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TOMOYO Linux Cross Reference
Linux/sound/isa/sb/emu8000_pcm.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  * pcm emulation on emu8000 wavetable
  4  *
  5  *  Copyright (C) 2002 Takashi Iwai <tiwai@suse.de>
  6  */
  7 
  8 #include "emu8000_local.h"
  9 
 10 #include <linux/sched/signal.h>
 11 #include <linux/init.h>
 12 #include <linux/slab.h>
 13 #include <sound/initval.h>
 14 #include <sound/pcm.h>
 15 
 16 /*
 17  * define the following if you want to use this pcm with non-interleaved mode
 18  */
 19 /* #define USE_NONINTERLEAVE */
 20 
 21 /* NOTE: for using the non-interleaved mode with alsa-lib, you have to set
 22  * mmap_emulation flag to 1 in your .asoundrc, such like
 23  *
 24  *      pcm.emu8k {
 25  *              type plug
 26  *              slave.pcm {
 27  *                      type hw
 28  *                      card 0
 29  *                      device 1
 30  *                      mmap_emulation 1
 31  *              }
 32  *      }
 33  *
 34  * besides, for the time being, the non-interleaved mode doesn't work well on
 35  * alsa-lib...
 36  */
 37 
 38 
 39 struct snd_emu8k_pcm {
 40         struct snd_emu8000 *emu;
 41         struct snd_pcm_substream *substream;
 42 
 43         unsigned int allocated_bytes;
 44         struct snd_util_memblk *block;
 45         unsigned int offset;
 46         unsigned int buf_size;
 47         unsigned int period_size;
 48         unsigned int loop_start[2];
 49         unsigned int pitch;
 50         int panning[2];
 51         int last_ptr;
 52         int period_pos;
 53         int voices;
 54         unsigned int dram_opened: 1;
 55         unsigned int running: 1;
 56         unsigned int timer_running: 1;
 57         struct timer_list timer;
 58         spinlock_t timer_lock;
 59 };
 60 
 61 #define LOOP_BLANK_SIZE         8
 62 
 63 
 64 /*
 65  * open up channels for the simultaneous data transfer and playback
 66  */
 67 static int
 68 emu8k_open_dram_for_pcm(struct snd_emu8000 *emu, int channels)
 69 {
 70         int i;
 71 
 72         /* reserve up to 2 voices for playback */
 73         snd_emux_lock_voice(emu->emu, 0);
 74         if (channels > 1)
 75                 snd_emux_lock_voice(emu->emu, 1);
 76 
 77         /* reserve 28 voices for loading */
 78         for (i = channels + 1; i < EMU8000_DRAM_VOICES; i++) {
 79                 unsigned int mode = EMU8000_RAM_WRITE;
 80                 snd_emux_lock_voice(emu->emu, i);
 81 #ifndef USE_NONINTERLEAVE
 82                 if (channels > 1 && (i & 1) != 0)
 83                         mode |= EMU8000_RAM_RIGHT;
 84 #endif
 85                 snd_emu8000_dma_chan(emu, i, mode);
 86         }
 87 
 88         /* assign voice 31 and 32 to ROM */
 89         EMU8000_VTFT_WRITE(emu, 30, 0);
 90         EMU8000_PSST_WRITE(emu, 30, 0x1d8);
 91         EMU8000_CSL_WRITE(emu, 30, 0x1e0);
 92         EMU8000_CCCA_WRITE(emu, 30, 0x1d8);
 93         EMU8000_VTFT_WRITE(emu, 31, 0);
 94         EMU8000_PSST_WRITE(emu, 31, 0x1d8);
 95         EMU8000_CSL_WRITE(emu, 31, 0x1e0);
 96         EMU8000_CCCA_WRITE(emu, 31, 0x1d8);
 97 
 98         return 0;
 99 }
100 
101 /*
102  */
103 static void
104 snd_emu8000_write_wait(struct snd_emu8000 *emu, int can_schedule)
105 {
106         while ((EMU8000_SMALW_READ(emu) & 0x80000000) != 0) {
