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Linux-2.6.12-rc2
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / sound / isa / sb / emu8000_pcm.c
blobdb5eb8b55058453a45cb4b1c4d3af32e97c3b47c
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 typedef struct snd_emu8k_pcm emu8k_pcm_t;
50
51 struct snd_emu8k_pcm {
52 emu8000_t *emu;
53 snd_pcm_substream_t *substream;
54
55 unsigned int allocated_bytes;
56 snd_util_memblk_t *block;
57 unsigned int offset;
58 unsigned int buf_size;
59 unsigned int period_size;
60 unsigned int loop_start[2];
61 unsigned int pitch;
62 int panning[2];
63 int last_ptr;
64 int period_pos;
65 int voices;
66 unsigned int dram_opened: 1;
67 unsigned int running: 1;
68 unsigned int timer_running: 1;
69 struct timer_list timer;
70 spinlock_t timer_lock;
71 };
72
73 #define LOOP_BLANK_SIZE 8
74
75
76 /*
77 * open up channels for the simultaneous data transfer and playback
78 */
79 static int
80 emu8k_open_dram_for_pcm(emu8000_t *emu, int channels)
81 {
82 int i;
83
84 /* reserve up to 2 voices for playback */
85 snd_emux_lock_voice(emu->emu, 0);
86 if (channels > 1)
87 snd_emux_lock_voice(emu->emu, 1);
88
89 /* reserve 28 voices for loading */
90 for (i = channels + 1; i < EMU8000_DRAM_VOICES; i++) {
91 unsigned int mode = EMU8000_RAM_WRITE;
92 snd_emux_lock_voice(emu->emu, i);
93 #ifndef USE_NONINTERLEAVE
94 if (channels > 1 && (i & 1) != 0)
95 mode |= EMU8000_RAM_RIGHT;
96 #endif
97 snd_emu8000_dma_chan(emu, i, mode);
98 }
99
100 /* assign voice 31 and 32 to ROM */
101 EMU8000_VTFT_WRITE(emu, 30, 0);
102 EMU8000_PSST_WRITE(emu, 30, 0x1d8);
103 EMU8000_CSL_WRITE(emu, 30, 0x1e0);
104 EMU8000_CCCA_WRITE(emu, 30, 0x1d8);
105 EMU8000_VTFT_WRITE(emu, 31, 0);
106 EMU8000_PSST_WRITE(emu, 31, 0x1d8);
107 EMU8000_CSL_WRITE(emu, 31, 0x1e0);
108 EMU8000_CCCA_WRITE(emu, 31, 0x1d8);
109
110 return 0;
111 }
112
113 /*
114 */
115 static void
116 snd_emu8000_write_wait(emu8000_t *emu, int can_schedule)
117 {
118 while ((EMU8000_SMALW_READ(emu) & 0x80000000) != 0) {
119 if (can_schedule) {
120 set_current_state(TASK_INTERRUPTIBLE);
121 schedule_timeout(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(emu8000_t *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 snd_pcm_hardware_t 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(emu8k_pcm_t *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 emu8k_pcm_t *rec = (emu8k_pcm_t *)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 rec->timer.expires = jiffies + 1;
213 add_timer(&rec->timer);
214
215 /* update period */
216 if (rec->period_pos >= (int)rec->period_size) {
217 rec->period_pos %= rec->period_size;
218 spin_unlock(&rec->timer_lock);
219 snd_pcm_period_elapsed(rec->substream);
220 return;
221 }
222 spin_unlock(&rec->timer_lock);
223 }
224
225
226 /*
227 * open pcm
228 * creating an instance here
229 */
230 static int emu8k_pcm_open(snd_pcm_substream_t *subs)
231 {
232 emu8000_t *emu = snd_pcm_substream_chip(subs);
233 emu8k_pcm_t *rec;
234 snd_pcm_runtime_t *runtime = subs->runtime;
235
236 rec = kcalloc(1, sizeof(*rec), GFP_KERNEL);
237 if (! rec)
238 return -ENOMEM;
239
240 rec->emu = emu;
241 rec->substream = subs;
