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Linux-2.6.12-rc2
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / sound / oss / emu10k1 / cardwo.c
blob54daca4f57b4321aa29b541641f0763c3a7d50df
1 /*
2 **********************************************************************
3 * cardwo.c - PCM output HAL for emu10k1 driver
4 * Copyright 1999, 2000 Creative Labs, Inc.
5 *
6 **********************************************************************
7 *
8 * Date Author Summary of changes
9 * ---- ------ ------------------
10 * October 20, 1999 Bertrand Lee base code release
11 *
12 **********************************************************************
13 *
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License as
16 * published by the Free Software Foundation; either version 2 of
17 * the License, or (at your option) any later version.
18 *
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public
25 * License along with this program; if not, write to the Free
26 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
27 * USA.
28 *
29 **********************************************************************
30 */
31
32 #include <linux/poll.h>
33 #include "hwaccess.h"
34 #include "8010.h"
35 #include "voicemgr.h"
36 #include "cardwo.h"
37 #include "audio.h"
38
39 static u32 samplerate_to_linearpitch(u32 samplingrate)
40 {
41 samplingrate = (samplingrate << 8) / 375;
42 return (samplingrate >> 1) + (samplingrate & 1);
43 }
44
45 static void query_format(struct emu10k1_wavedevice *wave_dev, struct wave_format *wave_fmt)
46 {
47 int i, j, do_passthrough = 0, is_ac3 = 0;
48 struct emu10k1_card *card = wave_dev->card;
49 struct woinst *woinst = wave_dev->woinst;
50
51 if ((wave_fmt->channels > 2) && (wave_fmt->id != AFMT_S16_LE) && (wave_fmt->id != AFMT_U8))
52 wave_fmt->channels = 2;
53
54 if ((wave_fmt->channels < 1) || (wave_fmt->channels > WAVEOUT_MAXVOICES))
55 wave_fmt->channels = 2;
56
57 if (wave_fmt->channels == 2)
58 woinst->num_voices = 1;
59 else
60 woinst->num_voices = wave_fmt->channels;
61
62 if (wave_fmt->samplingrate >= 0x2ee00)
63 wave_fmt->samplingrate = 0x2ee00;
64
65 wave_fmt->passthrough = 0;
66 do_passthrough = is_ac3 = 0;
67
68 if (card->pt.selected)
69 do_passthrough = 1;
70
71 switch (wave_fmt->id) {
72 case AFMT_S16_LE:
73 wave_fmt->bitsperchannel = 16;
74 break;
75 case AFMT_U8:
76 wave_fmt->bitsperchannel = 8;
77 break;
78 case AFMT_AC3:
79 do_passthrough = 1;
80 is_ac3 = 1;
81 break;
82 default:
83 wave_fmt->id = AFMT_S16_LE;
84 wave_fmt->bitsperchannel = 16;
85 break;
86 }
87 if (do_passthrough) {
88 /* currently only one waveout instance may use pass-through */
89 if (woinst->state != WAVE_STATE_CLOSED ||
90 card->pt.state != PT_STATE_INACTIVE ||
91 (wave_fmt->samplingrate != 48000 && !is_ac3)) {
92 DPF(2, "unable to set pass-through mode\n");
93 } else if (USE_PT_METHOD1) {
94 i = emu10k1_find_control_gpr(&card->mgr, card->pt.patch_name, card->pt.intr_gpr_name);
95 j = emu10k1_find_control_gpr(&card->mgr, card->pt.patch_name, card->pt.enable_gpr_name);
96 if (i < 0 || j < 0)
97 DPF(2, "unable to set pass-through mode\n");
98 else {
99 wave_fmt->samplingrate = 48000;
100 wave_fmt->channels = 2;
101 card->pt.pos_gpr = emu10k1_find_control_gpr(&card->mgr, card->pt.patch_name,
102 card->pt.pos_gpr_name);
103 wave_fmt->passthrough = 1;
104 card->pt.intr_gpr = i;
