sound/oss/dmasound/dmasound_q40.c

   1 /*
   2  *  linux/sound/oss/dmasound/dmasound_q40.c
   3  *
   4  *  Q40 DMA Sound Driver
   5  *
   6  *  See linux/sound/oss/dmasound/dmasound_core.c for copyright and credits
   7  *  prior to 28/01/2001
   8  *
   9  *  28/01/2001 [0.1] Iain Sandoe
  10  *                   - added versioning
  11  *                   - put in and populated the hardware_afmts field.
  12  *             [0.2] - put in SNDCTL_DSP_GETCAPS value.
  13  *             [0.3] - put in default hard/soft settings.
  14  */
  15
  16
  17 #include <linux/module.h>
  18 #include <linux/init.h>
  19 #include <linux/slab.h>
  20 #include <linux/soundcard.h>
  21 #include <linux/interrupt.h>
  22
  23 #include <asm/uaccess.h>
  24 #include <asm/q40ints.h>
  25 #include <asm/q40_master.h>
  26
  27 #include "dmasound.h"
  28
  29 #define DMASOUND_Q40_REVISION 0
  30 #define DMASOUND_Q40_EDITION 3
  31
  32 static int expand_bal;  /* Balance factor for expanding (not volume!) */
  33 static int expand_data; /* Data for expanding */
  34
  35
  36 /*** Low level stuff *********************************************************/
  37
  38
  39 static void *Q40Alloc(unsigned int size, gfp_t flags);
  40 static void Q40Free(void *, unsigned int);
  41 static int Q40IrqInit(void);
  42 #ifdef MODULE
  43 static void Q40IrqCleanUp(void);
  44 #endif
  45 static void Q40Silence(void);
  46 static void Q40Init(void);
  47 static int Q40SetFormat(int format);
  48 static int Q40SetVolume(int volume);
  49 static void Q40PlayNextFrame(int index);
  50 static void Q40Play(void);
  51 static irqreturn_t Q40StereoInterrupt(int irq, void *dummy);
  52 static irqreturn_t Q40MonoInterrupt(int irq, void *dummy);
  53 static void Q40Interrupt(void);
  54
  55
  56 /*** Mid level stuff *********************************************************/
  57
  58
  59
  60 /* userCount, frameUsed, frameLeft == byte counts */
  61 static ssize_t q40_ct_law(const u_char __user *userPtr, size_t userCount,
  62                            u_char frame[], ssize_t *frameUsed,
  63                            ssize_t frameLeft)
  64 {
  65         char *table = dmasound.soft.format == AFMT_MU_LAW ? dmasound_ulaw2dma8: dmasound_alaw2dma8;
  66         ssize_t count, used;
  67         u_char *p = (u_char *) &frame[*frameUsed];
  68
  69         used = count = min_t(size_t, userCount, frameLeft);
  70         if (copy_from_user(p,userPtr,count))
  71           return -EFAULT;
  72         while (count > 0) {
  73                 *p = table[*p]+128;
  74                 p++;
  75                 count--;
  76         }
  77         *frameUsed += used ;
  78         return used;
  79 }
  80
  81
  82 static ssize_t q40_ct_s8(const u_char __user *userPtr, size_t userCount,
  83                           u_char frame[], ssize_t *frameUsed,
  84                           ssize_t frameLeft)
  85 {
  86         ssize_t count, used;
  87         u_char *p = (u_char *) &frame[*frameUsed];
  88
  89         used = count = min_t(size_t, userCount, frameLeft);
  90         if (copy_from_user(p,userPtr,count))
  91           return -EFAULT;
  92         while (count > 0) {
  93                 *p = *p + 128;
  94                 p++;
  95                 count--;
  96         }
  97         *frameUsed += used;
  98         return used;
  99 }
 100
 101 static ssize_t q40_ct_u8(const u_char __user *userPtr, size_t userCount,
 102                           u_char frame[], ssize_t *frameUsed,
 103                           ssize_t frameLeft)
 104 {
 105         ssize_t count, used;
 106         u_char *p = (u_char *) &frame[*frameUsed];
 107
 108         used = count = min_t(size_t, userCount, frameLeft);
 109         if (copy_from_user(p,userPtr,count))
 110           return -EFAULT;
 111         *frameUsed += used;
 112         return used;
 113 }
 114
 115
 116 /* a bit too complicated to optimise right now ..*/
 117 static ssize_t q40_ctx_law(const u_char __user *userPtr, size_t userCount,
 118                             u_char frame[], ssize_t *frameUsed,
 119                             ssize_t frameLeft)
 120 {
 121         unsigned char *table = (unsigned char *)
 122                 (dmasound.soft.format == AFMT_MU_LAW ? dmasound_ulaw2dma8: dmasound_alaw2dma8);
 123         unsigned int data = expand_data;
 124         u_char *p = (u_char *) &frame[*frameUsed];
 125         int bal = expand_bal;
 126         int hSpeed = dmasound.hard.speed, sSpeed = dmasound.soft.speed;
 127         int utotal, ftotal;
 128
 129         ftotal = frameLeft;
 130         utotal = userCount;
 131         while (frameLeft) {
 132                 u_char c;
 133                 if (bal < 0) {
 134                         if (userCount == 0)
