072         __skip_event:
1073                 /* Update pointers and counts */
1074                 count -= len;
1075                 buf += len;
1076                 written += len;
1077         }
1078 
1079         return written ? written : err;
1080 }
1081 
1082 
1083 /*
1084  * handle polling
1085  */
1086 static unsigned int snd_seq_poll(struct file *file, poll_table * wait)
1087 {
1088         struct snd_seq_client *client = file->private_data;
1089         unsigned int mask = 0;
1090 
1091         /* check client structures are in place */
1092         if (snd_BUG_ON(!client))
1093                 return -ENXIO;
1094 
1095         if ((snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_INPUT) &&
1096             client->data.user.fifo) {
1097 
1098                 /* check if data is available in the outqueue */
1099                 if (snd_seq_fifo_poll_wait(client->data.user.fifo, file, wait))
1100                         mask |= POLLIN | POLLRDNORM;
1101         }
1102 
1103         if (snd_seq_file_flags(file) & SNDRV_SEQ_LFLG_OUTPUT) {
1104 
1105                 /* check if data is available in the pool */
1106                 if (!snd_seq_write_pool_allocated(client) ||
1107                     snd_seq_pool_poll_wait(client->pool, file, wait))
1108                         mask |= POLLOUT | POLLWRNORM;
1109         }
1110 
1111         return mask;
1112 }
1113 
1114 
1115 /*-----------------------------------------------------*/
1116 
1117 
1118 /* SYSTEM_INFO ioctl() */
1119 static int snd_seq_ioctl_system_info(struct snd_seq_client *client, void __user *arg)
1120 {
1121         struct snd_seq_system_info info;
1122 
1123         memset(&info, 0, sizeof(info));
1124         /* fill the info fields */
1125         info.queues = SNDRV_SEQ_MAX_QUEUES;
1126         info.clients = SNDRV_SEQ_MAX_CLIENTS;
1127         info.ports = 256;       /* fixed limit */
1128         info.channels = 256;    /* fixed limit */
1129         info.cur_clients = client_usage.cur;
1130         info.cur_queues = snd_seq_queue_get_cur_queues();
1131 
1132         if (copy_to_user(arg, &info, sizeof(info)))
1133                 return -EFAULT;
1134         return 0;
1135 }
1136 
1137 
1138 /* RUNNING_MODE ioctl() */
1139 static int snd_seq_ioctl_running_mode(struct snd_seq_client *client, void __user *arg)
1140 {
1141         struct snd_seq_running_info info;
1142         struct snd_seq_client *cptr;
1143         int err = 0;
1144 
1145         if (copy_from_user(&info, arg, sizeof(info)))
1146                 return -EFAULT;
1147 
1148         /* requested client number */
1149         cptr = snd_seq_client_use_ptr(info.client);
1150         if (cptr == NULL)
1151                 return -ENOENT;         /* don't change !!! */
1152 
1153 #ifdef SNDRV_BIG_ENDIAN
1154         if (! info.big_endian) {
1155                 err = -EINVAL;
1156                 goto __err;
1157         }
1158 #else
1159         if (info.big_endian) {
1160                 err = -EINVAL;
1161                 goto __err;
1162         }
1163 
1164 #endif
1165         if (info.cpu_mode > sizeof(long)) {
1166                 err = -EINVAL;
1167                 goto __err;
1168         }
1169         cptr->convert32 = (info.cpu_mode < sizeof(long));
1170  __err:
1171         snd_seq_client_unlock(cptr);
1172         return err;
1173 }
1174 
1175 /* CLIENT_INFO ioctl() */
1176 static void get_client_info(struct snd_seq_client *cptr,
1177                             struct snd_seq_client_info *info)
1178 {
1179         info->client = cptr->number;
1180 
1181         /* fill the info fields */
1182         info->type = cptr->type;
1183         strcpy(info->name, cptr->name);
1184         info->filter = cptr->filter;
1185         info->event_lost = cptr->event_lost;
1186         memcpy(info->event_filter, cptr->event_filter, 32);
1187         info->num_ports = cptr->num_ports;
1188         memset(info->reserved, 0, sizeof(info->reserved));
1189 }
1190 
1191 static int snd_seq_ioctl_get_client_info(struct snd_seq_client *client,
1192                                          void __user *arg)
1193 {
1194         struct snd_seq_client *cptr;
1195         struct snd_seq_client_info client_info;
1196 
1197         if (copy_from_user(&client_info, arg, sizeof(client_info)))
1198                 return -EFAULT;
1199 
1200         /* requested client number */
1201         cptr = snd_seq_client_use_ptr(client_info.client);
1202         if (cptr == NULL)
1203                 return -ENOENT;         /* don't change !!! */
1204 
1205         get_client_info(cptr, &client_info);
1206         snd_seq_client_unlock(cptr);
1207 
1208         if (copy_to_user(arg, &client_info, sizeof(client_info)))
1209                 return -EFAULT;
1210         return 0;
1211 }
1212 
1213 
1214 /* CLIENT_INFO ioctl() */
1215 static int snd_seq_ioctl_set_client_info(struct snd_seq_client *client,
1216                                          void __user *arg)
1217 {
1218         struct snd_seq_client_info client_info;
1219 
1220         if (copy_from_user(&client_info, arg, sizeof(client_info)))
1221                 return -EFAULT;
1222 
1223         /* it is not allowed to set the info fields for an another client */
1224         if (client->number != client_info.client)
1225                 return -EPERM;
1226         /* also client type must be set now */
1227         if (client->type != client_info.type)
1228                 return -EINVAL;
1229 
1230         /* fill the info fields */
1231         if (client_info.name[0])
1232                 strlcpy(client->name, client_info.name, sizeof(client->name));
1233 
1234         client->filter = client_info.filter;
1235         client->event_lost = client_info.event_lost;
1236         memcpy(client->event_filter, client_info.event_filter, 32);
1237 
1238         return 0;
1239 }
1240 
1241 
1242 /* 
1243  * CREATE PORT ioctl() 
1244  */
1245 static int snd_seq_ioctl_create_port(struct snd_seq_client *client,
1246                                      void __user *arg)
1247 {
1248         struct snd_seq_client_port *port;
1249         struct snd_seq_port_info info;
1250         struct snd_seq_port_callback *callback;
1251 
1252         if (copy_from_user(&info, arg, sizeof(info)))
1253                 return -EFAULT;
1254 
1255         /* it is not allowed to create the port for an another client */
1256         if (info.addr.client != client->number)
1257                 return -EPERM;
1258 
1259         port = snd_seq_create_port(client, (info.flags & SNDRV_SEQ_PORT_FLG_GIVEN_PORT) ? info.addr.port : -1);
1260         if (port == NULL)
1261                 return -ENOMEM;
1262 
1263         if (client->type == USER_CLIENT && info.kernel) {
1264                 snd_seq_delete_port(client, port->addr.port);
1265                 return -EINVAL;
1266         }
1267         if (client->type == KERNEL_CLIENT) {
1268                 if ((callback = info.kernel) != NULL) {
1269                         if (callback->owner)
1270                                 port->owner = callback->owner;
1271                         port->private_data = callback->private_data;
1272                         port->private_free = callback->private_free;
1273                         port->callback_all = callback->callback_all;
