core/seq/seq.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  *  ALSA sequencer main module
0004  *  Copyright (c) 1998-1999 by Frank van de Pol <fvdpol@coil.demon.nl>
0005  */
0006
0007 #include <linux/init.h>
0008 #include <linux/module.h>
0009 #include <linux/device.h>
0010 #include <sound/core.h>
0011 #include <sound/initval.h>
0012
0013 #include <sound/seq_kernel.h>
0014 #include "seq_clientmgr.h"
0015 #include "seq_memory.h"
0016 #include "seq_queue.h"
0017 #include "seq_lock.h"
0018 #include "seq_timer.h"
0019 #include "seq_system.h"
0020 #include "seq_info.h"
0021 #include <sound/minors.h>
0022 #include <sound/seq_device.h>
0023
0024 #if defined(CONFIG_SND_SEQ_DUMMY_MODULE)
0025 int seq_client_load[15] = {[0] = SNDRV_SEQ_CLIENT_DUMMY, [1 ... 14] = -1};
0026 #else
0027 int seq_client_load[15] = {[0 ... 14] = -1};
0028 #endif
0029 int seq_default_timer_class = SNDRV_TIMER_CLASS_GLOBAL;
0030 int seq_default_timer_sclass = SNDRV_TIMER_SCLASS_NONE;
0031 int seq_default_timer_card = -1;
0032 int seq_default_timer_device =
0033 #ifdef CONFIG_SND_SEQ_HRTIMER_DEFAULT
0034     SNDRV_TIMER_GLOBAL_HRTIMER
0035 #else
0036     SNDRV_TIMER_GLOBAL_SYSTEM
0037 #endif
0038     ;
0039 int seq_default_timer_subdevice = 0;
0040 int seq_default_timer_resolution = 0;   /* Hz */
0041
0042 MODULE_AUTHOR("Frank van de Pol <fvdpol@coil.demon.nl>, Jaroslav Kysela <perex@perex.cz>");
0043 MODULE_DESCRIPTION("Advanced Linux Sound Architecture sequencer.");
0044 MODULE_LICENSE("GPL");
0045
0046 module_param_array(seq_client_load, int, NULL, 0444);
0047 MODULE_PARM_DESC(seq_client_load, "The numbers of global (system) clients to load through kmod.");
0048 module_param(seq_default_timer_class, int, 0644);
0049 MODULE_PARM_DESC(seq_default_timer_class, "The default timer class.");
0050 module_param(seq_default_timer_sclass, int, 0644);
0051 MODULE_PARM_DESC(seq_default_timer_sclass, "The default timer slave class.");
0052 module_param(seq_default_timer_card, int, 0644);
0053 MODULE_PARM_DESC(seq_default_timer_card, "The default timer card number.");
0054 module_param(seq_default_timer_device, int, 0644);
0055 MODULE_PARM_DESC(seq_default_timer_device, "The default timer device number.");
0056 module_param(seq_default_timer_subdevice, int, 0644);
0057 MODULE_PARM_DESC(seq_default_timer_subdevice, "The default timer subdevice number.");
0058 module_param(seq_default_timer_resolution, int, 0644);
0059 MODULE_PARM_DESC(seq_default_timer_resolution, "The default timer resolution in Hz.");
0060
0061 MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_SEQUENCER);
0062 MODULE_ALIAS("devname:snd/seq");
0063
0064 /*
0065  *  INIT PART
0066  */
0067
0068 static int __init alsa_seq_init(void)
0069 {
0070     int err;
0071
0072     err = client_init_data();
0073     if (err < 0)
0074         goto error;
0075
0076     /* register sequencer device */
0077     err = snd_sequencer_device_init();
0078     if (err < 0)
0079         goto error;
0080
0081     /* register proc interface */
0082     err = snd_seq_info_init();
0083     if (err < 0)
0084         goto error_device;
0085
0086     /* register our internal client */
0087     err = snd_seq_system_client_init();
0088     if (err < 0)
0089         goto error_info;
0090
0091     snd_seq_autoload_init();
0092     return 0;
0093
0094  error_info:
0095     snd_seq_info_done();
0096  error_device:
0097     snd_sequencer_device_done();
0098  error:
0099     return err;
0100 }
0101
0102 static void __exit alsa_seq_exit(void)
0103 {
0104     /* unregister our internal client */
0105     snd_seq_system_client_done();
0106
0107     /* unregister proc interface */
0108     snd_seq_info_done();
0109
0110     /* delete timing queues */
0111     snd_seq_queues_delete();
0112
0113     /* unregister sequencer device */
0114     snd_sequencer_device_done();
0115
0116     snd_seq_autoload_exit();
0117 }
0118
0119 module_init(alsa_seq_init)
0120 module_exit(alsa_seq_exit)