 135                                 break;
 136                         if (get_user(c, userPtr++))
 137                                 return -EFAULT;
 138                         data = table[c];
 139                         data += 0x80;
 140                         userCount--;
 141                         bal += hSpeed;
 142                 }
 143                 *p++ = data;
 144                 frameLeft--;
 145                 bal -= sSpeed;
 146         }
 147         expand_bal = bal;
 148         expand_data = data;
 149         *frameUsed += (ftotal - frameLeft);
 150         utotal -= userCount;
 151         return utotal;
 152 }
 153
 154
 155 static ssize_t q40_ctx_s8(const u_char __user *userPtr, size_t userCount,
 156                            u_char frame[], ssize_t *frameUsed,
 157                            ssize_t frameLeft)
 158 {
 159         u_char *p = (u_char *) &frame[*frameUsed];
 160         unsigned int data = expand_data;
 161         int bal = expand_bal;
 162         int hSpeed = dmasound.hard.speed, sSpeed = dmasound.soft.speed;
 163         int utotal, ftotal;
 164
 165
 166         ftotal = frameLeft;
 167         utotal = userCount;
 168         while (frameLeft) {
 169                 u_char c;
 170                 if (bal < 0) {
 171                         if (userCount == 0)
 172                                 break;
 173                         if (get_user(c, userPtr++))
 174                                 return -EFAULT;
 175                         data = c ;
 176                         data += 0x80;
 177                         userCount--;
 178                         bal += hSpeed;
 179                 }
 180                 *p++ = data;
 181                 frameLeft--;
 182                 bal -= sSpeed;
 183         }
 184         expand_bal = bal;
 185         expand_data = data;
 186         *frameUsed += (ftotal - frameLeft);
 187         utotal -= userCount;
 188         return utotal;
 189 }
 190
 191
 192 static ssize_t q40_ctx_u8(const u_char __user *userPtr, size_t userCount,
 193                            u_char frame[], ssize_t *frameUsed,
 194                            ssize_t frameLeft)
 195 {
 196         u_char *p = (u_char *) &frame[*frameUsed];
 197         unsigned int data = expand_data;
 198         int bal = expand_bal;
 199         int hSpeed = dmasound.hard.speed, sSpeed = dmasound.soft.speed;
 200         int utotal, ftotal;
 201
 202         ftotal = frameLeft;
 203         utotal = userCount;
 204         while (frameLeft) {
 205                 u_char c;
 206                 if (bal < 0) {
 207                         if (userCount == 0)
 208                                 break;
 209                         if (get_user(c, userPtr++))
 210                                 return -EFAULT;
 211                         data = c ;
 212                         userCount--;
 213                         bal += hSpeed;
 214                 }
 215                 *p++ = data;
 216                 frameLeft--;
 217                 bal -= sSpeed;
 218         }
 219         expand_bal = bal;
 220         expand_data = data;
 221         *frameUsed += (ftotal - frameLeft) ;
 222         utotal -= userCount;
 223         return utotal;
 224 }
 225
 226 /* compressing versions */
 227 static ssize_t q40_ctc_law(const u_char __user *userPtr, size_t userCount,
 228                             u_char frame[], ssize_t *frameUsed,
 229                             ssize_t frameLeft)
 230 {
 231         unsigned char *table = (unsigned char *)
 232                 (dmasound.soft.format == AFMT_MU_LAW ? dmasound_ulaw2dma8: dmasound_alaw2dma8);
 233         unsigned int data = expand_data;
 234         u_char *p = (u_char *) &frame[*frameUsed];
 235         int bal = expand_bal;
 236         int hSpeed = dmasound.hard.speed, sSpeed = dmasound.soft.speed;
 237         int utotal, ftotal;
 238
 239         ftotal = frameLeft;
 240         utotal = userCount;
 241         while (frameLeft) {
 242                 u_char c;
 243                 while(bal<0) {
 244                         if (userCount == 0)
 245                                 goto lout;
 246                         if (!(bal<(-hSpeed))) {
 247                                 if (get_user(c, userPtr))
 248                                         return -EFAULT;
 249                                 data = 0x80 + table[c];
 250                         }
 251                         userPtr++;
 252                         userCount--;
 253                         bal += hSpeed;
 254                 }
 255                 *p++ = data;
 256                 frameLeft--;
 257                 bal -= sSpeed;
 258         }
 259  lout:
 260         expand_bal = bal;
