drivers/sound/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 <asm/segment.h>
  39 #include <linux/wait.h>
  40 #include <linux/malloc.h>
  41 #include <linux/ioport.h>
  42 #include <linux/devfs_fs_kernel.h>
  43 #include <linux/major.h>
  44 #include <linux/delay.h>
  45 #include <linux/proc_fs.h>
  46 #include <linux/smp_lock.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 long long sound_lseek(struct file *file, long long offset, int orig)
 206 {
 207         return -ESPIPE;
 208 }
 209
 210 static int sound_open(struct inode *inode, struct file *file)
 211 {
 212         int dev = MINOR(inode->i_rdev);
 213         int retval;
 214
 215         DEB(printk("sound_open(dev=%d)\n", dev));
 216         if ((dev >= SND_NDEVS) || (dev < 0)) {
 217                 printk(KERN_ERR "Invalid minor device %d\n", dev);
 218                 return -ENXIO;
 219         }
 220         switch (dev & 0x0f) {
 221         case SND_DEV_CTL:
 222                 dev >>= 4;
 223                 if (dev >= 0 && dev < MAX_MIXER_DEV && mixer_devs[dev] == NULL) {
 224                         char modname[20];
 225                         sprintf(modname, "mixer%d", dev);
 226                         request_module(modname);
 227                 }
 228                 if (dev && (dev >= num_mixers || mixer_devs[dev] == NULL))
 229                         return -ENXIO;
 230
 231                 if (mixer_devs[dev]->owner)
 232                         __MOD_INC_USE_COUNT (mixer_devs[dev]->owner);
 233                 break;
 234
 235         case SND_DEV_SEQ:
 236         case SND_DEV_SEQ2:
 237                 if ((retval = sequencer_open(dev, file)) < 0)
 238                         return retval;
 239                 break;
 240
 241         case SND_DEV_MIDIN:
 242                 if ((retval = MIDIbuf_open(dev, file)) < 0)
 243                         return retval;
 244                 break;
 245
 246         case SND_DEV_DSP:
 247         case SND_DEV_DSP16:
 248         case SND_DEV_AUDIO:
 249                 if ((retval = audio_open(dev, file)) < 0)
 250                         return retval;
 251                 break;
 252
 253         default:
 254                 printk(KERN_ERR "Invalid minor device %d\n", dev);
 255                 return -ENXIO;
 256         }
 257
 258         return 0;
 259 }
 260
 261 static int sound_release(struct inode *inode, struct file *file)
 262 {
 263         int dev = MINOR(inode->i_rdev);
 264
 265         lock_kernel();
 266         DEB(printk("sound_release(dev=%d)\n", dev));
 267         switch (dev & 0x0f) {
 268         case SND_DEV_CTL:
 269                 dev >>= 4;
 270                 if (mixer_devs[dev]->owner)
 271                         __MOD_DEC_USE_COUNT (mixer_devs[dev]->owner);
 272                 break;
 273
 274         case SND_DEV_SEQ:
 275         case SND_DEV_SEQ2:
 276                 sequencer_release(dev, file);
 277                 break;
 278
 279         case SND_DEV_MIDIN:
 280                 MIDIbuf_release(dev, file);
 281                 break;
 282
 283         case SND_DEV_DSP:
 284         case SND_DEV_DSP16:
 285         case SND_DEV_AUDIO:
 286                 audio_release(dev, file);
 287                 break;
 288
 289         default:
 290                 printk(KERN_ERR "Sound error: Releasing unknown device 0x%02x\n", dev);
 291         }
 292         unlock_kernel();
 293
 294         return 0;
 295 }
 296
 297 static int get_mixer_info(int dev, caddr_t arg)
 298 {
 299         mixer_info info;
 300
 301         strncpy(info.id, mixer_devs[dev]->id, sizeof(info.id));
 302         strncpy(info.name, mixer_devs[dev]->name, sizeof(info.name));
 303         info.name[sizeof(info.name)-1] = 0;
 304         info.modify_counter = mixer_devs[dev]->modify_counter;
 305         if (__copy_to_user(arg, &info,  sizeof(info)))
 306                 return -EFAULT;
 307         return 0;
 308 }
 309
 310 static int get_old_mixer_info(int dev, caddr_t arg)
 311 {
 312         _old_mixer_info info;
 313
 314         strncpy(info.id, mixer_devs[dev]->id, sizeof(info.id));
 315         strncpy(info.name, mixer_devs[dev]->name, sizeof(info.name));
 316         info.name[sizeof(info.name)-1] = 0;
