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 50 struct 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 */ 78 static int 79 emu8k_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 */ 114 static void 115 snd_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 */ 129 static void 130 emu8k_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 148 149 static int calc_rate_offset(int hz) 150 { 151 return snd_sf_linear_to_log(hz, OFFSET_SAMPLERATE, SAMPLERATE_RATIO); 152 } 153 154 155 /* 156 */ 157 158 static 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 */ 182 static 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 */ 194 static 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 mod_timer(&rec->timer, jiffies + 1); 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 */ 227 static 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 setup_timer(&rec->timer, emu8k_pcm_timer_func, (unsigned long)rec); 243 244 runtime->hw = emu8k_pcm_hw; 245 runtime->hw.buffer_bytes_max = emu->mem_size - LOOP_BLANK_SIZE * 3; 246 runtime->hw.period_bytes_max = runtime->hw.buffer_bytes_max / 2; 247 248 /* use timer to update periods.. (specified in msec) */ 249 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 250 (1000000 + HZ - 1) / HZ, UINT_MAX); 251 252 return 0; 253 } 254 255 static int emu8k_pcm_close(struct snd_pcm_substream *subs) 256 { 257 struct snd_emu8k_pcm *rec = subs->runtime->private_data; 258 kfree(rec); 259 subs->runtime->private_data = NULL; 260 return 0; 261 } 262 263 /* 264 * calculate pitch target 265 */ 266 static int calc_pitch_target(int pitch) 267 { 268 int ptarget = 1 << (pitch >> 12); 269 if (pitch & 0x800) ptarget += (ptarget * 0x102e) / 0x2710; 270 if (pitch & 0x400) ptarget += (ptarget * 0x764) / 0x2710; 271 if (pitch & 0x200) ptarget += (ptarget * 0x389) / 0x2710; 272 ptarget += (ptarget >> 1); 273 if (ptarget > 0xffff) ptarget = 0xffff; 274 return ptarget; 275 } 276 277 /* 278 * set up the voice 279 */ 280 static void setup_voice(struct snd_emu8k_pcm *rec, int ch) 281 { 282 struct snd_emu8000 *hw = rec->emu; 283 unsigned int temp; 284 285 /* channel to be silent and idle */ 286 EMU8000_DCYSUSV_WRITE(hw, ch, 0x0080); 287 EMU8000_VTFT_WRITE(hw, ch, 0x0000FFFF); 288 EMU8000_CVCF_WRITE(hw, ch, 0x0000FFFF); 289 EMU8000_PTRX_WRITE(hw, ch, 0); 290 EMU8000_CPF_WRITE(hw, ch, 0); 291 292 /* pitch offset */ 293 EMU8000_IP_WRITE(hw, ch, rec->pitch); 294 /* set envelope parameters */ 295 EMU8000_ENVVAL_WRITE(hw, ch, 0x8000); 296 EMU8000_ATKHLD_WRITE(hw, ch, 0x7f7f); 297 EMU8000_DCYSUS_WRITE(hw, ch, 0x7f7f); 298 EMU8000_ENVVOL_WRITE(hw, ch, 0x8000); 299 EMU8000_ATKHLDV_WRITE(hw, ch, 0x7f7f); 300 /* decay/sustain parameter for volume envelope is used 301 for triggerg the voice */ 302 /* modulation envelope heights */ 303 EMU8000_PEFE_WRITE(hw, ch, 0x0); 304 /* lfo1/2 delay */ 305 EMU8000_LFO1VAL_WRITE(hw, ch, 0x8000); 306 EMU8000_LFO2VAL_WRITE(hw, ch, 0x8000); 307 /* lfo1 pitch & cutoff shift */ 308 EMU8000_FMMOD_WRITE(hw, ch, 0); 309 /* lfo1 volume & freq */ 310 EMU8000_TREMFRQ_WRITE(hw, ch, 0); 311 /* lfo2 pitch & freq */ 312 EMU8000_FM2FRQ2_WRITE(hw, ch, 0); 313 /* pan & loop start */ 314 temp = rec->panning[ch]; 315 temp = (temp <<24) | ((unsigned int)rec->loop_start[ch] - 