1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * OSS compatible sequencer driver 4 * 5 * Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de> 6 */ 7 8#include "seq_oss_device.h" 9#include "seq_oss_synth.h" 10#include "seq_oss_midi.h" 11#include "seq_oss_event.h" 12#include "seq_oss_timer.h" 13#include <sound/seq_oss_legacy.h> 14#include "seq_oss_readq.h" 15#include "seq_oss_writeq.h" 16#include <linux/nospec.h> 17 18 19/* 20 * prototypes 21 */ 22static int extended_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev); 23static int chn_voice_event(struct seq_oss_devinfo *dp, union evrec *event_rec, struct snd_seq_event *ev); 24static int chn_common_event(struct seq_oss_devinfo *dp, union evrec *event_rec, struct snd_seq_event *ev); 25static int timing_event(struct seq_oss_devinfo *dp, union evrec *event_rec, struct snd_seq_event *ev); 26static int local_event(struct seq_oss_devinfo *dp, union evrec *event_rec, struct snd_seq_event *ev); 27static int old_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev); 28static int note_on_event(struct seq_oss_devinfo *dp, int dev, int ch, int note, int vel, struct snd_seq_event *ev); 29static int note_off_event(struct seq_oss_devinfo *dp, int dev, int ch, int note, int vel, struct snd_seq_event *ev); 30static int set_note_event(struct seq_oss_devinfo *dp, int dev, int type, int ch, int note, int vel, struct snd_seq_event *ev); 31static int set_control_event(struct seq_oss_devinfo *dp, int dev, int type, int ch, int param, int val, struct snd_seq_event *ev); 32static int set_echo_event(struct seq_oss_devinfo *dp, union evrec *rec, struct snd_seq_event *ev); 33 34 35/* 36 * convert an OSS event to ALSA event 37 * return 0 : enqueued 38 * non-zero : invalid - ignored 39 */ 40 41int 42snd_seq_oss_process_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev) 43{ 44 switch (q->s.code) { 45 case SEQ_EXTENDED: 46 return extended_event(dp, q, ev); 47 48 case EV_CHN_VOICE: 49 return chn_voice_event(dp, q, ev); 50 51 case EV_CHN_COMMON: 52 return chn_common_event(dp, q, ev); 53 54 case EV_TIMING: 55 return timing_event(dp, q, ev); 56 57 case EV_SEQ_LOCAL: 58 return local_event(dp, q, ev); 59 60 case EV_SYSEX: 61 return snd_seq_oss_synth_sysex(dp, q->x.dev, q->x.buf, ev); 62 63 case SEQ_MIDIPUTC: 64 if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC) 65 return -EINVAL; 66 /* put a midi byte */ 67 if (! is_write_mode(dp->file_mode)) 68 break; 69 if (snd_seq_oss_midi_open(dp, q->s.dev, SNDRV_SEQ_OSS_FILE_WRITE)) 70 break; 71 if (snd_seq_oss_midi_filemode(dp, q->s.dev) & SNDRV_SEQ_OSS_FILE_WRITE) 72 return snd_seq_oss_midi_putc(dp, q->s.dev, q->s.parm1, ev); 73 break; 74 75 case SEQ_ECHO: 76 if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC) 77 return -EINVAL; 78 return set_echo_event(dp, q, ev); 79 80 case SEQ_PRIVATE: 81 if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC) 82 return -EINVAL; 83 return snd_seq_oss_synth_raw_event(dp, q->c[1], q->c, ev); 84 85 default: 86 if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC) 87 return -EINVAL; 88 return old_event(dp, q, ev); 89 } 90 return -EINVAL; 91} 92 93/* old type events: mode1 only */ 94static int 95old_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev) 96{ 97 switch (q->s.code) { 98 case SEQ_NOTEOFF: 99 return note_off_event(dp, 