opl3_oss.c revision 5e246b850df563224be26f1d409cf66fd6c968df 
1/*
2 *  Interface for OSS sequencer emulation
3 *
4 *  Copyright (C) 2000 Uros Bizjak <uros@kss-loka.si>
5 *
6 *   This program is free software; you can redistribute it and/or modify
7 *   it under the terms of the GNU General Public License as published by
8 *   the Free Software Foundation; either version 2 of the License, or
9 *   (at your option) any later version.
10 *
11 *   This program is distributed in the hope that it will be useful,
12 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
13 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 *   GNU General Public License for more details.
15 *
16 *   You should have received a copy of the GNU General Public License
17 *   along with this program; if not, write to the Free Software
18 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
19 */
20
21#include "opl3_voice.h"
22#include <linux/slab.h>
23
24static int snd_opl3_open_seq_oss(struct snd_seq_oss_arg *arg, void *closure);
25static int snd_opl3_close_seq_oss(struct snd_seq_oss_arg *arg);
26static int snd_opl3_ioctl_seq_oss(struct snd_seq_oss_arg *arg, unsigned int cmd, unsigned long ioarg);
27static int snd_opl3_load_patch_seq_oss(struct snd_seq_oss_arg *arg, int format, const char __user *buf, int offs, int count);
28static int snd_opl3_reset_seq_oss(struct snd_seq_oss_arg *arg);
29
30/* */
31
32static inline mm_segment_t snd_enter_user(void)
33{
34	mm_segment_t fs = get_fs();
35	set_fs(get_ds());
36	return fs;
37}
38
39static inline void snd_leave_user(mm_segment_t fs)
40{
41	set_fs(fs);
42}
43
44/* operators */
45
46extern struct snd_midi_op opl3_ops;
47
48static struct snd_seq_oss_callback oss_callback = {
49	.owner = 	THIS_MODULE,
50	.open =		snd_opl3_open_seq_oss,
51	.close =	snd_opl3_close_seq_oss,
52	.ioctl =	snd_opl3_ioctl_seq_oss,
53	.load_patch =	snd_opl3_load_patch_seq_oss,
54	.reset =	snd_opl3_reset_seq_oss,
55};
56
57static int snd_opl3_oss_event_input(struct snd_seq_event *ev, int direct,
58				    void *private_data, int atomic, int hop)
59{
60	struct snd_opl3 *opl3 = private_data;
61
62	if (ev->type != SNDRV_SEQ_EVENT_OSS)
63		snd_midi_process_event(&opl3_ops, ev, opl3->oss_chset);
64	return 0;
65}
66
67/* ------------------------------ */
68
69static void snd_opl3_oss_free_port(void *private_data)
70{
71	struct snd_opl3 *opl3 = private_data;
72
73	snd_midi_channel_free_set(opl3->oss_chset);
74}
75
76static int snd_opl3_oss_create_port(struct snd_opl3 * opl3)
77{
78	struct snd_seq_port_callback callbacks;
79	char name[32];
80	int voices, opl_ver;
81
82	voices = (opl3->hardware < OPL3_HW_OPL3) ?
83		MAX_OPL2_VOICES : MAX_OPL3_VOICES;
84	opl3->oss_chset = snd_midi_channel_alloc_set(voices);
85	if (opl3->oss_chset == NULL)
86		return -ENOMEM;
87	opl3->oss_chset->private_data = opl3;
88
89	memset(&callbacks, 0, sizeof(callbacks));
90	callbacks.owner = THIS_MODULE;
91	callbacks.event_input = snd_opl3_oss_event_input;
92	callbacks.private_free = snd_opl3_oss_free_port;
93	callbacks.private_data = opl3;
94
95	opl_ver = (opl3->hardware & OPL3_HW_MASK) >> 8;
96	sprintf(name, "OPL%i OSS Port", opl_ver);
97
98	opl3->oss_chset->client = opl3->seq_client;
99	opl3->oss_chset->port = snd_seq_event_port_attach(opl3->seq_client, &callbacks,
100							  SNDRV_SEQ_PORT_CAP_WRITE,
101							  SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC |
102							  SNDRV_SEQ_PORT_TYPE_MIDI_GM |
103							  SNDRV_SEQ_PORT_TYPE_HARDWARE |
104							  SNDRV_SEQ_PORT_TYPE_SYNTHESIZER,
105							  voices, voices,
106							  name);
107	if (opl3->oss_chset->port < 0) {
108		int port;
109		port = opl3->oss_chset->port;
110		snd_midi_channel_free_set(opl3->oss_chset);
111		return port;
112	}
113	return 0;
114}
115
116/* ------------------------------ */
117
118/* register OSS synth */
119void snd_opl3_init_seq_oss(struct snd_opl3 *opl3, char *name)
120{
121	struct snd_seq_oss_reg *arg;