105 card->pt.enable_gpr = j;
106 card->pt.state = PT_STATE_INACTIVE;
107
108 DPD(2, "is_ac3 is %d\n", is_ac3);
109 card->pt.ac3data = is_ac3;
110 wave_fmt->bitsperchannel = 16;
111 }
112 }else{
113 DPF(2, "Using Passthrough Method 2\n");
114 card->pt.enable_gpr = emu10k1_find_control_gpr(&card->mgr, card->pt.patch_name,
115 card->pt.enable_gpr_name);
116 wave_fmt->passthrough = 2;
117 wave_fmt->bitsperchannel = 16;
118 }
119 }
120
121 wave_fmt->bytesperchannel = wave_fmt->bitsperchannel >> 3;
122 wave_fmt->bytespersample = wave_fmt->channels * wave_fmt->bytesperchannel;
123 wave_fmt->bytespersec = wave_fmt->bytespersample * wave_fmt->samplingrate;
124
125 if (wave_fmt->channels == 2)
126 wave_fmt->bytespervoicesample = wave_fmt->channels * wave_fmt->bytesperchannel;
127 else
128 wave_fmt->bytespervoicesample = wave_fmt->bytesperchannel;
129 }
130
131 static int get_voice(struct emu10k1_card *card, struct woinst *woinst, unsigned int voicenum)
132 {
133 struct emu_voice *voice = &woinst->voice[voicenum];
134
135 /* Allocate voices here, if no voices available, return error. */
136
137 voice->usage = VOICE_USAGE_PLAYBACK;
138
139 voice->flags = 0;
140
141 if (woinst->format.channels == 2)
142 voice->flags |= VOICE_FLAGS_STEREO;
143
144 if (woinst->format.bitsperchannel == 16)
145 voice->flags |= VOICE_FLAGS_16BIT;
146
147 if (emu10k1_voice_alloc(card, voice) < 0) {
148 voice->usage = VOICE_USAGE_FREE;
149 return -1;
150 }
151
152 /* Calculate pitch */
153 voice->initial_pitch = (u16) (srToPitch(woinst->format.samplingrate) >> 8);
154 voice->pitch_target = samplerate_to_linearpitch(woinst->format.samplingrate);
155
156 DPD(2, "Initial pitch --> %#x\n", voice->initial_pitch);
157
158 voice->startloop = (voice->mem.emupageindex << 12) /
159 woinst->format.bytespervoicesample;
160 voice->endloop = voice->startloop + woinst->buffer.size / woinst->format.bytespervoicesample;
161 voice->start = voice->startloop;
162
163
164 voice->params[0].volume_target = 0xffff;
165 voice->params[0].initial_fc = 0xff;
166 voice->params[0].initial_attn = 0x00;
167 voice->params[0].byampl_env_sustain = 0x7f;
168 voice->params[0].byampl_env_decay = 0x7f;
169
170
171 if (voice->flags & VOICE_FLAGS_STEREO) {
172 if (woinst->format.passthrough == 2) {
173 voice->params[0].send_routing = voice->params[1].send_routing = card->waveout.send_routing[ROUTE_PT];
174 voice->params[0].send_routing2 = voice->params[1].send_routing2 = card->waveout.send_routing2[ROUTE_PT];
175 voice->params[0].send_dcba = 0xff;
176 voice->params[1].send_dcba = 0xff00;
177 voice->params[0].send_hgfe = voice->params[1].send_hgfe=0;
178 } else {
179 voice->params[0].send_dcba = card->waveout.send_dcba[SEND_LEFT];
180 voice->params[0].send_hgfe = card->waveout.send_hgfe[SEND_LEFT];
181 voice->params[1].send_dcba = card->waveout.send_dcba[SEND_RIGHT];
182 voice->params[1].send_hgfe = card->waveout.send_hgfe[SEND_RIGHT];
183
184 if (woinst->device) {
185 // /dev/dps1
186 voice->params[0].send_routing = voice->params[1].send_routing = card->waveout.send_routing[ROUTE_PCM1];
187 voice->params[0].send_routing2 = voice->params[1].send_routing2 = card->waveout.send_routing2[ROUTE_PCM1];
188 } else {
189 voice->params[0].send_routing = voice->params[1].send_routing = card->waveout.send_routing[ROUTE_PCM];
