1 /* 2 * OPL4 sequencer functions 3 * 4 * Copyright (c) 2003 by Clemens Ladisch <clemens@ladisch.de> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions, and the following disclaimer, 12 * without modification. 13 * 2. The name of the author may not be used to endorse or promote products 14 * derived from this software without specific prior written permission. 15 * 16 * Alternatively, this software may be distributed and/or modified under the 17 * terms of the GNU General Public License as published by the Free Software 18 * Foundation; either version 2 of the License, or (at your option) any later 19 * version. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 25 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include "opl4_local.h" 35 #include <linux/init.h> 36 #include <linux/moduleparam.h> 37 #include <sound/initval.h> 38 39 MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>"); 40 MODULE_DESCRIPTION("OPL4 wavetable synth driver"); 41 MODULE_LICENSE("Dual BSD/GPL"); 42 43 int volume_boost = 8; 44 45 module_param(volume_boost, int, 0644); 46 MODULE_PARM_DESC(volume_boost, "Additional volume for OPL4 wavetable sounds."); 47 48 static int snd_opl4_seq_use_inc(struct snd_opl4 *opl4) 49 { 50 if (!try_module_get(opl4->card->module)) 51 return -EFAULT; 52 return 0; 53 } 54 55 static void snd_opl4_seq_use_dec(struct snd_opl4 *opl4) 56 { 57 module_put(opl4->card->module); 58 } 59 60 static int snd_opl4_seq_use(void *private_data, struct snd_seq_port_subscribe *info) 61 { 62 struct snd_opl4 *opl4 = private_data; 63 int err; 64 65 mutex_lock(&opl4->access_mutex); 66 67 if (opl4->used) { 68 mutex_unlock(&opl4->access_mutex); 69 return -EBUSY; 70 } 71 opl4->used++; 72 73 if (info->sender.client != SNDRV_SEQ_CLIENT_SYSTEM) { 74 err = snd_opl4_seq_use_inc(opl4); 75 if (err < 0) { 76 mutex_unlock(&opl4->access_mutex); 77 return err; 78 } 79 } 80 81 mutex_unlock(&opl4->access_mutex); 82 83 snd_opl4_synth_reset(opl4); 84 return 0; 85 } 86 87 static int snd_opl4_seq_unuse(void *private_data, struct snd_seq_port_subscribe *info) 88 { 89 struct snd_opl4 *opl4 = private_data; 90 91 snd_opl4_synth_shutdown(opl4); 92 93 mutex_lock(&opl4->access_mutex); 94 opl4->used--; 95 mutex_unlock(&opl4->access_mutex); 96 97 if (info->sender.client != SNDRV_SEQ_CLIENT_SYSTEM) 98 snd_opl4_seq_use_dec(opl4); 99 return 0; 100 } 101 102 static struct snd_midi_op opl4_ops = { 103 .note_on = snd_opl4_note_on, 104 .note_off = snd_opl4_note_off, 105 .note_terminate = snd_opl4_terminate_note, 106 .control = snd_opl4_control, 107 .sysex = snd_opl4_sysex, 108 }; 109 110 static int snd_opl4_seq_event_input(struct snd_seq_event *ev, int direct, 111 void *private_data, int atomic, int hop) 112 { 113 struct snd_opl4 *opl4 = private_data; 114 115 snd_midi_process_event(&opl4_ops, ev, opl4->chset); 116 return 0; 117 } 118 119 static void snd_opl4_seq_free_port(void *private_data) 120 { 121 struct snd_opl4 *opl4 = private_data; 122 123 snd_midi_channel_free_set(opl4->chset); 124 } 125 126 static int snd_opl4_seq_new_device(struct snd_seq_device *dev) 127 { 128 struct snd_opl4 *opl4; 129 int client; 130 struct snd_seq_port_callback pcallbacks; 131 132 opl4 = *(struct snd_opl4 **)SNDRV_SEQ_DEVICE_ARGPTR(dev); 133 if (!opl4) 134 return -EINVAL; 135 136 if (snd_yrw801_detect(opl4) < 0) 137 return -ENODEV; 138 139 opl4->chset = snd_midi_channel_alloc_set(16); 140 if (!opl4->chset) 141 return -ENOMEM; 142 opl4->chset->private_data = opl4; 143 144 /* allocate new client */ 145 client = snd_seq_create_kernel_client(opl4->card, opl4->seq_dev_num, 146 "OPL4 Wavetable"); 147 if (client < 0) { 148 snd_midi_channel_free_set(opl4->chset); 149 return client; 150 } 151 opl4->seq_client = client; 152 opl4->chset->client = client; 153 154 /* create new port */ 155 memset(&pcallbacks, 0, sizeof(pcallbacks)); 156 pcallbacks.owner = THIS_MODULE; 157 pcallbacks.use = snd_opl4_seq_use; 158 pcallbacks.unuse = snd_opl4_seq_unuse; 159 pcallbacks.event_input = snd_opl4_seq_event_input; 160 pcallbacks.private_free = snd_opl4_seq_free_port; 161 pcallbacks.private_data = opl4; 162 163 opl4->chset->port = snd_seq_event_port_attach(client, &pcallbacks, 164 SNDRV_SEQ_PORT_CAP_WRITE | 165 SNDRV_SEQ_PORT_CAP_SUBS_WRITE, 166 SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC | 167 SNDRV_SEQ_PORT_TYPE_MIDI_GM | 168 SNDRV_SEQ_PORT_TYPE_HARDWARE | 169 SNDRV_SEQ_PORT_TYPE_SYNTHESIZER, 170 16, 24, 171 "OPL4 Wavetable Port"); 172 if (opl4->chset->port < 0) { 173 int err = opl4->chset->port; 174 snd_midi_channel_free_set(opl4->chset); 175 snd_seq_delete_kernel_client(client); 176 opl4->seq_client = -1; 177 return err; 178 } 179 return 0; 180 } 181 182 static int snd_opl4_seq_delete_device(struct snd_seq_device *dev) 183 { 184 struct snd_opl4 *opl4; 185 186 opl4 = *(struct snd_opl4 **)SNDRV_SEQ_DEVICE_ARGPTR(dev); 187 if (!opl4) 188 return -EINVAL; 189 190 if (opl4->seq_client >= 0) { 191 snd_seq_delete_kernel_client(opl4->seq_client); 192 opl4->seq_client = -1; 193 } 194 return 0; 195 } 196 197 static int __init alsa_opl4_synth_init(void) 198 { 199 static struct snd_seq_dev_ops ops = { 200 snd_opl4_seq_new_device, 201 snd_opl4_seq_delete_device 202 }; 203 204 return snd_seq_device_register_driver(SNDRV_SEQ_DEV_ID_OPL4, &ops, 205 sizeof(struct snd_opl4 *)); 206 } 207 208 static void __exit alsa_opl4_synth_exit(void) 209 { 210 snd_seq_device_unregister_driver(SNDRV_SEQ_DEV_ID_OPL4); 211 } 212 213 module_init(alsa_opl4_synth_init) 214 module_exit(alsa_opl4_synth_exit) 215