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ali5451.c

/*
 *  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
 *
 */

#include <sound/driver.h>
#include <asm/io.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/moduleparam.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/info.h>
#include <sound/ac97_codec.h>
#include <sound/mpu401.h>
#include <sound/initval.h>

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

static int index = SNDRV_DEFAULT_IDX1;    /* Index */
static char *id = SNDRV_DEFAULT_STR1;     /* ID for this card */
static int pcm_channels = 32;
static int spdif = 0;

module_param(index, int, 0444);
MODULE_PARM_DESC(index, "Index value for ALI M5451 PCI Audio.");
module_param(id, charp, 0444);
MODULE_PARM_DESC(id, "ID string for ALI M5451 PCI Audio.");
module_param(pcm_channels, int, 0444);
MODULE_PARM_DESC(pcm_channels, "PCM Channels");
module_param(spdif, bool, 0444);
MODULE_PARM_DESC(spdif, "Support SPDIF I/O");

/* just for backward compatibility */
static int enable;
module_param(enable, bool, 0444);


/*
 *  Debug part definitions
 */

//#define ALI_DEBUG

#ifdef ALI_DEBUG
#define snd_ali_printk(format, args...) printk(format, ##args);
#else
#define snd_ali_printk(format, args...)
#endif

/*
 *  Constants definition
 */

#define DEVICE_ID_ALI5451     ((PCI_VENDOR_ID_AL<<16)|PCI_DEVICE_ID_AL_M5451)


#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 ALI_MODEM_IN_CHANNEL    21
#define ALI_MODEM_OUT_CHANNEL   20

#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_SCTRL_LINE_IN2        (1 << 9)
#define   ALI_SCTRL_GPIO_IN2        (1 << 13)
#define   ALI_SCTRL_LINE_OUT_EN     (1 << 20)
#define   ALI_SCTRL_GPIO_OUT_EN     (1 << 23)
#define   ALI_SCTRL_CODEC1_READY    (1 << 24)
#define   ALI_SCTRL_CODEC2_READY    (1 << 25)
#define ALI_AC97_GPIO         0x4c
#define   ALI_AC97_GPIO_ENABLE            0x8000
#define   ALI_AC97_GPIO_DATA_SHIFT  16
#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 GPIO_IRQ        0x01000000
#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)

#define MAX_CODECS 2


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;
      unsigned 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;
      
      unsigned 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[MAX_CODECS];
      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;

      unsigned int num_of_codecs;

      ac97_bus_t *ac97_bus;
      ac97_t *ac97[MAX_CODECS];
      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;
      int i,j;

      pci_dev = pci_get_device(vendor, deviceid, NULL);
      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");
      }
      pci_dev_put(pci_dev);
 }
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 )
{
      unsigned long end_time;
      unsigned int res;
      
      end_time = jiffies + msecs_to_jiffies(250);
      do {
            res = snd_ali_5451_peek(codec,port);
            if (! (res & 0x8000))
                  return 0;
            schedule_timeout_uninterruptible(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)
{
      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 + msecs_to_jiffies(250);
      do {
            dwChk2 = snd_ali_5451_peek(codec, ALI_STIMER);
            if (dwChk2 != dwChk1)
                  return 0;
            schedule_timeout_uninterruptible(1);
      } while (time_after_eq(end_time, jiffies));
      snd_printk(KERN_ERR "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(KERN_ERR "ali_codec_poke: reg(%xh) invalid.\n", reg);
            return;
      }

      port = codec->chregs.regs.ac97write;

      if (snd_ali_codec_ready(codec, port) < 0)
            return;
      if (snd_ali_stimer_ready(codec) < 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(KERN_ERR "ali_codec_peek: reg(%xh) invalid.\n", reg);
            return ~0;
      }

      port = codec->chregs.regs.ac97read;

      if (snd_ali_codec_ready(codec, port) < 0)
            return ~0;
      if (snd_ali_stimer_ready(codec) < 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)
            return ~0;
      if (snd_ali_codec_ready(codec, port) < 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);
      if(reg == AC97_GPIO_STATUS) {
            outl((val << ALI_AC97_GPIO_DATA_SHIFT)|ALI_AC97_GPIO_ENABLE,
                  ALI_REG(codec, ALI_AC97_GPIO));
            return;
      }
      snd_ali_codec_poke(codec, ac97->num, 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, ac97->num, 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(KERN_ERR "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(KERN_ERR "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(KERN_ERR "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(KERN_ERR "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(KERN_ERR "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) < 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(KERN_ERR "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(KERN_ERR "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) {
                  snd_ali_printk("update_ptr: cso=%4.4x cspf=%d.\n",(u16)temp,cspf);
                  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;

      if (codec == NULL)
            return IRQ_NONE;
      snd_ali_interrupt(codec);
      return IRQ_HANDLED;
}


