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 49struct snd_emu8k_pcm { 50 struct snd_emu8000 *emu; 51 struct snd_pcm_substream *substream; 52 53 unsigned int allocated_bytes; 54 struct snd_util_memblk *block; 55 unsigned int offset; 56 unsigned int buf_size; 57 unsigned int period_size; 58 unsigned int loop_start[2]; 59 unsigned int pitch; 60 int panning[2]; 61 int last_ptr; 62 int period_pos; 63 int voices; 64 unsigned int dram_opened: 1; 65 unsigned int running: 1; 66 unsigned int timer_running: 1; 67 struct timer_list timer; 68 spinlock_t timer_lock; 69}; 70 71#define LOOP_BLANK_SIZE 8 72 73 74/* 75 * open up channels for the simultaneous data transfer and playback 76 */ 77static int 78emu8k_open_dram_for_pcm(struct snd_emu8000 *emu, int channels) 79{ 80 int i; 81 82 /* reserve up to 2 voices for playback */ 83 snd_emux_lock_voice(emu->emu, 0); 84 if (channels > 1) 85 snd_emux_lock_voice(emu->emu, 1); 86 87 /* reserve 28 voices for loading */ 88 for (i = channels + 1; i < EMU8000_DRAM_VOICES; i++) { 89 unsigned int mode = EMU8000_RAM_WRITE; 90 snd_emux_lock_voice(emu->emu, i); 91#ifndef USE_NONINTERLEAVE 92 if (channels > 1 && (i & 1) != 0) 93 mode |= EMU8000_RAM_RIGHT; 94#endif 95 snd_emu8000_dma_chan(emu, i, mode); 96 } 97 98 /* assign voice 31 and 32 to ROM */ 99 EMU8000_VTFT_WRITE(emu, 30, 0); 100 EMU8000_PSST_WRITE(emu, 30, 0x1d8); 101 EMU8000_CSL_WRITE(emu, 30, 0x1e0); 102 EMU8000_CCCA_WRITE(emu, 30, 0x1d8); 103 EMU8000_VTFT_WRITE(emu, 31, 0); 104 EMU8000_PSST_WRITE(emu, 31, 0x1d8); 105 EMU8000_CSL_WRITE(emu, 31, 0x1e0); 106 EMU8000_CCCA_WRITE(emu, 31, 0x1d8); 107 108 return 0; 109} 110 111/* 112 */ 113static void 114snd_emu8000_write_wait(struct snd_emu8000 *emu, int can_schedule) 115{ 116 while ((EMU8000_SMALW_READ(emu) & 0x80000000) != 0) { 117 if (can_schedule) { 118 schedule_timeout_interruptible(1); 119 if (signal_pending(current)) 120 break; 121 } 122 } 123} 124 125/* 126 * close all channels 127 */ 128static void 129emu8k_close_dram(struct snd_emu8000 *emu) 130{ 131 int i; 132 133 for (i = 0; i < 2; i++) 134 snd_emux_unlock_voice(emu->emu, i); 135 for (; i < EMU8000_DRAM_VOICES; i++) { 136 snd_emu8000_dma_chan(emu, i, EMU8000_RAM_CLOSE); 137 snd_emux_unlock_voice(emu->emu, i); 138 } 139} 140 141/* 142 * convert Hz to AWE32 rate offset (see emux/soundfont.c) 143 */ 144 145#define OFFSET_SAMPLERATE 1011119 /* base = 44100 */ 146#define SAMPLERATE_RATIO 4096 147 148static int calc_rate_offset(int hz) 149{ 150 return snd_sf_linear_to_log(hz, OFFSET_SAMPLERATE, SAMPLERATE_RATIO); 151} 152 153 154/* 155 */ 156 157static struct snd_pcm_hardware emu8k_pcm_hw = { 158#ifdef USE_NONINTERLEAVE 159 .info = SNDRV_PCM_INFO_NONINTERLEAVED, 160#else 161 .info = SNDRV_PCM_INFO_INTERLEAVED, 162#endif 163 .formats = SNDRV_PCM_FMTBIT_S16_LE, 164 .