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dmasound_atari.c

/*
 *  linux/sound/oss/dmasound/dmasound_atari.c
 *
 *  Atari TT and Falcon DMA Sound Driver
 *
 *  See linux/sound/oss/dmasound/dmasound_core.c for copyright and credits
 *  prior to 28/01/2001
 *
 *  28/01/2001 [0.1] Iain Sandoe
 *               - added versioning
 *               - put in and populated the hardware_afmts field.
 *             [0.2] - put in SNDCTL_DSP_GETCAPS value.
 *  01/02/2001 [0.3] - put in default hard/soft settings.
 */


#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/soundcard.h>
#include <linux/mm.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>

#include <asm/uaccess.h>
#include <asm/atariints.h>
#include <asm/atari_stram.h>

#include "dmasound.h"

#define DMASOUND_ATARI_REVISION 0
#define DMASOUND_ATARI_EDITION 3

extern void atari_microwire_cmd(int cmd);

static int is_falcon;
static int write_sq_ignore_int;     /* ++TeSche: used for Falcon */

static int expand_bal;  /* Balance factor for expanding (not volume!) */
static int expand_data; /* Data for expanding */


/*** Translations ************************************************************/


/* ++TeSche: radically changed for new expanding purposes...
 *
 * These two routines now deal with copying/expanding/translating the samples
 * from user space into our buffer at the right frequency. They take care about
 * how much data there's actually to read, how much buffer space there is and
 * to convert samples into the right frequency/encoding. They will only work on
 * complete samples so it may happen they leave some bytes in the input stream
 * if the user didn't write a multiple of the current sample size. They both
 * return the number of bytes they've used from both streams so you may detect
 * such a situation. Luckily all programs should be able to cope with that.
 *
 * I think I've optimized anything as far as one can do in plain C, all
 * variables should fit in registers and the loops are really short. There's
 * one loop for every possible situation. Writing a more generalized and thus
 * parameterized loop would only produce slower code. Feel free to optimize
 * this in assembler if you like. :)
 *
 * I think these routines belong here because they're not yet really hardware
 * independent, especially the fact that the Falcon can play 16bit samples
 * only in stereo is hardcoded in both of them!
 *
 * ++geert: split in even more functions (one per format)
 */

static ssize_t ata_ct_law(const u_char __user *userPtr, size_t userCount,
                    u_char frame[], ssize_t *frameUsed,
                    ssize_t frameLeft);
static ssize_t ata_ct_s8(const u_char __user *userPtr, size_t userCount,
                   u_char frame[], ssize_t *frameUsed,
                   ssize_t frameLeft);
static ssize_t ata_ct_u8(const u_char __user *userPtr, size_t userCount,
                   u_char frame[], ssize_t *frameUsed,
                   ssize_t frameLeft);
static ssize_t ata_ct_s16be(const u_char __user *userPtr, size_t userCount,
                      u_char frame[], ssize_t *frameUsed,
                      ssize_t frameLeft);
static ssize_t ata_ct_u16be(const u_char __user *userPtr, size_t userCount,
                      u_char frame[], ssize_t *frameUsed,
                      ssize_t frameLeft);
static ssize_t ata_ct_s16le(const u_char __user *userPtr, size_t userCount,
                      u_char frame[], ssize_t *frameUsed,
                      ssize_t frameLeft);
static ssize_t ata_ct_u16le(const u_char __user *userPtr, size_t userCount,
                      u_char frame[], ssize_t *frameUsed,
                      ssize_t frameLeft);
static ssize_t ata_ctx_law(const u_char __user *userPtr, size_t userCount,
                     u_char frame[], ssize_t *frameUsed,
                     ssize_t frameLeft);
static ssize_t ata_ctx_s8(const u_char __user *userPtr, size_t userCount,
                    u_char frame[], ssize_t *frameUsed,
                    ssize_t frameLeft);
static ssize_t ata_ctx_u8(const u_char __user *userPtr, size_t userCount,
                    u_char frame[], ssize_t *frameUsed,
                    ssize_t frameLeft);
static ssize_t ata_ctx_s16be(const u_char __user *userPtr, size_t userCount,
                       u_char frame[], ssize_t *frameUsed,
                       ssize_t frameLeft);
static ssize_t ata_ctx_u16be(const u_char __user *userPtr, size_t userCount,
                       u_char frame[], ssize_t *frameUsed,
                       ssize_t frameLeft);
static ssize_t ata_ctx_s16le(const u_char __user *userPtr, size_t userCount,
                       u_char frame[], ssize_t *frameUsed,
                       ssize_t frameLeft);
static ssize_t ata_ctx_u16le(const u_char __user *userPtr, size_t userCount,
                       u_char frame[], ssize_t *frameUsed,
                       ssize_t frameLeft);


/*** Low level stuff *********************************************************/


static void *AtaAlloc(unsigned int size, gfp_t flags);
static void AtaFree(void *, unsigned int size);
static int AtaIrqInit(void);
#ifdef MODULE
static void AtaIrqCleanUp(void);
#endif /* MODULE */
static int AtaSetBass(int bass);
static int AtaSetTreble(int treble);
static void TTSilence(void);
static void TTInit(void);
static int TTSetFormat(int format);
static int TTSetVolume(int volume);
static int TTSetGain(int gain);
static void FalconSilence(void);
static void FalconInit(void);
static int FalconSetFormat(int format);
static int FalconSetVolume(int volume);
static void AtaPlayNextFrame(int index);
static void AtaPlay(void);
static irqreturn_t AtaInterrupt(int irq, void *dummy);

/*** Mid level stuff *********************************************************/

static void TTMixerInit(void);
static void FalconMixerInit(void);
static int AtaMixerIoctl(u_int cmd, u_long arg);
static int TTMixerIoctl(u_int cmd, u_long arg);
static int FalconMixerIoctl(u_int cmd, u_long arg);
static int AtaWriteSqSetup(void);
static int AtaSqOpen(mode_t mode);
static int TTStateInfo(char *buffer, size_t space);
static int FalconStateInfo(char *buffer, size_t space);


