sound/oss/soundcard.c

   1 /*
   2  * linux/sound/oss/soundcard.c
   3  *
   4  * Sound card driver for Linux
   5  *
   6  *
   7  * Copyright (C) by Hannu Savolainen 1993-1997
   8  *
   9  * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
  10  * Version 2 (June 1991). See the "COPYING" file distributed with this software
  11  * for more info.
  12  *
  13  *
  14  * Thomas Sailer     : ioctl code reworked (vmalloc/vfree removed)
  15  *                   integrated sound_switch.c
  16  * Stefan Reinauer   : integrated /proc/sound (equals to /dev/sndstat,
  17  *                   which should disappear in the near future)
  18  * Eric Dumas        : devfs support (22-Jan-98) <dumas@linux.eu.org> with
  19  *                   fixups by C. Scott Ananian <cananian@alumni.princeton.edu>
  20  * Richard Gooch     : moved common (non OSS-specific) devices to sound_core.c
  21  * Rob Riggs         : Added persistent DMA buffers support (1998/10/17)
  22  * Christoph Hellwig : Some cleanup work (2000/03/01)
  23  */
  24
  25
  26 #include "sound_config.h"
  27 #include <linux/init.h>
  28 #include <linux/types.h>
  29 #include <linux/errno.h>
  30 #include <linux/signal.h>
  31 #include <linux/fcntl.h>
  32 #include <linux/ctype.h>
  33 #include <linux/stddef.h>
  34 #include <linux/kmod.h>
  35 #include <linux/kernel.h>
  36 #include <asm/dma.h>
  37 #include <asm/io.h>
  38 #include <linux/wait.h>
  39 #include <linux/ioport.h>
  40 #include <linux/major.h>
  41 #include <linux/delay.h>
  42 #include <linux/proc_fs.h>
  43 #include <linux/smp_lock.h>
  44 #include <linux/module.h>
  45 #include <linux/mm.h>
  46 #include <linux/device.h>
  47
  48 /*
  49  * This ought to be moved into include/asm/dma.h
  50  */
  51 #ifndef valid_dma
  52 #define valid_dma(n) ((n) >= 0 && (n) < MAX_DMA_CHANNELS && (n) != 4)
  53 #endif
  54
  55 /*
  56  * Table for permanently allocated memory (used when unloading the module)
  57  */
  58 void *          sound_mem_blocks[MAX_MEM_BLOCKS];
  59 int             sound_nblocks = 0;
  60
  61 /* Persistent DMA buffers */
  62 #ifdef CONFIG_SOUND_DMAP
  63 int             sound_dmap_flag = 1;
  64 #else
  65 int             sound_dmap_flag = 0;
  66 #endif
  67
  68 static char     dma_alloc_map[MAX_DMA_CHANNELS];
  69
  70 #define DMA_MAP_UNAVAIL         0
  71 #define DMA_MAP_FREE            1
  72 #define DMA_MAP_BUSY            2
  73
  74
  75 unsigned long seq_time = 0;     /* Time for /dev/sequencer */
  76 extern struct class *sound_class;
  77
  78 /*
  79  * Table for configurable mixer volume handling
  80  */
  81 static mixer_vol_table mixer_vols[MAX_MIXER_DEV];
  82 static int num_mixer_volumes;
  83
  84 int *load_mixer_volumes(char *name, int *levels, int present)
  85 {
  86         int             i, n;
  87
  88         for (i = 0; i < num_mixer_volumes; i++) {
  89                 if (strcmp(name, mixer_vols[i].name) == 0) {
  90                         if (present)
  91                                 mixer_vols[i].num = i;
  92                         return mixer_vols[i].levels;
  93                 }
  94         }
  95         if (num_mixer_volumes >= MAX_MIXER_DEV) {
  96                 printk(KERN_ERR "Sound: Too many mixers (%s)\n", name);
  97                 return levels;
  98         }
  99         n = num_mixer_volumes++;
 100
 101         strcpy(mixer_vols[n].name, name);
 102
 103         if (present)
 104                 mixer_vols[n].num = n;
 105         else
 106                 mixer_vols[n].num = -1;
 107
 108         for (i = 0; i < 32; i++)
 109                 mixer_vols[n].levels[i] = levels[i];
 110         return mixer_vols[n].levels;
 111 }
 112 EXPORT_SYMBOL(load_mixer_volumes);
 113
 114 static int set_mixer_levels(void __user * arg)
 115 {
 116         /* mixer_vol_table is 174 bytes, so IMHO no reason to not allocate it on the stack */