190 voice->params[0].send_routing2 = voice->params[1].send_routing2 = card->waveout.send_routing2[ROUTE_PCM];
191 }
192 }
193
194 voice->params[1].volume_target = 0xffff;
195 voice->params[1].initial_fc = 0xff;
196 voice->params[1].initial_attn = 0x00;
197 voice->params[1].byampl_env_sustain = 0x7f;
198 voice->params[1].byampl_env_decay = 0x7f;
199 } else {
200 if (woinst->num_voices > 1) {
201 // Multichannel pcm
202 voice->params[0].send_dcba=0xff;
203 voice->params[0].send_hgfe=0;
204 if (card->is_audigy) {
205 voice->params[0].send_routing = 0x3f3f3f00 + card->mchannel_fx + voicenum;
206 voice->params[0].send_routing2 = 0x3f3f3f3f;
207 } else {
208 voice->params[0].send_routing = 0xfff0 + card->mchannel_fx + voicenum;
209 }
210
211 } else {
212 voice->params[0].send_dcba = card->waveout.send_dcba[SEND_MONO];
213 voice->params[0].send_hgfe = card->waveout.send_hgfe[SEND_MONO];
214
215 if (woinst->device) {
216 voice->params[0].send_routing = card->waveout.send_routing[ROUTE_PCM1];
217 voice->params[0].send_routing2 = card->waveout.send_routing2[ROUTE_PCM1];
218 } else {
219 voice->params[0].send_routing = card->waveout.send_routing[ROUTE_PCM];
220 voice->params[0].send_routing2 = card->waveout.send_routing2[ROUTE_PCM];
221 }
222 }
223 }
224
225 DPD(2, "voice: startloop=%#x, endloop=%#x\n", voice->startloop, voice->endloop);
226
227 emu10k1_voice_playback_setup(voice);
228
229 return 0;
230 }
231
232 int emu10k1_waveout_open(struct emu10k1_wavedevice *wave_dev)
233 {
234 struct emu10k1_card *card = wave_dev->card;
235 struct woinst *woinst = wave_dev->woinst;
236 struct waveout_buffer *buffer = &woinst->buffer;
237 unsigned int voicenum;
238 u16 delay;
239
240 DPF(2, "emu10k1_waveout_open()\n");
241
242 for (voicenum = 0; voicenum < woinst->num_voices; voicenum++) {
243 if (emu10k1_voice_alloc_buffer(card, &woinst->voice[voicenum].mem, woinst->buffer.pages) < 0) {
244 ERROR();
245 emu10k1_waveout_close(wave_dev);
246 return -1;
247 }
248
249 if (get_voice(card, woinst, voicenum) < 0) {
250 ERROR();
251 emu10k1_waveout_close(wave_dev);
252 return -1;
253 }
254 }
255
256 buffer->fill_silence = 0;
257 buffer->silence_bytes = 0;
258 buffer->silence_pos = 0;
259 buffer->hw_pos = 0;
260 buffer->free_bytes = woinst->buffer.size;
261
262 delay = (48000 * woinst->buffer.fragment_size) /
263 (woinst->format.samplingrate * woinst->format.bytespervoicesample);
264
265 emu10k1_timer_install(card, &woinst->timer, delay);
266
267 woinst->state = WAVE_STATE_OPEN;
268
269 return 0;
270 }
271
272 void emu10k1_waveout_close(struct emu10k1_wavedevice *wave_dev)
273 {
274 struct emu10k1_card *card = wave_dev->card;
275 struct woinst *woinst = wave_dev->woinst;
276 unsigned int voicenum;
277
278 DPF(2, "emu10k1_waveout_close()\n");
279
280 emu10k1_waveout_stop(wave_dev);
281
282 emu10k1_timer_uninstall(card, &woinst->timer);
283
284 for (voicenum = 0; voicenum < woinst->num_voices; voicenum++) {
285 emu10k1_voice_free(&woinst->voice[voicenum]);
286 emu10k1_voice_free_buffer(card, &woinst->voice[voicenum].mem);
287 }
288
289 woinst->state = WAVE_STATE_CLOSED;
290 }
291
292 void emu10k1_waveout_start(struct emu10k1_wavedevice *wave_dev)
293 {
294 struct emu10k1_card *card = wave_dev->card;
295 struct woinst *woinst = wave_dev->woinst;
296 struct pt_data *pt = &card->pt;
297
298 DPF(2, "emu10k1_waveout_start()\n");
299
