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 <linux/slab.h> 24#include <sound/initval.h> 25#include <sound/pcm.h> 26 27/* 28 * define the following if you want to use this pcm with non-interleaved mode 29 */ 30/* #define USE_NONINTERLEAVE */ 31 32/* NOTE: for using the non-interleaved mode with alsa-lib, you have to set 33 * mmap_emulation flag to 1 in your .asoundrc, such like 34 * 35 * pcm.emu8k { 36 * type plug 37 * slave.pcm { 38 * type hw 39 * card 0 40 * device 1 41 * mmap_emulation 1 42 * } 43 * } 44 * 45 * besides, for the time being, the non-interleaved mode doesn't work well on 46 * alsa-lib... 47 */ 48 49 50struct snd_emu8k_pcm { 51 struct snd_emu8000 *emu; 52 struct snd_pcm_substream *substream; 53 54 unsigned int allocated_bytes; 55 struct snd_util_memblk *block; 56 unsigned int offset; 57 unsigned int buf_size; 58 unsigned int period_size; 59 unsigned int loop_start[2]; 60 unsigned int pitch; 61 int panning[2]; 62 int last_ptr; 63 int period_pos; 64 int voices; 65 unsigned int dram_opened: 1; 66 unsigned int running: 1; 67 unsigned int timer_running: 1; 68 struct timer_list timer; 69 spinlock_t timer_lock; 70}; 71 72#define LOOP_BLANK_SIZE 8 73 74 75/* 76 * open up channels for the simultaneous data transfer and playback 77 */ 78static int 79emu8k_open_dram_for_pcm(struct snd_emu8000 *emu, int channels) 80{ 81 int i; 82 83 /* reserve up to 2 voices for playback */ 84 snd_emux_lock_voice(emu->emu, 0); 85 if (channels > 1) 86 snd_emux_lock_voice(emu->emu, 1); 87 88 /* reserve 28 voices for loading */ 89 for (i = channels + 1; i < EMU8000_DRAM_VOICES; i++) { 90 unsigned int mode = EMU8000_RAM_WRITE; 91 snd_emux_lock_voice(emu->emu, i); 92#ifndef USE_NONINTERLEAVE 93 if (channels > 1 && (i & 1) != 0) 94 mode |= EMU8000_RAM_RIGHT; 95#endif 96 snd_emu8000_dma_chan(emu, i, mode); 97 } 98 99 /* assign voice 31 and 32 to ROM */ 100 EMU8000_VTFT_WRITE(emu, 30, 0); 101 EMU8000_PSST_WRITE(emu, 30, 0x1d8); 102 EMU8000_CSL_WRITE(emu, 30, 0x1e0); 103 EMU8000_CCCA_WRITE(emu, 30, 0x1d8); 104 EMU8000_VTFT_WRITE(emu, 31, 0); 105 EMU8000_PSST_WRITE(emu, 31, 0x1d8); 106 EMU8000_CSL_WRITE(emu, 31, 0x1e0); 107 EMU8000_CCCA_WRITE(emu, 31, 0x1d8); 108 109 return 0; 110} 111 112/* 113 */ 114static void 115snd_emu8000_write_wait(struct snd_emu8000 *emu, int can_schedule) 116{ 117 while ((EMU8000_SMALW_READ(emu) & 0x80000000) != 0) { 118 if (can_schedule) { 119 schedule_timeout_interruptible(1); 120 if (signal_pending(current)) 121 break; 122 } 123 } 124} 125 126/* 127 * close all channels 128 */ 129static void 130emu8k_close_dram(struct snd_emu8000 *emu) 131{ 132 int i; 133 134 for (i = 0; i < 2; i++) 135 snd_emux_unlock_voice(emu->emu, i); 136 for (; i < EMU8000_DRAM_VOICES; i++) { 137 snd_emu8000_dma_chan(emu, i, EMU8000_RAM_CLOSE); 138 snd_emux_unlock_voice(emu->emu, i); 