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   1 /*
   2  * sound/oss/audio.c
   3  *
   4  * Device file manager for /dev/audio
   5  */
   6
   7 /*
   8  * Copyright (C) by Hannu Savolainen 1993-1997
   9  *
  10  * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
  11  * Version 2 (June 1991). See the "COPYING" file distributed with this software
  12  * for more info.
  13  */
  14 /*
  15  * Thomas Sailer   : ioctl code reworked (vmalloc/vfree removed)
  16  * Thomas Sailer   : moved several static variables into struct audio_operations
  17  *                   (which is grossly misnamed btw.) because they have the same
  18  *                   lifetime as the rest in there and dynamic allocation saves
  19  *                   12k or so
  20  * Thomas Sailer   : use more logical O_NONBLOCK semantics
  21  * Daniel Rodriksson: reworked the use of the device specific copy_user
  22  *                    still generic
  23  * Horst von Brand:  Add missing #include <linux/string.h>
  24  * Chris Rankin    : Update the module-usage counter for the coprocessor,
  25  *                   and decrement the counters again if we cannot open
  26  *                   the audio device.
  27  */
  28
  29 #include <linux/stddef.h>
  30 #include <linux/string.h>
  31 #include <linux/kmod.h>
  32
  33 #include "sound_config.h"
  34 #include "ulaw.h"
  35 #include "coproc.h"
  36
  37 #define NEUTRAL8        0x80
  38 #define NEUTRAL16       0x00
  39
  40
  41 static int             dma_ioctl(int dev, unsigned int cmd, void __user *arg);
  42
  43 static int set_format(int dev, int fmt)
  44 {
  45         if (fmt != AFMT_QUERY)
  46         {
  47                 audio_devs[dev]->local_conversion = 0;
  48
  49                 if (!(audio_devs[dev]->format_mask & fmt))      /* Not supported */
  50                 {
  51                         if (fmt == AFMT_MU_LAW)
  52                         {
  53                                 fmt = AFMT_U8;
  54                                 audio_devs[dev]->local_conversion = CNV_MU_LAW;
  55                         }
  56                         else
  57                                 fmt = AFMT_U8;  /* This is always supported */
  58                 }
  59                 audio_devs[dev]->audio_format = audio_devs[dev]->d->set_bits(dev, fmt);
  60                 audio_devs[dev]->local_format = fmt;
  61         }
  62         else
  63                 return audio_devs[dev]->local_format;
  64
  65         if (audio_devs[dev]->local_conversion)
  66                 return audio_devs[dev]->local_conversion;
  67         else
  68                 return audio_devs[dev]->local_format;
  69 }
  70
  71 int audio_open(int dev, struct file *file)
  72 {
  73         int ret;
  74         int bits;
  75         int dev_type = dev & 0x0f;
  76         int mode = translate_mode(file);
  77         const struct audio_driver *driver;
  78         const struct coproc_operations *coprocessor;
  79
  80         dev = dev >> 4;
  81
  82         if (dev_type == SND_DEV_DSP16)
  83                 bits = 16;
  84         else
  85                 bits = 8;
  86
  87         if (dev < 0 || dev >= num_audiodevs)
  88                 return -ENXIO;
  89
  90         driver = audio_devs[dev]->d;
  91
  92         if (!try_module_get(driver->owner))
  93                 return -ENODEV;
  94
  95         if ((ret = DMAbuf_open(dev, mode)) < 0)
  96                 goto error_1;
  97
  98         if ( (coprocessor = audio_devs[dev]->coproc) != NULL ) {
  99                 if (!try_module_get(coprocessor->owner))
 100                         goto error_2;
 101
 102                 if ((ret = coprocessor->open(coprocessor->devc, COPR_PCM)) < 0) {
 103                         printk(KERN_WARNING "Sound: Can't access coprocessor device\n");
 104                         goto error_3;
 105                 }
 106         }
 107
 108         audio_devs[dev]->local_conversion = 0;
 109
 110         if (dev_type == SND_DEV_AUDIO)
 111                 set_format(dev, AFMT_MU_LAW);
 112         else
 113                 set_format(dev, bits);
 114
 115         audio_devs[dev]->audio_mode = AM_NONE;
 116
 117         return 0;
 118
 119         /*
 120          * Clean-up stack: this is what needs (un)doing if
 121          * we can't open the audio device ...
 122          */
 123         error_3:
 124         module_put(coprocessor->owner);
 125
 126         error_2:
 127         DMAbuf_release(dev, mode);
 128
 129         error_1:
 130         module_put(driver->owner);
 131
 132         return ret;
 133 }
 134
 135 static void sync_output(int dev)
 136 {
 137         int             p, i;
 138         int             l;
 139         struct dma_buffparms *dmap = audio_devs[dev]->dmap_out;
 140
 141         if (dmap->fragment_size <= 0)
 142                 return;
 143         dmap->flags |= DMA_POST;
 144
 145         /* Align the write pointer with fragment boundaries */
 146
 147         if ((l = dmap->user_counter % dmap->fragment_size) > 0)
 148         {
 149                 int len;
 150                 unsigned long offs = dmap->user_counter % dmap->bytes_in_use;
 151
 152                 len = dmap->fragment_size - l;
 153                 memset(dmap->raw_buf + offs, dmap->neutral_byte, len);
 154                 DMAbuf_move_wrpointer(dev, len);
 155         }
 156
 157         /*
 158          * Clean all unused buffer fragments.
