sound/oss/soundcard.c

   1 /*
   2  * linux/drivers/sound/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 #include <linux/config.h>
  26
  27 #include "sound_config.h"
  28 #include <linux/init.h>
  29 #include <linux/types.h>
  30 #include <linux/errno.h>
  31 #include <linux/signal.h>
  32 #include <linux/fcntl.h>
  33 #include <linux/ctype.h>
  34 #include <linux/stddef.h>
  35 #include <linux/kmod.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/devfs_fs_kernel.h>
  42 #include <linux/major.h>
  43 #include <linux/delay.h>
  44 #include <linux/proc_fs.h>
  45 #include <linux/smp_lock.h>
  46 #include <linux/module.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 caddr_t         sound_mem_blocks[1024];
  59 int             sound_nblocks = 0;
  60
  61 /* Persistent DMA buffers */
  62 #ifdef CONFIG_SOUND_DMAP
  63 int             sound_dmap_flag = 1;
  64 #else
  65 int             sound_dmap_flag = 0;
  66 #endif
  67
  68 static char     dma_alloc_map[MAX_DMA_CHANNELS] = {0};
  69
  70 #define DMA_MAP_UNAVAIL         0
  71 #define DMA_MAP_FREE            1
  72 #define DMA_MAP_BUSY            2
  73
  74
  75 unsigned long seq_time = 0;     /* Time for /dev/sequencer */
  76
  77 /*
  78  * Table for configurable mixer volume handling
  79  */
  80 static mixer_vol_table mixer_vols[MAX_MIXER_DEV];
  81 static int num_mixer_volumes = 0;
  82
  83 int *load_mixer_volumes(char *name, int *levels, int present)
  84 {
  85         int             i, n;
  86
  87         for (i = 0; i < num_mixer_volumes; i++) {
  88                 if (strcmp(name, mixer_vols[i].name) == 0) {
  89                         if (present)
  90                                 mixer_vols[i].num = i;
  91                         return mixer_vols[i].levels;
  92                 }
  93         }
  94         if (num_mixer_volumes >= MAX_MIXER_DEV) {
  95                 printk(KERN_ERR "Sound: Too many mixers (%s)\n", name);
  96                 return levels;
  97         }
  98         n = num_mixer_volumes++;
  99
 100         strcpy(mixer_vols[n].name, name);
 101
 102         if (present)
 103                 mixer_vols[n].num = n;
 104         else
 105                 mixer_vols[n].num = -1;
 106
 107         for (i = 0; i < 32; i++)
 108                 mixer_vols[n].levels[i] = levels[i];
 109         return mixer_vols[n].levels;
 110 }
 111
 112 static int set_mixer_levels(caddr_t 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(caddr_t arg)
 126 {
 127         int n;
 128
 129         if (__get_user(n, (int *)(&(((mixer_vol_table *)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 #ifndef MIN
 139 #define MIN(a,b) (((a) < (b)) ? (a) : (b))
 140 #endif
 141
 142 /* 4K page size but our output routines use some slack for overruns */
 143 #define PROC_BLOCK_SIZE (3*1024)
 144
 145 static ssize_t sound_read(struct file *file, char *buf, size_t count, loff_t *ppos)
 146 {
 147         int dev = minor(file->f_dentry->d_inode->i_rdev);
 148         int ret = -EINVAL;
 149
 150         /*
 151          *      The OSS drivers aren't remotely happy without this locking,
 152          *      and unless someone fixes them when they are about to bite the
 153          *      big one anyway, we might as well bandage here..
