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 scoped_guard(mutex, &opl4->access_mutex) { 67 if (opl4->used) 68 return -EBUSY; 69 opl4->used++; 70 71 if (info->sender.client != SNDRV_SEQ_CLIENT_SYSTEM) { 72 err = snd_opl4_seq_use_inc(opl4); 73 if (err < 0) 74 return err; 75 } 76 } 77 78 snd_opl4_synth_reset(opl4); 79 return 0; 80 } 81 82 static int snd_opl4_seq_unuse(void *private_data, struct snd_seq_port_subscribe *info) 83 { 84 struct snd_opl4 *opl4 = private_data; 85 86 snd_opl4_synth_shutdown(opl4); 87 88 scoped_guard(mutex, &opl4->access_mutex) { 89 opl4->used--; 90 } 91 92 if (info->sender.client != SNDRV_SEQ_CLIENT_SYSTEM) 93 snd_opl4_seq_use_dec(opl4); 94 return 0; 95 } 96 97 static const struct snd_midi_op opl4_ops = { 98 .note_on = snd_opl4_note_on, 99 .note_off = snd_opl4_note_off, 100 .note_terminate = snd_opl4_terminate_note, 101 .control = snd_opl4_control, 102 .sysex = snd_opl4_sysex, 103 }; 104 105 static int snd_opl4_seq_event_input(struct snd_seq_event *ev, int direct, 106 void *private_data, int atomic, int hop) 107 { 108 struct snd_opl4 *opl4 = private_data; 109 110 snd_midi_process_event(&opl4_ops, ev, opl4->chset); 111 return 0; 112 } 113 114 static void snd_opl4_seq_free_port(void *private_data) 115 { 116 struct snd_opl4 *opl4 = private_data; 117 118 snd_midi_channel_free_set(opl4->chset); 119 } 120 121 static int snd_opl4_seq_probe(struct device *_dev) 122 { 123 struct snd_seq_device *dev = to_seq_dev(_dev); 124 struct snd_opl4 *opl4; 125 int client; 126 struct snd_seq_port_callback pcallbacks; 127 128 opl4 = *(struct snd_opl4 **)SNDRV_SEQ_DEVICE_ARGPTR(dev); 129 if (!opl4) 130 return -EINVAL; 131 132 if (snd_yrw801_detect(opl4) < 0) 133 return -ENODEV; 134 135 opl4->chset = snd_midi_channel_alloc_set(16); 136 if (!opl4->chset) 137 return -ENOMEM; 138 opl4->chset->private_data = opl4; 139 140 /* allocate new client */ 141 client = snd_seq_create_kernel_client(opl4->card, opl4->seq_dev_num, 142 "OPL4 Wavetable"); 143 if (client < 0) { 144 snd_midi_channel_free_set(opl4->chset); 145 return client; 146 } 147 opl4->seq_client = client; 148 opl4->chset->client = client; 149 150 /* create new port */ 151 memset(&pcallbacks, 0, sizeof(pcallbacks)); 152 pcallbacks.owner = THIS_MODULE; 153 pcallbacks.use = snd_opl4_seq_use; 154 pcallbacks.unuse = snd_opl4_seq_unuse; 155 pcallbacks.event_input = snd_opl4_seq_event_input; 156 pcallbacks.private_free = snd_opl4_seq_free_port; 157 pcallbacks.private_data = opl4; 158 159 opl4->chset->port = snd_seq_event_port_attach(client, &pcallbacks, 160 SNDRV_SEQ_PORT_CAP_WRITE | 161 SNDRV_SEQ_PORT_CAP_SUBS_WRITE, 162 SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC | 163 SNDRV_SEQ_PORT_TYPE_MIDI_GM | 164 SNDRV_SEQ_PORT_TYPE_HARDWARE | 165 SNDRV_SEQ_PORT_TYPE_SYNTHESIZER, 166 16, 24, 167 "OPL4 Wavetable Port"); 168 if (opl4->chset->port < 0) { 169 int err = opl4->chset->port; 170 snd_midi_channel_free_set(opl4->chset); 171 snd_seq_delete_kernel_client(client); 172 opl4->seq_client = -1; 173 return err; 174 } 175 return 0; 176 } 177 178 static int snd_opl4_seq_remove(struct device *_dev) 179 { 180 struct snd_seq_device *dev = to_seq_dev(_dev); 181 struct snd_opl4 *opl4; 182 183 opl4 = *(struct snd_opl4 **)SNDRV_SEQ_DEVICE_ARGPTR(dev); 184 if (!opl4) 185 return -EINVAL; 186 187 if (opl4->seq_client >= 0) { 188 snd_seq_delete_kernel_client(opl4->seq_client); 189 opl4->seq_client = -1; 190 } 191 return 0; 192 } 193 194 static struct snd_seq_driver opl4_seq_driver = { 195 .driver = { 196 .name = KBUILD_MODNAME, 197 .probe = snd_opl4_seq_probe, 198 .remove = snd_opl4_seq_remove, 199 }, 200 .id = SNDRV_SEQ_DEV_ID_OPL4, 201 .argsize = sizeof(struct snd_opl4 *), 202 }; 203 204 module_snd_seq_driver(opl4_seq_driver); 205