 317         if (copy_to_user(arg, &info,  sizeof(info)))
 318                 return -EFAULT;
 319         return 0;
 320 }
 321
 322 static int sound_mixer_ioctl(int mixdev, unsigned int cmd, caddr_t arg)
 323 {
 324         if (mixdev < 0 || mixdev >= MAX_MIXER_DEV)
 325                 return -ENXIO;
 326         /* Try to load the mixer... */
 327         if (mixer_devs[mixdev] == NULL) {
 328                 char modname[20];
 329                 sprintf(modname, "mixer%d", mixdev);
 330                 request_module(modname);
 331         }
 332         if (mixdev >= num_mixers || !mixer_devs[mixdev])
 333                 return -ENXIO;
 334         if (cmd == SOUND_MIXER_INFO)
 335                 return get_mixer_info(mixdev, arg);
 336         if (cmd == SOUND_OLD_MIXER_INFO)
 337                 return get_old_mixer_info(mixdev, arg);
 338         if (_SIOC_DIR(cmd) & _SIOC_WRITE)
 339                 mixer_devs[mixdev]->modify_counter++;
 340         if (!mixer_devs[mixdev]->ioctl)
 341                 return -EINVAL;
 342         return mixer_devs[mixdev]->ioctl(mixdev, cmd, arg);
 343 }
 344
 345 static int sound_ioctl(struct inode *inode, struct file *file,
 346                        unsigned int cmd, unsigned long arg)
 347 {
 348         int err, len = 0, dtype;
 349         int dev = MINOR(inode->i_rdev);
 350
 351         if (_SIOC_DIR(cmd) != _SIOC_NONE && _SIOC_DIR(cmd) != 0) {
 352                 /*
 353                  * Have to validate the address given by the process.
 354                  */
 355                 len = _SIOC_SIZE(cmd);
 356                 if (len < 1 || len > 65536 || arg == 0)
 357                         return -EFAULT;
 358                 if (_SIOC_DIR(cmd) & _SIOC_WRITE)
 359                         if ((err = verify_area(VERIFY_READ, (void *)arg, len)) < 0)
 360                                 return err;
 361                 if (_SIOC_DIR(cmd) & _SIOC_READ)
 362                         if ((err = verify_area(VERIFY_WRITE, (void *)arg, len)) < 0)
 363                                 return err;
 364         }
 365         DEB(printk("sound_ioctl(dev=%d, cmd=0x%x, arg=0x%x)\n", dev, cmd, arg));
 366         if (cmd == OSS_GETVERSION)
 367                 return __put_user(SOUND_VERSION, (int *)arg);
 368
 369         if (_IOC_TYPE(cmd) == 'M' && num_mixers > 0 &&   /* Mixer ioctl */
 370             (dev & 0x0f) != SND_DEV_CTL) {
 371                 dtype = dev & 0x0f;
 372                 switch (dtype) {
 373                 case SND_DEV_DSP:
 374                 case SND_DEV_DSP16:
 375                 case SND_DEV_AUDIO:
 376                         return sound_mixer_ioctl(audio_devs[dev >> 4]->mixer_dev,
 377                                                  cmd, (caddr_t)arg);
 378
 379                 default:
 380                         return sound_mixer_ioctl(dev >> 4, cmd, (caddr_t)arg);
 381                 }
 382         }
 383         switch (dev & 0x0f) {
 384         case SND_DEV_CTL:
 385                 if (cmd == SOUND_MIXER_GETLEVELS)
 386                         return get_mixer_levels((caddr_t)arg);
 387                 if (cmd == SOUND_MIXER_SETLEVELS)
 388                         return set_mixer_levels((caddr_t)arg);
 389                 return sound_mixer_ioctl(dev >> 4, cmd, (caddr_t)arg);
 390
 391         case SND_DEV_SEQ:
 392         case SND_DEV_SEQ2:
 393                 return sequencer_ioctl(dev, file, cmd, (caddr_t)arg);
 394
 395         case SND_DEV_DSP:
 396         case SND_DEV_DSP16:
 397         case SND_DEV_AUDIO:
 398                 return audio_ioctl(dev, file, cmd, (caddr_t)arg);
 399                 break;
 400
 401         case SND_DEV_MIDIN:
 402                 return MIDIbuf_ioctl(dev, file, cmd, (caddr_t)arg);
 403                 break;
 404
 405         }
 406         return -EINVAL;
 407 }
 408
 409 static unsigned int sound_poll(struct file *file, poll_table * wait)
 410 {
 411         struct inode *inode = file->f_dentry->d_inode;
 412         int dev = MINOR(inode->i_rdev);
 413
 414         DEB(printk("sound_poll(dev=%d)\n", dev));
 415         switch (dev & 0x0f) {
 416         case SND_DEV_SEQ:
 417         case SND_DEV_SEQ2:
 418                 return sequencer_poll(dev, file, wait);
 419
 420         case SND_DEV_MIDIN:
 421                 return MIDIbuf_poll(dev, file, wait);
 422
 423         case SND_DEV_DSP:
 424         case SND_DEV_DSP16:
 425         case SND_DEV_AUDIO:
 426                 return DMAbuf_poll(file, dev >> 4, wait);
 427         }
 428         return 0;
 429 }
 430
 431 static int sound_mmap(struct file *file, struct vm_area_struct *vma)
 432 {
 433         int dev_class;
 434         unsigned long size;
 435         struct dma_buffparms *dmap = NULL;
 436         int dev = MINOR(file->f_dentry->d_inode->i_rdev);
 437
 438         dev_class = dev & 0x0f;
 439         dev >>= 4;
 440
 441         if (dev_class != SND_DEV_DSP && dev_class != SND_DEV_DSP16 && dev_class != SND_DEV_AUDIO) {
 442                 printk(KERN_ERR "Sound: mmap() not supported for other than audio devices\n");
 443                 return -EINVAL;
 444         }
 445         lock_kernel();
 446         if (vma->vm_flags & VM_WRITE)   /* Map write and read/write to the output buf */
 447                 dmap = audio_devs[dev]->dmap_out;
 448         else if (vma->vm_flags & VM_READ)
 449                 dmap = audio_devs[dev]->dmap_in;
 450         else {
 451                 printk(KERN_ERR "Sound: Undefined mmap() access\n");
 452                 unlock_kernel();
 453                 return -EINVAL;
 454         }
 455
 456         if (dmap == NULL) {
 457                 printk(KERN_ERR "Sound: mmap() error. dmap == NULL\n");
 458                 unlock_kernel();
 459                 return -EIO;
 460         }
 461         if (dmap->raw_buf == NULL) {
 462                 printk(KERN_ERR "Sound: mmap() called when raw_buf == NULL\n");
 463                 unlock_kernel();
 464                 return -EIO;
 465         }
 466         if (dmap->mapping_flags) {
 467                 printk(KERN_ERR "Sound: mmap() called twice for the same DMA buffer\n");
 468                 unlock_kernel();
 469                 return -EIO;
 470         }
 471         if (vma->vm_pgoff != 0) {
 472                 printk(KERN_ERR "Sound: mmap() offset must be 0.\n");
 473                 unlock_kernel();
 474                 return -EINVAL;
 475         }
 476         size = vma->vm_end - vma->vm_start;
 477
 478         if (size != dmap->bytes_in_use) {
 479                 printk(KERN_WARNING "Sound: mmap() size = %ld. Should be %d\n", size, dmap->bytes_in_use);
 480         }
 481         if (remap_page_range(vma->vm_start, virt_to_phys(dmap->raw_buf),
 482                 vma->vm_end - vma->vm_start,
 483                 vma->vm_page_prot)) {
 484                 unlock_kernel();
 485                 return -EAGAIN;
 486         }
 487
 488         dmap->mapping_flags |= DMA_MAP_MAPPED;
 489
 490         if( audio_devs[dev]->d->mmap)
 491                 audio_devs[dev]->d->mmap(dev);
 492
 493         memset(dmap->raw_buf,
 494                dmap->neutral_byte,
 495                dmap->bytes_in_use);
 496         unlock_kernel();
 497         return 0;
 498 }
 499
 500 struct file_operations oss_sound_fops = {
 501         owner:          THIS_MODULE,
 502         llseek:         sound_lseek,
 503         read:           sound_read,
 504         write:          sound_write,
 505         poll:           sound_poll,
 506         ioctl:          sound_ioctl,
 507         mmap:           sound_mmap,
 508         open:           sound_open,
 509         release:        sound_release,
 510 };
 511
 512 /*
 513  *      Create the required special subdevices
 514  */
 515
 516 static int create_special_devices(void)
 517 {
 518         int seq1,seq2;
 519         seq1=register_sound_special(&oss_sound_fops, 1);
 520         if(seq1==-1)
 521                 goto bad;
 522         seq2=register_sound_special(&oss_sound_fops, 8);
 523         if(seq2!=-1)
 524                 return 0;
 525         unregister_sound_special(1);
 526 bad:
 527         return -1;
 528 }
 529
 530
 531 /* These device names follow the official Linux device list,
 532  * Documentation/devices.txt.  Let us know if there are other
 533  * common names we should support for compatibility.
 534  * Only those devices not created by the generic code in sound_core.c are
 535  * registered here.
 536  */
 537 static const struct {
 538         unsigned short minor;
 539         char *name;
 540         umode_t mode;
 541         int *num;
 542 } dev_list[] = { /* list of minor devices */
 543 /* seems to be some confusion here -- this device is not in the device list */
 544         {SND_DEV_DSP16,     "dspW",      S_IWUGO | S_IRUSR | S_IRGRP,
 545          &num_audiodevs},
 546         {SND_DEV_AUDIO,     "audio",     S_IWUGO | S_IRUSR | S_IRGRP,
 547          &num_audiodevs},
 548 };
 549
 550 static char *
 551 soundcard_make_name(char *buf, char *name, int idx) {
 552         if (idx==0)
 553                 sprintf(buf, "sound/%s", name);
 554         else
 555                 sprintf(buf, "sound/%s%d", name, idx);
 556         return buf;
 557 }
 558
 559 /* Register/unregister audio entries */
 560 static void soundcard_register_devfs (int do_register)
 561 {
 562         char name_buf[32];
 563         int i, j, num;
 564
 565         for (i = 0; i < sizeof (dev_list) / sizeof *dev_list; i++) {
 566                 num = (dev_list[i].num == NULL) ? 0 : *dev_list[i].num;
 567                 for (j = 0; j < num || j == 0; j++) {
 568                         soundcard_make_name (name_buf, dev_list[i].name, j);
 569                         if (do_register)
 570                                 devfs_register (NULL, name_buf, DEVFS_FL_NONE,
 571                                         SOUND_MAJOR, dev_list[i].minor+ (j* 0x10),
 572                                         S_IFCHR | dev_list[i].mode,
 573                                         &oss_sound_fops, NULL);
 574                         else {
 575                                 devfs_handle_t de;
 576
 577                                 de = devfs_find_handle (NULL, name_buf, 0, 0,
 578                                         DEVFS_SPECIAL_CHR, 0);
 579                                 devfs_unregister (de);
 580                         }
 581                 }
 582         }
 583 }
 584
 585
 586 static int dmabuf = 0;
 587 static int dmabug = 0;
 588
 589 MODULE_PARM(dmabuf, "i");
 590 MODULE_PARM(dmabug, "i");
 591
 592 static int __init oss_init(void)
 593 {
 594         int             err;
 595
 596         /* drag in sound_syms.o */
 597         {
 598                 extern char sound_syms_symbol;
 599                 sound_syms_symbol = 0;
 600         }
 601
 602 #ifdef CONFIG_PCI
 603         if(dmabug)
 604                 isa_dma_bridge_buggy = dmabug;
 605 #endif
 606
 607         err = create_special_devices();
 608         if (err) {
 609                 printk(KERN_ERR "sound: driver already loaded/included in kernel\n");
 610                 return err;
 611         }
 612
 613         /* Protecting the innocent */
 614         sound_dmap_flag = (dmabuf > 0 ? 1 : 0);
 615
 616         soundcard_register_devfs(1);
 617
 618         if (sound_nblocks >= 1024)
 619                 printk(KERN_ERR "Sound warning: Deallocation table was too small.\n");
 620
 621         return 0;
 622 }
 623
 624 static void __exit oss_cleanup(void)
 625 {
 626         int i;
 627
 628         if (MOD_IN_USE)
 629                 return;
 630
 631         soundcard_register_devfs (0);
 632
 633         unregister_sound_special(1);
 634         unregister_sound_special(8);
 635
 636         sound_stop_timer();
 637
 638         sequencer_unload();
 639
 640         for (i = 0; i < MAX_DMA_CHANNELS; i++)
 641                 if (dma_alloc_map[i] != DMA_MAP_UNAVAIL) {
 642                         printk(KERN_ERR "Sound: Hmm, DMA%d was left allocated - fixed\n", i);
 643                         sound_free_dma(i);
 644                 }
 645
 646         for (i = 0; i < sound_nblocks; i++)
 647                 vfree(sound_mem_blocks[i]);