/*** Translations ************************************************************/


static ssize_t ata_ct_law(const u_char __user *userPtr, size_t userCount,
                    u_char frame[], ssize_t *frameUsed,
                    ssize_t frameLeft)
{
      char *table = dmasound.soft.format == AFMT_MU_LAW ? dmasound_ulaw2dma8
                                            : dmasound_alaw2dma8;
      ssize_t count, used;
      u_char *p = &frame[*frameUsed];

      count = min_t(unsigned long, userCount, frameLeft);
      if (dmasound.soft.stereo)
            count &= ~1;
      used = count;
      while (count > 0) {
            u_char data;
            if (get_user(data, userPtr++))
                  return -EFAULT;
            *p++ = table[data];
            count--;
      }
      *frameUsed += used;
      return used;
}


static ssize_t ata_ct_s8(const u_char __user *userPtr, size_t userCount,
                   u_char frame[], ssize_t *frameUsed,
                   ssize_t frameLeft)
{
      ssize_t count, used;
      void *p = &frame[*frameUsed];

      count = min_t(unsigned long, userCount, frameLeft);
      if (dmasound.soft.stereo)
            count &= ~1;
      used = count;
      if (copy_from_user(p, userPtr, count))
            return -EFAULT;
      *frameUsed += used;
      return used;
}


static ssize_t ata_ct_u8(const u_char __user *userPtr, size_t userCount,
                   u_char frame[], ssize_t *frameUsed,
                   ssize_t frameLeft)
{
      ssize_t count, used;

      if (!dmasound.soft.stereo) {
            u_char *p = &frame[*frameUsed];
            count = min_t(unsigned long, userCount, frameLeft);
            used = count;
            while (count > 0) {
                  u_char data;
                  if (get_user(data, userPtr++))
                        return -EFAULT;
                  *p++ = data ^ 0x80;
                  count--;
            }
      } else {
            u_short *p = (u_short *)&frame[*frameUsed];
            count = min_t(unsigned long, userCount, frameLeft)>>1;
            used = count*2;
            while (count > 0) {
                  u_short data;
                  if (get_user(data, (u_short __user *)userPtr))
                        return -EFAULT;
                  userPtr += 2;
                  *p++ = data ^ 0x8080;
                  count--;
            }
      }
      *frameUsed += used;
      return used;
}


static ssize_t ata_ct_s16be(const u_char __user *userPtr, size_t userCount,
                      u_char frame[], ssize_t *frameUsed,
                      ssize_t frameLeft)
{
      ssize_t count, used;

      if (!dmasound.soft.stereo) {
            u_short *p = (u_short *)&frame[*frameUsed];
            count = min_t(unsigned long, userCount, frameLeft)>>1;
            used = count*2;
            while (count > 0) {
                  u_short data;
                  if (get_user(data, (u_short __user *)userPtr))
                        return -EFAULT;
                  userPtr += 2;
                  *p++ = data;
                  *p++ = data;
                  count--;
            }
            *frameUsed += used*2;
      } else {
            void *p = (u_short *)&frame[*frameUsed];
            count = min_t(unsigned long, userCount, frameLeft) & ~3;
            used = count;
            if (copy_from_user(p, userPtr, count))
                  return -EFAULT;
            *frameUsed += used;
      }
      return used;
}


static ssize_t ata_ct_u16be(const u_char __user *userPtr, size_t userCount,
                      u_char frame[], ssize_t *frameUsed,
                      ssize_t frameLeft)
{
      ssize_t count, used;

      if (!dmasound.soft.stereo) {
            u_short *p = (u_short *)&frame[*frameUsed];
            count = min_t(unsigned long, userCount, frameLeft)>>1;
            used = count*2;
            while (count > 0) {
                  u_short data;
                  if (get_user(data, (u_short __user *)userPtr))
                        return -EFAULT;
                  userPtr += 2;
                  data ^= 0x8000;
                  *p++ = data;
                  *p++ = data;
                  count--;
            }
            *frameUsed += used*2;
      } else {
            u_long *p = (u_long *)&frame[*frameUsed];
            count = min_t(unsigned long, userCount, frameLeft)>>2;
            used = count*4;
            while (count > 0) {
                  u_int data;
                  if (get_user(data, (u_int __user *)userPtr))
                        return -EFAULT;
                  userPtr += 4;
                  *p++ = data ^ 0x80008000;
                  count--;
            }
            *frameUsed += used;
      }
      return used;
}


static ssize_t ata_ct_s16le(const u_char __user *userPtr, size_t userCount,
                      u_char frame[], ssize_t *frameUsed,
                      ssize_t frameLeft)
{
      ssize_t count, used;

      count = frameLeft;
      if (!dmasound.soft.stereo) {
            u_short *p = (u_short *)&frame[*frameUsed];
            count = min_t(unsigned long, userCount, frameLeft)>>1;
            used = count*2;
            while (count > 0) {
                  u_short data;
                  if (get_user(data, (u_short __user *)userPtr))
                        return -EFAULT;
                  userPtr += 2;
                  data = le2be16(data);
                  *p++ = data;
                  *p++ = data;
                  count--;
            }
            *frameUsed += used*2;
      } else {
            u_long *p = (u_long *)&frame[*frameUsed];
            count = min_t(unsigned long, userCount, frameLeft)>>2;
            used = count*4;
            while (count > 0) {
                  u_long data;
                  if (get_user(data, (u_int __user *)userPtr))
                        return -EFAULT;
                  userPtr += 4;
                  data = le2be16dbl(data);
                  *p++ = data;
                  count--;
            }
            *frameUsed += used;
      }
      return used;
}


static ssize_t ata_ct_u16le(const u_char __user *userPtr, size_t userCount,
                      u_char frame[], ssize_t *frameUsed,
                      ssize_t frameLeft)
{
      ssize_t count, used;

      count = frameLeft;
      if (!dmasound.soft.stereo) {
            u_short *p = (u_short *)&frame[*frameUsed];
            count = min_t(unsigned long, userCount, frameLeft)>>1;
            used = count*2;
            while (count > 0) {
                  u_short data;
                  if (get_user(data, (u_short __user *)userPtr))
                        return -EFAULT;
                  userPtr += 2;
                  data = le2be16(data) ^ 0x8000;
                  *p++ = data;
                  *p++ = data;
            }
            *frameUsed += used*2;
      } else {
            u_long *p = (u_long *)&frame[*frameUsed];
            count = min_t(unsigned long, userCount, frameLeft)>>2;
            used = count;
            while (count > 0) {
                  u_long data;
                  if (get_user(data, (u_int __user *)userPtr))
                        return -EFAULT;
                  userPtr += 4;
                  data = le2be16dbl(data) ^ 0x80008000;
                  *p++ = data;
                  count--;
            }
            *frameUsed += used;
      }
      return used;
}


static ssize_t ata_ctx_law(const u_char __user *userPtr, size_t userCount,
                     u_char frame[], ssize_t *frameUsed,
                     ssize_t frameLeft)
{
      char *table = dmasound.soft.format == AFMT_MU_LAW ? dmasound_ulaw2dma8
                                            : dmasound_alaw2dma8;
      /* this should help gcc to stuff everything into registers */
      long bal = expand_bal;
      long hSpeed = dmasound.hard.speed, sSpeed = dmasound.soft.speed;
      ssize_t used, usedf;