139 } 140} 141 142/* 143 * convert Hz to AWE32 rate offset (see emux/soundfont.c) 144 */ 145 146#define OFFSET_SAMPLERATE 1011119 /* base = 44100 */ 147#define SAMPLERATE_RATIO 4096 148 149static int calc_rate_offset(int hz) 150{ 151 return snd_sf_linear_to_log(hz, OFFSET_SAMPLERATE, SAMPLERATE_RATIO); 152} 153 154 155/* 156 */ 157 158static struct snd_pcm_hardware emu8k_pcm_hw = { 159#ifdef USE_NONINTERLEAVE 160 .info = SNDRV_PCM_INFO_NONINTERLEAVED, 161#else 162 .info = SNDRV_PCM_INFO_INTERLEAVED, 163#endif 164 .formats = SNDRV_PCM_FMTBIT_S16_LE, 165 .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000, 166 .rate_min = 4000, 167 .rate_max = 48000, 168 .channels_min = 1, 169 .channels_max = 2, 170 .buffer_bytes_max = (128*1024), 171 .period_bytes_min = 1024, 172 .period_bytes_max = (128*1024), 173 .periods_min = 2, 174 .periods_max = 1024, 175 .fifo_size = 0, 176 177}; 178 179/* 180 * get the current position at the given channel from CCCA register 181 */ 182static inline int emu8k_get_curpos(struct snd_emu8k_pcm *rec, int ch) 183{ 184 int val = EMU8000_CCCA_READ(rec->emu, ch) & 0xfffffff; 185 val -= rec->loop_start[ch] - 1; 186 return val; 187} 188 189 190/* 191 * timer interrupt handler 192 * check the current position and update the period if necessary. 193 */ 194static void emu8k_pcm_timer_func(unsigned long data) 195{ 196 struct snd_emu8k_pcm *rec = (struct snd_emu8k_pcm *)data; 197 int ptr, delta; 198 199 spin_lock(&rec->timer_lock); 200 /* update the current pointer */ 201 ptr = emu8k_get_curpos(rec, 0); 202 if (ptr < rec->last_ptr) 203 delta = ptr + rec->buf_size - rec->last_ptr; 204 else 205 delta = ptr - rec->last_ptr; 206 rec->period_pos += delta; 207 rec->last_ptr = ptr; 208 209 /* reprogram timer */ 210 rec->timer.expires = jiffies + 1; 211 add_timer(&rec->timer); 212 213 /* update period */ 214 if (rec->period_pos >= (int)rec->period_size) { 215 rec->period_pos %= rec->period_size; 216 spin_unlock(&rec->timer_lock); 217 snd_pcm_period_elapsed(rec->substream); 218 return; 219 } 220 spin_unlock(&rec->timer_lock); 221} 222 223 224/* 225 * open pcm 226 * creating an instance here 227 */ 228static int emu8k_pcm_open(struct snd_pcm_substream *subs) 229{ 230 struct snd_emu8000 *emu = snd_pcm_substream_chip(subs); 231 struct snd_emu8k_pcm *rec; 232 struct snd_pcm_runtime *runtime = subs->runtime; 233 234 rec = kzalloc(sizeof(*rec), GFP_KERNEL); 235 if (! rec) 236 return -ENOMEM; 237 238 rec->emu = emu; 239 rec->substream = subs; 240 runtime->private_data = rec; 241 242 spin_lock_init(&rec->timer_lock); 243 init_timer(&rec->timer); 244 rec->timer.function = emu8k_pcm_timer_func; 245 rec->timer.data = (unsigned long)rec; 246 247 runtime->hw = emu8k_pcm_hw; 248 runtime->hw.buffer_bytes_max = emu->mem_size - LOOP_BLANK_SIZE * 3; 249 