opl4_seq.rar_V2

/* * OPL4 sequencer functions */ #include "opl4_local.h" #include <linux/init.h> #include <linux/moduleparam.h> #include <linux/module.h> #include <sound/initval.h> MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>"); MODULE_DESCRIPTION("OPL4 wavetable synth driver"); MODULE_LICENSE("Dual BSD/GPL"); int volume_boost = 8; module_param(volume_boost, int, 0644); MODULE_PARM_DESC(volume_boost, "Additional volume for OPL4 wavetable sounds."); static int snd_opl4_seq_use_inc(struct snd_opl4 *opl4) { if (!try_module_get(opl4->card->module)) return -EFAULT; return 0; } static void snd_opl4_seq_use_dec(struct snd_opl4 *opl4) { module_put(opl4->card->module); } static int snd_opl4_seq_use(void *private_data, struct snd_seq_port_subscribe *info) { struct snd_opl4 *opl4 = private_data; int err; mutex_lock(&opl4->access_mutex); if (opl4->used) { mutex_unlock(&opl4->access_mutex); return -EBUSY; } opl4->used++; if (info->sender.client != SNDRV_SEQ_CLIENT_SYSTEM) { err = snd_opl4_seq_use_inc(opl4); if (err < 0) { mutex_unlock(&opl4->access_mutex); return err; } } mutex_unlock(&opl4->access_mutex); snd_opl4_synth_reset(opl4); return 0; } static int snd_opl4_seq_unuse(void *private_data, struct snd_seq_port_subscribe *info) { struct snd_opl4 *opl4 = private_data; snd_opl4_synth_shutdown(opl4); mutex_lock(&opl4->access_mutex); opl4->used--; mutex_unlock(&opl4->access_mutex); if (info->sender.client != SNDRV_SEQ_CLIENT_SYSTEM) snd_opl4_seq_use_dec(opl4); return 0; } static struct snd_midi_op opl4_ops = { .note_on = snd_opl4_note_on, .note_off = snd_opl4_note_off, .note_terminate = snd_opl4_terminate_note, .control = snd_opl4_control, .sysex = snd_opl4_sysex, }; static int snd_opl4_seq_event_input(struct snd_seq_event *ev, int direct, void *private_data, int atomic, int hop) { struct snd_opl4 *opl4 = private_data; snd_midi_process_event(&opl4_ops, ev, opl4->chset); return 0; } static void snd_opl4_seq_free_port(void *private_data) { struct snd_opl4 *opl4 = private_data; snd_midi_channel_free_set(opl4->chset); } static int snd_opl4_seq_new_device(struct snd_seq_device *dev) { struct snd_opl4 *opl4; int client; struct snd_seq_port_callback pcallbacks; opl4 = *(struct snd_opl4 **)SNDRV_SEQ_DEVICE_ARGPTR(dev); if (!opl4) return -EINVAL; if (snd_yrw801_detect(opl4) < 0) return -ENODEV; opl4->chset = snd_midi_channel_alloc_set(16); if (!opl4->chset) return -ENOMEM; opl4->chset->private_data = opl4; /* allocate new client */ client = snd_seq_create_kernel_client(opl4->card, opl4->seq_dev_num, "OPL4 Wavetable"); if (client < 0) { snd_midi_channel_free_set(opl4->chset); return client; } opl4->seq_client = client; opl4->chset->client = client; /* create new port */ memset(&pcallbacks, 0, sizeof(pcallbacks)); pcallbacks.owner = THIS_MODULE; pcallbacks.use = snd_opl4_seq_use; pcallbacks.unuse = snd_opl4_seq_unuse; pcallbacks.event_input = snd_opl4_seq_event_input; pcallbacks.private_free = snd_opl4_seq_free_port; pcallbacks.private_data = opl4; opl4->chset->port = snd_seq_event_port_attach(client, &pcallbacks, SNDRV_SEQ_PORT_CAP_WRITE | SNDRV_SEQ_PORT_CAP_SUBS_WRITE, SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC | SNDRV_SEQ_PORT_TYPE_MIDI_GM | SNDRV_SEQ_PORT_TYPE_HARDWARE | SNDRV_SEQ_PORT_TYPE_SYNTHESIZER, 16, 24, "OPL4 Wavetable Port"); if (opl4->chset->port < 0) { int err = opl4->chset->port; snd_midi_channel_free_set(opl4->chset); snd_seq_delete_kernel_client(client); opl4->seq_client = -1; return err; } return 0; } static int snd_opl4_seq_delete_device(struct snd_seq_device *dev) { struct snd_opl4 *opl4; opl4 = *(struct snd_opl4 **)SNDRV_SEQ_DEVICE_ARGPTR(dev); if (!opl4) return -EINVAL; if (opl4->seq_client >= 0) { snd_seq_delete_kernel_client(opl4->seq_client); opl4->seq_client = -1; } return 0; } static int __init alsa_opl4_synth_init(void) { static struct snd_seq_dev_ops ops = { snd_opl4_seq_new_device, snd_opl4_seq_delete_device }; return snd_seq_device_register_driver(SNDRV_SEQ_DEV_ID_OPL4, &ops, sizeof(struct snd_opl4 *)); } static void __exit alsa_opl4_synth_exit(void) { snd_seq_device_unregister_driver(SNDRV_SEQ_DEV_ID_OPL4); } module_init(alsa_opl4_synth_init) module_exit(alsa_opl4_synth_exit)