242 runtime->private_data = rec;
243
244 spin_lock_init(&rec->timer_lock);
245 init_timer(&rec->timer);
246 rec->timer.function = emu8k_pcm_timer_func;
247 rec->timer.data = (unsigned long)rec;
248
249 runtime->hw = emu8k_pcm_hw;
250 runtime->hw.buffer_bytes_max = emu->mem_size - LOOP_BLANK_SIZE * 3;
251 runtime->hw.period_bytes_max = runtime->hw.buffer_bytes_max / 2;
252
253 /* use timer to update periods.. (specified in msec) */
254 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
255 (1000000 + HZ - 1) / HZ, UINT_MAX);
256
257 return 0;
258 }
259
260 static int emu8k_pcm_close(snd_pcm_substream_t *subs)
261 {
262 emu8k_pcm_t *rec = subs->runtime->private_data;
263 kfree(rec);
264 subs->runtime->private_data = NULL;
265 return 0;
266 }
267
268 /*
269 * calculate pitch target
270 */
271 static int calc_pitch_target(int pitch)
272 {
273 int ptarget = 1 << (pitch >> 12);
274 if (pitch & 0x800) ptarget += (ptarget * 0x102e) / 0x2710;
275 if (pitch & 0x400) ptarget += (ptarget * 0x764) / 0x2710;
276 if (pitch & 0x200) ptarget += (ptarget * 0x389) / 0x2710;
277 ptarget += (ptarget >> 1);
278 if (ptarget > 0xffff) ptarget = 0xffff;
279 return ptarget;
280 }
281
282 /*
283 * set up the voice
284 */
285 static void setup_voice(emu8k_pcm_t *rec, int ch)
286 {
287 emu8000_t *hw = rec->emu;
288 unsigned int temp;
289
290 /* channel to be silent and idle */
291 EMU8000_DCYSUSV_WRITE(hw, ch, 0x0080);
292 EMU8000_VTFT_WRITE(hw, ch, 0x0000FFFF);
293 EMU8000_CVCF_WRITE(hw, ch, 0x0000FFFF);
294 EMU8000_PTRX_WRITE(hw, ch, 0);
295 EMU8000_CPF_WRITE(hw, ch, 0);
296
297 /* pitch offset */
298 EMU8000_IP_WRITE(hw, ch, rec->pitch);
299 /* set envelope parameters */
300 EMU8000_ENVVAL_WRITE(hw, ch, 0x8000);
301 EMU8000_ATKHLD_WRITE(hw, ch, 0x7f7f);
302 EMU8000_DCYSUS_WRITE(hw, ch, 0x7f7f);
303 EMU8000_ENVVOL_WRITE(hw, ch, 0x8000);
304 EMU8000_ATKHLDV_WRITE(hw, ch, 0x7f7f);
305 /* decay/sustain parameter for volume envelope is used
306 for triggerg the voice */
307 /* modulation envelope heights */
308 EMU8000_PEFE_WRITE(hw, ch, 0x0);
309 /* lfo1/2 delay */
310 EMU8000_LFO1VAL_WRITE(hw, ch, 0x8000);
311 EMU8000_LFO2VAL_WRITE(hw, ch, 0x8000);
312 /* lfo1 pitch & cutoff shift */
313 EMU8000_FMMOD_WRITE(hw, ch, 0);
314 /* lfo1 volume & freq */
315 EMU8000_TREMFRQ_WRITE(hw, ch, 0);
316 /* lfo2 pitch & freq */
317 EMU8000_FM2FRQ2_WRITE(hw, ch, 0);
318 /* pan & loop start */
319 temp = rec->panning[ch];
320 temp = (temp <<24) | ((unsigned int)rec->loop_start[ch] - 1);
321 EMU8000_PSST_WRITE(hw, ch, temp);
322 /* chorus & loop end (chorus 8bit, MSB) */
323 temp = 0; // chorus
324 temp = (temp << 24) | ((unsigned int)rec->loop_start[ch] + rec->buf_size - 1);
325 EMU8000_CSL_WRITE(hw, ch, temp);
326 /* Q & current address (Q 4bit value, MSB) */
327 temp = 0; // filterQ
328 temp = (temp << 28) | ((unsigned int)rec->loop_start[ch] - 1);
329 EMU8000_CCCA_WRITE(hw, ch, temp);
330 /* clear unknown registers */
331 EMU8000_00A0_WRITE(hw, ch, 0);
332 EMU8000_0080_WRITE(hw, ch, 0);
333 }
334
335 /*
336 * trigger the voice
337 */
338 static void start_voice(emu8k_pcm_t *rec, int ch)
339 {
340 unsigned long flags;
341 emu8000_t *hw = rec->emu;
