Merge master.kernel.org:/pub/scm/linux/kernel/git/perex/alsa
[linux-2.6] / sound / isa / sb / emu8000_pcm.c
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 }