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
  23 #include <linux/sched/signal.h>
  24 #include <linux/init.h>
  25 #include <linux/slab.h>
  26 #include <sound/initval.h>
  27 #include <sound/pcm.h>
  28
  29 /*
  30  * define the following if you want to use this pcm with non-interleaved mode
  31  */
  32 /* #define USE_NONINTERLEAVE */
  33
  34 /* NOTE: for using the non-interleaved mode with alsa-lib, you have to set
  35  * mmap_emulation flag to 1 in your .asoundrc, such like
  36  *
  37  *      pcm.emu8k {
  38  *              type plug
  39  *              slave.pcm {
  40  *                      type hw
  41  *                      card 0
  42  *                      device 1
  43  *                      mmap_emulation 1
  44  *              }
  45  *      }
  46  *
  47  * besides, for the time being, the non-interleaved mode doesn't work well on
  48  * alsa-lib...
  49  */
  50
  51
  52 struct snd_emu8k_pcm {
  53         struct snd_emu8000 *emu;
  54         struct snd_pcm_substream *substream;
  55
  56         unsigned int allocated_bytes;
  57         struct snd_util_memblk *block;
  58         unsigned int offset;
  59         unsigned int buf_size;
  60         unsigned int period_size;
  61         unsigned int loop_start[2];
  62         unsigned int pitch;
  63         int panning[2];
  64         int last_ptr;
  65         int period_pos;
  66         int voices;
  67         unsigned int dram_opened: 1;
  68         unsigned int running: 1;
  69         unsigned int timer_running: 1;
  70         struct timer_list timer;
  71         spinlock_t timer_lock;
  72 };
  73
  74 #define LOOP_BLANK_SIZE         8
  75
  76
  77 /*
  78  * open up channels for the simultaneous data transfer and playback
  79  */
  80 static int
  81 emu8k_open_dram_for_pcm(struct snd_emu8000 *emu, int channels)
  82 {
  83         int i;
  84
  85         /* reserve up to 2 voices for playback */
  86         snd_emux_lock_voice(emu->emu, 0);
  87         if (channels > 1)
  88                 snd_emux_lock_voice(emu->emu, 1);
  89
  90         /* reserve 28 voices for loading */
  91         for (i = channels + 1; i < EMU8000_DRAM_VOICES; i++) {
  92                 unsigned int mode = EMU8000_RAM_WRITE;
  93                 snd_emux_lock_voice(emu->emu, i);
  94 #ifndef USE_NONINTERLEAVE
  95                 if (channels > 1 && (i & 1) != 0)
  96                         mode |= EMU8000_RAM_RIGHT;
  97 #endif
  98                 snd_emu8000_dma_chan(emu, i, mode);
  99         }
 100
 101         /* assign voice 31 and 32 to ROM */
 102         EMU8000_VTFT_WRITE(emu, 30, 0);
 103         EMU8000_PSST_WRITE(emu, 30, 0x1d8);
 104         EMU8000_CSL_WRITE(emu, 30, 0x1e0);
 105         EMU8000_CCCA_WRITE(emu, 30, 0x1d8);
 106         EMU8000_VTFT_WRITE(emu, 31, 0);
 107         EMU8000_PSST_WRITE(emu, 31, 0x1d8);
 108         EMU8000_CSL_WRITE(emu, 31, 0x1e0);
 109         EMU8000_CCCA_WRITE(emu, 31, 0x1d8);
 110
 111         return 0;
 112 }
 113
 114 /*
 115  */
 116 static void
 117 snd_emu8000_write_wait(struct snd_emu8000 *emu, int can_schedule)
 118 {
 119         while ((EMU8000_SMALW_READ(emu) & 0x80000000) != 0) {
 120                 if (can_schedule) {
 121                         schedule_timeout_interruptible(1);
 122                         if (signal_pending(current))
 123                                 break;
 124                 }
 125         }
 126 }
 127
 128 /*
 129  * close all channels
 130  */
 131 static void
 132 emu8k_close_dram(struct snd_emu8000 *emu)
 133 {
 134         int i;
 135
 136         for (i = 0; i < 2; i++)
 137                 snd_emux_unlock_voice(emu->emu, i);
 138         for (; i < EMU8000_DRAM_VOICES; i++) {
 139                 snd_emu8000_dma_chan(emu, i, EMU8000_RAM_CLOSE);
