sound/core/seq/oss/seq_oss_init.c

   1 /*
   2  * OSS compatible sequencer driver
   3  *
   4  * open/close and reset interface
   5  *
   6  * Copyright (C) 1998-1999 Takashi Iwai <tiwai@suse.de>
   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 #include "seq_oss_device.h"
  24 #include "seq_oss_synth.h"
  25 #include "seq_oss_midi.h"
  26 #include "seq_oss_writeq.h"
  27 #include "seq_oss_readq.h"
  28 #include "seq_oss_timer.h"
  29 #include "seq_oss_event.h"
  30 #include <linux/init.h>
  31 #include <linux/module.h>
  32 #include <linux/slab.h>
  33
  34 /*
  35  * common variables
  36  */
  37 static int maxqlen = SNDRV_SEQ_OSS_MAX_QLEN;
  38 module_param(maxqlen, int, 0444);
  39 MODULE_PARM_DESC(maxqlen, "maximum queue length");
  40
  41 static int system_client = -1; /* ALSA sequencer client number */
  42 static int system_port = -1;
  43
  44 static int num_clients;
  45 static struct seq_oss_devinfo *client_table[SNDRV_SEQ_OSS_MAX_CLIENTS];
  46
  47
  48 /*
  49  * prototypes
  50  */
  51 static int receive_announce(struct snd_seq_event *ev, int direct, void *private, int atomic, int hop);
  52 static int translate_mode(struct file *file);
  53 static int create_port(struct seq_oss_devinfo *dp);
  54 static int delete_port(struct seq_oss_devinfo *dp);
  55 static int alloc_seq_queue(struct seq_oss_devinfo *dp);
  56 static int delete_seq_queue(int queue);
  57 static void free_devinfo(void *private);
  58
  59 #define call_ctl(type,rec) snd_seq_kernel_client_ctl(system_client, type, rec)
  60
  61
  62 /*
  63  * create sequencer client for OSS sequencer
  64  */
  65 int __init
  66 snd_seq_oss_create_client(void)
  67 {
  68         int rc;
  69         struct snd_seq_port_info *port;
  70         struct snd_seq_port_callback port_callback;
  71
  72         port = kmalloc(sizeof(*port), GFP_KERNEL);
  73         if (!port) {
  74                 rc = -ENOMEM;
  75                 goto __error;
  76         }
  77
  78         /* create ALSA client */
  79         rc = snd_seq_create_kernel_client(NULL, SNDRV_SEQ_CLIENT_OSS,
  80                                           "OSS sequencer");
  81         if (rc < 0)
  82                 goto __error;
  83
  84         system_client = rc;
  85         debug_printk(("new client = %d\n", rc));
  86
  87         /* look up midi devices */
  88         snd_seq_oss_midi_lookup_ports(system_client);
  89
  90         /* create annoucement receiver port */
  91         memset(port, 0, sizeof(*port));
  92         strcpy(port->name, "Receiver");
  93         port->addr.client = system_client;
  94         port->capability = SNDRV_SEQ_PORT_CAP_WRITE; /* receive only */
  95         port->type = 0;
  96
  97         memset(&port_callback, 0, sizeof(port_callback));
  98         /* don't set port_callback.owner here. otherwise the module counter
  99          * is incremented and we can no longer release the module..
 100          */
 101         port_callback.event_input = receive_announce;
 102         port->kernel = &port_callback;
 103
 104         call_ctl(SNDRV_SEQ_IOCTL_CREATE_PORT, port);
 105         if ((system_port = port->addr.port) >= 0) {
 106                 struct snd_seq_port_subscribe subs;
 107
 108                 memset(&subs, 0, sizeof(subs));
 109                 subs.sender.client = SNDRV_SEQ_CLIENT_SYSTEM;
 110                 subs.sender.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
 111                 subs.dest.client = system_client;
 112                 subs.dest.port = system_port;
 113                 call_ctl(SNDRV_SEQ_IOCTL_SUBSCRIBE_PORT, &subs);
 114         }
 115         rc = 0;
 116
 117  __error:
 118         kfree(port);
 119         return rc;
 120 }
 121
 122
 123 /*
 124  * receive annoucement from system port, and check the midi device
 125  */
 126 static int
 127 receive_announce(struct snd_seq_event *ev, int direct, void *private, int atomic, int hop)
 128 {
 129         struct snd_seq_port_info pinfo;
 130
 131         if (atomic)
 132                 return 0; /* it must not happen */
 133
 134         switch (ev->type) {
 135         case SNDRV_SEQ_EVENT_PORT_START:
 136         case SNDRV_SEQ_EVENT_PORT_CHANGE:
 137                 if (ev->data.addr.client == system_client)
