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via82xx.c

/*
 *   ALSA driver for VIA VT82xx (South Bridge)
 *
 *   VT82C686A/B/C, VT8233A/C, VT8235
 *
 *    Copyright (c) 2000 Jaroslav Kysela <perex@perex.cz>
 *                       Tjeerd.Mulder <Tjeerd.Mulder@fujitsu-siemens.com>
 *                    2002 Takashi Iwai <tiwai@suse.de>
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, 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 License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

/*
 * Changes:
 *
 * Dec. 19, 2002  Takashi Iwai <tiwai@suse.de>
 *    - use the DSX channels for the first pcm playback.
 *      (on VIA8233, 8233C and 8235 only)
 *      this will allow you play simultaneously up to 4 streams.
 *      multi-channel playback is assigned to the second device
 *      on these chips.
 *    - support the secondary capture (on VIA8233/C,8235)
 *    - SPDIF support
 *      the DSX3 channel can be used for SPDIF output.
 *      on VIA8233A, this channel is assigned to the second pcm
 *      playback.
 *      the card config of alsa-lib will assign the correct
 *      device for applications.
 *    - clean up the code, separate low-level initialization
 *      routines for each chipset.
 *
 * Sep. 26, 2005  Karsten Wiese <annabellesgarden@yahoo.de>
 *    - Optimize position calculation for the 823x chips. 
 */

#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/gameport.h>
#include <linux/moduleparam.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/info.h>
#include <sound/tlv.h>
#include <sound/ac97_codec.h>
#include <sound/mpu401.h>
#include <sound/initval.h>

#if 0
#define POINTER_DEBUG
#endif

MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
MODULE_DESCRIPTION("VIA VT82xx audio");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("{{VIA,VT82C686A/B/C,pci},{VIA,VT8233A/C,8235}}");

#if defined(CONFIG_GAMEPORT) || (defined(MODULE) && defined(CONFIG_GAMEPORT_MODULE))
#define SUPPORT_JOYSTICK 1
#endif

static int index = SNDRV_DEFAULT_IDX1;    /* Index 0-MAX */
static char *id = SNDRV_DEFAULT_STR1;     /* ID for this card */
static long mpu_port;
#ifdef SUPPORT_JOYSTICK
static int joystick;
#endif
static int ac97_clock = 48000;
static char *ac97_quirk;
static int dxs_support;

module_param(index, int, 0444);
MODULE_PARM_DESC(index, "Index value for VIA 82xx bridge.");
module_param(id, charp, 0444);
MODULE_PARM_DESC(id, "ID string for VIA 82xx bridge.");
module_param(mpu_port, long, 0444);
MODULE_PARM_DESC(mpu_port, "MPU-401 port. (VT82C686x only)");
#ifdef SUPPORT_JOYSTICK
module_param(joystick, bool, 0444);
MODULE_PARM_DESC(joystick, "Enable joystick. (VT82C686x only)");
#endif
module_param(ac97_clock, int, 0444);
MODULE_PARM_DESC(ac97_clock, "AC'97 codec clock (default 48000Hz).");
module_param(ac97_quirk, charp, 0444);
MODULE_PARM_DESC(ac97_quirk, "AC'97 workaround for strange hardware.");
module_param(dxs_support, int, 0444);
MODULE_PARM_DESC(dxs_support, "Support for DXS channels (0 = auto, 1 = enable, 2 = disable, 3 = 48k only, 4 = no VRA, 5 = enable any sample rate)");

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


/* revision numbers for via686 */
#define VIA_REV_686_A         0x10
#define VIA_REV_686_B         0x11
#define VIA_REV_686_C         0x12
#define VIA_REV_686_D         0x13
#define VIA_REV_686_E         0x14
#define VIA_REV_686_H         0x20

/* revision numbers for via8233 */
#define VIA_REV_PRE_8233      0x10  /* not in market */
#define VIA_REV_8233C         0x20  /* 2 rec, 4 pb, 1 multi-pb */
#define VIA_REV_8233          0x30  /* 2 rec, 4 pb, 1 multi-pb, spdif */
#define VIA_REV_8233A         0x40  /* 1 rec, 1 multi-pb, spdf */
#define VIA_REV_8235          0x50  /* 2 rec, 4 pb, 1 multi-pb, spdif */
#define VIA_REV_8237          0x60
#define VIA_REV_8251          0x70

/*
 *  Direct registers
 */

#define VIAREG(via, x) ((via)->port + VIA_REG_##x)
#define VIADEV_REG(viadev, x) ((viadev)->port + VIA_REG_##x)