 261         expand_data = data;
 262         *frameUsed += (ftotal - frameLeft);
 263         utotal -= userCount;
 264         return utotal;
 265 }
 266
 267
 268 static ssize_t q40_ctc_s8(const u_char __user *userPtr, size_t userCount,
 269                            u_char frame[], ssize_t *frameUsed,
 270                            ssize_t frameLeft)
 271 {
 272         u_char *p = (u_char *) &frame[*frameUsed];
 273         unsigned int data = expand_data;
 274         int bal = expand_bal;
 275         int hSpeed = dmasound.hard.speed, sSpeed = dmasound.soft.speed;
 276         int utotal, ftotal;
 277
 278         ftotal = frameLeft;
 279         utotal = userCount;
 280         while (frameLeft) {
 281                 u_char c;
 282                 while (bal < 0) {
 283                         if (userCount == 0)
 284                                 goto lout;
 285                         if (!(bal<(-hSpeed))) {
 286                                 if (get_user(c, userPtr))
 287                                         return -EFAULT;
 288                                 data = c + 0x80;
 289                         }
 290                         userPtr++;
 291                         userCount--;
 292                         bal += hSpeed;
 293                 }
 294                 *p++ = data;
 295                 frameLeft--;
 296                 bal -= sSpeed;
 297         }
 298  lout:
 299         expand_bal = bal;
 300         expand_data = data;
 301         *frameUsed += (ftotal - frameLeft);
 302         utotal -= userCount;
 303         return utotal;
 304 }
 305
 306
 307 static ssize_t q40_ctc_u8(const u_char __user *userPtr, size_t userCount,
 308                            u_char frame[], ssize_t *frameUsed,
 309                            ssize_t frameLeft)
 310 {
 311         u_char *p = (u_char *) &frame[*frameUsed];
 312         unsigned int data = expand_data;
 313         int bal = expand_bal;
 314         int hSpeed = dmasound.hard.speed, sSpeed = dmasound.soft.speed;
 315         int utotal, ftotal;
 316
 317         ftotal = frameLeft;
 318         utotal = userCount;
 319         while (frameLeft) {
 320                 u_char c;
 321                 while (bal < 0) {
 322                         if (userCount == 0)
 323                                 goto lout;
 324                         if (!(bal<(-hSpeed))) {
 325                                 if (get_user(c, userPtr))
 326                                         return -EFAULT;
 327                                 data = c ;
 328                         }
 329                         userPtr++;
 330                         userCount--;
 331                         bal += hSpeed;
 332                 }
 333                 *p++ = data;
 334                 frameLeft--;
 335                 bal -= sSpeed;
 336         }
 337  lout:
 338         expand_bal = bal;
 339         expand_data = data;
 340         *frameUsed += (ftotal - frameLeft) ;
 341         utotal -= userCount;
 342         return utotal;
 343 }
 344
 345
 346 static TRANS transQ40Normal = {
 347         q40_ct_law, q40_ct_law, q40_ct_s8, q40_ct_u8, NULL, NULL, NULL, NULL
 348 };
 349
 350 static TRANS transQ40Expanding = {
 351         q40_ctx_law, q40_ctx_law, q40_ctx_s8, q40_ctx_u8, NULL, NULL, NULL, NULL
 352 };
 353
 354 static TRANS transQ40Compressing = {
 355         q40_ctc_law, q40_ctc_law, q40_ctc_s8, q40_ctc_u8, NULL, NULL, NULL, NULL
 356 };
 357
 358
 359 /*** Low level stuff *********************************************************/
 360
 361 static void *Q40Alloc(unsigned int size, gfp_t flags)
 362 {
 363          return kmalloc(size, flags); /* change to vmalloc */
 364 }
 365
 366 static void Q40Free(void *ptr, unsigned int size)
 367 {
 368         kfree(ptr);
 369 }
 370
 371 static int __init Q40IrqInit(void)
 372 {
 373         /* Register interrupt handler. */
 374         request_irq(Q40_IRQ_SAMPLE, Q40StereoInterrupt, 0,
 375                     "DMA sound", Q40Interrupt);
 376
 377         return(1);
 378 }
 379
 380
 381 #ifdef MODULE
 382 static void Q40IrqCleanUp(void)
 383 {
 384         master_outb(0,SAMPLE_ENABLE_REG);
 385         free_irq(Q40_IRQ_SAMPLE, Q40Interrupt);
 386 }
 387 #endif /* MODULE */
 388
 389
 390 static void Q40Silence(void)
 391 {
 392         master_outb(0,SAMPLE_ENABLE_REG);
 393         *DAC_LEFT=*DAC_RIGHT=127;
 394 }
 395
 396 static char *q40_pp;
 397 static unsigned int q40_sc;
 398
 399 static void Q40PlayNextFrame(int index)
 400 {
 401         u_char *start;
 402         u_long size;
 403         u_char speed;
 404
 405         /* used by Q40Play() if all doubts whether there really is something
 406          * to be played are already wiped out.