 117         mixer_vol_table buf;
 118
 119         if (__copy_from_user(&buf, arg, sizeof(buf)))
 120                 return -EFAULT;
 121         load_mixer_volumes(buf.name, buf.levels, 0);
 122         if (__copy_to_user(arg, &buf, sizeof(buf)))
 123                 return -EFAULT;
 124         return 0;
 125 }
 126
 127 static int get_mixer_levels(void __user * arg)
 128 {
 129         int n;
 130
 131         if (__get_user(n, (int __user *)(&(((mixer_vol_table __user *)arg)->num))))
 132                 return -EFAULT;
 133         if (n < 0 || n >= num_mixer_volumes)
 134                 return -EINVAL;
 135         if (__copy_to_user(arg, &mixer_vols[n], sizeof(mixer_vol_table)))
 136                 return -EFAULT;
 137         return 0;
 138 }
 139
 140 /* 4K page size but our output routines use some slack for overruns */
 141 #define PROC_BLOCK_SIZE (3*1024)
 142
 143 static ssize_t sound_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 144 {
 145         int dev = iminor(file->f_path.dentry->d_inode);
 146         int ret = -EINVAL;
 147
 148         /*
 149          *      The OSS drivers aren't remotely happy without this locking,
 150          *      and unless someone fixes them when they are about to bite the
 151          *      big one anyway, we might as well bandage here..
 152          */
 153
 154         lock_kernel();
 155
 156         DEB(printk("sound_read(dev=%d, count=%d)\n", dev, count));
 157         switch (dev & 0x0f) {
 158         case SND_DEV_DSP:
 159         case SND_DEV_DSP16:
 160         case SND_DEV_AUDIO:
 161                 ret = audio_read(dev, file, buf, count);
 162                 break;
 163
 164         case SND_DEV_SEQ:
 165         case SND_DEV_SEQ2:
 166                 ret = sequencer_read(dev, file, buf, count);
 167                 break;
 168
 169         case SND_DEV_MIDIN:
 170                 ret = MIDIbuf_read(dev, file, buf, count);
 171         }
 172         unlock_kernel();
 173         return ret;
 174 }
 175
 176 static ssize_t sound_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
 177 {
 178         int dev = iminor(file->f_path.dentry->d_inode);
 179         int ret = -EINVAL;
 180
 181         lock_kernel();
 182         DEB(printk("sound_write(dev=%d, count=%d)\n", dev, count));
 183         switch (dev & 0x0f) {
 184         case SND_DEV_SEQ:
 185         case SND_DEV_SEQ2:
 186                 ret =  sequencer_write(dev, file, buf, count);
 187                 break;
 188
 189         case SND_DEV_DSP:
 190         case SND_DEV_DSP16:
 191         case SND_DEV_AUDIO:
 192                 ret = audio_write(dev, file, buf, count);
 193                 break;
 194
 195         case SND_DEV_MIDIN:
 196                 ret =  MIDIbuf_write(dev, file, buf, count);
 197                 break;
 198         }
 199         unlock_kernel();
 200         return ret;
 201 }
 202
 203 static int sound_open(struct inode *inode, struct file *file)
 204 {
 205         int dev = iminor(inode);
 206         int retval;
 207
 208         DEB(printk("sound_open(dev=%d)\n", dev));
 209         if ((dev >= SND_NDEVS) || (dev < 0)) {
 210                 printk(KERN_ERR "Invalid minor device %d\n", dev);
 211                 return -ENXIO;
 212         }
 213         lock_kernel();
 214         switch (dev & 0x0f) {
 215         case SND_DEV_CTL:
 216                 dev >>= 4;
 217                 if (dev >= 0 && dev < MAX_MIXER_DEV && mixer_devs[dev] == NULL) {
 218                         request_module("mixer%d", dev);
 219                 }
 220                 retval = -ENXIO;
 221                 if (dev && (dev >= num_mixers || mixer_devs[dev] == NULL))
 222                         break;
 223
 224                 if (!try_module_get(mixer_devs[dev]->owner))
 225                         break;
 226
 227                 retval = 0;
 228                 break;
 229
 230         case SND_DEV_SEQ:
 231         case SND_DEV_SEQ2:
 232                 retval = sequencer_open(dev, file);
 233                 break;
 234
 235         case SND_DEV_MIDIN:
 236                 retval = MIDIbuf_open(dev, file);
 237                 break;
 238
 239         case SND_DEV_DSP:
 240         case SND_DEV_DSP16:
 241         case SND_DEV_AUDIO:
 242                 retval = audio_open(dev, file);
 243                 break;
 244
 245         default:
 246                 printk(KERN_ERR "Invalid minor device %d\n", dev);
 247                 retval = -ENXIO;
 248         }
 249
 250         unlock_kernel();
 251         return 0;
 252 }
 253
 254 static int sound_release(struct inode *inode, struct file *file)
 255 {
 256         int dev = iminor(inode);
 257
 258         lock_kernel();
 259         DEB(printk("sound_release(dev=%d)\n", dev));
 260         switch (dev & 0x0f) {
 261         case SND_DEV_CTL:
 262                 module_put(mixer_devs[dev >> 4]->owner);
 263                 break;
 264
 265         case SND_DEV_SEQ:
 266         case SND_DEV_SEQ2:
 267                 sequencer_release(dev, file);
 268                 break;
 269
 270         case SND_DEV_MIDIN:
 271                 MIDIbuf_release(dev, file);
 272                 break;
 273
 274         case SND_DEV_DSP:
 275         case SND_DEV_DSP16:
 276         case SND_DEV_AUDIO:
 277                 audio_release(dev, file);
 278                 break;
 279
 280         default:
 281                 printk(KERN_ERR "Sound error: Releasing unknown device 0x%02x\n", dev);
 282         }
 283         unlock_kernel();
 284
 285         return 0;
 286 }
 287
 288 static int get_mixer_info(int dev, void __user *arg)
 289 {
 290         mixer_info info;
 291         memset(&info, 0, sizeof(info));
 292         strlcpy(info.id, mixer_devs[dev]->id, sizeof(info.id));
 293         strlcpy(info.name, mixer_devs[dev]->name, sizeof(info.name));
 294         info.modify_counter = mixer_devs[dev]->modify_counter;
 295         if (__copy_to_user(arg, &info,  sizeof(info)))
 296                 return -EFAULT;
 297         return 0;
 298 }
 299
 300 static int get_old_mixer_info(int dev, void __user *arg)
 301 {
 302         _old_mixer_info info;
 303         memset(&info, 0, sizeof(info));
 304         strlcpy(info.id, mixer_devs[dev]->id, sizeof(info.id));
 305         strlcpy(info.name, mixer_devs[dev]->name, sizeof(info.name));
 306         if (copy_to_user(arg, &info,  sizeof(info)))
 307                 return -EFAULT;
 308         return 0;
 309 }
 310
 311 static int sound_mixer_ioctl(int mixdev, unsigned int cmd, void __user *arg)
 312 {
 313         if (mixdev < 0 || mixdev >= MAX_MIXER_DEV)
 314                 return -ENXIO;
 315         /* Try to load the mixer... */
 316         if (mixer_devs[mixdev] == NULL) {
 317                 request_module("mixer%d", mixdev);
 318         }
 319         if (mixdev >= num_mixers || !mixer_devs[mixdev])
 320                 return -ENXIO;
 321         if (cmd == SOUND_MIXER_INFO)
 322                 return get_mixer_info(mixdev, arg);
 323         if (cmd == SOUND_OLD_MIXER_INFO)
 324                 return get_old_mixer_info(mixdev, arg);
 325         if (_SIOC_DIR(cmd) & _SIOC_WRITE)
 326                 mixer_devs[mixdev]->modify_counter++;
 327         if (!mixer_devs[mixdev]->ioctl)
 328                 return -EINVAL;
 329         return mixer_devs[mixdev]->ioctl(mixdev, cmd, arg);
 330 }
 331
 332 static long sound_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 333 {
 334         int len = 0, dtype;
 335         int dev = iminor(file->f_dentry->d_inode);
 336         long ret = -EINVAL;
 337         void __user *p = (void __user *)arg;
 338
 339         if (_SIOC_DIR(cmd) != _SIOC_NONE && _SIOC_DIR(cmd) != 0) {
 340                 /*
 341                  * Have to validate the address given by the process.
