1 /* 2 * pcm emulation on emu8000 wavetable 3 * 4 * Copyright (C) 2002 Takashi Iwai <tiwai@suse.de> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 */ 20 21 #include "emu8000_local.h" 22 #include <linux/init.h> 23 #include <sound/initval.h> 24 #include <sound/pcm.h> 25 26 /* 27 * define the following if you want to use this pcm with non-interleaved mode 28 */ 29 /* #define USE_NONINTERLEAVE */ 30 31 /* NOTE: for using the non-interleaved mode with alsa-lib, you have to set 32 * mmap_emulation flag to 1 in your .asoundrc, such like 33 * 34 * pcm.emu8k { 35 * type plug 36 * slave.pcm { 37 * type hw 38 * card 0 39 * device 1 40 * mmap_emulation 1 41 * } 42 * } 43 * 44 * besides, for the time being, the non-interleaved mode doesn't work well on 45 * alsa-lib... 46 */ 47 48 49 typedef struct snd_emu8k_pcm emu8k_pcm_t; 50 51 struct snd_emu8k_pcm { 52 emu8000_t *emu; 53 snd_pcm_substream_t *substream; 54 55 unsigned int allocated_bytes; 56 snd_util_memblk_t *block; 57 unsigned int offset; 58 unsigned int buf_size; 59 unsigned int period_size; 60 unsigned int loop_start[2]; 61 unsigned int pitch; 62 int panning[2]; 63 int last_ptr; 64 int period_pos; 65 int voices; 66 unsigned int dram_opened: 1; 67 unsigned int running: 1; 68 unsigned int timer_running: 1; 69 struct timer_list timer; 70 spinlock_t timer_lock; 71 }; 72 73 #define LOOP_BLANK_SIZE 8 74 75 76 /* 77 * open up channels for the simultaneous data transfer and playback 78 */ 79 static int 80 emu8k_open_dram_for_pcm(emu8000_t *emu, int channels) 81 { 82 int i; 83 84 /* reserve up to 2 voices for playback */ 85 snd_emux_lock_voice(emu->emu, 0); 86 if (channels > 1) 87 snd_emux_lock_voice(emu->emu, 1); 88 89 /* reserve 28 voices for loading */ 90 for (i = channels + 1; i < EMU8000_DRAM_VOICES; i++) { 91 unsigned int mode = EMU8000_RAM_WRITE; 92 snd_emux_lock_voice(emu->emu, i); 93 #ifndef USE_NONINTERLEAVE 94 if (channels > 1 && (i & 1) != 0) 95 mode |= EMU8000_RAM_RIGHT; 96 #endif 97 snd_emu8000_dma_chan(emu, i, mode); 98 } 99 100 /* assign voice 31 and 32 to ROM */ 101 EMU8000_VTFT_WRITE(emu, 30, 0); 102 EMU8000_PSST_WRITE(emu, 30, 0x1d8); 103 EMU8000_CSL_WRITE(emu, 30, 0x1e0); 104 EMU8000_CCCA_WRITE(emu, 30, 0x1d8); 105 EMU8000_VTFT_WRITE(emu, 31, 0); 106 EMU8000_PSST_WRITE(emu, 31, 0x1d8); 107 EMU8000_CSL_WRITE(emu, 31, 0x1e0); 108 EMU8000_CCCA_WRITE(emu, 31, 0x1d8); 109 110 return 0; 111 } 112 113 /* 114 */ 115 static void 116 snd_emu8000_write_wait(emu8000_t *emu, int can_schedule) 117 { 118 while ((EMU8000_SMALW_READ(emu) & 0x80000000) != 0) { 119 if (can_schedule) { 120 schedule_timeout_interruptible(1); 121 if (signal_pending(current)) 122 break; 123 } 124 } 125 } 126 127 /* 128 * close all channels 129 */ 130 static void 131 emu8k_close_dram(emu8000_t *emu) 132 { 133 int i; 134 135 for (i = 0; i < 2; i++) 136 snd_emux_unlock_voice(emu->emu, i); 137 for (; i < EMU8000_DRAM_VOICES; i++) { 138 snd_emu8000_dma_chan(emu, i, EMU8000_RAM_CLOSE); 139 snd_emux_unlock_voice(emu->emu, i); 140 } 141 } 