342 unsigned int temp, aux;
343 int pt = calc_pitch_target(rec->pitch);
344
345 /* cutoff and volume */
346 EMU8000_IFATN_WRITE(hw, ch, 0xff00);
347 EMU8000_VTFT_WRITE(hw, ch, 0xffff);
348 EMU8000_CVCF_WRITE(hw, ch, 0xffff);
349 /* trigger envelope */
350 EMU8000_DCYSUSV_WRITE(hw, ch, 0x7f7f);
351 /* set reverb and pitch target */
352 temp = 0; // reverb
353 if (rec->panning[ch] == 0)
354 aux = 0xff;
355 else
356 aux = (-rec->panning[ch]) & 0xff;
357 temp = (temp << 8) | (pt << 16) | aux;
358 EMU8000_PTRX_WRITE(hw, ch, temp);
359 EMU8000_CPF_WRITE(hw, ch, pt << 16);
360
361 /* start timer */
362 spin_lock_irqsave(&rec->timer_lock, flags);
363 if (! rec->timer_running) {
364 rec->timer.expires = jiffies + 1;
365 add_timer(&rec->timer);
366 rec->timer_running = 1;
367 }
368 spin_unlock_irqrestore(&rec->timer_lock, flags);
369 }
370
371 /*
372 * stop the voice immediately
373 */
374 static void stop_voice(emu8k_pcm_t *rec, int ch)
375 {
376 unsigned long flags;
377 emu8000_t *hw = rec->emu;
378
379 EMU8000_DCYSUSV_WRITE(hw, ch, 0x807F);
380
381 /* stop timer */
382 spin_lock_irqsave(&rec->timer_lock, flags);
383 if (rec->timer_running) {
384 del_timer(&rec->timer);
385 rec->timer_running = 0;
386 }
387 spin_unlock_irqrestore(&rec->timer_lock, flags);
388 }
389
390 static int emu8k_pcm_trigger(snd_pcm_substream_t *subs, int cmd)
391 {
392 emu8k_pcm_t *rec = subs->runtime->private_data;
393 int ch;
394
395 switch (cmd) {
396 case SNDRV_PCM_TRIGGER_START:
397 for (ch = 0; ch < rec->voices; ch++)
398 start_voice(rec, ch);
399 rec->running = 1;
400 break;
401 case SNDRV_PCM_TRIGGER_STOP:
402 rec->running = 0;
403 for (ch = 0; ch < rec->voices; ch++)
404 stop_voice(rec, ch);
405 break;
406 default:
407 return -EINVAL;
408 }
409 return 0;
410 }
411
412
413 /*
414 * copy / silence ops
415 */
416
417 /*
418 * this macro should be inserted in the copy/silence loops
419 * to reduce the latency. without this, the system will hang up
420 * during the whole loop.
421 */
422 #define CHECK_SCHEDULER() \
423 do { \
424 cond_resched();\
425 if (signal_pending(current))\
426 return -EAGAIN;\
427 } while (0)
428
429
430 #ifdef USE_NONINTERLEAVE
431 /* copy one channel block */
432 static int emu8k_transfer_block(emu8000_t *emu, int offset, unsigned short *buf, int count)
433 {
434 EMU8000_SMALW_WRITE(emu, offset);
435 while (count > 0) {
436 unsigned short sval;
437 CHECK_SCHEDULER();
438 get_user(sval, buf);
439 EMU8000_SMLD_WRITE(emu, sval);
440 buf++;
441 count--;
442 }
443 return 0;
444 }
445
446 static int emu8k_pcm_copy(snd_pcm_substream_t *subs,
447 int voice,
448 snd_pcm_uframes_t pos,
449 void *src,
450 snd_pcm_uframes_t count)
451 {
452 emu8k_pcm_t *rec = subs->runtime->private_data;
453 emu8000_t *emu = rec->emu;
454
455 snd_emu8000_write_wait(emu, 1);
456 if (voice == -1) {
457 unsigned short *buf = src;
458 int i, err;
459 count /= rec->voices;
460 for (i = 0; i < rec->voices; i++) {
461 err = emu8k_transfer_block(emu, pos + rec->loop_start[i], buf, count);
462 if (err < 0)
463 return err;
464 buf += count;
465 }
466 return 0;
467 } else {
468 return emu8k_transfer_block(emu, pos + rec->loop_start[voice], src, count);
469 }
470 }
471
472 /* make a channel block silence */
473 static int emu8k_silence_block(emu8000_t *emu, int offset, int count)
474 {
475 EMU8000_SMALW_WRITE(emu, offset);
476 while (count > 0) {
477 CHECK_SCHEDULER();
478 EMU8000_SMLD_WRITE(emu, 0);
479 count--;
480 }
481 return 0;
482 }
483
484 static int emu8k_pcm_silence(snd_pcm_substream_t *subs,
485 int voice,
486 snd_pcm_uframes_t pos,
487 snd_pcm_uframes_t count)
488 {
489 emu8k_pcm_t *rec = subs->runtime->private_data;
490 emu8000_t *emu = rec->emu;
491
492 snd_emu8000_write_wait(emu, 1);
493 if (voice == -1 && rec->voices == 1)
494 voice = 0;
495 if (voice == -1) {
496 int err;
497 err = emu8k_silence_block(emu, pos + rec->loop_start[0], count / 2);
498 if (err < 0)
499 return err;
500 return emu8k_silence_block(emu, pos + rec->loop_start[1], count / 2);
501 } else {
502 return emu8k_silence_block(emu, pos + rec->loop_start[voice], count);
503 }
504 }
505
506 #else /* interleave */
507
508 /*
509 * copy the interleaved data can be done easily by using
510 * DMA "left" and "right" channels on emu8k engine.
511 */
512 static int emu8k_pcm_copy(snd_pcm_substream_t *subs,
513 int voice,
514 snd_pcm_uframes_t pos,
515 void __user *src,
516 snd_pcm_uframes_t count)
517 {
518 emu8k_pcm_t *rec = subs->runtime->private_data;
519 emu8000_t *emu = rec->emu;
520 unsigned short __user *buf = src;
521
522 snd_emu8000_write_wait(emu, 1);
523 EMU8000_SMALW_WRITE(emu, pos + rec->loop_start[0]);
524 if (rec->voices > 1)
525 EMU8000_SMARW_WRITE(emu, pos + rec->loop_start[1]);
526
527 while (count-- > 0) {
528 unsigned short sval;
529 CHECK_SCHEDULER();
530 get_user(sval, buf);
531 EMU8000_SMLD_WRITE(emu, sval);
532 buf++;
533 if (rec->voices > 1) {
534 CHECK_SCHEDULER();
535 get_user(sval, buf);
536 EMU8000_SMRD_WRITE(emu, sval);
537 buf++;
538 }
539 }
540 return 0;
541 }
542
543 static int emu8k_pcm_silence(snd_pcm_substream_t *subs,
544 int voice,
545 snd_pcm_uframes_t pos,
546 snd_pcm_uframes_t count)
547 {
548 emu8k_pcm_t *rec = subs->runtime->private_data;
549 emu8000_t *emu = rec->emu;
550
551 snd_emu8000_write_wait(emu, 1);
552 EMU8000_SMALW_WRITE(emu, rec->loop_start[0] + pos);
553 if (rec->voices > 1)
554 EMU8000_SMARW_WRITE(emu, rec->loop_start[1] + pos);
555 while (count-- > 0) {
556 CHECK_SCHEDULER();
557 EMU8000_SMLD_WRITE(emu, 0);
558 if (rec->voices > 1) {
559 CHECK_SCHEDULER();
560 EMU8000_SMRD_WRITE(emu, 0);
561 }
562 }
563 return 0;
564 }
565 #endif
566
567
568 /*
569 * allocate a memory block
570 */
571 static int emu8k_pcm_hw_params(snd_pcm_substream_t *subs,
572 snd_pcm_hw_params_t *hw_params)
573 {
574 emu8k_pcm_t *rec = subs->runtime->private_data;
575
576 if (rec->block) {
577 /* reallocation - release the old block */
578 snd_util_mem_free(rec->emu->memhdr, rec->block);
579 rec->block = NULL;
580 }
581
582 rec->allocated_bytes = params_buffer_bytes(hw_params) + LOOP_BLANK_SIZE * 4;
583 rec->block = snd_util_mem_alloc(rec->emu->memhdr, rec->allocated_bytes);
584 if (! rec->block)
585 return -ENOMEM;
586 rec->offset = EMU8000_DRAM_OFFSET + (rec->block->offset >> 1); /* in word */
587 /* at least dma_bytes must be set for non-interleaved mode */
