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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / sound / isa / sb / emu8000_pcm.c
blob91dc3d83e2cf8e9d1f01a4a92c20ad1865ccc2c7
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 struct 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 */
77 static int
78 emu8k_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 */
113 static void
114 snd_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 */
128 static void
129 emu8k_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
148 static 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
157 static 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 */
181 static 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 */
193 static 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 */
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 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
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 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 */
371 static 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
387 static 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() \
420 do { \
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 */
429 static 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
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 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
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 }
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