142 143 /* 144 * convert Hz to AWE32 rate offset (see emux/soundfont.c) 145 */ 146 147 #define OFFSET_SAMPLERATE 1011119 /* base = 44100 */ 148 #define SAMPLERATE_RATIO 4096 149 150 static int calc_rate_offset(int hz) 151 { 152 return snd_sf_linear_to_log(hz, OFFSET_SAMPLERATE, SAMPLERATE_RATIO); 153 } 154 155 156 /* 157 */ 158 159 static snd_pcm_hardware_t emu8k_pcm_hw = { 160 #ifdef USE_NONINTERLEAVE 161 .info = SNDRV_PCM_INFO_NONINTERLEAVED, 162 #else 163 .info = SNDRV_PCM_INFO_INTERLEAVED, 164 #endif 165 .formats = SNDRV_PCM_FMTBIT_S16_LE, 166 .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000, 167 .rate_min = 4000, 168 .rate_max = 48000, 169 .channels_min = 1, 170 .channels_max = 2, 171 .buffer_bytes_max = (128*1024), 172 .period_bytes_min = 1024, 173 .period_bytes_max = (128*1024), 174 .periods_min = 2, 175 .periods_max = 1024, 176 .fifo_size = 0, 177 178 }; 179 180 /* 181 * get the current position at the given channel from CCCA register 182 */ 183 static inline int emu8k_get_curpos(emu8k_pcm_t *rec, int ch) 184 { 185 int val = EMU8000_CCCA_READ(rec->emu, ch) & 0xfffffff; 186 val -= rec->loop_start[ch] - 1; 187 return val; 188 } 189 190 191 /* 192 * timer interrupt handler 193 * check the current position and update the period if necessary. 194 */ 195 static void emu8k_pcm_timer_func(unsigned long data) 196 { 197 emu8k_pcm_t *rec = (emu8k_pcm_t *)data; 198 int ptr, delta; 199 200 spin_lock(&rec->timer_lock); 201 /* update the current pointer */ 202 ptr = emu8k_get_curpos(rec, 0); 203 if (ptr < rec->last_ptr) 204 delta = ptr + rec->buf_size - rec->last_ptr; 205 else 206 delta = ptr - rec->last_ptr; 207 rec->period_pos += delta; 208 rec->last_ptr = ptr; 209 210 /* reprogram timer */ 211 rec->timer.expires = jiffies + 1; 212 add_timer(&rec->timer); 213 214 /* update period */ 215 if (rec->period_pos >= (int)rec->period_size) { 216 rec->period_pos %= rec->period_size; 217 spin_unlock(&rec->timer_lock); 218 snd_pcm_period_elapsed(rec->substream); 219 return; 220 } 221 spin_unlock(&rec->timer_lock); 222 } 223 224 225 /* 226 * open pcm 227 * creating an instance here 228 */ 229 static int emu8k_pcm_open(snd_pcm_substream_t *subs) 230 { 231 emu8000_t *emu = snd_pcm_substream_chip(subs); 232 emu8k_pcm_t *rec; 233 snd_pcm_runtime_t *runtime = subs->runtime; 234 235 rec = kzalloc(sizeof(*rec), GFP_KERNEL); 236 if (! rec) 237 return -ENOMEM; 238 239 rec->emu = emu; 240 rec->substream = subs; 241 runtime->private_data = rec; 242 243 spin_lock_init(&rec->timer_lock); 244 init_timer(&rec->timer); 245 rec->timer.function = emu8k_pcm_timer_func; 246 rec->timer.data = (unsigned long)rec; 247 248 runtime->hw = emu8k_pcm_hw; 249 runtime->hw.buffer_bytes_max = emu->mem_size - LOOP_BLANK_SIZE * 3; 250 runtime->hw.period_bytes_max = runtime->hw.buffer_bytes_max / 2; 251 252 /* use timer to update periods.. (specified in msec) */ 253 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 254 (1000000 + HZ - 1) / HZ, UINT_MAX); 255 256 return 0; 257 } 258 259 static