 154          */
 155
 156         lock_kernel();
 157
 158         DEB(printk("sound_read(dev=%d, count=%d)\n", dev, count));
 159         switch (dev & 0x0f) {
 160         case SND_DEV_DSP:
 161         case SND_DEV_DSP16:
 162         case SND_DEV_AUDIO:
 163                 ret = audio_read(dev, file, buf, count);
 164                 break;
 165
 166         case SND_DEV_SEQ:
 167         case SND_DEV_SEQ2:
 168                 ret = sequencer_read(dev, file, buf, count);
 169                 break;
 170
 171         case SND_DEV_MIDIN:
 172                 ret = MIDIbuf_read(dev, file, buf, count);
 173         }
 174         unlock_kernel();
 175         return ret;
 176 }
 177
 178 static ssize_t sound_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
 179 {
 180         int dev = minor(file->f_dentry->d_inode->i_rdev);
 181         int ret = -EINVAL;
 182
 183         lock_kernel();
 184         DEB(printk("sound_write(dev=%d, count=%d)\n", dev, count));
 185         switch (dev & 0x0f) {
 186         case SND_DEV_SEQ:
 187         case SND_DEV_SEQ2:
 188                 ret =  sequencer_write(dev, file, buf, count);
 189                 break;
 190
 191         case SND_DEV_DSP:
 192         case SND_DEV_DSP16:
 193         case SND_DEV_AUDIO:
 194                 ret = audio_write(dev, file, buf, count);
 195                 break;
 196
 197         case SND_DEV_MIDIN:
 198                 ret =  MIDIbuf_write(dev, file, buf, count);
 199                 break;
 200         }
 201         unlock_kernel();
 202         return ret;
 203 }
 204
 205 static int sound_open(struct inode *inode, struct file *file)
 206 {
 207         int dev = minor(inode->i_rdev);
 208         int retval;
 209
 210         DEB(printk("sound_open(dev=%d)\n", dev));
 211         if ((dev >= SND_NDEVS) || (dev < 0)) {
 212                 printk(KERN_ERR "Invalid minor device %d\n", dev);
 213                 return -ENXIO;
 214         }
 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                         char modname[20];
 220                         sprintf(modname, "mixer%d", dev);
 221                         request_module(modname);
 222                 }
 223                 if (dev && (dev >= num_mixers || mixer_devs[dev] == NULL))
 224                         return -ENXIO;
 225
 226                 if (mixer_devs[dev]->owner)
 227                         __MOD_INC_USE_COUNT (mixer_devs[dev]->owner);
 228                 break;
 229
 230         case SND_DEV_SEQ:
 231         case SND_DEV_SEQ2:
 232                 if ((retval = sequencer_open(dev, file)) < 0)
 233                         return retval;
 234                 break;
 235
 236         case SND_DEV_MIDIN:
 237                 if ((retval = MIDIbuf_open(dev, file)) < 0)
 238                         return retval;
 239                 break;
 240
 241         case SND_DEV_DSP:
 242         case SND_DEV_DSP16:
 243         case SND_DEV_AUDIO:
 244                 if ((retval = audio_open(dev, file)) < 0)
 245                         return retval;
 246                 break;
 247
 248         default:
 249                 printk(KERN_ERR "Invalid minor device %d\n", dev);
 250                 return -ENXIO;
 251         }
 252
 253         return 0;
 254 }
 255
 256 static int sound_release(struct inode *inode, struct file *file)
 257 {
 258         int dev = minor(inode->i_rdev);
 259
 260         lock_kernel();
 261         DEB(printk("sound_release(dev=%d)\n", dev));
 262         switch (dev & 0x0f) {
 263         case SND_DEV_CTL:
 264                 dev >>= 4;
 265                 if (mixer_devs[dev]->owner)
 266                         __MOD_DEC_USE_COUNT (mixer_devs[dev]->owner);
 267                 break;
 268
 269         case SND_DEV_SEQ:
 270         case SND_DEV_SEQ2:
 271                 sequencer_release(dev, file);
 272                 break;
 273
 274         case SND_DEV_MIDIN:
 275                 MIDIbuf_release(dev, file);
 276                 break;
 277
 278         case SND_DEV_DSP:
 279         case SND_DEV_DSP16:
 280         case SND_DEV_AUDIO:
 281                 audio_release(dev, file);
 282                 break;
 283
 284         default:
 285                 printk(KERN_ERR "Sound error: Releasing unknown device 0x%02x\n", dev);
 286         }
 287         unlock_kernel();
 288
 289         return 0;
 290 }
 291
 292 static int get_mixer_info(int dev, caddr_t arg)
 293 {
 294         mixer_info info;
 295
 296         strncpy(info.id, mixer_devs[dev]->id, sizeof(info.id));
