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