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/mutex.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 static DEFINE_MUTEX(soundcard_mutex);
  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         mutex_lock(&soundcard_mutex);
 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         mutex_unlock(&soundcard_mutex);
 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         mutex_lock(&soundcard_mutex);
 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         mutex_unlock(&soundcard_mutex);
 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         mutex_lock(&soundcard_mutex);
 215         switch (dev & 0x0f) {
 216         case SND_DEV_CTL:
 217                 dev >>= 4;
 218                 if (dev >= 0 && dev < MAX_MIXER_DEV && mixer_devs[dev] == NULL) {
 219                         request_module("mixer%d", dev);
 220                 }
 221                 retval = -ENXIO;
 222                 if (dev && (dev >= num_mixers || mixer_devs[dev] == NULL))
 223                         break;
 224
 225                 if (!try_module_get(mixer_devs[dev]->owner))
 226                         break;
 227
 228                 retval = 0;
 229                 break;
 230
 231         case SND_DEV_SEQ:
 232         case SND_DEV_SEQ2:
 233                 retval = sequencer_open(dev, file);
 234                 break;
 235
 236         case SND_DEV_MIDIN:
 237                 retval = MIDIbuf_open(dev, file);
 238                 break;
 239
 240         case SND_DEV_DSP:
 241         case SND_DEV_DSP16:
 242         case SND_DEV_AUDIO:
 243                 retval = audio_open(dev, file);
 244                 break;
 245
 246         default:
 247                 printk(KERN_ERR "Invalid minor device %d\n", dev);
 248                 retval = -ENXIO;
 249         }
 250
 251         mutex_unlock(&soundcard_mutex);
 252         return retval;
 253 }
 254
 255 static int sound_release(struct inode *inode, struct file *file)
 256 {
 257         int dev = iminor(inode);
 258
 259         mutex_lock(&soundcard_mutex);
 260         DEB(printk("sound_release(dev=%d)\n", dev));
 261         switch (dev & 0x0f) {
 262         case SND_DEV_CTL:
 263                 module_put(mixer_devs[dev >> 4]->owner);
 264                 break;
 265
 266         case SND_DEV_SEQ:
 267         case SND_DEV_SEQ2:
 268                 sequencer_release(dev, file);
 269                 break;
 270
 271         case SND_DEV_MIDIN:
 272                 MIDIbuf_release(dev, file);
 273                 break;
 274
 275         case SND_DEV_DSP:
 276         case SND_DEV_DSP16:
 277         case SND_DEV_AUDIO:
 278                 audio_release(dev, file);
 279                 break;
 280
 281         default:
 282                 printk(KERN_ERR "Sound error: Releasing unknown device 0x%02x\n", dev);
 283         }
 284         mutex_unlock(&soundcard_mutex);
 285
 286         return 0;
 287 }
 288
 289 static int get_mixer_info(int dev, void __user *arg)
 290 {
 291         mixer_info info;
 292         memset(&info, 0, sizeof(info));
 293         strlcpy(info.id, mixer_devs[dev]->id, sizeof(info.id));
 294         strlcpy(info.name, mixer_devs[dev]->name, sizeof(info.name));
 295         info.modify_counter = mixer_devs[dev]->modify_counter;
 296         if (__copy_to_user(arg, &info,  sizeof(info)))
 297                 return -EFAULT;
 298         return 0;
 299 }
 300
 301 static int get_old_mixer_info(int dev, void __user *arg)
 302 {
 303         _old_mixer_info info;
 304         memset(&info, 0, sizeof(info));
 305         strlcpy(info.id, mixer_devs[dev]->id, sizeof(info.id));
 306         strlcpy(info.name, mixer_devs[dev]->name, sizeof(info.name));
 307         if (copy_to_user(arg, &info,  sizeof(info)))
 308                 return -EFAULT;
 309         return 0;
 310 }
 311
 312 static int sound_mixer_ioctl(int mixdev, unsigned int cmd, void __user *arg)
 313 {
 314         if (mixdev < 0 || mixdev >= MAX_MIXER_DEV)
 315                 return -ENXIO;
 316         /* Try to load the mixer... */
 317         if (mixer_devs[mixdev] == NULL) {
 318                 request_module("mixer%d", mixdev);
 319         }
 320         if (mixdev >= num_mixers || !mixer_devs[mixdev])
 321                 return -ENXIO;
 322         if (cmd == SOUND_MIXER_INFO)
 323                 return get_mixer_info(mixdev, arg);
 324         if (cmd == SOUND_OLD_MIXER_INFO)
 325                 return get_old_mixer_info(mixdev, arg);
 326         if (_SIOC_DIR(cmd) & _SIOC_WRITE)
 327                 mixer_devs[mixdev]->modify_counter++;
 328         if (!mixer_devs[mixdev]->ioctl)
 329                 return -EINVAL;
 330         return mixer_devs[mixdev]->ioctl(mixdev, cmd, arg);
 331 }
 332
 333 static long sound_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 334 {
 335         int len = 0, dtype;
 336         int dev = iminor(file->f_dentry->d_inode);
 337         long ret = -EINVAL;
 338         void __user *p = (void __user *)arg;
 339
 340         if (_SIOC_DIR(cmd) != _SIOC_NONE && _SIOC_DIR(cmd) != 0) {
 341                 /*
 342                  * Have to validate the address given by the process.
