linux/sound/oss/dmasound/dmasound_paula.c
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   1/*
   2 *  linux/sound/oss/dmasound/dmasound_paula.c
   3 *
   4 *  Amiga `Paula' 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 constraint on state buffer usage.
  14 *             [0.4] - put in default hard/soft settings
  15*/
  16
  17
  18#include <linux/module.h>
  19#include <linux/mm.h>
  20#include <linux/init.h>
  21#include <linux/ioport.h>
  22#include <linux/soundcard.h>
  23#include <linux/interrupt.h>
  24#include <linux/platform_device.h>
  25
  26#include <asm/uaccess.h>
  27#include <asm/setup.h>
  28#include <asm/amigahw.h>
  29#include <asm/amigaints.h>
  30#include <asm/machdep.h>
  31
  32#include "dmasound.h"
  33
  34#define DMASOUND_PAULA_REVISION 0
  35#define DMASOUND_PAULA_EDITION 4
  36
  37#define custom amiga_custom
  38   /*
  39    *   The minimum period for audio depends on htotal (for OCS/ECS/AGA)
  40    *   (Imported from arch/m68k/amiga/amisound.c)
  41    */
  42
  43extern volatile u_short amiga_audio_min_period;
  44
  45
  46   /*
  47    *   amiga_mksound() should be able to restore the period after beeping
  48    *   (Imported from arch/m68k/amiga/amisound.c)
  49    */
  50
  51extern u_short amiga_audio_period;
  52
  53
  54   /*
  55    *   Audio DMA masks
  56    */
  57
  58#define AMI_AUDIO_OFF   (DMAF_AUD0 | DMAF_AUD1 | DMAF_AUD2 | DMAF_AUD3)
  59#define AMI_AUDIO_8     (DMAF_SETCLR | DMAF_MASTER | DMAF_AUD0 | DMAF_AUD1)
  60#define AMI_AUDIO_14    (AMI_AUDIO_8 | DMAF_AUD2 | DMAF_AUD3)
  61
  62
  63    /*
  64     *  Helper pointers for 16(14)-bit sound
  65     */
  66
  67static int write_sq_block_size_half, write_sq_block_size_quarter;
  68
  69
  70/*** Low level stuff *********************************************************/
  71
  72
  73static void *AmiAlloc(unsigned int size, gfp_t flags);
  74static void AmiFree(void *obj, unsigned int size);
  75static int AmiIrqInit(void);
  76#ifdef MODULE
  77static void AmiIrqCleanUp(void);
  78#endif
  79static void AmiSilence(void);
  80static void AmiInit(void);
  81static int AmiSetFormat(int format);
  82static int AmiSetVolume(int volume);
  83static int AmiSetTreble(int treble);
  84static void AmiPlayNextFrame(int index);
  85static void AmiPlay(void);
  86static irqreturn_t AmiInterrupt(int irq, void *dummy);
  87
  88#ifdef CONFIG_HEARTBEAT
  89
  90    /*
  91     *  Heartbeat interferes with sound since the 7 kHz low-pass filter and the
  92     *  power LED are controlled by the same line.
  93     */
  94
  95static void (*saved_heartbeat)(int) = NULL;
  96
  97static inline void disable_heartbeat(void)
  98{
  99        if (mach_heartbeat) {
 100            saved_heartbeat = mach_heartbeat;
 101            mach_heartbeat = NULL;
 102        }
 103        AmiSetTreble(dmasound.treble);
 104}
 105
 106static inline void enable_heartbeat(void)
 107{
 108        if (saved_heartbeat)
 109            mach_heartbeat = saved_heartbeat;
 110}
 111#else /* !CONFIG_HEARTBEAT */
 112#define disable_heartbeat()     do { } while (0)
 113#define enable_heartbeat()      do { } while (0)
 114#endif /* !CONFIG_HEARTBEAT */
 115
 116
 117/*** Mid level stuff *********************************************************/
 118
 119static void AmiMixerInit(void);
 120static int AmiMixerIoctl(u_int cmd, u_long arg);
 121static int AmiWriteSqSetup(void);
 122static int AmiStateInfo(char *buffer, size_t space);
 123
 124
 125/*** Translations ************************************************************/
 126
 127/* ++TeSche: radically changed for new expanding purposes...