int emu8k_pcm_close(snd_pcm_substream_t *subs) 260 { 261 emu8k_pcm_t *rec = subs->runtime->private_data; 262 kfree(rec); 263 subs->runtime->private_data = NULL; 264 return 0; 265 } 266 267 /* 268 * calculate pitch target 269 */ 270 static int calc_pitch_target(int pitch) 271 { 272 int ptarget = 1 << (pitch >> 12); 273 if (pitch & 0x800) ptarget += (ptarget * 0x102e) / 0x2710; 274 if (pitch & 0x400) ptarget += (ptarget * 0x764) / 0x2710; 275 if (pitch & 0x200) ptarget += (ptarget * 0x389) / 0x2710; 276 ptarget += (ptarget >> 1); 277 if (ptarget > 0xffff) ptarget = 0xffff; 278 return ptarget; 279 } 280 281 /* 282 * set up the voice 283 */ 284 static void setup_voice(emu8k_pcm_t *rec, int ch) 285 { 286 emu8000_t *hw = rec->emu; 287 unsigned int temp; 288 289 /* channel to be silent and idle */ 290 EMU8000_DCYSUSV_WRITE(hw, ch, 0x0080); 291 EMU8000_VTFT_WRITE(hw, ch, 0x0000FFFF); 292 EMU8000_CVCF_WRITE(hw, ch, 0x0000FFFF); 293 EMU8000_PTRX_WRITE(hw, ch, 0); 294 EMU8000_CPF_WRITE(hw, ch, 0); 295 296 /* pitch offset */ 297 EMU8000_IP_WRITE(hw, ch, rec->pitch); 298 /* set envelope parameters */ 299 EMU8000_ENVVAL_WRITE(hw, ch, 0x8000); 300 EMU8000_ATKHLD_WRITE(hw, ch, 0x7f7f); 301 EMU8000_DCYSUS_WRITE(hw, ch, 0x7f7f); 302 EMU8000_ENVVOL_WRITE(hw, ch, 0x8000); 303 EMU8000_ATKHLDV_WRITE(hw, ch, 0x7f7f); 304 /* decay/sustain parameter for volume envelope is used 305 for triggerg the voice */ 306 /* modulation envelope heights */ 307 EMU8000_PEFE_WRITE(hw, ch, 0x0); 308 /* lfo1/2 delay */ 309 EMU8000_LFO1VAL_WRITE(hw, ch, 0x8000); 310 EMU8000_LFO2VAL_WRITE(hw, ch, 0x8000); 311 /* lfo1 pitch & cutoff shift */ 312 EMU8000_FMMOD_WRITE(hw, ch, 0); 313 /* lfo1 volume & freq */ 314 EMU8000_TREMFRQ_WRITE(hw, ch, 0); 315 /* lfo2 pitch & freq */ 316 EMU8000_FM2FRQ2_WRITE(hw, ch, 0); 317 /* pan & loop start */ 318 temp = rec->panning[ch]; 319 temp = (temp <<24) | ((unsigned int)rec->loop_start[ch] - 1); 320 EMU8000_PSST_WRITE(hw, ch, temp); 321 /* chorus & loop end (chorus 8bit, MSB) */ 322 temp = 0; // chorus 323 temp = (temp << 24) | ((unsigned int)rec->loop_start[ch] + rec->buf_size - 1); 324 EMU8000_CSL_WRITE(hw, ch, temp); 325 /* Q & current address (Q 4bit value, MSB) */ 326 temp = 0; // filterQ 327 temp = (temp << 28) | ((unsigned int)rec->loop_start[ch] - 1); 328 EMU8000_CCCA_WRITE(hw, ch, temp); 329 /* clear unknown registers */ 330 EMU8000_00A0_WRITE(hw, ch, 0); 331 EMU8000_0080_WRITE(hw, ch, 0); 332 } 333 334 /* 335 * trigger the voice 336 */ 337 static void start_voice(emu8k_pcm_t *rec, int ch) 338 { 339 unsigned long flags; 340 emu8000_t *hw = rec->emu; 341 unsigned int temp, aux; 342 int pt = calc_pitch_target(rec->pitch); 343 344 /* cutoff and volume */ 345 EMU8000_IFATN_WRITE(hw, ch, 0xff00); 346 EMU8000_VTFT_WRITE(hw, ch, 0xffff); 347 EMU8000_CVCF_WRITE(hw, ch, 0xffff); 348 /* trigger envelope */ 349 EMU8000_DCYSUSV_WRITE(hw, ch, 0x7f7f); 350 /* set reverb and pitch target */ 351 temp = 0; // reverb 352 if (rec->panning[ch] == 0) 353 aux = 0xff; 354 else 