 140                 snd_emux_unlock_voice(emu->emu, i);
 141         }
 142 }
 143
 144 /*
 145  * convert Hz to AWE32 rate offset (see emux/soundfont.c)
 146  */
 147
 148 #define OFFSET_SAMPLERATE       1011119         /* base = 44100 */
 149 #define SAMPLERATE_RATIO        4096
 150
 151 static int calc_rate_offset(int hz)
 152 {
 153         return snd_sf_linear_to_log(hz, OFFSET_SAMPLERATE, SAMPLERATE_RATIO);
 154 }
 155
 156
 157 /*
 158  */
 159
 160 static struct snd_pcm_hardware emu8k_pcm_hw = {
 161 #ifdef USE_NONINTERLEAVE
 162         .info =                 SNDRV_PCM_INFO_NONINTERLEAVED,
 163 #else
 164         .info =                 SNDRV_PCM_INFO_INTERLEAVED,
 165 #endif
 166         .formats =              SNDRV_PCM_FMTBIT_S16_LE,
 167         .rates =                SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
 168         .rate_min =             4000,
 169         .rate_max =             48000,
 170         .channels_min =         1,
 171         .channels_max =         2,
 172         .buffer_bytes_max =     (128*1024),
 173         .period_bytes_min =     1024,
 174         .period_bytes_max =     (128*1024),
 175         .periods_min =          2,
 176         .periods_max =          1024,
 177         .fifo_size =            0,
 178
 179 };
 180
 181 /*
 182  * get the current position at the given channel from CCCA register
 183  */
 184 static inline int emu8k_get_curpos(struct snd_emu8k_pcm *rec, int ch)
 185 {
 186         int val = EMU8000_CCCA_READ(rec->emu, ch) & 0xfffffff;
 187         val -= rec->loop_start[ch] - 1;
 188         return val;
 189 }
 190
 191
 192 /*
 193  * timer interrupt handler
 194  * check the current position and update the period if necessary.
 195  */
 196 static void emu8k_pcm_timer_func(unsigned long data)
 197 {
 198         struct snd_emu8k_pcm *rec = (struct snd_emu8k_pcm *)data;
 199         int ptr, delta;
 200
 201         spin_lock(&rec->timer_lock);
 202         /* update the current pointer */
 203         ptr = emu8k_get_curpos(rec, 0);
 204         if (ptr < rec->last_ptr)
 205                 delta = ptr + rec->buf_size - rec->last_ptr;
 206         else
 207                 delta = ptr - rec->last_ptr;
 208         rec->period_pos += delta;
 209         rec->last_ptr = ptr;
 210
 211         /* reprogram timer */
 212         mod_timer(&rec->timer, jiffies + 1);
 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(struct snd_pcm_substream *subs)
 230 {
 231         struct snd_emu8000 *emu = snd_pcm_substream_chip(subs);
 232         struct snd_emu8k_pcm *rec;
 233         struct snd_pcm_runtime *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         setup_timer(&rec->timer, emu8k_pcm_timer_func, (unsigned long)rec);
 245
 246         runtime->hw = emu8k_pcm_hw;
 247         runtime->hw.buffer_bytes_max = emu->mem_size - LOOP_BLANK_SIZE * 3;
 248         runtime->hw.period_bytes_max = runtime->hw.buffer_bytes_max / 2;
 249
 250         /* use timer to update periods.. (specified in msec) */
 251         snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
 252                                      (1000000 + HZ - 1) / HZ, UINT_MAX);
 253
 254         return 0;
 255 }
 256
 257 static int emu8k_pcm_close(struct snd_pcm_substream *subs)
 258 {
 259         struct snd_emu8k_pcm *rec = subs->runtime->private_data;
 260         kfree(rec);
 261         subs->runtime->private_data = NULL;
 262         return 0;
 263 }
 264
 265 /*
 266  * calculate pitch target
 267  */
 268 static int calc_pitch_target(int pitch)
 269 {
 270         int ptarget = 1 << (pitch >> 12);
 271         if (pitch & 0x800) ptarget += (ptarget * 0x102e) / 0x2710;
 272         if (pitch & 0x400) ptarget += (ptarget * 0x764) / 0x2710;