 128 *
 129 * These two routines now deal with copying/expanding/translating the samples
 130 * from user space into our buffer at the right frequency. They take care about
 131 * how much data there's actually to read, how much buffer space there is and
 132 * to convert samples into the right frequency/encoding. They will only work on
 133 * complete samples so it may happen they leave some bytes in the input stream
 134 * if the user didn't write a multiple of the current sample size. They both
 135 * return the number of bytes they've used from both streams so you may detect
 136 * such a situation. Luckily all programs should be able to cope with that.
 137 *
 138 * I think I've optimized anything as far as one can do in plain C, all
 139 * variables should fit in registers and the loops are really short. There's
 140 * one loop for every possible situation. Writing a more generalized and thus
 141 * parameterized loop would only produce slower code. Feel free to optimize
 142 * this in assembler if you like. :)
 143 *
 144 * I think these routines belong here because they're not yet really hardware
 145 * independent, especially the fact that the Falcon can play 16bit samples
 146 * only in stereo is hardcoded in both of them!
 147 *
 148 * ++geert: split in even more functions (one per format)
 149 */
 150
 151
 152    /*
 153     *  Native format
 154     */
 155
 156static ssize_t ami_ct_s8(const u_char __user *userPtr, size_t userCount,
 157                         u_char frame[], ssize_t *frameUsed, ssize_t frameLeft)
 158{
 159        ssize_t count, used;
 160
 161        if (!dmasound.soft.stereo) {
 162                void *p = &frame[*frameUsed];
 163                count = min_t(unsigned long, userCount, frameLeft) & ~1;
 164                used = count;
 165                if (copy_from_user(p, userPtr, count))
 166                        return -EFAULT;
 167        } else {
 168                u_char *left = &frame[*frameUsed>>1];
 169                u_char *right = left+write_sq_block_size_half;
 170                count = min_t(unsigned long, userCount, frameLeft)>>1 & ~1;
 171                used = count*2;
 172                while (count > 0) {
 173                        if (get_user(*left++, userPtr++)
 174                            || get_user(*right++, userPtr++))
 175                                return -EFAULT;
 176                        count--;
 177                }
 178        }
 179        *frameUsed += used;
 180        return used;
 181}
 182
 183
 184    /*
 185     *  Copy and convert 8 bit data
 186     */
 187
 188#define GENERATE_AMI_CT8(funcname, convsample)                          \
 189static ssize_t funcname(const u_char __user *userPtr, size_t userCount, \
 190                        u_char frame[], ssize_t *frameUsed,             \
 191                        ssize_t frameLeft)                              \
 192{                                                                       \
 193        ssize_t count, used;                                            \
 194                                                                        \
 195        if (!dmasound.soft.stereo) {                                    \
 196                u_char *p = &frame[*frameUsed];                         \
 197                count = min_t(size_t, userCount, frameLeft) & ~1;       \
 198                used = count;                                           \
 199                while (count > 0) {                                     \
 200                        u_char data;                                    \
 201                        if (get_user(data, userPtr++))                  \
 202                                return -EFAULT;                         \
 203                        *p++ = convsample(data);                        \
 204                        count--;                                        \
 205                }                                                       \
 206        } else {                                                        \
 207                u_char *left = &frame[*frameUsed>>1];                   \
 208                u_char *right = left+write_sq_block_size_half;          \
 209                count = min_t(size_t, userCount, frameLeft)>>1 & ~1;    \
 210                used = count*2;                                         \
 211                while (count > 0) {                                     \
 212                        u_char data;                                    \
 213                        if (get_user(data, userPtr++))                  \