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000, 165 .rate_min = 4000, 166 .rate_max = 48000, 167 .channels_min = 1, 168 .channels_max = 2, 169 .buffer_bytes_max = (128*1024), 170 .period_bytes_min = 1024, 171 .period_bytes_max = (128*1024), 172 .periods_min = 2, 173 .periods_max = 1024, 174 .fifo_size = 0, 175 176}; 177 178/* 179 * get the current position at the given channel from CCCA register 180 */ 181static inline int emu8k_get_curpos(struct snd_emu8k_pcm *rec, int ch) 182{ 183 int val = EMU8000_CCCA_READ(rec->emu, ch) & 0xfffffff; 184 val -= rec->loop_start[ch] - 1; 185 return val; 186} 187 188 189/* 190 * timer interrupt handler 191 * check the current position and update the period if necessary. 192 */ 193static void emu8k_pcm_timer_func(unsigned long data) 194{ 195 struct snd_emu8k_pcm *rec = (struct snd_emu8k_pcm *)data; 196 int ptr, delta; 197 198 spin_lock(&rec->timer_lock); 199 /* update the current pointer */ 200 ptr = emu8k_get_curpos(rec, 0); 201 if (ptr < rec->last_ptr) 202 delta = ptr + rec->buf_size - rec->last_ptr; 203 else 204 delta = ptr - rec->last_ptr; 205 rec->period_pos += delta; 206 rec->last_ptr = ptr; 207 208 /* reprogram timer */ 209 rec->timer.expires = jiffies + 1; 210 add_timer(&rec->timer); 211 212 /* update period */ 213 if (rec->period_pos >= (int)rec->period_size) { 214 rec->period_pos %= rec->period_size; 215 spin_unlock(&rec->timer_lock); 216 snd_pcm_period_elapsed(rec->substream); 217 return; 218 } 219 spin_unlock(&rec->timer_lock); 220} 221 222 223/* 224 * open pcm 225 * creating an instance here 226 */ 227static int emu8k_pcm_open(struct snd_pcm_substream *subs) 228{ 229 struct snd_emu8000 *emu = snd_pcm_substream_chip(subs); 230 struct snd_emu8k_pcm *rec; 231 struct snd_pcm_runtime *runtime = subs->runtime; 232 233 rec = kzalloc(sizeof(*rec), GFP_KERNEL); 234 if (! rec) 235 return -ENOMEM; 236 237 rec->emu = emu; 238 rec->substream = subs; 239 runtime->private_data = rec; 240 241 spin_lock_init(&rec->timer_lock); 242 init_timer(&rec->timer); 243 rec->timer.function = emu8k_pcm_timer_func; 244 rec->timer.data = (unsigned long)rec; 245 246 runtime->hw = emu8k_pcm_hw; 247 runtime->hw.buffer_bytes_max = emu->mem_size - LOOP_BLANK_SIZE * 3; 248 runtime->hw.period_bytes_max = runtime->hw.buffer_bytes_max / 2; 249 250 /* use timer to update periods.. (specified in msec) */ 251 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 252 (1000000 + HZ - 1) / HZ, UINT_MAX); 253 254 return 0; 255} 256 257static int emu8k_pcm_close(struct snd_pcm_substream *subs) 258{ 259 struct snd_emu8k_pcm *rec = subs->runtime->private_data; 260 kfree(rec); 261 subs->runtime->private_data = NULL; 262 return 0; 263} 264 265/* 266 * calculate pitch target 267 */ 268static int calc_pitch_target(int pitch) 269{ 270 int ptarget = 1 << (pitch >> 12); 271 if (pitch & 0x800) ptarget += (ptarget * 0x102e) / 0x2710; 272 if (pitch & 0x400) ptarget += (ptarget * 0x764) / 0x2710; 273 if (pitch & 0x200) ptarget += (ptarget * 0x389) / 0x2710; 274 ptarget += (ptarget >> 1); 275 if (ptarget > 0xffff) ptarget = 0xffff; 276 return ptarget; 277} 278 279/* 280 * set up the voice 281 */ 282static void setup_voice(struct snd_emu8k_pcm *rec, int ch) 283{ 284 struct snd_emu8000 *hw = rec->emu; 285 unsigned int temp; 286 287 /* channel to be silent and idle */ 288 EMU8000_DCYSUSV_WRITE(hw, ch, 0x0080); 289 EMU8000_VTFT_WRITE(hw, ch, 0x0000FFFF); 290 EMU8000_CVCF_WRITE(hw, ch, 0x0000FFFF); 291 EMU8000_PTRX_WRITE(hw, ch, 0); 292 EMU8000_CPF_WRITE(hw, ch, 0); 293 294 /* pitch offset */ 295 EMU8000_IP_WRITE(hw, ch, rec->pitch); 296 /* set envelope parameters */ 297 EMU8000_ENVVAL_WRITE(hw, ch, 0x8000); 298 EMU8000_ATKHLD_WRITE(hw, ch, 0x7f7f); 299 EMU8000_DCYSUS_WRITE(hw, ch, 0x7f7f); 300 EMU8000_ENVVOL_WRITE(hw, ch, 0x8000); 301 EMU8000_ATKHLDV_WRITE(hw, ch, 0x7f7f); 302 /* decay/sustain parameter for volume envelope is used 303 for triggerg the voice */ 304 /* modulation envelope heights */ 305 EMU8000_PEFE_WRITE(hw, ch, 0x0); 306 /* lfo1/2 delay */ 307 EMU8000_LFO1VAL_WRITE(hw, ch, 0x8000); 308 EMU8000_LFO2VAL_WRITE(hw, ch, 0x8000); 309 /* lfo1 pitch & cutoff shift */ 310 EMU8000_FMMOD_WRITE(hw, ch, 0); 311 /* lfo1 volume & freq */ 312 EMU8000_TREMFRQ_WRITE(hw, ch, 0); 313 /* lfo2 pitch & freq */ 314 EMU8000_FM2FRQ2_WRITE(hw, ch, 0); 315 /* pan & loop start */ 316 temp = rec->panning[ch]; 317 temp = (temp <<24) | ((unsigned int)rec->loop_start[ch] - 1); 318 EMU8000_PSST_WRITE(hw, ch, temp); 319 /* chorus & loop end (chorus 8bit, MSB) */ 320 temp = 0; // chorus 321 temp = (temp << 24) | ((unsigned int)rec->loop_start[ch] + rec->buf_size - 1); 322 EMU8000_CSL_WRITE(hw, ch, temp); 323 /* Q & current address (Q 4bit value, MSB) */ 324 temp = 0; // filterQ 325 temp = (temp << 28) | ((unsigned int)rec->loop_start[ch] - 1); 326 EMU8000_CCCA_WRITE(hw, ch, temp); 327 /* clear unknown registers */ 328 EMU8000_00A0_WRITE(hw, ch, 0); 329 EMU8000_0080_WRITE(hw, ch, 0); 330} 331 332/* 333 * trigger the voice 334 */ 335static void start_voice(struct snd_emu8k_pcm *rec, int ch) 336{ 337 unsigned long flags; 338 struct snd_emu8000 *hw = rec->emu; 339 unsigned int temp, aux; 340 int pt = calc_pitch_target(rec->pitch); 341 342 /* cutoff and volume */ 343 EMU8000_IFATN_WRITE(hw, ch, 0xff00); 344 EMU8000_VTFT_WRITE(hw, ch, 0xffff); 345 EMU8000_CVCF_WRITE(hw, ch, 0xffff); 346 /* trigger envelope */ 347 EMU8000_DCYSUSV_WRITE(hw, ch, 0x7f7f); 348 /* set reverb and pitch target */ 349 temp = 0; // reverb 350 if (rec->panning[ch] == 0) 351 aux = 0xff; 352 else 353 aux = (-rec->panning[ch]) & 0xff; 354 temp = (temp << 8) | (pt << 16) | aux; 355 EMU8000_PTRX_WRITE(hw, ch, temp); 356 EMU8000_CPF_WRITE(hw, ch, pt << 16); 357 358 /* start timer */ 359 spin_lock_irqsave(&rec->timer_lock, flags); 360 if (! rec->timer_running) { 361 rec->timer.expires = jiffies + 1; 362 add_timer(&rec->timer); 363 rec->timer_running = 1; 364 } 365 spin_unlock_irqrestore(&rec->timer_lock, flags); 366} 367 368/* 