/* common offsets */
#define VIA_REG_OFFSET_STATUS       0x00  /* byte - channel status */
#define   VIA_REG_STAT_ACTIVE       0x80  /* RO */
#define   VIA8233_SHADOW_STAT_ACTIVE      0x08  /* RO */
#define   VIA_REG_STAT_PAUSED       0x40  /* RO */
#define   VIA_REG_STAT_TRIGGER_QUEUED     0x08  /* RO */
#define   VIA_REG_STAT_STOPPED            0x04  /* RWC */
#define   VIA_REG_STAT_EOL          0x02  /* RWC */
#define   VIA_REG_STAT_FLAG         0x01  /* RWC */
#define VIA_REG_OFFSET_CONTROL            0x01  /* byte - channel control */
#define   VIA_REG_CTRL_START        0x80  /* WO */
#define   VIA_REG_CTRL_TERMINATE    0x40  /* WO */
#define   VIA_REG_CTRL_AUTOSTART    0x20
#define   VIA_REG_CTRL_PAUSE        0x08  /* RW */
#define   VIA_REG_CTRL_INT_STOP           0x04        
#define   VIA_REG_CTRL_INT_EOL            0x02
#define   VIA_REG_CTRL_INT_FLAG           0x01
#define   VIA_REG_CTRL_RESET        0x01  /* RW - probably reset? undocumented */
#define   VIA_REG_CTRL_INT (VIA_REG_CTRL_INT_FLAG | VIA_REG_CTRL_INT_EOL | VIA_REG_CTRL_AUTOSTART)
#define VIA_REG_OFFSET_TYPE         0x02  /* byte - channel type (686 only) */
#define   VIA_REG_TYPE_AUTOSTART    0x80  /* RW - autostart at EOL */
#define   VIA_REG_TYPE_16BIT        0x20  /* RW */
#define   VIA_REG_TYPE_STEREO       0x10  /* RW */
#define   VIA_REG_TYPE_INT_LLINE    0x00
#define   VIA_REG_TYPE_INT_LSAMPLE  0x04
#define   VIA_REG_TYPE_INT_LESSONE  0x08
#define   VIA_REG_TYPE_INT_MASK           0x0c
#define   VIA_REG_TYPE_INT_EOL            0x02
#define   VIA_REG_TYPE_INT_FLAG           0x01
#define VIA_REG_OFFSET_TABLE_PTR    0x04  /* dword - channel table pointer */
#define VIA_REG_OFFSET_CURR_PTR           0x04  /* dword - channel current pointer */
#define VIA_REG_OFFSET_STOP_IDX           0x08  /* dword - stop index, channel type, sample rate */
#define   VIA8233_REG_TYPE_16BIT    0x00200000  /* RW */
#define   VIA8233_REG_TYPE_STEREO   0x00100000  /* RW */
#define VIA_REG_OFFSET_CURR_COUNT   0x0c  /* dword - channel current count (24 bit) */
#define VIA_REG_OFFSET_CURR_INDEX   0x0f  /* byte - channel current index (for via8233 only) */

#define DEFINE_VIA_REGSET(name,val) \
enum {\
      VIA_REG_##name##_STATUS       = (val),\
      VIA_REG_##name##_CONTROL      = (val) + 0x01,\
      VIA_REG_##name##_TYPE         = (val) + 0x02,\
      VIA_REG_##name##_TABLE_PTR    = (val) + 0x04,\
      VIA_REG_##name##_CURR_PTR     = (val) + 0x04,\
      VIA_REG_##name##_STOP_IDX     = (val) + 0x08,\
      VIA_REG_##name##_CURR_COUNT   = (val) + 0x0c,\
}

/* playback block */
DEFINE_VIA_REGSET(PLAYBACK, 0x00);
DEFINE_VIA_REGSET(CAPTURE, 0x10);
DEFINE_VIA_REGSET(FM, 0x20);

/* AC'97 */
#define VIA_REG_AC97                0x80  /* dword */
#define   VIA_REG_AC97_CODEC_ID_MASK      (3<<30)
#define   VIA_REG_AC97_CODEC_ID_SHIFT     30
#define   VIA_REG_AC97_CODEC_ID_PRIMARY   0x00
#define   VIA_REG_AC97_CODEC_ID_SECONDARY 0x01
#define   VIA_REG_AC97_SECONDARY_VALID    (1<<27)
#define   VIA_REG_AC97_PRIMARY_VALID      (1<<25)
#define   VIA_REG_AC97_BUSY         (1<<24)
#define   VIA_REG_AC97_READ         (1<<23)
#define   VIA_REG_AC97_CMD_SHIFT    16
#define   VIA_REG_AC97_CMD_MASK           0x7e
#define   VIA_REG_AC97_DATA_SHIFT   0
#define   VIA_REG_AC97_DATA_MASK    0xffff

