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Merge tag 'rdma-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland...
[mirror_ubuntu-artful-kernel.git] / sound / isa / sb / emu8000_pcm.c
CommitLineData
1da177e4
LT		 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>
5a0e3ad6 23#include <linux/slab.h>
1da177e4
LT		 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
1da177e4 50struct snd_emu8k_pcm {
029d64b0
TI		 51 struct snd_emu8000 *emu;
52 struct snd_pcm_substream *substream;
1da177e4
LT		 53
54 unsigned int allocated_bytes;
029d64b0 55 struct snd_util_memblk *block;
1da177e4
LT		 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 */
78static int
029d64b0 79emu8k_open_dram_for_pcm(struct snd_emu8000 *emu, int channels)
1da177e4
LT		 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 */
114static void
029d64b0 115snd_emu8000_write_wait(struct snd_emu8000 *emu, int can_schedule)
1da177e4
LT		 116{
117 while ((EMU8000_SMALW_READ(emu) & 0x80000000) != 0) {
118 if (can_schedule) {
8433a509 119 schedule_timeout_interruptible(1);
1da177e4
LT		 120 if (signal_pending(current))
121 break;
122 }
123 }
124}
125
126/*
127 * close all channels
128 */
129static void
029d64b0 130emu8k_close_dram(struct snd_emu8000 *emu)
1da177e4
LT		 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
149static 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
029d64b0 158static struct snd_pcm_hardware emu8k_pcm_hw = {
1da177e4
LT		 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 */
029d64b0 182static inline int emu8k_get_curpos(struct snd_emu8k_pcm *rec, int ch)
1da177e4
LT		 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 */
194static void emu8k_pcm_timer_func(unsigned long data)
195{
029d64b0 196 struct snd_emu8k_pcm *rec = (struct snd_emu8k_pcm *)data;
1da177e4
LT		 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 */
f05b4127 210 mod_timer(&rec->timer, jiffies + 1);
1da177e4
LT		 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 */
029d64b0 227static int emu8k_pcm_open(struct snd_pcm_substream *subs)
1da177e4 228{
029d64b0
TI		 229 struct snd_emu8000 *emu = snd_pcm_substream_chip(subs);
230 struct snd_emu8k_pcm *rec;
231 struct snd_pcm_runtime *runtime = subs->runtime;
1da177e4 232
9e76a76e 233 rec = kzalloc(sizeof(*rec), GFP_KERNEL);
1da177e4
LT		 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);
f05b4127 242 setup_timer(&rec->timer, emu8k_pcm_timer_func, (unsigned long)rec);
1da177e4
LT		 243
244 runtime->hw = emu8k_pcm_hw;
245 runtime->hw.buffer_bytes_max = emu->mem_size - LOOP_BLANK_SIZE * 3;
246 runtime->hw.period_bytes_max = runtime->hw.buffer_bytes_max / 2;
247
248 /* use timer to update periods.. (specified in msec) */
249 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
250 (1000000 + HZ - 1) / HZ, UINT_MAX);
251
252 return 0;
253}
254
029d64b0 255static int emu8k_pcm_close(struct snd_pcm_substream *subs)
1da177e4 256{
029d64b0 257 struct snd_emu8k_pcm *rec = subs->runtime->private_data;
1da177e4
LT		 258 kfree(rec);
259 subs->runtime->private_data = NULL;
260 return 0;
261}
262
263/*
264 * calculate pitch target
265 */
266static int calc_pitch_target(int pitch)
267{
268 int ptarget = 1 << (pitch >> 12);
269 if (pitch & 0x800) ptarget += (ptarget * 0x102e) / 0x2710;
270 if (pitch & 0x400) ptarget += (ptarget * 0x764) / 0x2710;
271 if (pitch & 0x200) ptarget += (ptarget * 0x389) / 0x2710;