355 aux = (-rec->panning[ch]) & 0xff; 356 temp = (temp << 8) | (pt << 16) | aux; 357 EMU8000_PTRX_WRITE(hw, ch, temp); 358 EMU8000_CPF_WRITE(hw, ch, pt << 16); 359 360 /* start timer */ 361 spin_lock_irqsave(&rec->timer_lock, flags); 362 if (! rec->timer_running) { 363 rec->timer.expires = jiffies + 1; 364 add_timer(&rec->timer); 365 rec->timer_running = 1; 366 } 367 spin_unlock_irqrestore(&rec->timer_lock, flags); 368 } 369 370 /* 371 * stop the voice immediately 372 */ 373 static void stop_voice(emu8k_pcm_t *rec, int ch) 374 { 375 unsigned long flags; 376 emu8000_t *hw = rec->emu; 377 378 EMU8000_DCYSUSV_WRITE(hw, ch, 0x807F); 379 380 /* stop timer */ 381 spin_lock_irqsave(&rec->timer_lock, flags); 382 if (rec->timer_running) { 383 del_timer(&rec->timer); 384 rec->timer_running = 0; 385 } 386 spin_unlock_irqrestore(&rec->timer_lock, flags); 387 } 388 389 static int emu8k_pcm_trigger(snd_pcm_substream_t *subs, int cmd) 390 { 391 emu8k_pcm_t *rec = subs->runtime->private_data; 392 int ch; 393 394 switch (cmd) { 395 case SNDRV_PCM_TRIGGER_START: 396 for (ch = 0; ch < rec->voices; ch++) 397 start_voice(rec, ch); 398 rec->running = 1; 399 break; 400 case SNDRV_PCM_TRIGGER_STOP: 401 rec->running = 0; 402 for (ch = 0; ch < rec->voices; ch++) 403 stop_voice(rec, ch); 404 break; 405 default: 406 return -EINVAL; 407 } 408 return 0; 409 } 410 411 412 /* 413 * copy / silence ops 414 */ 415 416 /* 417 * this macro should be inserted in the copy/silence loops 418 * to reduce the latency. without this, the system will hang up 419 * during the whole loop. 420 */ 421 #define CHECK_SCHEDULER() \ 422 do { \ 423 cond_resched();\ 424 if (signal_pending(current))\ 425 return -EAGAIN;\ 426 } while (0) 427 428 429 #ifdef USE_NONINTERLEAVE 430 /* copy one channel block */ 431 static int emu8k_transfer_block(emu8000_t *emu, int offset, unsigned short *buf, int count) 432 { 433 EMU8000_SMALW_WRITE(emu, offset); 434 while (count > 0) { 435 unsigned short sval; 436 CHECK_SCHEDULER(); 437 get_user(sval, buf); 438 EMU8000_SMLD_WRITE(emu, sval); 439 buf++; 440 count--; 441 } 442 return 0; 443 } 444 445 static int emu8k_pcm_copy(snd_pcm_substream_t *subs, 446 int voice, 447 snd_pcm_uframes_t pos, 448 void *src, 449 snd_pcm_uframes_t count) 450 { 451 emu8k_pcm_t *rec = subs->runtime->private_data; 452 emu8000_t *emu = rec->emu; 453 454 snd_emu8000_write_wait(emu, 1); 455 if (voice == -1) { 456 unsigned short *buf = src; 457 int i, err; 458 count /= rec->voices; 459 for (i = 0; i < rec->voices; i++) { 460 err = emu8k_transfer_block(emu, pos + rec->loop_start[i], buf, count); 461 if (err < 0) 462 return err; 463 buf += count; 464 } 465 return 0; 466 } else { 467 return emu8k_transfer_block(emu, pos + rec->loop_start[voice], src, count); 468 } 469 } 470 471 /* make a channel block silence */ 472 static int emu8k_silence_block(emu8000_t *emu, int offset, int count) 473 { 474 EMU8000_SMALW_WRITE(emu, offset); 475 while (count > 0) { 476 CHECK_SCHEDULER(); 477 EMU8000_SMLD_WRITE(emu, 0); 478 