1); 316 EMU8000_PSST_WRITE(hw, ch, temp); 317 /* chorus & loop end (chorus 8bit, MSB) */ 318 temp = 0; // chorus 319 temp = (temp << 24) | ((unsigned int)rec->loop_start[ch] + rec->buf_size - 1); 320 EMU8000_CSL_WRITE(hw, ch, temp); 321 /* Q & current address (Q 4bit value, MSB) */ 322 temp = 0; // filterQ 323 temp = (temp << 28) | ((unsigned int)rec->loop_start[ch] - 1); 324 EMU8000_CCCA_WRITE(hw, ch, temp); 325 /* clear unknown registers */ 326 EMU8000_00A0_WRITE(hw, ch, 0); 327 EMU8000_0080_WRITE(hw, ch, 0); 328 } 329 330 /* 331 * trigger the voice 332 */ 333 static void start_voice(struct snd_emu8k_pcm *rec, int ch) 334 { 335 unsigned long flags; 336 struct snd_emu8000 *hw = rec->emu; 337 unsigned int temp, aux; 338 int pt = calc_pitch_target(rec->pitch); 339 340 /* cutoff and volume */ 341 EMU8000_IFATN_WRITE(hw, ch, 0xff00); 342 EMU8000_VTFT_WRITE(hw, ch, 0xffff); 343 EMU8000_CVCF_WRITE(hw, ch, 0xffff); 344 /* trigger envelope */ 345 EMU8000_DCYSUSV_WRITE(hw, ch, 0x7f7f); 346 /* set reverb and pitch target */ 347 temp = 0; // reverb 348 if (rec->panning[ch] == 0) 349 aux = 0xff; 350 else 351 aux = (-rec->panning[ch]) & 0xff; 352 temp = (temp << 8) | (pt << 16) | aux; 353 EMU8000_PTRX_WRITE(hw, ch, temp); 354 EMU8000_CPF_WRITE(hw, ch, pt << 16); 355 356 /* start timer */ 357 spin_lock_irqsave(&rec->timer_lock, flags); 358 if (! rec->timer_running) { 359 mod_timer(&rec->timer, jiffies + 1); 360 rec->timer_running = 1; 361 } 362 spin_unlock_irqrestore(&rec->timer_lock, flags); 363 } 364 365 /* 366 * stop the voice immediately 367 */ 368 static void stop_voice(struct snd_emu8k_pcm *rec, int ch) 369 { 370 unsigned long flags; 371 struct snd_emu8000 *hw = rec->emu; 372 373 EMU8000_DCYSUSV_WRITE(hw, ch, 0x807F); 374 375 /* stop timer */ 376 spin_lock_irqsave(&rec->timer_lock, flags); 377 if (rec->timer_running) { 378 del_timer(&rec->timer); 379 rec->timer_running = 0; 380 } 381 spin_unlock_irqrestore(&rec->timer_lock, flags); 382 } 383 384 static int emu8k_pcm_trigger(struct snd_pcm_substream *subs, int cmd) 385 { 386 struct snd_emu8k_pcm *rec = subs->runtime->private_data; 387 int ch; 388 389 switch (cmd) { 390 case SNDRV_PCM_TRIGGER_START: 391 for (ch = 0; ch < rec->voices; ch++) 392 start_voice(rec, ch); 393 rec->running = 1; 394 break; 395 case SNDRV_PCM_TRIGGER_STOP: 396 rec->running = 0; 397 for (ch = 0; ch < rec->voices; ch++) 398 stop_voice(rec, ch); 399 break; 400 default: 401 return -EINVAL; 402 } 403 return 0; 404 } 405 406 407 /* 408 * copy / silence ops 409 */ 410 411 /* 412 * this macro should be inserted in the copy/silence loops 413 * to reduce the latency. without this, the system will hang up 414 * during the whole loop. 415 */ 416 #define CHECK_SCHEDULER() \ 417 do { \ 418 cond_resched();\ 419 if (signal_pending(current))\ 420 return -EAGAIN;\ 421 } while (0) 422 423 424 #ifdef USE_NONINTERLEAVE 425 /* copy one channel block */ 426 static int emu8k_transfer_block(struct snd_emu8000 *emu, int offset, unsigned short *buf, int count) 427 { 428 EMU8000_SMALW_WRITE(emu, offset); 429 while (count > 0) { 430 unsigned short sval; 431 CHECK_SCHEDULER(); 432 if (get_user(sval, buf)) 433 return -EFAULT; 434 EMU8000_SMLD_WRITE(emu, sval); 435 buf++; 436 count--; 437 } 438 return 0; 439 } 440 441 static int emu8k_pcm_copy(struct snd_pcm_substream *subs, 442 int voice, 443 snd_pcm_uframes_t pos, 444 void *src, 445 snd_pcm_uframes_t count) 446 { 447 struct snd_emu8k_pcm *rec = subs->runtime->private_data; 448 struct snd_emu8000 *emu = rec->emu; 449 450 snd_emu8000_write_wait(emu, 1); 451 if (voice == -1) { 452 unsigned short *buf = src; 453 int i, err; 454 count /= rec->voices; 455 for (i = 0; i < rec->voices; i++) { 456 err = emu8k_transfer_block(emu, pos + rec->loop_start[i], buf, count); 457 if (err < 0) 458 return err; 459 buf += count; 460 } 461 return 0; 462 } else { 463 return emu8k_transfer_block(emu, pos + rec->loop_start[voice], src, count); 464 } 465 } 466 467 /* make a channel block silence */ 468 static int emu8k_silence_block(struct snd_emu8000 *emu, int offset, int count) 469 { 470 EMU8000_SMALW_WRITE(emu, offset); 471 while (count > 0) { 472 CHECK_SCHEDULER(); 473 EMU8000_SMLD_WRITE(emu, 0); 474 count--; 475 } 476 return 0; 477 } 478 479 static int emu8k_pcm_silence(struct snd_pcm_substream *subs, 480 int voice, 481 snd_pcm_uframes_t pos, 482 snd_pcm_uframes_t count) 483 { 484 struct snd_emu8k_pcm *rec = subs->runtime->private_data; 485 struct snd_emu8000 *emu = rec->emu; 486 487 snd_emu8000_write_wait(emu, 1); 488 if (voice == -1 && rec->voices == 1) 489 voice = 0; 490 if (voice == -1) { 491 int err; 492 err = emu8k_silence_block(emu, pos + rec->loop_start[0], count / 2); 493 if (err < 0) 494 return err; 495 return emu8k_silence_block(emu, pos + rec->loop_start[1], count / 2); 496 } else { 497 return emu8k_silence_block(emu, pos + rec->loop_start[voice], count); 498 } 499 } 500 501 #else /* interleave */ 502 503 /* 504 * copy the interleaved data can be done easily by using 505 * DMA "left" and "right" channels on emu8k engine. 506 */ 507 static int emu8k_pcm_copy(struct snd_pcm_substream *subs, 508 int voice, 509 snd_pcm_uframes_t pos, 510 void __user *src, 511 snd_pcm_uframes_t count) 512 { 513 struct snd_emu8k_pcm *rec = subs->runtime->private_data; 514 struct snd_emu8000 *emu = rec->emu; 515 unsigned short __user *buf = src; 516 517 snd_emu8000_write_wait(emu, 1); 518 EMU8000_SMALW_WRITE(emu, pos + rec->loop_start[0]); 519 if (rec->voices > 1) 520 EMU8000_SMARW_WRITE(emu, pos + rec->loop_start[1]); 521 522 while (count-- > 0) { 523 unsigned short sval; 524 CHECK_SCHEDULER(); 525 if (get_user(sval, buf)) 526 return -EFAULT; 527 EMU8000_SMLD_WRITE(emu, sval); 528 buf++; 529 if (rec->voices > 1) { 530 CHECK_SCHEDULER(); 531 if (get_user(sval, buf)) 532 return -EFAULT; 533 EMU8000_SMRD_WRITE(emu, sval); 534 buf++; 535 } 536 } 537 return 0; 538 } 539 540 static 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 */ 568 static 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 */ 593 static 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 */ 611 static 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 } 656 657 static 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 } 664 665 666 static 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 }; 678 679 680 static void snd_emu8000_pcm_free(struct snd_pcm *pcm) 681 { 682 struct snd_emu8000 *emu = pcm->private_data; 683 emu->pcm = NULL; 684 } 685 686 int 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