 273         if (pitch & 0x200) ptarget += (ptarget * 0x389) / 0x2710;
 274         ptarget += (ptarget >> 1);
 275         if (ptarget > 0xffff) ptarget = 0xffff;
 276         return ptarget;
 277 }
 278
 279 /*
 280  * set up the voice
 281  */
 282 static void setup_voice(struct snd_emu8k_pcm *rec, int ch)
 283 {
 284         struct snd_emu8000 *hw = rec->emu;
 285         unsigned int temp;
 286
 287         /* channel to be silent and idle */
 288         EMU8000_DCYSUSV_WRITE(hw, ch, 0x0080);
 289         EMU8000_VTFT_WRITE(hw, ch, 0x0000FFFF);
 290         EMU8000_CVCF_WRITE(hw, ch, 0x0000FFFF);
 291         EMU8000_PTRX_WRITE(hw, ch, 0);
 292         EMU8000_CPF_WRITE(hw, ch, 0);
 293
 294         /* pitch offset */
 295         EMU8000_IP_WRITE(hw, ch, rec->pitch);
 296         /* set envelope parameters */
 297         EMU8000_ENVVAL_WRITE(hw, ch, 0x8000);
 298         EMU8000_ATKHLD_WRITE(hw, ch, 0x7f7f);
 299         EMU8000_DCYSUS_WRITE(hw, ch, 0x7f7f);
 300         EMU8000_ENVVOL_WRITE(hw, ch, 0x8000);
 301         EMU8000_ATKHLDV_WRITE(hw, ch, 0x7f7f);
 302         /* decay/sustain parameter for volume envelope is used
 303            for triggerg the voice */
 304         /* modulation envelope heights */
 305         EMU8000_PEFE_WRITE(hw, ch, 0x0);
 306         /* lfo1/2 delay */
 307         EMU8000_LFO1VAL_WRITE(hw, ch, 0x8000);
 308         EMU8000_LFO2VAL_WRITE(hw, ch, 0x8000);
 309         /* lfo1 pitch & cutoff shift */
 310         EMU8000_FMMOD_WRITE(hw, ch, 0);
 311         /* lfo1 volume & freq */
 312         EMU8000_TREMFRQ_WRITE(hw, ch, 0);
 313         /* lfo2 pitch & freq */
 314         EMU8000_FM2FRQ2_WRITE(hw, ch, 0);
 315         /* pan & loop start */
 316         temp = rec->panning[ch];
 317         temp = (temp <<24) | ((unsigned int)rec->loop_start[ch] - 1);
 318         EMU8000_PSST_WRITE(hw, ch, temp);
 319         /* chorus & loop end (chorus 8bit, MSB) */
 320         temp = 0; // chorus
 321         temp = (temp << 24) | ((unsigned int)rec->loop_start[ch] + rec->buf_size - 1);
 322         EMU8000_CSL_WRITE(hw, ch, temp);
 323         /* Q & current address (Q 4bit value, MSB) */
 324         temp = 0; // filterQ
 325         temp = (temp << 28) | ((unsigned int)rec->loop_start[ch] - 1);
 326         EMU8000_CCCA_WRITE(hw, ch, temp);
 327         /* clear unknown registers */
 328         EMU8000_00A0_WRITE(hw, ch, 0);
 329         EMU8000_0080_WRITE(hw, ch, 0);
 330 }
 331
 332 /*
 333  * trigger the voice
 334  */
 335 static void start_voice(struct snd_emu8k_pcm *rec, int ch)
 336 {
 337         unsigned long flags;
 338         struct snd_emu8000 *hw = rec->emu;
 339         unsigned int temp, aux;
 340         int pt = calc_pitch_target(rec->pitch);
 341
 342         /* cutoff and volume */
 343         EMU8000_IFATN_WRITE(hw, ch, 0xff00);
 344         EMU8000_VTFT_WRITE(hw, ch, 0xffff);
 345         EMU8000_CVCF_WRITE(hw, ch, 0xffff);
 346         /* trigger envelope */
 347         EMU8000_DCYSUSV_WRITE(hw, ch, 0x7f7f);
 348         /* set reverb and pitch target */
 349         temp = 0; // reverb
 350         if (rec->panning[ch] == 0)
 351                 aux = 0xff;
 352         else
 353                 aux = (-rec->panning[ch]) & 0xff;
 354         temp = (temp << 8) | (pt << 16) | aux;
 355         EMU8000_PTRX_WRITE(hw, ch, temp);
 356         EMU8000_CPF_WRITE(hw, ch, pt << 16);
 357
 358         /* start timer */
 359         spin_lock_irqsave(&rec->timer_lock, flags);
 360         if (! rec->timer_running) {
 361                 mod_timer(&rec->timer, jiffies + 1);
 362                 rec->timer_running = 1;
 363         }
 364         spin_unlock_irqrestore(&rec->timer_lock, flags);
 365 }
 366
 367 /*
 368  * stop the voice immediately
 369  */
 370 static void stop_voice(struct snd_emu8k_pcm *rec, int ch)
