// SPDX-License-Identifier: GPL-2.0-only
/*
 *  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 <linux/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(fmode_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. */
        st_mfp.tim_ct_a = 0;    /* ++roman: Stop timer before programming! */
        st_mfp.tim_dt_a = 1;    /* Cause interrupt after first event. */
        st_mfp.tim_ct_a = 8;    /* Turn on event counting. */
        /* Register interrupt handler. */
        if (request_irq(IRQ_MFP_TIMA, AtaInterrupt, 0, "DMA sound",
                        AtaInterrupt))
                return 0;
        st_mfp.int_en_a |= 0x20;        /* Turn interrupt on. */
        st_mfp.int_mk_a |= 0x20;
        return 1;
}

#ifdef MODULE
static void AtaIrqCleanUp(void)
{
        st_mfp.tim_ct_a = 0;            /* stop timer */
        st_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;
                goto out;
        }

        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);
                goto out;
        }

        /* 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. */
out:
        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);
                fallthrough;    /* 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(fmode_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 __initdata 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 __initdata 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 ((st_mfp.int_en_a & st_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");