 159          */
 160
 161         p = dmap->qtail;
 162         dmap->flags |= DMA_POST;
 163
 164         for (i = dmap->qlen + 1; i < dmap->nbufs; i++)
 165         {
 166                 p = (p + 1) % dmap->nbufs;
 167                 if (((dmap->raw_buf + p * dmap->fragment_size) + dmap->fragment_size) >
 168                         (dmap->raw_buf + dmap->buffsize))
 169                                 printk(KERN_ERR "audio: Buffer error 2\n");
 170
 171                 memset(dmap->raw_buf + p * dmap->fragment_size,
 172                         dmap->neutral_byte,
 173                         dmap->fragment_size);
 174         }
 175
 176         dmap->flags |= DMA_DIRTY;
 177 }
 178
 179 void audio_release(int dev, struct file *file)
 180 {
 181         const struct coproc_operations *coprocessor;
 182         int mode = translate_mode(file);
 183
 184         dev = dev >> 4;
 185
 186         /*
 187          * We do this in DMAbuf_release(). Why are we doing it
 188          * here? Why don't we test the file mode before setting
 189          * both flags? DMAbuf_release() does.
 190          * ...pester...pester...pester...
 191          */
 192         audio_devs[dev]->dmap_out->closing = 1;
 193         audio_devs[dev]->dmap_in->closing = 1;
 194
 195         /*
 196          * We need to make sure we allocated the dmap_out buffer
 197          * before we go mucking around with it in sync_output().
 198          */
 199         if (mode & OPEN_WRITE)
 200                 sync_output(dev);
 201
 202         if ( (coprocessor = audio_devs[dev]->coproc) != NULL ) {
 203                 coprocessor->close(coprocessor->devc, COPR_PCM);
 204                 module_put(coprocessor->owner);
 205         }
 206         DMAbuf_release(dev, mode);
 207
 208         module_put(audio_devs[dev]->d->owner);
 209 }
 210
 211 static void translate_bytes(const unsigned char *table, unsigned char *buff, int n)
 212 {
 213         unsigned long   i;
 214
 215         if (n <= 0)
 216                 return;
 217
 218         for (i = 0; i < n; ++i)
 219                 buff[i] = table[buff[i]];
 220 }
 221
 222 int audio_write(int dev, struct file *file, const char __user *buf, int count)
 223 {
 224         int c, p, l, buf_size, used, returned;
 225         int err;
 226         char *dma_buf;
 227
 228         dev = dev >> 4;
 229
 230         p = 0;
 231         c = count;
 232
 233         if(count < 0)
 234                 return -EINVAL;
 235
 236         if (!(audio_devs[dev]->open_mode & OPEN_WRITE))
 237                 return -EPERM;
 238
 239         if (audio_devs[dev]->flags & DMA_DUPLEX)
 240                 audio_devs[dev]->audio_mode |= AM_WRITE;
 241         else
 242                 audio_devs[dev]->audio_mode = AM_WRITE;
 243
 244         if (!count)             /* Flush output */
 245         {
 246                   sync_output(dev);
 247                   return 0;
 248         }
 249
 250         while (c)
 251         {
 252                 if ((err = DMAbuf_getwrbuffer(dev, &dma_buf, &buf_size, !!(file->f_flags & O_NONBLOCK))) < 0)
 253                 {
 254                             /* Handle nonblocking mode */
 255                         if ((file->f_flags & O_NONBLOCK) && err == -EAGAIN)
 256                                 return p? p : -EAGAIN;  /* No more space. Return # of accepted bytes */
 257                         return err;
 258                 }
 259                 l = c;
 260
 261                 if (l > buf_size)
 262                         l = buf_size;
 263
 264                 returned = l;
 265                 used = l;
 266                 if (!audio_devs[dev]->d->copy_user)
 267                 {
 268                         if ((dma_buf + l) >
 269                                 (audio_devs[dev]->dmap_out->raw_buf + audio_devs[dev]->dmap_out->buffsize))
 270                         {
 271                                 printk(KERN_ERR "audio: Buffer error 3 (%lx,%d), (%lx, %d)\n", (long) dma_buf, l, (long) audio_devs[dev]->dmap_out->raw_buf, (int) audio_devs[dev]->dmap_out->buffsize);
 272                                 return -EDOM;
 273                         }
 274                         if (dma_buf < audio_devs[dev]->dmap_out->raw_buf)
 275                         {
 276                                 printk(KERN_ERR "audio: Buffer error 13 (%lx<%lx)\n", (long) dma_buf, (long) audio_devs[dev]->dmap_out->raw_buf);
 277                                 return -EDOM;
 278                         }
 279                         if(copy_from_user(dma_buf, &(buf)[p], l))
 280                                 return -EFAULT;
 281                 }
 282                 else audio_devs[dev]->d->copy_user (dev,
 283                                                 dma_buf, 0,
 284                                                 buf, p,
 285                                                 c, buf_size,
 286                                                 &used, &returned,
 287                                                 l);
 288                 l = returned;
 289
 290                 if (audio_devs[dev]->local_conversion & CNV_MU_LAW)
 291                 {
 292                         translate_bytes(ulaw_dsp, (unsigned char *) dma_buf, l);
 293                 }
 294                 c -= used;
