projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge master.kernel.org:/home/rmk/linux-2.6-mmc
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / 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 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 schedule_timeout_interruptible(1);
121 if (signal_pending(current))
122 break;
123 }
124 }
125 }
126
127 /*
128 * close all channels
129 */
130 static void
131 emu8k_close_dram(emu8000_t *emu)
132 {
133 int i;
134
135 for (i = 0; i < 2; i++)
136 snd_emux_unlock_voice(emu->emu, i);
137 for (; i < EMU8000_DRAM_VOICES; i++) {
138 snd_emu8000_dma_chan(emu, i, EMU8000_RAM_CLOSE);
139 snd_emux_unlock_voice(emu->emu, i);
140 }
141 }
142
143 /*
144 * convert Hz to AWE32 rate offset (see emux/soundfont.c)
145 */
146
147 #define OFFSET_SAMPLERATE 1011119 /* base = 44100 */
148 #define SAMPLERATE_RATIO 4096
149
150 static int calc_rate_offset(int hz)
151 {
152 return snd_sf_linear_to_log(hz, OFFSET_SAMPLERATE, SAMPLERATE_RATIO);
153 }
154
155
156 /*
157 */
158
159 static snd_pcm_hardware_t emu8k_pcm_hw = {
160 #ifdef USE_NONINTERLEAVE
161 .info = SNDRV_PCM_INFO_NONINTERLEAVED,
162 #else
163 .info = SNDRV_PCM_INFO_INTERLEAVED,
164 #endif
165 .formats = SNDRV_PCM_FMTBIT_S16_LE,
166 .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
167 .rate_min = 4000,
168 .rate_max = 48000,
169 .channels_min = 1,
170 .channels_max = 2,
171 .buffer_bytes_max = (128*1024),
172 .period_bytes_min = 1024,
173 .period_bytes_max = (128*1024),
174 .periods_min = 2,
175 .periods_max = 1024,
176 .fifo_size = 0,
177
178 };
179
180 /*
181 * get the current position at the given channel from CCCA register
182 */
183 static inline int emu8k_get_curpos(emu8k_pcm_t *rec, int ch)
184 {
185 int val = EMU8000_CCCA_READ(rec->emu, ch) & 0xfffffff;
186 val -= rec->loop_start[ch] - 1;
187 return val;
188 }
189
190
191 /*
192 * timer interrupt handler
193 * check the current position and update the period if necessary.
194 */
195 static void emu8k_pcm_timer_func(unsigned long data)
196 {
197 emu8k_pcm_t *rec = (emu8k_pcm_t *)data;
198 int ptr, delta;
199
200 spin_lock(&rec->timer_lock);
201 /* update the current pointer */
202 ptr = emu8k_get_curpos(rec, 0);
203 if (ptr < rec->last_ptr)
204 delta = ptr + rec->buf_size - rec->last_ptr;
205 else
206 delta = ptr - rec->last_ptr;
207 rec->period_pos += delta;
208 rec->last_ptr = ptr;
209
210 /* reprogram timer */
211 rec->timer.expires = jiffies + 1;
212 add_timer(&rec->timer);
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(snd_pcm_substream_t *subs)
230 {
231 emu8000_t *emu = snd_pcm_substream_chip(subs);
232 emu8k_pcm_t *rec;
233 snd_pcm_runtime_t *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 init_timer(&rec->timer);
245 rec->timer.function = emu8k_pcm_timer_func;
246 rec->timer.data = (unsigned long)rec;
247
248 runtime->hw = emu8k_pcm_hw;
249 runtime->hw.buffer_bytes_max = emu->mem_size - LOOP_BLANK_SIZE * 3;
250 runtime->hw.period_bytes_max = runtime->hw.buffer_bytes_max / 2;
