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[1024];
  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 int sound_ioctl(struct inode *inode, struct file *file,
 332                        unsigned int cmd, unsigned long arg)
 333 {
 334         int len = 0, dtype;
 335         int dev = iminor(inode);
 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         if (_IOC_TYPE(cmd) == 'M' && num_mixers > 0 &&   /* Mixer ioctl */
 357             (dev & 0x0f) != SND_DEV_CTL) {
 358                 dtype = dev & 0x0f;
 359                 switch (dtype) {
 360                 case SND_DEV_DSP:
 361                 case SND_DEV_DSP16:
 362                 case SND_DEV_AUDIO:
 363                         return sound_mixer_ioctl(audio_devs[dev >> 4]->mixer_dev,
 364                                                  cmd, p);
 365
 366                 default:
 367                         return sound_mixer_ioctl(dev >> 4, cmd, p);
 368                 }
 369         }
 370         switch (dev & 0x0f) {
 371         case SND_DEV_CTL:
 372                 if (cmd == SOUND_MIXER_GETLEVELS)
 373                         return get_mixer_levels(p);
 374                 if (cmd == SOUND_MIXER_SETLEVELS)
 375                         return set_mixer_levels(p);
 376                 return sound_mixer_ioctl(dev >> 4, cmd, p);
 377
 378         case SND_DEV_SEQ:
 379         case SND_DEV_SEQ2:
 380                 return sequencer_ioctl(dev, file, cmd, p);
 381
 382         case SND_DEV_DSP:
 383         case SND_DEV_DSP16:
 384         case SND_DEV_AUDIO:
 385                 return audio_ioctl(dev, file, cmd, p);
 386                 break;
 387
 388         case SND_DEV_MIDIN:
 389                 return MIDIbuf_ioctl(dev, file, cmd, p);
 390                 break;
 391
 392         }
 393         return -EINVAL;
 394 }
 395
 396 static unsigned int sound_poll(struct file *file, poll_table * wait)
 397 {
 398         struct inode *inode = file->f_path.dentry->d_inode;
 399         int dev = iminor(inode);
 400
 401         DEB(printk("sound_poll(dev=%d)\n", dev));
 402         switch (dev & 0x0f) {
 403         case SND_DEV_SEQ:
 404         case SND_DEV_SEQ2:
 405                 return sequencer_poll(dev, file, wait);
 406
 407         case SND_DEV_MIDIN:
 408                 return MIDIbuf_poll(dev, file, wait);
 409
 410         case SND_DEV_DSP:
 411         case SND_DEV_DSP16:
 412         case SND_DEV_AUDIO:
 413                 return DMAbuf_poll(file, dev >> 4, wait);
 414         }
 415         return 0;
 416 }
 417
 418 static int sound_mmap(struct file *file, struct vm_area_struct *vma)
 419 {
 420         int dev_class;
 421         unsigned long size;
 422         struct dma_buffparms *dmap = NULL;
 423         int dev = iminor(file->f_path.dentry->d_inode);
 424
 425         dev_class = dev & 0x0f;
 426         dev >>= 4;
 427
 428         if (dev_class != SND_DEV_DSP && dev_class != SND_DEV_DSP16 && dev_class != SND_DEV_AUDIO) {
 429                 printk(KERN_ERR "Sound: mmap() not supported for other than audio devices\n");
 430                 return -EINVAL;
 431         }
 432         lock_kernel();
 433         if (vma->vm_flags & VM_WRITE)   /* Map write and read/write to the output buf */
 434                 dmap = audio_devs[dev]->dmap_out;
 435         else if (vma->vm_flags & VM_READ)
 436                 dmap = audio_devs[dev]->dmap_in;
 437         else {
 438                 printk(KERN_ERR "Sound: Undefined mmap() access\n");
 439                 unlock_kernel();
 440                 return -EINVAL;
 441         }
 442
 443         if (dmap == NULL) {
 444                 printk(KERN_ERR "Sound: mmap() error. dmap == NULL\n");
 445                 unlock_kernel();
 446                 return -EIO;
 447         }
 448         if (dmap->raw_buf == NULL) {
 449                 printk(KERN_ERR "Sound: mmap() called when raw_buf == NULL\n");
 450                 unlock_kernel();
 451                 return -EIO;
 452         }
 453         if (dmap->mapping_flags) {
 454                 printk(KERN_ERR "Sound: mmap() called twice for the same DMA buffer\n");
 455                 unlock_kernel();
 456                 return -EIO;
 457         }
 458         if (vma->vm_pgoff != 0) {
 459                 printk(KERN_ERR "Sound: mmap() offset must be 0.\n");
 460                 unlock_kernel();
 461                 return -EINVAL;
 462         }
 463         size = vma->vm_end - vma->vm_start;