1274                         port->event_input = callback->event_input;
1275                         port->c_src.open = callback->subscribe;
1276                         port->c_src.close = callback->unsubscribe;
1277                         port->c_dest.open = callback->use;
1278                         port->c_dest.close = callback->unuse;
1279                 }
1280         }
1281 
1282         info.addr = port->addr;
1283 
1284         snd_seq_set_port_info(port, &info);
1285         snd_seq_system_client_ev_port_start(port->addr.client, port->addr.port);
1286 
1287         if (copy_to_user(arg, &info, sizeof(info)))
1288                 return -EFAULT;
1289 
1290         return 0;
1291 }
1292 
1293 /* 
1294  * DELETE PORT ioctl() 
1295  */
1296 static int snd_seq_ioctl_delete_port(struct snd_seq_client *client,
1297                                      void __user *arg)
1298 {
1299         struct snd_seq_port_info info;
1300         int err;
1301 
1302         /* set passed parameters */
1303         if (copy_from_user(&info, arg, sizeof(info)))
1304                 return -EFAULT;
1305         
1306         /* it is not allowed to remove the port for an another client */
1307         if (info.addr.client != client->number)
1308                 return -EPERM;
1309 
1310         err = snd_seq_delete_port(client, info.addr.port);
1311         if (err >= 0)
1312                 snd_seq_system_client_ev_port_exit(client->number, info.addr.port);
1313         return err;
1314 }
1315 
1316 
1317 /* 
1318  * GET_PORT_INFO ioctl() (on any client) 
1319  */
1320 static int snd_seq_ioctl_get_port_info(struct snd_seq_client *client,
1321                                        void __user *arg)
1322 {
1323         struct snd_seq_client *cptr;
1324         struct snd_seq_client_port *port;
1325         struct snd_seq_port_info info;
1326 
1327         if (copy_from_user(&info, arg, sizeof(info)))
1328                 return -EFAULT;
1329         cptr = snd_seq_client_use_ptr(info.addr.client);
1330         if (cptr == NULL)
1331                 return -ENXIO;
1332 
1333         port = snd_seq_port_use_ptr(cptr, info.addr.port);
1334         if (port == NULL) {
1335                 snd_seq_client_unlock(cptr);
1336                 return -ENOENT;                 /* don't change */
1337         }
1338 
1339         /* get port info */
1340         snd_seq_get_port_info(port, &info);
1341         snd_seq_port_unlock(port);
1342         snd_seq_client_unlock(cptr);
1343 
1344         if (copy_to_user(arg, &info, sizeof(info)))
1345                 return -EFAULT;
1346         return 0;
1347 }
1348 
1349 
1350 /* 
1351  * SET_PORT_INFO ioctl() (only ports on this/own client) 
1352  */
1353 static int snd_seq_ioctl_set_port_info(struct snd_seq_client *client,
1354                                        void __user *arg)
1355 {
1356         struct snd_seq_client_port *port;
1357         struct snd_seq_port_info info;
1358 
1359         if (copy_from_user(&info, arg, sizeof(info)))
1360                 return -EFAULT;
1361 
1362         if (info.addr.client != client->number) /* only set our own ports ! */
1363                 return -EPERM;
1364         port = snd_seq_port_use_ptr(client, info.addr.port);
1365         if (port) {
1366                 snd_seq_set_port_info(port, &info);
1367                 snd_seq_port_unlock(port);
1368         }
1369         return 0;
1370 }
1371 
1372 
1373 /*
1374  * port subscription (connection)
1375  */
1376 #define PERM_RD         (SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ)
1377 #define PERM_WR         (SNDRV_SEQ_PORT_CAP_WRITE|SNDRV_SEQ_PORT_CAP_SUBS_WRITE)
1378 
1379 static int check_subscription_permission(struct snd_seq_client *client,
1380                                          struct snd_seq_client_port *sport,
1381                                          struct snd_seq_client_port *dport,
1382                                          struct snd_seq_port_subscribe *subs)
1383 {
1384         if (client->number != subs->sender.client &&
1385             client->number != subs->dest.client) {
1386                 /* connection by third client - check export permission */
1387                 if (check_port_perm(sport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1388                         return -EPERM;
1389                 if (check_port_perm(dport, SNDRV_SEQ_PORT_CAP_NO_EXPORT))
1390                         return -EPERM;
1391         }
1392 
1393         /* check read permission */
1394         /* if sender or receiver is the subscribing client itself,
1395          * no permission check is necessary
1396          */
1397         if (client->number != subs->sender.client) {
1398                 if (! check_port_perm(sport, PERM_RD))
1399                         return -EPERM;
1400         }
1401         /* check write permission */
1402         if (client->number != subs->dest.client) {
1403                 if (! check_port_perm(dport, PERM_WR))
1404                         return -EPERM;
1405         }
1406         return 0;
1407 }
1408 
1409 /*
1410  * send an subscription notify event to user client:
1411  * client must be user client.
1412  */
1413 int snd_seq_client_notify_subscription(int client, int port,
1414                                        struct snd_seq_port_subscribe *info,
1415                                        int evtype)
1416 {
1417         struct snd_seq_event event;
1418 
1419         memset(&event, 0, sizeof(event));
1420         event.type = evtype;
1421         event.data.connect.dest = info->dest;
1422         event.data.connect.sender = info->sender;
1423 
1424         return snd_seq_system_notify(client, port, &event);  /* non-atomic */
1425 }
1426 
1427 
1428 /* 
1429  * add to port's subscription list IOCTL interface 
1430  */
1431 static int snd_seq_ioctl_subscribe_port(struct snd_seq_client *client,
1432                                         void __user *arg)
1433 {
1434         int result = -EINVAL;
1435         struct snd_seq_client *receiver = NULL, *sender = NULL;
1436         struct snd_seq_client_port *sport = NULL, *dport = NULL;
1437         struct snd_seq_port_subscribe subs;
1438 
1439         if (copy_from_user(&subs, arg, sizeof(subs)))
1440                 return -EFAULT;
1441 
1442         if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1443                 goto __end;
1444         if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1445                 goto __end;
1446         if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1447                 goto __end;
1448         if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1449                 goto __end;
1450 
1451         result = check_subscription_permission(client, sport, dport, &subs);
1452         if (result < 0)
1453                 goto __end;
1454 
1455         /* connect them */
1456         result = snd_seq_port_connect(client, sender, sport, receiver, dport, &subs);
1457         if (! result) /* broadcast announce */
1458                 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1459                                                    &subs, SNDRV_SEQ_EVENT_PORT_SUBSCRIBED);
1460       __end:
1461         if (sport)