count--; 479 } 480 return 0; 481 } 482 483 static int emu8k_pcm_silence(snd_pcm_substream_t *subs, 484 int voice, 485 snd_pcm_uframes_t pos, 486 snd_pcm_uframes_t count) 487 { 488 emu8k_pcm_t *rec = subs->runtime->private_data; 489 emu8000_t *emu = rec->emu; 490 491 snd_emu8000_write_wait(emu, 1); 492 if (voice == -1 && rec->voices == 1) 493 voice = 0; 494 if (voice == -1) { 495 int err; 496 err = emu8k_silence_block(emu, pos + rec->loop_start[0], count / 2); 497 if (err < 0) 498 return err; 499 return emu8k_silence_block(emu, pos + rec->loop_start[1], count / 2); 500 } else { 501 return emu8k_silence_block(emu, pos + rec->loop_start[voice], count); 502 } 503 } 504 505 #else /* interleave */ 506 507 /* 508 * copy the interleaved data can be done easily by using 509 * DMA "left" and "right" channels on emu8k engine. 510 */ 511 static int emu8k_pcm_copy(snd_pcm_substream_t *subs, 512 int voice, 513 snd_pcm_uframes_t pos, 514 void __user *src, 515 snd_pcm_uframes_t count) 516 { 517 emu8k_pcm_t *rec = subs->runtime->private_data; 518 emu8000_t *emu = rec->emu; 519 unsigned short __user *buf = src; 520 521 snd_emu8000_write_wait(emu, 1); 522 EMU8000_SMALW_WRITE(emu, pos + rec->loop_start[0]); 523 if (rec->voices > 1) 524 EMU8000_SMARW_WRITE(emu, pos + rec->loop_start[1]); 525 526 while (count-- > 0) { 527 unsigned short sval; 528 CHECK_SCHEDULER(); 529 get_user(sval, buf); 530 EMU8000_SMLD_WRITE(emu, sval); 531 buf++; 532 if (rec->voices > 1) { 533 CHECK_SCHEDULER(); 534 get_user(sval, buf); 535 EMU8000_SMRD_WRITE(emu, sval); 536 buf++; 537 } 538 } 539 return 0; 540 } 541 542 static int emu8k_pcm_silence(snd_pcm_substream_t *subs, 543 int voice, 544 snd_pcm_uframes_t pos, 545 snd_pcm_uframes_t count) 546 { 547 emu8k_pcm_t *rec = subs->runtime->private_data; 548 emu8000_t *emu = rec->emu; 549 550 snd_emu8000_write_wait(emu, 1); 551 EMU8000_SMALW_WRITE(emu, rec->loop_start[0] + pos); 552 if (rec->voices > 1) 553 EMU8000_SMARW_WRITE(emu, rec->loop_start[1] + pos); 554 while (count-- > 0) { 555 CHECK_SCHEDULER(); 556 EMU8000_SMLD_WRITE(emu, 0); 557 if (rec->voices > 1) { 558 CHECK_SCHEDULER(); 559 EMU8000_SMRD_WRITE(emu, 0); 560 } 561 } 562 return 0; 563 } 564 #endif 565 566 567 /* 568 * allocate a memory block 569 */ 570 static int emu8k_pcm_hw_params(snd_pcm_substream_t *subs, 571 snd_pcm_hw_params_t *hw_params) 572 { 573 emu8k_pcm_t *rec = subs->runtime->private_data; 574 575 if (rec->block) { 576 /* reallocation - release the old block */ 577 snd_util_mem_free(rec->emu->memhdr, rec->block); 578 rec->block = NULL; 579 } 580 581 rec->allocated_bytes = params_buffer_bytes(hw_params) + LOOP_BLANK_SIZE * 4; 582 rec->block = snd_util_mem_alloc(rec->emu->memhdr, rec->allocated_bytes); 583 if (! rec->block) 584 return -ENOMEM; 585 rec->offset = EMU8000_DRAM_OFFSET + (rec->block->offset >> 1); /* in word */ 586 /* at least dma_bytes must be set for non-interleaved mode */ 587 subs->dma_buffer.bytes = params_buffer_bytes(hw_params); 588 589 return 0; 590 } 591 592 /* 