 295                 p += used;
 296                 DMAbuf_move_wrpointer(dev, l);
 297
 298         }
 299
 300         return count;
 301 }
 302
 303 int audio_read(int dev, struct file *file, char __user *buf, int count)
 304 {
 305         int             c, p, l;
 306         char           *dmabuf;
 307         int             buf_no;
 308
 309         dev = dev >> 4;
 310         p = 0;
 311         c = count;
 312
 313         if (!(audio_devs[dev]->open_mode & OPEN_READ))
 314                 return -EPERM;
 315
 316         if ((audio_devs[dev]->audio_mode & AM_WRITE) && !(audio_devs[dev]->flags & DMA_DUPLEX))
 317                 sync_output(dev);
 318
 319         if (audio_devs[dev]->flags & DMA_DUPLEX)
 320                 audio_devs[dev]->audio_mode |= AM_READ;
 321         else
 322                 audio_devs[dev]->audio_mode = AM_READ;
 323
 324         while(c)
 325         {
 326                 if ((buf_no = DMAbuf_getrdbuffer(dev, &dmabuf, &l, !!(file->f_flags & O_NONBLOCK))) < 0)
 327                 {
 328                         /*
 329                          *      Nonblocking mode handling. Return current # of bytes
 330                          */
 331
 332                         if (p > 0)              /* Avoid throwing away data */
 333                                 return p;       /* Return it instead */
 334
 335                         if ((file->f_flags & O_NONBLOCK) && buf_no == -EAGAIN)
 336                                 return -EAGAIN;
 337
 338                         return buf_no;
 339                 }
 340                 if (l > c)
 341                         l = c;
 342
 343                 /*
 344                  * Insert any local processing here.
 345                  */
 346
 347                 if (audio_devs[dev]->local_conversion & CNV_MU_LAW)
 348                 {
 349                         translate_bytes(dsp_ulaw, (unsigned char *) dmabuf, l);
 350                 }
 351
 352                 {
 353                         char           *fixit = dmabuf;
 354
 355                         if(copy_to_user(&(buf)[p], fixit, l))
 356                                 return -EFAULT;
 357                 };
 358
 359                 DMAbuf_rmchars(dev, buf_no, l);
 360
 361                 p += l;
 362                 c -= l;
 363         }
 364
 365         return count - c;
 366 }
 367
 368 int audio_ioctl(int dev, struct file *file, unsigned int cmd, void __user *arg)
 369 {
 370         int val, count;
 371         unsigned long flags;
 372         struct dma_buffparms *dmap;
 373         int __user *p = arg;
 374
 375         dev = dev >> 4;
 376
 377         if (_IOC_TYPE(cmd) == 'C')      {
 378                 if (audio_devs[dev]->coproc)    /* Coprocessor ioctl */
 379                         return audio_devs[dev]->coproc->ioctl(audio_devs[dev]->coproc->devc, cmd, arg, 0);
 380                 /* else
 381                         printk(KERN_DEBUG"/dev/dsp%d: No coprocessor for this device\n", dev); */
 382                 return -ENXIO;
 383         }
 384         else switch (cmd)
 385         {
 386                 case SNDCTL_DSP_SYNC:
 387                         if (!(audio_devs[dev]->open_mode & OPEN_WRITE))
 388                                 return 0;
 389                         if (audio_devs[dev]->dmap_out->fragment_size == 0)
 390                                 return 0;
 391                         sync_output(dev);
 392                         DMAbuf_sync(dev);
 393                         DMAbuf_reset(dev);
 394                         return 0;
 395
 396                 case SNDCTL_DSP_POST:
 397                         if (!(audio_devs[dev]->open_mode & OPEN_WRITE))
 398                                 return 0;
 399                         if (audio_devs[dev]->dmap_out->fragment_size == 0)
 400                                 return 0;
 401                         audio_devs[dev]->dmap_out->flags |= DMA_POST | DMA_DIRTY;
 402                         sync_output(dev);
 403                         dma_ioctl(dev, SNDCTL_DSP_POST, NULL);
 404                         return 0;
 405
 406                 case SNDCTL_DSP_RESET:
 407                         audio_devs[dev]->audio_mode = AM_NONE;
 408                         DMAbuf_reset(dev);
 409                         return 0;
 410
 411                 case SNDCTL_DSP_GETFMTS:
 412                         val = audio_devs[dev]->format_mask | AFMT_MU_LAW;
 413                         break;
 414
 415                 case SNDCTL_DSP_SETFMT:
 416                         if (get_user(val, p))
 417                                 return -EFAULT;
 418                         val = set_format(dev, val);
 419                         break;
 420
 421                 case SNDCTL_DSP_GETISPACE:
 422                         if (!(audio_devs[dev]->open_mode & OPEN_READ))
 423                                 return 0;
 424                         if ((audio_devs[dev]->audio_mode & AM_WRITE) && !(audio_devs[dev]->flags & DMA_DUPLEX))
 425                                 return -EBUSY;
 426                         return dma_ioctl(dev, cmd, arg);
 427
 428                 case SNDCTL_DSP_GETOSPACE:
 429                         if (!(audio_devs[dev]->open_mode & OPEN_WRITE))
 430                                 return -EPERM;