 297         strncpy(info.name, mixer_devs[dev]->name, sizeof(info.name));
 298         info.name[sizeof(info.name)-1] = 0;
 299         info.modify_counter = mixer_devs[dev]->modify_counter;
 300         if (__copy_to_user(arg, &info,  sizeof(info)))
 301                 return -EFAULT;
 302         return 0;
 303 }
 304
 305 static int get_old_mixer_info(int dev, caddr_t arg)
 306 {
 307         _old_mixer_info info;
 308
 309         strncpy(info.id, mixer_devs[dev]->id, sizeof(info.id));
 310         strncpy(info.name, mixer_devs[dev]->name, sizeof(info.name));
 311         info.name[sizeof(info.name)-1] = 0;
 312         if (copy_to_user(arg, &info,  sizeof(info)))
 313                 return -EFAULT;
 314         return 0;
 315 }
 316
 317 static int sound_mixer_ioctl(int mixdev, unsigned int cmd, caddr_t arg)
 318 {
 319         if (mixdev < 0 || mixdev >= MAX_MIXER_DEV)
 320                 return -ENXIO;
 321         /* Try to load the mixer... */
 322         if (mixer_devs[mixdev] == NULL) {
 323                 char modname[20];
 324                 sprintf(modname, "mixer%d", mixdev);
 325                 request_module(modname);
 326         }
 327         if (mixdev >= num_mixers || !mixer_devs[mixdev])
 328                 return -ENXIO;
 329         if (cmd == SOUND_MIXER_INFO)
 330                 return get_mixer_info(mixdev, arg);
 331         if (cmd == SOUND_OLD_MIXER_INFO)
 332                 return get_old_mixer_info(mixdev, arg);
 333         if (_SIOC_DIR(cmd) & _SIOC_WRITE)
 334                 mixer_devs[mixdev]->modify_counter++;
 335         if (!mixer_devs[mixdev]->ioctl)
 336                 return -EINVAL;
 337         return mixer_devs[mixdev]->ioctl(mixdev, cmd, arg);
 338 }
 339
 340 static int sound_ioctl(struct inode *inode, struct file *file,
 341                        unsigned int cmd, unsigned long arg)
 342 {
 343         int err, len = 0, dtype;
 344         int dev = minor(inode->i_rdev);
 345
 346         if (_SIOC_DIR(cmd) != _SIOC_NONE && _SIOC_DIR(cmd) != 0) {
 347                 /*
 348                  * Have to validate the address given by the process.
 349                  */
 350                 len = _SIOC_SIZE(cmd);
 351                 if (len < 1 || len > 65536 || arg == 0)
 352                         return -EFAULT;
 353                 if (_SIOC_DIR(cmd) & _SIOC_WRITE)
 354                         if ((err = verify_area(VERIFY_READ, (void *)arg, len)) < 0)
 355                                 return err;
 356                 if (_SIOC_DIR(cmd) & _SIOC_READ)
 357                         if ((err = verify_area(VERIFY_WRITE, (void *)arg, len)) < 0)
 358                                 return err;
 359         }
 360         DEB(printk("sound_ioctl(dev=%d, cmd=0x%x, arg=0x%x)\n", dev, cmd, arg));
 361         if (cmd == OSS_GETVERSION)
 362                 return __put_user(SOUND_VERSION, (int *)arg);
 363
 364         if (_IOC_TYPE(cmd) == 'M' && num_mixers > 0 &&   /* Mixer ioctl */
 365             (dev & 0x0f) != SND_DEV_CTL) {
 366                 dtype = dev & 0x0f;
 367                 switch (dtype) {
 368                 case SND_DEV_DSP:
 369                 case SND_DEV_DSP16:
 370                 case SND_DEV_AUDIO:
 371                         return sound_mixer_ioctl(audio_devs[dev >> 4]->mixer_dev,
 372                                                  cmd, (caddr_t)arg);
 373
 374                 default:
 375                         return sound_mixer_ioctl(dev >> 4, cmd, (caddr_t)arg);
 376                 }
 377         }
 378         switch (dev & 0x0f) {
 379         case SND_DEV_CTL:
 380                 if (cmd == SOUND_MIXER_GETLEVELS)
 381                         return get_mixer_levels((caddr_t)arg);
 382                 if (cmd == SOUND_MIXER_SETLEVELS)
 383                         return set_mixer_levels((caddr_t)arg);
 384                 return sound_mixer_ioctl(dev >> 4, cmd, (caddr_t)arg);
 385
 386         case SND_DEV_SEQ:
 387         case SND_DEV_SEQ2:
 388                 return sequencer_ioctl(dev, file, cmd, (caddr_t)arg);
 389
 390         case SND_DEV_DSP:
 391         case SND_DEV_DSP16:
 392         case SND_DEV_AUDIO:
 393                 return audio_ioctl(dev, file, cmd, (caddr_t)arg);
 394                 break;
 395
 396         case SND_DEV_MIDIN:
 397                 return MIDIbuf_ioctl(dev, file, cmd, (caddr_t)arg);
 398                 break;
 399
 400         }
 401         return -EINVAL;
 402 }
 403
