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Avoid beyond bounds copy while caching ACL
[zen-stable.git] / sound / isa / sb / emu8000_pcm.c
blob2f85c66f8e383c9feed771021a66626d775a4947
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 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 */
228 static 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
258 static 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 */
269 static 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 */
283 static 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 */
336 static 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 */
372 static 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
388 static 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() \
421 do { \
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 */
430 static 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
445 static 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 */
472 static 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
483 static 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 */
511 static 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
544 static 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 */
572 static 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 */
597 static 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 */
615 static 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
661 static 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
670 static 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
684 static void snd_emu8000_pcm_free(struct snd_pcm *pcm)
685 {
686 struct snd_emu8000 *emu = pcm->private_data;
687 emu->pcm = NULL;
688 }
689
690 int 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 }