--- /dev/null
+/*
+ * OPL4 sequencer functions
+ *
+ * Copyright (c) 2003 by Clemens Ladisch <clemens@ladisch.de>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions, and the following disclaimer,
+ * without modification.
+ * 2. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed and/or modified 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 SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#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_probe(struct device *_dev)
+{
+ struct snd_seq_device *dev = to_seq_dev(_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_remove(struct device *_dev)
+{
+ struct snd_seq_device *dev = to_seq_dev(_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 struct snd_seq_driver opl4_seq_driver = {
+ .driver = {
+ .name = KBUILD_MODNAME,
+ .probe = snd_opl4_seq_probe,
+ .remove = snd_opl4_seq_remove,
+ },
+ .id = SNDRV_SEQ_DEV_ID_OPL4,
+ .argsize = sizeof(struct snd_opl4 *),
+};
+
+module_snd_seq_driver(opl4_seq_driver);
Code Review / kvmfornfv.git / blobdiff