251
252 /* use timer to update periods.. (specified in msec) */
253 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
254 (1000000 + HZ - 1) / HZ, UINT_MAX);
255
256 return 0;
257 }
258
259 static int emu8k_pcm_close(snd_pcm_substream_t *subs)
260 {
261 emu8k_pcm_t *rec = subs->runtime->private_data;
262 kfree(rec);
263 subs->runtime->private_data = NULL;
264 return 0;
265 }
266
267 /*
268 * calculate pitch target
269 */
270 static int calc_pitch_target(int pitch)
271 {
272 int ptarget = 1 << (pitch >> 12);
273 if (pitch & 0x800) ptarget += (ptarget * 0x102e) / 0x2710;
274 if (pitch & 0x400) ptarget += (ptarget * 0x764) / 0x2710;
275 if (pitch & 0x200) ptarget += (ptarget * 0x389) / 0x2710;
276 ptarget += (ptarget >> 1);
277 if (ptarget > 0xffff) ptarget = 0xffff;
278 return ptarget;
279 }
280
281 /*
282 * set up the voice
283 */
284 static void setup_voice(emu8k_pcm_t *rec, int ch)
285 {
286 emu8000_t *hw = rec->emu;
287 unsigned int temp;
288
289 /* channel to be silent and idle */
290 EMU8000_DCYSUSV_WRITE(hw, ch, 0x0080);
291 EMU8000_VTFT_WRITE(hw, ch, 0x0000FFFF);
292 EMU8000_CVCF_WRITE(hw, ch, 0x0000FFFF);
293 EMU8000_PTRX_WRITE(hw, ch, 0);
294 EMU8000_CPF_WRITE(hw, ch, 0);
295
296 /* pitch offset */
297 EMU8000_IP_WRITE(hw, ch, rec->pitch);
298 /* set envelope parameters */
299 EMU8000_ENVVAL_WRITE(hw, ch, 0x8000);
300 EMU8000_ATKHLD_WRITE(hw, ch, 0x7f7f);
301 EMU8000_DCYSUS_WRITE(hw, ch, 0x7f7f);
302 EMU8000_ENVVOL_WRITE(hw, ch, 0x8000);
303 EMU8000_ATKHLDV_WRITE(hw, ch, 0x7f7f);
304 /* decay/sustain parameter for volume envelope is used
305 for triggerg the voice */
306 /* modulation envelope heights */
307 EMU8000_PEFE_WRITE(hw, ch, 0x0);
308 /* lfo1/2 delay */
309 EMU8000_LFO1VAL_WRITE(hw, ch, 0x8000);
310 EMU8000_LFO2VAL_WRITE(hw, ch, 0x8000);
311 /* lfo1 pitch & cutoff shift */
312 EMU8000_FMMOD_WRITE(hw, ch, 0);
313 /* lfo1 volume & freq */
314 EMU8000_TREMFRQ_WRITE(hw, ch, 0);
315 /* lfo2 pitch & freq */
316 EMU8000_FM2FRQ2_WRITE(hw, ch, 0);
317 /* pan & loop start */
318 temp = rec->panning[ch];
319 temp = (temp <<24) | ((unsigned int)rec->loop_start[ch] - 1);
320 EMU8000_PSST_WRITE(hw, ch, temp);
321 /* chorus & loop end (chorus 8bit, MSB) */
322 temp = 0; // chorus
323 temp = (temp << 24) | ((unsigned int)rec->loop_start[ch] + rec->buf_size - 1);
324 EMU8000_CSL_WRITE(hw, ch, temp);
325 /* Q & current address (Q 4bit value, MSB) */
326 temp = 0; // filterQ
327 temp = (temp << 28) | ((unsigned int)rec->loop_start[ch] - 1);
328 EMU8000_CCCA_WRITE(hw, ch, temp);
329 /* clear unknown registers */
330 EMU8000_00A0_WRITE(hw, ch, 0);
331 EMU8000_0080_WRITE(hw, ch, 0);
332 }
333
334 /*
335 * trigger the voice
336 */
337 static void start_voice(emu8k_pcm_t *rec, int ch)
338 {
339 unsigned long flags;
340 emu8000_t *hw = rec->emu;
341 unsigned int temp, aux;
342 int pt = calc_pitch_target(rec->pitch);
343
344 /* cutoff and volume */
345 EMU8000_IFATN_WRITE(hw, ch, 0xff00);
346 EMU8000_VTFT_WRITE(hw, ch, 0xffff);
