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 #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 }