369 * stop the voice immediately 370 */ 371static void stop_voice(struct snd_emu8k_pcm *rec, int ch) 372{ 373 unsigned long flags; 374 struct snd_emu8000 *hw = rec->emu; 375 376 EMU8000_DCYSUSV_WRITE(hw, ch, 0x807F); 377 378 /* stop timer */ 379 spin_lock_irqsave(&rec->timer_lock, flags); 380 if (rec->timer_running) { 381 del_timer(&rec->timer); 382 rec->timer_running = 0; 383 } 384 spin_unlock_irqrestore(&rec->timer_lock, flags); 385} 386 387static int emu8k_pcm_trigger(struct snd_pcm_substream *subs, int cmd) 388{ 389 struct snd_emu8k_pcm *rec = subs->runtime->private_data; 390 int ch; 391 392 switch (cmd) { 393 case SNDRV_PCM_TRIGGER_START: 394 for (ch = 0; ch < rec->voices; ch++) 395 start_voice(rec, ch); 396 rec->running = 1; 397 break; 398 case SNDRV_PCM_TRIGGER_STOP: 399 rec->running = 0; 400 for (ch = 0; ch < rec->voices; ch++) 401 stop_voice(rec, ch); 402 break; 403 default: 404 return -EINVAL; 405 } 406 return 0; 407} 408 409 410/* 411 * copy / silence ops 412 */ 413 414/* 415 * this macro should be inserted in the copy/silence loops 416 * to reduce the latency. without this, the system will hang up 417 * during the whole loop. 418 */ 419#define CHECK_SCHEDULER() \ 420do { \ 421 cond_resched();\ 422 if (signal_pending(current))\ 423 return -EAGAIN;\ 424} while (0) 425 426 427#ifdef USE_NONINTERLEAVE 428/* copy one channel block */ 429static int emu8k_transfer_block(struct snd_emu8000 *emu, int offset, unsigned short *buf, int count) 430{ 431 EMU8000_SMALW_WRITE(emu, offset); 432 while (count > 0) { 433 unsigned short sval; 434 CHECK_SCHEDULER(); 435 get_user(sval, buf); 436 EMU8000_SMLD_WRITE(emu, sval); 437 buf++; 438 count--; 439 } 440 return 0; 441} 442 443static int emu8k_pcm_copy(struct snd_pcm_substream *subs, 444 int voice, 445 snd_pcm_uframes_t pos, 446 void *src, 447 snd_pcm_uframes_t count) 448{ 449 struct snd_emu8k_pcm *rec = subs->runtime->private_data; 450 struct snd_emu8000 *emu = rec->emu; 451 452 snd_emu8000_write_wait(emu, 1); 453 if (voice == -1) { 454 unsigned short *buf = src; 455 int i, err; 456 count /= rec->voices; 457 for (i = 0; i < rec->voices; i++) { 458 err = emu8k_transfer_block(emu, pos + rec->loop_start[i], buf, count); 459 if (err < 0) 460 return err; 461 buf += count; 462 } 463 return 0; 464 } else { 465 return emu8k_transfer_block(emu, pos + rec->loop_start[voice], src, count); 466 } 467} 468 469/* make a channel block silence */ 470static int emu8k_silence_block(struct snd_emu8000 *emu, int offset, int count) 471{ 472 EMU8000_SMALW_WRITE(emu, offset); 473 while (count > 0) { 474 CHECK_SCHEDULER(); 475 EMU8000_SMLD_WRITE(emu, 0); 476 count--; 477 } 478 return 0; 479} 480 481static int emu8k_pcm_silence(struct snd_pcm_substream *subs, 482 int voice, 483 snd_pcm_uframes_t pos, 484 snd_pcm_uframes_t count) 485{ 486 struct snd_emu8k_pcm *rec = subs->runtime->private_data; 487 struct snd_emu8000 *emu = rec->emu; 488 489 