272 ptarget += (ptarget >> 1);
273 if (ptarget > 0xffff) ptarget = 0xffff;
274 return ptarget;
275}
276
277/*
278 * set up the voice
279 */
029d64b0 280static void setup_voice(struct snd_emu8k_pcm *rec, int ch)
1da177e4 281{
029d64b0 282 struct snd_emu8000 *hw = rec->emu;
1da177e4
LT		 283 unsigned int temp;
284
285 /* channel to be silent and idle */
286 EMU8000_DCYSUSV_WRITE(hw, ch, 0x0080);
287 EMU8000_VTFT_WRITE(hw, ch, 0x0000FFFF);
288 EMU8000_CVCF_WRITE(hw, ch, 0x0000FFFF);
289 EMU8000_PTRX_WRITE(hw, ch, 0);
290 EMU8000_CPF_WRITE(hw, ch, 0);
291
292 /* pitch offset */
293 EMU8000_IP_WRITE(hw, ch, rec->pitch);
294 /* set envelope parameters */
295 EMU8000_ENVVAL_WRITE(hw, ch, 0x8000);
296 EMU8000_ATKHLD_WRITE(hw, ch, 0x7f7f);
297 EMU8000_DCYSUS_WRITE(hw, ch, 0x7f7f);
298 EMU8000_ENVVOL_WRITE(hw, ch, 0x8000);
299 EMU8000_ATKHLDV_WRITE(hw, ch, 0x7f7f);
300 /* decay/sustain parameter for volume envelope is used
301 for triggerg the voice */
302 /* modulation envelope heights */
303 EMU8000_PEFE_WRITE(hw, ch, 0x0);
304 /* lfo1/2 delay */
305 EMU8000_LFO1VAL_WRITE(hw, ch, 0x8000);
306 EMU8000_LFO2VAL_WRITE(hw, ch, 0x8000);
307 /* lfo1 pitch & cutoff shift */
308 EMU8000_FMMOD_WRITE(hw, ch, 0);
309 /* lfo1 volume & freq */
310 EMU8000_TREMFRQ_WRITE(hw, ch, 0);
311 /* lfo2 pitch & freq */
312 EMU8000_FM2FRQ2_WRITE(hw, ch, 0);
313 /* pan & loop start */
314 temp = rec->panning[ch];
315 temp = (temp <<24) | ((unsigned int)rec->loop_start[ch] - 1);
316 EMU8000_PSST_WRITE(hw, ch, temp);
317 /* chorus & loop end (chorus 8bit, MSB) */
318 temp = 0; // chorus
319 temp = (temp << 24) | ((unsigned int)rec->loop_start[ch] + rec->buf_size - 1);
320 EMU8000_CSL_WRITE(hw, ch, temp);
321 /* Q & current address (Q 4bit value, MSB) */
322 temp = 0; // filterQ
323 temp = (temp << 28) | ((unsigned int)rec->loop_start[ch] - 1);
324 EMU8000_CCCA_WRITE(hw, ch, temp);
325 /* clear unknown registers */
326 EMU8000_00A0_WRITE(hw, ch, 0);
327 EMU8000_0080_WRITE(hw, ch, 0);
328}
329
330/*
331 * trigger the voice
332 */
029d64b0 333static void start_voice(struct snd_emu8k_pcm *rec, int ch)
1da177e4
LT		 334{
335 unsigned long flags;
029d64b0 336 struct snd_emu8000 *hw = rec->emu;
1da177e4
LT		 337 unsigned int temp, aux;
338 int pt = calc_pitch_target(rec->pitch);
339
340 /* cutoff and volume */
341 EMU8000_IFATN_WRITE(hw, ch, 0xff00);
342 EMU8000_VTFT_WRITE(hw, ch, 0xffff);
343 EMU8000_CVCF_WRITE(hw, ch, 0xffff);
344 /* trigger envelope */
345 EMU8000_DCYSUSV_WRITE(hw, ch, 0x7f7f);
346 /* set reverb and pitch target */
347 temp = 0; // reverb
348 if (rec->panning[ch] == 0)
349 aux = 0xff;
350 else
351 aux = (-rec->panning[ch]) & 0xff;
352 temp = (temp << 8) | (pt << 16) | aux;
353 EMU8000_PTRX_WRITE(hw, ch, temp);
354 EMU8000_CPF_WRITE(hw, ch, pt << 16);
355
356 /* start timer */
357 spin_lock_irqsave(&rec->timer_lock, flags);
358 if (! rec->timer_running) {
f05b4127 359 mod_timer(&rec->timer, jiffies + 1);
1da177e4
LT		 360 rec->timer_running = 1;
361 }
362 spin_unlock_irqrestore(&rec->timer_lock, flags);
363}
364
365/*
366 * stop the voice immediately
367 */
029d64b0 368static void stop_voice(struct snd_emu8k_pcm *rec, int ch)
1da177e4
LT		 369{
370 unsigned long flags;
029d64b0 371 struct snd_emu8000 *hw = rec->emu;
1da177e4
LT		 372
373 EMU8000_DCYSUSV_WRITE(hw, ch, 0x807F);
374
375 /* stop timer */
376 spin_lock_irqsave(&rec->timer_lock, flags);
377 if (rec->timer_running) {