 342                  */
 343                 len = _SIOC_SIZE(cmd);
 344                 if (len < 1 || len > 65536 || !p)
 345                         return -EFAULT;
 346                 if (_SIOC_DIR(cmd) & _SIOC_WRITE)
 347                         if (!access_ok(VERIFY_READ, p, len))
 348                                 return -EFAULT;
 349                 if (_SIOC_DIR(cmd) & _SIOC_READ)
 350                         if (!access_ok(VERIFY_WRITE, p, len))
 351                                 return -EFAULT;
 352         }
 353         DEB(printk("sound_ioctl(dev=%d, cmd=0x%x, arg=0x%x)\n", dev, cmd, arg));
 354         if (cmd == OSS_GETVERSION)
 355                 return __put_user(SOUND_VERSION, (int __user *)p);
 356
 357         lock_kernel();
 358         if (_IOC_TYPE(cmd) == 'M' && num_mixers > 0 &&   /* Mixer ioctl */
 359             (dev & 0x0f) != SND_DEV_CTL) {
 360                 dtype = dev & 0x0f;
 361                 switch (dtype) {
 362                 case SND_DEV_DSP:
 363                 case SND_DEV_DSP16:
 364                 case SND_DEV_AUDIO:
 365                         ret = sound_mixer_ioctl(audio_devs[dev >> 4]->mixer_dev,
 366                                                  cmd, p);
 367                         break;
 368                 default:
 369                         ret = sound_mixer_ioctl(dev >> 4, cmd, p);
 370                         break;
 371                 }
 372                 unlock_kernel();
 373                 return ret;
 374         }
 375
 376         switch (dev & 0x0f) {
 377         case SND_DEV_CTL:
 378                 if (cmd == SOUND_MIXER_GETLEVELS)
 379                         ret = get_mixer_levels(p);
 380                 else if (cmd == SOUND_MIXER_SETLEVELS)
 381                         ret = set_mixer_levels(p);
 382                 else
 383                         ret = sound_mixer_ioctl(dev >> 4, cmd, p);
 384                 break;
 385
 386         case SND_DEV_SEQ:
 387         case SND_DEV_SEQ2:
 388                 ret = sequencer_ioctl(dev, file, cmd, p);
 389                 break;
 390
 391         case SND_DEV_DSP:
 392         case SND_DEV_DSP16:
 393         case SND_DEV_AUDIO:
 394                 ret = audio_ioctl(dev, file, cmd, p);
 395                 break;
 396
 397         case SND_DEV_MIDIN:
 398                 ret = MIDIbuf_ioctl(dev, file, cmd, p);
 399                 break;
 400
 401         }
 402         unlock_kernel();
 403         return ret;
 404 }
 405
 406 static unsigned int sound_poll(struct file *file, poll_table * wait)
 407 {
 408         struct inode *inode = file->f_path.dentry->d_inode;
 409         int dev = iminor(inode);
 410
 411         DEB(printk("sound_poll(dev=%d)\n", dev));
 412         switch (dev & 0x0f) {
 413         case SND_DEV_SEQ:
 414         case SND_DEV_SEQ2:
 415                 return sequencer_poll(dev, file, wait);
 416
 417         case SND_DEV_MIDIN:
 418                 return MIDIbuf_poll(dev, file, wait);
 419
 420         case SND_DEV_DSP:
 421         case SND_DEV_DSP16:
 422         case SND_DEV_AUDIO:
 423                 return DMAbuf_poll(file, dev >> 4, wait);
 424         }
 425         return 0;
 426 }
 427
 428 static int sound_mmap(struct file *file, struct vm_area_struct *vma)
 429 {
 430         int dev_class;
 431         unsigned long size;
 432         struct dma_buffparms *dmap = NULL;
 433         int dev = iminor(file->f_path.dentry->d_inode);
 434
 435         dev_class = dev & 0x0f;
 436         dev >>= 4;
 437
