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