      used = userCount;
      usedf = frameLeft;
      if (!dmasound.soft.stereo) {
            u_char *p = &frame[*frameUsed];
            u_char data = expand_data;
            while (frameLeft) {
                  u_char c;
                  if (bal < 0) {
                        if (!userCount)
                              break;
                        if (get_user(c, userPtr++))
                              return -EFAULT;
                        data = table[c];
                        userCount--;
                        bal += hSpeed;
                  }
                  *p++ = data;
                  frameLeft--;
                  bal -= sSpeed;
            }
            expand_data = data;
      } else {
            u_short *p = (u_short *)&frame[*frameUsed];
            u_short data = expand_data;
            while (frameLeft >= 2) {
                  u_char c;
                  if (bal < 0) {
                        if (userCount < 2)
                              break;
                        if (get_user(c, userPtr++))
                              return -EFAULT;
                        data = table[c] << 8;
                        if (get_user(c, userPtr++))
                              return -EFAULT;
                        data |= table[c];
                        userCount -= 2;
                        bal += hSpeed;
                  }
                  *p++ = data;
                  frameLeft -= 2;
                  bal -= sSpeed;
            }
            expand_data = data;
      }
      expand_bal = bal;
      used -= userCount;
      *frameUsed += usedf-frameLeft;
      return used;
}


static ssize_t ata_ctx_s8(const u_char __user *userPtr, size_t userCount,
                    u_char frame[], ssize_t *frameUsed,
                    ssize_t frameLeft)
{
      /* this should help gcc to stuff everything into registers */
      long bal = expand_bal;
      long hSpeed = dmasound.hard.speed, sSpeed = dmasound.soft.speed;
      ssize_t used, usedf;

      used = userCount;
      usedf = frameLeft;
      if (!dmasound.soft.stereo) {
            u_char *p = &frame[*frameUsed];
            u_char data = expand_data;
            while (frameLeft) {
                  if (bal < 0) {
                        if (!userCount)
                              break;
                        if (get_user(data, userPtr++))
                              return -EFAULT;
                        userCount--;
                        bal += hSpeed;
                  }
                  *p++ = data;
                  frameLeft--;
                  bal -= sSpeed;
            }
            expand_data = data;
      } else {
            u_short *p = (u_short *)&frame[*frameUsed];
            u_short data = expand_data;
            while (frameLeft >= 2) {
                  if (bal < 0) {
                        if (userCount < 2)
                              break;
                        if (get_user(data, (u_short __user *)userPtr))
                              return -EFAULT;
                        userPtr += 2;
                        userCount -= 2;
                        bal += hSpeed;
                  }
                  *p++ = data;
                  frameLeft -= 2;
                  bal -= sSpeed;
            }
            expand_data = data;
      }
      expand_bal = bal;
      used -= userCount;
      *frameUsed += usedf-frameLeft;
      return used;
}


static ssize_t ata_ctx_u8(const u_char __user *userPtr, size_t userCount,
                    u_char frame[], ssize_t *frameUsed,
                    ssize_t frameLeft)
{
      /* this should help gcc to stuff everything into registers */
      long bal = expand_bal;
      long hSpeed = dmasound.hard.speed, sSpeed = dmasound.soft.speed;
      ssize_t used, usedf;

      used = userCount;
      usedf = frameLeft;
      if (!dmasound.soft.stereo) {
            u_char *p = &frame[*frameUsed];
            u_char data = expand_data;
            while (frameLeft) {
                  if (bal < 0) {
                        if (!userCount)
                              break;
                        if (get_user(data, userPtr++))
                              return -EFAULT;
                        data ^= 0x80;
                        userCount--;
                        bal += hSpeed;
                  }
                  *p++ = data;
                  frameLeft--;
                  bal -= sSpeed;
            }
            expand_data = data;
      } else {
            u_short *p = (u_short *)&frame[*frameUsed];
            u_short data = expand_data;
            while (frameLeft >= 2) {
                  if (bal < 0) {
                        if (userCount < 2)
                              break;
                        if (get_user(data, (u_short __user *)userPtr))
                              return -EFAULT;
                        userPtr += 2;
                        data ^= 0x8080;
                        userCount -= 2;
                        bal += hSpeed;
                  }
                  *p++ = data;
                  frameLeft -= 2;
                  bal -= sSpeed;
            }
            expand_data = data;
      }
      expand_bal = bal;
      used -= userCount;
      *frameUsed += usedf-frameLeft;
      return used;
}


static ssize_t ata_ctx_s16be(const u_char __user *userPtr, size_t userCount,
                       u_char frame[], ssize_t *frameUsed,
                       ssize_t frameLeft)
{
      /* this should help gcc to stuff everything into registers */
      long bal = expand_bal;
      long hSpeed = dmasound.hard.speed, sSpeed = dmasound.soft.speed;
      ssize_t used, usedf;

      used = userCount;
      usedf = frameLeft;
      if (!dmasound.soft.stereo) {
            u_short *p = (u_short *)&frame[*frameUsed];
            u_short data = expand_data;
            while (frameLeft >= 4) {
                  if (bal < 0) {
                        if (userCount < 2)
                              break;
                        if (get_user(data, (u_short __user *)userPtr))
                              return -EFAULT;
                        userPtr += 2;
                        userCount -= 2;
                        bal += hSpeed;
                  }
                  *p++ = data;
                  *p++ = data;
                  frameLeft -= 4;
                  bal -= sSpeed;
            }
            expand_data = data;
      } else {
            u_long *p = (u_long *)&frame[*frameUsed];
            u_long data = expand_data;
            while (frameLeft >= 4) {
                  if (bal < 0) {
                        if (userCount < 4)
                              break;
                        if (get_user(data, (u_int __user *)userPtr))
                              return -EFAULT;
                        userPtr += 4;
                        userCount -= 4;
                        bal += hSpeed;
                  }
                  *p++ = data;
                  frameLeft -= 4;
                  bal -= sSpeed;
            }
            expand_data = data;
      }
      expand_bal = bal;
      used -= userCount;
      *frameUsed += usedf-frameLeft;
      return used;
}


static ssize_t ata_ctx_u16be(const u_char __user *userPtr, size_t userCount,
                       u_char frame[], ssize_t *frameUsed,
                       ssize_t frameLeft)
{
      /* this should help gcc to stuff everything into registers */
      long bal = expand_bal;
      long hSpeed = dmasound.hard.speed, sSpeed = dmasound.soft.speed;
      ssize_t used, usedf;

      used = userCount;
      usedf = frameLeft;
      if (!dmasound.soft.stereo) {
            u_short *p = (u_short *)&frame[*frameUsed];
            u_short data = expand_data;
            while (frameLeft >= 4) {
                  if (bal < 0) {
                        if (userCount < 2)
                              break;
                        if (get_user(data, (u_short __user *)userPtr))
                              return -EFAULT;
                        userPtr += 2;
                        data ^= 0x8000;
                        userCount -= 2;
                        bal += hSpeed;
                  }
                  *p++ = data;
                  *p++ = data;
                  frameLeft -= 4;
                  bal -= sSpeed;
            }
            expand_data = data;
      } else {
            u_long *p = (u_long *)&frame[*frameUsed];
            u_long data = expand_data;
            while (frameLeft >= 4) {
                  if (bal < 0) {
                        if (userCount < 4)
                              break;
                        if (get_user(data, (u_int __user *)userPtr))
                              return -EFAULT;
                        userPtr += 4;
                        data ^= 0x80008000;
                        userCount -= 4;
                        bal += hSpeed;
                  }
                  *p++ = data;
                  frameLeft -= 4;
                  bal -= sSpeed;
            }
            expand_data = data;
      }
      expand_bal = bal;
      used -= userCount;
      *frameUsed += usedf-frameLeft;
      return used;
}


