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403 lines
8.3 KiB
403 lines
8.3 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Midi Sequencer interface routines. |
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* |
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* Copyright (C) 1999 Steve Ratcliffe |
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* Copyright (c) 1999-2000 Takashi Iwai <[email protected]> |
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*/ |
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#include "emux_voice.h" |
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#include <linux/slab.h> |
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#include <linux/module.h> |
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/* Prototypes for static functions */ |
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static void free_port(void *private); |
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static void snd_emux_init_port(struct snd_emux_port *p); |
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static int snd_emux_use(void *private_data, struct snd_seq_port_subscribe *info); |
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static int snd_emux_unuse(void *private_data, struct snd_seq_port_subscribe *info); |
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/* |
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* MIDI emulation operators |
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*/ |
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static const struct snd_midi_op emux_ops = { |
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.note_on = snd_emux_note_on, |
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.note_off = snd_emux_note_off, |
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.key_press = snd_emux_key_press, |
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.note_terminate = snd_emux_terminate_note, |
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.control = snd_emux_control, |
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.nrpn = snd_emux_nrpn, |
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.sysex = snd_emux_sysex, |
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}; |
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/* |
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* number of MIDI channels |
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*/ |
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#define MIDI_CHANNELS 16 |
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/* |
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* type flags for MIDI sequencer port |
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*/ |
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#define DEFAULT_MIDI_TYPE (SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC |\ |
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SNDRV_SEQ_PORT_TYPE_MIDI_GM |\ |
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SNDRV_SEQ_PORT_TYPE_MIDI_GS |\ |
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SNDRV_SEQ_PORT_TYPE_MIDI_XG |\ |
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SNDRV_SEQ_PORT_TYPE_HARDWARE |\ |
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SNDRV_SEQ_PORT_TYPE_SYNTHESIZER) |
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/* |
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* Initialise the EMUX Synth by creating a client and registering |
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* a series of ports. |
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* Each of the ports will contain the 16 midi channels. Applications |
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* can connect to these ports to play midi data. |
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*/ |
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int |
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snd_emux_init_seq(struct snd_emux *emu, struct snd_card *card, int index) |
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{ |
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int i; |
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struct snd_seq_port_callback pinfo; |
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char tmpname[64]; |
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emu->client = snd_seq_create_kernel_client(card, index, |
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"%s WaveTable", emu->name); |
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if (emu->client < 0) { |
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snd_printk(KERN_ERR "can't create client\n"); |
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return -ENODEV; |
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} |
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if (emu->num_ports < 0) { |
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snd_printk(KERN_WARNING "seqports must be greater than zero\n"); |
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emu->num_ports = 1; |
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} else if (emu->num_ports >= SNDRV_EMUX_MAX_PORTS) { |
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snd_printk(KERN_WARNING "too many ports." |
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"limited max. ports %d\n", SNDRV_EMUX_MAX_PORTS); |
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emu->num_ports = SNDRV_EMUX_MAX_PORTS; |
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} |
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memset(&pinfo, 0, sizeof(pinfo)); |
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pinfo.owner = THIS_MODULE; |
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pinfo.use = snd_emux_use; |
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pinfo.unuse = snd_emux_unuse; |
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pinfo.event_input = snd_emux_event_input; |
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for (i = 0; i < emu->num_ports; i++) { |
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struct snd_emux_port *p; |
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sprintf(tmpname, "%s Port %d", emu->name, i); |
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p = snd_emux_create_port(emu, tmpname, MIDI_CHANNELS, |
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0, &pinfo); |
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if (!p) { |
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snd_printk(KERN_ERR "can't create port\n"); |
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return -ENOMEM; |
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} |
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p->port_mode = SNDRV_EMUX_PORT_MODE_MIDI; |
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snd_emux_init_port(p); |
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emu->ports[i] = p->chset.port; |
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emu->portptrs[i] = p; |
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} |
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return 0; |
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} |
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/* |
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* Detach from the ports that were set up for this synthesizer and |
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* destroy the kernel client. |
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*/ |
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void |
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snd_emux_detach_seq(struct snd_emux *emu) |
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{ |
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if (emu->voices) |
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snd_emux_terminate_all(emu); |
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if (emu->client >= 0) { |
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snd_seq_delete_kernel_client(emu->client); |
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emu->client = -1; |
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} |
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} |
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/* |
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* create a sequencer port and channel_set |
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*/ |
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struct snd_emux_port * |
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snd_emux_create_port(struct snd_emux *emu, char *name, |
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int max_channels, int oss_port, |
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struct snd_seq_port_callback *callback) |