 214                                return -EFAULT;                         \
 215                        *left++ = convsample(data);                     \
 216                        if (get_user(data, userPtr++))                  \
 217                                return -EFAULT;                         \
 218                        *right++ = convsample(data);                    \
 219                        count--;                                        \
 220                }                                                       \
 221        }                                                               \
 222        *frameUsed += used;                                             \
 223        return used;                                                    \
 224}
 225
 226#define AMI_CT_ULAW(x)  (dmasound_ulaw2dma8[(x)])
 227#define AMI_CT_ALAW(x)  (dmasound_alaw2dma8[(x)])
 228#define AMI_CT_U8(x)    ((x) ^ 0x80)
 229
 230GENERATE_AMI_CT8(ami_ct_ulaw, AMI_CT_ULAW)
 231GENERATE_AMI_CT8(ami_ct_alaw, AMI_CT_ALAW)
 232GENERATE_AMI_CT8(ami_ct_u8, AMI_CT_U8)
 233
 234
 235    /*
 236     *  Copy and convert 16 bit data
 237     */
 238
 239#define GENERATE_AMI_CT_16(funcname, convsample)                        \
 240static ssize_t funcname(const u_char __user *userPtr, size_t userCount, \
 241                        u_char frame[], ssize_t *frameUsed,             \
 242                        ssize_t frameLeft)                              \
 243{                                                                       \
 244        const u_short __user *ptr = (const u_short __user *)userPtr;    \
 245        ssize_t count, used;                                            \
 246        u_short data;                                                   \
 247                                                                        \
 248        if (!dmasound.soft.stereo) {                                    \
 249                u_char *high = &frame[*frameUsed>>1];                   \
 250                u_char *low = high+write_sq_block_size_half;            \
 251                count = min_t(size_t, userCount, frameLeft)>>1 & ~1;    \
 252                used = count*2;                                         \
 253                while (count > 0) {                                     \
 254                        if (get_user(data, ptr++))                      \
 255                                return -EFAULT;                         \
 256                        data = convsample(data);                        \
 257                        *high++ = data>>8;                              \
 258                        *low++ = (data>>2) & 0x3f;                      \
 259                        count--;                                        \
 260                }                                                       \
 261        } else {                                                        \
 262                u_char *lefth = &frame[*frameUsed>>2];                  \
 263                u_char *leftl = lefth+write_sq_block_size_quarter;      \
 264                u_char *righth = lefth+write_sq_block_size_half;        \
 265                u_char *rightl = righth+write_sq_block_size_quarter;    \
 266                count = min_t(size_t, userCount, frameLeft)>>2 & ~1;    \
 267                used = count*4;                                         \
 268                while (count > 0) {                                     \
 269                        if (get_user(data, ptr++))                      \
 270                                return -EFAULT;                         \
 271                        data = convsample(data);                        \
 272                        *lefth++ = data>>8;                             \
 273                        *leftl++ = (data>>2) & 0x3f;                    \
 274                        if (get_user(data, ptr++))                      \
 275                                return -EFAULT;                         \
 276                        data = convsample(data);                        \
 277                        *righth++ = data>>8;                            \
 278                        *rightl++ = (data>>2) & 0x3f;                   \
 279                        count--;                                        \
 280                }                                                       \
 281        }                                                               \
 282        *frameUsed += used;                                             \