1462                 snd_seq_port_unlock(sport);
1463         if (dport)
1464                 snd_seq_port_unlock(dport);
1465         if (sender)
1466                 snd_seq_client_unlock(sender);
1467         if (receiver)
1468                 snd_seq_client_unlock(receiver);
1469         return result;
1470 }
1471 
1472 
1473 /* 
1474  * remove from port's subscription list 
1475  */
1476 static int snd_seq_ioctl_unsubscribe_port(struct snd_seq_client *client,
1477                                           void __user *arg)
1478 {
1479         int result = -ENXIO;
1480         struct snd_seq_client *receiver = NULL, *sender = NULL;
1481         struct snd_seq_client_port *sport = NULL, *dport = NULL;
1482         struct snd_seq_port_subscribe subs;
1483 
1484         if (copy_from_user(&subs, arg, sizeof(subs)))
1485                 return -EFAULT;
1486 
1487         if ((receiver = snd_seq_client_use_ptr(subs.dest.client)) == NULL)
1488                 goto __end;
1489         if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1490                 goto __end;
1491         if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1492                 goto __end;
1493         if ((dport = snd_seq_port_use_ptr(receiver, subs.dest.port)) == NULL)
1494                 goto __end;
1495 
1496         result = check_subscription_permission(client, sport, dport, &subs);
1497         if (result < 0)
1498                 goto __end;
1499 
1500         result = snd_seq_port_disconnect(client, sender, sport, receiver, dport, &subs);
1501         if (! result) /* broadcast announce */
1502                 snd_seq_client_notify_subscription(SNDRV_SEQ_ADDRESS_SUBSCRIBERS, 0,
1503                                                    &subs, SNDRV_SEQ_EVENT_PORT_UNSUBSCRIBED);
1504       __end:
1505         if (sport)
1506                 snd_seq_port_unlock(sport);
1507         if (dport)
1508                 snd_seq_port_unlock(dport);
1509         if (sender)
1510                 snd_seq_client_unlock(sender);
1511         if (receiver)
1512                 snd_seq_client_unlock(receiver);
1513         return result;
1514 }
1515 
1516 
1517 /* CREATE_QUEUE ioctl() */
1518 static int snd_seq_ioctl_create_queue(struct snd_seq_client *client,
1519                                       void __user *arg)
1520 {
1521         struct snd_seq_queue_info info;
1522         int result;
1523         struct snd_seq_queue *q;
1524 
1525         if (copy_from_user(&info, arg, sizeof(info)))
1526                 return -EFAULT;
1527 
1528         result = snd_seq_queue_alloc(client->number, info.locked, info.flags);
1529         if (result < 0)
1530                 return result;
1531 
1532         q = queueptr(result);
1533         if (q == NULL)
1534                 return -EINVAL;
1535 
1536         info.queue = q->queue;
1537         info.locked = q->locked;
1538         info.owner = q->owner;
1539 
1540         /* set queue name */
1541         if (! info.name[0])
1542                 snprintf(info.name, sizeof(info.name), "Queue-%d", q->queue);
1543         strlcpy(q->name, info.name, sizeof(q->name));
1544         queuefree(q);
1545 
1546         if (copy_to_user(arg, &info, sizeof(info)))
1547                 return -EFAULT;
1548 
1549         return 0;
1550 }
1551 
1552 /* DELETE_QUEUE ioctl() */
1553 static int snd_seq_ioctl_delete_queue(struct snd_seq_client *client,
1554                                       void __user *arg)
1555 {
1556         struct snd_seq_queue_info info;
1557 
1558         if (copy_from_user(&info, arg, sizeof(info)))
1559                 return -EFAULT;
1560 
1561         return snd_seq_queue_delete(client->number, info.queue);
1562 }
1563 
1564 /* GET_QUEUE_INFO ioctl() */
1565 static int snd_seq_ioctl_get_queue_info(struct snd_seq_client *client,
1566                                         void __user *arg)
1567 {
1568         struct snd_seq_queue_info info;
1569         struct snd_seq_queue *q;
1570 
1571         if (copy_from_user(&info, arg, sizeof(info)))
1572                 return -EFAULT;
1573 
1574         q = queueptr(info.queue);
1575         if (q == NULL)
1576                 return -EINVAL;
1577 
1578         memset(&info, 0, sizeof(info));
1579         info.queue = q->queue;
1580         info.owner = q->owner;
1581         info.locked = q->locked;
1582         strlcpy(info.name, q->name, sizeof(info.name));
1583         queuefree(q);
1584 
1585         if (copy_to_user(arg, &info, sizeof(info)))
1586                 return -EFAULT;
1587 
1588         return 0;
1589 }
1590 
1591 /* SET_QUEUE_INFO ioctl() */
1592 static int snd_seq_ioctl_set_queue_info(struct snd_seq_client *client,
1593                                         void __user *arg)
1594 {
1595         struct snd_seq_queue_info info;
1596         struct snd_seq_queue *q;
1597 
1598         if (copy_from_user(&info, arg, sizeof(info)))
1599                 return -EFAULT;
1600 
1601         if (info.owner != client->number)
1602                 return -EINVAL;
1603 
1604         /* change owner/locked permission */
1605         if (snd_seq_queue_check_access(info.queue, client->number)) {
1606                 if (snd_seq_queue_set_owner(info.queue, client->number, info.locked) < 0)
1607                         return -EPERM;
1608                 if (info.locked)
1609                         snd_seq_queue_use(info.queue, client->number, 1);
1610         } else {
1611                 return -EPERM;
1612         }       
1613 
1614         q = queueptr(info.queue);
1615         if (! q)
1616                 return -EINVAL;
1617         if (q->owner != client->number) {
1618                 queuefree(q);
1619                 return -EPERM;
1620         }
1621         strlcpy(q->name, info.name, sizeof(q->name));
1622         queuefree(q);
1623 
1624         return 0;
1625 }
1626 
1627 /* GET_NAMED_QUEUE ioctl() */
1628 static int snd_seq_ioctl_get_named_queue(struct snd_seq_client *client, void __user *arg)
1629 {
1630         struct snd_seq_queue_info info;
1631         struct snd_seq_queue *q;
1632 
1633         if (copy_from_user(&info, arg, sizeof(info)))
1634                 return -EFAULT;
1635 
1636         q = snd_seq_queue_find_name(info.name);
1637         if (q == NULL)
1638                 return -EINVAL;
1639         info.queue = q->queue;
1640         info.owner = q->owner;
1641         info.locked = q->locked;
1642         queuefree(q);
1643 
1644         if (copy_to_user(arg, &info, sizeof(info)))
1645                 return -EFAULT;
1646 
1647         return 0;
1648 }
1649 
1650 /* GET_QUEUE_STATUS ioctl() */
1651 static int snd_seq_ioctl_get_queue_status(struct snd_seq_client *client,
1652                                           void __user *arg)
1653 {
1654         struct snd_seq_queue_status status;
1655         struct snd_seq_queue *queue;
1656         struct snd_seq_timer *tmr;
1657 
1658         if (copy_from_user(&status, arg, sizeof(status)))
1659                 return -EFAULT;
1660 
1661         queue = queueptr(status.queue);
1662         if (queue == NULL)
1663                 return -EINVAL;
1664         memset(&status, 0, sizeof(status));
1665         status.queue = queue->queue;
1666         
1667         tmr = queue->timer;