0, q->n.chn, q->n.note, q->n.vel, ev); 100 101 case SEQ_NOTEON: 102 return note_on_event(dp, 0, q->n.chn, q->n.note, q->n.vel, ev); 103 104 case SEQ_WAIT: 105 /* skip */ 106 break; 107 108 case SEQ_PGMCHANGE: 109 return set_control_event(dp, 0, SNDRV_SEQ_EVENT_PGMCHANGE, 110 q->n.chn, 0, q->n.note, ev); 111 112 case SEQ_SYNCTIMER: 113 return snd_seq_oss_timer_reset(dp->timer); 114 } 115 116 return -EINVAL; 117} 118 119/* 8bytes extended event: mode1 only */ 120static int 121extended_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev) 122{ 123 int val; 124 125 switch (q->e.cmd) { 126 case SEQ_NOTEOFF: 127 return note_off_event(dp, q->e.dev, q->e.chn, q->e.p1, q->e.p2, ev); 128 129 case SEQ_NOTEON: 130 return note_on_event(dp, q->e.dev, q->e.chn, q->e.p1, q->e.p2, ev); 131 132 case SEQ_PGMCHANGE: 133 return set_control_event(dp, q->e.dev, SNDRV_SEQ_EVENT_PGMCHANGE, 134 q->e.chn, 0, q->e.p1, ev); 135 136 case SEQ_AFTERTOUCH: 137 return set_control_event(dp, q->e.dev, SNDRV_SEQ_EVENT_CHANPRESS, 138 q->e.chn, 0, q->e.p1, ev); 139 140 case SEQ_BALANCE: 141 /* convert -128:127 to 0:127 */ 142 val = (char)q->e.p1; 143 val = (val + 128) / 2; 144 return set_control_event(dp, q->e.dev, SNDRV_SEQ_EVENT_CONTROLLER, 145 q->e.chn, CTL_PAN, val, ev); 146 147 case SEQ_CONTROLLER: 148 val = ((short)q->e.p3 << 8) | (short)q->e.p2; 149 switch (q->e.p1) { 150 case CTRL_PITCH_BENDER: /* SEQ1 V2 control */ 151 /* -0x2000:0x1fff */ 152 return set_control_event(dp, q->e.dev, 153 SNDRV_SEQ_EVENT_PITCHBEND, 154 q->e.chn, 0, val, ev); 155 case CTRL_PITCH_BENDER_RANGE: 156 /* conversion: 100/semitone -> 128/semitone */ 157 return set_control_event(dp, q->e.dev, 158 SNDRV_SEQ_EVENT_REGPARAM, 159 q->e.chn, 0, val*128/100, ev); 160 default: 161 return set_control_event(dp, q->e.dev, 162 SNDRV_SEQ_EVENT_CONTROL14, 163 q->e.chn, q->e.p1, val, ev); 164 } 165 166 case SEQ_VOLMODE: 167 return snd_seq_oss_synth_raw_event(dp, q->e.dev, q->c, ev); 168 169 } 170 return -EINVAL; 171} 172 173/* channel voice events: mode1 and 2 */ 174static int 175chn_voice_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev) 176{ 177 if (q->v.chn >= 32) 178 return -EINVAL; 179 switch (q->v.cmd) { 180 case MIDI_NOTEON: 181 return note_on_event(dp, q->v.dev, q->v.chn, q->v.note, q->v.parm, ev); 182 183 case MIDI_NOTEOFF: 184 return note_off_event(dp, q->v.dev, q->v.chn, q->v.note, q->v.parm, ev); 185 186 case MIDI_KEY_PRESSURE: 187 return set_note_event(dp, q->v.dev, SNDRV_SEQ_EVENT_KEYPRESS, 188 q->v.chn, q->v.note, q->v.parm, ev); 189 190 } 191 return -EINVAL; 192} 193 194/* channel common events: mode1 and 2 */ 195static int 196chn_common_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev) 197{ 198 if (q->l.chn >= 32) 199 return -EINVAL; 200 switch (q->l.cmd) { 201 case MIDI_PGM_CHANGE: 202 return set_control_event(dp, q->l.dev, SNDRV_SEQ_EVENT_PGMCHANGE, 203 q->l.chn, 0, q->l.p1, ev); 204 205 case MIDI_CTL_CHANGE: 206 return set_control_event(dp, q->l.dev, SNDRV_SEQ_EVENT_CONTROLLER, 207 q->l.chn, q->l.p1, q->l.val, ev); 208 209 case MIDI_PITCH_BEND: 210 /* conversion: 0:0x3fff -> -0x2000:0x1fff */ 211 return set_control_event(dp, q->l.dev, SNDRV_SEQ_EVENT_PITCHBEND, 212 q->l.chn, 0, q->l.val - 8192, ev); 213 214 case MIDI_CHN_PRESSURE: 215 return set_control_event(dp, q->l.dev, SNDRV_SEQ_EVENT_CHANPRESS, 216 q->l.chn, 0, q->l.val, ev); 