 431                         if ((audio_devs[dev]->audio_mode & AM_READ) && !(audio_devs[dev]->flags & DMA_DUPLEX))
 432                                 return -EBUSY;
 433                         return dma_ioctl(dev, cmd, arg);
 434
 435                 case SNDCTL_DSP_NONBLOCK:
 436                         file->f_flags |= O_NONBLOCK;
 437                         return 0;
 438
 439                 case SNDCTL_DSP_GETCAPS:
 440                                 val = 1 | DSP_CAP_MMAP; /* Revision level of this ioctl() */
 441                                 if (audio_devs[dev]->flags & DMA_DUPLEX &&
 442                                         audio_devs[dev]->open_mode == OPEN_READWRITE)
 443                                         val |= DSP_CAP_DUPLEX;
 444                                 if (audio_devs[dev]->coproc)
 445                                         val |= DSP_CAP_COPROC;
 446                                 if (audio_devs[dev]->d->local_qlen)     /* Device has hidden buffers */
 447                                         val |= DSP_CAP_BATCH;
 448                                 if (audio_devs[dev]->d->trigger)        /* Supports SETTRIGGER */
 449                                         val |= DSP_CAP_TRIGGER;
 450                                 break;
 451
 452                 case SOUND_PCM_WRITE_RATE:
 453                         if (get_user(val, p))
 454                                 return -EFAULT;
 455                         val = audio_devs[dev]->d->set_speed(dev, val);
 456                         break;
 457
 458                 case SOUND_PCM_READ_RATE:
 459                         val = audio_devs[dev]->d->set_speed(dev, 0);
 460                         break;
 461
 462                 case SNDCTL_DSP_STEREO:
 463                         if (get_user(val, p))
 464                                 return -EFAULT;
 465                         if (val > 1 || val < 0)
 466                                 return -EINVAL;
 467                         val = audio_devs[dev]->d->set_channels(dev, val + 1) - 1;
 468                         break;
 469
 470                 case SOUND_PCM_WRITE_CHANNELS:
 471                         if (get_user(val, p))
 472                                 return -EFAULT;
 473                         val = audio_devs[dev]->d->set_channels(dev, val);
 474                         break;
 475
 476                 case SOUND_PCM_READ_CHANNELS:
 477                         val = audio_devs[dev]->d->set_channels(dev, 0);
 478                         break;
 479
 480                 case SOUND_PCM_READ_BITS:
 481                         val = audio_devs[dev]->d->set_bits(dev, 0);
 482                         break;
 483
 484                 case SNDCTL_DSP_SETDUPLEX:
 485                         if (audio_devs[dev]->open_mode != OPEN_READWRITE)
 486                                 return -EPERM;
 487                         return (audio_devs[dev]->flags & DMA_DUPLEX) ? 0 : -EIO;
 488
 489                 case SNDCTL_DSP_PROFILE:
 490                         if (get_user(val, p))
 491                                 return -EFAULT;
 492                         if (audio_devs[dev]->open_mode & OPEN_WRITE)
 493                                 audio_devs[dev]->dmap_out->applic_profile = val;
 494                         if (audio_devs[dev]->open_mode & OPEN_READ)
 495                                 audio_devs[dev]->dmap_in->applic_profile = val;
 496                         return 0;
 497
 498                 case SNDCTL_DSP_GETODELAY:
 499                         dmap = audio_devs[dev]->dmap_out;
 500                         if (!(audio_devs[dev]->open_mode & OPEN_WRITE))
 501                                 return -EINVAL;
 502                         if (!(dmap->flags & DMA_ALLOC_DONE))
 503                         {
 504                                 val=0;
 505                                 break;
 506                         }
 507
 508                         spin_lock_irqsave(&dmap->lock,flags);
 509                         /* Compute number of bytes that have been played */
 510                         count = DMAbuf_get_buffer_pointer (dev, dmap, DMODE_OUTPUT);
 511                         if (count < dmap->fragment_size && dmap->qhead != 0)
 512                                 count += dmap->bytes_in_use;    /* Pointer wrap not handled yet */
 513                         count += dmap->byte_counter;
 514
 515                         /* Substract current count from the number of bytes written by app */
 516                         count = dmap->user_counter - count;
 517                         if (count < 0)
 518                                 count = 0;
 519                         spin_unlock_irqrestore(&dmap->lock,flags);
 520                         val = count;
 521                         break;
 522
 523                 default:
 524                         return dma_ioctl(dev, cmd, arg);
 525         }
 526         return put_user(val, p);
 527 }
 528
 529 void audio_init_devices(void)
 530 {
 531         /*
 532          * NOTE! This routine could be called several times during boot.
 533          */
 534 }
 535
 536 void reorganize_buffers(int dev, struct dma_buffparms *dmap, int recording)
 537 {
 538         /*
 539          * This routine breaks the physical device buffers to logical ones.