1668         status.events = queue->tickq->cells + queue->timeq->cells;
1669 
1670         status.time = snd_seq_timer_get_cur_time(tmr);
1671         status.tick = snd_seq_timer_get_cur_tick(tmr);
1672 
1673         status.running = tmr->running;
1674 
1675         status.flags = queue->flags;
1676         queuefree(queue);
1677 
1678         if (copy_to_user(arg, &status, sizeof(status)))
1679                 return -EFAULT;
1680         return 0;
1681 }
1682 
1683 
1684 /* GET_QUEUE_TEMPO ioctl() */
1685 static int snd_seq_ioctl_get_queue_tempo(struct snd_seq_client *client,
1686                                          void __user *arg)
1687 {
1688         struct snd_seq_queue_tempo tempo;
1689         struct snd_seq_queue *queue;
1690         struct snd_seq_timer *tmr;
1691 
1692         if (copy_from_user(&tempo, arg, sizeof(tempo)))
1693                 return -EFAULT;
1694 
1695         queue = queueptr(tempo.queue);
1696         if (queue == NULL)
1697                 return -EINVAL;
1698         memset(&tempo, 0, sizeof(tempo));
1699         tempo.queue = queue->queue;
1700         
1701         tmr = queue->timer;
1702 
1703         tempo.tempo = tmr->tempo;
1704         tempo.ppq = tmr->ppq;
1705         tempo.skew_value = tmr->skew;
1706         tempo.skew_base = tmr->skew_base;
1707         queuefree(queue);
1708 
1709         if (copy_to_user(arg, &tempo, sizeof(tempo)))
1710                 return -EFAULT;
1711         return 0;
1712 }
1713 
1714 
1715 /* SET_QUEUE_TEMPO ioctl() */
1716 int snd_seq_set_queue_tempo(int client, struct snd_seq_queue_tempo *tempo)
1717 {
1718         if (!snd_seq_queue_check_access(tempo->queue, client))
1719                 return -EPERM;
1720         return snd_seq_queue_timer_set_tempo(tempo->queue, client, tempo);
1721 }
1722 
1723 EXPORT_SYMBOL(snd_seq_set_queue_tempo);
1724 
1725 static int snd_seq_ioctl_set_queue_tempo(struct snd_seq_client *client,
1726                                          void __user *arg)
1727 {
1728         int result;
1729         struct snd_seq_queue_tempo tempo;
1730 
1731         if (copy_from_user(&tempo, arg, sizeof(tempo)))
1732                 return -EFAULT;
1733 
1734         result = snd_seq_set_queue_tempo(client->number, &tempo);
1735         return result < 0 ? result : 0;
1736 }
1737 
1738 
1739 /* GET_QUEUE_TIMER ioctl() */
1740 static int snd_seq_ioctl_get_queue_timer(struct snd_seq_client *client,
1741                                          void __user *arg)
1742 {
1743         struct snd_seq_queue_timer timer;
1744         struct snd_seq_queue *queue;
1745         struct snd_seq_timer *tmr;
1746 
1747         if (copy_from_user(&timer, arg, sizeof(timer)))
1748                 return -EFAULT;
1749 
1750         queue = queueptr(timer.queue);
1751         if (queue == NULL)
1752                 return -EINVAL;
1753 
1754         if (mutex_lock_interruptible(&queue->timer_mutex)) {
1755                 queuefree(queue);
1756                 return -ERESTARTSYS;
1757         }
1758         tmr = queue->timer;
1759         memset(&timer, 0, sizeof(timer));
1760         timer.queue = queue->queue;
1761 
1762         timer.type = tmr->type;
1763         if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1764                 timer.u.alsa.id = tmr->alsa_id;
1765                 timer.u.alsa.resolution = tmr->preferred_resolution;
1766         }
1767         mutex_unlock(&queue->timer_mutex);
1768         queuefree(queue);
1769         
1770         if (copy_to_user(arg, &timer, sizeof(timer)))
1771                 return -EFAULT;
1772         return 0;
1773 }
1774 
1775 
1776 /* SET_QUEUE_TIMER ioctl() */
1777 static int snd_seq_ioctl_set_queue_timer(struct snd_seq_client *client,
1778                                          void __user *arg)
1779 {
1780         int result = 0;
1781         struct snd_seq_queue_timer timer;
1782 
1783         if (copy_from_user(&timer, arg, sizeof(timer)))
1784                 return -EFAULT;
1785 
1786         if (timer.type != SNDRV_SEQ_TIMER_ALSA)
1787                 return -EINVAL;
1788 
1789         if (snd_seq_queue_check_access(timer.queue, client->number)) {
1790                 struct snd_seq_queue *q;
1791                 struct snd_seq_timer *tmr;
1792 
1793                 q = queueptr(timer.queue);
1794                 if (q == NULL)
1795                         return -ENXIO;
1796                 if (mutex_lock_interruptible(&q->timer_mutex)) {
1797                         queuefree(q);
1798                         return -ERESTARTSYS;
1799                 }
1800                 tmr = q->timer;
1801                 snd_seq_queue_timer_close(timer.queue);
1802                 tmr->type = timer.type;
1803                 if (tmr->type == SNDRV_SEQ_TIMER_ALSA) {
1804                         tmr->alsa_id = timer.u.alsa.id;
1805                         tmr->preferred_resolution = timer.u.alsa.resolution;
1806                 }
1807                 result = snd_seq_queue_timer_open(timer.queue);
1808                 mutex_unlock(&q->timer_mutex);
1809                 queuefree(q);
1810         } else {
1811                 return -EPERM;
1812         }       
1813 
1814         return result;
1815 }
1816 
1817 
1818 /* GET_QUEUE_CLIENT ioctl() */
1819 static int snd_seq_ioctl_get_queue_client(struct snd_seq_client *client,
1820                                           void __user *arg)
1821 {
1822         struct snd_seq_queue_client info;
1823         int used;
1824 
1825         if (copy_from_user(&info, arg, sizeof(info)))
1826                 return -EFAULT;
1827 
1828         used = snd_seq_queue_is_used(info.queue, client->number);
1829         if (used < 0)
1830                 return -EINVAL;
1831         info.used = used;
1832         info.client = client->number;
1833 
1834         if (copy_to_user(arg, &info, sizeof(info)))
1835                 return -EFAULT;
1836         return 0;
1837 }
1838 
1839 
1840 /* SET_QUEUE_CLIENT ioctl() */
1841 static int snd_seq_ioctl_set_queue_client(struct snd_seq_client *client,
1842                                           void __user *arg)
1843 {
1844         int err;
1845         struct snd_seq_queue_client info;
1846 
1847         if (copy_from_user(&info, arg, sizeof(info)))
1848                 return -EFAULT;
1849 
1850         if (info.used >= 0) {
1851                 err = snd_seq_queue_use(info.queue, client->number, info.used);
1852                 if (err < 0)
1853                         return err;
1854         }
1855 
1856         return snd_seq_ioctl_get_queue_client(client, arg);
1857 }
1858 
1859 
1860 /* GET_CLIENT_POOL ioctl() */
1861 static int snd_seq_ioctl_get_client_pool(struct snd_seq_client *client,
1862                                          void __user *arg)
1863 {
1864         struct snd_seq_client_pool info;
1865         struct snd_seq_client *cptr;
1866 
1867         if (copy_from_user(&info, arg, sizeof(info)))
1868                 return -EFAULT;
1869 
1870         cptr = snd_seq_client_use_ptr(info.client);
1871         if (cptr == NULL)
1872                 return -ENOENT;
1873         memset(&info, 0, sizeof(info));
1874         info.output_pool = cptr->pool->size;
1875         info.output_room = cptr->pool->room;