107                 if (can_schedule) {
108                         schedule_timeout_interruptible(1);
109                         if (signal_pending(current))
110                                 break;
111                 }
112         }
113 }
114 
115 /*
116  * close all channels
117  */
118 static void
119 emu8k_close_dram(struct snd_emu8000 *emu)
120 {
121         int i;
122 
123         for (i = 0; i < 2; i++)
124                 snd_emux_unlock_voice(emu->emu, i);
125         for (; i < EMU8000_DRAM_VOICES; i++) {
126                 snd_emu8000_dma_chan(emu, i, EMU8000_RAM_CLOSE);
127                 snd_emux_unlock_voice(emu->emu, i);
128         }
129 }
130 
131 /*
132  * convert Hz to AWE32 rate offset (see emux/soundfont.c)
133  */
134 
135 #define OFFSET_SAMPLERATE       1011119         /* base = 44100 */
136 #define SAMPLERATE_RATIO        4096
137 
138 static int calc_rate_offset(int hz)
139 {
140         return snd_sf_linear_to_log(hz, OFFSET_SAMPLERATE, SAMPLERATE_RATIO);
141 }
142 
143 
144 /*
145  */
146 
147 static const struct snd_pcm_hardware emu8k_pcm_hw = {
148 #ifdef USE_NONINTERLEAVE
149         .info =                 SNDRV_PCM_INFO_NONINTERLEAVED,
150 #else
151         .info =                 SNDRV_PCM_INFO_INTERLEAVED,
152 #endif
153         .formats =              SNDRV_PCM_FMTBIT_S16_LE,
154         .rates =                SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
155         .rate_min =             4000,
156         .rate_max =             48000,
157         .channels_min =         1,
158         .channels_max =         2,
159         .buffer_bytes_max =     (128*1024),
160         .period_bytes_min =     1024,
161         .period_bytes_max =     (128*1024),
162         .periods_min =          2,
163         .periods_max =          1024,
164         .fifo_size =            0,
165 
166 };
167 
168 /*
169  * get the current position at the given channel from CCCA register
170  */
171 static inline int emu8k_get_curpos(struct snd_emu8k_pcm *rec, int ch)
172 {
173         int val = EMU8000_CCCA_READ(rec->emu, ch) & 0xfffffff;
174         val -= rec->loop_start[ch] - 1;
175         return val;
176 }
177 
178 
179 /*
180  * timer interrupt handler
181  * check the current position and update the period if necessary.
182  */
183 static void emu8k_pcm_timer_func(struct timer_list *t)
184 {
185         struct snd_emu8k_pcm *rec = from_timer(rec, t, timer);
186         int ptr, delta;
187 
188         spin_lock(&rec->timer_lock);
189         /* update the current pointer */
190         ptr = emu8k_get_curpos(rec, 0);
191         if (ptr < rec->last_ptr)
192                 delta = ptr + rec->buf_size - rec->last_ptr;
193         else
194                 delta = ptr - rec->last_ptr;
195         rec->period_pos += delta;
196         rec->last_ptr = ptr;
197 
198         /* reprogram timer */
199         mod_timer(&rec->timer, jiffies + 1);
200 
201         /* update period */
202         if (rec->period_pos >= (int)rec->period_size) {
203                 rec->period_pos %= rec->period_size;
204                 spin_unlock(&rec->timer_lock);
205                 snd_pcm_period_elapsed(rec->substream);
206                 return;
207         }
208         spin_unlock(&rec->timer_lock);
209 }
210 
211 
212 /*
213  * open pcm
214  * creating an instance here