static ssize_t ata_ctx_s16le(const u_char __user *userPtr, size_t userCount,
                       u_char frame[], ssize_t *frameUsed,
                       ssize_t frameLeft)
{
      /* this should help gcc to stuff everything into registers */
      long bal = expand_bal;
      long hSpeed = dmasound.hard.speed, sSpeed = dmasound.soft.speed;
      ssize_t used, usedf;

      used = userCount;
      usedf = frameLeft;
      if (!dmasound.soft.stereo) {
            u_short *p = (u_short *)&frame[*frameUsed];
            u_short data = expand_data;
            while (frameLeft >= 4) {
                  if (bal < 0) {
                        if (userCount < 2)
                              break;
                        if (get_user(data, (u_short __user *)userPtr))
                              return -EFAULT;
                        userPtr += 2;
                        data = le2be16(data);
                        userCount -= 2;
                        bal += hSpeed;
                  }
                  *p++ = data;
                  *p++ = data;
                  frameLeft -= 4;
                  bal -= sSpeed;
            }
            expand_data = data;
      } else {
            u_long *p = (u_long *)&frame[*frameUsed];
            u_long data = expand_data;
            while (frameLeft >= 4) {
                  if (bal < 0) {
                        if (userCount < 4)
                              break;
                        if (get_user(data, (u_int __user *)userPtr))
                              return -EFAULT;
                        userPtr += 4;
                        data = le2be16dbl(data);
                        userCount -= 4;
                        bal += hSpeed;
                  }
                  *p++ = data;
                  frameLeft -= 4;
                  bal -= sSpeed;
            }
            expand_data = data;
      }
      expand_bal = bal;
      used -= userCount;
      *frameUsed += usedf-frameLeft;
      return used;
}


static ssize_t ata_ctx_u16le(const u_char __user *userPtr, size_t userCount,
                       u_char frame[], ssize_t *frameUsed,
                       ssize_t frameLeft)
{
      /* this should help gcc to stuff everything into registers */
      long bal = expand_bal;
      long hSpeed = dmasound.hard.speed, sSpeed = dmasound.soft.speed;
      ssize_t used, usedf;

      used = userCount;
      usedf = frameLeft;
      if (!dmasound.soft.stereo) {
            u_short *p = (u_short *)&frame[*frameUsed];
            u_short data = expand_data;
            while (frameLeft >= 4) {
                  if (bal < 0) {
                        if (userCount < 2)
                              break;
                        if (get_user(data, (u_short __user *)userPtr))
                              return -EFAULT;
                        userPtr += 2;
                        data = le2be16(data) ^ 0x8000;
                        userCount -= 2;
                        bal += hSpeed;
                  }
                  *p++ = data;
                  *p++ = data;
                  frameLeft -= 4;
                  bal -= sSpeed;
            }
            expand_data = data;
      } else {
            u_long *p = (u_long *)&frame[*frameUsed];
            u_long data = expand_data;
            while (frameLeft >= 4) {
                  if (bal < 0) {
                        if (userCount < 4)
                              break;
                        if (get_user(data, (u_int __user *)userPtr))
                              return -EFAULT;
                        userPtr += 4;
                        data = le2be16dbl(data) ^ 0x80008000;
                        userCount -= 4;
                        bal += hSpeed;
                  }
                  *p++ = data;
                  frameLeft -= 4;
                  bal -= sSpeed;
            }
            expand_data = data;
      }
      expand_bal = bal;
      used -= userCount;
      *frameUsed += usedf-frameLeft;
      return used;
}


static TRANS transTTNormal = {
      .ct_ulaw    = ata_ct_law,
      .ct_alaw    = ata_ct_law,
      .ct_s8            = ata_ct_s8,
      .ct_u8            = ata_ct_u8,
};

static TRANS transTTExpanding = {
      .ct_ulaw    = ata_ctx_law,
      .ct_alaw    = ata_ctx_law,
      .ct_s8            = ata_ctx_s8,
      .ct_u8            = ata_ctx_u8,
};

static TRANS transFalconNormal = {
      .ct_ulaw    = ata_ct_law,
      .ct_alaw    = ata_ct_law,
      .ct_s8            = ata_ct_s8,
      .ct_u8            = ata_ct_u8,
      .ct_s16be   = ata_ct_s16be,
      .ct_u16be   = ata_ct_u16be,
      .ct_s16le   = ata_ct_s16le,
      .ct_u16le   = ata_ct_u16le
};

static TRANS transFalconExpanding = {
      .ct_ulaw    = ata_ctx_law,
      .ct_alaw    = ata_ctx_law,
      .ct_s8            = ata_ctx_s8,
      .ct_u8            = ata_ctx_u8,
      .ct_s16be   = ata_ctx_s16be,
      .ct_u16be   = ata_ctx_u16be,
      .ct_s16le   = ata_ctx_s16le,
      .ct_u16le   = ata_ctx_u16le,
};


/*** Low level stuff *********************************************************/



/*
 * Atari (TT/Falcon)
 */

static void *AtaAlloc(unsigned int size, gfp_t flags)
{
      return atari_stram_alloc(size, "dmasound");
}

static void AtaFree(void *obj, unsigned int size)
{
      atari_stram_free( obj );
}

static int __init AtaIrqInit(void)
{
      /* Set up timer A. Timer A
         will receive a signal upon end of playing from the sound
         hardware. Furthermore Timer A is able to count events
         and will cause an interrupt after a programmed number
         of events. So all we need to keep the music playing is
         to provide the sound hardware with new data upon
         an interrupt from timer A. */
      mfp.tim_ct_a = 0; /* ++roman: Stop timer before programming! */
      mfp.tim_dt_a = 1; /* Cause interrupt after first event. */
      mfp.tim_ct_a = 8; /* Turn on event counting. */
      /* Register interrupt handler. */
      request_irq(IRQ_MFP_TIMA, AtaInterrupt, IRQ_TYPE_SLOW, "DMA sound",
                AtaInterrupt);
      mfp.int_en_a |= 0x20;   /* Turn interrupt on. */
      mfp.int_mk_a |= 0x20;
      return 1;
}

#ifdef MODULE
static void AtaIrqCleanUp(void)
{
      mfp.tim_ct_a = 0; /* stop timer */
      mfp.int_en_a &= ~0x20;  /* turn interrupt off */
      free_irq(IRQ_MFP_TIMA, AtaInterrupt);
}
#endif /* MODULE */


