1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Midi Sequencer interface routines.
5 * Copyright (C) 1999 Steve Ratcliffe
6 * Copyright (c) 1999-2000 Takashi Iwai <tiwai@suse.de>
9 #include "emux_voice.h"
10 #include <linux/slab.h>
11 #include <linux/module.h>
13 /* Prototypes for static functions */
14 static void free_port(void *private);
15 static void snd_emux_init_port(struct snd_emux_port *p);
16 static int snd_emux_use(void *private_data, struct snd_seq_port_subscribe *info);
17 static int snd_emux_unuse(void *private_data, struct snd_seq_port_subscribe *info);
20 * MIDI emulation operators
22 static const struct snd_midi_op emux_ops = {
23 .note_on = snd_emux_note_on,
24 .note_off = snd_emux_note_off,
25 .key_press = snd_emux_key_press,
26 .note_terminate = snd_emux_terminate_note,
27 .control = snd_emux_control,
28 .nrpn = snd_emux_nrpn,
29 .sysex = snd_emux_sysex,
34 * number of MIDI channels
36 #define MIDI_CHANNELS 16
39 * type flags for MIDI sequencer port
41 #define DEFAULT_MIDI_TYPE (SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC |\
42 SNDRV_SEQ_PORT_TYPE_MIDI_GM |\
43 SNDRV_SEQ_PORT_TYPE_MIDI_GS |\
44 SNDRV_SEQ_PORT_TYPE_MIDI_XG |\
45 SNDRV_SEQ_PORT_TYPE_HARDWARE |\
46 SNDRV_SEQ_PORT_TYPE_SYNTHESIZER)
49 * Initialise the EMUX Synth by creating a client and registering
51 * Each of the ports will contain the 16 midi channels. Applications
52 * can connect to these ports to play midi data.
55 snd_emux_init_seq(struct snd_emux *emu, struct snd_card *card, int index)
58 struct snd_seq_port_callback pinfo;
61 emu->client = snd_seq_create_kernel_client(card, index,
62 "%s WaveTable", emu->name);
63 if (emu->client < 0) {
64 snd_printk(KERN_ERR "can't create client\n");
68 if (emu->num_ports < 0) {
69 snd_printk(KERN_WARNING "seqports must be greater than zero\n");
71 } else if (emu->num_ports >= SNDRV_EMUX_MAX_PORTS) {
72 snd_printk(KERN_WARNING "too many ports."
73 "limited max. ports %d\n", SNDRV_EMUX_MAX_PORTS);
74 emu->num_ports = SNDRV_EMUX_MAX_PORTS;
77 memset(&pinfo, 0, sizeof(pinfo));
78 pinfo.owner = THIS_MODULE;
79 pinfo.use = snd_emux_use;
80 pinfo.unuse = snd_emux_unuse;
81 pinfo.event_input = snd_emux_event_input;
83 for (i = 0; i < emu->num_ports; i++) {
84 struct snd_emux_port *p;
86 sprintf(tmpname, "%s Port %d", emu->name, i);
87 p = snd_emux_create_port(emu, tmpname, MIDI_CHANNELS,
90 snd_printk(KERN_ERR "can't create port\n");
94 p->port_mode = SNDRV_EMUX_PORT_MODE_MIDI;
95 snd_emux_init_port(p);
96 emu->ports[i] = p->chset.port;
105 * Detach from the ports that were set up for this synthesizer and
106 * destroy the kernel client.
109 snd_emux_detach_seq(struct snd_emux *emu)
112 snd_emux_terminate_all(emu);
114 if (emu->client >= 0) {
115 snd_seq_delete_kernel_client(emu->client);
122 * create a sequencer port and channel_set
125 struct snd_emux_port *
126 snd_emux_create_port(struct snd_emux *emu, char *name,
127 int max_channels, int oss_port,
128 struct snd_seq_port_callback *callback)
130 struct snd_emux_port *p;
133 /* Allocate structures for this channel */
134 p = kzalloc(sizeof(*p), GFP_KERNEL);
138 p->chset.channels = kcalloc(max_channels, sizeof(*p->chset.channels),
140 if (!p->chset.channels) {
144 for (i = 0; i < max_channels; i++)
145 p->chset.channels[i].number = i;
146 p->chset.private_data = p;
147 p->chset.max_channels = max_channels;
149 p->chset.client = emu->client;
150 #ifdef SNDRV_EMUX_USE_RAW_EFFECT
151 snd_emux_create_effect(p);
153 callback->private_free = free_port;
154 callback->private_data = p;
156 cap = SNDRV_SEQ_PORT_CAP_WRITE;
158 type = SNDRV_SEQ_PORT_TYPE_SPECIFIC;
160 type = DEFAULT_MIDI_TYPE;
161 cap |= SNDRV_SEQ_PORT_CAP_SUBS_WRITE;
164 p->chset.port = snd_seq_event_port_attach(emu->client, callback,
165 cap, type, max_channels,
166 emu->max_voices, name);
173 * release memory block for port
176 free_port(void *private_data)
178 struct snd_emux_port *p;
182 #ifdef SNDRV_EMUX_USE_RAW_EFFECT
183 snd_emux_delete_effect(p);
185 kfree(p->chset.channels);
191 #define DEFAULT_DRUM_FLAGS (1<<9)
194 * initialize the port specific parameters
197 snd_emux_init_port(struct snd_emux_port *p)
199 p->drum_flags = DEFAULT_DRUM_FLAGS;
202 snd_emux_reset_port(p);
210 snd_emux_reset_port(struct snd_emux_port *port)
214 /* stop all sounds */
215 snd_emux_sounds_off_all(port);
217 snd_midi_channel_set_clear(&port->chset);
219 #ifdef SNDRV_EMUX_USE_RAW_EFFECT
220 snd_emux_clear_effect(port);
223 /* set port specific control parameters */
224 port->ctrls[EMUX_MD_DEF_BANK] = 0;
225 port->ctrls[EMUX_MD_DEF_DRUM] = 0;
226 port->ctrls[EMUX_MD_REALTIME_PAN] = 1;
228 for (i = 0; i < port->chset.max_channels; i++) {
229 struct snd_midi_channel *chan = port->chset.channels + i;
230 chan->drum_channel = ((port->drum_flags >> i) & 1) ? 1 : 0;
236 * input sequencer event
239 snd_emux_event_input(struct snd_seq_event *ev, int direct, void *private_data,
242 struct snd_emux_port *port;
245 if (snd_BUG_ON(!port || !ev))
248 snd_midi_process_event(&emux_ops, ev, &port->chset);
255 * increment usage count
258 __snd_emux_inc_count(struct snd_emux *emu)
261 if (!try_module_get(emu->ops.owner))
263 if (!try_module_get(emu->card->module)) {
264 module_put(emu->ops.owner);
272 int snd_emux_inc_count(struct snd_emux *emu)
276 mutex_lock(&emu->register_mutex);
277 ret = __snd_emux_inc_count(emu);
278 mutex_unlock(&emu->register_mutex);
283 * decrease usage count
286 __snd_emux_dec_count(struct snd_emux *emu)
288 module_put(emu->card->module);
291 snd_emux_terminate_all(emu);
292 module_put(emu->ops.owner);
295 void snd_emux_dec_count(struct snd_emux *emu)
297 mutex_lock(&emu->register_mutex);
298 __snd_emux_dec_count(emu);
299 mutex_unlock(&emu->register_mutex);
303 * Routine that is called upon a first use of a particular port
306 snd_emux_use(void *private_data, struct snd_seq_port_subscribe *info)
308 struct snd_emux_port *p;
309 struct snd_emux *emu;
315 if (snd_BUG_ON(!emu))
318 mutex_lock(&emu->register_mutex);
319 snd_emux_init_port(p);
320 __snd_emux_inc_count(emu);
321 mutex_unlock(&emu->register_mutex);
326 * Routine that is called upon the last unuse() of a particular port.
329 snd_emux_unuse(void *private_data, struct snd_seq_port_subscribe *info)
331 struct snd_emux_port *p;
332 struct snd_emux *emu;
338 if (snd_BUG_ON(!emu))
341 mutex_lock(&emu->register_mutex);
342 snd_emux_sounds_off_all(p);
343 __snd_emux_dec_count(emu);
344 mutex_unlock(&emu->register_mutex);
350 * attach virtual rawmidi devices
352 int snd_emux_init_virmidi(struct snd_emux *emu, struct snd_card *card)
357 if (emu->midi_ports <= 0)
360 emu->vmidi = kcalloc(emu->midi_ports, sizeof(*emu->vmidi), GFP_KERNEL);
364 for (i = 0; i < emu->midi_ports; i++) {
365 struct snd_rawmidi *rmidi;
366 struct snd_virmidi_dev *rdev;
367 if (snd_virmidi_new(card, emu->midi_devidx + i, &rmidi) < 0)
369 rdev = rmidi->private_data;
370 sprintf(rmidi->name, "%s Synth MIDI", emu->name);
371 rdev->seq_mode = SNDRV_VIRMIDI_SEQ_ATTACH;
372 rdev->client = emu->client;
373 rdev->port = emu->ports[i];
374 if (snd_device_register(card, rmidi) < 0) {
375 snd_device_free(card, rmidi);
378 emu->vmidi[i] = rmidi;
379 /* snd_printk(KERN_DEBUG "virmidi %d ok\n", i); */
384 /* snd_printk(KERN_DEBUG "error init..\n"); */
385 snd_emux_delete_virmidi(emu);
389 int snd_emux_delete_virmidi(struct snd_emux *emu)
396 for (i = 0; i < emu->midi_ports; i++) {
398 snd_device_free(emu->card, emu->vmidi[i]);