runtime->hw.period_bytes_max = runtime->hw.buffer_bytes_max / 2; 250 251 /* use timer to update periods.. (specified in msec) */ 252 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 253 (1000000 + HZ - 1) / HZ, UINT_MAX); 254 255 return 0; 256} 257 258static int emu8k_pcm_close(struct snd_pcm_substream *subs) 259{ 260 struct snd_emu8k_pcm *rec = subs->runtime->private_data; 261 kfree(rec); 262 subs->runtime->private_data = NULL; 263 return 0; 264} 265 266/* 267 * calculate pitch target 268 */ 269static int calc_pitch_target(int pitch) 270{ 271 int ptarget = 1 << (pitch >> 12); 272 if (pitch & 0x800) ptarget += (ptarget * 0x102e) / 0x2710; 273 if (pitch & 0x400) ptarget += (ptarget * 0x764) / 0x2710; 274 if (pitch & 0x200) ptarget += (ptarget * 0x389) / 0x2710; 275 ptarget += (ptarget >> 1); 276 if (ptarget > 0xffff) ptarget = 0xffff; 277 return ptarget; 278} 279 280/* 281 * set up the voice 282 */ 283static void setup_voice(struct snd_emu8k_pcm *rec, int ch) 284{ 285 struct snd_emu8000 *hw = rec->emu; 286 unsigned int temp; 287 288 /* channel to be silent and idle */ 289 EMU8000_DCYSUSV_WRITE(hw, ch, 0x0080); 290 EMU8000_VTFT_WRITE(hw, ch, 0x0000FFFF); 291 EMU8000_CVCF_WRITE(hw, ch, 0x0000FFFF); 292 EMU8000_PTRX_WRITE(hw, ch, 0); 293 EMU8000_CPF_WRITE(hw, ch, 0); 294 295 /* pitch offset */ 296 EMU8000_IP_WRITE(hw, ch, rec->pitch); 297 /* set envelope parameters */ 298 EMU8000_ENVVAL_WRITE(hw, ch, 0x8000); 299 EMU8000_ATKHLD_WRITE(hw, ch, 0x7f7f); 300 EMU8000_DCYSUS_WRITE(hw, ch, 0x7f7f); 301 EMU8000_ENVVOL_WRITE(hw, ch, 0x8000); 302 EMU8000_ATKHLDV_WRITE(hw, ch, 0x7f7f); 303 /* decay/sustain parameter for volume envelope is used 304 for triggerg the voice */ 305 /* modulation envelope heights */ 306 EMU8000_PEFE_WRITE(hw, ch, 0x0); 307 /* lfo1/2 delay */ 308 EMU8000_LFO1VAL_WRITE(hw, ch, 0x8000); 309 EMU8000_LFO2VAL_WRITE(hw, ch, 0x8000); 310 /* lfo1 pitch & cutoff shift */ 311 EMU8000_FMMOD_WRITE(hw, ch, 0); 312 /* lfo1 volume & freq */ 313 EMU8000_TREMFRQ_WRITE(hw, ch, 0); 314 /* lfo2 pitch & freq */ 315 EMU8000_FM2FRQ2_WRITE(hw, ch, 0); 316 /* pan & loop start */ 317 temp = rec->panning[ch]; 318 temp = (temp <<24) | ((unsigned int)rec->loop_start[ch] - 1); 319 EMU8000_PSST_WRITE(hw, ch, temp); 320 /* chorus & loop end (chorus 8bit, MSB) */ 321 temp = 0; // chorus 322 temp = (temp << 24) | ((unsigned int)rec->loop_start[ch] + rec->buf_size - 1); 323 EMU8000_CSL_WRITE(hw, ch, temp); 324 /* Q & current address (Q 4bit value, MSB) */ 325 temp = 0; // filterQ 326 temp = (temp << 28) | ((unsigned int)rec->loop_start[ch] - 1); 327 EMU8000_CCCA_WRITE(hw, ch, temp); 328 /* clear unknown registers */ 329 EMU8000_00A0_WRITE(hw, ch, 0); 330 EMU8000_0080_WRITE(hw, ch, 0); 331} 332 333/* 334 * trigger the voice 335 */ 336static void start_voice(struct snd_emu8k_pcm *rec, int ch) 337{ 338 unsigned long flags; 339 struct snd_emu8000 *hw = rec->emu; 340 unsigned int temp, aux; 341 int pt = calc_pitch_target(rec->pitch); 342 343 /* cutoff and volume */ 344 EMU8000_IFATN_WRITE(hw, ch, 0xff00); 345 EMU8000_VTFT_WRITE(hw, ch, 0xffff); 346 EMU8000_CVCF_WRITE(hw, ch, 0xffff); 347 /* trigger envelope */ 348 EMU8000_DCYSUSV_WRITE(hw, ch, 0x7f7f); 349 /* set reverb and pitch target */ 350 temp = 0; // reverb 351 if (rec->panning[ch] == 0) 352 aux = 0xff; 353 else 354 aux = (-rec->panning[ch]) & 0xff; 355 temp = (temp << 8) | (pt << 16) | aux; 356 EMU8000_PTRX_WRITE(hw, ch, temp); 357 EMU8000_CPF_WRITE(hw, ch, pt << 16); 358 359 /* start timer */ 360 spin_lock_irqsave(&rec->timer_lock, flags); 361 if (! rec->timer_running) { 362 rec->timer.expires = jiffies + 1; 363 add_timer(&rec->timer); 364 rec->timer_running = 1; 365 } 366 spin_unlock_irqrestore(&rec->timer_lock, flags); 367} 368 369/* 370 * stop the voice immediately 371 */ 372static void stop_voice(struct snd_emu8k_pcm *rec, int ch) 373{ 374 unsigned long flags; 375 struct snd_emu8000 *hw = rec->emu; 376 377 EMU8000_DCYSUSV_WRITE(hw, ch, 0x807F); 378 379 /* stop timer */ 380 spin_lock_irqsave(&rec->timer_lock, flags); 381 if (rec->timer_running) { 382 del_timer(&rec->timer); 383 rec->timer_running = 0; 384 } 385 spin_unlock_irqrestore(&rec->timer_lock, flags); 386} 387 388static int emu8k_pcm_trigger(struct snd_pcm_substream *subs, int cmd) 389{ 390 struct snd_emu8k_pcm *rec = subs->runtime->private_data; 391 int ch; 392 393 switch (cmd) { 394 case SNDRV_PCM_TRIGGER_START: 395 for (ch = 0; ch < rec->voices; ch++) 396 start_voice(rec, ch); 397 rec->running = 1; 398 break; 399 case SNDRV_PCM_TRIGGER_STOP: 400 rec->running = 0; 401 for (ch = 0; ch < rec->voices; ch++) 402 stop_voice(rec, ch); 403 break; 404 default: 405 return -EINVAL; 406 } 407 return 0; 408} 409 410 411/* 412 * copy / silence ops 413 */ 414 415/* 416 * this macro should be inserted in the copy/silence loops 417 * to reduce the latency. without this, the system will hang up 418 * during the whole loop. 419 */ 420#define CHECK_SCHEDULER() \ 421do { \ 422 cond_resched();\ 423 if (signal_pending(current))\ 424 return -EAGAIN;\ 425} while (0) 426 427 428#ifdef USE_NONINTERLEAVE 429/* copy one channel block */ 430static int emu8k_transfer_block(struct snd_emu8000 *emu, int offset, unsigned short *buf, int count) 431{ 432 EMU8000_SMALW_WRITE(emu, offset); 433 while (count > 0) { 434 unsigned short sval; 435 CHECK_SCHEDULER(); 436 if (get_user(sval, buf)) 437 return -EFAULT; 438 EMU8000_SMLD_WRITE(emu, sval); 439 buf++; 440 count--; 441 } 442 return 0; 443} 444 445static int emu8k_pcm_copy(struct snd_pcm_substream *subs, 446 int voice, 447 snd_pcm_uframes_t pos, 448 void *src, 449 snd_pcm_uframes_t count) 450{ 451 