217 } 218 return -EINVAL; 219} 220 221/* timer events: mode1 and mode2 */ 222static int 223timing_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev) 224{ 225 switch (q->t.cmd) { 226 case TMR_ECHO: 227 if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC) 228 return set_echo_event(dp, q, ev); 229 else { 230 union evrec tmp; 231 memset(&tmp, 0, sizeof(tmp)); 232 /* XXX: only for little-endian! */ 233 tmp.echo = (q->t.time << 8) | SEQ_ECHO; 234 return set_echo_event(dp, &tmp, ev); 235 } 236 237 case TMR_STOP: 238 if (dp->seq_mode) 239 return snd_seq_oss_timer_stop(dp->timer); 240 return 0; 241 242 case TMR_CONTINUE: 243 if (dp->seq_mode) 244 return snd_seq_oss_timer_continue(dp->timer); 245 return 0; 246 247 case TMR_TEMPO: 248 if (dp->seq_mode) 249 return snd_seq_oss_timer_tempo(dp->timer, q->t.time); 250 return 0; 251 } 252 253 return -EINVAL; 254} 255 256/* local events: mode1 and 2 */ 257static int 258local_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev) 259{ 260 return -EINVAL; 261} 262 263/* 264 * process note-on event for OSS synth 265 * three different modes are available: 266 * - SNDRV_SEQ_OSS_PROCESS_EVENTS (for one-voice per channel mode) 267 * Accept note 255 as volume change. 268 * - SNDRV_SEQ_OSS_PASS_EVENTS 269 * Pass all events to lowlevel driver anyway 270 * - SNDRV_SEQ_OSS_PROCESS_KEYPRESS (mostly for Emu8000) 271 * Use key-pressure if note >= 128 272 */ 273static int 274note_on_event(struct seq_oss_devinfo *dp, int dev, int ch, int note, int vel, struct snd_seq_event *ev) 275{ 276 struct seq_oss_synthinfo *info; 277 278 info = snd_seq_oss_synth_info(dp, dev); 279 if (!info) 280 return -ENXIO; 281 282 switch (info->arg.event_passing) { 283 case SNDRV_SEQ_OSS_PROCESS_EVENTS: 284 if (! info->ch || ch < 0 || ch >= info->nr_voices) { 285 /* pass directly */ 286 return set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEON, ch, note, vel, ev); 287 } 288 289 ch = array_index_nospec(ch, info->nr_voices); 290 if (note == 255 && info->ch[ch].note >= 0) { 291 /* volume control */ 292 int type; 293 //if (! vel) 294 /* set volume to zero -- note off */ 295 // type = SNDRV_SEQ_EVENT_NOTEOFF; 296 //else 297 if (info->ch[ch].vel) 298 /* sample already started -- volume change */ 299 type = SNDRV_SEQ_EVENT_KEYPRESS; 300 else 301 /* sample not started -- start now */ 302 type = SNDRV_SEQ_EVENT_NOTEON; 303 info->ch[ch].vel = vel; 304 return set_note_event(dp, dev, type, ch, info->ch[ch].note, vel, ev); 305 } else if (note >= 128) 306 return -EINVAL; /* invalid */ 307 308 if (note != info->ch[ch].note && info->ch[ch].note >= 0) 309 /* note changed - note off at beginning */ 310 set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEOFF, ch, info->ch[ch].note, 0, ev); 311 /* set current status */ 312 info->ch[ch].note = note; 313 info->ch[ch].vel = vel; 314 if (vel) /* non-zero velocity - start the note now */ 315 return set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEON, ch, note, vel, ev); 316 return -EINVAL; 317 318 case SNDRV_SEQ_OSS_PASS_EVENTS: 319 /* pass the event anyway */ 320 return set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEON, ch, note, vel, ev); 321 322 case SNDRV_SEQ_OSS_PROCESS_KEYPRESS: 323 if (note >= 128) /* key pressure: shifted by 128 */ 324 return set_note_event(dp, dev, SNDRV_SEQ_EVENT_KEYPRESS, ch, note - 128, vel, ev); 325 else /* normal note-on event */ 326 return set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEON, ch, note, vel, ev); 327 } 328 return -EINVAL; 329} 330 331/* 332 * process note-off event for OSS synth 333 */ 334static int 335note_off_event(struct seq_oss_devinfo *dp, int dev, int ch, int note, int vel, struct snd_seq_event *ev) 336{ 337 struct seq_oss_synthinfo *info; 338 339 info = snd_seq_oss_synth_info(dp, dev); 340 if (!info) 341 return -ENXIO; 342 343 switch (info->arg.event_passing) { 344 case SNDRV_SEQ_OSS_PROCESS_EVENTS: 345 if (! info->ch || ch < 0 || ch >= info->nr_voices) { 346 /* pass directly */ 347 return set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEON, ch, note, vel, ev); 348 } 349 350 ch = array_index_nospec(ch, info->nr_voices); 351 if (info->ch[ch].note >= 0) { 352 note = info->ch[ch].note; 353 info->ch[ch].vel = 0; 354 info->ch[ch].note = -1; 355 return set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEOFF, ch, note, vel, ev); 356 } 357 return -EINVAL; /* invalid */ 358 359 case SNDRV_SEQ_OSS_PASS_EVENTS: 360 case SNDRV_SEQ_OSS_PROCESS_KEYPRESS: 361 /* pass the event anyway */ 362 return set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEOFF, ch, note, vel, ev); 363 364 } 365 return -EINVAL; 366} 367 368/* 369 * create a note event 370 */ 371static int 372set_note_event(struct seq_oss_devinfo *dp, int dev, int type, int ch, int note, int vel, struct snd_seq_event *ev) 373{ 374 if (!snd_seq_oss_synth_info(dp, dev)) 375 return -ENXIO; 376 377 ev->type = type; 378 snd_seq_oss_synth_addr(dp, dev, ev); 379 ev->data.note.channel = ch; 380 ev->data.note.note = note; 381 ev->data.note.velocity = vel; 382 383 return 0; 384} 385 386/* 387 * create a control event 388 */ 389static int 390set_control_event(struct seq_oss_devinfo *dp, int dev, int type, int ch, int param, int val, struct snd_seq_event *ev) 391{ 392 if (!snd_seq_oss_synth_info(dp, dev)) 393 return -ENXIO; 394 395 ev->type = type; 396 snd_seq_oss_synth_addr(dp, dev, ev); 397 ev->data.control.channel = ch; 398 ev->data.control.param = param; 399 ev->data.control.value = val; 400 401 return 0; 402} 403 404/* 405 * create an echo event 406 */ 407static int 408set_echo_event(struct seq_oss_devinfo *dp, union evrec *rec, struct snd_seq_event *ev) 409{ 410 ev->type = SNDRV_SEQ_EVENT_ECHO; 411 /* echo back to itself */ 412 snd_seq_oss_fill_addr(dp, ev, dp->addr.client, dp->addr.port); 413 memcpy(&ev->data, rec, LONG_EVENT_SIZE); 414 return 0; 415} 416 417/* 418 * event input callback from ALSA sequencer: 419 * the echo event is processed here. 420 */ 421int 422snd_seq_oss_event_input(struct snd_seq_event *ev, int direct, void *private_data, 423 int atomic, int hop) 424{ 425 struct seq_oss_devinfo *dp = (struct seq_oss_devinfo *)private_data; 426 union evrec *rec; 427 428 if (ev->type != SNDRV_SEQ_EVENT_ECHO) 429 return snd_seq_oss_midi_input(ev, direct, private_data); 430 431 if (ev->source.client != dp->cseq) 432 return 0; /* ignored */ 433 434 rec = (union evrec*)&ev->data; 435 if (rec->s.code == SEQ_SYNCTIMER) { 436 /* sync echo back */ 437 snd_seq_oss_writeq_wakeup(dp->writeq, rec->t.time); 438 439 } else { 440 /* echo back event */ 441 if (dp->readq == NULL) 442 return 0; 443 snd_seq_oss_readq_put_event(dp->readq, rec); 444 } 445 return 0; 446} 447 448