11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * ALSA sequencer System services Client 31da177e4SLinus Torvalds * Copyright (c) 1998-1999 by Frank van de Pol <fvdpol@coil.demon.nl> 41da177e4SLinus Torvalds * 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or modify 71da177e4SLinus Torvalds * it under the terms of the GNU General Public License as published by 81da177e4SLinus Torvalds * the Free Software Foundation; either version 2 of the License, or 91da177e4SLinus Torvalds * (at your option) any later version. 101da177e4SLinus Torvalds * 111da177e4SLinus Torvalds * This program is distributed in the hope that it will be useful, 121da177e4SLinus Torvalds * but WITHOUT ANY WARRANTY; without even the implied warranty of 131da177e4SLinus Torvalds * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 141da177e4SLinus Torvalds * GNU General Public License for more details. 151da177e4SLinus Torvalds * 161da177e4SLinus Torvalds * You should have received a copy of the GNU General Public License 171da177e4SLinus Torvalds * along with this program; if not, write to the Free Software 181da177e4SLinus Torvalds * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 191da177e4SLinus Torvalds * 201da177e4SLinus Torvalds */ 211da177e4SLinus Torvalds 221da177e4SLinus Torvalds #include <sound/driver.h> 231da177e4SLinus Torvalds #include <linux/init.h> 241da177e4SLinus Torvalds #include <sound/core.h> 251da177e4SLinus Torvalds #include "seq_system.h" 261da177e4SLinus Torvalds #include "seq_timer.h" 271da177e4SLinus Torvalds #include "seq_queue.h" 281da177e4SLinus Torvalds 291da177e4SLinus Torvalds /* internal client that provide system services, access to timer etc. */ 301da177e4SLinus Torvalds 311da177e4SLinus Torvalds /* 321da177e4SLinus Torvalds * Port "Timer" 331da177e4SLinus Torvalds * - send tempo /start/stop etc. events to this port to manipulate the 341da177e4SLinus Torvalds * queue's timer. The queue address is specified in 351da177e4SLinus Torvalds * data.queue.queue. 361da177e4SLinus Torvalds * - this port supports subscription. The received timer events are 371da177e4SLinus Torvalds * broadcasted to all subscribed clients. The modified tempo 381da177e4SLinus Torvalds * value is stored on data.queue.value. 391da177e4SLinus Torvalds * The modifier client/port is not send. 401da177e4SLinus Torvalds * 411da177e4SLinus Torvalds * Port "Announce" 421da177e4SLinus Torvalds * - does not receive message 431da177e4SLinus Torvalds * - supports supscription. For each client or port attaching to or 441da177e4SLinus Torvalds * detaching from the system an announcement is send to the subscribed 451da177e4SLinus Torvalds * clients. 461da177e4SLinus Torvalds * 471da177e4SLinus Torvalds * Idea: the subscription mechanism might also work handy for distributing 481da177e4SLinus Torvalds * synchronisation and timing information. In this case we would ideally have 491da177e4SLinus Torvalds * a list of subscribers for each type of sync (time, tick), for each timing 501da177e4SLinus Torvalds * queue. 511da177e4SLinus Torvalds * 521da177e4SLinus Torvalds * NOTE: the queue to be started, stopped, etc. must be specified 531da177e4SLinus Torvalds * in data.queue.addr.queue field. queue is used only for 541da177e4SLinus Torvalds * scheduling, and no longer referred as affected queue. 551da177e4SLinus Torvalds * They are used only for timer broadcast (see above). 