struct snd_emu8k_pcm *rec = subs->runtime->private_data; 452 struct snd_emu8000 *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 */ 472static int emu8k_silence_block(struct snd_emu8000 *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 483static int emu8k_pcm_silence(struct snd_pcm_substream *subs, 484 int voice, 485 snd_pcm_uframes_t pos, 486 snd_pcm_uframes_t count) 487{ 488 struct snd_emu8k_pcm *rec = subs->runtime->private_data; 489 struct snd_emu8000 *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 */ 511static int emu8k_pcm_copy(struct snd_pcm_substream *subs, 512 int voice, 513 snd_pcm_uframes_t pos, 514 void __user *src, 515 snd_pcm_uframes_t count) 516{ 517 struct snd_emu8k_pcm *rec = subs->runtime->private_data; 518 struct snd_emu8000 *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 if (get_user(sval, buf)) 530 return -EFAULT; 531 EMU8000_SMLD_WRITE(emu, sval); 532 buf++; 533 if (rec->voices > 1) { 534 CHECK_SCHEDULER(); 535 if (get_user(sval, buf)) 536 return -EFAULT; 537 EMU8000_SMRD_WRITE(emu, sval); 538 buf++; 539 } 540 } 541 return 0; 542} 543 544static int emu8k_pcm_silence(struct snd_pcm_substream *subs, 545 int voice, 546 snd_pcm_uframes_t pos, 547 snd_pcm_uframes_t count) 548{ 549 struct snd_emu8k_pcm *rec = subs->runtime->private_data; 550 struct snd_emu8000 *emu = rec->emu; 551 552 snd_emu8000_write_wait(emu, 1); 553 EMU8000_SMALW_WRITE(emu, rec->loop_start[0] + pos); 554 if (rec->voices > 1) 555 EMU8000_SMARW_WRITE(emu, rec->loop_start[1] + pos); 556 while (count-- > 0) { 557 CHECK_SCHEDULER(); 558 EMU8000_SMLD_WRITE(emu, 0); 559 if (rec->voices > 1) { 560 CHECK_SCHEDULER(); 561 EMU8000_SMRD_WRITE(emu, 0); 562 } 563 } 564 return 0; 565} 566#endif 567 568 569/* 570 * allocate a memory block 571 */ 572static int emu8k_pcm_hw_params(struct snd_pcm_substream *subs, 573 struct snd_pcm_hw_params *hw_params) 574{ 575 struct snd_emu8k_pcm *rec = subs->runtime->private_data; 576 577 if (rec->block) { 578 /* reallocation - release the old block */ 579 snd_util_mem_free(rec->emu->memhdr, rec->block); 580 rec->block = NULL; 581 } 582 583 rec->allocated_bytes = params_buffer_bytes(hw_params) + LOOP_BLANK_SIZE * 4; 584 rec->block = snd_util_mem_alloc(rec->emu->memhdr, rec->allocated_bytes); 585 if (! rec->block) 586 return -ENOMEM; 587 rec->offset = EMU8000_DRAM_OFFSET + (rec->block->offset >> 1); /* in word */ 588 /* at least dma_bytes must be set for non-interleaved mode */ 589 subs->dma_buffer.bytes = params_buffer_bytes(hw_params); 590 591 return 0; 592} 593 594/* 595 * free the memory block 596 */ 597static int emu8k_pcm_hw_free(struct snd_pcm_substream *subs) 598{ 599 struct snd_emu8k_pcm *rec = subs->runtime->private_data; 600 601 if (rec->block) { 602 int ch; 603 for (ch = 0; ch < rec->voices; ch++) 604 stop_voice(rec, ch); // to be sure 605 if (rec->dram_opened) 606 emu8k_close_dram(rec->emu); 607 snd_util_mem_free(rec->emu->memhdr, rec->block); 608 rec->block = NULL; 609 } 610 return 0; 611} 612 613/* 614 */ 615static int emu8k_pcm_prepare(struct snd_pcm_substream *subs) 616{ 617 struct snd_emu8k_pcm *rec = subs->runtime->private_data; 618 619 rec->pitch = 0xe000 + calc_rate_offset(subs->runtime->rate); 620 rec->last_ptr = 0; 621 rec->period_pos = 0; 622 623 rec->buf_size = subs->runtime->buffer_size; 624 rec->period_size = subs->runtime->period_size; 625 rec->voices = subs->runtime->channels; 626 rec->loop_start[0] = rec->offset + LOOP_BLANK_SIZE; 627 if (rec->voices > 1) 628 rec->loop_start[1] = rec->loop_start[0] + rec->buf_size + LOOP_BLANK_SIZE; 629 if (rec->voices > 1) { 630 rec->panning[0] = 0xff; 631 rec->panning[1] = 0x00; 632 } else 633 rec->panning[0] = 0x80; 634 635 if (! rec->dram_opened) { 636 int err, i, ch; 637 638 snd_emux_terminate_all(rec->emu->emu); 639 if ((err = emu8k_open_dram_for_pcm(rec->emu, rec->voices)) != 0) 640 return err; 641 rec->dram_opened = 1; 642 643 /* clear loop blanks */ 644 snd_emu8000_write_wait(rec->emu, 0); 645 EMU8000_SMALW_WRITE(rec->emu, rec->offset); 646 for (i = 0; i < LOOP_BLANK_SIZE; i++) 647 EMU8000_SMLD_WRITE(rec->emu, 0); 648 for (ch = 0; ch < rec->voices; ch++) { 649 EMU8000_SMALW_WRITE(rec->emu, rec->loop_start[ch] + rec->buf_size); 650 for (i = 0; i < LOOP_BLANK_SIZE; i++) 651 EMU8000_SMLD_WRITE(rec->emu, 0); 652 } 653 } 654 655 setup_voice(rec, 0); 656 if (rec->voices > 1) 657 setup_voice(rec, 1); 658 return 0; 659} 660 661static snd_pcm_uframes_t emu8k_pcm_pointer(struct snd_pcm_substream *subs) 662{ 663 struct snd_emu8k_pcm *rec = subs->runtime->private_data; 664 if (rec->running) 665 return emu8k_get_curpos(rec, 0); 666 return 0; 667} 668 669 670static struct snd_pcm_ops emu8k_pcm_ops = { 671 .open = emu8k_pcm_open, 672 .close = emu8k_pcm_close, 673 .ioctl = snd_pcm_lib_ioctl, 674 .hw_params = emu8k_pcm_hw_params, 675 .hw_free = emu8k_pcm_hw_free, 676 .prepare = emu8k_pcm_prepare, 677 .trigger = emu8k_pcm_trigger, 678 .pointer = emu8k_pcm_pointer, 679 .copy = emu8k_pcm_copy, 680 .silence = emu8k_pcm_silence, 681}; 682 683 684static void snd_emu8000_pcm_free(struct snd_pcm *pcm) 685{ 686 struct snd_emu8000 *emu = pcm->private_data; 687 emu->pcm = NULL; 688} 689 690int snd_emu8000_pcm_new(struct snd_card *card, struct snd_emu8000 *emu, int index) 691{ 692 struct snd_pcm *pcm; 693 int err; 694 695 if ((err = snd_pcm_new(card, "Emu8000 PCM", index, 1, 0, &pcm)) < 0) 696 return err; 697 pcm->private_data = emu; 698 pcm->private_free = snd_emu8000_pcm_free; 699 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &emu8k_pcm_ops); 700 emu->pcm = pcm; 701 702 snd_device_register(card, pcm); 703 704 return 0; 705} 706