#define VIA_REG_SGD_SHADOW          0x84  /* dword */
/* via686 */
#define   VIA_REG_SGD_STAT_PB_FLAG  (1<<0)
#define   VIA_REG_SGD_STAT_CP_FLAG  (1<<1)
#define   VIA_REG_SGD_STAT_FM_FLAG  (1<<2)
#define   VIA_REG_SGD_STAT_PB_EOL   (1<<4)
#define   VIA_REG_SGD_STAT_CP_EOL   (1<<5)
#define   VIA_REG_SGD_STAT_FM_EOL   (1<<6)
#define   VIA_REG_SGD_STAT_PB_STOP  (1<<8)
#define   VIA_REG_SGD_STAT_CP_STOP  (1<<9)
#define   VIA_REG_SGD_STAT_FM_STOP  (1<<10)
#define   VIA_REG_SGD_STAT_PB_ACTIVE      (1<<12)
#define   VIA_REG_SGD_STAT_CP_ACTIVE      (1<<13)
#define   VIA_REG_SGD_STAT_FM_ACTIVE      (1<<14)
/* via8233 */
#define   VIA8233_REG_SGD_STAT_FLAG (1<<0)
#define   VIA8233_REG_SGD_STAT_EOL  (1<<1)
#define   VIA8233_REG_SGD_STAT_STOP (1<<2)
#define   VIA8233_REG_SGD_STAT_ACTIVE     (1<<3)
#define VIA8233_INTR_MASK(chan) ((VIA8233_REG_SGD_STAT_FLAG|VIA8233_REG_SGD_STAT_EOL) << ((chan) * 4))
#define   VIA8233_REG_SGD_CHAN_SDX  0
#define   VIA8233_REG_SGD_CHAN_MULTI      4
#define   VIA8233_REG_SGD_CHAN_REC  6
#define   VIA8233_REG_SGD_CHAN_REC1 7

#define VIA_REG_GPI_STATUS          0x88
#define VIA_REG_GPI_INTR            0x8c

/* multi-channel and capture registers for via8233 */
DEFINE_VIA_REGSET(MULTPLAY, 0x40);
DEFINE_VIA_REGSET(CAPTURE_8233, 0x60);

/* via8233-specific registers */
#define VIA_REG_OFS_PLAYBACK_VOLUME_L     0x02  /* byte */
#define VIA_REG_OFS_PLAYBACK_VOLUME_R     0x03  /* byte */
#define VIA_REG_OFS_MULTPLAY_FORMAT 0x02  /* byte - format and channels */
#define   VIA_REG_MULTPLAY_FMT_8BIT 0x00
#define   VIA_REG_MULTPLAY_FMT_16BIT      0x80
#define   VIA_REG_MULTPLAY_FMT_CH_MASK    0x70  /* # channels << 4 (valid = 1,2,4,6) */
#define VIA_REG_OFS_CAPTURE_FIFO    0x02  /* byte - bit 6 = fifo  enable */
#define   VIA_REG_CAPTURE_FIFO_ENABLE     0x40

#define VIA_DXS_MAX_VOLUME          31    /* max. volume (attenuation) of reg 0x32/33 */

#define VIA_REG_CAPTURE_CHANNEL           0x63  /* byte - input select */
#define   VIA_REG_CAPTURE_CHANNEL_MIC     0x4
#define   VIA_REG_CAPTURE_CHANNEL_LINE    0
#define   VIA_REG_CAPTURE_SELECT_CODEC    0x03  /* recording source codec (0 = primary) */

#define VIA_TBL_BIT_FLAG      0x40000000
#define VIA_TBL_BIT_EOL       0x80000000