 540          */
 541
 542         struct audio_operations *dsp_dev = audio_devs[dev];
 543
 544         unsigned i, n;
 545         unsigned sr, nc, sz, bsz;
 546
 547         sr = dsp_dev->d->set_speed(dev, 0);
 548         nc = dsp_dev->d->set_channels(dev, 0);
 549         sz = dsp_dev->d->set_bits(dev, 0);
 550
 551         if (sz == 8)
 552                 dmap->neutral_byte = NEUTRAL8;
 553         else
 554                 dmap->neutral_byte = NEUTRAL16;
 555
 556         if (sr < 1 || nc < 1 || sz < 1)
 557         {
 558 /*              printk(KERN_DEBUG "Warning: Invalid PCM parameters[%d] sr=%d, nc=%d, sz=%d\n", dev, sr, nc, sz);*/
 559                 sr = DSP_DEFAULT_SPEED;
 560                 nc = 1;
 561                 sz = 8;
 562         }
 563
 564         sz = sr * nc * sz;
 565
 566         sz /= 8;                /* #bits -> #bytes */
 567         dmap->data_rate = sz;
 568
 569         if (!dmap->needs_reorg)
 570                 return;
 571         dmap->needs_reorg = 0;
 572
 573         if (dmap->fragment_size == 0)
 574         {
 575                 /* Compute the fragment size using the default algorithm */
 576
 577                 /*
 578                  * Compute a buffer size for time not exceeding 1 second.
 579                  * Usually this algorithm gives a buffer size for 0.5 to 1.0 seconds
 580                  * of sound (using the current speed, sample size and #channels).
 581                  */
 582
 583                 bsz = dmap->buffsize;
 584                 while (bsz > sz)
 585                         bsz /= 2;
 586
 587                 if (bsz == dmap->buffsize)
 588                         bsz /= 2;       /* Needs at least 2 buffers */
 589
 590                 /*
 591                  *    Split the computed fragment to smaller parts. After 3.5a9
 592                  *      the default subdivision is 4 which should give better
 593                  *      results when recording.
 594                  */
 595
 596                 if (dmap->subdivision == 0)     /* Not already set */
 597                 {
 598                         dmap->subdivision = 4;  /* Init to the default value */
 599
 600                         if ((bsz / dmap->subdivision) > 4096)
 601                                 dmap->subdivision *= 2;
 602                         if ((bsz / dmap->subdivision) < 4096)
 603                                 dmap->subdivision = 1;
 604                 }
 605                 bsz /= dmap->subdivision;
 606
 607                 if (bsz < 16)
 608                         bsz = 16;       /* Just a sanity check */
 609
 610                 dmap->fragment_size = bsz;
 611         }
 612         else
 613         {
 614                 /*
 615                  * The process has specified the buffer size with SNDCTL_DSP_SETFRAGMENT or
 616                  * the buffer size computation has already been done.
 617                  */
 618                 if (dmap->fragment_size > (dmap->buffsize / 2))
 619                         dmap->fragment_size = (dmap->buffsize / 2);
 620                 bsz = dmap->fragment_size;
 621         }
 622
 623         if (audio_devs[dev]->min_fragment)
 624                 if (bsz < (1 << audio_devs[dev]->min_fragment))
 625                         bsz = 1 << audio_devs[dev]->min_fragment;
 626         if (audio_devs[dev]->max_fragment)
 627                 if (bsz > (1 << audio_devs[dev]->max_fragment))
 628                         bsz = 1 << audio_devs[dev]->max_fragment;
 629         bsz &= ~0x07;           /* Force size which is multiple of 8 bytes */
 630 #ifdef OS_DMA_ALIGN_CHECK
 631         OS_DMA_ALIGN_CHECK(bsz);
 632 #endif
 633
 634         n = dmap->buffsize / bsz;
 635         if (n > MAX_SUB_BUFFERS)
 636                 n = MAX_SUB_BUFFERS;
 637         if (n > dmap->max_fragments)
 638                 n = dmap->max_fragments;
 639
 640         if (n < 2)
 641         {
 642                 n = 2;
 643                 bsz /= 2;
 644         }
 645         dmap->nbufs = n;
 646         dmap->bytes_in_use = n * bsz;
 647         dmap->fragment_size = bsz;
 648         dmap->max_byte_counter = (dmap->data_rate * 60 * 60) +
 649                         dmap->bytes_in_use;     /* Approximately one hour */
 650
 651         if (dmap->raw_buf)
 652         {
 653                 memset(dmap->raw_buf, dmap->neutral_byte, dmap->bytes_in_use);
 654         }
 655
 656         for (i = 0; i < dmap->nbufs; i++)
 657         {
 658                 dmap->counts[i] = 0;
 659         }
 660
 661         dmap->flags |= DMA_ALLOC_DONE | DMA_EMPTY;
 662 }
 663
 664 static int dma_subdivide(int dev, struct dma_buffparms *dmap, int fact)
 665 {
 666         if (fact == 0)
 667         {
 668                 fact = dmap->subdivision;
 669                 if (fact == 0)
 670                         fact = 1;
 671                 return fact;
 672         }
 673         if (dmap->subdivision != 0 || dmap->fragment_size)      /* Too late to change */
 674                 return -EINVAL;
 675
 676         if (fact > MAX_REALTIME_FACTOR)
 677                 return -EINVAL;
 678
 679         if (fact != 1 && fact != 2 && fact != 4 && fact != 8 && fact != 16)
 680                 return -EINVAL;
 681
 682         dmap->subdivision = fact;
 683         return fact;
 684 }
 685
 686 static int dma_set_fragment(int dev, struct dma_buffparms *dmap, int fact)
 687 {
 688         int bytes, count;
 689