1876         info.output_free = info.output_pool;
1877         info.output_free = snd_seq_unused_cells(cptr->pool);
1878         if (cptr->type == USER_CLIENT) {
1879                 info.input_pool = cptr->data.user.fifo_pool_size;
1880                 info.input_free = info.input_pool;
1881                 if (cptr->data.user.fifo)
1882                         info.input_free = snd_seq_unused_cells(cptr->data.user.fifo->pool);
1883         } else {
1884                 info.input_pool = 0;
1885                 info.input_free = 0;
1886         }
1887         snd_seq_client_unlock(cptr);
1888         
1889         if (copy_to_user(arg, &info, sizeof(info)))
1890                 return -EFAULT;
1891         return 0;
1892 }
1893 
1894 /* SET_CLIENT_POOL ioctl() */
1895 static int snd_seq_ioctl_set_client_pool(struct snd_seq_client *client,
1896                                          void __user *arg)
1897 {
1898         struct snd_seq_client_pool info;
1899         int rc;
1900 
1901         if (copy_from_user(&info, arg, sizeof(info)))
1902                 return -EFAULT;
1903 
1904         if (client->number != info.client)
1905                 return -EINVAL; /* can't change other clients */
1906 
1907         if (info.output_pool >= 1 && info.output_pool <= SNDRV_SEQ_MAX_EVENTS &&
1908             (! snd_seq_write_pool_allocated(client) ||
1909              info.output_pool != client->pool->size)) {
1910                 if (snd_seq_write_pool_allocated(client)) {
1911                         /* remove all existing cells */
1912                         snd_seq_pool_mark_closing(client->pool);
1913                         snd_seq_queue_client_leave_cells(client->number);
1914                         snd_seq_pool_done(client->pool);
1915                 }
1916                 client->pool->size = info.output_pool;
1917                 rc = snd_seq_pool_init(client->pool);
1918                 if (rc < 0)
1919                         return rc;
1920         }
1921         if (client->type == USER_CLIENT && client->data.user.fifo != NULL &&
1922             info.input_pool >= 1 &&
1923             info.input_pool <= SNDRV_SEQ_MAX_CLIENT_EVENTS &&
1924             info.input_pool != client->data.user.fifo_pool_size) {
1925                 /* change pool size */
1926                 rc = snd_seq_fifo_resize(client->data.user.fifo, info.input_pool);
1927                 if (rc < 0)
1928                         return rc;
1929                 client->data.user.fifo_pool_size = info.input_pool;
1930         }
1931         if (info.output_room >= 1 &&
1932             info.output_room <= client->pool->size) {
1933                 client->pool->room  = info.output_room;
1934         }
1935 
1936         return snd_seq_ioctl_get_client_pool(client, arg);
1937 }
1938 
1939 
1940 /* REMOVE_EVENTS ioctl() */
1941 static int snd_seq_ioctl_remove_events(struct snd_seq_client *client,
1942                                        void __user *arg)
1943 {
1944         struct snd_seq_remove_events info;
1945 
1946         if (copy_from_user(&info, arg, sizeof(info)))
1947                 return -EFAULT;
1948 
1949         /*
1950          * Input mostly not implemented XXX.
1951          */
1952         if (info.remove_mode & SNDRV_SEQ_REMOVE_INPUT) {
1953                 /*
1954                  * No restrictions so for a user client we can clear
1955                  * the whole fifo
1956                  */
1957                 if (client->type == USER_CLIENT && client->data.user.fifo)
1958                         snd_seq_fifo_clear(client->data.user.fifo);
1959         }
1960 
1961         if (info.remove_mode & SNDRV_SEQ_REMOVE_OUTPUT)
1962                 snd_seq_queue_remove_cells(client->number, &info);
1963 
1964         return 0;
1965 }
1966 
1967 
1968 /*
1969  * get subscription info
1970  */
1971 static int snd_seq_ioctl_get_subscription(struct snd_seq_client *client,
1972                                           void __user *arg)
1973 {
1974         int result;
1975         struct snd_seq_client *sender = NULL;
1976         struct snd_seq_client_port *sport = NULL;
1977         struct snd_seq_port_subscribe subs;
1978         struct snd_seq_subscribers *p;
1979 
1980         if (copy_from_user(&subs, arg, sizeof(subs)))
1981                 return -EFAULT;
1982 
1983         result = -EINVAL;
1984         if ((sender = snd_seq_client_use_ptr(subs.sender.client)) == NULL)
1985                 goto __end;
1986         if ((sport = snd_seq_port_use_ptr(sender, subs.sender.port)) == NULL)
1987                 goto __end;
1988         p = snd_seq_port_get_subscription(&sport->c_src, &subs.dest);
1989         if (p) {
1990                 result = 0;
1991                 subs = p->info;
1992         } else
1993                 result = -ENOENT;
1994 
1995       __end:
1996         if (sport)
1997                 snd_seq_port_unlock(sport);
1998         if (sender)
1999                 snd_seq_client_unlock(sender);
2000         if (result >= 0) {
2001                 if (copy_to_user(arg, &subs, sizeof(subs)))
2002                         return -EFAULT;
2003         }
2004         return result;
2005 }
2006 
2007 
2008 /*
2009  * get subscription info - check only its presence
2010  */
2011 static int snd_seq_ioctl_query_subs(struct snd_seq_client *client,
2012                                     void __user *arg)
2013 {
2014         int result = -ENXIO;
2015         struct snd_seq_client *cptr = NULL;
2016         struct snd_seq_client_port *port = NULL;
2017         struct snd_seq_query_subs subs;
2018         struct snd_seq_port_subs_info *group;
2019         struct list_head *p;
2020         int i;
2021 
2022         if (copy_from_user(&subs, arg, sizeof(subs)))
2023                 return -EFAULT;
2024 
2025         if ((cptr = snd_seq_client_use_ptr(subs.root.client)) == NULL)
2026                 goto __end;
2027         if ((port = snd_seq_port_use_ptr(cptr, subs.root.port)) == NULL)
2028                 goto __end;
2029 
2030         switch (subs.type) {
2031         case SNDRV_SEQ_QUERY_SUBS_READ:
2032                 group = &port->c_src;
2033                 break;
2034         case SNDRV_SEQ_QUERY_SUBS_WRITE:
2035                 group = &port->c_dest;
2036                 break;
2037         default:
2038                 goto __end;
2039         }
2040 
2041         down_read(&group->list_mutex);
2042         /* search for the subscriber */
2043         subs.num_subs = group->count;
2044         i = 0;
2045         result = -ENOENT;
2046         list_for_each(p, &group->list_head) {
2047                 if (i++ == subs.index) {
2048                         /* found! */
2049                         struct snd_seq_subscribers *s;
2050                         if (subs.type == SNDRV_SEQ_QUERY_SUBS_READ) {
2051                                 s = list_entry(p, struct snd_seq_subscribers, src_list);
2052                                 subs.addr = s->info.dest;
2053                         } else {
2054                                 s = list_entry(p, struct snd_seq_subscribers, dest_list);
2055                                 subs.addr = s->info.sender;
2056                         }
2057                         subs.flags = s->info.flags;