/* pci space */
#define VIA_ACLINK_STAT       0x40
#define  VIA_ACLINK_C11_READY 0x20
#define  VIA_ACLINK_C10_READY 0x10
#define  VIA_ACLINK_C01_READY 0x04 /* secondary codec ready */
#define  VIA_ACLINK_LOWPOWER  0x02 /* low-power state */
#define  VIA_ACLINK_C00_READY 0x01 /* primary codec ready */
#define VIA_ACLINK_CTRL       0x41
#define  VIA_ACLINK_CTRL_ENABLE     0x80 /* 0: disable, 1: enable */
#define  VIA_ACLINK_CTRL_RESET      0x40 /* 0: assert, 1: de-assert */
#define  VIA_ACLINK_CTRL_SYNC 0x20 /* 0: release SYNC, 1: force SYNC hi */
#define  VIA_ACLINK_CTRL_SDO  0x10 /* 0: release SDO, 1: force SDO hi */
#define  VIA_ACLINK_CTRL_VRA  0x08 /* 0: disable VRA, 1: enable VRA */
#define  VIA_ACLINK_CTRL_PCM  0x04 /* 0: disable PCM, 1: enable PCM */
#define  VIA_ACLINK_CTRL_FM   0x02 /* via686 only */
#define  VIA_ACLINK_CTRL_SB   0x01 /* via686 only */
#define  VIA_ACLINK_CTRL_INIT (VIA_ACLINK_CTRL_ENABLE|\
                         VIA_ACLINK_CTRL_RESET|\
                         VIA_ACLINK_CTRL_PCM|\
                         VIA_ACLINK_CTRL_VRA)
#define VIA_FUNC_ENABLE       0x42
#define  VIA_FUNC_MIDI_PNP    0x80 /* FIXME: it's 0x40 in the datasheet! */
#define  VIA_FUNC_MIDI_IRQMASK      0x40 /* FIXME: not documented! */
#define  VIA_FUNC_RX2C_WRITE  0x20
#define  VIA_FUNC_SB_FIFO_EMPTY     0x10
#define  VIA_FUNC_ENABLE_GAME 0x08
#define  VIA_FUNC_ENABLE_FM   0x04
#define  VIA_FUNC_ENABLE_MIDI 0x02
#define  VIA_FUNC_ENABLE_SB   0x01
#define VIA_PNP_CONTROL       0x43
#define VIA_FM_NMI_CTRL       0x48
#define VIA8233_VOLCHG_CTRL   0x48
#define VIA8233_SPDIF_CTRL    0x49
#define  VIA8233_SPDIF_DX3    0x08
#define  VIA8233_SPDIF_SLOT_MASK    0x03
#define  VIA8233_SPDIF_SLOT_1011    0x00
#define  VIA8233_SPDIF_SLOT_34            0x01
#define  VIA8233_SPDIF_SLOT_78            0x02
#define  VIA8233_SPDIF_SLOT_69            0x03

/*
 */

#define VIA_DXS_AUTO    0
#define VIA_DXS_ENABLE  1
#define VIA_DXS_DISABLE 2
#define VIA_DXS_48K     3
#define VIA_DXS_NO_VRA  4
#define VIA_DXS_SRC     5


/*
 * pcm stream
 */

struct snd_via_sg_table {
      unsigned int offset;
      unsigned int size;
} ;

#define VIA_TABLE_SIZE  255
#define VIA_MAX_BUFSIZE (1<<24)

struct viadev {
      unsigned int reg_offset;
      unsigned long port;
      int direction;    /* playback = 0, capture = 1 */
        struct snd_pcm_substream *substream;
      int running;
      unsigned int tbl_entries; /* # descriptors */
      struct snd_dma_buffer table;
      struct snd_via_sg_table *idx_table;
      /* for recovery from the unexpected pointer */
      unsigned int lastpos;
      unsigned int fragsize;
      unsigned int bufsize;
      unsigned int bufsize2;
      int hwptr_done;         /* processed frame position in the buffer */
      int in_interrupt;
      int shadow_shift;
};


enum { TYPE_CARD_VIA686 = 1, TYPE_CARD_VIA8233 };
enum { TYPE_VIA686, TYPE_VIA8233, TYPE_VIA8233A };

#define VIA_MAX_DEVS    7     /* 4 playback, 1 multi, 2 capture */

struct via_rate_lock {
      spinlock_t lock;
      int rate;
      int used;
};

struct via82xx {
      int irq;

      unsigned long port;
      struct resource *mpu_res;
      int chip_type;
      unsigned char revision;

      unsigned char old_legacy;
      unsigned char old_legacy_cfg;
#ifdef CONFIG_PM
      unsigned char legacy_saved;
      unsigned char legacy_cfg_saved;
      unsigned char spdif_ctrl_saved;
      unsigned char capture_src_saved[2];
      unsigned int mpu_port_saved;
#endif

      unsigned char playback_volume[4][2]; /* for VIA8233/C/8235; default = 0 */
      unsigned char playback_volume_c[2]; /* for VIA8233/C/8235; default = 0 */

