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x86/mm/pat: Don't report PAT on CPUs that don't support it
[linux/fpc-iii.git] / sound / isa / sb / emu8000_pcm.c
blob32f234f494e5734e6a9619f840ce3935dc6ba7f4
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 }
Linux with added FPC-III support