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

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

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


static void snd_ali_free_voice(ali_t * codec, snd_ali_voice_t *pvoice)
{
      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_irq(&codec->voice_alloc);
      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_irq(&codec->voice_alloc);
      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, -1);
                  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_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_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 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_irq(&codec->reg_lock);    
      
      /* 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_irq(&codec->reg_lock);
      return 0;
}


static int snd_ali_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 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_irq(&codec->reg_lock);

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

      snd_ali_enable_special_channel(codec,pvoice->number);

      Delta = (pvoice->number == ALI_MODEM_IN_CHANNEL ||
             pvoice->number == ALI_MODEM_OUT_CHANNEL) ? 
            0x1000 : snd_ali_convert_rate(runtime->rate, pvoice->mode);

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

            unsigned int rate;
            
            spin_unlock_irq(&codec->reg_lock);
            if (codec->revision != ALI_5451_V02)
                  return -1;

            rate = snd_ali_get_spdif_in_rate(codec);
            if (rate == 0) {
                  snd_printk(KERN_WARNING "ali_capture_preapre: spdif rate detect err!\n");
                  rate = 48000;
            }
            spin_lock_irq(&codec->reg_lock);
            bValue = inb(ALI_REG(codec,ALI_SPDIF_CTRL));
            if (bValue & 0x10) {
                  outb(bValue,ALI_REG(codec,ALI_SPDIF_CTRL));
                  printk(KERN_WARNING "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_irq(&codec->reg_lock);

      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_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_irq(&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);

      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)
{
      snd_ali_voice_t *pvoice = (snd_ali_voice_t *) runtime->private_data;
      ali_t *codec;

      if (pvoice) {
            codec = pvoice->codec;
            snd_ali_free_voice(pvoice->codec, pvoice);
      }
}

static int snd_ali_open(snd_pcm_substream_t * substream, int rec, int channel,
            snd_pcm_hardware_t *phw)
{
      ali_t *codec = snd_pcm_substream_chip(substream);
      snd_pcm_runtime_t *runtime = substream->runtime;
      snd_ali_voice_t *pvoice;

      pvoice = snd_ali_alloc_voice(codec, SNDRV_ALI_VOICE_TYPE_PCM, rec, channel);
      if (pvoice == NULL)
            return -EAGAIN;

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

      runtime->hw = *phw;
      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_open(snd_pcm_substream_t * substream)
{
      return snd_ali_open(substream, 0, -1, &snd_ali_playback);
}

static int snd_ali_capture_open(snd_pcm_substream_t * substream)
{
      return snd_ali_open(substream, 1, -1, &snd_ali_capture);
}

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

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

      snd_ali_disable_special_channel(codec,pvoice->number);

      return 0;
}

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_close,
      .ioctl =    snd_ali_ioctl,
      .hw_params =      snd_ali_hw_params,
      .hw_free =  snd_ali_hw_free,
      .prepare =  snd_ali_prepare,
      .trigger =  snd_ali_trigger,
      .pointer =  snd_ali_pointer,
};

/*
 * Modem PCM
 */

static int snd_ali_modem_hw_params(snd_pcm_substream_t * substream,
                         snd_pcm_hw_params_t * hw_params)
{
      ali_t *chip = snd_pcm_substream_chip(substream);
      unsigned int modem_num = chip->num_of_codecs - 1;
      snd_ac97_write(chip->ac97[modem_num], AC97_LINE1_RATE, params_rate(hw_params));
      snd_ac97_write(chip->ac97[modem_num], AC97_LINE1_LEVEL, 0);
      return snd_ali_hw_params(substream, hw_params);
}

static snd_pcm_hardware_t snd_ali_modem =
{
      .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_S16_LE,
      .rates =          SNDRV_PCM_RATE_KNOT|SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_16000,
      .rate_min =       8000,
      .rate_max =       16000,
      .channels_min =         1,
      .channels_max =         1,
      .buffer_bytes_max =     (256*1024),
      .period_bytes_min =     64,
      .period_bytes_max =     (256*1024),
      .periods_min =          1,
      .periods_max =          1024,
      .fifo_size =            0,
};