#define TONE_VOXWARE_TO_DB(v) \
      (((v) < 0) ? -12 : ((v) > 100) ? 12 : ((v) - 50) * 6 / 25)
#define TONE_DB_TO_VOXWARE(v) (((v) * 25 + ((v) > 0 ? 5 : -5)) / 6 + 50)


static int AtaSetBass(int bass)
{
      dmasound.bass = TONE_VOXWARE_TO_DB(bass);
      atari_microwire_cmd(MW_LM1992_BASS(dmasound.bass));
      return TONE_DB_TO_VOXWARE(dmasound.bass);
}


static int AtaSetTreble(int treble)
{
      dmasound.treble = TONE_VOXWARE_TO_DB(treble);
      atari_microwire_cmd(MW_LM1992_TREBLE(dmasound.treble));
      return TONE_DB_TO_VOXWARE(dmasound.treble);
}



/*
 * TT
 */


static void TTSilence(void)
{
      tt_dmasnd.ctrl = DMASND_CTRL_OFF;
      atari_microwire_cmd(MW_LM1992_PSG_HIGH); /* mix in PSG signal 1:1 */
}


static void TTInit(void)
{
      int mode, i, idx;
      const int freq[4] = {50066, 25033, 12517, 6258};

      /* search a frequency that fits into the allowed error range */

      idx = -1;
      for (i = 0; i < ARRAY_SIZE(freq); i++)
            /* this isn't as much useful for a TT than for a Falcon, but
             * then it doesn't hurt very much to implement it for a TT too.
             */
            if ((100 * abs(dmasound.soft.speed - freq[i]) / freq[i]) < catchRadius)
                  idx = i;
      if (idx > -1) {
            dmasound.soft.speed = freq[idx];
            dmasound.trans_write = &transTTNormal;
      } else
            dmasound.trans_write = &transTTExpanding;

      TTSilence();
      dmasound.hard = dmasound.soft;

      if (dmasound.hard.speed > 50066) {
            /* we would need to squeeze the sound, but we won't do that */
            dmasound.hard.speed = 50066;
            mode = DMASND_MODE_50KHZ;
            dmasound.trans_write = &transTTNormal;
      } else if (dmasound.hard.speed > 25033) {
            dmasound.hard.speed = 50066;
            mode = DMASND_MODE_50KHZ;
      } else if (dmasound.hard.speed > 12517) {
            dmasound.hard.speed = 25033;
            mode = DMASND_MODE_25KHZ;
      } else if (dmasound.hard.speed > 6258) {
            dmasound.hard.speed = 12517;
            mode = DMASND_MODE_12KHZ;
      } else {
            dmasound.hard.speed = 6258;
            mode = DMASND_MODE_6KHZ;
      }

      tt_dmasnd.mode = (dmasound.hard.stereo ?
                    DMASND_MODE_STEREO : DMASND_MODE_MONO) |
            DMASND_MODE_8BIT | mode;

      expand_bal = -dmasound.soft.speed;
}


static int TTSetFormat(int format)
{
      /* TT sound DMA supports only 8bit modes */

      switch (format) {
      case AFMT_QUERY:
            return dmasound.soft.format;
      case AFMT_MU_LAW:
      case AFMT_A_LAW:
      case AFMT_S8:
      case AFMT_U8:
            break;
      default:
            format = AFMT_S8;
      }

      dmasound.soft.format = format;
      dmasound.soft.size = 8;
      if (dmasound.minDev == SND_DEV_DSP) {
            dmasound.dsp.format = format;
            dmasound.dsp.size = 8;
      }
      TTInit();

      return format;
}


#define VOLUME_VOXWARE_TO_DB(v) \
      (((v) < 0) ? -40 : ((v) > 100) ? 0 : ((v) * 2) / 5 - 40)
#define VOLUME_DB_TO_VOXWARE(v) ((((v) + 40) * 5 + 1) / 2)


static int TTSetVolume(int volume)
{
      dmasound.volume_left = VOLUME_VOXWARE_TO_DB(volume & 0xff);
      atari_microwire_cmd(MW_LM1992_BALLEFT(dmasound.volume_left));
      dmasound.volume_right = VOLUME_VOXWARE_TO_DB((volume & 0xff00) >> 8);
      atari_microwire_cmd(MW_LM1992_BALRIGHT(dmasound.volume_right));
      return VOLUME_DB_TO_VOXWARE(dmasound.volume_left) |
             (VOLUME_DB_TO_VOXWARE(dmasound.volume_right) << 8);
}


#define GAIN_VOXWARE_TO_DB(v) \
      (((v) < 0) ? -80 : ((v) > 100) ? 0 : ((v) * 4) / 5 - 80)
#define GAIN_DB_TO_VOXWARE(v) ((((v) + 80) * 5 + 1) / 4)

static int TTSetGain(int gain)
{
      dmasound.gain = GAIN_VOXWARE_TO_DB(gain);
      atari_microwire_cmd(MW_LM1992_VOLUME(dmasound.gain));
      return GAIN_DB_TO_VOXWARE(dmasound.gain);
}



/*
 * Falcon
 */


static void FalconSilence(void)
{
      /* stop playback, set sample rate 50kHz for PSG sound */
      tt_dmasnd.ctrl = DMASND_CTRL_OFF;
      tt_dmasnd.mode = DMASND_MODE_50KHZ | DMASND_MODE_STEREO | DMASND_MODE_8BIT;
      tt_dmasnd.int_div = 0; /* STE compatible divider */
      tt_dmasnd.int_ctrl = 0x0;
      tt_dmasnd.cbar_src = 0x0000; /* no matrix inputs */
      tt_dmasnd.cbar_dst = 0x0000; /* no matrix outputs */
      tt_dmasnd.dac_src = 1; /* connect ADC to DAC, disconnect matrix */
      tt_dmasnd.adc_src = 3; /* ADC Input = PSG */
}


static void FalconInit(void)
{
      int divider, i, idx;
      const int freq[8] = {49170, 32780, 24585, 19668, 16390, 12292, 9834, 8195};

      /* search a frequency that fits into the allowed error range */

      idx = -1;
      for (i = 0; i < ARRAY_SIZE(freq); i++)
            /* if we will tolerate 3% error 8000Hz->8195Hz (2.38%) would
             * be playable without expanding, but that now a kernel runtime
             * option
             */
            if ((100 * abs(dmasound.soft.speed - freq[i]) / freq[i]) < catchRadius)
                  idx = i;
      if (idx > -1) {
            dmasound.soft.speed = freq[idx];
            dmasound.trans_write = &transFalconNormal;
      } else
            dmasound.trans_write = &transFalconExpanding;

      FalconSilence();
      dmasound.hard = dmasound.soft;

      if (dmasound.hard.size == 16) {
            /* the Falcon can play 16bit samples only in stereo */
            dmasound.hard.stereo = 1;
      }

      if (dmasound.hard.speed > 49170) {
            /* we would need to squeeze the sound, but we won't do that */
            dmasound.hard.speed = 49170;
            divider = 1;
            dmasound.trans_write = &transFalconNormal;
      } else if (dmasound.hard.speed > 32780) {
            dmasound.hard.speed = 49170;
            divider = 1;
      } else if (dmasound.hard.speed > 24585) {
            dmasound.hard.speed = 32780;
            divider = 2;
      } else if (dmasound.hard.speed > 19668) {
            dmasound.hard.speed = 24585;
            divider = 3;
      } else if (dmasound.hard.speed > 16390) {
            dmasound.hard.speed = 19668;
            divider = 4;
      } else if (dmasound.hard.speed > 12292) {
            dmasound.hard.speed = 16390;
            divider = 5;
      } else if (dmasound.hard.speed > 9834) {
            dmasound.hard.speed = 12292;
            divider = 7;
      } else if (dmasound.hard.speed > 8195) {
            dmasound.hard.speed = 9834;
            divider = 9;
      } else {
            dmasound.hard.speed = 8195;
            divider = 11;
      }
      tt_dmasnd.int_div = divider;