561da177e4SLinus Torvalds * -- iwai 571da177e4SLinus Torvalds */ 581da177e4SLinus Torvalds 591da177e4SLinus Torvalds 601da177e4SLinus Torvalds /* client id of our system client */ 611da177e4SLinus Torvalds static int sysclient = -1; 621da177e4SLinus Torvalds 631da177e4SLinus Torvalds /* port id numbers for this client */ 641da177e4SLinus Torvalds static int announce_port = -1; 651da177e4SLinus Torvalds 661da177e4SLinus Torvalds 671da177e4SLinus Torvalds 681da177e4SLinus Torvalds /* fill standard header data, source port & channel are filled in */ 691da177e4SLinus Torvalds static int setheader(snd_seq_event_t * ev, int client, int port) 701da177e4SLinus Torvalds { 711da177e4SLinus Torvalds if (announce_port < 0) 721da177e4SLinus Torvalds return -ENODEV; 731da177e4SLinus Torvalds 741da177e4SLinus Torvalds memset(ev, 0, sizeof(snd_seq_event_t)); 751da177e4SLinus Torvalds 761da177e4SLinus Torvalds ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK; 771da177e4SLinus Torvalds ev->flags |= SNDRV_SEQ_EVENT_LENGTH_FIXED; 781da177e4SLinus Torvalds 791da177e4SLinus Torvalds ev->source.client = sysclient; 801da177e4SLinus Torvalds ev->source.port = announce_port; 811da177e4SLinus Torvalds ev->dest.client = SNDRV_SEQ_ADDRESS_SUBSCRIBERS; 821da177e4SLinus Torvalds 831da177e4SLinus Torvalds /* fill data */ 841da177e4SLinus Torvalds /*ev->data.addr.queue = SNDRV_SEQ_ADDRESS_UNKNOWN;*/ 851da177e4SLinus Torvalds ev->data.addr.client = client; 861da177e4SLinus Torvalds ev->data.addr.port = port; 871da177e4SLinus Torvalds 881da177e4SLinus Torvalds return 0; 891da177e4SLinus Torvalds } 901da177e4SLinus Torvalds 911da177e4SLinus Torvalds 921da177e4SLinus Torvalds /* entry points for broadcasting system events */ 931da177e4SLinus Torvalds void snd_seq_system_broadcast(int client, int port, int type) 941da177e4SLinus Torvalds { 951da177e4SLinus Torvalds snd_seq_event_t ev; 961da177e4SLinus Torvalds 971da177e4SLinus Torvalds if (setheader(&ev, client, port) < 0) 981da177e4SLinus Torvalds return; 991da177e4SLinus Torvalds ev.type = type; 1001da177e4SLinus Torvalds snd_seq_kernel_client_dispatch(sysclient, &ev, 0, 0); 1011da177e4SLinus Torvalds } 1021da177e4SLinus Torvalds 1031da177e4SLinus Torvalds /* entry points for broadcasting system events */ 1041da177e4SLinus Torvalds int snd_seq_system_notify(int client, int port, snd_seq_event_t *ev) 1051da177e4SLinus Torvalds { 1061da177e4SLinus Torvalds ev->flags = SNDRV_SEQ_EVENT_LENGTH_FIXED; 1071da177e4SLinus Torvalds ev->source.client = sysclient; 1081da177e4SLinus Torvalds ev->source.port = announce_port; 1091da177e4SLinus Torvalds ev->dest.client = client; 1101da177e4SLinus Torvalds ev->dest.port = port; 1111da177e4SLinus Torvalds return snd_seq_kernel_client_dispatch(sysclient, ev, 0, 0); 1121da177e4SLinus Torvalds } 1131da177e4SLinus Torvalds 1141da177e4SLinus Torvalds /* call-back handler for timer events */ 1151da177e4SLinus Torvalds static int event_input_timer(snd_seq_event_t * ev, int direct, void *private_data, int atomic, int hop) 1161da177e4SLinus Torvalds { 1171da177e4SLinus Torvalds return snd_seq_control_queue(ev, atomic, hop); 1181da177e4SLinus Torvalds } 1191da177e4SLinus Torvalds 1201da177e4SLinus Torvalds /* register our internal client */ 1211da177e4SLinus Torvalds int __init snd_seq_system_client_init(void) 1221da177e4SLinus Torvalds { 1231da177e4SLinus Torvalds 1241da177e4SLinus Torvalds snd_seq_client_callback_t callbacks; 1251da177e4SLinus Torvalds snd_seq_port_callback_t pcallbacks; 1261da177e4SLinus Torvalds snd_seq_client_info_t *inf; 1271da177e4SLinus Torvalds snd_seq_port_info_t *port; 