      unsigned int intr_mask; /* SGD_SHADOW mask to check interrupts */

      struct pci_dev *pci;
      struct snd_card *card;

      unsigned int num_devs;
      unsigned int playback_devno, multi_devno, capture_devno;
      struct viadev devs[VIA_MAX_DEVS];
      struct via_rate_lock rates[2]; /* playback and capture */
      unsigned int dxs_fixed: 1;    /* DXS channel accepts only 48kHz */
      unsigned int no_vra: 1;       /* no need to set VRA on DXS channels */
      unsigned int dxs_src: 1;      /* use full SRC capabilities of DXS */
      unsigned int spdif_on: 1;     /* only spdif rates work to external DACs */

      struct snd_pcm *pcms[2];
      struct snd_rawmidi *rmidi;

      struct snd_ac97_bus *ac97_bus;
      struct snd_ac97 *ac97;
      unsigned int ac97_clock;
      unsigned int ac97_secondary;  /* secondary AC'97 codec is present */

      spinlock_t reg_lock;
      struct snd_info_entry *proc_entry;

#ifdef SUPPORT_JOYSTICK
      struct gameport *gameport;
#endif
};

static struct pci_device_id snd_via82xx_ids[] = {
      /* 0x1106, 0x3058 */
      { PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686_5, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TYPE_CARD_VIA686, },   /* 686A */
      /* 0x1106, 0x3059 */
      { PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8233_5, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TYPE_CARD_VIA8233, },    /* VT8233 */
      { 0, }
};

MODULE_DEVICE_TABLE(pci, snd_via82xx_ids);

/*
 */

/*
 * allocate and initialize the descriptor buffers
 * periods = number of periods
 * fragsize = period size in bytes
 */
static int build_via_table(struct viadev *dev, struct snd_pcm_substream *substream,
                     struct pci_dev *pci,
                     unsigned int periods, unsigned int fragsize)
{
      unsigned int i, idx, ofs, rest;
      struct via82xx *chip = snd_pcm_substream_chip(substream);

      if (dev->table.area == NULL) {
            /* the start of each lists must be aligned to 8 bytes,
             * but the kernel pages are much bigger, so we don't care
             */
            if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(chip->pci),
                              PAGE_ALIGN(VIA_TABLE_SIZE * 2 * 8),
                              &dev->table) < 0)
                  return -ENOMEM;
      }
      if (! dev->idx_table) {
            dev->idx_table = kmalloc(sizeof(*dev->idx_table) * VIA_TABLE_SIZE, GFP_KERNEL);
            if (! dev->idx_table)
                  return -ENOMEM;
      }

      /* fill the entries */
      idx = 0;
      ofs = 0;
      for (i = 0; i < periods; i++) {
            rest = fragsize;
            /* fill descriptors for a period.
             * a period can be split to several descriptors if it's
             * over page boundary.
             */
            do {
                  unsigned int r;
                  unsigned int flag;
                  unsigned int addr;

                  if (idx >= VIA_TABLE_SIZE) {
                        snd_printk(KERN_ERR "via82xx: too much table size!\n");
                        return -EINVAL;
                  }
                  addr = snd_pcm_sgbuf_get_addr(substream, ofs);
                  ((u32 *)dev->table.area)[idx << 1] = cpu_to_le32(addr);
                  r = snd_pcm_sgbuf_get_chunk_size(substream, ofs, rest);
                  rest -= r;
                  if (! rest) {
                        if (i == periods - 1)
                              flag = VIA_TBL_BIT_EOL; /* buffer boundary */
                        else
                              flag = VIA_TBL_BIT_FLAG; /* period boundary */
                  } else
                        flag = 0; /* period continues to the next */
                  /*
                  printk(KERN_DEBUG "via: tbl %d: at %d  size %d "
                         "(rest %d)\n", idx, ofs, r, rest);
                  */
                  ((u32 *)dev->table.area)[(idx<<1) + 1] = cpu_to_le32(r | flag);
                  dev->idx_table[idx].offset = ofs;
                  dev->idx_table[idx].size = r;
                  ofs += r;
                  idx++;
            } while (rest > 0);
      }
      dev->tbl_entries = idx;
      dev->bufsize = periods * fragsize;
      dev->bufsize2 = dev->bufsize / 2;
      dev->fragsize = fragsize;
      return 0;
}


static int clean_via_table(struct viadev *dev, struct snd_pcm_substream *substream,
                     struct pci_dev *pci)
{
      if (dev->table.area) {
            snd_dma_free_pages(&dev->table);
            dev->table.area = NULL;
      }
      kfree(dev->idx_table);
      dev->idx_table = NULL;
      return 0;
}