 138                         break; /* ignore myself */
 139                 memset(&pinfo, 0, sizeof(pinfo));
 140                 pinfo.addr = ev->data.addr;
 141                 if (call_ctl(SNDRV_SEQ_IOCTL_GET_PORT_INFO, &pinfo) >= 0)
 142                         snd_seq_oss_midi_check_new_port(&pinfo);
 143                 break;
 144
 145         case SNDRV_SEQ_EVENT_PORT_EXIT:
 146                 if (ev->data.addr.client == system_client)
 147                         break; /* ignore myself */
 148                 snd_seq_oss_midi_check_exit_port(ev->data.addr.client,
 149                                                 ev->data.addr.port);
 150                 break;
 151         }
 152         return 0;
 153 }
 154
 155
 156 /*
 157  * delete OSS sequencer client
 158  */
 159 int
 160 snd_seq_oss_delete_client(void)
 161 {
 162         if (system_client >= 0)
 163                 snd_seq_delete_kernel_client(system_client);
 164
 165         snd_seq_oss_midi_clear_all();
 166
 167         return 0;
 168 }
 169
 170
 171 /*
 172  * open sequencer device
 173  */
 174 int
 175 snd_seq_oss_open(struct file *file, int level)
 176 {
 177         int i, rc;
 178         struct seq_oss_devinfo *dp;
 179
 180         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
 181         if (!dp) {
 182                 snd_printk(KERN_ERR "can't malloc device info\n");
 183                 return -ENOMEM;
 184         }
 185         debug_printk(("oss_open: dp = %p\n", dp));
 186
 187         dp->cseq = system_client;
 188         dp->port = -1;
 189         dp->queue = -1;
 190
 191         for (i = 0; i < SNDRV_SEQ_OSS_MAX_CLIENTS; i++) {
 192                 if (client_table[i] == NULL)
 193                         break;
 194         }
 195
 196         dp->index = i;
 197         if (i >= SNDRV_SEQ_OSS_MAX_CLIENTS) {
 198                 snd_printk(KERN_ERR "too many applications\n");
 199                 rc = -ENOMEM;
 200                 goto _error;
 201         }
 202
 203         /* look up synth and midi devices */
 204         snd_seq_oss_synth_setup(dp);
 205         snd_seq_oss_midi_setup(dp);
 206
 207         if (dp->synth_opened == 0 && dp->max_mididev == 0) {
 208                 /* snd_printk(KERN_ERR "no device found\n"); */
 209                 rc = -ENODEV;
 210                 goto _error;
 211         }
 212
 213         /* create port */
 214         debug_printk(("create new port\n"));
 215         rc = create_port(dp);
 216         if (rc < 0) {
 217                 snd_printk(KERN_ERR "can't create port\n");
 218                 goto _error;
 219         }
 220
 221         /* allocate queue */
 222         debug_printk(("allocate queue\n"));
 223         rc = alloc_seq_queue(dp);
 224         if (rc < 0)
 225                 goto _error;
 226
 227         /* set address */
 228         dp->addr.client = dp->cseq;
 229         dp->addr.port = dp->port;
 230         /*dp->addr.queue = dp->queue;*/
 231         /*dp->addr.channel = 0;*/
 232
 233         dp->seq_mode = level;
 234
 235         /* set up file mode */
 236         dp->file_mode = translate_mode(file);
 237
 238         /* initialize read queue */
 239         debug_printk(("initialize read queue\n"));
 240         if (is_read_mode(dp->file_mode)) {
 241                 dp->readq = snd_seq_oss_readq_new(dp, maxqlen);
 242                 if (!dp->readq) {
 243                         rc = -ENOMEM;
 244                         goto _error;
 245                 }
 246         }
 247
 248         /* initialize write queue */
 249         debug_printk(("initialize write queue\n"));
 250         if (is_write_mode(dp->file_mode)) {
 251                 dp->writeq = snd_seq_oss_writeq_new(dp, maxqlen);
 252                 if (!dp->writeq) {
 253                         rc = -ENOMEM;
 254                         goto _error;
 255                 }
 256         }
 257
 258         /* initialize timer */
 259         debug_printk(("initialize timer\n"));
 260         dp->timer = snd_seq_oss_timer_new(dp);
 261         if (!dp->timer) {
 262                 snd_printk(KERN_ERR "can't alloc timer\n");
 263                 rc = -ENOMEM;
 264                 goto _error;
 265         }
