1 files changed, 403 insertions, 0 deletions

diff --git a/sound/synth/emux/emux_seq.c b/sound/synth/emux/emux_seq.c
new file mode 100644
index 0000000000..b227c7e0bc
--- /dev/null
+++ b/sound/synth/emux/emux_seq.c
@@ -0,0 +1,403 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  Midi Sequencer interface routines.
+ *
+ *  Copyright (C) 1999 Steve Ratcliffe
+ *  Copyright (c) 1999-2000 Takashi Iwai <tiwai@suse.de>
+ */
+
+#include "emux_voice.h"
+#include <linux/slab.h>
+#include <linux/module.h>
+
+/* Prototypes for static functions */
+static void free_port(void *private);
+static void snd_emux_init_port(struct snd_emux_port *p);
+static int snd_emux_use(void *private_data, struct snd_seq_port_subscribe *info);
+static int snd_emux_unuse(void *private_data, struct snd_seq_port_subscribe *info);
+
+/*
+ * MIDI emulation operators
+ */
+static const struct snd_midi_op emux_ops = {
+	.note_on = snd_emux_note_on,
+	.note_off = snd_emux_note_off,
+	.key_press = snd_emux_key_press,
+	.note_terminate = snd_emux_terminate_note,
+	.control = snd_emux_control,
+	.nrpn = snd_emux_nrpn,
+	.sysex = snd_emux_sysex,
+};
+
+
+/*
+ * number of MIDI channels
+ */
+#define MIDI_CHANNELS		16
+
+/*
+ * type flags for MIDI sequencer port
+ */
+#define DEFAULT_MIDI_TYPE	(SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC |\
+				 SNDRV_SEQ_PORT_TYPE_MIDI_GM |\
+				 SNDRV_SEQ_PORT_TYPE_MIDI_GS |\
+				 SNDRV_SEQ_PORT_TYPE_MIDI_XG |\
+				 SNDRV_SEQ_PORT_TYPE_HARDWARE |\
+				 SNDRV_SEQ_PORT_TYPE_SYNTHESIZER)
+
+/*
+ * Initialise the EMUX Synth by creating a client and registering
+ * a series of ports.
+ * Each of the ports will contain the 16 midi channels.  Applications
+ * can connect to these ports to play midi data.
+ */
+int
+snd_emux_init_seq(struct snd_emux *emu, struct snd_card *card, int index)
+{
+	int  i;
+	struct snd_seq_port_callback pinfo;
+	char tmpname[64];
+
+	emu->client = snd_seq_create_kernel_client(card, index,
+						   "%s WaveTable", emu->name);
+	if (emu->client < 0) {
+		snd_printk(KERN_ERR "can't create client\n");
+		return -ENODEV;
+	}
+
+	if (emu->num_ports < 0) {
+		snd_printk(KERN_WARNING "seqports must be greater than zero\n");
+		emu->num_ports = 1;
+	} else if (emu->num_ports >= SNDRV_EMUX_MAX_PORTS) {
+		snd_printk(KERN_WARNING "too many ports."
+			   "limited max. ports %d\n", SNDRV_EMUX_MAX_PORTS);
+		emu->num_ports = SNDRV_EMUX_MAX_PORTS;
+	}
+
+	memset(&pinfo, 0, sizeof(pinfo));
+	pinfo.owner = THIS_MODULE;
+	pinfo.use = snd_emux_use;
+	pinfo.unuse = snd_emux_unuse;
+	pinfo.event_input = snd_emux_event_input;
+
+	for (i = 0; i < emu->num_ports; i++) {
+		struct snd_emux_port *p;
+
+		sprintf(tmpname, "%s Port %d", emu->name, i);
+		p = snd_emux_create_port(emu, tmpname, MIDI_CHANNELS,
+					 0, &pinfo);
+		if (!p) {
+			snd_printk(KERN_ERR "can't create port\n");
+			return -ENOMEM;
+		}
+
+		p->port_mode =  SNDRV_EMUX_PORT_MODE_MIDI;
+		snd_emux_init_port(p);
+		emu->ports[i] = p->chset.port;
+		emu->portptrs[i] = p;
+	}
+
+	return 0;
+}
+
+
+/*
+ * Detach from the ports that were set up for this synthesizer and
+ * destroy the kernel client.