 283        return used;                                                    \
 284}
 285
 286#define AMI_CT_S16BE(x) (x)
 287#define AMI_CT_U16BE(x) ((x) ^ 0x8000)
 288#define AMI_CT_S16LE(x) (le2be16((x)))
 289#define AMI_CT_U16LE(x) (le2be16((x)) ^ 0x8000)
 290
 291GENERATE_AMI_CT_16(ami_ct_s16be, AMI_CT_S16BE)
 292GENERATE_AMI_CT_16(ami_ct_u16be, AMI_CT_U16BE)
 293GENERATE_AMI_CT_16(ami_ct_s16le, AMI_CT_S16LE)
 294GENERATE_AMI_CT_16(ami_ct_u16le, AMI_CT_U16LE)
 295
 296
 297static TRANS transAmiga = {
 298        .ct_ulaw        = ami_ct_ulaw,
 299        .ct_alaw        = ami_ct_alaw,
 300        .ct_s8          = ami_ct_s8,
 301        .ct_u8          = ami_ct_u8,
 302        .ct_s16be       = ami_ct_s16be,
 303        .ct_u16be       = ami_ct_u16be,
 304        .ct_s16le       = ami_ct_s16le,
 305        .ct_u16le       = ami_ct_u16le,
 306};
 307
 308/*** Low level stuff *********************************************************/
 309
 310static inline void StopDMA(void)
 311{
 312        custom.aud[0].audvol = custom.aud[1].audvol = 0;
 313        custom.aud[2].audvol = custom.aud[3].audvol = 0;
 314        custom.dmacon = AMI_AUDIO_OFF;
 315        enable_heartbeat();
 316}
 317
 318static void *AmiAlloc(unsigned int size, gfp_t flags)
 319{
 320        return amiga_chip_alloc((long)size, "dmasound [Paula]");
 321}
 322
 323static void AmiFree(void *obj, unsigned int size)
 324{
 325        amiga_chip_free (obj);
 326}
 327
 328static int __init AmiIrqInit(void)
 329{
 330        /* turn off DMA for audio channels */
 331        StopDMA();
 332
 333        /* Register interrupt handler. */
 334        if (request_irq(IRQ_AMIGA_AUD0, AmiInterrupt, 0, "DMA sound",
 335                        AmiInterrupt))
 336                return 0;
 337        return 1;
 338}
 339
 340#ifdef MODULE
 341static void AmiIrqCleanUp(void)
 342{
 343        /* turn off DMA for audio channels */
 344        StopDMA();
 345        /* release the interrupt */
 346        free_irq(IRQ_AMIGA_AUD0, AmiInterrupt);
 347}
 348#endif /* MODULE */
 349
 350static void AmiSilence(void)
 351{
 352        /* turn off DMA for audio channels */
 353        StopDMA();
 354}
 355
 356
 357static void AmiInit(void)
 358{
 359        int period, i;
 360
 361        AmiSilence();
 362
 363        if (dmasound.soft.speed)
 364                period = amiga_colorclock/dmasound.soft.speed-1;
 365        else
 366                period = amiga_audio_min_period;
 367        dmasound.hard = dmasound.soft;
 368        dmasound.trans_write = &transAmiga;
 369
 370        if (period < amiga_audio_min_period) {
 371                /* we would need to squeeze the sound, but we won't do that */
 372                period = amiga_audio_min_period;
 373        } else if (period > 65535) {
 374                period = 65535;
 375        }
 376        dmasound.hard.speed = amiga_colorclock/(period+1);
 377
 378        for (i = 0; i < 4; i++)
 379                custom.aud[i].audper = period;
 380        amiga_audio_period = period;
 381}
 382
 383
 384static int AmiSetFormat(int format)
 385{
 386        int size;
 387
 388        /* Amiga sound DMA supports 8bit and 16bit (pseudo 14 bit) modes */
 389
 390        switch (format) {
 391        case AFMT_QUERY:
 392                return dmasound.soft.format;
 393        case AFMT_MU_LAW:
 394        case AFMT_A_LAW:
 395        case AFMT_U8:
 396        case AFMT_S8:
 397                size = 8;
 398                break;
 399        case AFMT_S16_BE:
 400        case AFMT_U16_BE:
 401        case AFMT_S16_LE:
 402        case AFMT_U16_LE:
 403                size = 16;
 404                break;
 405        default: /* :-) */
 406                size = 8;
 407                format = AFMT_S8;
 408        }
 409
 410        dmasound.soft.format = format;
 411        dmasound.soft.size = size;
 412        if (dmasound.minDev == SND_DEV_DSP) {
 413                dmasound.dsp.format = format;
 414                dmasound.dsp.size = dmasound.soft.size;
 415        }
 416        AmiInit();
 417
 418        return format;
 419}
 420
 421
 422#define VOLUME_VOXWARE_TO_AMI(v) \
 423        (((v) < 0) ? 0 : ((v) > 100) ? 64 : ((v) * 64)/100)
 424#define VOLUME_AMI_TO_VOXWARE(v) ((v)*100/64)
 425
 426static int AmiSetVolume(int volume)
 427{
 428        dmasound.volume_left = VOLUME_VOXWARE_TO_AMI(volume & 0xff);
 429        custom.aud[0].audvol = dmasound.volume_left;
 430        dmasound.volume_right = VOLUME_VOXWARE_TO_AMI((volume & 0xff00) >> 8);
 431        custom.aud[1].audvol = dmasound.volume_right;
