1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Interface for OSS sequencer emulation
4 *
5 * Copyright (C) 2000 Uros Bizjak <uros@kss-loka.si>
6 */
7
8 #include <linux/export.h>
9 #include "opl3_voice.h"
10
11 static int snd_opl3_open_seq_oss(struct snd_seq_oss_arg *arg, void *closure);
12 static int snd_opl3_close_seq_oss(struct snd_seq_oss_arg *arg);
13 static int snd_opl3_ioctl_seq_oss(struct snd_seq_oss_arg *arg, unsigned int cmd, unsigned long ioarg);
14 static int snd_opl3_load_patch_seq_oss(struct snd_seq_oss_arg *arg, int format, const char __user *buf, int offs, int count);
15 static int snd_opl3_reset_seq_oss(struct snd_seq_oss_arg *arg);
16
17 /* operators */
18
19 static const struct snd_seq_oss_callback oss_callback = {
20 .owner = THIS_MODULE,
21 .open = snd_opl3_open_seq_oss,
22 .close = snd_opl3_close_seq_oss,
23 .ioctl = snd_opl3_ioctl_seq_oss,
24 .load_patch = snd_opl3_load_patch_seq_oss,
25 .reset = snd_opl3_reset_seq_oss,
26 };
27
28 static int snd_opl3_oss_event_input(struct snd_seq_event *ev, int direct,
29 void *private_data, int atomic, int hop)
30 {
31 struct snd_opl3 *opl3 = private_data;
32
33 if (ev->type != SNDRV_SEQ_EVENT_OSS)
34 snd_midi_process_event(&opl3_ops, ev, opl3->oss_chset);
35 return 0;
36 }
37
38 /* ------------------------------ */
39
40 static void snd_opl3_oss_free_port(void *private_data)
41 {
42 struct snd_opl3 *opl3 = private_data;
43
44 snd_midi_channel_free_set(opl3->oss_chset);
45 }
46
47 static int snd_opl3_oss_create_port(struct snd_opl3 * opl3)
48 {
49 struct snd_seq_port_callback callbacks;
50 char name[32];
51 int voices, opl_ver;
52
53 voices = (opl3->hardware < OPL3_HW_OPL3) ?
54 MAX_OPL2_VOICES : MAX_OPL3_VOICES;
55 opl3->oss_chset = snd_midi_channel_alloc_set(voices);
56 if (opl3->oss_chset == NULL)
57 return -ENOMEM;
58 opl3->oss_chset->private_data = opl3;
59
60 memset(&callbacks, 0, sizeof(callbacks));
61 callbacks.owner = THIS_MODULE;
62 callbacks.event_input = snd_opl3_oss_event_input;
63 callbacks.private_free = snd_opl3_oss_free_port;
64 callbacks.private_data = opl3;
65
66 opl_ver = (opl3->hardware & OPL3_HW_MASK) >> 8;
67 sprintf(name, "OPL%i OSS Port", opl_ver);
68
69 opl3->oss_chset->client = opl3->seq_client;
70 opl3->oss_chset->port = snd_seq_event_port_attach(opl3->seq_client, &callbacks,
71 SNDRV_SEQ_PORT_CAP_WRITE,
72 SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC |
73 SNDRV_SEQ_PORT_TYPE_MIDI_GM |
74 SNDRV_SEQ_PORT_TYPE_HARDWARE |
75 SNDRV_SEQ_PORT_TYPE_SYNTHESIZER,
76 voices, voices,
77 name);
78 if (opl3->oss_chset->port < 0) {
79 int port;
80 port = opl3->oss_chset->port;
81 snd_midi_channel_free_set(opl3->oss_chset);
82 return port;
83 }
84 return 0;
85 }
86
87 /* ------------------------------ */
88
89 /* register OSS synth */
90 void snd_opl3_init_seq_oss(struct snd_opl3 *opl3, char *name)
91 {
92 struct snd_seq_oss_reg *arg;
93 struct snd_seq_device *dev;
94
95 if (snd_seq_device_new(opl3->card, 0, SNDRV_SEQ_DEV_ID_OSS,
96 sizeof(struct snd_seq_oss_reg), &dev) < 0)
97 return;
98
99 opl3->oss_seq_dev = dev;
100 strscpy(dev->name, name, sizeof(dev->name));
101 arg = SNDRV_SEQ_DEVICE_ARGPTR(dev);
102 arg->type = SYNTH_TYPE_FM;
103 if (opl3->hardware < OPL3_HW_OPL3) {
104 arg->subtype = FM_TYPE_ADLIB;
105 arg->nvoices = MAX_OPL2_VOICES;
106 } else {
107 arg->subtype = FM_TYPE_OPL3;
108 arg->nvoices = MAX_OPL3_VOICES;
