1 /*
2 * Midi Sequencer interface routines.
3 *
4 * Copyright (C) 1999 Steve Ratcliffe
5 * Copyright (c) 1999-2000 Takashi Iwai <tiwai@suse.de>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22 #include "emux_voice.h"
23 #include <linux/slab.h>
24
25
26 /* Prototypes for static functions */
27 static void free_port(void *private);
28 static void snd_emux_init_port(struct snd_emux_port *p);
29 static int snd_emux_use(void *private_data, struct snd_seq_port_subscribe *info);
30 static int snd_emux_unuse(void *private_data, struct snd_seq_port_subscribe *info);
31
32 /*
33 * MIDI emulation operators
34 */
35 static struct snd_midi_op emux_ops = {
36 snd_emux_note_on,
37 snd_emux_note_off,
38 snd_emux_key_press,
39 snd_emux_terminate_note,
40 snd_emux_control,
41 snd_emux_nrpn,
42 snd_emux_sysex,
43 };
44
45
46 /*
47 * number of MIDI channels
48 */
49 #define MIDI_CHANNELS 16
50
51 /*
52 * type flags for MIDI sequencer port
53 */
54 #define DEFAULT_MIDI_TYPE (SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC |\
55 SNDRV_SEQ_PORT_TYPE_MIDI_GM |\
56 SNDRV_SEQ_PORT_TYPE_MIDI_GS |\
57 SNDRV_SEQ_PORT_TYPE_MIDI_XG |\
58 SNDRV_SEQ_PORT_TYPE_HARDWARE |\
59 SNDRV_SEQ_PORT_TYPE_SYNTHESIZER)
60
61 /*
62 * Initialise the EMUX Synth by creating a client and registering
63 * a series of ports.
64 * Each of the ports will contain the 16 midi channels. Applications
65 * can connect to these ports to play midi data.
66 */
67 int
68 snd_emux_init_seq(struct snd_emux *emu, struct snd_card *card, int index)
69 {
70 int i;
71 struct snd_seq_port_callback pinfo;
72 char tmpname[64];
73
74 emu->client = snd_seq_create_kernel_client(card, index,
75 "%s WaveTable", emu->name);
76 if (emu->client < 0) {
77 snd_printk("can't create client\n");
78 return -ENODEV;
79 }
80
81 if (emu->num_ports < 0) {
82 snd_printk("seqports must be greater than zero\n");
83 emu->num_ports = 1;
84 } else if (emu->num_ports >= SNDRV_EMUX_MAX_PORTS) {
85 snd_printk("too many ports."
86 "limited max. ports %d\n", SNDRV_EMUX_MAX_PORTS);
87 emu->num_ports = SNDRV_EMUX_MAX_PORTS;
88 }
89
90 memset(&pinfo, 0, sizeof(pinfo));
91 pinfo.owner = THIS_MODULE;
92 pinfo.use = snd_emux_use;
93 pinfo.unuse = snd_emux_unuse;
94 pinfo.event_input = snd_emux_event_input;
95
96 for (i = 0; i < emu->num_ports; i++) {
97 struct snd_emux_port *p;
98
99 sprintf(tmpname, "%s Port %d", emu->name, i);
100 p = snd_emux_create_port(emu, tmpname, MIDI_CHANNELS,
101 0, &pinfo);
102 if (p == NULL) {
103 snd_printk("can't create port\n");
104 return -ENOMEM;
105 }
106
107 p->port_mode = SNDRV_EMUX_PORT_MODE_MIDI;
108 snd_emux_init_port(p);
109 emu->ports[i] = p->chset.port;
110 emu->portptrs[i] = p;
111 }
112
113 return 0;
114 }
115
116
117 /*
118 * Detach from the ports that were set up for this synthesizer and
119 * destroy the kernel client.