122	struct snd_seq_device *dev;
123
124	if (snd_seq_device_new(opl3->card, 0, SNDRV_SEQ_DEV_ID_OSS,
125			       sizeof(struct snd_seq_oss_reg), &dev) < 0)
126		return;
127
128	opl3->oss_seq_dev = dev;
129	strlcpy(dev->name, name, sizeof(dev->name));
130	arg = SNDRV_SEQ_DEVICE_ARGPTR(dev);
131	arg->type = SYNTH_TYPE_FM;
132	if (opl3->hardware < OPL3_HW_OPL3) {
133		arg->subtype = FM_TYPE_ADLIB;
134		arg->nvoices = MAX_OPL2_VOICES;
135	} else {
136		arg->subtype = FM_TYPE_OPL3;
137		arg->nvoices = MAX_OPL3_VOICES;
138	}
139	arg->oper = oss_callback;
140	arg->private_data = opl3;
141
142	if (snd_opl3_oss_create_port(opl3)) {
143		/* register to OSS synth table */
144		snd_device_register(opl3->card, dev);
145	}
146}
147
148/* unregister */
149void snd_opl3_free_seq_oss(struct snd_opl3 *opl3)
150{
151	if (opl3->oss_seq_dev) {
152		/* The instance should have been released in prior */
153		opl3->oss_seq_dev = NULL;
154	}
155}
156
157/* ------------------------------ */
158
159/* open OSS sequencer */
160static int snd_opl3_open_seq_oss(struct snd_seq_oss_arg *arg, void *closure)
161{
162	struct snd_opl3 *opl3 = closure;
163	int err;
164
165	if (snd_BUG_ON(!arg))
166		return -ENXIO;
167
168	if ((err = snd_opl3_synth_setup(opl3)) < 0)
169		return err;
170
171	/* fill the argument data */
172	arg->private_data = opl3;
173	arg->addr.client = opl3->oss_chset->client;
174	arg->addr.port = opl3->oss_chset->port;
175
176	if ((err = snd_opl3_synth_use_inc(opl3)) < 0)
177		return err;
178
179	opl3->synth_mode = SNDRV_OPL3_MODE_SYNTH;
180	return 0;
181}
182
183/* close OSS sequencer */
184static int snd_opl3_close_seq_oss(struct snd_seq_oss_arg *arg)
185{
186	struct snd_opl3 *opl3;
187
188	if (snd_BUG_ON(!arg))
189		return -ENXIO;
190	opl3 = arg->private_data;
191
192	snd_opl3_synth_cleanup(opl3);
193
194	snd_opl3_synth_use_dec(opl3);
195	return 0;
196}
197
198/* load patch */
199
200/* from sound_config.h */
201#define SBFM_MAXINSTR	256
202
203static int snd_opl3_load_patch_seq_oss(struct snd_seq_oss_arg *arg, int format,
204				       const char __user *buf, int offs, int count)
205{
206	struct snd_opl3 *opl3;
207	struct sbi_instrument sbi;
208	char name[32];
209	int err, type;
210
211	if (snd_BUG_ON(!arg))
212		return -ENXIO;
213	opl3 = arg->private_data;
214
215	if (format == FM_PATCH)
216		type = FM_PATCH_OPL2;
217	else if (format == OPL3_PATCH)
218		type = FM_PATCH_OPL3;
219	else
220		return -EINVAL;
221
222	if (count < (int)sizeof(sbi)) {
223		snd_printk("FM Error: Patch record too short\n");
224		return -EINVAL;
225	}
226	if (copy_from_user(&sbi, buf, sizeof(sbi)))
227		return -EFAULT;
228
229	if (sbi.channel < 0 || sbi.channel >= SBFM_MAXINSTR) {
230		snd_printk("FM Error: Invalid instrument number %d\n",
231			   sbi.channel);
232		return -EINVAL;
233	}
234
235	memset(name, 0, sizeof(name));
236	sprintf(name, "Chan%d", sbi.channel);
237
238	err = snd_opl3_load_patch(opl3, sbi.channel, 127, type, name, NULL,
239				  sbi.operators);
240	if (err < 0)
241		return err;
242
243	return sizeof(sbi);
244}
245
246/* ioctl */
247static int snd_opl3_ioctl_seq_oss(struct snd_seq_oss_arg *arg, unsigned int cmd,
248				  unsigned long ioarg)
249{
250	struct snd_opl3 *opl3;
251
252	if (snd_BUG_ON(!arg))
253		return -ENXIO;
254	opl3 = arg->private_data;
255	switch (cmd) {
256		case SNDCTL_FM_LOAD_INSTR:
257			snd_printk("OPL3: Obsolete ioctl(SNDCTL_FM_LOAD_INSTR) used. Fix the program.\n");
258			return -EINVAL;
259
260		case SNDCTL_SYNTH_MEMAVL:
261			return 0x7fffffff;
262
263		case SNDCTL_FM_4OP_ENABLE:
264			// handled automatically by OPL instrument type
265			return 0;
266
267		default:
268			return -EINVAL;
269	}
270	return 0;
271}
272
273/* reset device */
274static int snd_opl3_reset_seq_oss(struct snd_seq_oss_arg *arg)
275{
276	struct snd_opl3 *opl3;
277
278	if (snd_BUG_ON(!arg))
279		return -ENXIO;
280	opl3 = arg->private_data;
281
282	return 0;
283}
284