static int snd_ali_modem_open(snd_pcm_substream_t * substream, int rec, int channel)
{
      static unsigned int rates [] = {8000,9600,12000,16000};
      static snd_pcm_hw_constraint_list_t hw_constraint_rates = {
            .count = ARRAY_SIZE(rates),
            .list = rates,
            .mask = 0,
      };
      int err = snd_ali_open(substream, rec, channel, &snd_ali_modem);
      if (err)
            return err;
      return snd_pcm_hw_constraint_list(substream->runtime, 0,
                  SNDRV_PCM_HW_PARAM_RATE, &hw_constraint_rates);
}

static int snd_ali_modem_playback_open(snd_pcm_substream_t * substream)
{
      return snd_ali_modem_open(substream, 0, ALI_MODEM_OUT_CHANNEL);
}

static int snd_ali_modem_capture_open(snd_pcm_substream_t * substream)
{
      return snd_ali_modem_open(substream, 1, ALI_MODEM_IN_CHANNEL);
}

static snd_pcm_ops_t snd_ali_modem_playback_ops = {
      .open =           snd_ali_modem_playback_open,
      .close =    snd_ali_close,
      .ioctl =    snd_pcm_lib_ioctl,
      .hw_params =      snd_ali_modem_hw_params,
      .hw_free =  snd_ali_hw_free,
      .prepare =  snd_ali_prepare,
      .trigger =  snd_ali_trigger,
      .pointer =  snd_ali_pointer,
};

static snd_pcm_ops_t snd_ali_modem_capture_ops = {
      .open =           snd_ali_modem_capture_open,
      .close =    snd_ali_close,
      .ioctl =    snd_pcm_lib_ioctl,
      .hw_params =      snd_ali_modem_hw_params,
      .hw_free =  snd_ali_hw_free,
      .prepare =  snd_ali_prepare,
      .trigger =  snd_ali_trigger,
      .pointer =  snd_ali_pointer,
};


struct ali_pcm_description {
      char *name;
      unsigned int playback_num;
      unsigned int capture_num;
      snd_pcm_ops_t *playback_ops;
      snd_pcm_ops_t *capture_ops;
      unsigned short class;
};


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


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

      err = snd_pcm_new(codec->card, desc->name, device,
                    desc->playback_num, desc->capture_num, &pcm);
      if (err < 0) {
            snd_printk(KERN_ERR "snd_ali_pcm: err called snd_pcm_new.\n");
            return err;
      }
      pcm->private_data = codec;
      pcm->private_free = snd_ali_pcm_free;
      if (desc->playback_ops)
            snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, desc->playback_ops);
      if (desc->capture_ops)
            snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, desc->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_class = desc->class;
      pcm->dev_subclass = SNDRV_PCM_SUBCLASS_GENERIC_MIX;
      strcpy(pcm->name, desc->name);
      codec->pcm[0] = pcm;
      return 0;
}

static struct ali_pcm_description ali_pcms[] = {
      { "ALI 5451", ALI_CHANNELS, 1, &snd_ali_playback_ops, &snd_ali_capture_ops },
      { "ALI 5451 modem", 1, 1, &snd_ali_modem_playback_ops, &snd_ali_modem_capture_ops, SNDRV_PCM_CLASS_MODEM }
};

static int __devinit snd_ali_build_pcms(ali_t *codec)
{
      int i, err;
      for(i = 0 ; i < codec->num_of_codecs && i < ARRAY_SIZE(ali_pcms) ; i++)
            if((err = snd_ali_pcm(codec, i, &ali_pcms[i])) < 0)
                  return err;
      return 0;
}


#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}

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)
{
      ali_t *codec = kcontrol->private_data;
      unsigned int enable;

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

      spin_lock_irq(&codec->reg_lock);
      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_irq(&codec->reg_lock);
      return 0;
}

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

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

      spin_lock_irq(&codec->reg_lock);
      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_irq(&codec->reg_lock);
      
      return change;
}

static snd_kcontrol_new_t snd_ali5451_mixer_spdif[] __devinitdata = {
      /* spdif aplayback switch */
      /* FIXME: "IEC958 Playback Switch" may conflict with one on ac97_codec */
      ALI5451_SPDIF(SNDRV_CTL_NAME_IEC958("Output ",NONE,SWITCH), 0, 0),
      /* spdif out to spdif channel */
      ALI5451_SPDIF(SNDRV_CTL_NAME_IEC958("Channel Output ",NONE,SWITCH), 0, 1),
      /* spdif in from spdif channel */
      ALI5451_SPDIF(SNDRV_CTL_NAME_IEC958("",CAPTURE,SWITCH), 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[ac97->num] = NULL;
}