215  */
216 static int emu8k_pcm_open(struct snd_pcm_substream *subs)
217 {
218         struct snd_emu8000 *emu = snd_pcm_substream_chip(subs);
219         struct snd_emu8k_pcm *rec;
220         struct snd_pcm_runtime *runtime = subs->runtime;
221 
222         rec = kzalloc(sizeof(*rec), GFP_KERNEL);
223         if (! rec)
224                 return -ENOMEM;
225 
226         rec->emu = emu;
227         rec->substream = subs;
228         runtime->private_data = rec;
229 
230         spin_lock_init(&rec->timer_lock);
231         timer_setup(&rec->timer, emu8k_pcm_timer_func, 0);
232 
233         runtime->hw = emu8k_pcm_hw;
234         runtime->hw.buffer_bytes_max = emu->mem_size - LOOP_BLANK_SIZE * 3;
235         runtime->hw.period_bytes_max = runtime->hw.buffer_bytes_max / 2;
236 
237         /* use timer to update periods.. (specified in msec) */
238         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
239                                      (1000000 + HZ - 1) / HZ, UINT_MAX);
240 
241         return 0;
242 }
243 
244 static int emu8k_pcm_close(struct snd_pcm_substream *subs)
245 {
246         struct snd_emu8k_pcm *rec = subs->runtime->private_data;
247         kfree(rec);
248         subs->runtime->private_data = NULL;
249         return 0;
250 }
251 
252 /*
253  * calculate pitch target
254  */
255 static int calc_pitch_target(int pitch)
256 {
257         int ptarget = 1 << (pitch >> 12);
258         if (pitch & 0x800) ptarget += (ptarget * 0x102e) / 0x2710;
259         if (pitch & 0x400) ptarget += (ptarget * 0x764) / 0x2710;
260         if (pitch & 0x200) ptarget += (ptarget * 0x389) / 0x2710;
261         ptarget += (ptarget >> 1);
262         if (ptarget > 0xffff) ptarget = 0xffff;
263         return ptarget;
264 }
265 
266 /*
267  * set up the voice
268  */
269 static void setup_voice(struct snd_emu8k_pcm *rec, int ch)
270 {
271         struct snd_emu8000 *hw = rec->emu;
272         unsigned int temp;
273 
274         /* channel to be silent and idle */
275         EMU8000_DCYSUSV_WRITE(hw, ch, 0x0080);
276         EMU8000_VTFT_WRITE(hw, ch, 0x0000FFFF);
277         EMU8000_CVCF_WRITE(hw, ch, 0x0000FFFF);
278         EMU8000_PTRX_WRITE(hw, ch, 0);
279         EMU8000_CPF_WRITE(hw, ch, 0);
280 
281         /* pitch offset */
282         EMU8000_IP_WRITE(hw, ch, rec->pitch);
283         /* set envelope parameters */
284         EMU8000_ENVVAL_WRITE(hw, ch, 0x8000);
285         EMU8000_ATKHLD_WRITE(hw, ch, 0x7f7f);
286         EMU8000_DCYSUS_WRITE(hw, ch, 0x7f7f);
287         EMU8000_ENVVOL_WRITE(hw, ch, 0x8000);
288         EMU8000_ATKHLDV_WRITE(hw, ch, 0x7f7f);
289         /* decay/sustain parameter for volume envelope is used
290            for triggerg the voice */
291         /* modulation envelope heights */
292         EMU8000_PEFE_WRITE(hw, ch, 0x0);
293         /* lfo1/2 delay */
294         EMU8000_LFO1VAL_WRITE(hw, ch, 0x8000);
295         EMU8000_LFO2VAL_WRITE(hw, ch, 0x8000);
296         /* lfo1 pitch & cutoff shift */
297         EMU8000_FMMOD_WRITE(hw, ch, 0);
298         /* lfo1 volume & freq */
299         EMU8000_TREMFRQ_WRITE(hw, ch, 0);
300         /* lfo2 pitch & freq */
301         EMU8000_FM2FRQ2_WRITE(hw, ch, 0);
302         /* pan & loop start */
303         temp = rec->panning[ch];
304         temp = (temp <<24) | ((unsigned int)rec->loop_start[ch] - 1);