 432        if (dmasound.hard.size == 16) {
 433                if (dmasound.volume_left == 64 && dmasound.volume_right == 64) {
 434                        custom.aud[2].audvol = 1;
 435                        custom.aud[3].audvol = 1;
 436                } else {
 437                        custom.aud[2].audvol = 0;
 438                        custom.aud[3].audvol = 0;
 439                }
 440        }
 441        return VOLUME_AMI_TO_VOXWARE(dmasound.volume_left) |
 442               (VOLUME_AMI_TO_VOXWARE(dmasound.volume_right) << 8);
 443}
 444
 445static int AmiSetTreble(int treble)
 446{
 447        dmasound.treble = treble;
 448        if (treble < 50)
 449                ciaa.pra &= ~0x02;
 450        else
 451                ciaa.pra |= 0x02;
 452        return treble;
 453}
 454
 455
 456#define AMI_PLAY_LOADED         1
 457#define AMI_PLAY_PLAYING        2
 458#define AMI_PLAY_MASK           3
 459
 460
 461static void AmiPlayNextFrame(int index)
 462{
 463        u_char *start, *ch0, *ch1, *ch2, *ch3;
 464        u_long size;
 465
 466        /* used by AmiPlay() if all doubts whether there really is something
 467         * to be played are already wiped out.
 468         */
 469        start = write_sq.buffers[write_sq.front];
 470        size = (write_sq.count == index ? write_sq.rear_size
 471                                        : write_sq.block_size)>>1;
 472
 473        if (dmasound.hard.stereo) {
 474                ch0 = start;
 475                ch1 = start+write_sq_block_size_half;
 476                size >>= 1;
 477        } else {
 478                ch0 = start;
 479                ch1 = start;
 480        }
 481
 482        disable_heartbeat();
 483        custom.aud[0].audvol = dmasound.volume_left;
 484        custom.aud[1].audvol = dmasound.volume_right;
 485        if (dmasound.hard.size == 8) {
 486                custom.aud[0].audlc = (u_short *)ZTWO_PADDR(ch0);
 487                custom.aud[0].audlen = size;
 488                custom.aud[1].audlc = (u_short *)ZTWO_PADDR(ch1);
 489                custom.aud[1].audlen = size;
 490                custom.dmacon = AMI_AUDIO_8;
 491        } else {
 492                size >>= 1;
 493                custom.aud[0].audlc = (u_short *)ZTWO_PADDR(ch0);
 494                custom.aud[0].audlen = size;
 495                custom.aud[1].audlc = (u_short *)ZTWO_PADDR(ch1);
 496                custom.aud[1].audlen = size;
 497                if (dmasound.volume_left == 64 && dmasound.volume_right == 64) {
 498                        /* We can play pseudo 14-bit only with the maximum volume */
 499                        ch3 = ch0+write_sq_block_size_quarter;
 500                        ch2 = ch1+write_sq_block_size_quarter;
 501                        custom.aud[2].audvol = 1;  /* we are being affected by the beeps */
 502                        custom.aud[3].audvol = 1;  /* restoring volume here helps a bit */
 503                        custom.aud[2].audlc = (u_short *)ZTWO_PADDR(ch2);
 504                        custom.aud[2].audlen = size;
 505                        custom.aud[3].audlc = (u_short *)ZTWO_PADDR(ch3);
 506                        custom.aud[3].audlen = size;
 507                        custom.dmacon = AMI_AUDIO_14;
 508                } else {
 509                        custom.aud[2].audvol = 0;
 510                        custom.aud[3].audvol = 0;
 511                        custom.dmacon = AMI_AUDIO_8;
 512                }
 513        }
 514        write_sq.front = (write_sq.front+1) % write_sq.max_count;
 515        write_sq.active |= AMI_PLAY_LOADED;
 516}
 517
 518
 519static void AmiPlay(void)
 520{
 521        int minframes = 1;
 522
 523        custom.intena = IF_AUD0;
 524
 525        if (write_sq.active & AMI_PLAY_LOADED) {
 526                /* There's already a frame loaded */
 527                custom.intena = IF_SETCLR | IF_AUD0;
 528                return;
 529        }
 530
 531        if (write_sq.active & AMI_PLAY_PLAYING)
 532                /* Increase threshold: frame 1 is already being played */
 533                minframes = 2;
 534
 535        if (write_sq.count < minframes) {
 536                /* Nothing to do */
 537                custom.intena = IF_SETCLR | IF_AUD0;
 538                return;
 539        }
 540
 541        if (write_sq.count <= minframes &&
 542            write_sq.rear_size < write_sq.block_size && !write_sq.syncing) {
 543                /* hmmm, the only existing frame is not
 544                 * yet filled and we're not syncing?
 545                 */
 546                custom.intena = IF_SETCLR | IF_AUD0;
 547                return;
 548        }
 549
 550        AmiPlayNextFrame(minframes);
 551
 552        custom.intena = IF_SETCLR | IF_AUD0;
 553}
 554
 555
 556static irqreturn_t AmiInterrupt(int irq, void *dummy)
 557{
 558        int minframes = 1;
 559
 560        custom.intena = IF_AUD0;
 561
 562        if (!write_sq.active) {
 563                /* Playing was interrupted and sq_reset() has already cleared
 564                 * the sq variables, so better don't do anything here.
 565                 */
 566                WAKE_UP(write_sq.sync_queue);
 567                return IRQ_HANDLED;
 568        }
 569
 570        if (write_sq.active & AMI_PLAY_PLAYING) {
 571                /* We've just finished a frame */
 572                write_sq.count--;
 573                WAKE_UP(write_sq.action_queue);
 574        }
 575
 576        if (write_sq.active & AMI_PLAY_LOADED)
 577                /* Increase threshold: frame 1 is already being played */
 578                minframes = 2;
 579
 580        /* Shift the flags */
 581        write_sq.active = (write_sq.active<<1) & AMI_PLAY_MASK;
 582
 583        if (!write_sq.active)
 584                /* No frame is playing, disable audio DMA */
 585                StopDMA();
 586
 587        custom.intena = IF_SETCLR | IF_AUD0;
 588
 589        if (write_sq.count >= minframes)
 590                /* Try to play the next frame */
 591                AmiPlay();
 592
 593        if (!write_sq.active)
 594                /* Nothing to play anymore.
 595                   Wake up a process waiting for audio output to drain. */
 596                WAKE_UP(write_sq.sync_queue);
 597        return IRQ_HANDLED;
 598}
 599
 600/*** Mid level stuff *********************************************************/
 601
 602
 603/*
 604 * /dev/mixer abstraction
 605 */
 606
 607static void __init AmiMixerInit(void)
 608{
 609        dmasound.volume_left = 64;
 610        dmasound.volume_right = 64;
 611        custom.aud[0].audvol = dmasound.volume_left;
 612        custom.aud[3].audvol = 1;       /* For pseudo 14bit */
 613        custom.aud[1].audvol = dmasound.volume_right;
 614        custom.aud[2].audvol = 1;       /* For pseudo 14bit */
 615        dmasound.treble = 50;
 616}
 617
 618static int AmiMixerIoctl(u_int cmd, u_long arg)
 619{
 620        int data;
 621        switch (cmd) {
 622            case SOUND_MIXER_READ_DEVMASK:
 623                    return IOCTL_OUT(arg, SOUND_MASK_VOLUME | SOUND_MASK_TREBLE);
 624            case SOUND_MIXER_READ_RECMASK:
 625                    return IOCTL_OUT(arg, 0);
 626            case SOUND_MIXER_READ_STEREODEVS:
 627                    return IOCTL_OUT(arg, SOUND_MASK_VOLUME);
 628            case SOUND_MIXER_READ_VOLUME:
 629                    return IOCTL_OUT(arg,
 630                            VOLUME_AMI_TO_VOXWARE(dmasound.volume_left) |
 631                            VOLUME_AMI_TO_VOXWARE(dmasound.volume_right) << 8);
 632            case SOUND_MIXER_WRITE_VOLUME:
 633                    IOCTL_IN(arg, data);
 634                    return IOCTL_OUT(arg, dmasound_set_volume(data));
 635            case SOUND_MIXER_READ_TREBLE:
 636                    return IOCTL_OUT(arg, dmasound.treble);
 637            case SOUND_MIXER_WRITE_TREBLE:
 638                    IOCTL_IN(arg, data);
 639                    return IOCTL_OUT(arg, dmasound_set_treble(data));
 640        }
