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