 404 static unsigned int sound_poll(struct file *file, poll_table * wait)
 405 {
 406         struct inode *inode = file->f_dentry->d_inode;
 407         int dev = minor(inode->i_rdev);
 408
 409         DEB(printk("sound_poll(dev=%d)\n", dev));
 410         switch (dev & 0x0f) {
 411         case SND_DEV_SEQ:
 412         case SND_DEV_SEQ2:
 413                 return sequencer_poll(dev, file, wait);
 414
 415         case SND_DEV_MIDIN:
 416                 return MIDIbuf_poll(dev, file, wait);
 417
 418         case SND_DEV_DSP:
 419         case SND_DEV_DSP16:
 420         case SND_DEV_AUDIO:
 421                 return DMAbuf_poll(file, dev >> 4, wait);
 422         }
 423         return 0;
 424 }
 425
 426 static int sound_mmap(struct file *file, struct vm_area_struct *vma)
 427 {
 428         int dev_class;
 429         unsigned long size;
 430         struct dma_buffparms *dmap = NULL;
 431         int dev = minor(file->f_dentry->d_inode->i_rdev);
 432
 433         dev_class = dev & 0x0f;
 434         dev >>= 4;
 435
 436         if (dev_class != SND_DEV_DSP && dev_class != SND_DEV_DSP16 && dev_class != SND_DEV_AUDIO) {
 437                 printk(KERN_ERR "Sound: mmap() not supported for other than audio devices\n");
 438                 return -EINVAL;
 439         }
 440         lock_kernel();
 441         if (vma->vm_flags & VM_WRITE)   /* Map write and read/write to the output buf */
 442                 dmap = audio_devs[dev]->dmap_out;
 443         else if (vma->vm_flags & VM_READ)
 444                 dmap = audio_devs[dev]->dmap_in;
 445         else {
 446                 printk(KERN_ERR "Sound: Undefined mmap() access\n");
 447                 unlock_kernel();
 448                 return -EINVAL;
 449         }
 450
 451         if (dmap == NULL) {
 452                 printk(KERN_ERR "Sound: mmap() error. dmap == NULL\n");
 453                 unlock_kernel();
 454                 return -EIO;
 455         }
 456         if (dmap->raw_buf == NULL) {
 457                 printk(KERN_ERR "Sound: mmap() called when raw_buf == NULL\n");
 458                 unlock_kernel();
 459                 return -EIO;
 460         }
 461         if (dmap->mapping_flags) {
 462                 printk(KERN_ERR "Sound: mmap() called twice for the same DMA buffer\n");
 463                 unlock_kernel();
 464                 return -EIO;
 465         }
 466         if (vma->vm_pgoff != 0) {
 467                 printk(KERN_ERR "Sound: mmap() offset must be 0.\n");
 468                 unlock_kernel();
 469                 return -EINVAL;
 470         }
 471         size = vma->vm_end - vma->vm_start;
 472
 473         if (size != dmap->bytes_in_use) {
 474                 printk(KERN_WARNING "Sound: mmap() size = %ld. Should be %d\n", size, dmap->bytes_in_use);
 475         }
 476         if (remap_page_range(vma, vma->vm_start, virt_to_phys(dmap->raw_buf),
 477                 vma->vm_end - vma->vm_start,
 478                 vma->vm_page_prot)) {
 479                 unlock_kernel();
 480                 return -EAGAIN;
 481         }
 482
 483         dmap->mapping_flags |= DMA_MAP_MAPPED;
 484
 485         if( audio_devs[dev]->d->mmap)
 486                 audio_devs[dev]->d->mmap(dev);
 487
 488         memset(dmap->raw_buf,
 489                dmap->neutral_byte,
 490                dmap->bytes_in_use);
 491         unlock_kernel();
 492         return 0;
 493 }
 494
 495 struct file_operations oss_sound_fops = {
 496         owner:          THIS_MODULE,
 497         llseek:         no_llseek,
 498         read:           sound_read,
 499         write:          sound_write,
 500         poll:           sound_poll,
 501         ioctl:          sound_ioctl,
 502         mmap:           sound_mmap,
 503         open:           sound_open,
 504         release:        sound_release,
 505 };
 506
 507 /*
 508  *      Create the required special subdevices
 509  */
 510
 511 static int create_special_devices(void)
 512 {
 513         int seq1,seq2;
 514         seq1=register_sound_special(&oss_sound_fops, 1);
 515         if(seq1==-1)
 516                 goto bad;
 517         seq2=register_sound_special(&oss_sound_fops, 8);
 518         if(seq2!=-1)
 519                 return 0;
 520         unregister_sound_special(1);
 521 bad:
 522         return -1;
 523 }
 524
 525
 526 /* These device names follow the official Linux device list,
 527  * Documentation/devices.txt.  Let us know if there are other
 528  * common names we should support for compatibility.