588 subs->dma_buffer.bytes = params_buffer_bytes(hw_params);
589
590 return 0;
591 }
592
593 /*
594 * free the memory block
595 */
596 static int emu8k_pcm_hw_free(snd_pcm_substream_t *subs)
597 {
598 emu8k_pcm_t *rec = subs->runtime->private_data;
599
600 if (rec->block) {
601 int ch;
602 for (ch = 0; ch < rec->voices; ch++)
603 stop_voice(rec, ch); // to be sure
604 if (rec->dram_opened)
605 emu8k_close_dram(rec->emu);
606 snd_util_mem_free(rec->emu->memhdr, rec->block);
607 rec->block = NULL;
608 }
609 return 0;
610 }
611
612 /*
613 */
614 static int emu8k_pcm_prepare(snd_pcm_substream_t *subs)
615 {
616 emu8k_pcm_t *rec = subs->runtime->private_data;
617
618 rec->pitch = 0xe000 + calc_rate_offset(subs->runtime->rate);
619 rec->last_ptr = 0;
620 rec->period_pos = 0;
621
622 rec->buf_size = subs->runtime->buffer_size;
623 rec->period_size = subs->runtime->period_size;
624 rec->voices = subs->runtime->channels;
625 rec->loop_start[0] = rec->offset + LOOP_BLANK_SIZE;
626 if (rec->voices > 1)
627 rec->loop_start[1] = rec->loop_start[0] + rec->buf_size + LOOP_BLANK_SIZE;
628 if (rec->voices > 1) {
629 rec->panning[0] = 0xff;
630 rec->panning[1] = 0x00;
631 } else
632 rec->panning[0] = 0x80;
633
634 if (! rec->dram_opened) {
635 int err, i, ch;
636
637 snd_emux_terminate_all(rec->emu->emu);
638 if ((err = emu8k_open_dram_for_pcm(rec->emu, rec->voices)) != 0)
639 return err;
640 rec->dram_opened = 1;
641
642 /* clear loop blanks */
643 snd_emu8000_write_wait(rec->emu, 0);
644 EMU8000_SMALW_WRITE(rec->emu, rec->offset);
645 for (i = 0; i < LOOP_BLANK_SIZE; i++)
646 EMU8000_SMLD_WRITE(rec->emu, 0);
647 for (ch = 0; ch < rec->voices; ch++) {
648 EMU8000_SMALW_WRITE(rec->emu, rec->loop_start[ch] + rec->buf_size);
649 for (i = 0; i < LOOP_BLANK_SIZE; i++)
650 EMU8000_SMLD_WRITE(rec->emu, 0);
651 }
652 }
653
654 setup_voice(rec, 0);
655 if (rec->voices > 1)
656 setup_voice(rec, 1);
657 return 0;
658 }
659
660 static snd_pcm_uframes_t emu8k_pcm_pointer(snd_pcm_substream_t *subs)
661 {
662 emu8k_pcm_t *rec = subs->runtime->private_data;
663 if (rec->running)
664 return emu8k_get_curpos(rec, 0);
665 return 0;
666 }
667
668
669 static snd_pcm_ops_t emu8k_pcm_ops = {
670 .open = emu8k_pcm_open,
671 .close = emu8k_pcm_close,
672 .ioctl = snd_pcm_lib_ioctl,
673 .hw_params = emu8k_pcm_hw_params,
674 .hw_free = emu8k_pcm_hw_free,
675 .prepare = emu8k_pcm_prepare,
676 .trigger = emu8k_pcm_trigger,
677 .pointer = emu8k_pcm_pointer,
678 .copy = emu8k_pcm_copy,
679 .silence = emu8k_pcm_silence,
680 };
681
682
683 static void snd_emu8000_pcm_free(snd_pcm_t *pcm)
684 {
685 emu8000_t *emu = pcm->private_data;
686 emu->pcm = NULL;
687 }
688
689 int snd_emu8000_pcm_new(snd_card_t *card, emu8000_t *emu, int index)
690 {
691 snd_pcm_t *pcm;
692 int err;
693
694 if ((err = snd_pcm_new(card, "Emu8000 PCM", index, 1, 0, &pcm)) < 0)
695 return err;
696 pcm->private_data = emu;
697 pcm->private_free = snd_emu8000_pcm_free;
698 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &emu8k_pcm_ops);
699 emu->pcm = pcm;
700
701 snd_device_register(card, pcm);
702
703 return 0;
704 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree