/*
 *  Matt Wu <Matt_Wu@acersoftech.com.cn>
 *  Apr 26, 2001
 *  Routines for control of ALi pci audio M5451
 *
 *  BUGS:
 *    --
 *
 *  TODO:
 *    --
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public Lcodecnse as published by
 *   the Free Software Foundation; either version 2 of the Lcodecnse, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public Lcodecnse for more details.
 *
 *   You should have received a copy of the GNU General Public Lcodecnse
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#define __SNDRV_OSS_COMPAT__
#define SNDRV_MAIN_OBJECT_FILE

#include "sound/driver.h"
#include "sound/pcm.h"
#include "sound/info.h"
#include "sound/ac97_codec.h"
#include "sound/mpu401.h"
#define SNDRV_GET_ID
#include "sound/initval.h"

MODULE_AUTHOR("Matt Wu <Matt_Wu@acersoftech.com.cn>");
MODULE_DESCRIPTION("ALI M5451");
MODULE_LICENSE("GPL");
MODULE_CLASSES("{sound}");
MODULE_DEVICES("{{ALI,M5451,pci},{ALI,M5451}}");

static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;	/* Index 0-MAX */
static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;	/* ID for this card */
static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
#ifdef TARGET_OS2
static int pcm_channels[SNDRV_CARDS] = {REPEAT_SNDRV(32)};
#else
static int pcm_channels[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 32};
#endif
static int spdif[SNDRV_CARDS] = {REPEAT_SNDRV(0)};

MODULE_PARM(index, "1-" __MODULE_STRING(SNDRV_CARDS) "i");
MODULE_PARM_DESC(index, "Index value for ALI M5451 PCI Audio.");
MODULE_PARM_SYNTAX(index, SNDRV_INDEX_DESC);
MODULE_PARM(id, "1-" __MODULE_STRING(SNDRV_CARDS) "s");
MODULE_PARM_DESC(id, "ID string for ALI M5451 PCI Audio.");
MODULE_PARM_SYNTAX(id, SNDRV_ID_DESC);
MODULE_PARM(enable, "1-" __MODULE_STRING(SNDRV_CARDS) "i");
MODULE_PARM_DESC(enable, "Enable ALI 5451 PCI Audio.");
MODULE_PARM_SYNTAX(enable, SNDRV_ENABLE_DESC);
MODULE_PARM(pcm_channels, "1-" __MODULE_STRING(SNDRV_CARDS) "l");
MODULE_PARM_DESC(pcm_channels, "PCM Channels");
MODULE_PARM_SYNTAX(pcm_channels, SNDRV_ENABLED ",default:32,allows:{{1,32}}");
MODULE_PARM(spdif, "1-" __MODULE_STRING(SNDRV_CARDS) "l");
MODULE_PARM_DESC(spdif, "Support SPDIF I/O");
MODULE_PARM_SYNTAX(spdif, SNDRV_ENABLED "," SNDRV_BOOLEAN_FALSE_DESC);

/*
 *  Debug part definitions
 */

//#define ALI_DEBUG

#ifdef TARGET_OS2
#ifdef ALI_DEBUG
#define snd_ali_printk printk
#else
#define snd_ali_printk 1 ? (void)0 : (void)((int (*)(char *, ...)) NULL)
#endif
#else
#ifdef ALI_DEBUG
#define snd_ali_printk(a...) printk(a);
#else
#define snd_ali_printk(a...)
#endif
#endif

/*
 *  Constants definition
 */

#ifndef PCI_VENDOR_ID_ALI
#define PCI_VENDOR_ID_ALI	0x10b9
#endif

#ifndef PCI_DEVICE_ID_ALI_5451
#define PCI_DEVICE_ID_ALI_5451	0x5451
#endif

#define DEVICE_ID_ALI5451	((PCI_VENDOR_ID_ALI<<16)|PCI_DEVICE_ID_ALI_5451)


#define ALI_CHANNELS		32

#define ALI_PCM_IN_CHANNEL	31
#define ALI_SPDIF_IN_CHANNEL	19
#define ALI_SPDIF_OUT_CHANNEL	15
#define ALI_CENTER_CHANNEL	24
#define ALI_LEF_CHANNEL		23
#define ALI_SURR_LEFT_CHANNEL	26
#define ALI_SURR_RIGHT_CHANNEL	25

#define	SNDRV_ALI_VOICE_TYPE_PCM	01
#define SNDRV_ALI_VOICE_TYPE_OTH	02

#define	ALI_5451_V02		0x02

/*
 *  Direct Registers
 */

#define ALI_LEGACY_DMAR0        0x00  // ADR0
#define ALI_LEGACY_DMAR4        0x04  // CNT0
#define ALI_LEGACY_DMAR11       0x0b  // MOD
#define ALI_LEGACY_DMAR15       0x0f  // MMR
#define ALI_MPUR0		0x20
#define ALI_MPUR1		0x21
#define ALI_MPUR2		0x22
#define ALI_MPUR3		0x23

#define	ALI_AC97_WRITE		0x40
#define ALI_AC97_READ		0x44

#define ALI_SCTRL		0x48
#define   ALI_SPDIF_OUT_ENABLE		0x20
#define ALI_AC97_GPIO		0x4c
#define ALI_SPDIF_CS		0x70
#define ALI_SPDIF_CTRL		0x74
#define   ALI_SPDIF_IN_FUNC_ENABLE	0x02
#define   ALI_SPDIF_IN_CH_STATUS	0x40
#define   ALI_SPDIF_OUT_CH_STATUS	0xbf
#define ALI_START		0x80
#define ALI_STOP		0x84
#define ALI_CSPF		0x90
#define ALI_AINT		0x98
#define ALI_GC_CIR		0xa0
#define ENDLP_IE		0x00001000
#define MIDLP_IE		0x00002000
#define ALI_AINTEN		0xa4
#define ALI_VOLUME		0xa8
#define ALI_SBDELTA_DELTA_R     0xac
#define ALI_MISCINT		0xb0
#define ADDRESS_IRQ		0x00000020
#define TARGET_REACHED		0x00008000
#define MIXER_OVERFLOW		0x00000800
#define MIXER_UNDERFLOW		0x00000400
#define ALI_SBBL_SBCL           0xc0
#define ALI_SBCTRL_SBE2R_SBDD   0xc4
#define ALI_STIMER		0xc8
#define ALI_GLOBAL_CONTROL	0xd4
#define   ALI_SPDIF_OUT_SEL_PCM		0x00000400 /* bit 10 */
#define   ALI_SPDIF_IN_SUPPORT		0x00000800 /* bit 11 */
#define   ALI_SPDIF_OUT_CH_ENABLE	0x00008000 /* bit 15 */
#define   ALI_SPDIF_IN_CH_ENABLE	0x00080000 /* bit 19 */
#define   ALI_PCM_IN_ENABLE		0x80000000 /* bit 31 */

#define ALI_CSO_ALPHA_FMS	0xe0
#define ALI_LBA			0xe4
#define ALI_ESO_DELTA		0xe8
#define ALI_GVSEL_PAN_VOC_CTRL_EC	0xf0
#define ALI_EBUF1		0xf4
#define ALI_EBUF2		0xf8

#define ALI_REG(codec, x) ((codec)->port + x)

typedef struct snd_stru_ali ali_t;
typedef struct snd_ali_stru_voice snd_ali_voice_t;

typedef struct snd_ali_channel_control {
    // register data
    struct REGDATA {
        unsigned int start;
        unsigned int stop;
        unsigned int aint;
        unsigned int ainten;
    } data;

    // register addresses
    struct REGS {
        unsigned int start;
        unsigned int stop;
        unsigned int aint;
        unsigned int ainten;
        unsigned int ac97read;
        unsigned int ac97write;
    } regs;

} snd_ali_channel_control_t;

struct snd_ali_stru_voice {
    unsigned int number;
    int use: 1,
    pcm: 1,
    midi: 1,
    mode: 1,
    synth: 1;

    /* PCM data */
    ali_t *codec;
    snd_pcm_substream_t *substream;
    snd_ali_voice_t *extra;

    int running: 1;

    int eso;                /* final ESO value for channel */
    int count;              /* runtime->period_size */

    /* --- */

    void *private_data;
    void (*private_free)(void *private_data);
};


typedef struct snd_stru_alidev {

    snd_ali_voice_t voices[ALI_CHANNELS];

    unsigned int	chcnt;			/* num of opened channels */
    unsigned int	chmap;			/* bitmap for opened channels */
    unsigned int synthcount;

} alidev_t;


#ifdef CONFIG_PM
#define ALI_GLOBAL_REGS		56
#define ALI_CHANNEL_REGS	8
typedef struct snd_ali_image {
    unsigned long regs[ALI_GLOBAL_REGS];
    unsigned long channel_regs[ALI_CHANNELS][ALI_CHANNEL_REGS];
} ali_image_t;
#endif


struct snd_stru_ali {
    unsigned long	irq;
    unsigned long	port;
    unsigned char	revision;

    unsigned int hw_initialized: 1;
    unsigned int spdif_support: 1;

    struct pci_dev	*pci;
    struct pci_dev	*pci_m1533;
    struct pci_dev	*pci_m7101;

    snd_card_t	*card;
    snd_pcm_t	*pcm;
    alidev_t	synth;
    snd_ali_channel_control_t chregs;

    /* S/PDIF Mask */
    unsigned int	spdif_mask;

    unsigned int spurious_irq_count;
    unsigned int spurious_irq_max_delta;

    ac97_bus_t *ac97_bus;
    ac97_t *ac97;
    unsigned short	ac97_ext_id;
    unsigned short	ac97_ext_status;

    spinlock_t	reg_lock;
    spinlock_t	voice_alloc;

#ifdef CONFIG_PM
    ali_image_t *image;
#endif
};

static struct pci_device_id snd_ali_ids[] = {
    {0x10b9, 0x5451, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
    {0 }
};

MODULE_DEVICE_TABLE(pci, snd_ali_ids);

static void snd_ali_clear_voices(ali_t *, unsigned int, unsigned int);
static unsigned short snd_ali_codec_peek(ali_t *, int, unsigned short);
static void snd_ali_codec_poke(ali_t *, int, unsigned short, unsigned short);

/*
 *  Debug Part
 */

#ifdef ALI_DEBUG

static void ali_read_regs(ali_t *codec, int channel)
{
    int i,j;
    unsigned int dwVal;

    printk("channel %d registers map:\n", channel);
    outb((unsigned char)(channel & 0x001f), ALI_REG(codec,ALI_GC_CIR));

    printk("    ");
    for(j=0;j<8;j++)
        printk("%2.2x       ", j*4);
    printk("\n");

    for (i=0; i<=0xf8/4;i++) {
        if(i%8 == 0)
            printk("%2.2x  ", (i*4/0x10)*0x10);
        dwVal = inl(ALI_REG(codec,i*4));
        printk("%8.8x ", dwVal);
        if ((i+1)%8 == 0)
            printk("\n");
    }
    printk("\n");
}
static void ali_read_cfg(unsigned int vendor, unsigned deviceid)
{
    unsigned int dwVal;
    struct pci_dev *pci_dev = NULL;
    int i,j;


    pci_dev = pci_find_device(vendor, deviceid, pci_dev);
    if (pci_dev == NULL)
        return ;

    printk("\nM%x PCI CFG\n", deviceid);
    printk("    ");
    for(j=0;j<8;j++)
        printk("%d        ",j);
    printk("\n");

    for(i=0;i<8;i++) {
        printk("%d   ",i);
        for(j=0;j<8;j++)
        {
            pci_read_config_dword(pci_dev, i*0x20+j*4, &dwVal);
            printk("%8.8x ", dwVal);
        }
        printk("\n");
    }
}
static void ali_read_ac97regs(ali_t *codec, int secondary)
{
    unsigned short i,j;
    unsigned short wVal;

    printk("\ncodec %d registers map:\n", secondary);

    printk("    ");
    for(j=0;j<8;j++)
        printk("%2.2x   ",j*2);
    printk("\n");

    for (i=0; i<64;i++) {
        if(i%8 == 0)
            printk("%2.2x  ", (i/8)*0x10);
        wVal = snd_ali_codec_peek(codec, secondary, i*2);
        printk("%4.4x ", wVal);
        if ((i+1)%8 == 0)
            printk("\n");
    }
    printk("\n");
}

#endif

/*
 *  AC97 ACCESS
 */

static inline unsigned int snd_ali_5451_peek(ali_t *codec,
                                             unsigned int port )
{
    return (unsigned int)inl(ALI_REG(codec, port));
}

static inline void snd_ali_5451_poke(	ali_t *codec,
                                     unsigned int port,
                                     unsigned int val )
{
    outl((unsigned int)val, ALI_REG(codec, port));
}

static int snd_ali_codec_ready(	ali_t *codec,
                               unsigned int port,
                               int sched )
{
    unsigned long end_time;
    unsigned int res;

    end_time = jiffies + 10 * msecs_to_jiffies(250);
    do {
        res = snd_ali_5451_peek(codec,port);
        if (! (res & 0x8000))
            return 0;
        if (sched) {
            set_current_state(TASK_UNINTERRUPTIBLE);
            schedule_timeout(1);
        }
    } while (time_after_eq(end_time, jiffies));
    snd_ali_5451_poke(codec, port, res & ~0x8000);
    snd_printdd("ali_codec_ready: codec is not ready.\n ");
    return -EIO;
}

static int snd_ali_stimer_ready(ali_t *codec, int sched)
{
    unsigned long end_time;
    unsigned long dwChk1,dwChk2;

    dwChk1 = snd_ali_5451_peek(codec, ALI_STIMER);
    dwChk2 = snd_ali_5451_peek(codec, ALI_STIMER);

    end_time = jiffies + 10 * msecs_to_jiffies(250);
    do {
        dwChk2 = snd_ali_5451_peek(codec, ALI_STIMER);
        if (dwChk2 != dwChk1)
            return 0;
        if (sched) {
            set_current_state(TASK_UNINTERRUPTIBLE);
            schedule_timeout(1);
        }
    } while (time_after_eq(end_time, jiffies));
    snd_printk("ali_stimer_read: stimer is not ready.\n");
    return -EIO;
}

static void snd_ali_codec_poke(ali_t *codec,int secondary,
                               unsigned short reg,
                               unsigned short val)
{
    unsigned int dwVal = 0;
    unsigned int port = 0;

    if (reg >= 0x80) {
        snd_printk("ali_codec_poke: reg(%xh) invalid.\n", reg);
        return;
    }

    port = codec->chregs.regs.ac97write;

    if (snd_ali_codec_ready(codec, port, 0) < 0)
        return;
    if (snd_ali_stimer_ready(codec, 0) < 0)
        return;

    dwVal  = (unsigned int) (reg & 0xff);
    dwVal |= 0x8000 | (val << 16);
    if (secondary) dwVal |= 0x0080;
    if (codec->revision == ALI_5451_V02) dwVal |= 0x0100;

    snd_ali_5451_poke(codec,port,dwVal);

    return ;
}

static unsigned short snd_ali_codec_peek( ali_t *codec,
                                         int secondary,
                                         unsigned short reg)
{
    unsigned int dwVal = 0;
    unsigned int port = 0;

    if (reg >= 0x80) {
        snd_printk("ali_codec_peek: reg(%xh) invalid.\n", reg);
        return ~0;
    }

    port = codec->chregs.regs.ac97read;

    if (snd_ali_codec_ready(codec, port, 0) < 0)
        return ~0;
    if (snd_ali_stimer_ready(codec, 0) < 0)
        return ~0;

    dwVal  = (unsigned int) (reg & 0xff);
    dwVal |= 0x8000;				/* bit 15*/
    if (secondary) dwVal |= 0x0080;

    snd_ali_5451_poke(codec, port, dwVal);

    if (snd_ali_stimer_ready(codec, 0) < 0)
        return ~0;
    if (snd_ali_codec_ready(codec, port, 0) < 0)
        return ~0;

    return (snd_ali_5451_peek(codec, port) & 0xffff0000)>>16;
}

static void snd_ali_codec_write(ac97_t *ac97,
                                unsigned short reg,
                                unsigned short val )
{
    ali_t *codec = ac97->private_data;

    snd_ali_printk("codec_write: reg=%xh data=%xh.\n", reg, val);
    snd_ali_codec_poke(codec, 0, reg, val);
    return ;
}


static unsigned short snd_ali_codec_read(ac97_t *ac97, unsigned short reg)
{
    ali_t *codec = ac97->private_data;

    snd_ali_printk("codec_read reg=%xh.\n", reg);
    return (snd_ali_codec_peek(codec, 0, reg));
}

/*
 *	AC97 Reset
 */

static int snd_ali_reset_5451(ali_t *codec)
{
    struct pci_dev *pci_dev = NULL;
    unsigned short wCount, wReg;
    unsigned int   dwVal;

    if ((pci_dev = codec->pci_m1533) != NULL) {
        pci_read_config_dword(pci_dev, 0x7c, &dwVal);
        pci_write_config_dword(pci_dev, 0x7c, dwVal | 0x08000000);
        udelay(5000);
        pci_read_config_dword(pci_dev, 0x7c, &dwVal);
        pci_write_config_dword(pci_dev, 0x7c, dwVal & 0xf7ffffff);
        udelay(5000);
    }

    pci_dev = codec->pci;
    pci_read_config_dword(pci_dev, 0x44, &dwVal);
    pci_write_config_dword(pci_dev, 0x44, dwVal | 0x000c0000);
    udelay(500);
    pci_read_config_dword(pci_dev, 0x44, &dwVal);
    pci_write_config_dword(pci_dev, 0x44, dwVal & 0xfffbffff);
    udelay(5000);

    wCount = 200;
    while(wCount--) {
        wReg = snd_ali_codec_peek(codec, 0, AC97_POWERDOWN);
        if((wReg & 0x000f) == 0x000f)
            return 0;
        udelay(5000);
    }

    /* non-fatal if you have a non PM capable codec */
    /* snd_printk(KERN_WARNING "ali5451: reset time out\n"); */
    return 0;
}

#ifdef CODEC_RESET

static int snd_ali_reset_codec(ali_t *codec)
{
    struct pci_dev *pci_dev = NULL;
    unsigned char bVal = 0;
    unsigned int   dwVal;
    unsigned short wCount, wReg;

    pci_dev = codec->pci_m1533;

    pci_read_config_dword(pci_dev, 0x7c, &dwVal);
    pci_write_config_dword(pci_dev, 0x7c, dwVal | 0x08000000);
    udelay(5000);
    pci_read_config_dword(pci_dev, 0x7c, &dwVal);
    pci_write_config_dword(pci_dev, 0x7c, dwVal & 0xf7ffffff);
    udelay(5000);

    bVal = inb(ALI_REG(codec,ALI_SCTRL));
    bVal |= 0x02;
    outb(ALI_REG(codec,ALI_SCTRL),bVal);
    udelay(5000);
    bVal = inb(ALI_REG(codec,ALI_SCTRL));
    bVal &= 0xfd;
    outb(ALI_REG(codec,ALI_SCTRL),bVal);
    udelay(15000);

    wCount = 200;
    while(wCount--) {
        wReg = snd_ali_codec_read(codec->ac97, AC97_POWERDOWN);
        if((wReg & 0x000f) == 0x000f)
            return 0;
        udelay(5000);
    }
    return -1;
}

#endif

/*
 *  ALI 5451 Controller
 */

static void snd_ali_enable_special_channel(ali_t *codec, unsigned int channel)
{
    unsigned long dwVal = 0;

    dwVal  = inl(ALI_REG(codec,ALI_GLOBAL_CONTROL));
    dwVal |= 1 << (channel & 0x0000001f);
    outl(dwVal, ALI_REG(codec,ALI_GLOBAL_CONTROL));
}

static void snd_ali_disable_special_channel(ali_t *codec, unsigned int channel)
{
    unsigned long dwVal = 0;

    dwVal  = inl(ALI_REG(codec,ALI_GLOBAL_CONTROL));
    dwVal &= ~(1 << (channel & 0x0000001f));
    outl(dwVal, ALI_REG(codec,ALI_GLOBAL_CONTROL));
}

static void snd_ali_enable_address_interrupt(ali_t * codec)
{
    unsigned int gc;

    gc  = inl(ALI_REG(codec, ALI_GC_CIR));
    gc |= ENDLP_IE;
    gc |= MIDLP_IE;
    outl( gc, ALI_REG(codec, ALI_GC_CIR));
}

static void snd_ali_disable_address_interrupt(ali_t * codec)
{
    unsigned int gc;

    gc  = inl(ALI_REG(codec, ALI_GC_CIR));
    gc &= ~ENDLP_IE;
    gc &= ~MIDLP_IE;
    outl(gc, ALI_REG(codec, ALI_GC_CIR));
}

#if 0 // not used
static void snd_ali_enable_voice_irq(ali_t *codec, unsigned int channel)
{
    unsigned int mask;
    snd_ali_channel_control_t *pchregs = &(codec->chregs);

    snd_ali_printk("enable_voice_irq channel=%d\n",channel);

    mask = 1 << (channel & 0x1f);
    pchregs->data.ainten  = inl(ALI_REG(codec,pchregs->regs.ainten));
    pchregs->data.ainten |= mask;
    outl(pchregs->data.ainten,ALI_REG(codec,pchregs->regs.ainten));
}
#endif

static void snd_ali_disable_voice_irq(ali_t *codec, unsigned int channel)
{
    unsigned int mask;
    snd_ali_channel_control_t *pchregs = &(codec->chregs);

    snd_ali_printk("disable_voice_irq channel=%d\n",channel);

    mask = 1 << (channel & 0x1f);
    pchregs->data.ainten  = inl(ALI_REG(codec,pchregs->regs.ainten));
    pchregs->data.ainten &= ~mask;
    outl(pchregs->data.ainten,ALI_REG(codec,pchregs->regs.ainten));
}

static int snd_ali_alloc_pcm_channel(ali_t *codec, int channel)
{
    unsigned int idx =  channel & 0x1f;

    if (codec->synth.chcnt >= ALI_CHANNELS){
        snd_printk("ali_alloc_pcm_channel: no free channels.\n");
        return -1;
    }

    if (!(codec->synth.chmap & (1 << idx))) {
        codec->synth.chmap |= 1 << idx;
        codec->synth.chcnt++;
        snd_ali_printk("alloc_pcm_channel no. %d.\n",idx);
        return idx;
    }
    return -1;
}

static int snd_ali_find_free_channel(ali_t * codec, int rec)
{
    int idx;
    int result = -1;

    snd_ali_printk("find_free_channel: for %s\n",rec ? "rec" : "pcm");

    // recording
    if (rec) {
        if (codec->spdif_support &&
            (inl(ALI_REG(codec, ALI_GLOBAL_CONTROL)) & ALI_SPDIF_IN_SUPPORT))
            idx = ALI_SPDIF_IN_CHANNEL;
        else
            idx = ALI_PCM_IN_CHANNEL;

        if ((result = snd_ali_alloc_pcm_channel(codec,idx)) >= 0) {
            return result;
        } else {
            snd_printk("ali_find_free_channel: record channel is busy now.\n");
            return -1;
        }
    }

    //playback...
    if (codec->spdif_support &&
        (inl(ALI_REG(codec, ALI_GLOBAL_CONTROL)) & ALI_SPDIF_OUT_CH_ENABLE)) {
        idx = ALI_SPDIF_OUT_CHANNEL;
        if ((result = snd_ali_alloc_pcm_channel(codec,idx)) >= 0) {
            return result;
        } else {
            snd_printk("ali_find_free_channel: S/PDIF out channel is in busy now.\n");
        }
    }

    for (idx = 0; idx < ALI_CHANNELS; idx++) {
        if ((result = snd_ali_alloc_pcm_channel(codec,idx)) >= 0)
            return result;
    }
    snd_printk("ali_find_free_channel: no free channels.\n");
    return -1;
}

static void snd_ali_free_channel_pcm(ali_t *codec, int channel)
{
    unsigned int idx = channel & 0x0000001f;

    snd_ali_printk("free_channel_pcm channel=%d\n",channel);

    if (channel < 0 || channel >= ALI_CHANNELS)
        return;

    if (!(codec->synth.chmap & (1 << idx))) {
        snd_printk("ali_free_channel_pcm: channel %d is not in use.\n",channel);
        return;
    } else {
        codec->synth.chmap &= ~(1 << idx);
        codec->synth.chcnt--;
    }
}

#if 0 // not used
static void snd_ali_start_voice(ali_t * codec, unsigned int channel)
{
    unsigned int mask = 1 << (channel & 0x1f);

    snd_ali_printk("start_voice: channel=%d\n",channel);
    outl(mask, ALI_REG(codec,codec->chregs.regs.start));
}
#endif

static void snd_ali_stop_voice(ali_t * codec, unsigned int channel)
{
    unsigned int mask = 1 << (channel & 0x1f);

    snd_ali_printk("stop_voice: channel=%d\n",channel);
    outl(mask, ALI_REG(codec, codec->chregs.regs.stop));
}

/*
 *    S/PDIF Part
 */

static void snd_ali_delay(ali_t *codec,int interval)
{
    unsigned long  begintimer,currenttimer;

    begintimer   = inl(ALI_REG(codec, ALI_STIMER));
    currenttimer = inl(ALI_REG(codec, ALI_STIMER));

    while (currenttimer < begintimer + interval) {
        if(snd_ali_stimer_ready(codec, 1) < 0)
            break;
        currenttimer = inl(ALI_REG(codec,  ALI_STIMER));
    }
}

static void snd_ali_detect_spdif_rate(ali_t *codec)
{
    u16 wval  = 0;
    u16 count = 0;
    u8  bval = 0, R1 = 0, R2 = 0;

    bval  = inb(ALI_REG(codec,ALI_SPDIF_CTRL + 1));
    bval |= 0x1F;
    outb(bval,ALI_REG(codec,ALI_SPDIF_CTRL + 1));

    while (((R1 < 0x0B )||(R1 > 0x0E)) && (R1 != 0x12) && count <= 50000) {
        count ++;
        snd_ali_delay(codec, 6);
        bval = inb(ALI_REG(codec,ALI_SPDIF_CTRL + 1));
        R1 = bval & 0x1F;
    }

    if (count > 50000) {
        snd_printk("ali_detect_spdif_rate: timeout!\n");
        return;
    }

    count = 0;
    while (count++ <= 50000) {
        snd_ali_delay(codec, 6);
        bval = inb(ALI_REG(codec,ALI_SPDIF_CTRL + 1));
        R2 = bval & 0x1F;
        if (R2 != R1) R1 = R2; else break;
    }

    if (count > 50000) {
        snd_printk("ali_detect_spdif_rate: timeout!\n");
        return;
    }

    if (R2 >= 0x0b && R2 <= 0x0e) {
        wval  = inw(ALI_REG(codec,ALI_SPDIF_CTRL + 2));
        wval &= 0xE0F0;
        wval |= (u16)0x09 << 8 | (u16)0x05;
        outw(wval,ALI_REG(codec,ALI_SPDIF_CTRL + 2));

        bval  = inb(ALI_REG(codec,ALI_SPDIF_CS +3)) & 0xF0;
        outb(bval|0x02,ALI_REG(codec,ALI_SPDIF_CS + 3));
    } else if (R2 == 0x12) {
        wval  = inw(ALI_REG(codec,ALI_SPDIF_CTRL + 2));
        wval &= 0xE0F0;
        wval |= (u16)0x0E << 8 | (u16)0x08;
        outw(wval,ALI_REG(codec,ALI_SPDIF_CTRL + 2));

        bval  = inb(ALI_REG(codec,ALI_SPDIF_CS +3)) & 0xF0;
        outb(bval|0x03,ALI_REG(codec,ALI_SPDIF_CS + 3));
    }
}

static unsigned int snd_ali_get_spdif_in_rate(ali_t *codec)
{
    u32	dwRate = 0;
    u8	bval = 0;

    bval  = inb(ALI_REG(codec,ALI_SPDIF_CTRL));
    bval &= 0x7F;
    bval |= 0x40;
    outb(bval, ALI_REG(codec,ALI_SPDIF_CTRL));

    snd_ali_detect_spdif_rate(codec);

    bval  = inb(ALI_REG(codec,ALI_SPDIF_CS + 3));
    bval &= 0x0F;

    if (bval == 0) dwRate = 44100;
    if (bval == 1) dwRate = 48000;
    if (bval == 2) dwRate = 32000;

    return dwRate;
}

static void snd_ali_enable_spdif_in(ali_t *codec)
{
    unsigned int dwVal;

    dwVal = inl(ALI_REG(codec, ALI_GLOBAL_CONTROL));
    dwVal |= ALI_SPDIF_IN_SUPPORT;
    outl(dwVal, ALI_REG(codec, ALI_GLOBAL_CONTROL));

    dwVal = inb(ALI_REG(codec, ALI_SPDIF_CTRL));
    dwVal |= 0x02;
    outb(dwVal, ALI_REG(codec, ALI_SPDIF_CTRL));

    snd_ali_enable_special_channel(codec, ALI_SPDIF_IN_CHANNEL);
}

static void snd_ali_disable_spdif_in(ali_t *codec)
{
    unsigned int dwVal;

    dwVal = inl(ALI_REG(codec, ALI_GLOBAL_CONTROL));
    dwVal &= ~ALI_SPDIF_IN_SUPPORT;
    outl(dwVal, ALI_REG(codec, ALI_GLOBAL_CONTROL));

    snd_ali_disable_special_channel(codec, ALI_SPDIF_IN_CHANNEL);
}


static void snd_ali_set_spdif_out_rate(ali_t *codec, unsigned int rate)
{
    unsigned char  bVal;
    unsigned int  dwRate = 0;

    if (rate == 32000) dwRate = 0x300;
    if (rate == 44100) dwRate = 0;
    if (rate == 48000) dwRate = 0x200;

    bVal  = inb(ALI_REG(codec, ALI_SPDIF_CTRL));
    bVal &= (unsigned char)(~(1<<6));

    bVal |= 0x80;		//select right
    outb(bVal, ALI_REG(codec, ALI_SPDIF_CTRL));
    outb(dwRate | 0x20, ALI_REG(codec, ALI_SPDIF_CS + 2));

    bVal &= (~0x80);	//select left
    outb(bVal, ALI_REG(codec, ALI_SPDIF_CTRL));
    outw(rate | 0x10, ALI_REG(codec, ALI_SPDIF_CS + 2));
}

static void snd_ali_enable_spdif_out(ali_t *codec)
{
    unsigned short wVal;
    unsigned char bVal;

    struct pci_dev *pci_dev = NULL;

    pci_dev = codec->pci_m1533;
    if (pci_dev == NULL)
        return;
    pci_read_config_byte(pci_dev, 0x61, &bVal);
    bVal |= 0x40;
    pci_write_config_byte(pci_dev, 0x61, bVal);
    pci_read_config_byte(pci_dev, 0x7d, &bVal);
    bVal |= 0x01;
    pci_write_config_byte(pci_dev, 0x7d, bVal);

    pci_read_config_byte(pci_dev, 0x7e, &bVal);
    bVal &= (~0x20);
    bVal |= 0x10;
    pci_write_config_byte(pci_dev, 0x7e, bVal);

    bVal = inb(ALI_REG(codec, ALI_SCTRL));
    outb(bVal | ALI_SPDIF_OUT_ENABLE, ALI_REG(codec, ALI_SCTRL));

    bVal = inb(ALI_REG(codec, ALI_SPDIF_CTRL));
    outb(bVal & ALI_SPDIF_OUT_CH_STATUS, ALI_REG(codec, ALI_SPDIF_CTRL));

    {
        wVal = inw(ALI_REG(codec, ALI_GLOBAL_CONTROL));
        wVal |= ALI_SPDIF_OUT_SEL_PCM;
        outw(wVal, ALI_REG(codec, ALI_GLOBAL_CONTROL));
        snd_ali_disable_special_channel(codec,ALI_SPDIF_OUT_CHANNEL);
    }
}

static void snd_ali_enable_spdif_chnout(ali_t *codec)
{
    unsigned short wVal = 0;

    wVal  = inw(ALI_REG(codec, ALI_GLOBAL_CONTROL));
    wVal &= ~ALI_SPDIF_OUT_SEL_PCM;
    outw(wVal, ALI_REG(codec, ALI_GLOBAL_CONTROL));
    /*
     wVal = inw(ALI_REG(codec, ALI_SPDIF_CS));
     if (flag & ALI_SPDIF_OUT_NON_PCM)
     wVal |= 0x0002;
     else
     wVal &= (~0x0002);
     outw(wVal, ALI_REG(codec, ALI_SPDIF_CS));
     */
    snd_ali_enable_special_channel(codec,ALI_SPDIF_OUT_CHANNEL);
}

static void snd_ali_disable_spdif_chnout(ali_t *codec)
{
    unsigned short wVal = 0;
    wVal  = inw(ALI_REG(codec, ALI_GLOBAL_CONTROL));
    wVal |= ALI_SPDIF_OUT_SEL_PCM;
    outw(wVal, ALI_REG(codec, ALI_GLOBAL_CONTROL));

    snd_ali_enable_special_channel(codec, ALI_SPDIF_OUT_CHANNEL);
}

static void snd_ali_disable_spdif_out(ali_t *codec)
{
    unsigned char  bVal;

    bVal = inb(ALI_REG(codec, ALI_SCTRL));
    outb(bVal & ~ALI_SPDIF_OUT_ENABLE, ALI_REG(codec, ALI_SCTRL));

    snd_ali_disable_spdif_chnout(codec);
}

static void snd_ali_update_ptr(ali_t *codec,int channel)
{
    snd_ali_voice_t *pvoice = NULL;
    snd_pcm_runtime_t *runtime;
    snd_ali_channel_control_t *pchregs = NULL;
    unsigned int old, mask;
#ifdef ALI_DEBUG
    unsigned int temp, cspf;
#endif

    pchregs = &(codec->chregs);

    // check if interrupt occurred for channel
    old  = pchregs->data.aint;
    mask = ((unsigned int) 1L) << (channel & 0x1f);

    if (!(old & mask))
        return;

    pvoice = &codec->synth.voices[channel];
    runtime = pvoice->substream->runtime;

    udelay(100);
    spin_lock(&codec->reg_lock);

    if (pvoice->pcm && pvoice->substream) {
        /* pcm interrupt */
#ifdef ALI_DEBUG
        outb((u8)(pvoice->number), ALI_REG(codec, ALI_GC_CIR));
        temp = inw(ALI_REG(codec, ALI_CSO_ALPHA_FMS + 2));
        cspf = (inl(ALI_REG(codec, ALI_CSPF)) & mask) == mask;
#endif
        if (pvoice->running) {
#ifndef TARGET_OS2
            snd_ali_printk("update_ptr: cso=%4.4x cspf=%d.\n",(u16)temp,cspf);
#endif
            spin_unlock(&codec->reg_lock);
            snd_pcm_period_elapsed(pvoice->substream);
            spin_lock(&codec->reg_lock);
        } else {
            snd_ali_stop_voice(codec, channel);
            snd_ali_disable_voice_irq(codec, channel);
        }
    } else if (codec->synth.voices[channel].synth) {
        /* synth interrupt */
    } else if (codec->synth.voices[channel].midi) {
        /* midi interrupt */
    } else {
        /* unknown interrupt */
        snd_ali_stop_voice(codec, channel);
        snd_ali_disable_voice_irq(codec, channel);
    }
    spin_unlock(&codec->reg_lock);
    outl(mask,ALI_REG(codec,pchregs->regs.aint));
    pchregs->data.aint = old & (~mask);
}

static void snd_ali_interrupt(ali_t * codec)
{
    int channel;
    unsigned int audio_int;
    snd_ali_channel_control_t *pchregs = NULL;
    pchregs = &(codec->chregs);

    audio_int = inl(ALI_REG(codec, ALI_MISCINT));
    if (audio_int & ADDRESS_IRQ) {
        // get interrupt status for all channels
        pchregs->data.aint = inl(ALI_REG(codec,pchregs->regs.aint));
        for (channel = 0; channel < ALI_CHANNELS; channel++) {
            snd_ali_update_ptr(codec, channel);
        }
    }
    outl((TARGET_REACHED | MIXER_OVERFLOW | MIXER_UNDERFLOW),
         ALI_REG(codec,ALI_MISCINT));
}


static irqreturn_t snd_ali_card_interrupt(int irq,
                                          void *dev_id,
                                          struct pt_regs *regs)
{
    ali_t   *codec = dev_id;
#ifdef TARGET_OS2
    int fOurIrq = FALSE;
#endif

    if (codec == NULL)
        return IRQ_NONE;
#ifdef TARGET_OS2
    fOurIrq = TRUE;
#endif
    snd_ali_interrupt(codec);
#ifdef TARGET_OS2
    if (fOurIrq) {
        eoi_irq(irq);
    }
#endif //TARGET_OS2

    return IRQ_HANDLED;
}


static snd_ali_voice_t *snd_ali_alloc_voice(ali_t * codec, int type, int rec)
{
    snd_ali_voice_t *pvoice = NULL;
    unsigned long flags;
    int idx;

    snd_ali_printk("alloc_voice: type=%d rec=%d\n",type,rec);

    spin_lock_irqsave(&codec->voice_alloc, flags);
    if (type == SNDRV_ALI_VOICE_TYPE_PCM) {
        idx = snd_ali_find_free_channel(codec,rec);
        if(idx < 0) {
            snd_printk("ali_alloc_voice: err.\n");
            spin_unlock_irqrestore(&codec->voice_alloc, flags);
            return NULL;
        }
        pvoice = &(codec->synth.voices[idx]);
        pvoice->use = 1;
        pvoice->pcm = 1;
        pvoice->mode = rec;
        spin_unlock_irqrestore(&codec->voice_alloc, flags);
        return pvoice;
    }
    spin_unlock_irqrestore(&codec->voice_alloc, flags);
    return NULL;
}


static void snd_ali_free_voice(ali_t * codec, snd_ali_voice_t *pvoice)
{
    unsigned long flags;
    void (*private_free)(void *);
    void *private_data;

    snd_ali_printk("free_voice: channel=%d\n",pvoice->number);
    if (pvoice == NULL || !pvoice->use)
        return;
    snd_ali_clear_voices(codec, pvoice->number, pvoice->number);
    spin_lock_irqsave(&codec->voice_alloc, flags);
    private_free = pvoice->private_free;
    private_data = pvoice->private_data;
    pvoice->private_free = NULL;
    pvoice->private_data = NULL;
    if (pvoice->pcm) {
        snd_ali_free_channel_pcm(codec, pvoice->number);
    }
    pvoice->use = pvoice->pcm = pvoice->synth = 0;
    pvoice->substream = NULL;
    spin_unlock_irqrestore(&codec->voice_alloc, flags);
    if (private_free)
        private_free(private_data);
}


static void snd_ali_clear_voices(ali_t * codec,
                                 unsigned int v_min,
                                 unsigned int v_max)
{
    unsigned int i;

    for (i = v_min; i <= v_max; i++) {
        snd_ali_stop_voice(codec, i);
        snd_ali_disable_voice_irq(codec, i);
    }
}

static void snd_ali_write_voice_regs(ali_t * codec,
                                     unsigned int Channel,
                                     unsigned int LBA,
                                     unsigned int CSO,
                                     unsigned int ESO,
                                     unsigned int DELTA,
                                     unsigned int ALPHA_FMS,
                                     unsigned int GVSEL,
                                     unsigned int PAN,
                                     unsigned int VOL,
                                     unsigned int CTRL,
                                     unsigned int EC)
{
    unsigned int ctlcmds[4];

    outb((unsigned char)(Channel & 0x001f),ALI_REG(codec,ALI_GC_CIR));

    ctlcmds[0] =  (CSO << 16) | (ALPHA_FMS & 0x0000ffff);
    ctlcmds[1] =  LBA;
    ctlcmds[2] =  (ESO << 16) | (DELTA & 0x0ffff);
    ctlcmds[3] =  (GVSEL << 31) |
        ((PAN & 0x0000007f) << 24) |
        ((VOL & 0x000000ff) << 16) |
        ((CTRL & 0x0000000f) << 12) |
        (EC & 0x00000fff);

    outb(Channel, ALI_REG(codec, ALI_GC_CIR));

    outl(ctlcmds[0], ALI_REG(codec,ALI_CSO_ALPHA_FMS));
    outl(ctlcmds[1], ALI_REG(codec,ALI_LBA));
    outl(ctlcmds[2], ALI_REG(codec,ALI_ESO_DELTA));
    outl(ctlcmds[3], ALI_REG(codec,ALI_GVSEL_PAN_VOC_CTRL_EC));

    outl(0x30000000, ALI_REG(codec, ALI_EBUF1));	/* Still Mode */
    outl(0x30000000, ALI_REG(codec, ALI_EBUF2));	/* Still Mode */
}

static unsigned int snd_ali_convert_rate(unsigned int rate, int rec)
{
    unsigned int delta;

    if (rate < 4000)  rate = 4000;
    if (rate > 48000) rate = 48000;

    if (rec) {
        if (rate == 44100)
            delta = 0x116a;
        else if (rate == 8000)
            delta = 0x6000;
        else if (rate == 48000)
            delta = 0x1000;
        else
            delta = ((48000 << 12) / rate) & 0x0000ffff;
    } else {
        if (rate == 44100)
            delta = 0xeb3;
        else if (rate == 8000)
            delta = 0x2ab;
        else if (rate == 48000)
            delta = 0x1000;
        else
            delta = (((rate << 12) + rate) / 48000) & 0x0000ffff;
    }

    return delta;
}

static unsigned int snd_ali_control_mode(snd_pcm_substream_t *substream)
{
    unsigned int CTRL;
    snd_pcm_runtime_t *runtime = substream->runtime;

    /* set ctrl mode
     CTRL default: 8-bit (unsigned) mono, loop mode enabled
     */
    CTRL = 0x00000001;
    if (snd_pcm_format_width(runtime->format) == 16)
        CTRL |= 0x00000008;	// 16-bit data
    if (!snd_pcm_format_unsigned(runtime->format))
        CTRL |= 0x00000002;	// signed data
    if (runtime->channels > 1)
        CTRL |= 0x00000004;	// stereo data
    return CTRL;
}

/*
 *  PCM part
 */

static int snd_ali_ioctl(snd_pcm_substream_t * substream,
                         unsigned int cmd, void *arg)
{
    return snd_pcm_lib_ioctl(substream, cmd, arg);
}

static int snd_ali_trigger(snd_pcm_substream_t *substream,
                           int cmd)

{
    ali_t *codec = snd_pcm_substream_chip(substream);
    struct list_head *pos;
    snd_pcm_substream_t *s;
    unsigned int what, whati, capture_flag;
    snd_ali_voice_t *pvoice = NULL, *evoice = NULL;
    unsigned int val;
    int do_start;

    switch (cmd) {
    case SNDRV_PCM_TRIGGER_START:
    case SNDRV_PCM_TRIGGER_RESUME:
        do_start = 1; break;
    case SNDRV_PCM_TRIGGER_STOP:
    case SNDRV_PCM_TRIGGER_SUSPEND:
        do_start = 0; break;
    default:
        return -EINVAL;
    }

    what = whati = capture_flag = 0;
    snd_pcm_group_for_each(pos, substream) {
        s = snd_pcm_group_substream_entry(pos);
        if ((ali_t *) snd_pcm_substream_chip(s) == codec) {
            pvoice = (snd_ali_voice_t *) s->runtime->private_data;
            evoice = pvoice->extra;
            what |= 1 << (pvoice->number & 0x1f);
            if (evoice == NULL) {
                whati |= 1 << (pvoice->number & 0x1f);
            } else {
                whati |= 1 << (evoice->number & 0x1f);
                what |= 1 << (evoice->number & 0x1f);
            }
            if (do_start) {
                pvoice->running = 1;
                if (evoice != NULL)
                    evoice->running = 1;
            } else {
                pvoice->running = 0;
                if (evoice != NULL)
                    evoice->running = 0;
            }
            snd_pcm_trigger_done(s, substream);
            if (pvoice->mode)
                capture_flag = 1;
        }
    }
    spin_lock(&codec->reg_lock);
    if (! do_start) {
        outl(what, ALI_REG(codec, ALI_STOP));
    }
    val = inl(ALI_REG(codec, ALI_AINTEN));
    if (do_start) {
        val |= whati;
    } else {
        val &= ~whati;
    }
    outl(val, ALI_REG(codec, ALI_AINTEN));
    if (do_start) {
        outl(what, ALI_REG(codec, ALI_START));
    }
    snd_ali_printk("trigger: what=%xh whati=%xh\n",what,whati);
    spin_unlock(&codec->reg_lock);

    return 0;
}

static int snd_ali_playback_hw_params(snd_pcm_substream_t * substream,
                                      snd_pcm_hw_params_t * hw_params)
{
    ali_t *codec = snd_pcm_substream_chip(substream);
    snd_pcm_runtime_t *runtime = substream->runtime;
    snd_ali_voice_t *pvoice = (snd_ali_voice_t *) runtime->private_data;
    snd_ali_voice_t *evoice = pvoice->extra;
    int err;
    err = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
    if (err < 0) return err;

    /* voice management */

    if (params_buffer_size(hw_params)/2 != params_period_size(hw_params)) {
        if (evoice == NULL) {
            evoice = snd_ali_alloc_voice(codec, SNDRV_ALI_VOICE_TYPE_PCM, 0);
            if (evoice == NULL)
                return -ENOMEM;
            pvoice->extra = evoice;
            evoice->substream = substream;
        }
    } else {
        if (evoice != NULL) {
            snd_ali_free_voice(codec, evoice);
            pvoice->extra = evoice = NULL;
        }
    }

    return 0;
}

static int snd_ali_playback_hw_free(snd_pcm_substream_t * substream)
{
    ali_t *codec = snd_pcm_substream_chip(substream);
    snd_pcm_runtime_t *runtime = substream->runtime;
    snd_ali_voice_t *pvoice = (snd_ali_voice_t *) runtime->private_data;
    snd_ali_voice_t *evoice = pvoice ? pvoice->extra : NULL;

    snd_pcm_lib_free_pages(substream);
    if (evoice != NULL) {
        snd_ali_free_voice(codec, evoice);
        pvoice->extra = NULL;
    }
    return 0;
}

static int snd_ali_capture_hw_params(snd_pcm_substream_t * substream,
                                     snd_pcm_hw_params_t * hw_params)
{
    return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
}

static int snd_ali_capture_hw_free(snd_pcm_substream_t * substream)
{
    return snd_pcm_lib_free_pages(substream);
}

static int snd_ali_playback_prepare(snd_pcm_substream_t * substream)
{
    ali_t *codec = snd_pcm_substream_chip(substream);
    snd_pcm_runtime_t *runtime = substream->runtime;
    snd_ali_voice_t *pvoice = (snd_ali_voice_t *) runtime->private_data;
    snd_ali_voice_t *evoice = pvoice->extra;
    unsigned long flags;

    unsigned int LBA;
    unsigned int Delta;
    unsigned int ESO;
    unsigned int CTRL;
    unsigned int GVSEL;
    unsigned int PAN;
    unsigned int VOL;
    unsigned int EC;

    snd_ali_printk("playback_prepare ...\n");

    spin_lock_irqsave(&codec->reg_lock, flags);

    /* set Delta (rate) value */
    Delta = snd_ali_convert_rate(runtime->rate, 0);

    if ((pvoice->number == ALI_SPDIF_IN_CHANNEL) ||
        (pvoice->number == ALI_PCM_IN_CHANNEL))
        snd_ali_disable_special_channel(codec, pvoice->number);
    else if (codec->spdif_support &&
             (inl(ALI_REG(codec, ALI_GLOBAL_CONTROL)) & ALI_SPDIF_OUT_CH_ENABLE)
             && (pvoice->number == ALI_SPDIF_OUT_CHANNEL)) {
        snd_ali_set_spdif_out_rate(codec, runtime->rate);
        Delta = 0x1000;
    }

    /* set Loop Back Address */
    LBA = runtime->dma_addr;

    /* set interrupt count size */
    pvoice->count = runtime->period_size;

    /* set target ESO for channel */
    pvoice->eso = runtime->buffer_size;

    snd_ali_printk("playback_prepare: eso=%xh count=%xh\n",pvoice->eso,pvoice->count);

    /* set ESO to capture first MIDLP interrupt */
    ESO = pvoice->eso -1;
    /* set ctrl mode */
    CTRL = snd_ali_control_mode(substream);

    GVSEL = 1;
    PAN = 0;
    VOL = 0;
    EC = 0;
    snd_ali_printk("playback_prepare:\n    ch=%d, Rate=%d Delta=%xh,GVSEL=%xh,PAN=%xh,CTRL=%xh\n",pvoice->number,runtime->rate,Delta,GVSEL,PAN,CTRL);
    snd_ali_write_voice_regs(    codec,
                             pvoice->number,
                             LBA,
                             0,	/* cso */
                             ESO,
                             Delta,
                             0,	/* alpha */
                             GVSEL,
                             PAN,
                             VOL,
                             CTRL,
                             EC);
    if (evoice != NULL) {
        evoice->count = pvoice->count;
        evoice->eso = pvoice->count << 1;
        ESO = evoice->eso - 1;
        snd_ali_write_voice_regs(codec,
                                 evoice->number,
                                 LBA,
                                 0,	/* cso */
                                 ESO,
                                 Delta,
                                 0,	/* alpha */
                                 GVSEL,
                                 (unsigned int)0x7f,
                                 (unsigned int)0x3ff,
                                 CTRL,
                                 EC);
    }
    spin_unlock_irqrestore(&codec->reg_lock, flags);
    return 0;
}


static int snd_ali_capture_prepare(snd_pcm_substream_t * substream)
{
    ali_t *codec = snd_pcm_substream_chip(substream);
    snd_pcm_runtime_t *runtime = substream->runtime;
    snd_ali_voice_t *pvoice = (snd_ali_voice_t *) runtime->private_data;
    unsigned long flags;
    unsigned int LBA;
    unsigned int Delta;
    unsigned int ESO;
    unsigned int CTRL;
    unsigned int GVSEL;
    unsigned int PAN;
    unsigned int VOL;
    unsigned int EC;
    u8	 bValue;

    spin_lock_irqsave(&codec->reg_lock, flags);

    snd_ali_printk("capture_prepare...\n");

    snd_ali_enable_special_channel(codec,pvoice->number);

    Delta = snd_ali_convert_rate(runtime->rate, 1);

    // Prepare capture intr channel
    if (pvoice->number == ALI_SPDIF_IN_CHANNEL) {

        unsigned int rate;

        if (codec->revision != ALI_5451_V02) {
            spin_unlock_irqrestore(&codec->reg_lock, flags);
            return -1;
        }
        rate = snd_ali_get_spdif_in_rate(codec);
        if (rate == 0) {
            snd_printk("ali_capture_preapre: spdif rate detect err!\n");
            rate = 48000;
        }
        bValue = inb(ALI_REG(codec,ALI_SPDIF_CTRL));
        if (bValue & 0x10) {
            outb(bValue,ALI_REG(codec,ALI_SPDIF_CTRL));
            printk("clear SPDIF parity error flag.\n");
        }

        if (rate != 48000)
            Delta = ((rate << 12)/runtime->rate)&0x00ffff;
    }

    // set target ESO for channel
    pvoice->eso = runtime->buffer_size;

    // set interrupt count size
    pvoice->count = runtime->period_size;

    // set Loop Back Address
    LBA = runtime->dma_addr;

    // set ESO to capture first MIDLP interrupt
    ESO = pvoice->eso - 1;
    CTRL = snd_ali_control_mode(substream);
    GVSEL = 0;
    PAN = 0x00;
    VOL = 0x00;
    EC = 0;

    snd_ali_write_voice_regs(    codec,
                             pvoice->number,
                             LBA,
                             0,	/* cso */
                             ESO,
                             Delta,
                             0,	/* alpha */
                             GVSEL,
                             PAN,
                             VOL,
                             CTRL,
                             EC);


    spin_unlock_irqrestore(&codec->reg_lock, flags);

    return 0;
}


static snd_pcm_uframes_t snd_ali_playback_pointer(snd_pcm_substream_t *substream)
{
    ali_t *codec = snd_pcm_substream_chip(substream);
    snd_pcm_runtime_t *runtime = substream->runtime;
    snd_ali_voice_t *pvoice = (snd_ali_voice_t *) runtime->private_data;
    unsigned int cso;

    spin_lock(&codec->reg_lock);
    if (!pvoice->running) {
        spin_unlock(&codec->reg_lock);
        return 0;
    }
    outb(pvoice->number, ALI_REG(codec, ALI_GC_CIR));
    cso = inw(ALI_REG(codec, ALI_CSO_ALPHA_FMS + 2));
    spin_unlock(&codec->reg_lock);
    snd_ali_printk("playback pointer returned cso=%xh.\n", cso);

    return cso;
}


static snd_pcm_uframes_t snd_ali_capture_pointer(snd_pcm_substream_t *substream)
{
    ali_t *codec = snd_pcm_substream_chip(substream);
    snd_pcm_runtime_t *runtime = substream->runtime;
    snd_ali_voice_t *pvoice = (snd_ali_voice_t *) runtime->private_data;
    unsigned int cso;
    unsigned long flags;

    spin_lock_irqsave(&codec->reg_lock, flags);
    if (!pvoice->running) {
        spin_unlock_irqrestore(&codec->reg_lock, flags);
        return 0;
    }
    outb(pvoice->number, ALI_REG(codec, ALI_GC_CIR));
    cso = inw(ALI_REG(codec, ALI_CSO_ALPHA_FMS + 2));
    spin_unlock_irqrestore(&codec->reg_lock, flags);

    return cso;
}

static snd_pcm_hardware_t snd_ali_playback =
{
    /*	info:		  */	(SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
                                 SNDRV_PCM_INFO_MMAP_VALID |
                                 SNDRV_PCM_INFO_RESUME |
                                 SNDRV_PCM_INFO_SYNC_START),
                                 /*	formats:	  */	(SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE |
                                                                 SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U16_LE),
                                                                 /*	rates:		  */	SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
                                                                 /*	rate_min:	  */	4000,
                                                                 /*	rate_max:	  */	48000,
                                                                 /*	channels_min:	  */	1,
                                                                 /*	channels_max:	  */	2,
                                                                 /*	buffer_bytes_max:  */	(256*1024),
                                                                 /*	period_bytes_min:  */	64,
                                                                 /*	period_bytes_max:  */	(256*1024),
                                                                 /*	periods_min:	  */	1,
                                                                 /*	periods_max:	  */	1024,
                                                                 /*	fifo_size:	  */	0,
};

/*
 *  Capture support device description
 */

static snd_pcm_hardware_t snd_ali_capture =
{
    /*	info:		  */	(SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
                                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
                                 SNDRV_PCM_INFO_MMAP_VALID |
                                 SNDRV_PCM_INFO_RESUME |
                                 SNDRV_PCM_INFO_SYNC_START),
                                 /*	formats:	  */	(SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE |
                                                                 SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U16_LE),
                                                                 /*	rates:		  */	SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
                                                                 /*	rate_min:	  */	4000,
                                                                 /*	rate_max:	  */	48000,
                                                                 /*	channels_min:	  */	1,
                                                                 /*	channels_max:	  */	2,
                                                                 /*	buffer_bytes_max:  */	(128*1024),
                                                                 /*	period_bytes_min:  */	64,
                                                                 /*	period_bytes_max:  */	(128*1024),
                                                                 /*	periods_min:	  */	1,
                                                                 /*	periods_max:	  */	1024,
                                                                 /*	fifo_size:	  */	0,
};

static void snd_ali_pcm_free_substream(snd_pcm_runtime_t *runtime)
{
    unsigned long flags;
    snd_ali_voice_t *pvoice = (snd_ali_voice_t *) runtime->private_data;
    ali_t *codec;

    if (pvoice) {
        codec = pvoice->codec;
        spin_lock_irqsave(&codec->reg_lock, flags);
        snd_ali_free_voice(pvoice->codec, pvoice);
        spin_unlock_irqrestore(&codec->reg_lock, flags);
    }
}

static int snd_ali_playback_open(snd_pcm_substream_t * substream)
{
    ali_t *codec = snd_pcm_substream_chip(substream);
    snd_pcm_runtime_t *runtime = substream->runtime;
    snd_ali_voice_t *pvoice;
    unsigned long flags = 0;

    spin_lock_irqsave(&codec->reg_lock, flags);
    pvoice = snd_ali_alloc_voice(codec, SNDRV_ALI_VOICE_TYPE_PCM, 0);
    if (pvoice == NULL) {
        spin_unlock_irqrestore(&codec->reg_lock, flags);
        return -EAGAIN;
    }
    pvoice->codec = codec;
    spin_unlock_irqrestore(&codec->reg_lock, flags);

    pvoice->substream = substream;
    runtime->private_data = pvoice;
    runtime->private_free = snd_ali_pcm_free_substream;

    runtime->hw = snd_ali_playback;
    snd_pcm_set_sync(substream);
    snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 0, 64*1024);
    return 0;
}


static int snd_ali_capture_open(snd_pcm_substream_t * substream)
{
    ali_t *codec = snd_pcm_substream_chip(substream);
    snd_pcm_runtime_t *runtime = substream->runtime;
    snd_ali_voice_t *pvoice;
    unsigned long flags;

    spin_lock_irqsave(&codec->reg_lock, flags);
    pvoice = snd_ali_alloc_voice(codec, SNDRV_ALI_VOICE_TYPE_PCM, 1);
    if (pvoice == NULL) {
        spin_unlock_irqrestore(&codec->reg_lock, flags);
        return -EAGAIN;
    }
    pvoice->codec = codec;
    spin_unlock_irqrestore(&codec->reg_lock, flags);

    pvoice->substream = substream;
    runtime->private_data = pvoice;
    runtime->private_free = snd_ali_pcm_free_substream;
    runtime->hw = snd_ali_capture;
    snd_pcm_set_sync(substream);
    snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 0, 64*1024);
    return 0;
}


static int snd_ali_playback_close(snd_pcm_substream_t * substream)
{
    return 0;
}

static int snd_ali_capture_close(snd_pcm_substream_t * substream)
{
    ali_t *codec = snd_pcm_substream_chip(substream);
    snd_pcm_runtime_t *runtime = substream->runtime;
    snd_ali_voice_t *pvoice = (snd_ali_voice_t *) runtime->private_data;

    snd_ali_disable_special_channel(codec,pvoice->number);

    return 0;
}

#ifdef TARGET_OS2
static snd_pcm_ops_t snd_ali_playback_ops = {
    snd_ali_playback_open,
    snd_ali_playback_close,
    snd_ali_ioctl,
    snd_ali_playback_hw_params,
    snd_ali_playback_hw_free,
    snd_ali_playback_prepare,
    snd_ali_trigger,
    snd_ali_playback_pointer,0,0
};

static snd_pcm_ops_t snd_ali_capture_ops = {
    snd_ali_capture_open,
    snd_ali_capture_close,
    snd_ali_ioctl,
    snd_ali_capture_hw_params,
    snd_ali_capture_hw_free,
    snd_ali_capture_prepare,
    snd_ali_trigger,
    snd_ali_capture_pointer,0,0
};
#else
static snd_pcm_ops_t snd_ali_playback_ops = {
open:		snd_ali_playback_open,
    close:		snd_ali_playback_close,
    ioctl:		snd_ali_ioctl,
    hw_params:	snd_ali_playback_hw_params,
    hw_free:	snd_ali_playback_hw_free,
    prepare:	snd_ali_playback_prepare,
    trigger:	snd_ali_trigger,
    pointer:	snd_ali_playback_pointer,
};

static snd_pcm_ops_t snd_ali_capture_ops = {
open:		snd_ali_capture_open,
    close:		snd_ali_capture_close,
    ioctl:		snd_ali_ioctl,
    hw_params:	snd_ali_capture_hw_params,
    hw_free:	snd_ali_capture_hw_free,
    prepare:	snd_ali_capture_prepare,
    trigger:	snd_ali_trigger,
    pointer:	snd_ali_capture_pointer,
};
#endif

static void snd_ali_pcm_free(snd_pcm_t *pcm)
{
    ali_t *codec = pcm->private_data;
    codec->pcm = NULL;
}

static int __devinit snd_ali_pcm(ali_t * codec, int device, snd_pcm_t ** rpcm)
{
	snd_pcm_t *pcm;
	int err;

	if (rpcm) *rpcm = NULL;
	err = snd_pcm_new(codec->card, "ALI 5451", device, ALI_CHANNELS, 1, &pcm);
	if (err < 0) {
		snd_printk("snd_ali_pcm: err called snd_pcm_new.\n");
		return err;
	}
	pcm->private_data = codec;
	pcm->private_free = snd_ali_pcm_free;
	pcm->info_flags = 0;
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_ali_playback_ops);
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_ali_capture_ops);