 266         debug_printk(("timer initialized\n"));
 267
 268         /* set private data pointer */
 269         file->private_data = dp;
 270
 271         /* set up for mode2 */
 272         if (level == SNDRV_SEQ_OSS_MODE_MUSIC)
 273                 snd_seq_oss_synth_setup_midi(dp);
 274         else if (is_read_mode(dp->file_mode))
 275                 snd_seq_oss_midi_open_all(dp, SNDRV_SEQ_OSS_FILE_READ);
 276
 277         client_table[dp->index] = dp;
 278         num_clients++;
 279
 280         debug_printk(("open done\n"));
 281         return 0;
 282
 283  _error:
 284         snd_seq_oss_synth_cleanup(dp);
 285         snd_seq_oss_midi_cleanup(dp);
 286         delete_seq_queue(dp->queue);
 287         delete_port(dp);
 288
 289         return rc;
 290 }
 291
 292 /*
 293  * translate file flags to private mode
 294  */
 295 static int
 296 translate_mode(struct file *file)
 297 {
 298         int file_mode = 0;
 299         if ((file->f_flags & O_ACCMODE) != O_RDONLY)
 300                 file_mode |= SNDRV_SEQ_OSS_FILE_WRITE;
 301         if ((file->f_flags & O_ACCMODE) != O_WRONLY)
 302                 file_mode |= SNDRV_SEQ_OSS_FILE_READ;
 303         if (file->f_flags & O_NONBLOCK)
 304                 file_mode |= SNDRV_SEQ_OSS_FILE_NONBLOCK;
 305         return file_mode;
 306 }
 307
 308
 309 /*
 310  * create sequencer port
 311  */
 312 static int
 313 create_port(struct seq_oss_devinfo *dp)
 314 {
 315         int rc;
 316         struct snd_seq_port_info port;
 317         struct snd_seq_port_callback callback;
 318
 319         memset(&port, 0, sizeof(port));
 320         port.addr.client = dp->cseq;
 321         sprintf(port.name, "Sequencer-%d", dp->index);
 322         port.capability = SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_WRITE; /* no subscription */
 323         port.type = SNDRV_SEQ_PORT_TYPE_SPECIFIC;
 324         port.midi_channels = 128;
 325         port.synth_voices = 128;
 326
 327         memset(&callback, 0, sizeof(callback));
 328         callback.owner = THIS_MODULE;
 329         callback.private_data = dp;
 330         callback.event_input = snd_seq_oss_event_input;
 331         callback.private_free = free_devinfo;
 332         port.kernel = &callback;
 333
 334         rc = call_ctl(SNDRV_SEQ_IOCTL_CREATE_PORT, &port);
 335         if (rc < 0)
 336                 return rc;
 337
 338         dp->port = port.addr.port;
 339         debug_printk(("new port = %d\n", port.addr.port));
 340
 341         return 0;
 342 }
 343
 344 /*
 345  * delete ALSA port
 346  */
 347 static int
 348 delete_port(struct seq_oss_devinfo *dp)
 349 {
 350         if (dp->port < 0) {
 351                 kfree(dp);
 352                 return 0;
 353         }
 354
 355         debug_printk(("delete_port %i\n", dp->port));
 356         return snd_seq_event_port_detach(dp->cseq, dp->port);
 357 }
 358
 359 /*
 360  * allocate a queue
 361  */
 362 static int
 363 alloc_seq_queue(struct seq_oss_devinfo *dp)
 364 {
 365         struct snd_seq_queue_info qinfo;
 366         int rc;
 367
 368         memset(&qinfo, 0, sizeof(qinfo));
 369         qinfo.owner = system_client;
 370         qinfo.locked = 1;
 371         strcpy(qinfo.name, "OSS Sequencer Emulation");
 372         if ((rc = call_ctl(SNDRV_SEQ_IOCTL_CREATE_QUEUE, &qinfo)) < 0)
 373                 return rc;
 374         dp->queue = qinfo.queue;
 375         return 0;
 376 }
 377
 378 /*
 379  * release queue
 380  */
 381 static int
 382 delete_seq_queue(int queue)
 383 {
 384         struct snd_seq_queue_info qinfo;
 385         int rc;
 386
 387         if (queue < 0)
 388                 return 0;
 389         memset(&qinfo, 0, sizeof(qinfo));
 390         qinfo.queue = queue;
 391         rc = call_ctl(SNDRV_SEQ_IOCTL_DELETE_QUEUE, &qinfo);
 392         if (rc < 0)
 393                 printk(KERN_ERR "seq-oss: unable to delete queue %d (%d)\n", queue, rc);
 394         return rc;
 395 }
 396
 397
 398 /*
 399  * free device informations - private_free callback of port
 400  */
 401 static void
 402 free_devinfo(void *private)
 403 {
 404         struct seq_oss_devinfo *dp = (struct seq_oss_devinfo *)private;
 405
 406         if (dp->timer)
 407                 snd_seq_oss_timer_delete(dp->timer);
 408