      /* Setup Falcon sound DMA for playback */
      tt_dmasnd.int_ctrl = 0x4; /* Timer A int at play end */
      tt_dmasnd.track_select = 0x0; /* play 1 track, track 1 */
      tt_dmasnd.cbar_src = 0x0001; /* DMA(25MHz) --> DAC */
      tt_dmasnd.cbar_dst = 0x0000;
      tt_dmasnd.rec_track_select = 0;
      tt_dmasnd.dac_src = 2; /* connect matrix to DAC */
      tt_dmasnd.adc_src = 0; /* ADC Input = Mic */

      tt_dmasnd.mode = (dmasound.hard.stereo ?
                    DMASND_MODE_STEREO : DMASND_MODE_MONO) |
            ((dmasound.hard.size == 8) ?
             DMASND_MODE_8BIT : DMASND_MODE_16BIT) |
            DMASND_MODE_6KHZ;

      expand_bal = -dmasound.soft.speed;
}


static int FalconSetFormat(int format)
{
      int size;
      /* Falcon sound DMA supports 8bit and 16bit modes */

      switch (format) {
      case AFMT_QUERY:
            return dmasound.soft.format;
      case AFMT_MU_LAW:
      case AFMT_A_LAW:
      case AFMT_U8:
      case AFMT_S8:
            size = 8;
            break;
      case AFMT_S16_BE:
      case AFMT_U16_BE:
      case AFMT_S16_LE:
      case AFMT_U16_LE:
            size = 16;
            break;
      default: /* :-) */
            size = 8;
            format = AFMT_S8;
      }

      dmasound.soft.format = format;
      dmasound.soft.size = size;
      if (dmasound.minDev == SND_DEV_DSP) {
            dmasound.dsp.format = format;
            dmasound.dsp.size = dmasound.soft.size;
      }

      FalconInit();

      return format;
}


/* This is for the Falcon output *attenuation* in 1.5dB steps,
 * i.e. output level from 0 to -22.5dB in -1.5dB steps.
 */
#define VOLUME_VOXWARE_TO_ATT(v) \
      ((v) < 0 ? 15 : (v) > 100 ? 0 : 15 - (v) * 3 / 20)
#define VOLUME_ATT_TO_VOXWARE(v) (100 - (v) * 20 / 3)


static int FalconSetVolume(int volume)
{
      dmasound.volume_left = VOLUME_VOXWARE_TO_ATT(volume & 0xff);
      dmasound.volume_right = VOLUME_VOXWARE_TO_ATT((volume & 0xff00) >> 8);
      tt_dmasnd.output_atten = dmasound.volume_left << 8 | dmasound.volume_right << 4;
      return VOLUME_ATT_TO_VOXWARE(dmasound.volume_left) |
             VOLUME_ATT_TO_VOXWARE(dmasound.volume_right) << 8;
}


static void AtaPlayNextFrame(int index)
{
      char *start, *end;

      /* used by AtaPlay() if all doubts whether there really is something
       * to be played are already wiped out.
       */
      start = write_sq.buffers[write_sq.front];
      end = start+((write_sq.count == index) ? write_sq.rear_size
                                     : write_sq.block_size);
      /* end might not be a legal virtual address. */
      DMASNDSetEnd(virt_to_phys(end - 1) + 1);
      DMASNDSetBase(virt_to_phys(start));
      /* Since only an even number of samples per frame can
         be played, we might lose one byte here. (TO DO) */
      write_sq.front = (write_sq.front+1) % write_sq.max_count;
      write_sq.active++;
      tt_dmasnd.ctrl = DMASND_CTRL_ON | DMASND_CTRL_REPEAT;
}


static void AtaPlay(void)
{
      /* ++TeSche: Note that write_sq.active is no longer just a flag but
       * holds the number of frames the DMA is currently programmed for
       * instead, may be 0, 1 (currently being played) or 2 (pre-programmed).
       *
       * Changes done to write_sq.count and write_sq.active are a bit more
       * subtle again so now I must admit I also prefer disabling the irq
       * here rather than considering all possible situations. But the point
       * is that disabling the irq doesn't have any bad influence on this
       * version of the driver as we benefit from having pre-programmed the
       * DMA wherever possible: There's no need to reload the DMA at the
       * exact time of an interrupt but only at some time while the
       * pre-programmed frame is playing!
       */
      atari_disable_irq(IRQ_MFP_TIMA);

      if (write_sq.active == 2 ||   /* DMA is 'full' */
          write_sq.count <= 0) {    /* nothing to do */
            atari_enable_irq(IRQ_MFP_TIMA);
            return;
      }

      if (write_sq.active == 0) {
            /* looks like there's nothing 'in' the DMA yet, so try
             * to put two frames into it (at least one is available).
             */
            if (write_sq.count == 1 &&
                write_sq.rear_size < write_sq.block_size &&
                !write_sq.syncing) {
                  /* hmmm, the only existing frame is not
                   * yet filled and we're not syncing?
                   */
                  atari_enable_irq(IRQ_MFP_TIMA);
                  return;
            }
            AtaPlayNextFrame(1);
            if (write_sq.count == 1) {
                  /* no more frames */
                  atari_enable_irq(IRQ_MFP_TIMA);
                  return;
            }
            if (write_sq.count == 2 &&
                write_sq.rear_size < write_sq.block_size &&
                !write_sq.syncing) {
                  /* hmmm, there were two frames, but the second
                   * one is not yet filled and we're not syncing?
                   */
                  atari_enable_irq(IRQ_MFP_TIMA);
                  return;
            }
            AtaPlayNextFrame(2);
      } else {
            /* there's already a frame being played so we may only stuff
             * one new into the DMA, but even if this may be the last
             * frame existing the previous one is still on write_sq.count.
             */
            if (write_sq.count == 2 &&
                write_sq.rear_size < write_sq.block_size &&
                !write_sq.syncing) {
                  /* hmmm, the only existing frame is not
                   * yet filled and we're not syncing?
                   */
                  atari_enable_irq(IRQ_MFP_TIMA);
                  return;
            }
            AtaPlayNextFrame(2);
      }
      atari_enable_irq(IRQ_MFP_TIMA);
}


static irqreturn_t AtaInterrupt(int irq, void *dummy)
{
#if 0
      /* ++TeSche: if you should want to test this... */
      static int cnt;
      if (write_sq.active == 2)
            if (++cnt == 10) {
                  /* simulate losing an interrupt */
                  cnt = 0;
                  return IRQ_HANDLED;
            }
#endif
      spin_lock(&dmasound.lock);
      if (write_sq_ignore_int && is_falcon) {
            /* ++TeSche: Falcon only: ignore first irq because it comes
             * immediately after starting a frame. after that, irqs come
             * (almost) like on the TT.
             */
            write_sq_ignore_int = 0;
            return IRQ_HANDLED;
      }

      if (!write_sq.active) {
            /* playing was interrupted and sq_reset() has already cleared
             * the sq variables, so better don't do anything here.
             */
            WAKE_UP(write_sq.sync_queue);
            return IRQ_HANDLED;
      }