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

      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;

      for ( i = 0 ; i < codec->num_of_codecs ; i++) {
            ac97.num = i;
            if ((err = snd_ac97_mixer(codec->ac97_bus, &ac97, &codec->ac97[i])) < 0) {
                  snd_printk(KERN_ERR "ali mixer %d creating error.\n", i);
                  if(i == 0)
                        return err;
                  codec->num_of_codecs = 1;
                  break;
            }
      }

      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, pm_message_t state)
{
      ali_t *chip = card->pm_private_data;
      ali_image_t *im;
      int i, j;

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

      for(i = 0 ; i < chip->num_of_codecs ; i++) {
            if (chip->pcm[i])
                  snd_pcm_suspend_all(chip->pcm[i]);
            if(chip->ac97[i])
                  snd_ac97_suspend(chip->ac97[i]);
      }

      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);
      pci_disable_device(chip->pci);
      return 0;
}

static int ali_resume(snd_card_t *card)
{
      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);

      for(i = 0 ; i < chip->num_of_codecs ; i++)
            if(chip->ac97[i])
                  snd_ac97_resume(chip->ac97[i]);
      
      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) {
            synchronize_irq(codec->irq);
            free_irq(codec->irq, (void *)codec);
      }
      if (codec->port)
            pci_release_regions(codec->pci);
      pci_disable_device(codec->pci);
#ifdef CONFIG_PM
      kfree(codec->image);
#endif
      pci_dev_put(codec->pci_m1533);
      pci_dev_put(codec->pci_m7101);
      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(KERN_ERR "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;
      }

      codec->num_of_codecs = 1;

      /* secondary codec - modem */
      if (inl(ALI_REG(codec, ALI_SCTRL)) & ALI_SCTRL_CODEC2_READY) {
            codec->num_of_codecs++;
            outl(inl(ALI_REG(codec, ALI_SCTRL)) |
                  (ALI_SCTRL_LINE_IN2|ALI_SCTRL_GPIO_IN2|ALI_SCTRL_LINE_OUT_EN),
                  ALI_REG(codec, ALI_SCTRL));
      }

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

}

/* proc for register dump */
static void snd_ali_proc_read(snd_info_entry_t *entry, snd_info_buffer_t *buf)
{
      ali_t *codec = entry->private_data;
      int i;
      for(i = 0 ; i < 256 ; i+= 4)
            snd_iprintf(buf, "%02x: %08x\n", i, inl(ALI_REG(codec, i)));
}

static void __devinit snd_ali_proc_init(ali_t *codec)
{
      snd_info_entry_t *entry;
      if(!snd_card_proc_new(codec->card, "ali5451", &entry))
            snd_info_set_text_ops(entry, codec, 1024, snd_ali_proc_read);
}

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(KERN_ERR "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 snd_device_ops_t ops = {
            (snd_dev_free_t *)snd_ali_dev_free,
            NULL,
            NULL
        };

      *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_set_dma_mask(pci, 0x7fffffff) < 0 ||
          pci_set_consistent_dma_mask(pci, 0x7fffffff) < 0) {
            snd_printk(KERN_ERR "architecture does not support 31bit PCI busmaster DMA\n");
            pci_disable_device(pci);
            return -ENXIO;
      }

      if ((codec = kzalloc(sizeof(*codec), GFP_KERNEL)) == NULL) {
            pci_disable_device(pci);
            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_get_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_get_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(KERN_ERR "ali create: chip init error.\n");
            return err;
      }

#ifdef CONFIG_PM
      codec->image = kmalloc(sizeof(*codec->image), GFP_KERNEL);
      if (! codec->image)
            snd_printk(KERN_WARNING "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)
{
      snd_card_t *card;
      ali_t *codec;
      int err;

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

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

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

      snd_ali_proc_init(codec);

      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);
      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 = {
      .name = "ALI 5451",
      .id_table = snd_ali_ids,
      .probe = snd_ali_probe,
      .remove = __devexit_p(snd_ali_remove),
      SND_PCI_PM_CALLBACKS
};                                

static int __init alsa_card_ali_init(void)
{
      return pci_register_driver(&driver);
}

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

module_init(alsa_card_ali_init)
module_exit(alsa_card_ali_exit)

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