347 EMU8000_CVCF_WRITE(hw, ch, 0xffff);
348 /* trigger envelope */
349 EMU8000_DCYSUSV_WRITE(hw, ch, 0x7f7f);
350 /* set reverb and pitch target */
351 temp = 0; // reverb
352 if (rec->panning[ch] == 0)
353 aux = 0xff;
354 else
355 aux = (-rec->panning[ch]) & 0xff;
356 temp = (temp << 8) | (pt << 16) | aux;
357 EMU8000_PTRX_WRITE(hw, ch, temp);
358 EMU8000_CPF_WRITE(hw, ch, pt << 16);
359
360 /* start timer */
361 spin_lock_irqsave(&rec->timer_lock, flags);
362 if (! rec->timer_running) {
363 rec->timer.expires = jiffies + 1;
364 add_timer(&rec->timer);
365 rec->timer_running = 1;
366 }
367 spin_unlock_irqrestore(&rec->timer_lock, flags);
368 }
369
370 /*
371 * stop the voice immediately
372 */
373 static void stop_voice(emu8k_pcm_t *rec, int ch)
374 {
375 unsigned long flags;
376 emu8000_t *hw = rec->emu;
377
378 EMU8000_DCYSUSV_WRITE(hw, ch, 0x807F);
379
380 /* stop timer */
381 spin_lock_irqsave(&rec->timer_lock, flags);
382 if (rec->timer_running) {
383 del_timer(&rec->timer);
384 rec->timer_running = 0;
385 }
386 spin_unlock_irqrestore(&rec->timer_lock, flags);
387 }
388
389 static int emu8k_pcm_trigger(snd_pcm_substream_t *subs, int cmd)
390 {
391 emu8k_pcm_t *rec = subs->runtime->private_data;
392 int ch;
393
394 switch (cmd) {
395 case SNDRV_PCM_TRIGGER_START:
396 for (ch = 0; ch < rec->voices; ch++)
397 start_voice(rec, ch);
398 rec->running = 1;
399 break;
400 case SNDRV_PCM_TRIGGER_STOP:
401 rec->running = 0;
402 for (ch = 0; ch < rec->voices; ch++)
403 stop_voice(rec, ch);
404 break;
405 default:
406 return -EINVAL;
407 }
408 return 0;
409 }
410
411
412 /*
413 * copy / silence ops
414 */
415
416 /*
417 * this macro should be inserted in the copy/silence loops
418 * to reduce the latency. without this, the system will hang up
419 * during the whole loop.
420 */
421 #define CHECK_SCHEDULER() \
422 do { \
423 cond_resched();\
424 if (signal_pending(current))\
425 return -EAGAIN;\
426 } while (0)
427
428
429 #ifdef USE_NONINTERLEAVE
430 /* copy one channel block */
431 static int emu8k_transfer_block(emu8000_t *emu, int offset, unsigned short *buf, int count)
432 {
433 EMU8000_SMALW_WRITE(emu, offset);
434 while (count > 0) {
435 unsigned short sval;
436 CHECK_SCHEDULER();
437 get_user(sval, buf);
438 EMU8000_SMLD_WRITE(emu, sval);
439 buf++;
440 count--;
441 }
442 return 0;
443 }
444
445 static int emu8k_pcm_copy(snd_pcm_substream_t *subs,
446 int voice,
447 snd_pcm_uframes_t pos,
448 void *src,
449 snd_pcm_uframes_t count)
450 {
451 emu8k_pcm_t *rec = subs->runtime->private_data;
452 emu8000_t *emu = rec->emu;
453
454 snd_emu8000_write_wait(emu, 1);
455 if (voice == -1) {
456 unsigned short *buf = src;
457 int i, err;
458 count /= rec->voices;
459 for (i = 0; i < rec->voices; i++) {
460 err = emu8k_transfer_block(emu, pos + rec->loop_start[i], buf, count);
461 if (err < 0)
462 return err;
463 buf += count;
464 }
465 return 0;
466 } else {
467 return emu8k_transfer_block(emu, pos + rec->loop_start[voice], src, count);
468 }