      /* Probably ;) one frame is finished. Well, in fact it may be that a
       * pre-programmed one is also finished because there has been a long
       * delay in interrupt delivery and we've completely lost one, but
       * there's no way to detect such a situation. In such a case the last
       * frame will be played more than once and the situation will recover
       * as soon as the irq gets through.
       */
      write_sq.count--;
      write_sq.active--;

      if (!write_sq.active) {
            tt_dmasnd.ctrl = DMASND_CTRL_OFF;
            write_sq_ignore_int = 1;
      }

      WAKE_UP(write_sq.action_queue);
      /* At least one block of the queue is free now
         so wake up a writing process blocked because
         of a full queue. */

      if ((write_sq.active != 1) || (write_sq.count != 1))
            /* We must be a bit carefully here: write_sq.count indicates the
             * number of buffers used and not the number of frames to be
             * played. If write_sq.count==1 and write_sq.active==1 that
             * means the only remaining frame was already programmed
             * earlier (and is currently running) so we mustn't call
             * AtaPlay() here, otherwise we'll play one frame too much.
             */
            AtaPlay();

      if (!write_sq.active) WAKE_UP(write_sq.sync_queue);
      /* We are not playing after AtaPlay(), so there
         is nothing to play any more. Wake up a process
         waiting for audio output to drain. */
      spin_unlock(&dmasound.lock);
      return IRQ_HANDLED;
}


/*** Mid level stuff *********************************************************/


/*
 * /dev/mixer abstraction
 */

#define RECLEVEL_VOXWARE_TO_GAIN(v) \
      ((v) < 0 ? 0 : (v) > 100 ? 15 : (v) * 3 / 20)
#define RECLEVEL_GAIN_TO_VOXWARE(v) (((v) * 20 + 2) / 3)


static void __init TTMixerInit(void)
{
      atari_microwire_cmd(MW_LM1992_VOLUME(0));
      dmasound.volume_left = 0;
      atari_microwire_cmd(MW_LM1992_BALLEFT(0));
      dmasound.volume_right = 0;
      atari_microwire_cmd(MW_LM1992_BALRIGHT(0));
      atari_microwire_cmd(MW_LM1992_TREBLE(0));
      atari_microwire_cmd(MW_LM1992_BASS(0));
}

static void __init FalconMixerInit(void)
{
      dmasound.volume_left = (tt_dmasnd.output_atten & 0xf00) >> 8;
      dmasound.volume_right = (tt_dmasnd.output_atten & 0xf0) >> 4;
}

static int AtaMixerIoctl(u_int cmd, u_long arg)
{
      int data;
      unsigned long flags;
      switch (cmd) {
          case SOUND_MIXER_READ_SPEAKER:
                if (is_falcon || MACH_IS_TT) {
                      int porta;
                      spin_lock_irqsave(&dmasound.lock, flags);
                      sound_ym.rd_data_reg_sel = 14;
                      porta = sound_ym.rd_data_reg_sel;
                      spin_unlock_irqrestore(&dmasound.lock, flags);
                      return IOCTL_OUT(arg, porta & 0x40 ? 0 : 100);
                }
                break;
          case SOUND_MIXER_WRITE_VOLUME:
                IOCTL_IN(arg, data);
                return IOCTL_OUT(arg, dmasound_set_volume(data));
          case SOUND_MIXER_WRITE_SPEAKER:
                if (is_falcon || MACH_IS_TT) {
                      int porta;
                      IOCTL_IN(arg, data);
                      spin_lock_irqsave(&dmasound.lock, flags);
                      sound_ym.rd_data_reg_sel = 14;
                      porta = (sound_ym.rd_data_reg_sel & ~0x40) |
                            (data < 50 ? 0x40 : 0);
                      sound_ym.wd_data = porta;
                      spin_unlock_irqrestore(&dmasound.lock, flags);
                      return IOCTL_OUT(arg, porta & 0x40 ? 0 : 100);
                }
      }
      return -EINVAL;
}


static int TTMixerIoctl(u_int cmd, u_long arg)
{
      int data;
      switch (cmd) {
          case SOUND_MIXER_READ_RECMASK:
            return IOCTL_OUT(arg, 0);
          case SOUND_MIXER_READ_DEVMASK:
            return IOCTL_OUT(arg,
                         SOUND_MASK_VOLUME | SOUND_MASK_TREBLE | SOUND_MASK_BASS |
                         (MACH_IS_TT ? SOUND_MASK_SPEAKER : 0));
          case SOUND_MIXER_READ_STEREODEVS:
            return IOCTL_OUT(arg, SOUND_MASK_VOLUME);
          case SOUND_MIXER_READ_VOLUME:
            return IOCTL_OUT(arg,
                         VOLUME_DB_TO_VOXWARE(dmasound.volume_left) |
                         (VOLUME_DB_TO_VOXWARE(dmasound.volume_right) << 8));
          case SOUND_MIXER_READ_BASS:
            return IOCTL_OUT(arg, TONE_DB_TO_VOXWARE(dmasound.bass));
          case SOUND_MIXER_READ_TREBLE:
            return IOCTL_OUT(arg, TONE_DB_TO_VOXWARE(dmasound.treble));
          case SOUND_MIXER_READ_OGAIN:
            return IOCTL_OUT(arg, GAIN_DB_TO_VOXWARE(dmasound.gain));
          case SOUND_MIXER_WRITE_BASS:
            IOCTL_IN(arg, data);
            return IOCTL_OUT(arg, dmasound_set_bass(data));
          case SOUND_MIXER_WRITE_TREBLE:
            IOCTL_IN(arg, data);
            return IOCTL_OUT(arg, dmasound_set_treble(data));
          case SOUND_MIXER_WRITE_OGAIN:
            IOCTL_IN(arg, data);
            return IOCTL_OUT(arg, dmasound_set_gain(data));
      }
      return AtaMixerIoctl(cmd, arg);
}

