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 <linux/module.h> 38 #include <sound/initval.h> 39 40 MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>"); 41 MODULE_DESCRIPTION("OPL4 wavetable synth driver"); 42 MODULE_LICENSE("Dual BSD/GPL"); 43 44 int volume_boost = 8; 45 46 module_param(volume_boost, int, 0644); 47 MODULE_PARM_DESC(volume_boost, "Additional volume for OPL4 wavetable sounds."); 48 49 static int snd_opl4_seq_use_inc(struct snd_opl4 *opl4) 50 { 51 if (!try_module_get(opl4->card->module)) 52 return -EFAULT; 53 return 0; 54 } 55 56 static void snd_opl4_seq_use_dec(struct snd_opl4 *opl4) 57 { 58 module_put(opl4->card->module); 59 } 60 61 static int snd_opl4_seq_use(void *private_data, struct snd_seq_port_subscribe *info) 62 { 63 struct snd_opl4 *opl4 = private_data; 64 int err; 65 66 mutex_lock(&opl4->access_mutex); 67 68 if (opl4->used) { 69 mutex_unlock(&opl4->access_mutex); 70 return -EBUSY; 71 } 72 opl4->used++; 73 74 if (info->sender.client != SNDRV_SEQ_CLIENT_SYSTEM) { 75 err = snd_opl4_seq_use_inc(opl4); 76 if (err < 0) { 77 mutex_unlock(&opl4->access_mutex); 78 return err; 79 } 80 } 81 82 mutex_unlock(&opl4->access_mutex); 83 84 snd_opl4_synth_reset(opl4); 85 return 0; 86 } 87 88 static int snd_opl4_seq_unuse(void *private_data, struct snd_seq_port_subscribe *info) 89 { 90 struct snd_opl4 *opl4 = private_data; 91 92 snd_opl4_synth_shutdown(opl4); 93 94 mutex_lock(&opl4->access_mutex); 95 opl4->used--; 96 mutex_unlock(&opl4->access_mutex); 97 98 if (info->sender.client != SNDRV_SEQ_CLIENT_SYSTEM) 99 snd_opl4_seq_use_dec(opl4); 100 return 0; 101 } 102 103 static struct snd_midi_op opl4_ops = { 104 .note_on = snd_opl4_note_on, 105 .note_off = snd_opl4_note_off, 106 .note_terminate = snd_opl4_terminate_note, 107 .control = snd_opl4_control, 108 .sysex = snd_opl4_sysex, 109 }; 110 111 static int snd_opl4_seq_event_input(struct snd_seq_event *ev, int direct, 112 void *private_data, int atomic, int hop) 113 { 114 struct snd_opl4 *opl4 = private_data; 115 116 snd_midi_process_event(&opl4_ops, ev, opl4->chset); 117 return 0; 118 } 119 120 static void snd_opl4_seq_free_port(void *private_data) 121 { 122 struct snd_opl4 *opl4 = private_data; 123 124 snd_midi_channel_free_set(opl4->chset); 125 } 126 127 static int snd_opl4_seq_new_device(struct snd_seq_device *dev) 128 { 129 struct snd_opl4 *opl4; 130 int client; 131 struct snd_seq_port_callback pcallbacks; 132 133 opl4 = *(struct snd_opl4 **)SNDRV_SEQ_DEVICE_ARGPTR(dev); 134 if (!opl4) 135 return -EINVAL; 136 137 if (snd_yrw801_detect(opl4) < 0) 138 return -ENODEV; 139 140 opl4->chset = snd_midi_channel_alloc_set(16); 141 if (!opl4->chset) 142 return -ENOMEM; 143 opl4->chset->private_data = opl4; 144 145 /* allocate new client */ 146 client = snd_seq_create_kernel_client(opl4->card, opl4->seq_dev_num, 147 "OPL4 Wavetable"); 148 if (client < 0) { 149 snd_midi_channel_free_set(opl4->chset); 150 return client; 151 } 152 opl4->seq_client = client; 153 opl4->chset->client = client; 154 155 /* create new port */ 156 memset(&pcallbacks, 0, sizeof(pcallbacks)); 157 pcallbacks.owner = THIS_MODULE; 158 pcallbacks.use = snd_opl4_seq_use; 159 pcallbacks.unuse = snd_opl4_seq_unuse; 160 pcallbacks.event_input = snd_opl4_seq_event_input; 161 pcallbacks.private_free = snd_opl4_seq_free_port; 162 pcallbacks.private_data = opl4; 163 164 opl4->chset->port = snd_seq_event_port_attach(client, &pcallbacks, 165 SNDRV_SEQ_PORT_CAP_WRITE | 166 SNDRV_SEQ_PORT_CAP_SUBS_WRITE, 167 SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC | 168 SNDRV_SEQ_PORT_TYPE_MIDI_GM | 169 SNDRV_SEQ_PORT_TYPE_HARDWARE | 170 SNDRV_SEQ_PORT_TYPE_SYNTHESIZER, 171 16, 24, 172 "OPL4 Wavetable Port"); 173 if (opl4->chset->port < 0) { 174 int err = opl4->chset->port; 175 snd_midi_channel_free_set(opl4->chset); 176 snd_seq_delete_kernel_client(client); 177 opl4->seq_client = -1; 178 return err; 179 } 180 return 0; 181 } 182 183 static int snd_opl4_seq_delete_device(struct snd_seq_device *dev) 184 { 185 struct snd_opl4 *opl4; 186 187 opl4 = *(struct snd_opl4 **)SNDRV_SEQ_DEVICE_ARGPTR(dev); 188 if (!opl4) 189 return -EINVAL; 190 191 if (opl4->seq_client >= 0) { 192 snd_seq_delete_kernel_client(opl4->seq_client); 193 opl4->seq_client = -1; 194 } 195 return 0; 196 } 197 198 static int __init alsa_opl4_synth_init(void) 199 { 200 static struct snd_seq_dev_ops ops = { 201 snd_opl4_seq_new_device, 202 snd_opl4_seq_delete_device 203 }; 204 205 return snd_seq_device_register_driver(SNDRV_SEQ_DEV_ID_OPL4, &ops, 206 sizeof(struct snd_opl4 *)); 207 } 208 209 static void __exit alsa_opl4_synth_exit(void) 210 { 211 snd_seq_device_unregister_driver(SNDRV_SEQ_DEV_ID_OPL4); 212 } 213 214 module_init(alsa_opl4_synth_init) 215 module_exit(alsa_opl4_synth_exit) 216