 343                  */
 344                 len = _SIOC_SIZE(cmd);
 345                 if (len < 1 || len > 65536 || !p)
 346                         return -EFAULT;
 347                 if (_SIOC_DIR(cmd) & _SIOC_WRITE)
 348                         if (!access_ok(VERIFY_READ, p, len))
 349                                 return -EFAULT;
 350                 if (_SIOC_DIR(cmd) & _SIOC_READ)
 351                         if (!access_ok(VERIFY_WRITE, p, len))
 352                                 return -EFAULT;
 353         }
 354         DEB(printk("sound_ioctl(dev=%d, cmd=0x%x, arg=0x%x)\n", dev, cmd, arg));
 355         if (cmd == OSS_GETVERSION)
 356                 return __put_user(SOUND_VERSION, (int __user *)p);
 357
 358         mutex_lock(&soundcard_mutex);
 359         if (_IOC_TYPE(cmd) == 'M' && num_mixers > 0 &&   /* Mixer ioctl */
 360             (dev & 0x0f) != SND_DEV_CTL) {
 361                 dtype = dev & 0x0f;
 362                 switch (dtype) {
 363                 case SND_DEV_DSP:
 364                 case SND_DEV_DSP16:
 365                 case SND_DEV_AUDIO:
 366                         ret = sound_mixer_ioctl(audio_devs[dev >> 4]->mixer_dev,
 367                                                  cmd, p);
 368                         break;
 369                 default:
 370                         ret = sound_mixer_ioctl(dev >> 4, cmd, p);
 371                         break;
 372                 }
 373                 mutex_unlock(&soundcard_mutex);
 374                 return ret;
 375         }
 376
 377         switch (dev & 0x0f) {
 378         case SND_DEV_CTL:
 379                 if (cmd == SOUND_MIXER_GETLEVELS)
 380                         ret = get_mixer_levels(p);
 381                 else if (cmd == SOUND_MIXER_SETLEVELS)
 382                         ret = set_mixer_levels(p);
 383                 else
 384                         ret = sound_mixer_ioctl(dev >> 4, cmd, p);
 385                 break;
 386
 387         case SND_DEV_SEQ:
 388         case SND_DEV_SEQ2:
 389                 ret = sequencer_ioctl(dev, file, cmd, p);
 390                 break;
 391
 392         case SND_DEV_DSP:
 393         case SND_DEV_DSP16:
 394         case SND_DEV_AUDIO:
 395                 ret = audio_ioctl(dev, file, cmd, p);
 396                 break;
 397
 398         case SND_DEV_MIDIN:
 399                 ret = MIDIbuf_ioctl(dev, file, cmd, p);
 400                 break;
 401
 402         }
 403         mutex_unlock(&soundcard_mutex);
 404         return ret;
 405 }
 406
 407 static unsigned int sound_poll(struct file *file, poll_table * wait)
 408 {
 409         struct inode *inode = file->f_path.dentry->d_inode;
 410         int dev = iminor(inode);
 411
 412         DEB(printk("sound_poll(dev=%d)\n", dev));
 413         switch (dev & 0x0f) {
 414         case SND_DEV_SEQ:
 415         case SND_DEV_SEQ2:
 416                 return sequencer_poll(dev, file, wait);
 417
 418         case SND_DEV_MIDIN:
 419                 return MIDIbuf_poll(dev, file, wait);
 420
 421         case SND_DEV_DSP:
 422         case SND_DEV_DSP16:
 423         case SND_DEV_AUDIO:
 424                 return DMAbuf_poll(file, dev >> 4, wait);
 425         }
 426         return 0;
 427 }
 428
 429 static int sound_mmap(struct file *file, struct vm_area_struct *vma)
 430 {
 431         int dev_class;
 432         unsigned long size;
 433         struct dma_buffparms *dmap = NULL;
 434         int dev = iminor(file->f_path.dentry->d_inode);
 435
 436         dev_class = dev & 0x0f;
 437         dev >>= 4;
 438