305         EMU8000_PSST_WRITE(hw, ch, temp);
306         /* chorus & loop end (chorus 8bit, MSB) */
307         temp = 0; // chorus
308         temp = (temp << 24) | ((unsigned int)rec->loop_start[ch] + rec->buf_size - 1);
309         EMU8000_CSL_WRITE(hw, ch, temp);
310         /* Q & current address (Q 4bit value, MSB) */
311         temp = 0; // filterQ
312         temp = (temp << 28) | ((unsigned int)rec->loop_start[ch] - 1);
313         EMU8000_CCCA_WRITE(hw, ch, temp);
314         /* clear unknown registers */
315         EMU8000_00A0_WRITE(hw, ch, 0);
316         EMU8000_0080_WRITE(hw, ch, 0);
317 }
318 
319 /*
320  * trigger the voice
321  */
322 static void start_voice(struct snd_emu8k_pcm *rec, int ch)
323 {
324         unsigned long flags;
325         struct snd_emu8000 *hw = rec->emu;
326         unsigned int temp, aux;
327         int pt = calc_pitch_target(rec->pitch);
328 
329         /* cutoff and volume */
330         EMU8000_IFATN_WRITE(hw, ch, 0xff00);
331         EMU8000_VTFT_WRITE(hw, ch, 0xffff);
332         EMU8000_CVCF_WRITE(hw, ch, 0xffff);
333         /* trigger envelope */
334         EMU8000_DCYSUSV_WRITE(hw, ch, 0x7f7f);
335         /* set reverb and pitch target */
336         temp = 0; // reverb
337         if (rec->panning[ch] == 0)
338                 aux = 0xff;
339         else
340                 aux = (-rec->panning[ch]) & 0xff;
341         temp = (temp << 8) | (pt << 16) | aux;
342         EMU8000_PTRX_WRITE(hw, ch, temp);
343         EMU8000_CPF_WRITE(hw, ch, pt << 16);
344 
345         /* start timer */
346         spin_lock_irqsave(&rec->timer_lock, flags);
347         if (! rec->timer_running) {
348                 mod_timer(&rec->timer, jiffies + 1);
349                 rec->timer_running = 1;
350         }
351         spin_unlock_irqrestore(&rec->timer_lock, flags);
352 }
353 
354 /*
355  * stop the voice immediately
356  */
357 static void stop_voice(struct snd_emu8k_pcm *rec, int ch)
358 {
359         unsigned long flags;
360         struct snd_emu8000 *hw = rec->emu;
361 
362         EMU8000_DCYSUSV_WRITE(hw, ch, 0x807F);
363 
364         /* stop timer */
365         spin_lock_irqsave(&rec->timer_lock, flags);
366         if (rec->timer_running) {
367                 del_timer(&rec->timer);
368                 rec->timer_running = 0;
369         }
370         spin_unlock_irqrestore(&rec->timer_lock, flags);
371 }
372 
373 static int emu8k_pcm_trigger(struct snd_pcm_substream *subs, int cmd)
374 {
375         struct snd_emu8k_pcm *rec = subs->runtime->private_data;
376         int ch;
377 
378         switch (cmd) {
379         case SNDRV_PCM_TRIGGER_START:
380                 for (ch = 0; ch < rec->voices; ch++)
381                         start_voice(rec, ch);
382                 rec->running = 1;
383                 break;
384         case SNDRV_PCM_TRIGGER_STOP:
385                 rec->running = 0;
386                 for (ch = 0; ch < rec->voices; ch++)
387                         stop_voice(rec, ch);
388                 break;
389         default:
390                 return -EINVAL;
391         }
392         return 0;
393 }
394 
395 
396 /*
397  * copy / silence ops
398  */
399 
400 /*
401  * this macro should be inserted in the copy/silence loops
402  * to reduce the latency.  without this, the system will hang up
403  * during the whole loop.