593 * free the memory block 594 */ 595 static int emu8k_pcm_hw_free(snd_pcm_substream_t *subs) 596 { 597 emu8k_pcm_t *rec = subs->runtime->private_data; 598 599 if (rec->block) { 600 int ch; 601 for (ch = 0; ch < rec->voices; ch++) 602 stop_voice(rec, ch); // to be sure 603 if (rec->dram_opened) 604 emu8k_close_dram(rec->emu); 605 snd_util_mem_free(rec->emu->memhdr, rec->block); 606 rec->block = NULL; 607 } 608 return 0; 609 } 610 611 /* 612 */ 613 static int emu8k_pcm_prepare(snd_pcm_substream_t *subs) 614 { 615 emu8k_pcm_t *rec = subs->runtime->private_data; 616 617 rec->pitch = 0xe000 + calc_rate_offset(subs->runtime->rate); 618 rec->last_ptr = 0; 619 rec->period_pos = 0; 620 621 rec->buf_size = subs->runtime->buffer_size; 622 rec->period_size = subs->runtime->period_size; 623 rec->voices = subs->runtime->channels; 624 rec->loop_start[0] = rec->offset + LOOP_BLANK_SIZE; 625 if (rec->voices > 1) 626 rec->loop_start[1] = rec->loop_start[0] + rec->buf_size + LOOP_BLANK_SIZE; 627 if (rec->voices > 1) { 628 rec->panning[0] = 0xff; 629 rec->panning[1] = 0x00; 630 } else 631 rec->panning[0] = 0x80; 632 633 if (! rec->dram_opened) { 634 int err, i, ch; 635 636 snd_emux_terminate_all(rec->emu->emu); 637 if ((err = emu8k_open_dram_for_pcm(rec->emu, rec->voices)) != 0) 638 return err; 639 rec->dram_opened = 1; 640 641 /* clear loop blanks */ 642 snd_emu8000_write_wait(rec->emu, 0); 643 EMU8000_SMALW_WRITE(rec->emu, rec->offset); 644 for (i = 0; i < LOOP_BLANK_SIZE; i++) 645 EMU8000_SMLD_WRITE(rec->emu, 0); 646 for (ch = 0; ch < rec->voices; ch++) { 647 EMU8000_SMALW_WRITE(rec->emu, rec->loop_start[ch] + rec->buf_size); 648 for (i = 0; i < LOOP_BLANK_SIZE; i++) 649 EMU8000_SMLD_WRITE(rec->emu, 0); 650 } 651 } 652 653 setup_voice(rec, 0); 654 if (rec->voices > 1) 655 setup_voice(rec, 1); 656 return 0; 657 } 658 659 static snd_pcm_uframes_t emu8k_pcm_pointer(snd_pcm_substream_t *subs) 660 { 661 emu8k_pcm_t *rec = subs->runtime->private_data; 662 if (rec->running) 663 return emu8k_get_curpos(rec, 0); 664 return 0; 665 } 666 667 668 static snd_pcm_ops_t emu8k_pcm_ops = { 669 .open = emu8k_pcm_open, 670 .close = emu8k_pcm_close, 671 .ioctl = snd_pcm_lib_ioctl, 672 .hw_params = emu8k_pcm_hw_params, 673 .hw_free = emu8k_pcm_hw_free, 674 .prepare = emu8k_pcm_prepare, 675 .trigger = emu8k_pcm_trigger, 676 .pointer = emu8k_pcm_pointer, 677 .copy = emu8k_pcm_copy, 678 .silence = emu8k_pcm_silence, 679 }; 680 681 682 static void snd_emu8000_pcm_free(snd_pcm_t *pcm) 683 { 684 emu8000_t *emu = pcm->private_data; 685 emu->pcm = NULL; 686 } 687 688 int snd_emu8000_pcm_new(snd_card_t *card, emu8000_t *emu, int index) 689 { 690 snd_pcm_t *pcm; 691 int err; 692 693 if ((err = snd_pcm_new(card, "Emu8000 PCM", index, 1, 0, &pcm)) < 0) 694 return err; 695 pcm->private_data = emu; 696 pcm->private_free = snd_emu8000_pcm_free; 697 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &emu8k_pcm_ops); 698 emu->pcm = pcm; 699 700 snd_device_register(card, pcm); 701 702 return 0; 703 } 704