378 del_timer(&rec->timer);
379 rec->timer_running = 0;
380 }
381 spin_unlock_irqrestore(&rec->timer_lock, flags);
382}
383
029d64b0 384static int emu8k_pcm_trigger(struct snd_pcm_substream *subs, int cmd)
1da177e4 385{
029d64b0 386 struct snd_emu8k_pcm *rec = subs->runtime->private_data;
1da177e4
LT		 387 int ch;
388
389 switch (cmd) {
390 case SNDRV_PCM_TRIGGER_START:
391 for (ch = 0; ch < rec->voices; ch++)
392 start_voice(rec, ch);
393 rec->running = 1;
394 break;
395 case SNDRV_PCM_TRIGGER_STOP:
396 rec->running = 0;
397 for (ch = 0; ch < rec->voices; ch++)
398 stop_voice(rec, ch);
399 break;
400 default:
401 return -EINVAL;
402 }
403 return 0;
404}
405
406
407/*
408 * copy / silence ops
409 */
410
411/*
412 * this macro should be inserted in the copy/silence loops
413 * to reduce the latency. without this, the system will hang up
414 * during the whole loop.
415 */
416#define CHECK_SCHEDULER() \
417do { \
418 cond_resched();\
419 if (signal_pending(current))\
420 return -EAGAIN;\
421} while (0)
422
423
424#ifdef USE_NONINTERLEAVE
425/* copy one channel block */
029d64b0 426static int emu8k_transfer_block(struct snd_emu8000 *emu, int offset, unsigned short *buf, int count)
1da177e4
LT		 427{
428 EMU8000_SMALW_WRITE(emu, offset);
429 while (count > 0) {
430 unsigned short sval;
431 CHECK_SCHEDULER();
5157cc81
KV		 432 if (get_user(sval, buf))
433 return -EFAULT;
1da177e4
LT		 434 EMU8000_SMLD_WRITE(emu, sval);
435 buf++;
436 count--;
437 }
438 return 0;
439}
440
029d64b0 441static int emu8k_pcm_copy(struct snd_pcm_substream *subs,
1da177e4
LT		 442 int voice,
443 snd_pcm_uframes_t pos,
444 void *src,
445 snd_pcm_uframes_t count)
446{
029d64b0
TI		 447 struct snd_emu8k_pcm *rec = subs->runtime->private_data;
448 struct snd_emu8000 *emu = rec->emu;
1da177e4
LT		 449
450 snd_emu8000_write_wait(emu, 1);
451 if (voice == -1) {
452 unsigned short *buf = src;
453 int i, err;
454 count /= rec->voices;
455 for (i = 0; i < rec->voices; i++) {
456 err = emu8k_transfer_block(emu, pos + rec->loop_start[i], buf, count);
457 if (err < 0)
458 return err;
459 buf += count;
460 }
461 return 0;
462 } else {
463 return emu8k_transfer_block(emu, pos + rec->loop_start[voice], src, count);
464 }
465}
466
467/* make a channel block silence */
029d64b0 468static int emu8k_silence_block(struct snd_emu8000 *emu, int offset, int count)
1da177e4
LT		 469{
470 EMU8000_SMALW_WRITE(emu, offset);
471 while (count > 0) {
472 CHECK_SCHEDULER();
473 EMU8000_SMLD_WRITE(emu, 0);
474 count--;
475 }
476 return 0;
477}
478
029d64b0 479static int emu8k_pcm_silence(struct snd_pcm_substream *subs,
1da177e4
LT		 480 int voice,
481 snd_pcm_uframes_t pos,
482 snd_pcm_uframes_t count)
483{
029d64b0
TI		 484 struct snd_emu8k_pcm *rec = subs->runtime->private_data;
485 struct snd_emu8000 *emu = rec->emu;
1da177e4
LT		 486
487 snd_emu8000_write_wait(emu, 1);
488 if (voice == -1 && rec->voices == 1)
489 voice = 0;
490 if (voice == -1) {
491 int err;
492 err = emu8k_silence_block(emu, pos + rec->loop_start[0], count / 2);
493 if (err < 0)
494 return err;
495 return emu8k_silence_block(emu, pos + rec->loop_start[1], count / 2);
496 } else {
497 return emu8k_silence_block(emu, pos + rec->loop_start[voice], count);
498 }
499}
500
501#else /* interleave */
502
503/*
504 * copy the interleaved data can be done easily by using
505 * DMA "left" and "right" channels on emu8k engine.