404  */
405 #define CHECK_SCHEDULER() \
406 do { \
407         cond_resched();\
408         if (signal_pending(current))\
409                 return -EAGAIN;\
410 } while (0)
411 
412 enum {
413         COPY_USER, COPY_KERNEL, FILL_SILENCE,
414 };
415 
416 #define GET_VAL(sval, buf, mode)                                        \
417         do {                                                            \
418                 switch (mode) {                                         \
419                 case FILL_SILENCE:                                      \
420                         sval = 0;                                       \
421                         break;                                          \
422                 case COPY_KERNEL:                                       \
423                         sval = *buf++;                                  \
424                         break;                                          \
425                 default:                                                \
426                         if (get_user(sval, (unsigned short __user *)buf)) \
427                                 return -EFAULT;                         \
428                         buf++;                                          \
429                         break;                                          \
430                 }                                                       \
431         } while (0)
432 
433 #ifdef USE_NONINTERLEAVE
434 
435 #define LOOP_WRITE(rec, offset, _buf, count, mode)              \
436         do {                                                    \
437                 struct snd_emu8000 *emu = (rec)->emu;           \
438                 unsigned short *buf = (unsigned short *)(_buf); \
439                 snd_emu8000_write_wait(emu, 1);                 \
440                 EMU8000_SMALW_WRITE(emu, offset);               \
441                 while (count > 0) {                             \
442                         unsigned short sval;                    \
443                         CHECK_SCHEDULER();                      \
444                         GET_VAL(sval, buf, mode);               \
445                         EMU8000_SMLD_WRITE(emu, sval);          \
446                         count--;                                \
447                 }                                               \
448         } while (0)
449 
450 /* copy one channel block */
451 static int emu8k_pcm_copy(struct snd_pcm_substream *subs,
452                           int voice, unsigned long pos,
453                           void __user *src, unsigned long count)
454 {
455         struct snd_emu8k_pcm *rec = subs->runtime->private_data;
456 
457         /* convert to word unit */
458         pos = (pos << 1) + rec->loop_start[voice];
459         count <<= 1;
460         LOOP_WRITE(rec, pos, src, count, COPY_USER);
461         return 0;
462 }
463 
464 static int emu8k_pcm_copy_kernel(struct snd_pcm_substream *subs,
465                                  int voice, unsigned long pos,
466                                  void *src, unsigned long count)
467 {
468         struct snd_emu8k_pcm *rec = subs->runtime->private_data;
469 
470         /* convert to word unit */
471         pos = (pos << 1) + rec->loop_start[voice];
472         count <<= 1;
473         LOOP_WRITE(rec, pos, src, count, COPY_KERNEL);
474         return 0;
475 }
476 
477 /* make a channel block silence */
478 static int emu8k_pcm_silence(struct snd_pcm_substream *subs,
479                              int voice, unsigned long pos, unsigned long count)
480 {
481         struct snd_emu8k_pcm *rec = subs->runtime->private_data;
482 
483         /* convert to word unit */
484         pos = (pos << 1) + rec->loop_start[voice];
485         count <<= 1;
486         LOOP_WRITE(rec, pos, NULL, count, FILL_SILENCE);
487         return 0;
488 }
489 
490 #else /* interleave */
491 
492 #define LOOP_WRITE(rec, pos, _buf, count, mode)                         \
493         do {                                                            \
494                 struct snd_emu8000 *emu = rec->emu;                     \
495                 unsigned short *buf = (unsigned short *)(_buf);         \
496                 snd_emu8000_write_wait(emu, 1);                         \
497                 EMU8000_SMALW_WRITE(emu, pos + rec->loop_start[0]);     \
498                 if (rec->voices > 1)                                    \
499                         EMU8000_SMARW_WRITE(emu, pos + rec->loop_start[1]); \
500                 while (count > 0) {                                     \
501                         unsigned short sval;                            \
502                         CHECK_SCHEDULER();                              \
503                         GET_VAL(sval, buf, mode);                       \
504                         EMU8000_SMLD_WRITE(emu, sval);                  \
505                         if (rec->voices > 1) {                          \
506                                 CHECK_SCHEDULER();                      \
507                                 GET_VAL(sval, buf, mode);               \
508                                 EMU8000_SMRD_WRITE(emu, sval);          \
509                         }                                               \
510                         count--;                                        \
511                 }                                                       \
512         } while (0)
513 
514 
515 /*
516  * copy the interleaved data can be done easily by using
517  * DMA "left" and "right" channels on emu8k engine.