+ */
+void
+snd_emux_detach_seq(struct snd_emux *emu)
+{
+	if (emu->voices)
+		snd_emux_terminate_all(emu);
+		
+	if (emu->client >= 0) {
+		snd_seq_delete_kernel_client(emu->client);
+		emu->client = -1;
+	}
+}
+
+
+/*
+ * create a sequencer port and channel_set
+ */
+
+struct snd_emux_port *
+snd_emux_create_port(struct snd_emux *emu, char *name,
+		     int max_channels, int oss_port,
+		     struct snd_seq_port_callback *callback)
+{
+	struct snd_emux_port *p;
+	int i, type, cap;
+
+	/* Allocate structures for this channel */
+	p = kzalloc(sizeof(*p), GFP_KERNEL);
+	if (!p)
+		return NULL;
+
+	p->chset.channels = kcalloc(max_channels, sizeof(*p->chset.channels),
+				    GFP_KERNEL);
+	if (!p->chset.channels) {
+		kfree(p);
+		return NULL;
+	}
+	for (i = 0; i < max_channels; i++)
+		p->chset.channels[i].number = i;
+	p->chset.private_data = p;
+	p->chset.max_channels = max_channels;
+	p->emu = emu;
+	p->chset.client = emu->client;
+#ifdef SNDRV_EMUX_USE_RAW_EFFECT
+	snd_emux_create_effect(p);
+#endif
+	callback->private_free = free_port;
+	callback->private_data = p;
+
+	cap = SNDRV_SEQ_PORT_CAP_WRITE;
+	if (oss_port) {
+		type = SNDRV_SEQ_PORT_TYPE_SPECIFIC;
+	} else {
+		type = DEFAULT_MIDI_TYPE;
+		cap |= SNDRV_SEQ_PORT_CAP_SUBS_WRITE;
+	}
+
+	p->chset.port = snd_seq_event_port_attach(emu->client, callback,
+						  cap, type, max_channels,
+						  emu->max_voices, name);
+
+	return p;
+}
+
+
+/*
+ * release memory block for port
+ */
+static void
+free_port(void *private_data)
+{
+	struct snd_emux_port *p;
+
+	p = private_data;
+	if (p) {
+#ifdef SNDRV_EMUX_USE_RAW_EFFECT
+		snd_emux_delete_effect(p);
+#endif
+		kfree(p->chset.channels);
+		kfree(p);
+	}
+}
+
+
+#define DEFAULT_DRUM_FLAGS	(1<<9)
+
+/*
+ * initialize the port specific parameters
+ */
+static void
+snd_emux_init_port(struct snd_emux_port *p)
+{
+	p->drum_flags = DEFAULT_DRUM_FLAGS;
+	p->volume_atten = 0;
+
+	snd_emux_reset_port(p);
+}
+
+
+/*
+ * reset port
+ */
+void
+snd_emux_reset_port(struct snd_emux_port *port)
+{
+	int i;
+
+	/* stop all sounds */
+	snd_emux_sounds_off_all(port);
+
+	snd_midi_channel_set_clear(&port->chset);
+
+#ifdef SNDRV_EMUX_USE_RAW_EFFECT
+	snd_emux_clear_effect(port);
+#endif
+
+	/* set port specific control parameters */
+	port->ctrls[EMUX_MD_DEF_BANK] = 0;
+	port->ctrls[EMUX_MD_DEF_DRUM] = 0;
+	port->ctrls[EMUX_MD_REALTIME_PAN] = 1;
+
+	for (i = 0; i < port->chset.max_channels; i++) {
+		struct snd_midi_channel *chan = port->chset.channels + i;
+		chan->drum_channel = ((port->drum_flags >> i) & 1) ? 1 : 0;
+	}
+}
+
+
+/*
+ * input sequencer event
+ */
+int
+snd_emux_event_input(struct snd_seq_event *ev, int direct, void *private_data,
+		     int atomic, int hop)
+{
+	struct snd_emux_port *port;
+
+	port = private_data;
+	if (snd_BUG_ON(!port || !ev))
+		return -EINVAL;
+
+	snd_midi_process_event(&emux_ops, ev, &port->chset);
+
+	return 0;
+}
+
+
+/*
+ * increment usage count
+ */
+static int
+__snd_emux_inc_count(struct snd_emux *emu)
+{
+	emu->used++;