 648
 649 }
 650
 651 module_init(oss_init);
 652 module_exit(oss_cleanup);
 653
 654
 655 int sound_alloc_dma(int chn, char *deviceID)
 656 {
 657         int err;
 658
 659         if ((err = request_dma(chn, deviceID)) != 0)
 660                 return err;
 661
 662         dma_alloc_map[chn] = DMA_MAP_FREE;
 663
 664         return 0;
 665 }
 666
 667 int sound_open_dma(int chn, char *deviceID)
 668 {
 669         unsigned long   flags;
 670
 671         if (!valid_dma(chn)) {
 672                 printk(KERN_ERR "sound_open_dma: Invalid DMA channel %d\n", chn);
 673                 return 1;
 674         }
 675         save_flags(flags);
 676         cli();
 677
 678         if (dma_alloc_map[chn] != DMA_MAP_FREE) {
 679                 printk("sound_open_dma: DMA channel %d busy or not allocated (%d)\n", chn, dma_alloc_map[chn]);
 680                 restore_flags(flags);
 681                 return 1;
 682         }
 683         dma_alloc_map[chn] = DMA_MAP_BUSY;
 684         restore_flags(flags);
 685         return 0;
 686 }
 687
 688 void sound_free_dma(int chn)
 689 {
 690         if (dma_alloc_map[chn] == DMA_MAP_UNAVAIL) {
 691                 /* printk( "sound_free_dma: Bad access to DMA channel %d\n",  chn); */
 692                 return;
 693         }
 694         free_dma(chn);
 695         dma_alloc_map[chn] = DMA_MAP_UNAVAIL;
 696 }
 697
 698 void sound_close_dma(int chn)
 699 {
 700         unsigned long   flags;
 701
 702         save_flags(flags);
 703         cli();
 704
 705         if (dma_alloc_map[chn] != DMA_MAP_BUSY) {
 706                 printk(KERN_ERR "sound_close_dma: Bad access to DMA channel %d\n", chn);
 707                 restore_flags(flags);
 708                 return;
 709         }
 710         dma_alloc_map[chn] = DMA_MAP_FREE;
 711         restore_flags(flags);
 712 }
 713
 714 static void do_sequencer_timer(unsigned long dummy)
 715 {
 716         sequencer_timer(0);
 717 }
 718
 719
 720 static struct timer_list seq_timer =
 721 {function: do_sequencer_timer};
 722
 723 void request_sound_timer(int count)
 724 {
 725         extern unsigned long seq_time;
 726
 727         if (count < 0) {
 728                 seq_timer.expires = (-count) + jiffies;
 729                 add_timer(&seq_timer);
 730                 return;
 731         }
 732         count += seq_time;
 733
 734         count -= jiffies;
 735
 736         if (count < 1)
 737                 count = 1;
 738
 739         seq_timer.expires = (count) + jiffies;
 740         add_timer(&seq_timer);
 741 }
 742
 743 void sound_stop_timer(void)
 744 {
 745         del_timer(&seq_timer);;
 746 }
 747
 748 void conf_printf(char *name, struct address_info *hw_config)
 749 {
 750 #ifndef CONFIG_SOUND_TRACEINIT
 751         return;
 752 #else
 753         printk("<%s> at 0x%03x", name, hw_config->io_base);
 754
 755         if (hw_config->irq)
 756                 printk(" irq %d", (hw_config->irq > 0) ? hw_config->irq : -hw_config->irq);
 757
 758         if (hw_config->dma != -1 || hw_config->dma2 != -1)
 759         {
 760                 printk(" dma %d", hw_config->dma);
 761                 if (hw_config->dma2 != -1)
 762                         printk(",%d", hw_config->dma2);
 763         }
 764         printk("\n");
 765 #endif
 766 }
 767
 768 void conf_printf2(char *name, int base, int irq, int dma, int dma2)
 769 {
 770 #ifndef CONFIG_SOUND_TRACEINIT
 771         return;
 772 #else
 773         printk("<%s> at 0x%03x", name, base);
 774
 775         if (irq)
 776                 printk(" irq %d", (irq > 0) ? irq : -irq);
 777
 778         if (dma != -1 || dma2 != -1)
 779         {
 780                   printk(" dma %d", dma);
 781                   if (dma2 != -1)
 782                           printk(",%d", dma2);
 783         }
 784         printk("\n");
 785 #endif
 786 }