 438         if (dev_class != SND_DEV_DSP && dev_class != SND_DEV_DSP16 && dev_class != SND_DEV_AUDIO) {
 439                 printk(KERN_ERR "Sound: mmap() not supported for other than audio devices\n");
 440                 return -EINVAL;
 441         }
 442         lock_kernel();
 443         if (vma->vm_flags & VM_WRITE)   /* Map write and read/write to the output buf */
 444                 dmap = audio_devs[dev]->dmap_out;
 445         else if (vma->vm_flags & VM_READ)
 446                 dmap = audio_devs[dev]->dmap_in;
 447         else {
 448                 printk(KERN_ERR "Sound: Undefined mmap() access\n");
 449                 unlock_kernel();
 450                 return -EINVAL;
 451         }
 452
 453         if (dmap == NULL) {
 454                 printk(KERN_ERR "Sound: mmap() error. dmap == NULL\n");
 455                 unlock_kernel();
 456                 return -EIO;
 457         }
 458         if (dmap->raw_buf == NULL) {
 459                 printk(KERN_ERR "Sound: mmap() called when raw_buf == NULL\n");
 460                 unlock_kernel();
 461                 return -EIO;
 462         }
 463         if (dmap->mapping_flags) {
 464                 printk(KERN_ERR "Sound: mmap() called twice for the same DMA buffer\n");
 465                 unlock_kernel();
 466                 return -EIO;
 467         }
 468         if (vma->vm_pgoff != 0) {
 469                 printk(KERN_ERR "Sound: mmap() offset must be 0.\n");
 470                 unlock_kernel();
 471                 return -EINVAL;
 472         }
 473         size = vma->vm_end - vma->vm_start;
 474
 475         if (size != dmap->bytes_in_use) {
 476                 printk(KERN_WARNING "Sound: mmap() size = %ld. Should be %d\n", size, dmap->bytes_in_use);
 477         }
 478         if (remap_pfn_range(vma, vma->vm_start,
 479                         virt_to_phys(dmap->raw_buf) >> PAGE_SHIFT,
 480                         vma->vm_end - vma->vm_start, vma->vm_page_prot)) {
 481                 unlock_kernel();
 482                 return -EAGAIN;
 483         }
 484
 485         dmap->mapping_flags |= DMA_MAP_MAPPED;
 486
 487         if( audio_devs[dev]->d->mmap)
 488                 audio_devs[dev]->d->mmap(dev);
 489
 490         memset(dmap->raw_buf,
 491                dmap->neutral_byte,
 492                dmap->bytes_in_use);
 493         unlock_kernel();
 494         return 0;
 495 }
 496
 497 const struct file_operations oss_sound_fops = {
 498         .owner          = THIS_MODULE,
 499         .llseek         = no_llseek,
 500         .read           = sound_read,
 501         .write          = sound_write,
 502         .poll           = sound_poll,
 503         .unlocked_ioctl = sound_ioctl,
 504         .mmap           = sound_mmap,
 505         .open           = sound_open,
 506         .release        = sound_release,
 507 };
 508
 509 /*
 510  *      Create the required special subdevices
 511  */
 512
 513 static int create_special_devices(void)
 514 {
 515         int seq1,seq2;
 516         seq1=register_sound_special(&oss_sound_fops, 1);
 517         if(seq1==-1)
 518                 goto bad;
 519         seq2=register_sound_special(&oss_sound_fops, 8);
 520         if(seq2!=-1)
 521                 return 0;
 522         unregister_sound_special(1);
 523 bad:
 524         return -1;
 525 }
 526
 527
 528 /* These device names follow the official Linux device list,
 529  * Documentation/devices.txt.  Let us know if there are other
 530  * common names we should support for compatibility.