 690         if (fact == 0)
 691                 return -EIO;
 692
 693         if (dmap->subdivision != 0 ||
 694             dmap->fragment_size)        /* Too late to change */
 695                 return -EINVAL;
 696
 697         bytes = fact & 0xffff;
 698         count = (fact >> 16) & 0x7fff;
 699
 700         if (count == 0)
 701                 count = MAX_SUB_BUFFERS;
 702         else if (count < MAX_SUB_BUFFERS)
 703                 count++;
 704
 705         if (bytes < 4 || bytes > 17)    /* <16 || > 512k */
 706                 return -EINVAL;
 707
 708         if (count < 2)
 709                 return -EINVAL;
 710
 711         if (audio_devs[dev]->min_fragment > 0)
 712                 if (bytes < audio_devs[dev]->min_fragment)
 713                         bytes = audio_devs[dev]->min_fragment;
 714
 715         if (audio_devs[dev]->max_fragment > 0)
 716                 if (bytes > audio_devs[dev]->max_fragment)
 717                         bytes = audio_devs[dev]->max_fragment;
 718
 719 #ifdef OS_DMA_MINBITS
 720         if (bytes < OS_DMA_MINBITS)
 721                 bytes = OS_DMA_MINBITS;
 722 #endif
 723
 724         dmap->fragment_size = (1 << bytes);
 725         dmap->max_fragments = count;
 726
 727         if (dmap->fragment_size > dmap->buffsize)
 728                 dmap->fragment_size = dmap->buffsize;
 729
 730         if (dmap->fragment_size == dmap->buffsize &&
 731             audio_devs[dev]->flags & DMA_AUTOMODE)
 732                 dmap->fragment_size /= 2;       /* Needs at least 2 buffers */
 733
 734         dmap->subdivision = 1;  /* Disable SNDCTL_DSP_SUBDIVIDE */
 735         return bytes | ((count - 1) << 16);
 736 }
 737
 738 static int dma_ioctl(int dev, unsigned int cmd, void __user *arg)
 739 {
 740         struct dma_buffparms *dmap_out = audio_devs[dev]->dmap_out;
 741         struct dma_buffparms *dmap_in = audio_devs[dev]->dmap_in;
 742         struct dma_buffparms *dmap;
 743         audio_buf_info info;
 744         count_info cinfo;
 745         int fact, ret, changed, bits, count, err;
 746         unsigned long flags;
 747
 748         switch (cmd)
 749         {
 750                 case SNDCTL_DSP_SUBDIVIDE:
 751                         ret = 0;
 752                         if (get_user(fact, (int __user *)arg))
 753                                 return -EFAULT;
 754                         if (audio_devs[dev]->open_mode & OPEN_WRITE)
 755                                 ret = dma_subdivide(dev, dmap_out, fact);
 756                         if (ret < 0)
 757                                 return ret;
 758                         if (audio_devs[dev]->open_mode != OPEN_WRITE ||
 759                                 (audio_devs[dev]->flags & DMA_DUPLEX &&
 760                                         audio_devs[dev]->open_mode & OPEN_READ))
 761                                 ret = dma_subdivide(dev, dmap_in, fact);
 762                         if (ret < 0)
 763                                 return ret;
 764                         break;
 765
 766                 case SNDCTL_DSP_GETISPACE:
 767                 case SNDCTL_DSP_GETOSPACE:
 768                         dmap = dmap_out;
 769                         if (cmd == SNDCTL_DSP_GETISPACE && !(audio_devs[dev]->open_mode & OPEN_READ))
 770                                 return -EINVAL;
 771                         if (cmd == SNDCTL_DSP_GETOSPACE && !(audio_devs[dev]->open_mode & OPEN_WRITE))
 772                                 return -EINVAL;
 773                         if (cmd == SNDCTL_DSP_GETISPACE && audio_devs[dev]->flags & DMA_DUPLEX)
 774                                 dmap = dmap_in;
 775                         if (dmap->mapping_flags & DMA_MAP_MAPPED)
 776                                 return -EINVAL;
 777                         if (!(dmap->flags & DMA_ALLOC_DONE))
 778                                 reorganize_buffers(dev, dmap, (cmd == SNDCTL_DSP_GETISPACE));
 779                         info.fragstotal = dmap->nbufs;
 780                         if (cmd == SNDCTL_DSP_GETISPACE)
 781                                 info.fragments = dmap->qlen;
 782                         else
 783                         {
 784                                 if (!DMAbuf_space_in_queue(dev))
 785                                         info.fragments = 0;
 786                                 else
 787                                 {
 788                                         info.fragments = DMAbuf_space_in_queue(dev);
 789                                         if (audio_devs[dev]->d->local_qlen)
 790                                         {
 791                                                 int tmp = audio_devs[dev]->d->local_qlen(dev);
 792                                                 if (tmp && info.fragments)
 793                                                         tmp--;  /*
 794                                                                  * This buffer has been counted twice
 795                                                                  */
 796                                                 info.fragments -= tmp;
 797                                         }
 798                                 }
 799                         }
 800                         if (info.fragments < 0)
 801                                 info.fragments = 0;
 802                         else if (info.fragments > dmap->nbufs)
 803                                 info.fragments = dmap->nbufs;
