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(snd_emux_port_t *p);
  29 static int snd_emux_use(void *private_data, snd_seq_port_subscribe_t *info);
  30 static int snd_emux_unuse(void *private_data, snd_seq_port_subscribe_t *info);
  31 static int get_client(snd_card_t *card, int index, char *name);
  32
  33 /*
  34  * MIDI emulation operators
  35  */
  36 static snd_midi_op_t emux_ops = {
  37         snd_emux_note_on,
  38         snd_emux_note_off,
  39         snd_emux_key_press,
  40         snd_emux_terminate_note,
  41         snd_emux_control,
  42         snd_emux_nrpn,
  43         snd_emux_sysex,
  44 };
  45
  46
  47 /*
  48  * number of MIDI channels
  49  */
  50 #define MIDI_CHANNELS           16
  51
  52 /*
  53  * type flags for MIDI sequencer port
  54  */
  55 #define DEFAULT_MIDI_TYPE       (SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC |\
  56                                  SNDRV_SEQ_PORT_TYPE_MIDI_GM |\
  57                                  SNDRV_SEQ_PORT_TYPE_MIDI_GS |\
  58                                  SNDRV_SEQ_PORT_TYPE_MIDI_XG |\
  59                                  SNDRV_SEQ_PORT_TYPE_DIRECT_SAMPLE)
  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(snd_emux_t *emu, snd_card_t *card, int index)
  69 {
  70         int  i;
  71         snd_seq_port_callback_t pinfo;
  72         char tmpname[64];
  73
  74         sprintf(tmpname, "%s WaveTable", emu->name);
  75         emu->client = get_client(card, index, tmpname);
  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                 snd_emux_port_t *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(snd_emux_t *emu)
 123 {
 124         if (emu->voices)
 125                 snd_emux_terminate_all(emu);
 126
 127         down(&emu->register_mutex);
 128         if (emu->client >= 0) {
 129                 snd_seq_delete_kernel_client(emu->client);
 130                 emu->client = -1;
 131         }
 132         up(&emu->register_mutex);
 133 }
 134
 135
 136 /*
 137  * create a sequencer port and channel_set
 138  */
 139
 140 snd_emux_port_t *
 141 snd_emux_create_port(snd_emux_t *emu, char *name,
 142                         int max_channels, int oss_port,
 143                         snd_seq_port_callback_t *callback)
 144 {
 145         snd_emux_port_t *p;
 146         int i, type, cap;
 147
 148         /* Allocate structures for this channel */
 149         if ((p = kcalloc(1, sizeof(*p), GFP_KERNEL)) == NULL) {
 150                 snd_printk("no memory\n");
 151                 return NULL;
 152         }
 153         p->chset.channels = kcalloc(max_channels, sizeof(snd_midi_channel_t), 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         snd_emux_port_t *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(snd_emux_port_t *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(snd_emux_port_t *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                 snd_midi_channel_t *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(snd_seq_event_t *ev, int direct, void *private_data,
 255                      int atomic, int hop)
 256 {
 257         snd_emux_port_t *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(snd_emux_t *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(snd_emux_t *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, snd_seq_port_subscribe_t *info)
 306 {
 307         snd_emux_port_t *p;
 308         snd_emux_t *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         down(&emu->register_mutex);
 316         snd_emux_init_port(p);
 317         snd_emux_inc_count(emu);
 318         up(&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, snd_seq_port_subscribe_t *info)
 327 {
 328         snd_emux_port_t *p;
 329         snd_emux_t *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         down(&emu->register_mutex);
 337         snd_emux_sounds_off_all(p);
 338         snd_emux_dec_count(emu);
 339         up(&emu->register_mutex);
 340         return 0;
 341 }
 342
 343
 344 /*
 345  * Create a sequencer client
 346  */
 347 static int
 348 get_client(snd_card_t *card, int index, char *name)
 349 {
 350         snd_seq_client_callback_t callbacks;
 351         snd_seq_client_info_t cinfo;
 352         int client;
 353
 354         memset(&callbacks, 0, sizeof(callbacks));
 355         callbacks.private_data = NULL;
 356         callbacks.allow_input = 1;
 357         callbacks.allow_output = 1;
 358
 359         /* Find a free client, start from 1 as the MPU expects to use 0 */
 360         client = snd_seq_create_kernel_client(card, index, &callbacks);
 361         if (client < 0)
 362                 return client;
 363
 364         memset(&cinfo, 0, sizeof(cinfo));
 365         cinfo.client = client;
 366         cinfo.type = KERNEL_CLIENT;
 367         strcpy(cinfo.name, name);
 368         snd_seq_kernel_client_ctl(client, SNDRV_SEQ_IOCTL_SET_CLIENT_INFO, &cinfo);
 369
 370         return client;
 371 }
 372
 373
 374 /*
 375  * attach virtual rawmidi devices
 376  */
 377 int snd_emux_init_virmidi(snd_emux_t *emu, snd_card_t *card)
 378 {
 379         int i;
 380
 381         emu->vmidi = NULL;
 382         if (emu->midi_ports <= 0)
 383                 return 0;
 384
 385         emu->vmidi = kcalloc(emu->midi_ports, sizeof(snd_rawmidi_t*), GFP_KERNEL);
 386         if (emu->vmidi == NULL)
 387                 return -ENOMEM;
 388
 389         for (i = 0; i < emu->midi_ports; i++) {
 390                 snd_rawmidi_t *rmidi;
 391                 snd_virmidi_dev_t *rdev;
 392                 if (snd_virmidi_new(card, emu->midi_devidx + i, &rmidi) < 0)
 393                         goto __error;
 394                 rdev = rmidi->private_data;
 395                 sprintf(rmidi->name, "%s Synth MIDI", emu->name);
 396                 rdev->seq_mode = SNDRV_VIRMIDI_SEQ_ATTACH;
 397                 rdev->client = emu->client;
 398                 rdev->port = emu->ports[i];
 399                 if (snd_device_register(card, rmidi) < 0) {
 400                         snd_device_free(card, rmidi);
 401                         goto __error;
 402                 }
 403                 emu->vmidi[i] = rmidi;
 404                 //snd_printk("virmidi %d ok\n", i);
 405         }
 406         return 0;
 407
 408 __error:
 409         //snd_printk("error init..\n");
 410         snd_emux_delete_virmidi(emu);
 411         return -ENOMEM;
 412 }
 413
 414 int snd_emux_delete_virmidi(snd_emux_t *emu)
 415 {
 416         int i;
 417
 418         if (emu->vmidi == NULL)
 419                 return 0;
 420
 421         for (i = 0; i < emu->midi_ports; i++) {
 422                 if (emu->vmidi[i])
 423                         snd_device_free(emu->card, emu->vmidi[i]);
 424         }
 425         kfree(emu->vmidi);
 426         emu->vmidi = NULL;
 427         return 0;
 428 }