 371 {
 372         unsigned long flags;
 373         struct snd_emu8000 *hw = rec->emu;
 374
 375         EMU8000_DCYSUSV_WRITE(hw, ch, 0x807F);
 376
 377         /* stop timer */
 378         spin_lock_irqsave(&rec->timer_lock, flags);
 379         if (rec->timer_running) {
 380                 del_timer(&rec->timer);
 381                 rec->timer_running = 0;
 382         }
 383         spin_unlock_irqrestore(&rec->timer_lock, flags);
 384 }
 385
 386 static int emu8k_pcm_trigger(struct snd_pcm_substream *subs, int cmd)
 387 {
 388         struct snd_emu8k_pcm *rec = subs->runtime->private_data;
 389         int ch;
 390
 391         switch (cmd) {
 392         case SNDRV_PCM_TRIGGER_START:
 393                 for (ch = 0; ch < rec->voices; ch++)
 394                         start_voice(rec, ch);
 395                 rec->running = 1;
 396                 break;
 397         case SNDRV_PCM_TRIGGER_STOP:
 398                 rec->running = 0;
 399                 for (ch = 0; ch < rec->voices; ch++)
 400                         stop_voice(rec, ch);
 401                 break;
 402         default:
 403                 return -EINVAL;
 404         }
 405         return 0;
 406 }
 407
 408
 409 /*
 410  * copy / silence ops
 411  */
 412
 413 /*
 414  * this macro should be inserted in the copy/silence loops
 415  * to reduce the latency.  without this, the system will hang up
 416  * during the whole loop.
 417  */
 418 #define CHECK_SCHEDULER() \
 419 do { \
 420         cond_resched();\
 421         if (signal_pending(current))\
 422                 return -EAGAIN;\
 423 } while (0)
 424
 425
 426 #ifdef USE_NONINTERLEAVE
 427 /* copy one channel block */
 428 static int emu8k_transfer_block(struct snd_emu8000 *emu, int offset, unsigned short *buf, int count)
 429 {
 430         EMU8000_SMALW_WRITE(emu, offset);
 431         while (count > 0) {
 432                 unsigned short sval;
 433                 CHECK_SCHEDULER();
 434                 if (get_user(sval, buf))
 435                         return -EFAULT;
 436                 EMU8000_SMLD_WRITE(emu, sval);
 437                 buf++;
 438                 count--;
 439         }
 440         return 0;
 441 }
 442
 443 static int emu8k_pcm_copy(struct snd_pcm_substream *subs,
 444                           int voice,
 445                           snd_pcm_uframes_t pos,
 446                           void *src,
 447                           snd_pcm_uframes_t count)
 448 {
 449         struct snd_emu8k_pcm *rec = subs->runtime->private_data;
 450         struct snd_emu8000 *emu = rec->emu;
 451
 452         snd_emu8000_write_wait(emu, 1);
 453         if (voice == -1) {
 454                 unsigned short *buf = src;
 455                 int i, err;
 456                 count /= rec->voices;
 457                 for (i = 0; i < rec->voices; i++) {
 458                         err = emu8k_transfer_block(emu, pos + rec->loop_start[i], buf, count);
 459                         if (err < 0)
 460                                 return err;
 461                         buf += count;
 462                 }
 463                 return 0;
 464         } else {
 465                 return emu8k_transfer_block(emu, pos + rec->loop_start[voice], src, count);
 466         }
 467 }
 468
 469 /* make a channel block silence */
 470 static int emu8k_silence_block(struct snd_emu8000 *emu, int offset, int count)
 471 {
 472         EMU8000_SMALW_WRITE(emu, offset);
 473         while (count > 0) {
 474                 CHECK_SCHEDULER();
 475                 EMU8000_SMLD_WRITE(emu, 0);
 476                 count--;
 477         }
 478         return 0;
 479 }
 480
 481 static int emu8k_pcm_silence(struct snd_pcm_substream *subs,
 482                              int voice,