 529  * Only those devices not created by the generic code in sound_core.c are
 530  * registered here.
 531  */
 532 static const struct {
 533         unsigned short minor;
 534         char *name;
 535         umode_t mode;
 536         int *num;
 537 } dev_list[] = { /* list of minor devices */
 538 /* seems to be some confusion here -- this device is not in the device list */
 539         {SND_DEV_DSP16,     "dspW",      S_IWUGO | S_IRUSR | S_IRGRP,
 540          &num_audiodevs},
 541         {SND_DEV_AUDIO,     "audio",     S_IWUGO | S_IRUSR | S_IRGRP,
 542          &num_audiodevs},
 543 };
 544
 545 static int dmabuf = 0;
 546 static int dmabug = 0;
 547
 548 MODULE_PARM(dmabuf, "i");
 549 MODULE_PARM(dmabug, "i");
 550
 551 static int __init oss_init(void)
 552 {
 553         int             err;
 554         char name_buf[32];
 555         int i, j;
 556
 557         /* drag in sound_syms.o */
 558         {
 559                 extern char sound_syms_symbol;
 560                 sound_syms_symbol = 0;
 561         }
 562
 563 #ifdef CONFIG_PCI
 564         if(dmabug)
 565                 isa_dma_bridge_buggy = dmabug;
 566 #endif
 567
 568         err = create_special_devices();
 569         if (err) {
 570                 printk(KERN_ERR "sound: driver already loaded/included in kernel\n");
 571                 return err;
 572         }
 573
 574         /* Protecting the innocent */
 575         sound_dmap_flag = (dmabuf > 0 ? 1 : 0);
 576
 577         for (i = 0; i < sizeof (dev_list) / sizeof *dev_list; i++) {
 578                 sprintf(name_buf, "sound/%s", dev_list[i].name);
 579                 devfs_register (NULL, name_buf, DEVFS_FL_NONE,
 580                         SOUND_MAJOR, dev_list[i].minor,
 581                         S_IFCHR | dev_list[i].mode,
 582                         &oss_sound_fops, NULL);
 583                 if (!dev_list[i].num)
 584                         continue;
 585                 for (j = 1; j < *dev_list[i].num; j++) {
 586                         sprintf(name_buf, "sound/%s%d", dev_list[i].name, j);
 587                         devfs_register (NULL, name_buf, DEVFS_FL_NONE,
 588                                 SOUND_MAJOR, dev_list[i].minor + (j * 0x10),
 589                                 S_IFCHR | dev_list[i].mode,
 590                                 &oss_sound_fops, NULL);
 591                 }
 592         }
 593
 594         if (sound_nblocks >= 1024)
 595                 printk(KERN_ERR "Sound warning: Deallocation table was too small.\n");
 596
 597         return 0;
 598 }
 599
 600 static void __exit oss_cleanup(void)
 601 {
 602         int i, j;
 603
 604         if (MOD_IN_USE)
 605                 return;
 606
 607         for (i = 0; i < sizeof (dev_list) / sizeof *dev_list; i++) {
 608                 devfs_remove("snd/%s", dev_list[i].name);
 609                 if (!dev_list[i].num)
 610                         continue;
 611                 for (j = 1; j < *dev_list[i].num; j++)
 612                         devfs_remove("sound/%s%d", dev_list[i].name, j);
 613         }
 614
 615         unregister_sound_special(1);
 616         unregister_sound_special(8);
 617
 618         sound_stop_timer();
 619
 620         sequencer_unload();
 621
 622         for (i = 0; i < MAX_DMA_CHANNELS; i++)
 623                 if (dma_alloc_map[i] != DMA_MAP_UNAVAIL) {
 624                         printk(KERN_ERR "Sound: Hmm, DMA%d was left allocated - fixed\n", i);
 625                         sound_free_dma(i);
 626                 }
 627
 628         for (i = 0; i < sound_nblocks; i++)