 407          */
 408         start = write_sq.buffers[write_sq.front];
 409         size = (write_sq.count == index ? write_sq.rear_size : write_sq.block_size);
 410
 411         q40_pp=start;
 412         q40_sc=size;
 413
 414         write_sq.front = (write_sq.front+1) % write_sq.max_count;
 415         write_sq.active++;
 416
 417         speed=(dmasound.hard.speed==10000 ? 0 : 1);
 418
 419         master_outb( 0,SAMPLE_ENABLE_REG);
 420         free_irq(Q40_IRQ_SAMPLE, Q40Interrupt);
 421         if (dmasound.soft.stereo)
 422                 request_irq(Q40_IRQ_SAMPLE, Q40StereoInterrupt, 0,
 423                     "Q40 sound", Q40Interrupt);
 424           else
 425                 request_irq(Q40_IRQ_SAMPLE, Q40MonoInterrupt, 0,
 426                     "Q40 sound", Q40Interrupt);
 427
 428         master_outb( speed, SAMPLE_RATE_REG);
 429         master_outb( 1,SAMPLE_CLEAR_REG);
 430         master_outb( 1,SAMPLE_ENABLE_REG);
 431 }
 432
 433 static void Q40Play(void)
 434 {
 435         unsigned long flags;
 436
 437         if (write_sq.active || write_sq.count<=0 ) {
 438                 /* There's already a frame loaded */
 439                 return;
 440         }
 441
 442         /* nothing in the queue */
 443         if (write_sq.count <= 1 && write_sq.rear_size < write_sq.block_size && !write_sq.syncing) {
 444                  /* hmmm, the only existing frame is not
 445                   * yet filled and we're not syncing?
 446                   */
 447                  return;
 448         }
 449         spin_lock_irqsave(&dmasound.lock, flags);
 450         Q40PlayNextFrame(1);
 451         spin_unlock_irqrestore(&dmasound.lock, flags);
 452 }
 453
 454 static irqreturn_t Q40StereoInterrupt(int irq, void *dummy)
 455 {
 456         spin_lock(&dmasound.lock);
 457         if (q40_sc>1){
 458             *DAC_LEFT=*q40_pp++;
 459             *DAC_RIGHT=*q40_pp++;
 460             q40_sc -=2;
 461             master_outb(1,SAMPLE_CLEAR_REG);
 462         }else Q40Interrupt();
 463         spin_unlock(&dmasound.lock);
 464         return IRQ_HANDLED;
 465 }
 466 static irqreturn_t Q40MonoInterrupt(int irq, void *dummy)
 467 {
 468         spin_lock(&dmasound.lock);
 469         if (q40_sc>0){
 470             *DAC_LEFT=*q40_pp;
 471             *DAC_RIGHT=*q40_pp++;
 472             q40_sc --;
 473             master_outb(1,SAMPLE_CLEAR_REG);
 474         }else Q40Interrupt();
 475         spin_unlock(&dmasound.lock);
 476         return IRQ_HANDLED;
 477 }
 478 static void Q40Interrupt(void)
 479 {
 480         if (!write_sq.active) {
 481                   /* playing was interrupted and sq_reset() has already cleared
 482                    * the sq variables, so better don't do anything here.