1281da177e4SLinus Torvalds 129ecca82b4STakashi Iwai inf = kzalloc(sizeof(*inf), GFP_KERNEL); 130ecca82b4STakashi Iwai port = kzalloc(sizeof(*port), GFP_KERNEL); 1311da177e4SLinus Torvalds if (! inf || ! port) { 1321da177e4SLinus Torvalds kfree(inf); 1331da177e4SLinus Torvalds kfree(port); 1341da177e4SLinus Torvalds return -ENOMEM; 1351da177e4SLinus Torvalds } 1361da177e4SLinus Torvalds 1371da177e4SLinus Torvalds memset(&callbacks, 0, sizeof(callbacks)); 1381da177e4SLinus Torvalds memset(&pcallbacks, 0, sizeof(pcallbacks)); 1391da177e4SLinus Torvalds pcallbacks.owner = THIS_MODULE; 1401da177e4SLinus Torvalds pcallbacks.event_input = event_input_timer; 1411da177e4SLinus Torvalds 1421da177e4SLinus Torvalds /* register client */ 1431da177e4SLinus Torvalds callbacks.allow_input = callbacks.allow_output = 1; 1441da177e4SLinus Torvalds sysclient = snd_seq_create_kernel_client(NULL, 0, &callbacks); 1451da177e4SLinus Torvalds 1461da177e4SLinus Torvalds /* set our name */ 1471da177e4SLinus Torvalds inf->client = 0; 1481da177e4SLinus Torvalds inf->type = KERNEL_CLIENT; 1491da177e4SLinus Torvalds strcpy(inf->name, "System"); 1501da177e4SLinus Torvalds snd_seq_kernel_client_ctl(sysclient, SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, inf); 1511da177e4SLinus Torvalds 1521da177e4SLinus Torvalds /* register timer */ 1531da177e4SLinus Torvalds strcpy(port->name, "Timer"); 1541da177e4SLinus Torvalds port->capability = SNDRV_SEQ_PORT_CAP_WRITE; /* accept queue control */ 1551da177e4SLinus Torvalds port->capability |= SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ; /* for broadcast */ 1561da177e4SLinus Torvalds port->kernel = &pcallbacks; 1571da177e4SLinus Torvalds port->type = 0; 1581da177e4SLinus Torvalds port->flags = SNDRV_SEQ_PORT_FLG_GIVEN_PORT; 1591da177e4SLinus Torvalds port->addr.client = sysclient; 1601da177e4SLinus Torvalds port->addr.port = SNDRV_SEQ_PORT_SYSTEM_TIMER; 1611da177e4SLinus Torvalds snd_seq_kernel_client_ctl(sysclient, SNDRV_SEQ_IOCTL_CREATE_PORT, port); 1621da177e4SLinus Torvalds 1631da177e4SLinus Torvalds /* register announcement port */ 1641da177e4SLinus Torvalds strcpy(port->name, "Announce"); 1651da177e4SLinus Torvalds port->capability = SNDRV_SEQ_PORT_CAP_READ|SNDRV_SEQ_PORT_CAP_SUBS_READ; /* for broadcast only */ 1661da177e4SLinus Torvalds port->kernel = NULL; 1671da177e4SLinus Torvalds port->type = 0; 1681da177e4SLinus Torvalds port->flags = SNDRV_SEQ_PORT_FLG_GIVEN_PORT; 1691da177e4SLinus Torvalds port->addr.client = sysclient; 1701da177e4SLinus Torvalds port->addr.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE; 1711da177e4SLinus Torvalds snd_seq_kernel_client_ctl(sysclient, SNDRV_SEQ_IOCTL_CREATE_PORT, port); 1721da177e4SLinus Torvalds announce_port = port->addr.port; 1731da177e4SLinus Torvalds 1741da177e4SLinus Torvalds kfree(inf); 1751da177e4SLinus Torvalds kfree(port); 1761da177e4SLinus Torvalds return 0; 1771da177e4SLinus Torvalds } 1781da177e4SLinus Torvalds 1791da177e4SLinus Torvalds 1801da177e4SLinus Torvalds /* unregister our internal client */ 1811da177e4SLinus Torvalds void __exit snd_seq_system_client_done(void) 1821da177e4SLinus Torvalds { 1831da177e4SLinus Torvalds int oldsysclient = sysclient; 1841da177e4SLinus Torvalds 1851da177e4SLinus Torvalds if (oldsysclient >= 0) { 1861da177e4SLinus Torvalds sysclient = -1; 1871da177e4SLinus Torvalds announce_port = -1; 1881da177e4SLinus Torvalds snd_seq_delete_kernel_client(oldsysclient); 1891da177e4SLinus Torvalds } 1901da177e4SLinus Torvalds } 191