300 if (woinst->format.passthrough == 2) {
301 emu10k1_pt_setup(wave_dev);
302 sblive_writeptr(card, (card->is_audigy ? A_GPR_BASE : GPR_BASE) + pt->enable_gpr, 0, 1);
303 pt->state = PT_STATE_PLAYING;
304 }
305
306 /* Actual start */
307 emu10k1_voices_start(woinst->voice, woinst->num_voices, woinst->total_played);
308
309 emu10k1_timer_enable(card, &woinst->timer);
310
311 woinst->state |= WAVE_STATE_STARTED;
312 }
313
314 int emu10k1_waveout_setformat(struct emu10k1_wavedevice *wave_dev, struct wave_format *format)
315 {
316 struct emu10k1_card *card = wave_dev->card;
317 struct woinst *woinst = wave_dev->woinst;
318 unsigned int voicenum;
319 u16 delay;
320
321 DPF(2, "emu10k1_waveout_setformat()\n");
322
323 if (woinst->state & WAVE_STATE_STARTED)
324 return -1;
325
326 query_format(wave_dev, format);
327
328 if (woinst->format.samplingrate != format->samplingrate ||
329 woinst->format.channels != format->channels ||
330 woinst->format.bitsperchannel != format->bitsperchannel) {
331
332 woinst->format = *format;
333
334 if (woinst->state == WAVE_STATE_CLOSED)
335 return 0;
336
337 emu10k1_timer_uninstall(card, &woinst->timer);
338
339 for (voicenum = 0; voicenum < woinst->num_voices; voicenum++) {
340 emu10k1_voice_free(&woinst->voice[voicenum]);
341
342 if (get_voice(card, woinst, voicenum) < 0) {
343 ERROR();
344 emu10k1_waveout_close(wave_dev);
345 return -1;
346 }
347 }
348
349 delay = (48000 * woinst->buffer.fragment_size) /
350 (woinst->format.samplingrate * woinst->format.bytespervoicesample);
351
352 emu10k1_timer_install(card, &woinst->timer, delay);
353 }
354
355 return 0;
356 }
357
358 void emu10k1_waveout_stop(struct emu10k1_wavedevice *wave_dev)
359 {
360 struct emu10k1_card *card = wave_dev->card;
361 struct woinst *woinst = wave_dev->woinst;
362
363 DPF(2, "emu10k1_waveout_stop()\n");
364
365 if (!(woinst->state & WAVE_STATE_STARTED))
366 return;
367
368 emu10k1_timer_disable(card, &woinst->timer);
369
370 /* Stop actual voices */
371 emu10k1_voices_stop(woinst->voice, woinst->num_voices);
372
373 emu10k1_waveout_update(woinst);
374
375 woinst->state &= ~WAVE_STATE_STARTED;
376 }
377
378 /**
379 * emu10k1_waveout_getxfersize -
380 *
381 * gives the total free bytes on the voice buffer, including silence bytes
382 * (basically: total_free_bytes = free_bytes + silence_bytes).
383 *
384 */
385 void emu10k1_waveout_getxfersize(struct woinst *woinst, u32 *total_free_bytes)
386 {
387 struct waveout_buffer *buffer = &woinst->buffer;
388 int pending_bytes;
389
390 if (woinst->mmapped) {
391 *total_free_bytes = buffer->free_bytes;
392 return;
393 }
394
395 pending_bytes = buffer->size - buffer->free_bytes;
396
397 buffer->fill_silence = (pending_bytes < (signed) buffer->fragment_size * 2) ? 1 : 0;
398
399 if (pending_bytes > (signed) buffer->silence_bytes) {
400 *total_free_bytes = (buffer->free_bytes + buffer->silence_bytes);
401 } else {
402 *total_free_bytes = buffer->size;
403 buffer->silence_bytes = pending_bytes;
404 if (pending_bytes < 0) {
405 buffer->silence_pos = buffer->hw_pos;
406 buffer->silence_bytes = 0;
407 buffer->free_bytes = buffer->size;
408 DPF(1, "buffer underrun\n");
409 }
410 }
411 }
412
413 /**
414 * copy_block -
415 *
416 * copies a block of pcm data to a voice buffer.
417 * Notice that the voice buffer is actually a set of disjointed memory pages.