 409         if (dp->writeq)
 410                 snd_seq_oss_writeq_delete(dp->writeq);
 411
 412         if (dp->readq)
 413                 snd_seq_oss_readq_delete(dp->readq);
 414
 415         kfree(dp);
 416 }
 417
 418
 419 /*
 420  * close sequencer device
 421  */
 422 void
 423 snd_seq_oss_release(struct seq_oss_devinfo *dp)
 424 {
 425         int queue;
 426
 427         client_table[dp->index] = NULL;
 428         num_clients--;
 429
 430         debug_printk(("resetting..\n"));
 431         snd_seq_oss_reset(dp);
 432
 433         debug_printk(("cleaning up..\n"));
 434         snd_seq_oss_synth_cleanup(dp);
 435         snd_seq_oss_midi_cleanup(dp);
 436
 437         /* clear slot */
 438         debug_printk(("releasing resource..\n"));
 439         queue = dp->queue;
 440         if (dp->port >= 0)
 441                 delete_port(dp);
 442         delete_seq_queue(queue);
 443
 444         debug_printk(("release done\n"));
 445 }
 446
 447
 448 /*
 449  * Wait until the queue is empty (if we don't have nonblock)
 450  */
 451 void
 452 snd_seq_oss_drain_write(struct seq_oss_devinfo *dp)
 453 {
 454         if (! dp->timer->running)
 455                 return;
 456         if (is_write_mode(dp->file_mode) && !is_nonblock_mode(dp->file_mode) &&
 457             dp->writeq) {
 458                 debug_printk(("syncing..\n"));
 459                 while (snd_seq_oss_writeq_sync(dp->writeq))
 460                         ;
 461         }
 462 }
 463
 464
 465 /*
 466  * reset sequencer devices
 467  */
 468 void
 469 snd_seq_oss_reset(struct seq_oss_devinfo *dp)
 470 {
 471         int i;
 472
 473         /* reset all synth devices */
 474         for (i = 0; i < dp->max_synthdev; i++)
 475                 snd_seq_oss_synth_reset(dp, i);
 476
 477         /* reset all midi devices */
 478         if (dp->seq_mode != SNDRV_SEQ_OSS_MODE_MUSIC) {
 479                 for (i = 0; i < dp->max_mididev; i++)
 480                         snd_seq_oss_midi_reset(dp, i);
 481         }
 482
 483         /* remove queues */
 484         if (dp->readq)
 485                 snd_seq_oss_readq_clear(dp->readq);
 486         if (dp->writeq)
 487                 snd_seq_oss_writeq_clear(dp->writeq);
 488
 489         /* reset timer */
 490         snd_seq_oss_timer_stop(dp->timer);
 491 }
 492
 493
 494 #ifdef CONFIG_PROC_FS
 495 /*
 496  * misc. functions for proc interface
 497  */
 498 char *
 499 enabled_str(int bool)
 500 {
 501         return bool ? "enabled" : "disabled";
 502 }
 503
 504 static char *
 505 filemode_str(int val)
 506 {
 507         static char *str[] = {
 508                 "none", "read", "write", "read/write",
 509         };
 510         return str[val & SNDRV_SEQ_OSS_FILE_ACMODE];
 511 }
 512
 513
 514 /*
 515  * proc interface
 516  */
 517 void
 518 snd_seq_oss_system_info_read(struct snd_info_buffer *buf)
 519 {
 520         int i;
 521         struct seq_oss_devinfo *dp;
 522
 523         snd_iprintf(buf, "ALSA client number %d\n", system_client);
 524         snd_iprintf(buf, "ALSA receiver port %d\n", system_port);
 525
 526         snd_iprintf(buf, "\nNumber of applications: %d\n", num_clients);
 527         for (i = 0; i < num_clients; i++) {
 528                 snd_iprintf(buf, "\nApplication %d: ", i);
 529                 if ((dp = client_table[i]) == NULL) {
 530                         snd_iprintf(buf, "*empty*\n");
 531                         continue;
 532                 }
 533                 snd_iprintf(buf, "port %d : queue %d\n", dp->port, dp->queue);
 534                 snd_iprintf(buf, "  sequencer mode = %s : file open mode = %s\n",
 535                             (dp->seq_mode ? "music" : "synth"),
 536                             filemode_str(dp->file_mode));
 537                 if (dp->seq_mode)
 538                         snd_iprintf(buf, "  timer tempo = %d, timebase = %d\n",
 539                                     dp->timer->oss_tempo, dp->timer->oss_timebase);
 540                 snd_iprintf(buf, "  max queue length %d\n", maxqlen);
 541                 if (is_read_mode(dp->file_mode) && dp->readq)
 542                         snd_seq_oss_readq_info_read(dp->readq, buf);
 543         }
 544 }
 545 #endif /* CONFIG_PROC_FS */