 439         if (dev_class != SND_DEV_DSP && dev_class != SND_DEV_DSP16 && dev_class != SND_DEV_AUDIO) {
 440                 printk(KERN_ERR "Sound: mmap() not supported for other than audio devices\n");
 441                 return -EINVAL;
 442         }
 443         mutex_lock(&soundcard_mutex);
 444         if (vma->vm_flags & VM_WRITE)   /* Map write and read/write to the output buf */
 445                 dmap = audio_devs[dev]->dmap_out;
 446         else if (vma->vm_flags & VM_READ)
 447                 dmap = audio_devs[dev]->dmap_in;
 448         else {
 449                 printk(KERN_ERR "Sound: Undefined mmap() access\n");
 450                 mutex_unlock(&soundcard_mutex);
 451                 return -EINVAL;
 452         }
 453
 454         if (dmap == NULL) {
 455                 printk(KERN_ERR "Sound: mmap() error. dmap == NULL\n");
 456                 mutex_unlock(&soundcard_mutex);
 457                 return -EIO;
 458         }
 459         if (dmap->raw_buf == NULL) {
 460                 printk(KERN_ERR "Sound: mmap() called when raw_buf == NULL\n");
 461                 mutex_unlock(&soundcard_mutex);
 462                 return -EIO;
 463         }
 464         if (dmap->mapping_flags) {
 465                 printk(KERN_ERR "Sound: mmap() called twice for the same DMA buffer\n");
 466                 mutex_unlock(&soundcard_mutex);
 467                 return -EIO;
 468         }
 469         if (vma->vm_pgoff != 0) {
 470                 printk(KERN_ERR "Sound: mmap() offset must be 0.\n");
 471                 mutex_unlock(&soundcard_mutex);
 472                 return -EINVAL;
 473         }
 474         size = vma->vm_end - vma->vm_start;
 475
 476         if (size != dmap->bytes_in_use) {
 477                 printk(KERN_WARNING "Sound: mmap() size = %ld. Should be %d\n", size, dmap->bytes_in_use);
 478         }
 479         if (remap_pfn_range(vma, vma->vm_start,
 480                         virt_to_phys(dmap->raw_buf) >> PAGE_SHIFT,
 481                         vma->vm_end - vma->vm_start, vma->vm_page_prot)) {
 482                 mutex_unlock(&soundcard_mutex);
 483                 return -EAGAIN;
 484         }
 485
 486         dmap->mapping_flags |= DMA_MAP_MAPPED;
 487
 488         if( audio_devs[dev]->d->mmap)
 489                 audio_devs[dev]->d->mmap(dev);
 490
 491         memset(dmap->raw_buf,
 492                dmap->neutral_byte,
 493                dmap->bytes_in_use);
 494         mutex_unlock(&soundcard_mutex);
 495         return 0;
 496 }
 497
 498 const struct file_operations oss_sound_fops = {
 499         .owner          = THIS_MODULE,
 500         .llseek         = no_llseek,
 501         .read           = sound_read,
 502         .write          = sound_write,
 503         .poll           = sound_poll,
 504         .unlocked_ioctl = sound_ioctl,
 505         .mmap           = sound_mmap,
 506         .open           = sound_open,
 507         .release        = sound_release,
 508 };
 509
 510 /*
 511  *      Create the required special subdevices
 512  */
 513
 514 static int create_special_devices(void)
 515 {
 516         int seq1,seq2;
 517         seq1=register_sound_special(&oss_sound_fops, 1);
 518         if(seq1==-1)
 519                 goto bad;
 520         seq2=register_sound_special(&oss_sound_fops, 8);
 521         if(seq2!=-1)
 522                 return 0;
 523         unregister_sound_special(1);
 524 bad:
 525         return -1;
 526 }
 527
 528
 529 /* These device names follow the official Linux device list,
 530  * Documentation/devices.txt.  Let us know if there are other
 531  * common names we should support for compatibility.