 804
 805                         info.fragsize = dmap->fragment_size;
 806                         info.bytes = info.fragments * dmap->fragment_size;
 807
 808                         if (cmd == SNDCTL_DSP_GETISPACE && dmap->qlen)
 809                                 info.bytes -= dmap->counts[dmap->qhead];
 810                         else
 811                         {
 812                                 info.fragments = info.bytes / dmap->fragment_size;
 813                                 info.bytes -= dmap->user_counter % dmap->fragment_size;
 814                         }
 815                         if (copy_to_user(arg, &info, sizeof(info)))
 816                                 return -EFAULT;
 817                         return 0;
 818
 819                 case SNDCTL_DSP_SETTRIGGER:
 820                         if (get_user(bits, (int __user *)arg))
 821                                 return -EFAULT;
 822                         bits &= audio_devs[dev]->open_mode;
 823                         if (audio_devs[dev]->d->trigger == NULL)
 824                                 return -EINVAL;
 825                         if (!(audio_devs[dev]->flags & DMA_DUPLEX) && (bits & PCM_ENABLE_INPUT) &&
 826                                 (bits & PCM_ENABLE_OUTPUT))
 827                                 return -EINVAL;
 828
 829                         if (bits & PCM_ENABLE_INPUT)
 830                         {
 831                                 spin_lock_irqsave(&dmap_in->lock,flags);
 832                                 changed = (audio_devs[dev]->enable_bits ^ bits) & PCM_ENABLE_INPUT;
 833                                 if (changed && audio_devs[dev]->go)
 834                                 {
 835                                         reorganize_buffers(dev, dmap_in, 1);
 836                                         if ((err = audio_devs[dev]->d->prepare_for_input(dev,
 837                                                      dmap_in->fragment_size, dmap_in->nbufs)) < 0) {
 838                                                 spin_unlock_irqrestore(&dmap_in->lock,flags);
 839                                                 return -err;
 840                                         }
 841                                         dmap_in->dma_mode = DMODE_INPUT;
 842                                         audio_devs[dev]->enable_bits |= PCM_ENABLE_INPUT;
 843                                         DMAbuf_activate_recording(dev, dmap_in);
 844                                 } else
 845                                         audio_devs[dev]->enable_bits &= ~PCM_ENABLE_INPUT;
 846                                 spin_unlock_irqrestore(&dmap_in->lock,flags);
 847                         }
 848                         if (bits & PCM_ENABLE_OUTPUT)
 849                         {
 850                                 spin_lock_irqsave(&dmap_out->lock,flags);
 851                                 changed = (audio_devs[dev]->enable_bits ^ bits) & PCM_ENABLE_OUTPUT;
 852                                 if (changed &&
 853                                     (dmap_out->mapping_flags & DMA_MAP_MAPPED || dmap_out->qlen > 0) &&
 854                                     audio_devs[dev]->go)
 855                                 {
 856                                         if (!(dmap_out->flags & DMA_ALLOC_DONE))
 857                                                 reorganize_buffers(dev, dmap_out, 0);
 858                                         dmap_out->dma_mode = DMODE_OUTPUT;
 859                                         audio_devs[dev]->enable_bits |= PCM_ENABLE_OUTPUT;
 860                                         dmap_out->counts[dmap_out->qhead] = dmap_out->fragment_size;
 861                                         DMAbuf_launch_output(dev, dmap_out);
 862                                 } else
 863                                         audio_devs[dev]->enable_bits &= ~PCM_ENABLE_OUTPUT;
 864                                 spin_unlock_irqrestore(&dmap_out->lock,flags);
 865                         }
 866 #if 0
 867                         if (changed && audio_devs[dev]->d->trigger)
 868                                 audio_devs[dev]->d->trigger(dev, bits * audio_devs[dev]->go);
 869 #endif
 870                         /* Falls through... */
 871
 872                 case SNDCTL_DSP_GETTRIGGER:
 873                         ret = audio_devs[dev]->enable_bits;
 874                         break;
 875
 876                 case SNDCTL_DSP_SETSYNCRO:
 877                         if (!audio_devs[dev]->d->trigger)
 878                                 return -EINVAL;
 879                         audio_devs[dev]->d->trigger(dev, 0);
 880                         audio_devs[dev]->go = 0;
 881                         return 0;
 882
 883                 case SNDCTL_DSP_GETIPTR:
 884                         if (!(audio_devs[dev]->open_mode & OPEN_READ))
 885                                 return -EINVAL;
 886                         spin_lock_irqsave(&dmap_in->lock,flags);
 887                         cinfo.bytes = dmap_in->byte_counter;
 888                         cinfo.ptr = DMAbuf_get_buffer_pointer(dev, dmap_in, DMODE_INPUT) & ~3;
 889                         if (cinfo.ptr < dmap_in->fragment_size && dmap_in->qtail != 0)
 890                                 cinfo.bytes += dmap_in->bytes_in_use;   /* Pointer wrap not handled yet */
 891                         cinfo.blocks = dmap_in->qlen;