 483                              snd_pcm_uframes_t pos,
 484                              snd_pcm_uframes_t count)
 485 {
 486         struct snd_emu8k_pcm *rec = subs->runtime->private_data;
 487         struct snd_emu8000 *emu = rec->emu;
 488
 489         snd_emu8000_write_wait(emu, 1);
 490         if (voice == -1 && rec->voices == 1)
 491                 voice = 0;
 492         if (voice == -1) {
 493                 int err;
 494                 err = emu8k_silence_block(emu, pos + rec->loop_start[0], count / 2);
 495                 if (err < 0)
 496                         return err;
 497                 return emu8k_silence_block(emu, pos + rec->loop_start[1], count / 2);
 498         } else {
 499                 return emu8k_silence_block(emu, pos + rec->loop_start[voice], count);
 500         }
 501 }
 502
 503 #else /* interleave */
 504
 505 /*
 506  * copy the interleaved data can be done easily by using
 507  * DMA "left" and "right" channels on emu8k engine.
 508  */
 509 static int emu8k_pcm_copy(struct snd_pcm_substream *subs,
 510                           int voice,
 511                           snd_pcm_uframes_t pos,
 512                           void __user *src,
 513                           snd_pcm_uframes_t count)
 514 {
 515         struct snd_emu8k_pcm *rec = subs->runtime->private_data;
 516         struct snd_emu8000 *emu = rec->emu;
 517         unsigned short __user *buf = src;
 518
 519         snd_emu8000_write_wait(emu, 1);
 520         EMU8000_SMALW_WRITE(emu, pos + rec->loop_start[0]);
 521         if (rec->voices > 1)
 522                 EMU8000_SMARW_WRITE(emu, pos + rec->loop_start[1]);
 523
 524         while (count-- > 0) {
 525                 unsigned short sval;
 526                 CHECK_SCHEDULER();
 527                 if (get_user(sval, buf))
 528                         return -EFAULT;
 529                 EMU8000_SMLD_WRITE(emu, sval);
 530                 buf++;
 531                 if (rec->voices > 1) {
 532                         CHECK_SCHEDULER();
 533                         if (get_user(sval, buf))
 534                                 return -EFAULT;
 535                         EMU8000_SMRD_WRITE(emu, sval);
 536                         buf++;
 537                 }
 538         }
 539         return 0;
 540 }
 541
 542 static int emu8k_pcm_silence(struct snd_pcm_substream *subs,
 543                              int voice,
 544                              snd_pcm_uframes_t pos,
 545                              snd_pcm_uframes_t count)
 546 {
 547         struct snd_emu8k_pcm *rec = subs->runtime->private_data;
 548         struct snd_emu8000 *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(struct snd_pcm_substream *subs,
 571                                struct snd_pcm_hw_params *hw_params)
 572 {
 573         struct snd_emu8k_pcm *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(struct snd_pcm_substream *subs)
 596 {
 597         struct snd_emu8k_pcm *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(struct snd_pcm_substream *subs)
 614 {
 615         struct snd_emu8k_pcm *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(struct snd_pcm_substream *subs)
 660 {
 661         struct snd_emu8k_pcm *rec = subs->runtime->private_data;
 662         if (rec->running)
 663                 return emu8k_get_curpos(rec, 0);
 664         return 0;
 665 }
 666
 667
 668 static struct snd_pcm_ops 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(struct snd_pcm *pcm)
 683 {
 684         struct snd_emu8000 *emu = pcm->private_data;
 685         emu->pcm = NULL;
 686 }
 687
 688 int snd_emu8000_pcm_new(struct snd_card *card, struct snd_emu8000 *emu, int index)
 689 {
 690         struct snd_pcm *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 }