469 }
470
471 /* make a channel block silence */
472 static int emu8k_silence_block(emu8000_t *emu, int offset, int count)
473 {
474 EMU8000_SMALW_WRITE(emu, offset);
475 while (count > 0) {
476 CHECK_SCHEDULER();
477 EMU8000_SMLD_WRITE(emu, 0);
478 count--;
479 }
480 return 0;
481 }
482
483 static int emu8k_pcm_silence(snd_pcm_substream_t *subs,
484 int voice,
485 snd_pcm_uframes_t pos,
486 snd_pcm_uframes_t count)
487 {
488 emu8k_pcm_t *rec = subs->runtime->private_data;
489 emu8000_t *emu = rec->emu;
490
491 snd_emu8000_write_wait(emu, 1);
492 if (voice == -1 && rec->voices == 1)
493 voice = 0;
494 if (voice == -1) {
495 int err;
496 err = emu8k_silence_block(emu, pos + rec->loop_start[0], count / 2);
497 if (err < 0)
498 return err;
499 return emu8k_silence_block(emu, pos + rec->loop_start[1], count / 2);
500 } else {
501 return emu8k_silence_block(emu, pos + rec->loop_start[voice], count);
502 }
503 }
504
505 #else /* interleave */
506
507 /*
508 * copy the interleaved data can be done easily by using
509 * DMA "left" and "right" channels on emu8k engine.
510 */
511 static int emu8k_pcm_copy(snd_pcm_substream_t *subs,
512 int voice,
513 snd_pcm_uframes_t pos,
514 void __user *src,
515 snd_pcm_uframes_t count)
516 {
517 emu8k_pcm_t *rec = subs->runtime->private_data;
518 emu8000_t *emu = rec->emu;
519 unsigned short __user *buf = src;
520
521 snd_emu8000_write_wait(emu, 1);
522 EMU8000_SMALW_WRITE(emu, pos + rec->loop_start[0]);
523 if (rec->voices > 1)
524 EMU8000_SMARW_WRITE(emu, pos + rec->loop_start[1]);
525
526 while (count-- > 0) {
527 unsigned short sval;
528 CHECK_SCHEDULER();
529 get_user(sval, buf);
530 EMU8000_SMLD_WRITE(emu, sval);
531 buf++;
532 if (rec->voices > 1) {
533 CHECK_SCHEDULER();
534 get_user(sval, buf);
535 EMU8000_SMRD_WRITE(emu, sval);
536 buf++;
537 }
538 }
539 return 0;
540 }
541
542 static int emu8k_pcm_silence(snd_pcm_substream_t *subs,
543 int voice,
544 snd_pcm_uframes_t pos,
545 snd_pcm_uframes_t count)
546 {
547 emu8k_pcm_t *rec = subs->runtime->private_data;
548 emu8000_t *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(snd_pcm_substream_t *subs,
571 snd_pcm_hw_params_t *hw_params)
572 {
573 emu8k_pcm_t *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(snd_pcm_substream_t *subs)
596 {
597 emu8k_pcm_t *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(snd_pcm_substream_t *subs)
614 {
615 emu8k_pcm_t *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(snd_pcm_substream_t *subs)
660 {
661 emu8k_pcm_t *rec = subs->runtime->private_data;
662 if (rec->running)
663 return emu8k_get_curpos(rec, 0);
664 return 0;
665 }
666
667
668 static snd_pcm_ops_t 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(snd_pcm_t *pcm)
683 {
684 emu8000_t *emu = pcm->private_data;
685 emu->pcm = NULL;
686 }
687
688 int snd_emu8000_pcm_new(snd_card_t *card, emu8000_t *emu, int index)
689 {
690 snd_pcm_t *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 }
kernel source for telekom puls (alcatel/mediatek)