static int FalconMixerIoctl(u_int cmd, u_long arg)
{
      int data;
      switch (cmd) {
          case SOUND_MIXER_READ_RECMASK:
            return IOCTL_OUT(arg, SOUND_MASK_MIC);
          case SOUND_MIXER_READ_DEVMASK:
            return IOCTL_OUT(arg, SOUND_MASK_VOLUME | SOUND_MASK_MIC | SOUND_MASK_SPEAKER);
          case SOUND_MIXER_READ_STEREODEVS:
            return IOCTL_OUT(arg, SOUND_MASK_VOLUME | SOUND_MASK_MIC);
          case SOUND_MIXER_READ_VOLUME:
            return IOCTL_OUT(arg,
                  VOLUME_ATT_TO_VOXWARE(dmasound.volume_left) |
                  VOLUME_ATT_TO_VOXWARE(dmasound.volume_right) << 8);
          case SOUND_MIXER_READ_CAPS:
            return IOCTL_OUT(arg, SOUND_CAP_EXCL_INPUT);
          case SOUND_MIXER_WRITE_MIC:
            IOCTL_IN(arg, data);
            tt_dmasnd.input_gain =
                  RECLEVEL_VOXWARE_TO_GAIN(data & 0xff) << 4 |
                  RECLEVEL_VOXWARE_TO_GAIN(data >> 8 & 0xff);
            /* fall thru, return set value */
          case SOUND_MIXER_READ_MIC:
            return IOCTL_OUT(arg,
                  RECLEVEL_GAIN_TO_VOXWARE(tt_dmasnd.input_gain >> 4 & 0xf) |
                  RECLEVEL_GAIN_TO_VOXWARE(tt_dmasnd.input_gain & 0xf) << 8);
      }
      return AtaMixerIoctl(cmd, arg);
}

static int AtaWriteSqSetup(void)
{
      write_sq_ignore_int = 0;
      return 0 ;
}

static int AtaSqOpen(mode_t mode)
{
      write_sq_ignore_int = 1;
      return 0 ;
}

static int TTStateInfo(char *buffer, size_t space)
{
      int len = 0;
      len += sprintf(buffer+len, "\tvol left  %ddB [-40...  0]\n",
                   dmasound.volume_left);
      len += sprintf(buffer+len, "\tvol right %ddB [-40...  0]\n",
                   dmasound.volume_right);
      len += sprintf(buffer+len, "\tbass      %ddB [-12...+12]\n",
                   dmasound.bass);
      len += sprintf(buffer+len, "\ttreble    %ddB [-12...+12]\n",
                   dmasound.treble);
      if (len >= space) {
            printk(KERN_ERR "dmasound_atari: overflowed state buffer alloc.\n") ;
            len = space ;
      }
      return len;
}

static int FalconStateInfo(char *buffer, size_t space)
{
      int len = 0;
      len += sprintf(buffer+len, "\tvol left  %ddB [-22.5 ... 0]\n",
                   dmasound.volume_left);
      len += sprintf(buffer+len, "\tvol right %ddB [-22.5 ... 0]\n",
                   dmasound.volume_right);
      if (len >= space) {
            printk(KERN_ERR "dmasound_atari: overflowed state buffer alloc.\n") ;
            len = space ;
      }
      return len;
}


/*** Machine definitions *****************************************************/

static SETTINGS def_hard_falcon = {
      .format           = AFMT_S8,
      .stereo           = 0,
      .size       = 8,
      .speed            = 8195
} ;

static SETTINGS def_hard_tt = {
      .format     = AFMT_S8,
      .stereo     = 0,
      .size = 8,
      .speed      = 12517
} ;

static SETTINGS def_soft = {
      .format     = AFMT_U8,
      .stereo     = 0,
      .size = 8,
      .speed      = 8000
} ;

static MACHINE machTT = {
      .name       = "Atari",
      .name2            = "TT",
      .owner            = THIS_MODULE,
      .dma_alloc  = AtaAlloc,
      .dma_free   = AtaFree,
      .irqinit    = AtaIrqInit,
#ifdef MODULE
      .irqcleanup = AtaIrqCleanUp,
#endif /* MODULE */
      .init       = TTInit,
      .silence    = TTSilence,
      .setFormat  = TTSetFormat,
      .setVolume  = TTSetVolume,
      .setBass    = AtaSetBass,
      .setTreble  = AtaSetTreble,
      .setGain    = TTSetGain,
      .play       = AtaPlay,
      .mixer_init = TTMixerInit,
      .mixer_ioctl      = TTMixerIoctl,
      .write_sq_setup   = AtaWriteSqSetup,
      .sq_open    = AtaSqOpen,
      .state_info = TTStateInfo,
      .min_dsp_speed    = 6258,
      .version    = ((DMASOUND_ATARI_REVISION<<8) | DMASOUND_ATARI_EDITION),
      .hardware_afmts   = AFMT_S8,  /* h'ware-supported formats *only* here */
      .capabilities     =  DSP_CAP_BATCH  /* As per SNDCTL_DSP_GETCAPS */
};

static MACHINE machFalcon = {
      .name       = "Atari",
      .name2            = "FALCON",
      .dma_alloc  = AtaAlloc,
      .dma_free   = AtaFree,
      .irqinit    = AtaIrqInit,
#ifdef MODULE
      .irqcleanup = AtaIrqCleanUp,
#endif /* MODULE */
      .init       = FalconInit,
      .silence    = FalconSilence,
      .setFormat  = FalconSetFormat,
      .setVolume  = FalconSetVolume,
      .setBass    = AtaSetBass,
      .setTreble  = AtaSetTreble,
      .play       = AtaPlay,
      .mixer_init = FalconMixerInit,
      .mixer_ioctl      = FalconMixerIoctl,
      .write_sq_setup   = AtaWriteSqSetup,
      .sq_open    = AtaSqOpen,
      .state_info = FalconStateInfo,
      .min_dsp_speed    = 8195,
      .version    = ((DMASOUND_ATARI_REVISION<<8) | DMASOUND_ATARI_EDITION),
      .hardware_afmts   = (AFMT_S8 | AFMT_S16_BE), /* h'ware-supported formats *only* here */
      .capabilities     =  DSP_CAP_BATCH  /* As per SNDCTL_DSP_GETCAPS */
};


/*** Config & Setup **********************************************************/


static int __init dmasound_atari_init(void)
{
      if (MACH_IS_ATARI && ATARIHW_PRESENT(PCM_8BIT)) {
          if (ATARIHW_PRESENT(CODEC)) {
            dmasound.mach = machFalcon;
            dmasound.mach.default_soft = def_soft ;
            dmasound.mach.default_hard = def_hard_falcon ;
            is_falcon = 1;
          } else if (ATARIHW_PRESENT(MICROWIRE)) {
            dmasound.mach = machTT;
            dmasound.mach.default_soft = def_soft ;
            dmasound.mach.default_hard = def_hard_tt ;
            is_falcon = 0;
          } else
            return -ENODEV;
          if ((mfp.int_en_a & mfp.int_mk_a & 0x20) == 0)
            return dmasound_init();
          else {
            printk("DMA sound driver: Timer A interrupt already in use\n");
            return -EBUSY;
          }
      }
      return -ENODEV;
}

static void __exit dmasound_atari_cleanup(void)
{
      dmasound_deinit();
}

module_init(dmasound_atari_init);
module_exit(dmasound_atari_cleanup);
MODULE_LICENSE("GPL");

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