	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
					      snd_dma_pci_data(codec->pci), 64*1024, 128*1024);

	pcm->info_flags = 0;
	pcm->dev_subclass = SNDRV_PCM_SUBCLASS_GENERIC_MIX;
	strcpy(pcm->name, "ALI 5451");
	codec->pcm = pcm;
	if (rpcm) *rpcm = pcm;
	return 0;
}


#ifdef TARGET_OS2
#define ALI5451_SPDIF(xname, xindex, value) \
    { SNDRV_CTL_ELEM_IFACE_MIXER, 0,0, xname, xindex,\
    0, 0, snd_ali5451_spdif_info, snd_ali5451_spdif_get, \
    snd_ali5451_spdif_put, 0, value}
#else
#define ALI5451_SPDIF(xname, xindex, value) \
    { iface: SNDRV_CTL_ELEM_IFACE_MIXER, name: xname, index: xindex,\
    info: snd_ali5451_spdif_info, get: snd_ali5451_spdif_get, \
    put: snd_ali5451_spdif_put, private_value: value}
#endif

static int snd_ali5451_spdif_info(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t *uinfo)
{
    uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
    uinfo->count = 1;
    uinfo->value.integer.min = 0;
    uinfo->value.integer.max = 1;
    return 0;
}

static int snd_ali5451_spdif_get(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
{
    unsigned long flags;
    ali_t *codec = kcontrol->private_data;
    unsigned int enable;

    enable = ucontrol->value.integer.value[0] ? 1 : 0;

    spin_lock_irqsave(&codec->reg_lock, flags);
    switch(kcontrol->private_value) {
    case 0:
        enable = (codec->spdif_mask & 0x02) ? 1 : 0;
        break;
    case 1:
        enable = ((codec->spdif_mask & 0x02) && (codec->spdif_mask & 0x04)) ? 1 : 0;
        break;
    case 2:
        enable = (codec->spdif_mask & 0x01) ? 1 : 0;
        break;
    default:
        break;
    }
    ucontrol->value.integer.value[0] = enable;
    spin_unlock_irqrestore(&codec->reg_lock, flags);
    return 0;
}

static int snd_ali5451_spdif_put(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
{
    unsigned long flags;
    ali_t *codec = kcontrol->private_data;
    unsigned int change = 0, enable = 0;

    enable = ucontrol->value.integer.value[0] ? 1 : 0;

    spin_lock_irqsave(&codec->reg_lock, flags);
    switch (kcontrol->private_value) {
    case 0:
        change = (codec->spdif_mask & 0x02) ? 1 : 0;
        change = change ^ enable;
        if (change) {
            if (enable) {
                codec->spdif_mask |= 0x02;
                snd_ali_enable_spdif_out(codec);
            } else {
                codec->spdif_mask &= ~(0x02);
                codec->spdif_mask &= ~(0x04);
                snd_ali_disable_spdif_out(codec);
            }
        }
        break;
    case 1:
        change = (codec->spdif_mask & 0x04) ? 1 : 0;
        change = change ^ enable;
        if (change && (codec->spdif_mask & 0x02)) {
            if (enable) {
                codec->spdif_mask |= 0x04;
                snd_ali_enable_spdif_chnout(codec);
            } else {
                codec->spdif_mask &= ~(0x04);
                snd_ali_disable_spdif_chnout(codec);
            }
        }
        break;
    case 2:
        change = (codec->spdif_mask & 0x01) ? 1 : 0;
        change = change ^ enable;
        if (change) {
            if (enable) {
                codec->spdif_mask |= 0x01;
                snd_ali_enable_spdif_in(codec);
            } else {
                codec->spdif_mask &= ~(0x01);
                snd_ali_disable_spdif_in(codec);
            }
        }
        break;
    default:
        break;
    }
    spin_unlock_irqrestore(&codec->reg_lock, flags);

    return change;
}

static snd_kcontrol_new_t snd_ali5451_mixer_spdif[] __devinitdata = {
    ALI5451_SPDIF("S/PDIF Out", 0, 0),
    ALI5451_SPDIF("S/PDIF Out to S/PDIF Channel",0, 1),
    ALI5451_SPDIF("S/PDIF In from S/PDIF Channel",0, 2) };

static void snd_ali_mixer_free_ac97_bus(ac97_bus_t *bus)
{
    ali_t *codec = bus->private_data;
    codec->ac97_bus = NULL;
}

static void snd_ali_mixer_free_ac97(ac97_t *ac97)
{
    ali_t *codec = ac97->private_data;
    codec->ac97 = NULL;
}

static int __devinit snd_ali_mixer(ali_t * codec)
{
    ac97_template_t ac97;
    unsigned int idx;
    int err;
    static ac97_bus_ops_t ops = {
        0,0,
	snd_ali_codec_write,
        snd_ali_codec_read,0,0
    };

    if ((err = snd_ac97_bus(codec->card, 0, &ops, codec, &codec->ac97_bus)) < 0)
        return err;
    codec->ac97_bus->private_free = snd_ali_mixer_free_ac97_bus;

    memset(&ac97, 0, sizeof(ac97));
    ac97.private_data = codec;
    ac97.private_free = snd_ali_mixer_free_ac97;
    if ((err = snd_ac97_mixer(codec->ac97_bus, &ac97, &codec->ac97)) < 0) {
        snd_printk("ali mixer creating error.\n");
        return err;
    }
    if (codec->spdif_support) {
        for(idx = 0; idx < ARRAY_SIZE(snd_ali5451_mixer_spdif); idx++) {
            err=snd_ctl_add(codec->card, snd_ctl_new1(&snd_ali5451_mixer_spdif[idx], codec));
            if (err < 0) return err;
        }
    }
    return 0;
}

#ifdef CONFIG_PM
static int ali_suspend(snd_card_t *card, unsigned int state)
{
    ali_t *chip = card->pm_private_data;
    ali_image_t *im;
    int i, j;

    im = chip->image;
    if (! im)
        return 0;

    snd_pcm_suspend_all(chip->pcm);
    snd_ac97_suspend(chip->ac97);

    spin_lock_irq(&chip->reg_lock);

    im->regs[ALI_MISCINT >> 2] = inl(ALI_REG(chip, ALI_MISCINT));
    // im->regs[ALI_START >> 2] = inl(ALI_REG(chip, ALI_START));
    im->regs[ALI_STOP >> 2] = inl(ALI_REG(chip, ALI_STOP));

    // disable all IRQ bits
    outl(0, ALI_REG(chip, ALI_MISCINT));

    for (i = 0; i < ALI_GLOBAL_REGS; i++) {
        if ((i*4 == ALI_MISCINT) || (i*4 == ALI_STOP))
            continue;
        im->regs[i] = inl(ALI_REG(chip, i*4));
    }

    for (i = 0; i < ALI_CHANNELS; i++) {
        outb(i, ALI_REG(chip, ALI_GC_CIR));
        for (j = 0; j < ALI_CHANNEL_REGS; j++)
            im->channel_regs[i][j] = inl(ALI_REG(chip, j*4 + 0xe0));
    }

    // stop all HW channel
    outl(0xffffffff, ALI_REG(chip, ALI_STOP));

    spin_unlock_irq(&chip->reg_lock);
    return 0;
}

static int ali_resume(snd_card_t *card, unsigned int state)
{
    ali_t *chip = card->pm_private_data;
    ali_image_t *im;
    int i, j;

    im = chip->image;
    if (! im)
        return 0;

    pci_enable_device(chip->pci);

    spin_lock_irq(&chip->reg_lock);

    for (i = 0; i < ALI_CHANNELS; i++) {
        outb(i, ALI_REG(chip, ALI_GC_CIR));
        for (j = 0; j < ALI_CHANNEL_REGS; j++)
            outl(im->channel_regs[i][j], ALI_REG(chip, j*4 + 0xe0));
    }

    for (i = 0; i < ALI_GLOBAL_REGS; i++) {
        if ((i*4 == ALI_MISCINT) || (i*4 == ALI_STOP) || (i*4 == ALI_START))
            continue;
        outl(im->regs[i], ALI_REG(chip, i*4));
    }

