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Linux/sound/synth/emux/emux_seq.c

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  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 #include <linux/module.h>
 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(KERN_ERR "can't create client\n");
 78                 return -ENODEV;
 79         }
 80 
 81         if (emu->num_ports < 0) {
 82                 snd_printk(KERN_WARNING "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(KERN_WARNING "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(KERN_ERR "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         if (emu->client >= 0) {
128                 snd_seq_delete_kernel_client(emu->client);
129                 emu->client = -1;
130         }
131 }
132 
133 
134 /*
135  * create a sequencer port and channel_set
136  */
137 
138 struct snd_emux_port *
139 snd_emux_create_port(struct snd_emux *emu, char *name,
140                      int max_channels, int oss_port,
141                      struct snd_seq_port_callback *callback)
142 {
143         struct snd_emux_port *p;
144         int i, type, cap;
145 
146         /* Allocate structures for this channel */
147         if ((p = kzalloc(sizeof(*p), GFP_KERNEL)) == NULL) {
148                 snd_printk(KERN_ERR "no memory\n");
149                 return NULL;
150         }
151         p->chset.channels = kcalloc(max_channels, sizeof(struct snd_midi_channel), GFP_KERNEL);
152         if (p->chset.channels == NULL) {
153                 snd_printk(KERN_ERR "no memory\n");
154                 kfree(p);
155                 return NULL;
156         }
157         for (i = 0; i < max_channels; i++)
158                 p->chset.channels[i].number = i;
159         p->chset.private_data = p;
160         p->chset.max_channels = max_channels;
161         p->emu = emu;
162         p->chset.client = emu->client;
163 #ifdef SNDRV_EMUX_USE_RAW_EFFECT
164         snd_emux_create_effect(p);
165 #endif
166         callback->private_free = free_port;
167         callback->private_data = p;
168 
169         cap = SNDRV_SEQ_PORT_CAP_WRITE;
170         if (oss_port) {
171                 type = SNDRV_SEQ_PORT_TYPE_SPECIFIC;
172         } else {
173                 type = DEFAULT_MIDI_TYPE;
174                 cap |= SNDRV_SEQ_PORT_CAP_SUBS_WRITE;
175         }
176 
177         p->chset.port = snd_seq_event_port_attach(emu->client, callback,
178                                                   cap, type, max_channels,
179                                                   emu->max_voices, name);
180 
181         return p;
182 }
183 
184 
185 /*
186  * release memory block for port
187  */
188 static void
189 free_port(void *private_data)
190 {
191         struct snd_emux_port *p;
192 
193         p = private_data;
194         if (p) {
195 #ifdef SNDRV_EMUX_USE_RAW_EFFECT
196                 snd_emux_delete_effect(p);
197 #endif
198                 kfree(p->chset.channels);
199                 kfree(p);
200         }
201 }
202 
203 
204 #define DEFAULT_DRUM_FLAGS      (1<<9)
205 
206 /*
207  * initialize the port specific parameters
208  */
209 static void
210 snd_emux_init_port(struct snd_emux_port *p)
211 {
212         p->drum_flags = DEFAULT_DRUM_FLAGS;
213         p->volume_atten = 0;
214 
215         snd_emux_reset_port(p);
216 }
217 
218 
219 /*
220  * reset port
221  */
222 void
223 snd_emux_reset_port(struct snd_emux_port *port)
224 {
225         int i;
226 
227         /* stop all sounds */
228         snd_emux_sounds_off_all(port);
229 
230         snd_midi_channel_set_clear(&port->chset);
231 
232 #ifdef SNDRV_EMUX_USE_RAW_EFFECT
233         snd_emux_clear_effect(port);
234 #endif
235 
236         /* set port specific control parameters */
237         port->ctrls[EMUX_MD_DEF_BANK] = 0;
238         port->ctrls[EMUX_MD_DEF_DRUM] = 0;
239         port->ctrls[EMUX_MD_REALTIME_PAN] = 1;
240 
241         for (i = 0; i < port->chset.max_channels; i++) {
242                 struct snd_midi_channel *chan = port->chset.channels + i;
243                 chan->drum_channel = ((port->drum_flags >> i) & 1) ? 1 : 0;
244         }
245 }
246 
247 
248 /*
249  * input sequencer event
250  */
251 int
252 snd_emux_event_input(struct snd_seq_event *ev, int direct, void *private_data,
253                      int atomic, int hop)
254 {
255         struct snd_emux_port *port;
256 
257         port = private_data;
258         if (snd_BUG_ON(!port || !ev))
259                 return -EINVAL;
260 
261         snd_midi_process_event(&emux_ops, ev, &port->chset);