 464
 465         if (size != dmap->bytes_in_use) {
 466                 printk(KERN_WARNING "Sound: mmap() size = %ld. Should be %d\n", size, dmap->bytes_in_use);
 467         }
 468         if (remap_pfn_range(vma, vma->vm_start,
 469                         virt_to_phys(dmap->raw_buf) >> PAGE_SHIFT,
 470                         vma->vm_end - vma->vm_start, vma->vm_page_prot)) {
 471                 unlock_kernel();
 472                 return -EAGAIN;
 473         }
 474
 475         dmap->mapping_flags |= DMA_MAP_MAPPED;
 476
 477         if( audio_devs[dev]->d->mmap)
 478                 audio_devs[dev]->d->mmap(dev);
 479
 480         memset(dmap->raw_buf,
 481                dmap->neutral_byte,
 482                dmap->bytes_in_use);
 483         unlock_kernel();
 484         return 0;
 485 }
 486
 487 const struct file_operations oss_sound_fops = {
 488         .owner          = THIS_MODULE,
 489         .llseek         = no_llseek,
 490         .read           = sound_read,
 491         .write          = sound_write,
 492         .poll           = sound_poll,
 493         .ioctl          = sound_ioctl,
 494         .mmap           = sound_mmap,
 495         .open           = sound_open,
 496         .release        = sound_release,
 497 };
 498
 499 /*
 500  *      Create the required special subdevices
 501  */
 502
 503 static int create_special_devices(void)
 504 {
 505         int seq1,seq2;
 506         seq1=register_sound_special(&oss_sound_fops, 1);
 507         if(seq1==-1)
 508                 goto bad;
 509         seq2=register_sound_special(&oss_sound_fops, 8);
 510         if(seq2!=-1)
 511                 return 0;
 512         unregister_sound_special(1);
 513 bad:
 514         return -1;
 515 }
 516
 517
 518 /* These device names follow the official Linux device list,
 519  * Documentation/devices.txt.  Let us know if there are other
 520  * common names we should support for compatibility.
 521  * Only those devices not created by the generic code in sound_core.c are
 522  * registered here.
 523  */
 524 static const struct {
 525         unsigned short minor;
 526         char *name;
 527         umode_t mode;
 528         int *num;
 529 } dev_list[] = { /* list of minor devices */
 530 /* seems to be some confusion here -- this device is not in the device list */
 531         {SND_DEV_DSP16,     "dspW",      S_IWUGO | S_IRUSR | S_IRGRP,
 532          &num_audiodevs},
 533         {SND_DEV_AUDIO,     "audio",     S_IWUGO | S_IRUSR | S_IRGRP,
 534          &num_audiodevs},
 535 };
 536
 537 static int dmabuf;
 538 static int dmabug;
 539
 540 module_param(dmabuf, int, 0444);
 541 module_param(dmabug, int, 0444);
 542
 543 static int __init oss_init(void)
 544 {
 545         int             err;
 546         int i, j;
 547
 548 #ifdef CONFIG_PCI
 549         if(dmabug)
 550                 isa_dma_bridge_buggy = dmabug;
 551 #endif
 552
 553         err = create_special_devices();
 554         if (err) {
 555                 printk(KERN_ERR "sound: driver already loaded/included in kernel\n");
 556                 return err;
 557         }
 558
 559         /* Protecting the innocent */
 560         sound_dmap_flag = (dmabuf > 0 ? 1 : 0);
 561
 562         for (i = 0; i < ARRAY_SIZE(dev_list); i++) {
 563                 device_create(sound_class, NULL,
 564                               MKDEV(SOUND_MAJOR, dev_list[i].minor), NULL,
 565                               "%s", dev_list[i].name);
 566
 567                 if (!dev_list[i].num)
 568                         continue;
 569
 570                 for (j = 1; j < *dev_list[i].num; j++)
 571                         device_create(sound_class, NULL,
 572                                       MKDEV(SOUND_MAJOR,
 573                                             dev_list[i].minor + (j*0x10)),
 574                                       NULL, "%s%d", dev_list[i].name, j);
 575         }
 576
 577         if (sound_nblocks >= 1024)
 578                 printk(KERN_ERR "Sound warning: Deallocation table was too small.\n");
 579
 580         return 0;
 581 }
 582
 583 static void __exit oss_cleanup(void)
 584 {
 585         int i, j;
 586
 587         for (i = 0; i < ARRAY_SIZE(dev_list); i++) {
 588                 device_destroy(sound_class, MKDEV(SOUND_MAJOR, dev_list[i].minor));
 589                 if (!dev_list[i].num)
 590                         continue;
 591                 for (j = 1; j < *dev_list[i].num; j++)