120 */
121 void
122 snd_emux_detach_seq(struct snd_emux *emu)
123 {
124 if (emu->voices)
125 snd_emux_terminate_all(emu);
126
127 mutex_lock(&emu->register_mutex);
128 if (emu->client >= 0) {
129 snd_seq_delete_kernel_client(emu->client);
130 emu->client = -1;
131 }
132 mutex_unlock(&emu->register_mutex);
133 }
134
135
136 /*
137 * create a sequencer port and channel_set
138 */
139
140 struct snd_emux_port *
141 snd_emux_create_port(struct snd_emux *emu, char *name,
142 int max_channels, int oss_port,
143 struct snd_seq_port_callback *callback)
144 {
145 struct snd_emux_port *p;
146 int i, type, cap;
147
148 /* Allocate structures for this channel */
149 if ((p = kzalloc(sizeof(*p), GFP_KERNEL)) == NULL) {
150 snd_printk("no memory\n");
151 return NULL;
152 }
153 p->chset.channels = kcalloc(max_channels, sizeof(struct snd_midi_channel), GFP_KERNEL);
154 if (p->chset.channels == NULL) {
155 snd_printk("no memory\n");
156 kfree(p);
157 return NULL;
158 }
159 for (i = 0; i < max_channels; i++)
160 p->chset.channels[i].number = i;
161 p->chset.private_data = p;
162 p->chset.max_channels = max_channels;
163 p->emu = emu;
164 p->chset.client = emu->client;
165 #ifdef SNDRV_EMUX_USE_RAW_EFFECT
166 snd_emux_create_effect(p);
167 #endif
168 callback->private_free = free_port;
169 callback->private_data = p;
170
171 cap = SNDRV_SEQ_PORT_CAP_WRITE;
172 if (oss_port) {
173 type = SNDRV_SEQ_PORT_TYPE_SPECIFIC;
174 } else {
175 type = DEFAULT_MIDI_TYPE;
176 cap |= SNDRV_SEQ_PORT_CAP_SUBS_WRITE;
177 }
178
179 p->chset.port = snd_seq_event_port_attach(emu->client, callback,
180 cap, type, max_channels,
181 emu->max_voices, name);
182
183 return p;
184 }
185
186
187 /*
188 * release memory block for port
189 */
190 static void
191 free_port(void *private_data)
192 {
193 struct snd_emux_port *p;
194
195 p = private_data;
196 if (p) {
197 #ifdef SNDRV_EMUX_USE_RAW_EFFECT
198 snd_emux_delete_effect(p);
199 #endif
200 kfree(p->chset.channels);
201 kfree(p);
202 }
203 }
204
205
206 #define DEFAULT_DRUM_FLAGS (1<<9)
207
208 /*
209 * initialize the port specific parameters
210 */
211 static void
212 snd_emux_init_port(struct snd_emux_port *p)
213 {
214 p->drum_flags = DEFAULT_DRUM_FLAGS;
215 p->volume_atten = 0;
216
217 snd_emux_reset_port(p);
218 }
219
220
221 /*
222 * reset port
223 */
224 void
225 snd_emux_reset_port(struct snd_emux_port *port)
226 {
227 int i;
228
229 /* stop all sounds */
230 snd_emux_sounds_off_all(port);
231
232 snd_midi_channel_set_clear(&port->chset);
233
234 #ifdef SNDRV_EMUX_USE_RAW_EFFECT
235 snd_emux_clear_effect(port);
236 #endif
237
238 /* set port specific control parameters */
239 port->ctrls[EMUX_MD_DEF_BANK] = 0;
240 port->ctrls[EMUX_MD_DEF_DRUM] = 0;
241 port->ctrls[EMUX_MD_REALTIME_PAN] = 1;
242
243 for (i = 0; i < port->chset.max_channels; i++) {
244 struct snd_midi_channel *chan = port->chset.channels + i;
245 chan->drum_channel = ((port->drum_flags >> i) & 1) ? 1 : 0;
246 }
247 }
248
249
250 /*
251 * input sequencer event
252 */
253 int
254 snd_emux_event_input(struct snd_seq_event *ev, int direct, void *private_data,
255 int atomic, int hop)
256 {
257 struct snd_emux_port *port;
258
259 port = private_data;