2058                         subs.queue = s->info.queue;
2059                         result = 0;
2060                         break;
2061                 }
2062         }
2063         up_read(&group->list_mutex);
2064 
2065       __end:
2066         if (port)
2067                 snd_seq_port_unlock(port);
2068         if (cptr)
2069                 snd_seq_client_unlock(cptr);
2070         if (result >= 0) {
2071                 if (copy_to_user(arg, &subs, sizeof(subs)))
2072                         return -EFAULT;
2073         }
2074         return result;
2075 }
2076 
2077 
2078 /*
2079  * query next client
2080  */
2081 static int snd_seq_ioctl_query_next_client(struct snd_seq_client *client,
2082                                            void __user *arg)
2083 {
2084         struct snd_seq_client *cptr = NULL;
2085         struct snd_seq_client_info info;
2086 
2087         if (copy_from_user(&info, arg, sizeof(info)))
2088                 return -EFAULT;
2089 
2090         /* search for next client */
2091         info.client++;
2092         if (info.client < 0)
2093                 info.client = 0;
2094         for (; info.client < SNDRV_SEQ_MAX_CLIENTS; info.client++) {
2095                 cptr = snd_seq_client_use_ptr(info.client);
2096                 if (cptr)
2097                         break; /* found */
2098         }
2099         if (cptr == NULL)
2100                 return -ENOENT;
2101 
2102         get_client_info(cptr, &info);
2103         snd_seq_client_unlock(cptr);
2104 
2105         if (copy_to_user(arg, &info, sizeof(info)))
2106                 return -EFAULT;
2107         return 0;
2108 }
2109 
2110 /* 
2111  * query next port
2112  */
2113 static int snd_seq_ioctl_query_next_port(struct snd_seq_client *client,
2114                                          void __user *arg)
2115 {
2116         struct snd_seq_client *cptr;
2117         struct snd_seq_client_port *port = NULL;
2118         struct snd_seq_port_info info;
2119 
2120         if (copy_from_user(&info, arg, sizeof(info)))
2121                 return -EFAULT;
2122         cptr = snd_seq_client_use_ptr(info.addr.client);
2123         if (cptr == NULL)
2124                 return -ENXIO;
2125 
2126         /* search for next port */
2127         info.addr.port++;
2128         port = snd_seq_port_query_nearest(cptr, &info);
2129         if (port == NULL) {
2130                 snd_seq_client_unlock(cptr);
2131                 return -ENOENT;
2132         }
2133 
2134         /* get port info */
2135         info.addr = port->addr;
2136         snd_seq_get_port_info(port, &info);
2137         snd_seq_port_unlock(port);
2138         snd_seq_client_unlock(cptr);
2139 
2140         if (copy_to_user(arg, &info, sizeof(info)))
2141                 return -EFAULT;
2142         return 0;
2143 }
2144 
2145 /* -------------------------------------------------------- */
2146 
2147 static struct seq_ioctl_table {
2148         unsigned int cmd;
2149         int (*func)(struct snd_seq_client *client, void __user * arg);
2150 } ioctl_tables[] = {
2151         { SNDRV_SEQ_IOCTL_SYSTEM_INFO, snd_seq_ioctl_system_info },
2152         { SNDRV_SEQ_IOCTL_RUNNING_MODE, snd_seq_ioctl_running_mode },
2153         { SNDRV_SEQ_IOCTL_GET_CLIENT_INFO, snd_seq_ioctl_get_client_info },
2154         { SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, snd_seq_ioctl_set_client_info },
2155         { SNDRV_SEQ_IOCTL_CREATE_PORT, snd_seq_ioctl_create_port },
2156         { SNDRV_SEQ_IOCTL_DELETE_PORT, snd_seq_ioctl_delete_port },
2157         { SNDRV_SEQ_IOCTL_GET_PORT_INFO, snd_seq_ioctl_get_port_info },
2158         { SNDRV_SEQ_IOCTL_SET_PORT_INFO, snd_seq_ioctl_set_port_info },
2159         { SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, snd_seq_ioctl_subscribe_port },
2160         { SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT, snd_seq_ioctl_unsubscribe_port },
2161         { SNDRV_SEQ_IOCTL_CREATE_QUEUE, snd_seq_ioctl_create_queue },
2162         { SNDRV_SEQ_IOCTL_DELETE_QUEUE, snd_seq_ioctl_delete_queue },
2163         { SNDRV_SEQ_IOCTL_GET_QUEUE_INFO, snd_seq_ioctl_get_queue_info },
2164         { SNDRV_SEQ_IOCTL_SET_QUEUE_INFO, snd_seq_ioctl_set_queue_info },
2165         { SNDRV_SEQ_IOCTL_GET_NAMED_QUEUE, snd_seq_ioctl_get_named_queue },
2166         { SNDRV_SEQ_IOCTL_GET_QUEUE_STATUS, snd_seq_ioctl_get_queue_status },
2167         { SNDRV_SEQ_IOCTL_GET_QUEUE_TEMPO, snd_seq_ioctl_get_queue_tempo },
2168         { SNDRV_SEQ_IOCTL_SET_QUEUE_TEMPO, snd_seq_ioctl_set_queue_tempo },
2169         { SNDRV_SEQ_IOCTL_GET_QUEUE_TIMER, snd_seq_ioctl_get_queue_timer },
2170         { SNDRV_SEQ_IOCTL_SET_QUEUE_TIMER, snd_seq_ioctl_set_queue_timer },
2171         { SNDRV_SEQ_IOCTL_GET_QUEUE_CLIENT, snd_seq_ioctl_get_queue_client },
2172         { SNDRV_SEQ_IOCTL_SET_QUEUE_CLIENT, snd_seq_ioctl_set_queue_client },
2173         { SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, snd_seq_ioctl_get_client_pool },
2174         { SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, snd_seq_ioctl_set_client_pool },
2175         { SNDRV_SEQ_IOCTL_GET_SUBSCRIPTION, snd_seq_ioctl_get_subscription },
2176         { SNDRV_SEQ_IOCTL_QUERY_NEXT_CLIENT, snd_seq_ioctl_query_next_client },
2177         { SNDRV_SEQ_IOCTL_QUERY_NEXT_PORT, snd_seq_ioctl_query_next_port },
2178         { SNDRV_SEQ_IOCTL_REMOVE_EVENTS, snd_seq_ioctl_remove_events },
2179         { SNDRV_SEQ_IOCTL_QUERY_SUBS, snd_seq_ioctl_query_subs },
2180         { 0, NULL },
2181 };
2182 
2183 static int snd_seq_do_ioctl(struct snd_seq_client *client, unsigned int cmd,
2184                             void __user *arg)
2185 {
2186         struct seq_ioctl_table *p;
2187 
2188         switch (cmd) {
2189         case SNDRV_SEQ_IOCTL_PVERSION:
2190                 /* return sequencer version number */
2191                 return put_user(SNDRV_SEQ_VERSION, (int __user *)arg) ? -EFAULT : 0;
2192         case SNDRV_SEQ_IOCTL_CLIENT_ID:
2193                 /* return the id of this client */
2194                 return put_user(client->number, (int __user *)arg) ? -EFAULT : 0;
2195         }
2196 
2197         if (! arg)
2198                 return -EFAULT;
2199         for (p = ioctl_tables; p->cmd; p++) {
2200                 if (p->cmd == cmd)
2201                         return p->func(client, arg);
2202         }
2203         snd_printd("seq unknown ioctl() 0x%x (type='%c', number=0x%02x)\n",
2204                    cmd, _IOC_TYPE(cmd), _IOC_NR(cmd));
2205         return -ENOTTY;
2206 }
2207 
2208 
2209 static long snd_seq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
2210 {
2211         struct snd_seq_client *client = file->private_data;
2212 
2213         if (snd_BUG_ON(!client))
2214                 return -ENXIO;
2215                 
2216         return snd_seq_do_ioctl(client, cmd, (void __user *) arg);
2217 }
2218 
2219 #ifdef CONFIG_COMPAT
2220 #include "seq_compat.c"
2221 #else
2222 #define snd_seq_ioctl_compat    NULL
2223 #endif
2224 
2225 /* -------------------------------------------------------- */
2226 
2227 
2228 /* exported to kernel modules */
2229 int snd_seq_create_kernel_client(struct snd_card *card, int client_index,
2230                                  const char *name_fmt, ...)