109 }
110 arg->oper = oss_callback;
111 arg->private_data = opl3;
112
113 if (snd_opl3_oss_create_port(opl3)) {
114 /* register to OSS synth table */
115 snd_device_register(opl3->card, dev);
116 }
117 }
118
119 /* unregister */
120 void snd_opl3_free_seq_oss(struct snd_opl3 *opl3)
121 {
122 if (opl3->oss_seq_dev) {
123 /* The instance should have been released in prior */
124 opl3->oss_seq_dev = NULL;
125 }
126 }
127
128 /* ------------------------------ */
129
130 /* open OSS sequencer */
131 static int snd_opl3_open_seq_oss(struct snd_seq_oss_arg *arg, void *closure)
132 {
133 struct snd_opl3 *opl3 = closure;
134 int err;
135
136 if (snd_BUG_ON(!arg))
137 return -ENXIO;
138
139 err = snd_opl3_synth_setup(opl3);
140 if (err < 0)
141 return err;
142
143 /* fill the argument data */
144 arg->private_data = opl3;
145 arg->addr.client = opl3->oss_chset->client;
146 arg->addr.port = opl3->oss_chset->port;
147
148 err = snd_opl3_synth_use_inc(opl3);
149 if (err < 0)
150 return err;
151
152 opl3->synth_mode = SNDRV_OPL3_MODE_SYNTH;
153 return 0;
154 }
155
156 /* close OSS sequencer */
157 static int snd_opl3_close_seq_oss(struct snd_seq_oss_arg *arg)
158 {
159 struct snd_opl3 *opl3;
160
161 if (snd_BUG_ON(!arg))
162 return -ENXIO;
163 opl3 = arg->private_data;
164
165 snd_opl3_synth_cleanup(opl3);
166
167 snd_opl3_synth_use_dec(opl3);
168 return 0;
169 }
170
171 /* load patch */
172
173 /* from sound_config.h */
174 #define SBFM_MAXINSTR 256
175
176 static int snd_opl3_load_patch_seq_oss(struct snd_seq_oss_arg *arg, int format,
177 const char __user *buf, int offs, int count)
178 {
179 struct snd_opl3 *opl3;
180 struct sbi_instrument sbi;
181 char name[32];
182 int err, type;
183
184 if (snd_BUG_ON(!arg))
185 return -ENXIO;
186 opl3 = arg->private_data;
187
188 if (format == FM_PATCH)
189 type = FM_PATCH_OPL2;
190 else if (format == OPL3_PATCH)
191 type = FM_PATCH_OPL3;
192 else
193 return -EINVAL;
194
195 if (count < (int)sizeof(sbi)) {
196 snd_printk(KERN_ERR "FM Error: Patch record too short\n");
197 return -EINVAL;
198 }
199 if (copy_from_user(&sbi, buf, sizeof(sbi)))
200 return -EFAULT;
201
202 if (sbi.channel < 0 || sbi.channel >= SBFM_MAXINSTR) {
203 snd_printk(KERN_ERR "FM Error: Invalid instrument number %d\n",
204 sbi.channel);
205 return -EINVAL;
206 }
207
208 memset(name, 0, sizeof(name));
209 sprintf(name, "Chan%d", sbi.channel);
210
211 err = snd_opl3_load_patch(opl3, sbi.channel, 127, type, name, NULL,
212 sbi.operators);
213 if (err < 0)
214 return err;
215
216 return sizeof(sbi);
217 }
218
219 /* ioctl */
220 static int snd_opl3_ioctl_seq_oss(struct snd_seq_oss_arg *arg, unsigned int cmd,
221 unsigned long ioarg)
222 {
223 if (snd_BUG_ON(!arg))
224 return -ENXIO;
225 switch (cmd) {
226 case SNDCTL_FM_LOAD_INSTR:
227 snd_printk(KERN_ERR "OPL3: "
228 "Obsolete ioctl(SNDCTL_FM_LOAD_INSTR) used. "
229 "Fix the program.\n");
230 return -EINVAL;
231
232 case SNDCTL_SYNTH_MEMAVL:
233 return 0x7fffffff;
234
235 case SNDCTL_FM_4OP_ENABLE:
236 // handled automatically by OPL instrument type
237 return 0;
238
239 default:
240 return -EINVAL;
241 }
242 return 0;
243 }
244
245 /* reset device */
246 static int snd_opl3_reset_seq_oss(struct snd_seq_oss_arg *arg)
247 {
248 if (snd_BUG_ON(!arg))
249 return -ENXIO;
250
251 return 0;
252 }
253
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