--- /dev/null
+/*
+ * Midi Sequencer interface routines.
+ *
+ * Copyright (C) 1999 Steve Ratcliffe
+ * Copyright (c) 1999-2000 Takashi Iwai <tiwai@suse.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#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 struct snd_midi_op emux_ops = {
+ snd_emux_note_on,
+ snd_emux_note_off,
+ snd_emux_key_press,
+ snd_emux_terminate_note,
+ snd_emux_control,
+ snd_emux_nrpn,
+ 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 == NULL) {
+ 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 */
+ if ((p = kzalloc(sizeof(*p), GFP_KERNEL)) == NULL) {
+ snd_printk(KERN_ERR "no memory\n");
+ return NULL;
+ }
+ p->chset.channels = kcalloc(max_channels, sizeof(struct snd_midi_channel), GFP_KERNEL);
+ if (p->chset.channels == NULL) {
+ snd_printk(KERN_ERR "no memory\n");
+ 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(struct snd_rawmidi *), GFP_KERNEL);
+ if (emu->vmidi == NULL)
+ 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 == NULL)
+ 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;
+}
Code Review / kvmfornfv.git / blobdiff