 532  * Only those devices not created by the generic code in sound_core.c are
 533  * registered here.
 534  */
 535 static const struct {
 536         unsigned short minor;
 537         char *name;
 538         umode_t mode;
 539         int *num;
 540 } dev_list[] = { /* list of minor devices */
 541 /* seems to be some confusion here -- this device is not in the device list */
 542         {SND_DEV_DSP16,     "dspW",      S_IWUGO | S_IRUSR | S_IRGRP,
 543          &num_audiodevs},
 544         {SND_DEV_AUDIO,     "audio",     S_IWUGO | S_IRUSR | S_IRGRP,
 545          &num_audiodevs},
 546 };
 547
 548 static int dmabuf;
 549 static int dmabug;
 550
 551 module_param(dmabuf, int, 0444);
 552 module_param(dmabug, int, 0444);
 553
 554 static int __init oss_init(void)
 555 {
 556         int             err;
 557         int i, j;
 558
 559 #ifdef CONFIG_PCI
 560         if(dmabug)
 561                 isa_dma_bridge_buggy = dmabug;
 562 #endif
 563
 564         err = create_special_devices();
 565         if (err) {
 566                 printk(KERN_ERR "sound: driver already loaded/included in kernel\n");
 567                 return err;
 568         }
 569
 570         /* Protecting the innocent */
 571         sound_dmap_flag = (dmabuf > 0 ? 1 : 0);
 572
 573         for (i = 0; i < ARRAY_SIZE(dev_list); i++) {
 574                 device_create(sound_class, NULL,
 575                               MKDEV(SOUND_MAJOR, dev_list[i].minor), NULL,
 576                               "%s", dev_list[i].name);
 577
 578                 if (!dev_list[i].num)
 579                         continue;
 580
 581                 for (j = 1; j < *dev_list[i].num; j++)
 582                         device_create(sound_class, NULL,
 583                                       MKDEV(SOUND_MAJOR,
 584                                             dev_list[i].minor + (j*0x10)),
 585                                       NULL, "%s%d", dev_list[i].name, j);
 586         }
 587
 588         if (sound_nblocks >= MAX_MEM_BLOCKS - 1)
 589                 printk(KERN_ERR "Sound warning: Deallocation table was too small.\n");
 590
 591         return 0;
 592 }
 593
 594 static void __exit oss_cleanup(void)
 595 {
 596         int i, j;
 597
 598         for (i = 0; i < ARRAY_SIZE(dev_list); i++) {
 599                 device_destroy(sound_class, MKDEV(SOUND_MAJOR, dev_list[i].minor));
 600                 if (!dev_list[i].num)
 601                         continue;
 602                 for (j = 1; j < *dev_list[i].num; j++)
 603                         device_destroy(sound_class, MKDEV(SOUND_MAJOR, dev_list[i].minor + (j*0x10)));
 604         }
 605
 606         unregister_sound_special(1);
 607         unregister_sound_special(8);
 608
 609         sound_stop_timer();
 610
 611         sequencer_unload();
 612
 613         for (i = 0; i < MAX_DMA_CHANNELS; i++)
 614                 if (dma_alloc_map[i] != DMA_MAP_UNAVAIL) {
 615                         printk(KERN_ERR "Sound: Hmm, DMA%d was left allocated - fixed\n", i);
 616                         sound_free_dma(i);
 617                 }
 618
 619         for (i = 0; i < sound_nblocks; i++)
 620                 vfree(sound_mem_blocks[i]);
 621
 622 }
 623
 624 module_init(oss_init);
 625 module_exit(oss_cleanup);
 626 MODULE_LICENSE("GPL");
 627 MODULE_DESCRIPTION("OSS Sound subsystem");
 628 MODULE_AUTHOR("Hannu Savolainen, et al.");
 629
 630
 631 int sound_alloc_dma(int chn, char *deviceID)
 632 {
 633         int err;
 634