 531  * Only those devices not created by the generic code in sound_core.c are
 532  * registered here.
 533  */
 534 static const struct {
 535         unsigned short minor;
 536         char *name;
 537         umode_t mode;
 538         int *num;
 539 } dev_list[] = { /* list of minor devices */
 540 /* seems to be some confusion here -- this device is not in the device list */
 541         {SND_DEV_DSP16,     "dspW",      S_IWUGO | S_IRUSR | S_IRGRP,
 542          &num_audiodevs},
 543         {SND_DEV_AUDIO,     "audio",     S_IWUGO | S_IRUSR | S_IRGRP,
 544          &num_audiodevs},
 545 };
 546
 547 static int dmabuf;
 548 static int dmabug;
 549
 550 module_param(dmabuf, int, 0444);
 551 module_param(dmabug, int, 0444);
 552
 553 static int __init oss_init(void)
 554 {
 555         int             err;
 556         int i, j;
 557
 558 #ifdef CONFIG_PCI
 559         if(dmabug)
 560                 isa_dma_bridge_buggy = dmabug;
 561 #endif
 562
 563         err = create_special_devices();
 564         if (err) {
 565                 printk(KERN_ERR "sound: driver already loaded/included in kernel\n");
 566                 return err;
 567         }
 568
 569         /* Protecting the innocent */
 570         sound_dmap_flag = (dmabuf > 0 ? 1 : 0);
 571
 572         for (i = 0; i < ARRAY_SIZE(dev_list); i++) {
 573                 device_create(sound_class, NULL,
 574                               MKDEV(SOUND_MAJOR, dev_list[i].minor), NULL,
 575                               "%s", dev_list[i].name);
 576
 577                 if (!dev_list[i].num)
 578                         continue;
 579
 580                 for (j = 1; j < *dev_list[i].num; j++)
 581                         device_create(sound_class, NULL,
 582                                       MKDEV(SOUND_MAJOR,
 583                                             dev_list[i].minor + (j*0x10)),
 584                                       NULL, "%s%d", dev_list[i].name, j);
 585         }
 586
 587         if (sound_nblocks >= MAX_MEM_BLOCKS - 1)
 588                 printk(KERN_ERR "Sound warning: Deallocation table was too small.\n");
 589
 590         return 0;
 591 }
 592
 593 static void __exit oss_cleanup(void)
 594 {
 595         int i, j;
 596
 597         for (i = 0; i < ARRAY_SIZE(dev_list); i++) {
 598                 device_destroy(sound_class, MKDEV(SOUND_MAJOR, dev_list[i].minor));
 599                 if (!dev_list[i].num)
 600                         continue;
 601                 for (j = 1; j < *dev_list[i].num; j++)
 602                         device_destroy(sound_class, MKDEV(SOUND_MAJOR, dev_list[i].minor + (j*0x10)));
 603         }
 604
 605         unregister_sound_special(1);
 606         unregister_sound_special(8);
 607
 608         sound_stop_timer();
 609
 610         sequencer_unload();
 611
 612         for (i = 0; i < MAX_DMA_CHANNELS; i++)
 613                 if (dma_alloc_map[i] != DMA_MAP_UNAVAIL) {
 614                         printk(KERN_ERR "Sound: Hmm, DMA%d was left allocated - fixed\n", i);
 615                         sound_free_dma(i);
 616                 }
 617
 618         for (i = 0; i < sound_nblocks; i++)
 619                 vfree(sound_mem_blocks[i]);
 620
 621 }
 622
 623 module_init(oss_init);
 624 module_exit(oss_cleanup);
 625 MODULE_LICENSE("GPL");
 626 MODULE_DESCRIPTION("OSS Sound subsystem");
 627 MODULE_AUTHOR("Hannu Savolainen, et al.");
 628
 629
 630 int sound_alloc_dma(int chn, char *deviceID)
 631 {
 632         int err;
 633