518  */
519 static int emu8k_pcm_copy(struct snd_pcm_substream *subs,
520                           int voice, unsigned long pos,
521                           void __user *src, unsigned long count)
522 {
523         struct snd_emu8k_pcm *rec = subs->runtime->private_data;
524 
525         /* convert to frames */
526         pos = bytes_to_frames(subs->runtime, pos);
527         count = bytes_to_frames(subs->runtime, count);
528         LOOP_WRITE(rec, pos, src, count, COPY_USER);
529         return 0;
530 }
531 
532 static int emu8k_pcm_copy_kernel(struct snd_pcm_substream *subs,
533                                  int voice, unsigned long pos,
534                                  void *src, unsigned long count)
535 {
536         struct snd_emu8k_pcm *rec = subs->runtime->private_data;
537 
538         /* convert to frames */
539         pos = bytes_to_frames(subs->runtime, pos);
540         count = bytes_to_frames(subs->runtime, count);
541         LOOP_WRITE(rec, pos, src, count, COPY_KERNEL);
542         return 0;
543 }
544 
545 static int emu8k_pcm_silence(struct snd_pcm_substream *subs,
546                              int voice, unsigned long pos, unsigned long count)
547 {
548         struct snd_emu8k_pcm *rec = subs->runtime->private_data;
549 
550         /* convert to frames */
551         pos = bytes_to_frames(subs->runtime, pos);
552         count = bytes_to_frames(subs->runtime, count);
553         LOOP_WRITE(rec, pos, NULL, count, FILL_SILENCE);
554         return 0;
555 }
556 #endif
557 
558 
559 /*
560  * allocate a memory block
561  */
562 static int emu8k_pcm_hw_params(struct snd_pcm_substream *subs,
563                                struct snd_pcm_hw_params *hw_params)
564 {
565         struct snd_emu8k_pcm *rec = subs->runtime->private_data;
566 
567         if (rec->block) {
568                 /* reallocation - release the old block */
569                 snd_util_mem_free(rec->emu->memhdr, rec->block);
570                 rec->block = NULL;
571         }
572 
573         rec->allocated_bytes = params_buffer_bytes(hw_params) + LOOP_BLANK_SIZE * 4;
574         rec->block = snd_util_mem_alloc(rec->emu->memhdr, rec->allocated_bytes);
575         if (! rec->block)
576                 return -ENOMEM;
577         rec->offset = EMU8000_DRAM_OFFSET + (rec->block->offset >> 1); /* in word */
578         /* at least dma_bytes must be set for non-interleaved mode */
579         subs->dma_buffer.bytes = params_buffer_bytes(hw_params);
580 
581         return 0;
582 }
583 
584 /*
585  * free the memory block
586  */
587 static int emu8k_pcm_hw_free(struct snd_pcm_substream *subs)
588 {
589         struct snd_emu8k_pcm *rec = subs->runtime->private_data;
590 
591         if (rec->block) {
592                 int ch;
593                 for (ch = 0; ch < rec->voices; ch++)
594                         stop_voice(rec, ch); // to be sure
595                 if (rec->dram_opened)
596                         emu8k_close_dram(rec->emu);
597                 snd_util_mem_free(rec->emu->memhdr, rec->block);
598                 rec->block = NULL;
599         }
600         return 0;
601 }
602 
603 /*
604  */
605 static int emu8k_pcm_prepare(struct snd_pcm_substream *subs)
606 {
607         struct snd_emu8k_pcm *rec = subs->runtime->private_data;
608 
609         rec->pitch = 0xe000 + calc_rate_offset(subs->runtime->rate);
