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 
snd_opl3_oss_event_input(struct snd_seq_event * ev,int direct,void * private_data,int atomic,int hop)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 
snd_opl3_oss_free_port(void * private_data)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 
snd_opl3_oss_create_port(struct snd_opl3 * opl3)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 */
snd_opl3_init_seq_oss(struct snd_opl3 * opl3,char * name)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 */
snd_opl3_free_seq_oss(struct snd_opl3 * opl3)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 */
snd_opl3_open_seq_oss(struct snd_seq_oss_arg * arg,void * closure)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 */
snd_opl3_close_seq_oss(struct snd_seq_oss_arg * arg)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 
snd_opl3_load_patch_seq_oss(struct snd_seq_oss_arg * arg,int format,const char __user * buf,int offs,int count)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 */
snd_opl3_ioctl_seq_oss(struct snd_seq_oss_arg * arg,unsigned int cmd,unsigned long ioarg)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 */
snd_opl3_reset_seq_oss(struct snd_seq_oss_arg * arg)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