418 *
419 */
420 static void copy_block(void **dst, u32 str, u8 __user *src, u32 len)
421 {
422 unsigned int pg;
423 unsigned int pgoff;
424 unsigned int k;
425
426 pg = str / PAGE_SIZE;
427 pgoff = str % PAGE_SIZE;
428
429 if (len > PAGE_SIZE - pgoff) {
430 k = PAGE_SIZE - pgoff;
431 if (__copy_from_user((u8 *)dst[pg] + pgoff, src, k))
432 return;
433 len -= k;
434 while (len > PAGE_SIZE) {
435 if (__copy_from_user(dst[++pg], src + k, PAGE_SIZE))
436 return;
437 k += PAGE_SIZE;
438 len -= PAGE_SIZE;
439 }
440 if (__copy_from_user(dst[++pg], src + k, len))
441 return;
442
443 } else
444 __copy_from_user((u8 *)dst[pg] + pgoff, src, len);
445 }
446
447 /**
448 * copy_ilv_block -
449 *
450 * copies a block of pcm data containing n interleaved channels to n mono voice buffers.
451 * Notice that the voice buffer is actually a set of disjointed memory pages.
452 *
453 */
454 static void copy_ilv_block(struct woinst *woinst, u32 str, u8 __user *src, u32 len)
455 {
456 unsigned int pg;
457 unsigned int pgoff;
458 unsigned int voice_num;
459 struct emu_voice *voice = woinst->voice;
460
461 pg = str / PAGE_SIZE;
462 pgoff = str % PAGE_SIZE;
463
464 while (len) {
465 for (voice_num = 0; voice_num < woinst->num_voices; voice_num++) {
466 if (__copy_from_user((u8 *)(voice[voice_num].mem.addr[pg]) + pgoff, src, woinst->format.bytespervoicesample))
467 return;
468 src += woinst->format.bytespervoicesample;
469 }
470
471 len -= woinst->format.bytespervoicesample;
472
473 pgoff += woinst->format.bytespervoicesample;
474 if (pgoff >= PAGE_SIZE) {
475 pgoff = 0;
476 pg++;
477 }
478 }
479 }
480
481 /**
482 * fill_block -
483 *
484 * fills a set voice buffers with a block of a given sample.
485 *
486 */
487 static void fill_block(struct woinst *woinst, u32 str, u8 data, u32 len)
488 {
489 unsigned int pg;
490 unsigned int pgoff;
491 unsigned int voice_num;
492 struct emu_voice *voice = woinst->voice;
493 unsigned int k;
494
495 pg = str / PAGE_SIZE;
496 pgoff = str % PAGE_SIZE;
497
498 if (len > PAGE_SIZE - pgoff) {
499 k = PAGE_SIZE - pgoff;
500 for (voice_num = 0; voice_num < woinst->num_voices; voice_num++)
501 memset((u8 *)voice[voice_num].mem.addr[pg] + pgoff, data, k);
502 len -= k;
503 while (len > PAGE_SIZE) {
504 pg++;
505 for (voice_num = 0; voice_num < woinst->num_voices; voice_num++)
506 memset(voice[voice_num].mem.addr[pg], data, PAGE_SIZE);
507
508 len -= PAGE_SIZE;
509 }
510 pg++;
511 for (voice_num = 0; voice_num < woinst->num_voices; voice_num++)
512 memset(voice[voice_num].mem.addr[pg], data, len);
513
514 } else {
515 for (voice_num = 0; voice_num < woinst->num_voices; voice_num++)
516 memset((u8 *)voice[voice_num].mem.addr[pg] + pgoff, data, len);
517 }
518 }
519
520 /**
521 * emu10k1_waveout_xferdata -
522 *
523 * copies pcm data to the voice buffer. Silence samples
524 * previously added to the buffer are overwritten.