260 snd_assert(port != NULL && ev != NULL, return -EINVAL);
261
262 snd_midi_process_event(&emux_ops, ev, &port->chset);
263
264 return 0;
265 }
266
267
268 /*
269 * increment usage count
270 */
271 int
272 snd_emux_inc_count(struct snd_emux *emu)
273 {
274 emu->used++;
275 if (!try_module_get(emu->ops.owner))
276 goto __error;
277 if (!try_module_get(emu->card->module)) {
278 module_put(emu->ops.owner);
279 __error:
280 emu->used--;
281 return 0;
282 }
283 return 1;
284 }
285
286
287 /*
288 * decrease usage count
289 */
290 void
291 snd_emux_dec_count(struct snd_emux *emu)
292 {
293 module_put(emu->card->module);
294 emu->used--;
295 if (emu->used <= 0)
296 snd_emux_terminate_all(emu);
297 module_put(emu->ops.owner);
298 }
299
300
301 /*
302 * Routine that is called upon a first use of a particular port
303 */
304 static int
305 snd_emux_use(void *private_data, struct snd_seq_port_subscribe *info)
306 {
307 struct snd_emux_port *p;
308 struct snd_emux *emu;
309
310 p = private_data;
311 snd_assert(p != NULL, return -EINVAL);
312 emu = p->emu;
313 snd_assert(emu != NULL, return -EINVAL);
314
315 mutex_lock(&emu->register_mutex);
316 snd_emux_init_port(p);
317 snd_emux_inc_count(emu);
318 mutex_unlock(&emu->register_mutex);
319 return 0;
320 }
321
322 /*
323 * Routine that is called upon the last unuse() of a particular port.
324 */
325 static int
326 snd_emux_unuse(void *private_data, struct snd_seq_port_subscribe *info)
327 {
328 struct snd_emux_port *p;
329 struct snd_emux *emu;
330
331 p = private_data;
332 snd_assert(p != NULL, return -EINVAL);
333 emu = p->emu;
334 snd_assert(emu != NULL, return -EINVAL);
335
336 mutex_lock(&emu->register_mutex);
337 snd_emux_sounds_off_all(p);
338 snd_emux_dec_count(emu);
339 mutex_unlock(&emu->register_mutex);
340 return 0;
341 }
342
343
344 /*
345 * attach virtual rawmidi devices
346 */
347 int snd_emux_init_virmidi(struct snd_emux *emu, struct snd_card *card)
348 {
349 int i;
350
351 emu->vmidi = NULL;
352 if (emu->midi_ports <= 0)
353 return 0;
354
355 emu->vmidi = kcalloc(emu->midi_ports, sizeof(struct snd_rawmidi *), GFP_KERNEL);
356 if (emu->vmidi == NULL)
357 return -ENOMEM;
358
359 for (i = 0; i < emu->midi_ports; i++) {
360 struct snd_rawmidi *rmidi;
361 struct snd_virmidi_dev *rdev;
362 if (snd_virmidi_new(card, emu->midi_devidx + i, &rmidi) < 0)
363 goto __error;
364 rdev = rmidi->private_data;
365 sprintf(rmidi->name, "%s Synth MIDI", emu->name);
366 rdev->seq_mode = SNDRV_VIRMIDI_SEQ_ATTACH;
367 rdev->client = emu->client;
368 rdev->port = emu->ports[i];
369 if (snd_device_register(card, rmidi) < 0) {
370 snd_device_free(card, rmidi);
371 goto __error;
372 }
373 emu->vmidi[i] = rmidi;
374 //snd_printk("virmidi %d ok\n", i);
375 }
376 return 0;
377
378 __error:
379 //snd_printk("error init..\n");
380 snd_emux_delete_virmidi(emu);
381 return -ENOMEM;
382 }
383
384 int snd_emux_delete_virmidi(struct snd_emux *emu)
385 {
386 int i;
387
388 if (emu->vmidi == NULL)
389 return 0;
390
391 for (i = 0; i < emu->midi_ports; i++) {
392 if (emu->vmidi[i])
393 snd_device_free(emu->card, emu->vmidi[i]);
394 }
395 kfree(emu->vmidi);
396 emu->vmidi = NULL;
397 return 0;
398 }
399
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