snd_emu8000_write_wait(emu, 1); 490 if (voice == -1 && rec->voices == 1) 491 voice = 0; 492 if (voice == -1) { 493 int err; 494 err = emu8k_silence_block(emu, pos + rec->loop_start[0], count / 2); 495 if (err < 0) 496 return err; 497 return emu8k_silence_block(emu, pos + rec->loop_start[1], count / 2); 498 } else { 499 return emu8k_silence_block(emu, pos + rec->loop_start[voice], count); 500 } 501} 502 503#else /* interleave */ 504 505/* 506 * copy the interleaved data can be done easily by using 507 * DMA "left" and "right" channels on emu8k engine. 508 */ 509static int emu8k_pcm_copy(struct snd_pcm_substream *subs, 510 int voice, 511 snd_pcm_uframes_t pos, 512 void __user *src, 513 snd_pcm_uframes_t count) 514{ 515 struct snd_emu8k_pcm *rec = subs->runtime->private_data; 516 struct snd_emu8000 *emu = rec->emu; 517 unsigned short __user *buf = src; 518 519 snd_emu8000_write_wait(emu, 1); 520 EMU8000_SMALW_WRITE(emu, pos + rec->loop_start[0]); 521 if (rec->voices > 1) 522 EMU8000_SMARW_WRITE(emu, pos + rec->loop_start[1]); 523 524 while (count-- > 0) { 525 unsigned short sval; 526 CHECK_SCHEDULER(); 527 get_user(sval, buf); 528 EMU8000_SMLD_WRITE(emu, sval); 529 buf++; 530 if (rec->voices > 1) { 531 CHECK_SCHEDULER(); 532 get_user(sval, buf); 533 EMU8000_SMRD_WRITE(emu, sval); 534 buf++; 535 } 536 } 537 return 0; 538} 539 540static int emu8k_pcm_silence(struct snd_pcm_substream *subs, 541 int voice, 542 snd_pcm_uframes_t pos, 543 snd_pcm_uframes_t count) 544{ 545 struct snd_emu8k_pcm *rec = subs->runtime->private_data; 546 struct snd_emu8000 *emu = rec->emu; 547 548 snd_emu8000_write_wait(emu, 1); 549 EMU8000_SMALW_WRITE(emu, rec->loop_start[0] + pos); 550 if (rec->voices > 1) 551 EMU8000_SMARW_WRITE(emu, rec->loop_start[1] + pos); 552 while (count-- > 0) { 553 CHECK_SCHEDULER(); 554 EMU8000_SMLD_WRITE(emu, 0); 555 if (rec->voices > 1) { 556 CHECK_SCHEDULER(); 557 EMU8000_SMRD_WRITE(emu, 0); 558 } 559 } 560 return 0; 561} 562#endif 563 564 565/* 566 * allocate a memory block 567 */ 568static int emu8k_pcm_hw_params(struct snd_pcm_substream *subs, 569 struct snd_pcm_hw_params *hw_params) 570{ 571 struct snd_emu8k_pcm *rec = subs->runtime->private_data; 572 573 if (rec->block) { 574 /* reallocation - release the old block */ 575 snd_util_mem_free(rec->emu->memhdr, rec->block); 576 rec->block = NULL; 577 } 578 579 rec->allocated_bytes = params_buffer_bytes(hw_params) + LOOP_BLANK_SIZE * 4; 580 rec->block = snd_util_mem_alloc(rec->emu->memhdr, rec->allocated_bytes); 581 if (! rec->block) 582 return -ENOMEM; 583 rec->offset = EMU8000_DRAM_OFFSET + (rec->block->offset >> 1); /* in word */ 584 /* at least dma_bytes must be set for non-interleaved mode */ 585 subs->dma_buffer.bytes = params_buffer_bytes(hw_params); 586 587 return 0; 588} 589 590/* 591 * free the memory block 592 */ 593static int emu8k_pcm_hw_free(struct snd_pcm_substream *subs) 594{ 595 struct snd_emu8k_pcm *rec = subs->runtime->private_data; 596 597 if (rec->block) { 598 int ch; 599 for (ch = 0; ch < rec->voices; ch++) 600 stop_voice(rec, ch); // to be sure 601 if (rec->dram_opened) 602 emu8k_close_dram(rec->emu); 603 snd_util_mem_free(rec->emu->memhdr, rec->block); 604 rec->block = NULL; 605 } 606 return 0; 607} 608 609/* 610 */ 611static int emu8k_pcm_prepare(struct snd_pcm_substream *subs) 612{ 613 struct snd_emu8k_pcm *rec = subs->runtime->private_data; 614 615 rec->pitch = 0xe000 + calc_rate_offset(subs->runtime->rate); 616 rec->last_ptr = 0; 617 rec->period_pos = 0; 618 619 rec->buf_size = subs->runtime->buffer_size; 620 rec->period_size = subs->runtime->period_size; 621 rec->voices = subs->runtime->channels; 622 rec->loop_start[0] = rec->offset + LOOP_BLANK_SIZE; 623 if (rec->voices > 1) 624 rec->loop_start[1] = rec->loop_start[0] + rec->buf_size + LOOP_BLANK_SIZE; 625 if (rec->voices > 1) { 626 rec->panning[0] = 0xff; 627 rec->panning[1] = 0x00; 628 } else 629 rec->panning[0] = 0x80; 630 631 if (! rec->dram_opened) { 632 int err, i, ch; 633 634 snd_emux_terminate_all(rec->emu->emu); 635 if ((err = emu8k_open_dram_for_pcm(rec->emu, rec->voices)) != 0) 636 return err; 637 rec->dram_opened = 1; 638 639 /* clear loop blanks */ 640 snd_emu8000_write_wait(rec->emu, 0); 641 EMU8000_SMALW_WRITE(rec->emu, rec->offset); 642 for (i = 0; i < LOOP_BLANK_SIZE; i++) 643 EMU8000_SMLD_WRITE(rec->emu, 0); 644 for (ch = 0; ch < rec->voices; ch++) { 645 EMU8000_SMALW_WRITE(rec->emu, rec->loop_start[ch] + rec->buf_size); 646 for (i = 0; i < LOOP_BLANK_SIZE; i++) 647 EMU8000_SMLD_WRITE(rec->emu, 0); 648 } 649 } 650 651 setup_voice(rec, 0); 652 if (rec->voices > 1) 653 setup_voice(rec, 1); 654 return 0; 655} 656 657static snd_pcm_uframes_t emu8k_pcm_pointer(struct snd_pcm_substream *subs) 658{ 659 struct snd_emu8k_pcm *rec = subs->runtime->private_data; 660 if (rec->running) 661 return emu8k_get_curpos(rec, 0); 662 return 0; 663} 664 665 666static struct snd_pcm_ops emu8k_pcm_ops = { 667 .open = emu8k_pcm_open, 668 .close = emu8k_pcm_close, 669 .ioctl = snd_pcm_lib_ioctl, 670 .hw_params = emu8k_pcm_hw_params, 671 .hw_free = emu8k_pcm_hw_free, 672 .prepare = emu8k_pcm_prepare, 673 .trigger = emu8k_pcm_trigger, 674 .pointer = emu8k_pcm_pointer, 675 .copy = emu8k_pcm_copy, 676 .silence = emu8k_pcm_silence, 677}; 678 679 680static void snd_emu8000_pcm_free(struct snd_pcm *pcm) 681{ 682 struct snd_emu8000 *emu = pcm->private_data; 683 emu->pcm = NULL; 684} 685 686int snd_emu8000_pcm_new(struct snd_card *card, struct snd_emu8000 *emu, int index) 687{ 688 struct snd_pcm *pcm; 689 int err; 690 691 if ((err = snd_pcm_new(card, "Emu8000 PCM", index, 1, 0, &pcm)) < 0) 692 return err; 693 pcm->private_data = emu; 694 pcm->private_free = snd_emu8000_pcm_free; 695 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &emu8k_pcm_ops); 696 emu->pcm = pcm; 697 698 snd_device_register(card, pcm); 699 700 return 0; 701} 702