2231 {
2232         struct snd_seq_client *client;
2233         va_list args;
2234 
2235         if (snd_BUG_ON(in_interrupt()))
2236                 return -EBUSY;
2237 
2238         if (card && client_index >= SNDRV_SEQ_CLIENTS_PER_CARD)
2239                 return -EINVAL;
2240         if (card == NULL && client_index >= SNDRV_SEQ_GLOBAL_CLIENTS)
2241                 return -EINVAL;
2242 
2243         if (mutex_lock_interruptible(&register_mutex))
2244                 return -ERESTARTSYS;
2245 
2246         if (card) {
2247                 client_index += SNDRV_SEQ_GLOBAL_CLIENTS
2248                         + card->number * SNDRV_SEQ_CLIENTS_PER_CARD;
2249                 if (client_index >= SNDRV_SEQ_DYNAMIC_CLIENTS_BEGIN)
2250                         client_index = -1;
2251         }
2252 
2253         /* empty write queue as default */
2254         client = seq_create_client1(client_index, 0);
2255         if (client == NULL) {
2256                 mutex_unlock(&register_mutex);
2257                 return -EBUSY;  /* failure code */
2258         }
2259         usage_alloc(&client_usage, 1);
2260 
2261         client->accept_input = 1;
2262         client->accept_output = 1;
2263                 
2264         va_start(args, name_fmt);
2265         vsnprintf(client->name, sizeof(client->name), name_fmt, args);
2266         va_end(args);
2267 
2268         client->type = KERNEL_CLIENT;
2269         mutex_unlock(&register_mutex);
2270 
2271         /* make others aware this new client */
2272         snd_seq_system_client_ev_client_start(client->number);
2273         
2274         /* return client number to caller */
2275         return client->number;
2276 }
2277 
2278 EXPORT_SYMBOL(snd_seq_create_kernel_client);
2279 
2280 /* exported to kernel modules */
2281 int snd_seq_delete_kernel_client(int client)
2282 {
2283         struct snd_seq_client *ptr;
2284 
2285         if (snd_BUG_ON(in_interrupt()))
2286                 return -EBUSY;
2287 
2288         ptr = clientptr(client);
2289         if (ptr == NULL)
2290                 return -EINVAL;
2291 
2292         seq_free_client(ptr);
2293         kfree(ptr);
2294         return 0;
2295 }
2296 
2297 EXPORT_SYMBOL(snd_seq_delete_kernel_client);
2298 
2299 /* skeleton to enqueue event, called from snd_seq_kernel_client_enqueue
2300  * and snd_seq_kernel_client_enqueue_blocking
2301  */
2302 static int kernel_client_enqueue(int client, struct snd_seq_event *ev,
2303                                  struct file *file, int blocking,
2304                                  int atomic, int hop)
2305 {
2306         struct snd_seq_client *cptr;
2307         int result;
2308 
2309         if (snd_BUG_ON(!ev))
2310                 return -EINVAL;
2311 
2312         if (ev->type == SNDRV_SEQ_EVENT_NONE)
2313                 return 0; /* ignore this */
2314         if (ev->type == SNDRV_SEQ_EVENT_KERNEL_ERROR)
2315                 return -EINVAL; /* quoted events can't be enqueued */
2316 
2317         /* fill in client number */
2318         ev->source.client = client;
2319 
2320         if (check_event_type_and_length(ev))
2321                 return -EINVAL;
2322 
2323         cptr = snd_seq_client_use_ptr(client);
2324         if (cptr == NULL)
2325                 return -EINVAL;
2326         
2327         if (! cptr->accept_output)
2328                 result = -EPERM;
2329         else /* send it */
2330                 result = snd_seq_client_enqueue_event(cptr, ev, file, blocking, atomic, hop);
2331 
2332         snd_seq_client_unlock(cptr);
2333         return result;
2334 }
2335 
2336 /*
2337  * exported, called by kernel clients to enqueue events (w/o blocking)
2338  *
2339  * RETURN VALUE: zero if succeed, negative if error
2340  */
2341 int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event * ev,
2342                                   int atomic, int hop)
2343 {
2344         return kernel_client_enqueue(client, ev, NULL, 0, atomic, hop);
2345 }
2346 
2347 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue);
2348 
2349 /*
2350  * exported, called by kernel clients to enqueue events (with blocking)
2351  *
2352  * RETURN VALUE: zero if succeed, negative if error
2353  */
2354 int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev,
2355                                            struct file *file,
2356                                            int atomic, int hop)
2357 {
2358         return kernel_client_enqueue(client, ev, file, 1, atomic, hop);
2359 }
2360 
2361 EXPORT_SYMBOL(snd_seq_kernel_client_enqueue_blocking);
2362 
2363 /* 
2364  * exported, called by kernel clients to dispatch events directly to other
2365  * clients, bypassing the queues.  Event time-stamp will be updated.
