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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
40MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
41MODULE_DESCRIPTION("OPL4 wavetable synth driver");
42MODULE_LICENSE("Dual BSD/GPL");
43
44int volume_boost = 8;
45
46module_param(volume_boost, int, 0644);
47MODULE_PARM_DESC(volume_boost, "Additional volume for OPL4 wavetable sounds.");
48
49static 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
56static void snd_opl4_seq_use_dec(struct snd_opl4 *opl4)
57{
58 module_put(opl4->card->module);
59}
60
61static 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
88static 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
103static 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
111static 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
120static 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
127static 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
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
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
183static 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
198static 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
209static void __exit alsa_opl4_synth_exit(void)
210{
211 snd_seq_device_unregister_driver(SNDRV_SEQ_DEV_ID_OPL4);
212}
213
214module_init(alsa_opl4_synth_init)
215module_exit(alsa_opl4_synth_exit)
216
