git.oblomov.eu Git - linux-2.6/blob - sound/oss/emu10k1/cardwo.c

   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 }