+	if (!try_module_get(emu->ops.owner))
+		goto __error;
+	if (!try_module_get(emu->card->module)) {
+		module_put(emu->ops.owner);
+	      __error:
+		emu->used--;
+		return 0;
+	}
+	return 1;
+}
+
+int snd_emux_inc_count(struct snd_emux *emu)
+{
+	int ret;
+
+	mutex_lock(&emu->register_mutex);
+	ret = __snd_emux_inc_count(emu);
+	mutex_unlock(&emu->register_mutex);
+	return ret;
+}
+
+/*
+ * decrease usage count
+ */
+static void
+__snd_emux_dec_count(struct snd_emux *emu)
+{
+	module_put(emu->card->module);
+	emu->used--;
+	if (emu->used <= 0)
+		snd_emux_terminate_all(emu);
+	module_put(emu->ops.owner);
+}
+
+void snd_emux_dec_count(struct snd_emux *emu)
+{
+	mutex_lock(&emu->register_mutex);
+	__snd_emux_dec_count(emu);
+	mutex_unlock(&emu->register_mutex);
+}
+
+/*
+ * Routine that is called upon a first use of a particular port
+ */
+static int
+snd_emux_use(void *private_data, struct snd_seq_port_subscribe *info)
+{
+	struct snd_emux_port *p;
+	struct snd_emux *emu;
+
+	p = private_data;
+	if (snd_BUG_ON(!p))
+		return -EINVAL;
+	emu = p->emu;
+	if (snd_BUG_ON(!emu))
+		return -EINVAL;
+
+	mutex_lock(&emu->register_mutex);
+	snd_emux_init_port(p);
+	__snd_emux_inc_count(emu);
+	mutex_unlock(&emu->register_mutex);
+	return 0;
+}
+
+/*
+ * Routine that is called upon the last unuse() of a particular port.
+ */
+static int
+snd_emux_unuse(void *private_data, struct snd_seq_port_subscribe *info)
+{
+	struct snd_emux_port *p;
+	struct snd_emux *emu;
+
+	p = private_data;
+	if (snd_BUG_ON(!p))
+		return -EINVAL;
+	emu = p->emu;
+	if (snd_BUG_ON(!emu))
+		return -EINVAL;
+
+	mutex_lock(&emu->register_mutex);
+	snd_emux_sounds_off_all(p);
+	__snd_emux_dec_count(emu);
+	mutex_unlock(&emu->register_mutex);
+	return 0;
+}
+
+
+/*
+ * attach virtual rawmidi devices
+ */
+int snd_emux_init_virmidi(struct snd_emux *emu, struct snd_card *card)
+{
+	int i;
+
+	emu->vmidi = NULL;
+	if (emu->midi_ports <= 0)
+		return 0;
+
+	emu->vmidi = kcalloc(emu->midi_ports, sizeof(*emu->vmidi), GFP_KERNEL);
+	if (!emu->vmidi)
+		return -ENOMEM;
+
+	for (i = 0; i < emu->midi_ports; i++) {
+		struct snd_rawmidi *rmidi;
+		struct snd_virmidi_dev *rdev;
+		if (snd_virmidi_new(card, emu->midi_devidx + i, &rmidi) < 0)
+			goto __error;
+		rdev = rmidi->private_data;
+		sprintf(rmidi->name, "%s Synth MIDI", emu->name);
+		rdev->seq_mode = SNDRV_VIRMIDI_SEQ_ATTACH;
+		rdev->client = emu->client;
+		rdev->port = emu->ports[i];
+		if (snd_device_register(card, rmidi) < 0) {
+			snd_device_free(card, rmidi);
+			goto __error;
+		}
+		emu->vmidi[i] = rmidi;
+		/* snd_printk(KERN_DEBUG "virmidi %d ok\n", i); */
+	}
+	return 0;
+
+__error:
+	/* snd_printk(KERN_DEBUG "error init..\n"); */
+	snd_emux_delete_virmidi(emu);
+	return -ENOMEM;
+}
+
+int snd_emux_delete_virmidi(struct snd_emux *emu)
+{
+	int i;
+
+	if (!emu->vmidi)
+		return 0;
+
+	for (i = 0; i < emu->midi_ports; i++) {
+		if (emu->vmidi[i])
+			snd_device_free(emu->card, emu->vmidi[i]);
+	}
+	kfree(emu->vmidi);
+	emu->vmidi = NULL;
+	return 0;
+}