 635         if ((err = request_dma(chn, deviceID)) != 0)
 636                 return err;
 637
 638         dma_alloc_map[chn] = DMA_MAP_FREE;
 639
 640         return 0;
 641 }
 642 EXPORT_SYMBOL(sound_alloc_dma);
 643
 644 int sound_open_dma(int chn, char *deviceID)
 645 {
 646         if (!valid_dma(chn)) {
 647                 printk(KERN_ERR "sound_open_dma: Invalid DMA channel %d\n", chn);
 648                 return 1;
 649         }
 650
 651         if (dma_alloc_map[chn] != DMA_MAP_FREE) {
 652                 printk("sound_open_dma: DMA channel %d busy or not allocated (%d)\n", chn, dma_alloc_map[chn]);
 653                 return 1;
 654         }
 655         dma_alloc_map[chn] = DMA_MAP_BUSY;
 656         return 0;
 657 }
 658 EXPORT_SYMBOL(sound_open_dma);
 659
 660 void sound_free_dma(int chn)
 661 {
 662         if (dma_alloc_map[chn] == DMA_MAP_UNAVAIL) {
 663                 /* printk( "sound_free_dma: Bad access to DMA channel %d\n",  chn); */
 664                 return;
 665         }
 666         free_dma(chn);
 667         dma_alloc_map[chn] = DMA_MAP_UNAVAIL;
 668 }
 669 EXPORT_SYMBOL(sound_free_dma);
 670
 671 void sound_close_dma(int chn)
 672 {
 673         if (dma_alloc_map[chn] != DMA_MAP_BUSY) {
 674                 printk(KERN_ERR "sound_close_dma: Bad access to DMA channel %d\n", chn);
 675                 return;
 676         }
 677         dma_alloc_map[chn] = DMA_MAP_FREE;
 678 }
 679 EXPORT_SYMBOL(sound_close_dma);
 680
 681 static void do_sequencer_timer(unsigned long dummy)
 682 {
 683         sequencer_timer(0);
 684 }
 685
 686
 687 static DEFINE_TIMER(seq_timer, do_sequencer_timer, 0, 0);
 688
 689 void request_sound_timer(int count)
 690 {
 691         extern unsigned long seq_time;
 692
 693         if (count < 0) {
 694                 seq_timer.expires = (-count) + jiffies;
 695                 add_timer(&seq_timer);
 696                 return;
 697         }
 698         count += seq_time;
 699
 700         count -= jiffies;
 701
 702         if (count < 1)
 703                 count = 1;
 704
 705         seq_timer.expires = (count) + jiffies;
 706         add_timer(&seq_timer);
 707 }
 708
 709 void sound_stop_timer(void)
 710 {
 711         del_timer(&seq_timer);
 712 }
 713
 714 void conf_printf(char *name, struct address_info *hw_config)
 715 {
 716 #ifndef CONFIG_SOUND_TRACEINIT
 717         return;
 718 #else
 719         printk("<%s> at 0x%03x", name, hw_config->io_base);
 720
 721         if (hw_config->irq)
 722                 printk(" irq %d", (hw_config->irq > 0) ? hw_config->irq : -hw_config->irq);
 723
 724         if (hw_config->dma != -1 || hw_config->dma2 != -1)
 725         {
 726                 printk(" dma %d", hw_config->dma);
 727                 if (hw_config->dma2 != -1)
 728                         printk(",%d", hw_config->dma2);
 729         }
 730         printk("\n");
 731 #endif
 732 }
 733 EXPORT_SYMBOL(conf_printf);
 734
 735 void conf_printf2(char *name, int base, int irq, int dma, int dma2)
 736 {
 737 #ifndef CONFIG_SOUND_TRACEINIT
 738         return;
 739 #else
 740         printk("<%s> at 0x%03x", name, base);
 741
 742         if (irq)
 743                 printk(" irq %d", (irq > 0) ? irq : -irq);
 744
 745         if (dma != -1 || dma2 != -1)
 746         {
 747                   printk(" dma %d", dma);
 748                   if (dma2 != -1)
 749                           printk(",%d", dma2);
 750         }
 751         printk("\n");
 752 #endif
 753 }
 754 EXPORT_SYMBOL(conf_printf2);
 755