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 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(KERN_ERR "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(KERN_ERR "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 if (snd_BUG_ON(!port || !ev)) 261 return -EINVAL; 262 263 snd_midi_process_event(&emux_ops, ev, &port->chset); 264 265 return 0; 266 } 267 268 269 /* 270 * increment usage count 271 */ 272 int 273 snd_emux_inc_count(struct snd_emux *emu) 274 { 275 emu->used++; 276 if (!try_module_get(emu->ops.owner)) 277 goto __error; 278 if (!try_module_get(emu->card->module)) { 279 module_put(emu->ops.owner); 280 __error: 281 emu->used--; 282 return 0; 283 } 284 return 1; 285 } 286 287 288 /* 289 * decrease usage count 290 */ 291 void 292 snd_emux_dec_count(struct snd_emux *emu) 293 { 294 module_put(emu->card->module); 295 emu->used--; 296 if (emu->used <= 0) 297 snd_emux_terminate_all(emu); 298 module_put(emu->ops.owner); 299 } 300 301 302 /* 303 * Routine that is called upon a first use of a particular port 304 */ 305 static int 306 snd_emux_use(void *private_data, struct snd_seq_port_subscribe *info) 307 { 308 struct snd_emux_port *p; 309 struct snd_emux *emu; 310 311 p = private_data; 312 if (snd_BUG_ON(!p)) 313 return -EINVAL; 314 emu = p->emu; 315 if (snd_BUG_ON(!emu)) 316 return -EINVAL; 317 318 mutex_lock(&emu->register_mutex); 319 snd_emux_init_port(p); 320 snd_emux_inc_count(emu); 321 mutex_unlock(&emu->register_mutex); 322 return 0; 323 } 324 325 /* 326 * Routine that is called upon the last unuse() of a particular port. 327 */ 328 static int 329 snd_emux_unuse(void *private_data, struct snd_seq_port_subscribe *info) 330 { 331 struct snd_emux_port *p; 332 struct snd_emux *emu; 333 334 p = private_data; 335 if (snd_BUG_ON(!p)) 336 return -EINVAL; 337 emu = p->emu; 338 if (snd_BUG_ON(!emu)) 339 return -EINVAL; 340 341 mutex_lock(&emu->register_mutex); 342 snd_emux_sounds_off_all(p); 343 snd_emux_dec_count(emu); 344 mutex_unlock(&emu->register_mutex); 345 return 0; 346 } 347 348 349 /* 350 * attach virtual rawmidi devices 351 */ 352 int snd_emux_init_virmidi(struct snd_emux *emu, struct snd_card *card) 353 { 354 int i; 355 356 emu->vmidi = NULL; 357 if (emu->midi_ports <= 0) 358 return 0; 359 360 emu->vmidi = kcalloc(emu->midi_ports, sizeof(struct snd_rawmidi *), GFP_KERNEL); 361 if (emu->vmidi == NULL) 362 return -ENOMEM; 363 364 for (i = 0; i < emu->midi_ports; i++) { 365 struct snd_rawmidi *rmidi; 366 struct snd_virmidi_dev *rdev; 367 if (snd_virmidi_new(card, emu->midi_devidx + i, &rmidi) < 0) 368 goto __error; 369 rdev = rmidi->private_data; 370 sprintf(rmidi->name, "%s Synth MIDI", emu->name); 371 rdev->seq_mode = SNDRV_VIRMIDI_SEQ_ATTACH; 372 rdev->client = emu->client; 373 rdev->port = emu->ports[i]; 374 if (snd_device_register(card, rmidi) < 0) { 375 snd_device_free(card, rmidi); 376 goto __error; 377 } 378 emu->vmidi[i] = rmidi; 379 /* snd_printk(KERN_DEBUG "virmidi %d ok\n", i); */ 380 } 381 return 0; 382 383 __error: 384 /* snd_printk(KERN_DEBUG "error init..\n"); */ 385 snd_emux_delete_virmidi(emu); 386 return -ENOMEM; 387 } 388 389 int snd_emux_delete_virmidi(struct snd_emux *emu) 390 { 391 int i; 392 393 if (emu->vmidi == NULL) 394 return 0; 395 396 for (i = 0; i < emu->midi_ports; i++) { 397 if (emu->vmidi[i]) 398 snd_device_free(emu->card, emu->vmidi[i]); 399 } 400 kfree(emu->vmidi); 401 emu->vmidi = NULL; 402 return 0; 403 } 404