610         rec->last_ptr = 0;
611         rec->period_pos = 0;
612 
613         rec->buf_size = subs->runtime->buffer_size;
614         rec->period_size = subs->runtime->period_size;
615         rec->voices = subs->runtime->channels;
616         rec->loop_start[0] = rec->offset + LOOP_BLANK_SIZE;
617         if (rec->voices > 1)
618                 rec->loop_start[1] = rec->loop_start[0] + rec->buf_size + LOOP_BLANK_SIZE;
619         if (rec->voices > 1) {
620                 rec->panning[0] = 0xff;
621                 rec->panning[1] = 0x00;
622         } else
623                 rec->panning[0] = 0x80;
624 
625         if (! rec->dram_opened) {
626                 int err, i, ch;
627 
628                 snd_emux_terminate_all(rec->emu->emu);
629                 if ((err = emu8k_open_dram_for_pcm(rec->emu, rec->voices)) != 0)
630                         return err;
631                 rec->dram_opened = 1;
632 
633                 /* clear loop blanks */
634                 snd_emu8000_write_wait(rec->emu, 0);
635                 EMU8000_SMALW_WRITE(rec->emu, rec->offset);
636                 for (i = 0; i < LOOP_BLANK_SIZE; i++)
637                         EMU8000_SMLD_WRITE(rec->emu, 0);
638                 for (ch = 0; ch < rec->voices; ch++) {
639                         EMU8000_SMALW_WRITE(rec->emu, rec->loop_start[ch] + rec->buf_size);
640                         for (i = 0; i < LOOP_BLANK_SIZE; i++)
641                                 EMU8000_SMLD_WRITE(rec->emu, 0);
642                 }
643         }
644 
645         setup_voice(rec, 0);
646         if (rec->voices > 1)
647                 setup_voice(rec, 1);
648         return 0;
649 }
650 
651 static snd_pcm_uframes_t emu8k_pcm_pointer(struct snd_pcm_substream *subs)
652 {
653         struct snd_emu8k_pcm *rec = subs->runtime->private_data;
654         if (rec->running)
655                 return emu8k_get_curpos(rec, 0);
656         return 0;
657 }
658 
659 
660 static const struct snd_pcm_ops emu8k_pcm_ops = {
661         .open =         emu8k_pcm_open,
662         .close =        emu8k_pcm_close,
663         .ioctl =        snd_pcm_lib_ioctl,
664         .hw_params =    emu8k_pcm_hw_params,
665         .hw_free =      emu8k_pcm_hw_free,
666         .prepare =      emu8k_pcm_prepare,
667         .trigger =      emu8k_pcm_trigger,
668         .pointer =      emu8k_pcm_pointer,
669         .copy_user =    emu8k_pcm_copy,
670         .copy_kernel =  emu8k_pcm_copy_kernel,
671         .fill_silence = emu8k_pcm_silence,
672 };
673 
674 
675 static void snd_emu8000_pcm_free(struct snd_pcm *pcm)
676 {
677         struct snd_emu8000 *emu = pcm->private_data;
678         emu->pcm = NULL;
679 }
680 
681 int snd_emu8000_pcm_new(struct snd_card *card, struct snd_emu8000 *emu, int index)
682 {
683         struct snd_pcm *pcm;
684         int err;
685 
686         if ((err = snd_pcm_new(card, "Emu8000 PCM", index, 1, 0, &pcm)) < 0)
687                 return err;
688         pcm->private_data = emu;
689         pcm->private_free = snd_emu8000_pcm_free;
690         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &emu8k_pcm_ops);
691         emu->pcm = pcm;
692 
693         snd_device_register(card, pcm);
694 
695         return 0;
696 }
697 

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