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 23 #include <linux/sched/signal.h> 24 #include <linux/init.h> 25 #include <linux/slab.h> 26 #include <sound/initval.h> 27 #include <sound/pcm.h> 28 29 /* 30 * define the following if you want to use this pcm with non-interleaved mode 31 */ 32 /* #define USE_NONINTERLEAVE */ 33 34 /* NOTE: for using the non-interleaved mode with alsa-lib, you have to set 35 * mmap_emulation flag to 1 in your .asoundrc, such like 36 * 37 * pcm.emu8k { 38 * type plug 39 * slave.pcm { 40 * type hw 41 * card 0 42 * device 1 43 * mmap_emulation 1 44 * } 45 * } 46 * 47 * besides, for the time being, the non-interleaved mode doesn't work well on 48 * alsa-lib... 49 */ 50 51 52 struct snd_emu8k_pcm { 53 struct snd_emu8000 *emu; 54 struct snd_pcm_substream *substream; 55 56 unsigned int allocated_bytes; 57 struct snd_util_memblk *block; 58 unsigned int offset; 59 unsigned int buf_size; 60 unsigned int period_size; 61 unsigned int loop_start[2]; 62 unsigned int pitch; 63 int panning[2]; 64 int last_ptr; 65 int period_pos; 66 int voices; 67 unsigned int dram_opened: 1; 68 unsigned int running: 1; 69 unsigned int timer_running: 1; 70 struct timer_list timer; 71 spinlock_t timer_lock; 72 }; 73 74 #define LOOP_BLANK_SIZE 8 75 76 77 /* 78 * open up channels for the simultaneous data transfer and playback 79 */ 80 static int 81 emu8k_open_dram_for_pcm(struct snd_emu8000 *emu, int channels) 82 { 83 int i; 84 85 /* reserve up to 2 voices for playback */ 86 snd_emux_lock_voice(emu->emu, 0); 87 if (channels > 1) 88 snd_emux_lock_voice(emu->emu, 1); 89 90 /* reserve 28 voices for loading */ 91 for (i = channels + 1; i < EMU8000_DRAM_VOICES; i++) { 92 unsigned int mode = EMU8000_RAM_WRITE; 93 snd_emux_lock_voice(emu->emu, i); 94 #ifndef USE_NONINTERLEAVE 95 if (channels > 1 && (i & 1) != 0) 96 mode |= EMU8000_RAM_RIGHT; 97 #endif 98 snd_emu8000_dma_chan(emu, i, mode); 99 } 100 101 /* assign voice 31 and 32 to ROM */ 102 EMU8000_VTFT_WRITE(emu, 30, 0); 103 EMU8000_PSST_WRITE(emu, 30, 0x1d8); 104 EMU8000_CSL_WRITE(emu, 30, 0x1e0); 105 EMU8000_CCCA_WRITE(emu, 30, 0x1d8); 106 EMU8000_VTFT_WRITE(emu, 31, 0); 107 EMU8000_PSST_WRITE(emu, 31, 0x1d8); 108 EMU8000_CSL_WRITE(emu, 31, 0x1e0); 109 EMU8000_CCCA_WRITE(emu, 31, 0x1d8); 110 111 return 0; 112 } 113 114 /* 115 */ 116 static void 117 snd_emu8000_write_wait(struct snd_emu8000 *emu, int can_schedule) 118 { 119 while ((EMU8000_SMALW_READ(emu) & 0x80000000) != 0) { 120 if (can_schedule) { 121 schedule_timeout_interruptible(1); 122 if (signal_pending(current)) 123 break; 124 } 125 } 126 } 127 128 /* 129 * close all channels 130 */ 131 static void 132 emu8k_close_dram(struct snd_emu8000 *emu) 133 { 134 int i; 135 136 for (i = 0; i < 2; i++) 137 snd_emux_unlock_voice(emu->emu, i); 138 for (; i < EMU8000_DRAM_VOICES; i++) { 139 snd_emu8000_dma_chan(emu, i, EMU8000_RAM_CLOSE); 140 snd_emux_unlock_voice(emu->emu, i); 141 } 142 } 143 144 /* 145 * convert Hz to AWE32 rate offset (see emux/soundfont.c) 146 */ 147 148 #define OFFSET_SAMPLERATE 1011119 /* base = 44100 */ 149 #define SAMPLERATE_RATIO 4096 150 151 static int calc_rate_offset(int hz) 152 { 153 return snd_sf_linear_to_log(hz, OFFSET_SAMPLERATE, SAMPLERATE_RATIO); 154 } 155 156 157 /* 158 */ 159 160 static struct snd_pcm_hardware emu8k_pcm_hw = { 161 #ifdef USE_NONINTERLEAVE 162 .info = SNDRV_PCM_INFO_NONINTERLEAVED, 163 #else 164 .info = SNDRV_PCM_INFO_INTERLEAVED, 165 #endif 166 .formats = SNDRV_PCM_FMTBIT_S16_LE, 167 .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000, 168 .rate_min = 4000, 169 .rate_max = 48000, 170 .channels_min = 1, 171 .channels_max = 2, 172 .buffer_bytes_max = (128*1024), 173 .period_bytes_min = 1024, 174 .period_bytes_max = (128*1024), 175 .periods_min = 2, 176 .periods_max = 1024, 177 .fifo_size = 0, 178 179 }; 180 181 /* 182 * get the current position at the given channel from CCCA register 183 */ 184 static inline int emu8k_get_curpos(struct snd_emu8k_pcm *rec, int ch) 185 { 186 int val = EMU8000_CCCA_READ(rec->emu, ch) & 0xfffffff; 187 val -= rec->loop_start[ch] - 1; 188 return val; 189 } 190 191 192 /* 193 * timer interrupt handler 194 * check the current position and update the period if necessary. 