    // start HW channel
    outl(im->regs[ALI_START >> 2], ALI_REG(chip, ALI_START));
    // restore IRQ enable bits
    outl(im->regs[ALI_MISCINT >> 2], ALI_REG(chip, ALI_MISCINT));

    spin_unlock_irq(&chip->reg_lock);

    snd_ac97_resume(chip->ac97);
    return 0;
}
#endif /* CONFIG_PM */

static int snd_ali_free(ali_t * codec)
{
    if (codec->hw_initialized)
        snd_ali_disable_address_interrupt(codec);
    // if (codec->irq >= 0) {	// 12 Jun 07 SHL avoid warning
        synchronize_irq(codec->irq);
        free_irq(codec->irq, (void *)codec);
    // }	// 12 Jun 07 SHL
    if (codec->port)
        pci_release_regions(codec->pci);
#ifdef CONFIG_PM
    if (codec->image)
        kfree(codec->image);
#endif
    kfree(codec);
    return 0;
}

static int snd_ali_chip_init(ali_t *codec)
{
    unsigned int legacy;
    unsigned char temp;
    struct pci_dev *pci_dev = NULL;

    snd_ali_printk("chip initializing ... \n");

    if (snd_ali_reset_5451(codec)) {
        snd_printk("ali_chip_init: reset 5451 error.\n");
        return -1;
    }

    if (codec->revision == ALI_5451_V02) {
        pci_dev = codec->pci_m1533;
        pci_read_config_byte(pci_dev, 0x59, &temp);
        temp |= 0x80;
        pci_write_config_byte(pci_dev, 0x59, temp);

        pci_dev = codec->pci_m7101;
        pci_read_config_byte(pci_dev,0xb8,&temp);
        temp |= 0x20;
        pci_write_config_byte(pci_dev, 0xB8, temp);
    }

    pci_read_config_dword(codec->pci, 0x44, &legacy);
    legacy &= 0xff00ff00;
    legacy |= 0x000800aa;
    pci_write_config_dword(codec->pci, 0x44, legacy);

    outl(0x80000001, ALI_REG(codec, ALI_GLOBAL_CONTROL));
    outl(0x00000000, ALI_REG(codec, ALI_AINTEN));
    outl(0xffffffff, ALI_REG(codec, ALI_AINT));
    outl(0x00000000, ALI_REG(codec, ALI_VOLUME));
    outb(0x10, 	 ALI_REG(codec, ALI_MPUR2));

    codec->ac97_ext_id = snd_ali_codec_peek(codec, 0, AC97_EXTENDED_ID);
    codec->ac97_ext_status = snd_ali_codec_peek(codec, 0, AC97_EXTENDED_STATUS);
    if (codec->spdif_support) {
        snd_ali_enable_spdif_out(codec);
        codec->spdif_mask = 0x00000002;
    }

    snd_ali_printk("chip initialize succeed.\n");
    return 0;

}

static int __devinit snd_ali_resources(ali_t *codec)
{
    int err;

    snd_ali_printk("resouces allocation ...\n");
    if ((err = pci_request_regions(codec->pci, "ALI 5451")) < 0)
        return err;
    codec->port = pci_resource_start(codec->pci, 0);

    if (request_irq(codec->pci->irq, snd_ali_card_interrupt, SA_INTERRUPT|SA_SHIRQ, "ALI 5451", (void *)codec)) {
        snd_printk("Unable to request irq.\n");
        return -EBUSY;
    }
    codec->irq = codec->pci->irq;
    snd_ali_printk("resouces allocated.\n");
    return 0;
}
static int snd_ali_dev_free(snd_device_t *device)
{
    ali_t *codec=device->device_data;
    snd_ali_free(codec);
    return 0;
}

static int __devinit snd_ali_create(snd_card_t * card,
                                    struct pci_dev *pci,
                                    int pcm_streams,
                                    int spdif_support,
                                    ali_t ** r_ali)
{
    ali_t *codec;
    int i, err;
    unsigned short cmdw = 0;
    struct pci_dev *pci_dev = NULL;
    static struct snd_device_ops ops = {
        .dev_free = snd_ali_dev_free,
    };

    *r_ali = NULL;

    snd_ali_printk("creating ...\n");

    /* enable PCI device */
    if ((err = pci_enable_device(pci)) < 0)
        return err;
    /* check, if we can restrict PCI DMA transfers to 31 bits */
    if (!pci_dma_supported(pci, 0x7fffffff)) {
        snd_printk("architecture does not support 31bit PCI busmaster DMA\n");
        return -ENXIO;
    }
    pci_set_dma_mask(pci, 0x7fffffff);

    if ((codec = kcalloc(1, sizeof(*codec), GFP_KERNEL)) == NULL)
        return -ENOMEM;

    spin_lock_init(&codec->reg_lock);
    spin_lock_init(&codec->voice_alloc);

    codec->card = card;
    codec->pci = pci;
    codec->irq = -1;
    pci_read_config_byte(pci, PCI_REVISION_ID, &codec->revision);
    codec->spdif_support = spdif_support;

    if (pcm_streams < 1)
        pcm_streams = 1;
    if (pcm_streams > 32)
        pcm_streams = 32;

    pci_set_master(pci);
    pci_read_config_word(pci, PCI_COMMAND, &cmdw);
    if ((cmdw & PCI_COMMAND_IO) != PCI_COMMAND_IO) {
        cmdw |= PCI_COMMAND_IO;
        pci_write_config_word(pci, PCI_COMMAND, cmdw);
    }
    pci_set_master(pci);

    if (snd_ali_resources(codec)) {
        snd_ali_free(codec);
        return -EBUSY;
    }

    synchronize_irq(pci->irq);

    codec->synth.chmap = 0;
    codec->synth.chcnt = 0;
    codec->spdif_mask = 0;
    codec->synth.synthcount = 0;

    if (codec->revision == ALI_5451_V02)
        codec->chregs.regs.ac97read = ALI_AC97_WRITE;
    else
        codec->chregs.regs.ac97read = ALI_AC97_READ;
    codec->chregs.regs.ac97write = ALI_AC97_WRITE;

    codec->chregs.regs.start  = ALI_START;
    codec->chregs.regs.stop   = ALI_STOP;
    codec->chregs.regs.aint   = ALI_AINT;
    codec->chregs.regs.ainten = ALI_AINTEN;

    codec->chregs.data.start  = 0x00;
    codec->chregs.data.stop   = 0x00;
    codec->chregs.data.aint   = 0x00;
    codec->chregs.data.ainten = 0x00;

    /* M1533: southbridge */
    pci_dev = pci_find_device(0x10b9, 0x1533, NULL);
    codec->pci_m1533 = pci_dev;
    if (! codec->pci_m1533) {
        snd_printk(KERN_ERR "ali5451: cannot find ALi 1533 chip.\n");
        snd_ali_free(codec);
        return -ENODEV;
    }
    /* M7101: power management */
    pci_dev = pci_find_device(0x10b9, 0x7101, NULL);
    codec->pci_m7101 = pci_dev;
    if (! codec->pci_m7101 && codec->revision == ALI_5451_V02) {
        snd_printk(KERN_ERR "ali5451: cannot find ALi 7101 chip.\n");
        snd_ali_free(codec);
        return -ENODEV;
    }

    snd_ali_printk("snd_device_new is called.\n");
    if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, codec, &ops)) < 0) {
        snd_ali_free(codec);
        return err;
    }

    /* initialise synth voices*/
    for (i = 0; i < ALI_CHANNELS; i++ ) {
        codec->synth.voices[i].number = i;
    }

    if ((err = snd_ali_chip_init(codec)) < 0) {
        snd_printk("ali create: chip init error.\n");
        return err;
    }

#ifdef CONFIG_PM
    codec->image = kmalloc(sizeof(*codec->image), GFP_KERNEL);
    if (! codec->image)
        snd_printk("can't allocate apm buffer\n");
    else
        snd_card_set_pm_callback(card, ali_suspend, ali_resume, codec);
#endif

    snd_ali_enable_address_interrupt(codec);
    codec->hw_initialized = 1;

    *r_ali = codec;
    snd_ali_printk("created.\n");
    return 0;
}

static int __devinit snd_ali_probe(struct pci_dev *pci,
                                   const struct pci_device_id *pci_id)
{
    static int dev;
    snd_card_t *card;
    ali_t *codec;
    int err;

    snd_ali_printk("probe ...\n");

    if (dev >= SNDRV_CARDS)
        return -ENODEV;
    if (!enable[dev]) {
        dev++;
        return -ENOENT;
    }

    card = snd_card_new(index[dev], id[dev], THIS_MODULE, 0);
    if (card == NULL)
        return -ENOMEM;

    if ((err = snd_ali_create(card, pci, pcm_channels[dev], spdif[dev], &codec)) < 0) {
        snd_card_free(card);
        return err;
    }

    snd_ali_printk("mixer building ...\n");
    if ((err = snd_ali_mixer(codec)) < 0) {
        snd_card_free(card);
        return err;
    }

    snd_ali_printk("pcm building ...\n");
    if ((err = snd_ali_pcm(codec, 0, NULL)) < 0) {
        snd_card_free(card);
        return err;
    }

    strcpy(card->driver, "ALI5451");
    strcpy(card->shortname, "ALI 5451");

    sprintf(card->longname, "%s at 0x%lx, irq %li",
            card->shortname, codec->port, codec->irq);

    snd_ali_printk("register card.\n");
    if ((err = snd_card_register(card)) < 0) {
        snd_card_free(card);
        return err;
    }
    pci_set_drvdata(pci, card);
    dev++;
    return 0;
}

static void __devexit snd_ali_remove(struct pci_dev *pci)
{
    snd_card_free(pci_get_drvdata(pci));
    pci_set_drvdata(pci, NULL);
}

static struct pci_driver driver = {
    0,0,0,"ALI 5451",
    snd_ali_ids,
    snd_ali_probe,
    snd_ali_remove,
    SND_PCI_PM_CALLBACKS
};

static int __init alsa_card_ali_init(void)
{
    int err;

    if ((err = pci_module_init(&driver)) < 0) {
#ifdef MODULE
        //		snd_printk("ALi pci audio not found or device busy.\n");
#endif
        return err;
    }
    return 0;
}

static void __exit alsa_card_ali_exit(void)
{
    pci_unregister_driver(&driver);
}

module_init(alsa_card_ali_init)
module_exit(alsa_card_ali_exit)

#ifndef MODULE

/* format is: snd-ali5451=enable,index,id,pcm_channels */

static int __init alsa_card_ali_setup(char *str)
{
    static unsigned __initdata nr_dev = 0;

    if (nr_dev >= SNDRV_CARDS)
        return 0;
    (void)(get_option(&str,&enable[nr_dev]) == 2 &&
           get_option(&str,&index[nr_dev]) == 2 &&
           get_id(&str,&id[nr_dev]) == 2 &&
           get_option(&str,&pcm_channels[nr_dev]) == 2);
    nr_dev++;
    return 1;
}

__setup("snd-ali5451=", alsa_card_ali_setup);

#endif /* ifndef */