 592                         device_destroy(sound_class, MKDEV(SOUND_MAJOR, dev_list[i].minor + (j*0x10)));
 593         }
 594
 595         unregister_sound_special(1);
 596         unregister_sound_special(8);
 597
 598         sound_stop_timer();
 599
 600         sequencer_unload();
 601
 602         for (i = 0; i < MAX_DMA_CHANNELS; i++)
 603                 if (dma_alloc_map[i] != DMA_MAP_UNAVAIL) {
 604                         printk(KERN_ERR "Sound: Hmm, DMA%d was left allocated - fixed\n", i);
 605                         sound_free_dma(i);
 606                 }
 607
 608         for (i = 0; i < sound_nblocks; i++)
 609                 vfree(sound_mem_blocks[i]);
 610
 611 }
 612
 613 module_init(oss_init);
 614 module_exit(oss_cleanup);
 615 MODULE_LICENSE("GPL");
 616 MODULE_DESCRIPTION("OSS Sound subsystem");
 617 MODULE_AUTHOR("Hannu Savolainen, et al.");
 618
 619
 620 int sound_alloc_dma(int chn, char *deviceID)
 621 {
 622         int err;
 623
 624         if ((err = request_dma(chn, deviceID)) != 0)
 625                 return err;
 626
 627         dma_alloc_map[chn] = DMA_MAP_FREE;
 628
 629         return 0;
 630 }
 631 EXPORT_SYMBOL(sound_alloc_dma);
 632
 633 int sound_open_dma(int chn, char *deviceID)
 634 {
 635         if (!valid_dma(chn)) {
 636                 printk(KERN_ERR "sound_open_dma: Invalid DMA channel %d\n", chn);
 637                 return 1;
 638         }
 639
 640         if (dma_alloc_map[chn] != DMA_MAP_FREE) {
 641                 printk("sound_open_dma: DMA channel %d busy or not allocated (%d)\n", chn, dma_alloc_map[chn]);
 642                 return 1;
 643         }
 644         dma_alloc_map[chn] = DMA_MAP_BUSY;
 645         return 0;
 646 }
 647 EXPORT_SYMBOL(sound_open_dma);
 648
 649 void sound_free_dma(int chn)
 650 {
 651         if (dma_alloc_map[chn] == DMA_MAP_UNAVAIL) {
 652                 /* printk( "sound_free_dma: Bad access to DMA channel %d\n",  chn); */
 653                 return;
 654         }
 655         free_dma(chn);
 656         dma_alloc_map[chn] = DMA_MAP_UNAVAIL;
 657 }
 658 EXPORT_SYMBOL(sound_free_dma);
 659
 660 void sound_close_dma(int chn)
 661 {
 662         if (dma_alloc_map[chn] != DMA_MAP_BUSY) {
 663                 printk(KERN_ERR "sound_close_dma: Bad access to DMA channel %d\n", chn);
 664                 return;
 665         }
 666         dma_alloc_map[chn] = DMA_MAP_FREE;
 667 }
 668 EXPORT_SYMBOL(sound_close_dma);
 669
 670 static void do_sequencer_timer(unsigned long dummy)
 671 {
 672         sequencer_timer(0);
 673 }
 674
 675
 676 static DEFINE_TIMER(seq_timer, do_sequencer_timer, 0, 0);
 677
 678 void request_sound_timer(int count)
 679 {
 680         extern unsigned long seq_time;
 681
 682         if (count < 0) {
 683                 seq_timer.expires = (-count) + jiffies;
 684                 add_timer(&seq_timer);
 685                 return;
 686         }
 687         count += seq_time;
 688
 689         count -= jiffies;
 690
 691         if (count < 1)
 692                 count = 1;
 693
 694         seq_timer.expires = (count) + jiffies;
 695         add_timer(&seq_timer);
 696 }
 697
 698 void sound_stop_timer(void)
 699 {
 700         del_timer(&seq_timer);
 701 }
 702
 703 void conf_printf(char *name, struct address_info *hw_config)
 704 {
 705 #ifndef CONFIG_SOUND_TRACEINIT
 706         return;
 707 #else
 708         printk("<%s> at 0x%03x", name, hw_config->io_base);
 709
 710         if (hw_config->irq)
 711                 printk(" irq %d", (hw_config->irq > 0) ? hw_config->irq : -hw_config->irq);
 712
 713         if (hw_config->dma != -1 || hw_config->dma2 != -1)
 714         {
 715                 printk(" dma %d", hw_config->dma);
 716                 if (hw_config->dma2 != -1)
 717                         printk(",%d", hw_config->dma2);
 718         }
 719         printk("\n");
 720 #endif
 721 }
 722 EXPORT_SYMBOL(conf_printf);
 723
 724 void conf_printf2(char *name, int base, int irq, int dma, int dma2)
 725 {
 726 #ifndef CONFIG_SOUND_TRACEINIT
 727         return;
 728 #else
 729         printk("<%s> at 0x%03x", name, base);
 730
 731         if (irq)
 732                 printk(" irq %d", (irq > 0) ? irq : -irq);
 733
 734         if (dma != -1 || dma2 != -1)
 735         {
 736                   printk(" dma %d", dma);
 737                   if (dma2 != -1)
 738                           printk(",%d", dma2);
 739         }
 740         printk("\n");
 741 #endif
 742 }
 743 EXPORT_SYMBOL(conf_printf2);
 744