/*
 *  Basic I/O
 */

static inline unsigned int snd_via82xx_codec_xread(struct via82xx *chip)
{
      return inl(VIAREG(chip, AC97));
}
 
static inline void snd_via82xx_codec_xwrite(struct via82xx *chip, unsigned int val)
{
      outl(val, VIAREG(chip, AC97));
}
 
static int snd_via82xx_codec_ready(struct via82xx *chip, int secondary)
{
      unsigned int timeout = 1000;  /* 1ms */
      unsigned int val;
      
      while (timeout-- > 0) {
            udelay(1);
            if (!((val = snd_via82xx_codec_xread(chip)) & VIA_REG_AC97_BUSY))
                  return val & 0xffff;
      }
      snd_printk(KERN_ERR "codec_ready: codec %i is not ready [0x%x]\n",
               secondary, snd_via82xx_codec_xread(chip));
      return -EIO;
}
 
static int snd_via82xx_codec_valid(struct via82xx *chip, int secondary)
{
      unsigned int timeout = 1000;  /* 1ms */
      unsigned int val, val1;
      unsigned int stat = !secondary ? VIA_REG_AC97_PRIMARY_VALID :
                               VIA_REG_AC97_SECONDARY_VALID;
      
      while (timeout-- > 0) {
            val = snd_via82xx_codec_xread(chip);
            val1 = val & (VIA_REG_AC97_BUSY | stat);
            if (val1 == stat)
                  return val & 0xffff;
            udelay(1);
      }
      return -EIO;
}
 
static void snd_via82xx_codec_wait(struct snd_ac97 *ac97)
{
      struct via82xx *chip = ac97->private_data;
      int err;
      err = snd_via82xx_codec_ready(chip, ac97->num);
      /* here we need to wait fairly for long time.. */
      msleep(500);
}

static void snd_via82xx_codec_write(struct snd_ac97 *ac97,
                            unsigned short reg,
                            unsigned short val)
{
      struct via82xx *chip = ac97->private_data;
      unsigned int xval;

      xval = !ac97->num ? VIA_REG_AC97_CODEC_ID_PRIMARY : VIA_REG_AC97_CODEC_ID_SECONDARY;
      xval <<= VIA_REG_AC97_CODEC_ID_SHIFT;
      xval |= reg << VIA_REG_AC97_CMD_SHIFT;
      xval |= val << VIA_REG_AC97_DATA_SHIFT;
      snd_via82xx_codec_xwrite(chip, xval);
      snd_via82xx_codec_ready(chip, ac97->num);
}

static unsigned short snd_via82xx_codec_read(struct snd_ac97 *ac97, unsigned short reg)
{
      struct via82xx *chip = ac97->private_data;
      unsigned int xval, val = 0xffff;
      int again = 0;

      xval = ac97->num << VIA_REG_AC97_CODEC_ID_SHIFT;
      xval |= ac97->num ? VIA_REG_AC97_SECONDARY_VALID : VIA_REG_AC97_PRIMARY_VALID;
      xval |= VIA_REG_AC97_READ;
      xval |= (reg & 0x7f) << VIA_REG_AC97_CMD_SHIFT;
            while (1) {
                  if (again++ > 3) {
                  snd_printk(KERN_ERR "codec_read: codec %i is not valid [0x%x]\n",
                           ac97->num, snd_via82xx_codec_xread(chip));
                        return 0xffff;
            }
            snd_via82xx_codec_xwrite(chip, xval);
            udelay (20);
            if (snd_via82xx_codec_valid(chip, ac97->num) >= 0) {
                  udelay(25);
                  val = snd_via82xx_codec_xread(chip);
                  break;
            }
      }
      return val & 0xffff;
}

static void snd_via82xx_channel_reset(struct via82xx *chip, struct viadev *viadev)
{
      outb(VIA_REG_CTRL_PAUSE | VIA_REG_CTRL_TERMINATE | VIA_REG_CTRL_RESET,
           VIADEV_REG(viadev, OFFSET_CONTROL));
      inb(VIADEV_REG(viadev, OFFSET_CONTROL));
      udelay(50);
      /* disable interrupts */
      outb(0x00, VIADEV_REG(viadev, OFFSET_CONTROL));
      /* clear interrupts */
      outb(0x03, VIADEV_REG(viadev, OFFSET_STATUS));
      outb(0x00, VIADEV_REG(viadev, OFFSET_TYPE)); /* for via686 */
      // outl(0, VIADEV_REG(viadev, OFFSET_CURR_PTR));
      viadev->lastpos = 0;
      viadev->hwptr_done = 0;
}