195 */ 196 static void emu8k_pcm_timer_func(unsigned long data) 197 { 198 struct snd_emu8k_pcm *rec = (struct snd_emu8k_pcm *)data; 199 int ptr, delta; 200 201 spin_lock(&rec->timer_lock); 202 /* update the current pointer */ 203 ptr = emu8k_get_curpos(rec, 0); 204 if (ptr < rec->last_ptr) 205 delta = ptr + rec->buf_size - rec->last_ptr; 206 else 207 delta = ptr - rec->last_ptr; 208 rec->period_pos += delta; 209 rec->last_ptr = ptr; 210 211 /* reprogram timer */ 212 mod_timer(&rec->timer, jiffies + 1); 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(struct snd_pcm_substream *subs) 230 { 231 struct snd_emu8000 *emu = snd_pcm_substream_chip(subs); 232 struct snd_emu8k_pcm *rec; 233 struct snd_pcm_runtime *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 setup_timer(&rec->timer, emu8k_pcm_timer_func, (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 } 256 257 static 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 */ 268 static 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 */ 282 static 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 */ 335 static 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 mod_timer(&rec->timer, jiffies + 1); 362 rec->timer_running = 1; 363 } 364 spin_unlock_irqrestore(&rec->timer_lock, flags); 365 } 366 367 /* 368 * stop the voice immediately 369 */ 370 static void stop_voice(struct snd_emu8k_pcm *rec, int ch) 371 { 372 unsigned long flags; 373 struct snd_emu8000 *hw = rec->emu; 374 375 EMU8000_DCYSUSV_WRITE(hw, ch, 0x807F); 376 377 /* stop timer */ 378 spin_lock_irqsave(&rec->timer_lock, flags); 379 if (rec->timer_running) { 380 del_timer(&rec->timer); 381 rec->timer_running = 0; 382 } 383 spin_unlock_irqrestore(&rec->timer_lock, flags); 384 } 385 386 static int emu8k_pcm_trigger(struct snd_pcm_substream *subs, int cmd) 387 { 388 struct snd_emu8k_pcm *rec = subs->runtime->private_data; 389 int ch; 390 391 switch (cmd) { 392 case SNDRV_PCM_TRIGGER_START: 393 for (ch = 0; ch < rec->voices; ch++) 394 start_voice(rec, ch); 395 rec->running = 1; 396 break; 397 case SNDRV_PCM_TRIGGER_STOP: 398 rec->running = 0; 399 for (ch = 0; ch < rec->voices; ch++) 400 stop_voice(rec, ch); 401 break; 402 default: 403 return -EINVAL; 404 } 405 return 0; 406 } 407 408 409 /* 410 * copy / silence ops 411 */ 412 413 /* 414 * this macro should be inserted in the copy/silence loops 415 * to reduce the latency. without this, the system will hang up 416 * during the whole loop. 417 */ 418 #define CHECK_SCHEDULER() \ 419 do { \ 420 cond_resched();\ 421 if (signal_pending(current))\ 422 return -EAGAIN;\ 423 } while (0) 424 425 426 #ifdef USE_NONINTERLEAVE 427 /* copy one channel block */ 428 static int emu8k_transfer_block(struct snd_emu8000 *emu, int offset, unsigned short *buf, int count) 429 { 430 EMU8000_SMALW_WRITE(emu, offset); 431 while (count > 0) { 432 unsigned short sval; 433 CHECK_SCHEDULER(); 434 if (get_user(sval, buf)) 435 return -EFAULT; 436 EMU8000_SMLD_WRITE(emu, sval); 437 buf++; 438 count--; 439 } 440 return 0; 441 } 442 443 static 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 */ 470 static 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 } 480 481 static 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 */ 509 static 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 if (get_user(sval, buf)) 528 return -EFAULT; 529 EMU8000_SMLD_WRITE(emu, sval); 530 buf++; 531 if (rec->voices > 1) { 532 CHECK_SCHEDULER(); 533 if (get_user(sval, buf)) 534 return -EFAULT; 535 EMU8000_SMRD_WRITE(emu, sval); 536 buf++; 537 } 538 } 539 return 0; 540 } 541 542 static int emu8k_pcm_silence(struct snd_pcm_substream *subs, 543 int voice, 544 snd_pcm_uframes_t pos, 545 snd_pcm_uframes_t count) 546 { 547 struct snd_emu8k_pcm *rec = subs->runtime->private_data; 548 struct snd_emu8000 *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(struct snd_pcm_substream *subs, 571 struct snd_pcm_hw_params *hw_params) 572 { 573 struct snd_emu8k_pcm *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(struct snd_pcm_substream *subs) 596 { 597 struct snd_emu8k_pcm *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(struct snd_pcm_substream *subs) 614 { 615 struct snd_emu8k_pcm *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(struct snd_pcm_substream *subs) 660 { 661 struct snd_emu8k_pcm *rec = subs->runtime->private_data; 662 if (rec->running) 663 return emu8k_get_curpos(rec, 0); 664 return 0; 665 } 666 667 668 static struct snd_pcm_ops 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(struct snd_pcm *pcm) 683 { 684 struct snd_emu8000 *emu = pcm->private_data; 685 emu->pcm = NULL; 686 } 687 688 int snd_emu8000_pcm_new(struct snd_card *card, struct snd_emu8000 *emu, int index) 689 { 690 struct snd_pcm *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