2366  *
2367  * RETURN VALUE: negative = delivery failed,
2368  *               zero, or positive: the number of delivered events
2369  */
2370 int snd_seq_kernel_client_dispatch(int client, struct snd_seq_event * ev,
2371                                    int atomic, int hop)
2372 {
2373         struct snd_seq_client *cptr;
2374         int result;
2375 
2376         if (snd_BUG_ON(!ev))
2377                 return -EINVAL;
2378 
2379         /* fill in client number */
2380         ev->queue = SNDRV_SEQ_QUEUE_DIRECT;
2381         ev->source.client = client;
2382 
2383         if (check_event_type_and_length(ev))
2384                 return -EINVAL;
2385 
2386         cptr = snd_seq_client_use_ptr(client);
2387         if (cptr == NULL)
2388                 return -EINVAL;
2389 
2390         if (!cptr->accept_output)
2391                 result = -EPERM;
2392         else
2393                 result = snd_seq_deliver_event(cptr, ev, atomic, hop);
2394 
2395         snd_seq_client_unlock(cptr);
2396         return result;
2397 }
2398 
2399 EXPORT_SYMBOL(snd_seq_kernel_client_dispatch);
2400 
2401 /*
2402  * exported, called by kernel clients to perform same functions as with
2403  * userland ioctl() 
2404  */
2405 int snd_seq_kernel_client_ctl(int clientid, unsigned int cmd, void *arg)
2406 {
2407         struct snd_seq_client *client;
2408         mm_segment_t fs;
2409         int result;
2410 
2411         client = clientptr(clientid);
2412         if (client == NULL)
2413                 return -ENXIO;
2414         fs = snd_enter_user();
2415         result = snd_seq_do_ioctl(client, cmd, (void __force __user *)arg);
2416         snd_leave_user(fs);
2417         return result;
2418 }
2419 
2420 EXPORT_SYMBOL(snd_seq_kernel_client_ctl);
2421 
2422 /* exported (for OSS emulator) */
2423 int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait)
2424 {
2425         struct snd_seq_client *client;
2426 
2427         client = clientptr(clientid);
2428         if (client == NULL)
2429                 return -ENXIO;
2430 
2431         if (! snd_seq_write_pool_allocated(client))
2432                 return 1;
2433         if (snd_seq_pool_poll_wait(client->pool, file, wait))
2434                 return 1;
2435         return 0;
2436 }
2437 
2438 EXPORT_SYMBOL(snd_seq_kernel_client_write_poll);
2439 
2440 /*---------------------------------------------------------------------------*/
2441 
2442 #ifdef CONFIG_PROC_FS
2443 /*
2444  *  /proc interface
2445  */
2446 static void snd_seq_info_dump_subscribers(struct snd_info_buffer *buffer,
2447                                           struct snd_seq_port_subs_info *group,
2448                                           int is_src, char *msg)
2449 {
2450         struct list_head *p;
2451         struct snd_seq_subscribers *s;
2452         int count = 0;
2453 
2454         down_read(&group->list_mutex);
2455         if (list_empty(&group->list_head)) {
2456                 up_read(&group->list_mutex);
2457                 return;
2458         }
2459         snd_iprintf(buffer, msg);
2460         list_for_each(p, &group->list_head) {
2461                 if (is_src)
2462                         s = list_entry(p, struct snd_seq_subscribers, src_list);
2463                 else
2464                         s = list_entry(p, struct snd_seq_subscribers, dest_list);
2465                 if (count++)
2466                         snd_iprintf(buffer, ", ");
2467                 snd_iprintf(buffer, "%d:%d",
2468                             is_src ? s->info.dest.client : s->info.sender.client,
2469                             is_src ? s->info.dest.port : s->info.sender.port);
2470                 if (s->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP)
2471                         snd_iprintf(buffer, "[%c:%d]", ((s->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) ? 'r' : 't'), s->info.queue);
2472                 if (group->exclusive)
2473                         snd_iprintf(buffer, "[ex]");
2474         }
2475         up_read(&group->list_mutex);
2476         snd_iprintf(buffer, "\n");
2477 }
2478 
2479 #define FLAG_PERM_RD(perm) ((perm) & SNDRV_SEQ_PORT_CAP_READ ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_READ ? 'R' : 'r') : '-')
2480 #define FLAG_PERM_WR(perm) ((perm) & SNDRV_SEQ_PORT_CAP_WRITE ? ((perm) & SNDRV_SEQ_PORT_CAP_SUBS_WRITE ? 'W' : 'w') : '-')
2481 #define FLAG_PERM_EX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_NO_EXPORT ? '-' : 'e')
2482 
2483 #define FLAG_PERM_DUPLEX(perm) ((perm) & SNDRV_SEQ_PORT_CAP_DUPLEX ? 'X' : '-')
2484 
2485 static void snd_seq_info_dump_ports(struct snd_info_buffer *buffer,
2486                                     struct snd_seq_client *client)
2487 {
2488         struct snd_seq_client_port *p;
2489 
2490         mutex_lock(&client->ports_mutex);
2491         list_for_each_entry(p, &client->ports_list_head, list) {
2492                 snd_iprintf(buffer, "  Port %3d : \"%s\" (%c%c%c%c)\n",
2493                             p->addr.port, p->name,
2494                             FLAG_PERM_RD(p->capability),
2495                             FLAG_PERM_WR(p->capability),
2496                             FLAG_PERM_EX(p->capability),
2497                             FLAG_PERM_DUPLEX(p->capability));
2498                 snd_seq_info_dump_subscribers(buffer, &p->c_src, 1, "    Connecting To: ");
2499                 snd_seq_info_dump_subscribers(buffer, &p->c_dest, 0, "    Connected From: ");
2500         }
2501         mutex_unlock(&client->ports_mutex);
2502 }
2503 
2504 
2505 /* exported to seq_info.c */
2506 void snd_seq_info_clients_read(struct snd_info_entry *entry, 
2507                                struct snd_info_buffer *buffer)
2508 {
2509         int c;
2510         struct snd_seq_client *client;
2511 
2512         snd_iprintf(buffer, "Client info\n");
2513         snd_iprintf(buffer, "  cur  clients : %d\n", client_usage.cur);
2514         snd_iprintf(buffer, "  peak clients : %d\n", client_usage.peak);
2515         snd_iprintf(buffer, "  max  clients : %d\n", SNDRV_SEQ_MAX_CLIENTS);
2516         snd_iprintf(buffer, "\n");
2517 
2518         /* list the client table */
2519         for (c = 0; c < SNDRV_SEQ_MAX_CLIENTS; c++) {
2520                 client = snd_seq_client_use_ptr(c);
2521                 if (client == NULL)
2522                         continue;
2523                 if (client->type == NO_CLIENT) {
2524                         snd_seq_client_unlock(client);
2525                         continue;
2526                 }
2527 
2528                 snd_iprintf(buffer, "Client %3d : \"%s\" [%s]\n",
2529                             c, client->name,
2530                             client->type == USER_CLIENT ? "User" : "Kernel");
2531                 snd_seq_info_dump_ports(buffer, client);
2532                 if (snd_seq_write_pool_allocated(client)) {
2533                         snd_iprintf(buffer, "  Output pool :\n");
2534                         snd_seq_info_pool(buffer, client->pool, "    ");
2535                 }
2536                 if (client->type == USER_CLIENT && client->data.user.fifo &&
2537                     client->data.user.fifo->pool) {
2538                         snd_iprintf(buffer, "  Input pool :\n");
2539                         snd_seq_info_pool(buffer, client->data.user.fifo->pool, "    ");
2540                 }
2541                 snd_seq_client_unlock(client);
2542         }
2543 }
2544 #endif /* CONFIG_PROC_FS */
2545 
2546 /*---------------------------------------------------------------------------*/
2547 
2548 
2549 /*
2550  *  REGISTRATION PART
2551  */
2552 
2553 static const struct file_operations snd_seq_f_ops =
2554 {
2555         .owner =        THIS_MODULE,
2556         .read =         snd_seq_read,
2557         .write =        snd_seq_write,
2558         .open =         snd_seq_open,
2559         .release =      snd_seq_release,
2560         .llseek =       no_llseek,
2561         .poll =         snd_seq_poll,
2562         .unlocked_ioctl =       snd_seq_ioctl,
2563         .compat_ioctl = snd_seq_ioctl_compat,
2564 };
2565 
2566 /* 
2567  * register sequencer device 
2568  */
2569 int __init snd_sequencer_device_init(void)
2570 {
2571         int err;
2572 
2573         if (mutex_lock_interruptible(&register_mutex))
2574                 return -ERESTARTSYS;
2575 
2576         if ((err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
2577                                        &snd_seq_f_ops, NULL, "seq")) < 0) {
2578                 mutex_unlock(&register_mutex);
2579                 return err;
2580         }
2581         
2582         mutex_unlock(&register_mutex);
2583 
2584         return 0;
2585 }
2586 
2587 
2588 
2589 /* 
2590  * unregister sequencer device 
2591  */
2592 void __exit snd_sequencer_device_done(void)
2593 {
2594         snd_unregister_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0);
2595 }
2596 

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