/*
 *  Interrupt handler
 *  Used for 686 and 8233A
 */
static irqreturn_t snd_via686_interrupt(int irq, void *dev_id)
{
      struct via82xx *chip = dev_id;
      unsigned int status;
      unsigned int i;

      status = inl(VIAREG(chip, SGD_SHADOW));
      if (! (status & chip->intr_mask)) {
            if (chip->rmidi)
                  /* check mpu401 interrupt */
                  return snd_mpu401_uart_interrupt(irq, chip->rmidi->private_data);
            return IRQ_NONE;
      }

      /* check status for each stream */
      spin_lock(&chip->reg_lock);
      for (i = 0; i < chip->num_devs; i++) {
            struct viadev *viadev = &chip->devs[i];
            unsigned char c_status = inb(VIADEV_REG(viadev, OFFSET_STATUS));
            if (! (c_status & (VIA_REG_STAT_EOL|VIA_REG_STAT_FLAG|VIA_REG_STAT_STOPPED)))
                  continue;
            if (viadev->substream && viadev->running) {
                  /*
                   * Update hwptr_done based on 'period elapsed'
                   * interrupts. We'll use it, when the chip returns 0 
                   * for OFFSET_CURR_COUNT.
                   */
                  if (c_status & VIA_REG_STAT_EOL)
                        viadev->hwptr_done = 0;
                  else
                        viadev->hwptr_done += viadev->fragsize;
                  viadev->in_interrupt = c_status;
                  spin_unlock(&chip->reg_lock);
                  snd_pcm_period_elapsed(viadev->substream);
                  spin_lock(&chip->reg_lock);
                  viadev->in_interrupt = 0;
            }
            outb(c_status, VIADEV_REG(viadev, OFFSET_STATUS)); /* ack */
      }
      spin_unlock(&chip->reg_lock);
      return IRQ_HANDLED;
}

/*
 *  Interrupt handler
 */
static irqreturn_t snd_via8233_interrupt(int irq, void *dev_id)
{
      struct via82xx *chip = dev_id;
      unsigned int status;
      unsigned int i;
      int irqreturn = 0;

      /* check status for each stream */
      spin_lock(&chip->reg_lock);
      status = inl(VIAREG(chip, SGD_SHADOW));

      for (i = 0; i < chip->num_devs; i++) {
            struct viadev *viadev = &chip->devs[i];
            struct snd_pcm_substream *substream;
            unsigned char c_status, shadow_status;

            shadow_status = (status >> viadev->shadow_shift) &
                  (VIA8233_SHADOW_STAT_ACTIVE|VIA_REG_STAT_EOL|
                   VIA_REG_STAT_FLAG);
            c_status = shadow_status & (VIA_REG_STAT_EOL|VIA_REG_STAT_FLAG);
            if (!c_status)
                  continue;

            substream = viadev->substream;
            if (substream && viadev->running) {
                  /*
                   * Update hwptr_done based on 'period elapsed'
                   * interrupts. We'll use it, when the chip returns 0 
                   * for OFFSET_CURR_COUNT.
                   */
                  if (c_status & VIA_REG_STAT_EOL)
                        viadev->hwptr_done = 0;
                  else
                        viadev->hwptr_done += viadev->fragsize;
                  viadev->in_interrupt = c_status;
                  if (shadow_status & VIA8233_SHADOW_STAT_ACTIVE)
                        viadev->in_interrupt |= VIA_REG_STAT_ACTIVE;
                  spin_unlock(&chip->reg_lock);

                  snd_pcm_period_elapsed(substream);

                  spin_lock(&chip->reg_lock);
                  viadev->in_interrupt = 0;
            }
            outb(c_status, VIADEV_REG(viadev, OFFSET_STATUS)); /* ack */
            irqreturn = 1;
      }
      spin_unlock(&chip->reg_lock);
      return IRQ_RETVAL(irqreturn);
}