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{ |
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struct snd_emux_port *p; |
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int i, type, cap; |
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/* Allocate structures for this channel */ |
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p = kzalloc(sizeof(*p), GFP_KERNEL); |
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if (!p) |
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return NULL; |
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p->chset.channels = kcalloc(max_channels, sizeof(*p->chset.channels), |
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GFP_KERNEL); |
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if (!p->chset.channels) { |
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kfree(p); |
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return NULL; |
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} |
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for (i = 0; i < max_channels; i++) |
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p->chset.channels[i].number = i; |
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p->chset.private_data = p; |
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p->chset.max_channels = max_channels; |
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p->emu = emu; |
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p->chset.client = emu->client; |
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#ifdef SNDRV_EMUX_USE_RAW_EFFECT |
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snd_emux_create_effect(p); |
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#endif |
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callback->private_free = free_port; |
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callback->private_data = p; |
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cap = SNDRV_SEQ_PORT_CAP_WRITE; |
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if (oss_port) { |
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type = SNDRV_SEQ_PORT_TYPE_SPECIFIC; |
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} else { |
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type = DEFAULT_MIDI_TYPE; |
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cap |= SNDRV_SEQ_PORT_CAP_SUBS_WRITE; |
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} |
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p->chset.port = snd_seq_event_port_attach(emu->client, callback, |
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cap, type, max_channels, |
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emu->max_voices, name); |
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return p; |
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} |
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/* |
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* release memory block for port |
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*/ |
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static void |
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free_port(void *private_data) |
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{ |
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struct snd_emux_port *p; |
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p = private_data; |
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if (p) { |
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#ifdef SNDRV_EMUX_USE_RAW_EFFECT |
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snd_emux_delete_effect(p); |
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#endif |
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kfree(p->chset.channels); |
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kfree(p); |
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} |
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} |
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#define DEFAULT_DRUM_FLAGS (1<<9) |
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/* |
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* initialize the port specific parameters |
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*/ |
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static void |
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snd_emux_init_port(struct snd_emux_port *p) |
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{ |
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p->drum_flags = DEFAULT_DRUM_FLAGS; |
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p->volume_atten = 0; |
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snd_emux_reset_port(p); |
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} |
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/* |
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* reset port |
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*/ |
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void |
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snd_emux_reset_port(struct snd_emux_port *port) |
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{ |
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int i; |
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/* stop all sounds */ |
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snd_emux_sounds_off_all(port); |
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snd_midi_channel_set_clear(&port->chset); |
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#ifdef SNDRV_EMUX_USE_RAW_EFFECT |
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snd_emux_clear_effect(port); |
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#endif |
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/* set port specific control parameters */ |
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port->ctrls[EMUX_MD_DEF_BANK] = 0; |
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port->ctrls[EMUX_MD_DEF_DRUM] = 0; |
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port->ctrls[EMUX_MD_REALTIME_PAN] = 1; |
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for (i = 0; i < port->chset.max_channels; i++) { |
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struct snd_midi_channel *chan = port->chset.channels + i; |
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chan->drum_channel = ((port->drum_flags >> i) & 1) ? 1 : 0; |
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} |
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} |
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/* |
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* input sequencer event |
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*/ |
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int |
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snd_emux_event_input(struct snd_seq_event *ev, int direct, void *private_data, |
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int atomic, int hop) |
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{ |
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struct snd_emux_port *port; |
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port = private_data; |
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if (snd_BUG_ON(!port || !ev)) |
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return -EINVAL; |
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snd_midi_process_event(&emux_ops, ev, &port->chset); |
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return 0; |
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} |
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/* |
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* increment usage count |
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*/ |
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static int |
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__snd_emux_inc_count(struct snd_emux *emu) |
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{ |
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emu->used++; |
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if (!try_module_get(emu->ops.owner)) |
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goto __error; |
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if (!try_module_get(emu->card->module)) { |
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module_put(emu->ops.owner); |
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__error: |
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emu->used--; |
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return 0; |
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} |
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return 1; |
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} |