525 *
526 */
527 void emu10k1_waveout_xferdata(struct woinst *woinst, u8 __user *data, u32 *size)
528 {
529 struct waveout_buffer *buffer = &woinst->buffer;
530 struct voice_mem *mem = &woinst->voice[0].mem;
531 u32 sizetocopy, sizetocopy_now, start;
532 unsigned long flags;
533
534 sizetocopy = min_t(u32, buffer->size, *size);
535 *size = sizetocopy;
536
537 if (!sizetocopy)
538 return;
539
540 spin_lock_irqsave(&woinst->lock, flags);
541 start = (buffer->size + buffer->silence_pos - buffer->silence_bytes) % buffer->size;
542
543 if (sizetocopy > buffer->silence_bytes) {
544 buffer->silence_pos += sizetocopy - buffer->silence_bytes;
545 buffer->free_bytes -= sizetocopy - buffer->silence_bytes;
546 buffer->silence_bytes = 0;
547 } else
548 buffer->silence_bytes -= sizetocopy;
549
550 spin_unlock_irqrestore(&woinst->lock, flags);
551
552 sizetocopy_now = buffer->size - start;
553 if (sizetocopy > sizetocopy_now) {
554 sizetocopy -= sizetocopy_now;
555 if (woinst->num_voices > 1) {
556 copy_ilv_block(woinst, start, data, sizetocopy_now);
557 copy_ilv_block(woinst, 0, data + sizetocopy_now * woinst->num_voices, sizetocopy);
558 } else {
559 copy_block(mem->addr, start, data, sizetocopy_now);
560 copy_block(mem->addr, 0, data + sizetocopy_now, sizetocopy);
561 }
562 } else {
563 if (woinst->num_voices > 1)
564 copy_ilv_block(woinst, start, data, sizetocopy);
565 else
566 copy_block(mem->addr, start, data, sizetocopy);
567 }
568 }
569
570 /**
571 * emu10k1_waveout_fillsilence -
572 *
573 * adds samples of silence to the voice buffer so that we
574 * don't loop over stale pcm data.
575 *
576 */
577 void emu10k1_waveout_fillsilence(struct woinst *woinst)
578 {
579 struct waveout_buffer *buffer = &woinst->buffer;
580 u32 sizetocopy, sizetocopy_now, start;
581 u8 filldata;
582 unsigned long flags;
583
584 sizetocopy = buffer->fragment_size;
585
586 if (woinst->format.bitsperchannel == 16)
587 filldata = 0x00;
588 else
589 filldata = 0x80;
590
591 spin_lock_irqsave(&woinst->lock, flags);
592 buffer->silence_bytes += sizetocopy;
593 buffer->free_bytes -= sizetocopy;
594 buffer->silence_pos %= buffer->size;
595 start = buffer->silence_pos;
596 buffer->silence_pos += sizetocopy;
597 spin_unlock_irqrestore(&woinst->lock, flags);
598
599 sizetocopy_now = buffer->size - start;
600
601 if (sizetocopy > sizetocopy_now) {
602 sizetocopy -= sizetocopy_now;
603 fill_block(woinst, start, filldata, sizetocopy_now);
604 fill_block(woinst, 0, filldata, sizetocopy);
605 } else {
606 fill_block(woinst, start, filldata, sizetocopy);
607 }
608 }
609
610 /**
611 * emu10k1_waveout_update -
612 *
613 * updates the position of the voice buffer hardware pointer (hw_pos)
614 * and the number of free bytes on the buffer (free_bytes).
615 * The free bytes _don't_ include silence bytes that may have been
616 * added to the buffer.
617 *
618 */
619 void emu10k1_waveout_update(struct woinst *woinst)
620 {
621 u32 hw_pos;
622 u32 diff;
623
624 /* There is no actual start yet */
625 if (!(woinst->state & WAVE_STATE_STARTED)) {
626 hw_pos = woinst->buffer.hw_pos;
627 } else {
628 /* hw_pos in sample units */
629 hw_pos = sblive_readptr(woinst->voice[0].card, CCCA_CURRADDR, woinst->voice[0].num);
630
631 if(hw_pos < woinst->voice[0].start)
632 hw_pos += woinst->buffer.size / woinst->format.bytespervoicesample - woinst->voice[0].start;
633 else
634 hw_pos -= woinst->voice[0].start;
635
636 hw_pos *= woinst->format.bytespervoicesample;
637 }
638
639 diff = (woinst->buffer.size + hw_pos - woinst->buffer.hw_pos) % woinst->buffer.size;
640 woinst->total_played += diff;
641 woinst->buffer.free_bytes += diff;
642 woinst->buffer.hw_pos = hw_pos;
643 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree