sound/synth/emux/emux_seq.c

   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_DIRECT_SAMPLE)
  59
  60 /*
  61  * Initialise the EMUX Synth by creating a client and registering
  62  * a series of ports.
  63  * Each of the ports will contain the 16 midi channels.  Applications
  64  * can connect to these ports to play midi data.
  65  */
  66 int
  67 snd_emux_init_seq(struct snd_emux *emu, struct snd_card *card, int index)
  68 {
  69         int  i;
  70         struct snd_seq_port_callback pinfo;
  71         char tmpname[64];
  72
  73         emu->client = snd_seq_create_kernel_client(card, index,
  74                                                    "%s WaveTable", emu->name);
  75         if (emu->client < 0) {
  76                 snd_printk("can't create client\n");
  77                 return -ENODEV;
  78         }
  79
  80         if (emu->num_ports < 0) {
  81                 snd_printk("seqports must be greater than zero\n");
  82                 emu->num_ports = 1;
  83         } else if (emu->num_ports >= SNDRV_EMUX_MAX_PORTS) {
  84                 snd_printk("too many ports."
  85                            "limited max. ports %d\n", SNDRV_EMUX_MAX_PORTS);
  86                 emu->num_ports = SNDRV_EMUX_MAX_PORTS;
  87         }
  88
  89         memset(&pinfo, 0, sizeof(pinfo));
  90         pinfo.owner = THIS_MODULE;
  91         pinfo.use = snd_emux_use;
  92         pinfo.unuse = snd_emux_unuse;
  93         pinfo.event_input = snd_emux_event_input;
  94
  95         for (i = 0; i < emu->num_ports; i++) {
  96                 struct snd_emux_port *p;
  97
  98                 sprintf(tmpname, "%s Port %d", emu->name, i);
  99                 p = snd_emux_create_port(emu, tmpname, MIDI_CHANNELS,
 100                                          0, &pinfo);
 101                 if (p == NULL) {
 102                         snd_printk("can't create port\n");
 103                         return -ENOMEM;
 104                 }
 105
 106                 p->port_mode =  SNDRV_EMUX_PORT_MODE_MIDI;
 107                 snd_emux_init_port(p);
 108                 emu->ports[i] = p->chset.port;
 109                 emu->portptrs[i] = p;
 110         }
 111
 112         return 0;
 113 }
 114
 115
 116 /*
 117  * Detach from the ports that were set up for this synthesizer and
 118  * destroy the kernel client.
 119  */
 120 void
 121 snd_emux_detach_seq(struct snd_emux *emu)
 122 {
 123         if (emu->voices)
 124                 snd_emux_terminate_all(emu);
 125
 126         mutex_lock(&emu->register_mutex);
 127         if (emu->client >= 0) {
 128                 snd_seq_delete_kernel_client(emu->client);
 129                 emu->client = -1;
 130         }
 131         mutex_unlock(&emu->register_mutex);
 132 }
 133
 134
 135 /*
 136  * create a sequencer port and channel_set
 137  */
 138
 139 struct snd_emux_port *
 140 snd_emux_create_port(struct snd_emux *emu, char *name,
 141                      int max_channels, int oss_port,
 142                      struct snd_seq_port_callback *callback)
 143 {
 144         struct snd_emux_port *p;
 145         int i, type, cap;
 146
 147         /* Allocate structures for this channel */
 148         if ((p = kzalloc(sizeof(*p), GFP_KERNEL)) == NULL) {
 149                 snd_printk("no memory\n");
 150                 return NULL;
 151         }
 152         p->chset.channels = kcalloc(max_channels, sizeof(struct snd_midi_channel), GFP_KERNEL);
 153         if (p->chset.channels == NULL) {
 154                 snd_printk("no memory\n");
 155                 kfree(p);
 156                 return NULL;
 157         }
 158         for (i = 0; i < max_channels; i++)
 159                 p->chset.channels[i].number = i;
 160         p->chset.private_data = p;
 161         p->chset.max_channels = max_channels;
 162         p->emu = emu;
 163         p->chset.client = emu->client;
 164 #ifdef SNDRV_EMUX_USE_RAW_EFFECT
 165         snd_emux_create_effect(p);
 166 #endif
 167         callback->private_free = free_port;
 168         callback->private_data = p;
 169
 170         cap = SNDRV_SEQ_PORT_CAP_WRITE;
 171         if (oss_port) {
 172                 type = SNDRV_SEQ_PORT_TYPE_SPECIFIC;
 173         } else {
 174                 type = DEFAULT_MIDI_TYPE;
 175                 cap |= SNDRV_SEQ_PORT_CAP_SUBS_WRITE;
 176         }
 177
 178         p->chset.port = snd_seq_event_port_attach(emu->client, callback,
 179                                                   cap, type, max_channels,
 180                                                   emu->max_voices, name);
 181
 182         return p;
 183 }
 184
 185
 186 /*
 187  * release memory block for port
 188  */
 189 static void
 190 free_port(void *private_data)
 191 {
 192         struct snd_emux_port *p;
 193
 194         p = private_data;
 195         if (p) {
 196 #ifdef SNDRV_EMUX_USE_RAW_EFFECT
 197                 snd_emux_delete_effect(p);
 198 #endif
 199                 kfree(p->chset.channels);
 200                 kfree(p);
 201         }
 202 }
 203
 204
 205 #define DEFAULT_DRUM_FLAGS      (1<<9)
 206
 207 /*
 208  * initialize the port specific parameters
 209  */
 210 static void
 211 snd_emux_init_port(struct snd_emux_port *p)
 212 {
 213         p->drum_flags = DEFAULT_DRUM_FLAGS;
 214         p->volume_atten = 0;
 215
 216         snd_emux_reset_port(p);
 217 }
 218
 219
 220 /*
 221  * reset port
 222  */
 223 void
 224 snd_emux_reset_port(struct snd_emux_port *port)
 225 {
 226         int i;
 227
 228         /* stop all sounds */
 229         snd_emux_sounds_off_all(port);
 230
 231         snd_midi_channel_set_clear(&port->chset);
 232
 233 #ifdef SNDRV_EMUX_USE_RAW_EFFECT
 234         snd_emux_clear_effect(port);
 235 #endif
 236
 237         /* set port specific control parameters */
 238         port->ctrls[EMUX_MD_DEF_BANK] = 0;
 239         port->ctrls[EMUX_MD_DEF_DRUM] = 0;
 240         port->ctrls[EMUX_MD_REALTIME_PAN] = 1;
 241
 242         for (i = 0; i < port->chset.max_channels; i++) {
 243                 struct snd_midi_channel *chan = port->chset.channels + i;
 244                 chan->drum_channel = ((port->drum_flags >> i) & 1) ? 1 : 0;
 245         }
 246 }
 247
 248
 249 /*
 250  * input sequencer event
 251  */
 252 int
 253 snd_emux_event_input(struct snd_seq_event *ev, int direct, void *private_data,
 254                      int atomic, int hop)
 255 {
 256         struct snd_emux_port *port;
 257
 258         port = private_data;
 259         snd_assert(port != NULL && ev != NULL, 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 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
 286 /*
 287  * decrease usage count
 288  */
 289 void
 290 snd_emux_dec_count(struct snd_emux *emu)
 291 {
 292         module_put(emu->card->module);
 293         emu->used--;
 294         if (emu->used <= 0)
 295                 snd_emux_terminate_all(emu);
 296         module_put(emu->ops.owner);
 297 }
 298
 299
 300 /*
 301  * Routine that is called upon a first use of a particular port
 302  */
 303 static int
 304 snd_emux_use(void *private_data, struct snd_seq_port_subscribe *info)
 305 {
 306         struct snd_emux_port *p;
 307         struct snd_emux *emu;
 308
 309         p = private_data;
 310         snd_assert(p != NULL, return -EINVAL);
 311         emu = p->emu;
 312         snd_assert(emu != NULL, return -EINVAL);
 313
 314         mutex_lock(&emu->register_mutex);
 315         snd_emux_init_port(p);
 316         snd_emux_inc_count(emu);
 317         mutex_unlock(&emu->register_mutex);
 318         return 0;
 319 }
 320
 321 /*
 322  * Routine that is called upon the last unuse() of a particular port.
 323  */
 324 static int
 325 snd_emux_unuse(void *private_data, struct snd_seq_port_subscribe *info)
 326 {
 327         struct snd_emux_port *p;
 328         struct snd_emux *emu;
 329
 330         p = private_data;
 331         snd_assert(p != NULL, return -EINVAL);
 332         emu = p->emu;
 333         snd_assert(emu != NULL, return -EINVAL);
 334
 335         mutex_lock(&emu->register_mutex);
 336         snd_emux_sounds_off_all(p);
 337         snd_emux_dec_count(emu);
 338         mutex_unlock(&emu->register_mutex);
 339         return 0;
 340 }
 341
 342
 343 /*
 344  * attach virtual rawmidi devices
 345  */
 346 int snd_emux_init_virmidi(struct snd_emux *emu, struct snd_card *card)
 347 {
 348         int i;
 349
 350         emu->vmidi = NULL;
 351         if (emu->midi_ports <= 0)
 352                 return 0;
 353
 354         emu->vmidi = kcalloc(emu->midi_ports, sizeof(struct snd_rawmidi *), GFP_KERNEL);
 355         if (emu->vmidi == NULL)
 356                 return -ENOMEM;
 357
 358         for (i = 0; i < emu->midi_ports; i++) {
 359                 struct snd_rawmidi *rmidi;
 360                 struct snd_virmidi_dev *rdev;
 361                 if (snd_virmidi_new(card, emu->midi_devidx + i, &rmidi) < 0)
 362                         goto __error;
 363                 rdev = rmidi->private_data;
 364                 sprintf(rmidi->name, "%s Synth MIDI", emu->name);
 365                 rdev->seq_mode = SNDRV_VIRMIDI_SEQ_ATTACH;
 366                 rdev->client = emu->client;
 367                 rdev->port = emu->ports[i];
 368                 if (snd_device_register(card, rmidi) < 0) {
 369                         snd_device_free(card, rmidi);
 370                         goto __error;
 371                 }
 372                 emu->vmidi[i] = rmidi;
 373                 //snd_printk("virmidi %d ok\n", i);
 374         }
 375         return 0;
 376
 377 __error:
 378         //snd_printk("error init..\n");
 379         snd_emux_delete_virmidi(emu);
 380         return -ENOMEM;
 381 }
 382
 383 int snd_emux_delete_virmidi(struct snd_emux *emu)
 384 {
 385         int i;
 386
 387         if (emu->vmidi == NULL)
 388                 return 0;
 389
 390         for (i = 0; i < emu->midi_ports; i++) {
 391                 if (emu->vmidi[i])
 392                         snd_device_free(emu->card, emu->vmidi[i]);
 393         }
 394         kfree(emu->vmidi);
 395         emu->vmidi = NULL;
 396         return 0;
 397 }