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int snd_emux_inc_count(struct snd_emux *emu) |
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{ |
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int ret; |
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mutex_lock(&emu->register_mutex); |
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ret = __snd_emux_inc_count(emu); |
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mutex_unlock(&emu->register_mutex); |
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return ret; |
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} |
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/* |
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* decrease usage count |
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*/ |
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static void |
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__snd_emux_dec_count(struct snd_emux *emu) |
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{ |
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module_put(emu->card->module); |
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emu->used--; |
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if (emu->used <= 0) |
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snd_emux_terminate_all(emu); |
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module_put(emu->ops.owner); |
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} |
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void snd_emux_dec_count(struct snd_emux *emu) |
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{ |
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mutex_lock(&emu->register_mutex); |
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__snd_emux_dec_count(emu); |
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mutex_unlock(&emu->register_mutex); |
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} |
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/* |
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* Routine that is called upon a first use of a particular port |
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*/ |
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static int |
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snd_emux_use(void *private_data, struct snd_seq_port_subscribe *info) |
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{ |
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struct snd_emux_port *p; |
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struct snd_emux *emu; |
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p = private_data; |
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if (snd_BUG_ON(!p)) |
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return -EINVAL; |
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emu = p->emu; |
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if (snd_BUG_ON(!emu)) |
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return -EINVAL; |
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mutex_lock(&emu->register_mutex); |
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snd_emux_init_port(p); |
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__snd_emux_inc_count(emu); |
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mutex_unlock(&emu->register_mutex); |
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return 0; |
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} |
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/* |
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* Routine that is called upon the last unuse() of a particular port. |
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*/ |
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static int |
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snd_emux_unuse(void *private_data, struct snd_seq_port_subscribe *info) |
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{ |
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struct snd_emux_port *p; |
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struct snd_emux *emu; |
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p = private_data; |
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if (snd_BUG_ON(!p)) |
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return -EINVAL; |
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emu = p->emu; |
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if (snd_BUG_ON(!emu)) |
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return -EINVAL; |
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mutex_lock(&emu->register_mutex); |
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snd_emux_sounds_off_all(p); |
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__snd_emux_dec_count(emu); |
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mutex_unlock(&emu->register_mutex); |
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return 0; |
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} |
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/* |
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* attach virtual rawmidi devices |
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*/ |
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int snd_emux_init_virmidi(struct snd_emux *emu, struct snd_card *card) |
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{ |
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int i; |
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emu->vmidi = NULL; |
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if (emu->midi_ports <= 0) |
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return 0; |
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emu->vmidi = kcalloc(emu->midi_ports, sizeof(*emu->vmidi), GFP_KERNEL); |
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if (!emu->vmidi) |
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return -ENOMEM; |
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for (i = 0; i < emu->midi_ports; i++) { |
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struct snd_rawmidi *rmidi; |
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struct snd_virmidi_dev *rdev; |
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if (snd_virmidi_new(card, emu->midi_devidx + i, &rmidi) < 0) |
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goto __error; |
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rdev = rmidi->private_data; |
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sprintf(rmidi->name, "%s Synth MIDI", emu->name); |
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rdev->seq_mode = SNDRV_VIRMIDI_SEQ_ATTACH; |
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rdev->client = emu->client; |
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rdev->port = emu->ports[i]; |
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if (snd_device_register(card, rmidi) < 0) { |
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snd_device_free(card, rmidi); |
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goto __error; |
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} |
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emu->vmidi[i] = rmidi; |
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/* snd_printk(KERN_DEBUG "virmidi %d ok\n", i); */ |
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} |
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return 0; |
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__error: |
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/* snd_printk(KERN_DEBUG "error init..\n"); */ |
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snd_emux_delete_virmidi(emu); |
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return -ENOMEM; |
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} |
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int snd_emux_delete_virmidi(struct snd_emux *emu) |
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{ |
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int i; |
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if (!emu->vmidi) |
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return 0; |
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for (i = 0; i < emu->midi_ports; i++) { |
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if (emu->vmidi[i]) |
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snd_device_free(emu->card, emu->vmidi[i]); |
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} |
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kfree(emu->vmidi); |
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emu->vmidi = NULL; |
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return 0; |
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}
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