 641        return -EINVAL;
 642}
 643
 644
 645static int AmiWriteSqSetup(void)
 646{
 647        write_sq_block_size_half = write_sq.block_size>>1;
 648        write_sq_block_size_quarter = write_sq_block_size_half>>1;
 649        return 0;
 650}
 651
 652
 653static int AmiStateInfo(char *buffer, size_t space)
 654{
 655        int len = 0;
 656        len += sprintf(buffer+len, "\tsound.volume_left = %d [0...64]\n",
 657                       dmasound.volume_left);
 658        len += sprintf(buffer+len, "\tsound.volume_right = %d [0...64]\n",
 659                       dmasound.volume_right);
 660        if (len >= space) {
 661                printk(KERN_ERR "dmasound_paula: overflowed state buffer alloc.\n") ;
 662                len = space ;
 663        }
 664        return len;
 665}
 666
 667
 668/*** Machine definitions *****************************************************/
 669
 670static SETTINGS def_hard = {
 671        .format = AFMT_S8,
 672        .stereo = 0,
 673        .size   = 8,
 674        .speed  = 8000
 675} ;
 676
 677static SETTINGS def_soft = {
 678        .format = AFMT_U8,
 679        .stereo = 0,
 680        .size   = 8,
 681        .speed  = 8000
 682} ;
 683
 684static MACHINE machAmiga = {
 685        .name           = "Amiga",
 686        .name2          = "AMIGA",
 687        .owner          = THIS_MODULE,
 688        .dma_alloc      = AmiAlloc,
 689        .dma_free       = AmiFree,
 690        .irqinit        = AmiIrqInit,
 691#ifdef MODULE
 692        .irqcleanup     = AmiIrqCleanUp,
 693#endif /* MODULE */
 694        .init           = AmiInit,
 695        .silence        = AmiSilence,
 696        .setFormat      = AmiSetFormat,
 697        .setVolume      = AmiSetVolume,
 698        .setTreble      = AmiSetTreble,
 699        .play           = AmiPlay,
 700        .mixer_init     = AmiMixerInit,
 701        .mixer_ioctl    = AmiMixerIoctl,
 702        .write_sq_setup = AmiWriteSqSetup,
 703        .state_info     = AmiStateInfo,
 704        .min_dsp_speed  = 8000,
 705        .version        = ((DMASOUND_PAULA_REVISION<<8) | DMASOUND_PAULA_EDITION),
 706        .hardware_afmts = (AFMT_S8 | AFMT_S16_BE), /* h'ware-supported formats *only* here */
 707        .capabilities   = DSP_CAP_BATCH          /* As per SNDCTL_DSP_GETCAPS */
 708};
 709
 710
 711/*** Config & Setup **********************************************************/
 712
 713
 714static int __init amiga_audio_probe(struct platform_device *pdev)
 715{
 716        dmasound.mach = machAmiga;
 717        dmasound.mach.default_hard = def_hard ;
 718        dmasound.mach.default_soft = def_soft ;
 719        return dmasound_init();
 720}
 721
 722static int __exit amiga_audio_remove(struct platform_device *pdev)
 723{
 724        dmasound_deinit();
 725        return 0;
 726}
 727
 728static struct platform_driver amiga_audio_driver = {
 729        .remove = __exit_p(amiga_audio_remove),
 730        .driver   = {
 731                .name   = "amiga-audio",
 732                .owner  = THIS_MODULE,
 733        },
 734};
 735
 736static int __init amiga_audio_init(void)
 737{
 738        return platform_driver_probe(&amiga_audio_driver, amiga_audio_probe);
 739}
 740
 741module_init(amiga_audio_init);
 742
 743static void __exit amiga_audio_exit(void)
 744{
 745        platform_driver_unregister(&amiga_audio_driver);
 746}
 747
 748module_exit(amiga_audio_exit);
 749
 750MODULE_LICENSE("GPL");
 751MODULE_ALIAS("platform:amiga-audio");
 752