 892                         cinfo.bytes += cinfo.ptr;
 893                         if (dmap_in->mapping_flags & DMA_MAP_MAPPED)
 894                                 dmap_in->qlen = 0;      /* Reset interrupt counter */
 895                         spin_unlock_irqrestore(&dmap_in->lock,flags);
 896                         if (copy_to_user(arg, &cinfo, sizeof(cinfo)))
 897                                 return -EFAULT;
 898                         return 0;
 899
 900                 case SNDCTL_DSP_GETOPTR:
 901                         if (!(audio_devs[dev]->open_mode & OPEN_WRITE))
 902                                 return -EINVAL;
 903
 904                         spin_lock_irqsave(&dmap_out->lock,flags);
 905                         cinfo.bytes = dmap_out->byte_counter;
 906                         cinfo.ptr = DMAbuf_get_buffer_pointer(dev, dmap_out, DMODE_OUTPUT) & ~3;
 907                         if (cinfo.ptr < dmap_out->fragment_size && dmap_out->qhead != 0)
 908                                 cinfo.bytes += dmap_out->bytes_in_use;  /* Pointer wrap not handled yet */
 909                         cinfo.blocks = dmap_out->qlen;
 910                         cinfo.bytes += cinfo.ptr;
 911                         if (dmap_out->mapping_flags & DMA_MAP_MAPPED)
 912                                 dmap_out->qlen = 0;     /* Reset interrupt counter */
 913                         spin_unlock_irqrestore(&dmap_out->lock,flags);
 914                         if (copy_to_user(arg, &cinfo, sizeof(cinfo)))
 915                                 return -EFAULT;
 916                         return 0;
 917
 918                 case SNDCTL_DSP_GETODELAY:
 919                         if (!(audio_devs[dev]->open_mode & OPEN_WRITE))
 920                                 return -EINVAL;
 921                         if (!(dmap_out->flags & DMA_ALLOC_DONE))
 922                         {
 923                                 ret=0;
 924                                 break;
 925                         }
 926                         spin_lock_irqsave(&dmap_out->lock,flags);
 927                         /* Compute number of bytes that have been played */
 928                         count = DMAbuf_get_buffer_pointer (dev, dmap_out, DMODE_OUTPUT);
 929                         if (count < dmap_out->fragment_size && dmap_out->qhead != 0)
 930                                 count += dmap_out->bytes_in_use;        /* Pointer wrap not handled yet */
 931                         count += dmap_out->byte_counter;
 932                         /* Substract current count from the number of bytes written by app */
 933                         count = dmap_out->user_counter - count;
 934                         if (count < 0)
 935                                 count = 0;
 936                         spin_unlock_irqrestore(&dmap_out->lock,flags);
 937                         ret = count;
 938                         break;
 939
 940                 case SNDCTL_DSP_POST:
 941                         if (audio_devs[dev]->dmap_out->qlen > 0)
 942                                 if (!(audio_devs[dev]->dmap_out->flags & DMA_ACTIVE))
 943                                         DMAbuf_launch_output(dev, audio_devs[dev]->dmap_out);
 944                         return 0;
 945
 946                 case SNDCTL_DSP_GETBLKSIZE:
 947                         dmap = dmap_out;
 948                         if (audio_devs[dev]->open_mode & OPEN_WRITE)
 949                                 reorganize_buffers(dev, dmap_out, (audio_devs[dev]->open_mode == OPEN_READ));
 950                         if (audio_devs[dev]->open_mode == OPEN_READ ||
 951                             (audio_devs[dev]->flags & DMA_DUPLEX &&
 952                              audio_devs[dev]->open_mode & OPEN_READ))
 953                                 reorganize_buffers(dev, dmap_in, (audio_devs[dev]->open_mode == OPEN_READ));
 954                         if (audio_devs[dev]->open_mode == OPEN_READ)
 955                                 dmap = dmap_in;
 956                         ret = dmap->fragment_size;
 957                         break;
 958
 959                 case SNDCTL_DSP_SETFRAGMENT:
 960                         ret = 0;
 961                         if (get_user(fact, (int __user *)arg))
 962                                 return -EFAULT;
 963                         if (audio_devs[dev]->open_mode & OPEN_WRITE)
 964                                 ret = dma_set_fragment(dev, dmap_out, fact);
 965                         if (ret < 0)
 966                                 return ret;
 967                         if (audio_devs[dev]->open_mode == OPEN_READ ||
 968                             (audio_devs[dev]->flags & DMA_DUPLEX &&
 969                              audio_devs[dev]->open_mode & OPEN_READ))
 970                                 ret = dma_set_fragment(dev, dmap_in, fact);
 971                         if (ret < 0)
 972                                 return ret;
 973                         if (!arg) /* don't know what this is good for, but preserve old semantics */
 974                                 return 0;
 975                         break;
 976
 977                 default:
 978                         if (!audio_devs[dev]->d->ioctl)
 979                                 return -EINVAL;
 980                         return audio_devs[dev]->d->ioctl(dev, cmd, arg);
 981         }
 982         return put_user(ret, (int __user *)arg);
 983 }