262 
263         return 0;
264 }
265 
266 
267 /*
268  * increment usage count
269  */
270 static int
271 __snd_emux_inc_count(struct snd_emux *emu)
272 {
273         emu->used++;
274         if (!try_module_get(emu->ops.owner))
275                 goto __error;
276         if (!try_module_get(emu->card->module)) {
277                 module_put(emu->ops.owner);
278               __error:
279                 emu->used--;
280                 return 0;
281         }
282         return 1;
283 }
284 
285 int snd_emux_inc_count(struct snd_emux *emu)
286 {
287         int ret;
288 
289         mutex_lock(&emu->register_mutex);
290         ret = __snd_emux_inc_count(emu);
291         mutex_unlock(&emu->register_mutex);
292         return ret;
293 }
294 
295 /*
296  * decrease usage count
297  */
298 static void
299 __snd_emux_dec_count(struct snd_emux *emu)
300 {
301         module_put(emu->card->module);
302         emu->used--;
303         if (emu->used <= 0)
304                 snd_emux_terminate_all(emu);
305         module_put(emu->ops.owner);
306 }
307 
308 void snd_emux_dec_count(struct snd_emux *emu)
309 {
310         mutex_lock(&emu->register_mutex);
311         __snd_emux_dec_count(emu);
312         mutex_unlock(&emu->register_mutex);
313 }
314 
315 /*
316  * Routine that is called upon a first use of a particular port
317  */
318 static int
319 snd_emux_use(void *private_data, struct snd_seq_port_subscribe *info)
320 {
321         struct snd_emux_port *p;
322         struct snd_emux *emu;
323 
324         p = private_data;
325         if (snd_BUG_ON(!p))
326                 return -EINVAL;
327         emu = p->emu;
328         if (snd_BUG_ON(!emu))
329                 return -EINVAL;
330 
331         mutex_lock(&emu->register_mutex);
332         snd_emux_init_port(p);
333         __snd_emux_inc_count(emu);
334         mutex_unlock(&emu->register_mutex);
335         return 0;
336 }
337 
338 /*
339  * Routine that is called upon the last unuse() of a particular port.
340  */
341 static int
342 snd_emux_unuse(void *private_data, struct snd_seq_port_subscribe *info)
343 {
344         struct snd_emux_port *p;
345         struct snd_emux *emu;
346 
347         p = private_data;
348         if (snd_BUG_ON(!p))
349                 return -EINVAL;
350         emu = p->emu;
351         if (snd_BUG_ON(!emu))
352                 return -EINVAL;
353 
354         mutex_lock(&emu->register_mutex);
355         snd_emux_sounds_off_all(p);
356         __snd_emux_dec_count(emu);
357         mutex_unlock(&emu->register_mutex);
358         return 0;
359 }
360 
361 
362 /*
363  * attach virtual rawmidi devices
364  */
365 int snd_emux_init_virmidi(struct snd_emux *emu, struct snd_card *card)
366 {
367         int i;
368 
369         emu->vmidi = NULL;
370         if (emu->midi_ports <= 0)
371                 return 0;
372 
373         emu->vmidi = kcalloc(emu->midi_ports, sizeof(struct snd_rawmidi *), GFP_KERNEL);
374         if (emu->vmidi == NULL)
375                 return -ENOMEM;
376 
377         for (i = 0; i < emu->midi_ports; i++) {
378                 struct snd_rawmidi *rmidi;
379                 struct snd_virmidi_dev *rdev;
380                 if (snd_virmidi_new(card, emu->midi_devidx + i, &rmidi) < 0)
381                         goto __error;
382                 rdev = rmidi->private_data;
383                 sprintf(rmidi->name, "%s Synth MIDI", emu->name);
384                 rdev->seq_mode = SNDRV_VIRMIDI_SEQ_ATTACH;
385                 rdev->client = emu->client;
386                 rdev->port = emu->ports[i];
387                 if (snd_device_register(card, rmidi) < 0) {
388                         snd_device_free(card, rmidi);
389                         goto __error;
390                 }
391                 emu->vmidi[i] = rmidi;
392                 /* snd_printk(KERN_DEBUG "virmidi %d ok\n", i); */
393         }
394         return 0;
395 
396 __error:
397         /* snd_printk(KERN_DEBUG "error init..\n"); */
398         snd_emux_delete_virmidi(emu);
399         return -ENOMEM;
400 }
401 
402 int snd_emux_delete_virmidi(struct snd_emux *emu)
403 {
404         int i;
405 
406         if (emu->vmidi == NULL)
407                 return 0;
408 
409         for (i = 0; i < emu->midi_ports; i++) {
410                 if (emu->vmidi[i])
411                         snd_device_free(emu->card, emu->vmidi[i]);
412         }
413         kfree(emu->vmidi);
414         emu->vmidi = NULL;
415         return 0;
416 }
417 

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