506 */
029d64b0 507static int emu8k_pcm_copy(struct snd_pcm_substream *subs,
1da177e4
LT		 508 int voice,
509 snd_pcm_uframes_t pos,
510 void __user *src,
511 snd_pcm_uframes_t count)
512{
029d64b0
TI		 513 struct snd_emu8k_pcm *rec = subs->runtime->private_data;
514 struct snd_emu8000 *emu = rec->emu;
1da177e4
LT		 515 unsigned short __user *buf = src;
516
517 snd_emu8000_write_wait(emu, 1);
518 EMU8000_SMALW_WRITE(emu, pos + rec->loop_start[0]);
519 if (rec->voices > 1)
520 EMU8000_SMARW_WRITE(emu, pos + rec->loop_start[1]);
521
522 while (count-- > 0) {
523 unsigned short sval;
524 CHECK_SCHEDULER();
5157cc81
KV		 525 if (get_user(sval, buf))
526 return -EFAULT;
1da177e4
LT		 527 EMU8000_SMLD_WRITE(emu, sval);
528 buf++;
529 if (rec->voices > 1) {
530 CHECK_SCHEDULER();
5157cc81
KV		 531 if (get_user(sval, buf))
532 return -EFAULT;
1da177e4
LT		 533 EMU8000_SMRD_WRITE(emu, sval);
534 buf++;
535 }
536 }
537 return 0;
538}
539
029d64b0 540static int emu8k_pcm_silence(struct snd_pcm_substream *subs,
1da177e4
LT		 541 int voice,
542 snd_pcm_uframes_t pos,
543 snd_pcm_uframes_t count)
544{
029d64b0
TI		 545 struct snd_emu8k_pcm *rec = subs->runtime->private_data;
546 struct snd_emu8000 *emu = rec->emu;
1da177e4
LT		 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 */
029d64b0
TI		 568static int emu8k_pcm_hw_params(struct snd_pcm_substream *subs,
569 struct snd_pcm_hw_params *hw_params)
1da177e4 570{
029d64b0 571 struct snd_emu8k_pcm *rec = subs->runtime->private_data;
1da177e4
LT		 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 */
029d64b0 593static int emu8k_pcm_hw_free(struct snd_pcm_substream *subs)
1da177e4 594{
029d64b0 595 struct snd_emu8k_pcm *rec = subs->runtime->private_data;
1da177e4
LT		 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 */
029d64b0 611static int emu8k_pcm_prepare(struct snd_pcm_substream *subs)
1da177e4 612{
029d64b0 613 struct snd_emu8k_pcm *rec = subs->runtime->private_data;
1da177e4
LT		 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
029d64b0 657static snd_pcm_uframes_t emu8k_pcm_pointer(struct snd_pcm_substream *subs)
1da177e4 658{
029d64b0 659 struct snd_emu8k_pcm *rec = subs->runtime->private_data;
1da177e4
LT		 660 if (rec->running)
661 return emu8k_get_curpos(rec, 0);
662 return 0;
663}
664
665
029d64b0 666static struct snd_pcm_ops emu8k_pcm_ops = {
1da177e4
LT		 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
029d64b0 680static void snd_emu8000_pcm_free(struct snd_pcm *pcm)
1da177e4 681{
029d64b0 682 struct snd_emu8000 *emu = pcm->private_data;
1da177e4
LT		 683 emu->pcm = NULL;
684}
685
029d64b0 686int snd_emu8000_pcm_new(struct snd_card *card, struct snd_emu8000 *emu, int index)
1da177e4 687{
029d64b0 688 struct snd_pcm *pcm;
1da177e4
LT		 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}
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