 634         if ((err = request_dma(chn, deviceID)) != 0)
 635                 return err;
 636
 637         dma_alloc_map[chn] = DMA_MAP_FREE;
 638
 639         return 0;
 640 }
 641 EXPORT_SYMBOL(sound_alloc_dma);
 642
 643 int sound_open_dma(int chn, char *deviceID)
 644 {
 645         if (!valid_dma(chn)) {
 646                 printk(KERN_ERR "sound_open_dma: Invalid DMA channel %d\n", chn);
 647                 return 1;
 648         }
 649
 650         if (dma_alloc_map[chn] != DMA_MAP_FREE) {
 651                 printk("sound_open_dma: DMA channel %d busy or not allocated (%d)\n", chn, dma_alloc_map[chn]);
 652                 return 1;
 653         }
 654         dma_alloc_map[chn] = DMA_MAP_BUSY;
 655         return 0;
 656 }
 657 EXPORT_SYMBOL(sound_open_dma);
 658
 659 void sound_free_dma(int chn)
 660 {
 661         if (dma_alloc_map[chn] == DMA_MAP_UNAVAIL) {
 662                 /* printk( "sound_free_dma: Bad access to DMA channel %d\n",  chn); */
 663                 return;
 664         }
 665         free_dma(chn);
 666         dma_alloc_map[chn] = DMA_MAP_UNAVAIL;
 667 }
 668 EXPORT_SYMBOL(sound_free_dma);
 669
 670 void sound_close_dma(int chn)
 671 {
 672         if (dma_alloc_map[chn] != DMA_MAP_BUSY) {
 673                 printk(KERN_ERR "sound_close_dma: Bad access to DMA channel %d\n", chn);
 674                 return;
 675         }
 676         dma_alloc_map[chn] = DMA_MAP_FREE;
 677 }
 678 EXPORT_SYMBOL(sound_close_dma);
 679
 680 static void do_sequencer_timer(unsigned long dummy)
 681 {
 682         sequencer_timer(0);
 683 }
 684
 685
 686 static DEFINE_TIMER(seq_timer, do_sequencer_timer, 0, 0);
 687
 688 void request_sound_timer(int count)
 689 {
 690         extern unsigned long seq_time;
 691
 692         if (count < 0) {
 693                 seq_timer.expires = (-count) + jiffies;
 694                 add_timer(&seq_timer);
 695                 return;
 696         }
 697         count += seq_time;
 698
 699         count -= jiffies;
 700
 701         if (count < 1)
 702                 count = 1;
 703
 704         seq_timer.expires = (count) + jiffies;
 705         add_timer(&seq_timer);
 706 }
 707
 708 void sound_stop_timer(void)
 709 {
 710         del_timer(&seq_timer);
 711 }
 712
 713 void conf_printf(char *name, struct address_info *hw_config)
 714 {
 715 #ifndef CONFIG_SOUND_TRACEINIT
 716         return;
 717 #else
 718         printk("<%s> at 0x%03x", name, hw_config->io_base);
 719
 720         if (hw_config->irq)
 721                 printk(" irq %d", (hw_config->irq > 0) ? hw_config->irq : -hw_config->irq);
 722
 723         if (hw_config->dma != -1 || hw_config->dma2 != -1)
 724         {
 725                 printk(" dma %d", hw_config->dma);
 726                 if (hw_config->dma2 != -1)
 727                         printk(",%d", hw_config->dma2);
 728         }
 729         printk("\n");
 730 #endif
 731 }
 732 EXPORT_SYMBOL(conf_printf);
 733
 734 void conf_printf2(char *name, int base, int irq, int dma, int dma2)
 735 {
 736 #ifndef CONFIG_SOUND_TRACEINIT
 737         return;
 738 #else
 739         printk("<%s> at 0x%03x", name, base);
 740
 741         if (irq)
 742                 printk(" irq %d", (irq > 0) ? irq : -irq);
 743
 744         if (dma != -1 || dma2 != -1)
 745         {
 746                   printk(" dma %d", dma);
 747                   if (dma2 != -1)
 748                           printk(",%d", dma2);
 749         }
 750         printk("\n");
 751 #endif
 752 }
 753 EXPORT_SYMBOL(conf_printf2);
 754