 483                    */
 484                    WAKE_UP(write_sq.sync_queue);
 485                    master_outb(0,SAMPLE_ENABLE_REG); /* better safe */
 486                    goto exit;
 487         } else write_sq.active=0;
 488         write_sq.count--;
 489         Q40Play();
 490
 491         if (q40_sc<2)
 492               { /* there was nothing to play, disable irq */
 493                 master_outb(0,SAMPLE_ENABLE_REG);
 494                 *DAC_LEFT=*DAC_RIGHT=127;
 495               }
 496         WAKE_UP(write_sq.action_queue);
 497
 498  exit:
 499         master_outb(1,SAMPLE_CLEAR_REG);
 500 }
 501
 502
 503 static void Q40Init(void)
 504 {
 505         int i, idx;
 506         const int freq[] = {10000, 20000};
 507
 508         /* search a frequency that fits into the allowed error range */
 509
 510         idx = -1;
 511         for (i = 0; i < 2; i++)
 512                 if ((100 * abs(dmasound.soft.speed - freq[i]) / freq[i]) <= catchRadius)
 513                         idx = i;
 514
 515         dmasound.hard = dmasound.soft;
 516         /*sound.hard.stereo=1;*/ /* no longer true */
 517         dmasound.hard.size=8;
 518
 519         if (idx > -1) {
 520                 dmasound.soft.speed = freq[idx];
 521                 dmasound.trans_write = &transQ40Normal;
 522         } else
 523                 dmasound.trans_write = &transQ40Expanding;
 524
 525         Q40Silence();
 526
 527         if (dmasound.hard.speed > 20200) {
 528                 /* squeeze the sound, we do that */
 529                 dmasound.hard.speed = 20000;
 530                 dmasound.trans_write = &transQ40Compressing;
 531         } else if (dmasound.hard.speed > 10000) {
 532                 dmasound.hard.speed = 20000;
 533         } else {
 534                 dmasound.hard.speed = 10000;
 535         }
 536         expand_bal = -dmasound.soft.speed;
 537 }
 538
 539
 540 static int Q40SetFormat(int format)
 541 {
 542         /* Q40 sound supports only 8bit modes */
 543
 544         switch (format) {
 545         case AFMT_QUERY:
 546                 return(dmasound.soft.format);
 547         case AFMT_MU_LAW:
 548         case AFMT_A_LAW:
 549         case AFMT_S8:
 550         case AFMT_U8:
 551                 break;
 552         default:
 553                 format = AFMT_S8;
 554         }
 555
 556         dmasound.soft.format = format;
 557         dmasound.soft.size = 8;
 558         if (dmasound.minDev == SND_DEV_DSP) {
 559                 dmasound.dsp.format = format;
 560                 dmasound.dsp.size = 8;
 561         }
 562         Q40Init();
 563
 564         return(format);
 565 }
 566
 567 static int Q40SetVolume(int volume)
 568 {
 569     return 0;
 570 }
 571
 572
 573 /*** Machine definitions *****************************************************/
 574
 575 static SETTINGS def_hard = {
 576         .format = AFMT_U8,
 577         .stereo = 0,
 578         .size   = 8,
 579         .speed  = 10000
 580 } ;
 581
 582 static SETTINGS def_soft = {
 583         .format = AFMT_U8,
 584         .stereo = 0,
 585         .size   = 8,
 586         .speed  = 8000
 587 } ;
 588
 589 static MACHINE machQ40 = {
 590         .name           = "Q40",
 591         .name2          = "Q40",
 592         .owner          = THIS_MODULE,
 593         .dma_alloc      = Q40Alloc,
 594         .dma_free       = Q40Free,
 595         .irqinit        = Q40IrqInit,
 596 #ifdef MODULE
 597         .irqcleanup     = Q40IrqCleanUp,
 598 #endif /* MODULE */
 599         .init           = Q40Init,
 600         .silence        = Q40Silence,
 601         .setFormat      = Q40SetFormat,
 602         .setVolume      = Q40SetVolume,
 603         .play           = Q40Play,
 604         .min_dsp_speed  = 10000,
 605         .version        = ((DMASOUND_Q40_REVISION<<8) | DMASOUND_Q40_EDITION),
 606         .hardware_afmts = AFMT_U8, /* h'ware-supported formats *only* here */
 607         .capabilities   = DSP_CAP_BATCH  /* As per SNDCTL_DSP_GETCAPS */
 608 };
 609
 610
 611 /*** Config & Setup **********************************************************/
 612
 613
 614 int __init dmasound_q40_init(void)
 615 {
 616         if (MACH_IS_Q40) {
 617             dmasound.mach = machQ40;
 618             dmasound.mach.default_hard = def_hard ;
 619             dmasound.mach.default_soft = def_soft ;
 620             return dmasound_init();
 621         } else
 622             return -ENODEV;
 623 }
 624
 625 static void __exit dmasound_q40_cleanup(void)
 626 {
 627         dmasound_deinit();
 628 }
 629
 630 module_init(dmasound_q40_init);
 631 module_exit(dmasound_q40_cleanup);
 632
 633 MODULE_DESCRIPTION("Q40/Q60 sound driver");
 634 MODULE_LICENSE("GPL");