 629                 vfree(sound_mem_blocks[i]);
 630
 631 }
 632
 633 module_init(oss_init);
 634 module_exit(oss_cleanup);
 635 MODULE_LICENSE("GPL");
 636
 637
 638 int sound_alloc_dma(int chn, char *deviceID)
 639 {
 640         int err;
 641
 642         if ((err = request_dma(chn, deviceID)) != 0)
 643                 return err;
 644
 645         dma_alloc_map[chn] = DMA_MAP_FREE;
 646
 647         return 0;
 648 }
 649
 650 int sound_open_dma(int chn, char *deviceID)
 651 {
 652         if (!valid_dma(chn)) {
 653                 printk(KERN_ERR "sound_open_dma: Invalid DMA channel %d\n", chn);
 654                 return 1;
 655         }
 656
 657         if (dma_alloc_map[chn] != DMA_MAP_FREE) {
 658                 printk("sound_open_dma: DMA channel %d busy or not allocated (%d)\n", chn, dma_alloc_map[chn]);
 659                 return 1;
 660         }
 661         dma_alloc_map[chn] = DMA_MAP_BUSY;
 662         return 0;
 663 }
 664
 665 void sound_free_dma(int chn)
 666 {
 667         if (dma_alloc_map[chn] == DMA_MAP_UNAVAIL) {
 668                 /* printk( "sound_free_dma: Bad access to DMA channel %d\n",  chn); */
 669                 return;
 670         }
 671         free_dma(chn);
 672         dma_alloc_map[chn] = DMA_MAP_UNAVAIL;
 673 }
 674
 675 void sound_close_dma(int chn)
 676 {
 677         if (dma_alloc_map[chn] != DMA_MAP_BUSY) {
 678                 printk(KERN_ERR "sound_close_dma: Bad access to DMA channel %d\n", chn);
 679                 return;
 680         }
 681         dma_alloc_map[chn] = DMA_MAP_FREE;
 682 }
 683
 684 static void do_sequencer_timer(unsigned long dummy)
 685 {
 686         sequencer_timer(0);
 687 }
 688
 689
 690 static struct timer_list seq_timer =
 691                 TIMER_INITIALIZER(do_sequencer_timer, 0, 0);
 692
 693 void request_sound_timer(int count)
 694 {
 695         extern unsigned long seq_time;
 696
 697         if (count < 0) {
 698                 seq_timer.expires = (-count) + jiffies;
 699                 add_timer(&seq_timer);
 700                 return;
 701         }
 702         count += seq_time;
 703
 704         count -= jiffies;
 705
 706         if (count < 1)
 707                 count = 1;
 708
 709         seq_timer.expires = (count) + jiffies;
 710         add_timer(&seq_timer);
 711 }
 712
 713 void sound_stop_timer(void)
 714 {
 715         del_timer(&seq_timer);;
 716 }
 717
 718 void conf_printf(char *name, struct address_info *hw_config)
 719 {
 720 #ifndef CONFIG_SOUND_TRACEINIT
 721         return;
 722 #else
 723         printk("<%s> at 0x%03x", name, hw_config->io_base);
 724
 725         if (hw_config->irq)
 726                 printk(" irq %d", (hw_config->irq > 0) ? hw_config->irq : -hw_config->irq);
 727
 728         if (hw_config->dma != -1 || hw_config->dma2 != -1)
 729         {
 730                 printk(" dma %d", hw_config->dma);
 731                 if (hw_config->dma2 != -1)
 732                         printk(",%d", hw_config->dma2);
 733         }
 734         printk("\n");
 735 #endif
 736 }
 737
 738 void conf_printf2(char *name, int base, int irq, int dma, int dma2)
 739 {
 740 #ifndef CONFIG_SOUND_TRACEINIT
 741         return;
 742 #else
 743         printk("<%s> at 0x%03x", name, base);
 744
 745         if (irq)
 746                 printk(" irq %d", (irq > 0) ? irq : -irq);
 747
 748         if (dma != -1 || dma2 != -1)
 749         {
 750                   printk(" dma %d", dma);
 751                   if (dma2 != -1)
 752                           printk(",%d", dma2);
 753         }
 754         printk("\n");
 755 #endif
 756 }