/*
 *  PCM callbacks
 */

/*
 * trigger callback
 */
static int snd_via82xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
      struct via82xx *chip = snd_pcm_substream_chip(substream);
      struct viadev *viadev = substream->runtime->private_data;
      unsigned char val;

      if (chip->chip_type != TYPE_VIA686)
            val = VIA_REG_CTRL_INT;
      else
            val = 0;
      switch (cmd) {
      case SNDRV_PCM_TRIGGER_START:
      case SNDRV_PCM_TRIGGER_RESUME:
            val |= VIA_REG_CTRL_START;
            viadev->running = 1;
            break;
      case SNDRV_PCM_TRIGGER_STOP:
      case SNDRV_PCM_TRIGGER_SUSPEND:
            val = VIA_REG_CTRL_TERMINATE;
            viadev->running = 0;
            break;
      case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
            val |= VIA_REG_CTRL_PAUSE;
            viadev->running = 0;
            break;
      case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
            viadev->running = 1;
            break;
      default:
            return -EINVAL;
      }
      outb(val, VIADEV_REG(viadev, OFFSET_CONTROL));
      if (cmd == SNDRV_PCM_TRIGGER_STOP)
            snd_via82xx_channel_reset(chip, viadev);
      return 0;
}


/*
 * pointer callbacks
 */

/*
 * calculate the linear position at the given sg-buffer index and the rest count
 */

#define check_invalid_pos(viadev,pos) \
      ((pos) < viadev->lastpos && ((pos) >= viadev->bufsize2 ||\
                             viadev->lastpos < viadev->bufsize2))

static inline unsigned int calc_linear_pos(struct viadev *viadev, unsigned int idx,
                                 unsigned int count)
{
      unsigned int size, base, res;

      size = viadev->idx_table[idx].size;
      base = viadev->idx_table[idx].offset;
      res = base + size - count;
      if (res >= viadev->bufsize)
            res -= viadev->bufsize;

      /* check the validity of the calculated position */
      if (size < count) {
            snd_printd(KERN_ERR "invalid via82xx_cur_ptr (size = %d, count = %d)\n",
                     (int)size, (int)count);
            res = viadev->lastpos;
      } else {
            if (! count) {
                  /* Some mobos report count = 0 on the DMA boundary,
                   * i.e. count = size indeed.
                   * Let's check whether this step is above the expected size.
                   */
                  int delta = res - viadev->lastpos;
                  if (delta < 0)
                        delta += viadev->bufsize;
                  if ((unsigned int)delta > viadev->fragsize)
                        res = base;
            }
            if (check_invalid_pos(viadev, res)) {
#ifdef POINTER_DEBUG
                  printk(KERN_DEBUG "fail: idx = %i/%i, lastpos = 0x%x, "
                         "bufsize2 = 0x%x, offsize = 0x%x, size = 0x%x, "
                         "count = 0x%x\n", idx, viadev->tbl_entries,
                         viadev->lastpos, viadev->bufsize2,
                         viadev->idx_table[idx].offset,
                         viadev->idx_table[idx].size, count);
#endif
                  /* count register returns full size when end of buffer is reached */
                  res = base + size;
                  if (check_invalid_pos(viadev, res)) {
                        snd_printd(KERN_ERR "invalid via82xx_cur_ptr (2), "
                                 "using last valid pointer\n");
                        res = viadev->lastpos;
                  }
            }
      }
      return res;
}

/*
 * get the current pointer on via686
 */
static snd_pcm_uframes_t snd_via686_pcm_pointer(struct snd_pcm_substream *substream)
{
      struct via82xx *chip = snd_pcm_substream_chip(substream);
      struct viadev *viadev = substream->runtime->private_data;
      unsigned int idx, ptr, count, res;

      if (snd_BUG_ON(!viadev->tbl_entries))
            return 0;
      if (!(inb(VIADEV_REG(viadev, OFFSET_STATUS)) & VIA_REG_STAT_ACTIVE))
            return 0;

      spin_lock(&chip->reg_lock);
      count = inl(VIADEV_REG(viadev, OFFSET_CURR_COUNT)) & 0xffffff;
      /* The via686a does not have the current index register,
       * so we need to calculate the index from CURR_PTR.
       */
      ptr = inl(VIADEV_REG(viadev, OFFSET_CURR_PTR));
      if (ptr <= (unsigned int)viadev->table.addr)
            idx = 0;
      else /* CURR_PTR holds the address + 8 */
            idx = ((ptr - (unsigned int)viadev->table.addr) / 8 - 1) % viadev->tbl_entries;
      res = calc_linear_pos(viadev, idx, count);
      viadev->lastpos = res; /* remember the last position */
      spin_unlock(&chip->reg_lock);

      return bytes_to_frames(substream->runtime, res);
}

/*
 * get the current pointer on via823x
 */
static snd_pcm_uframes_t snd_via8233_pcm_pointer(struct snd_pcm_substream *substream)
{
      struct via82xx *chip = snd_pcm_substream_chip(substream);
      struct viadev *viadev = substream->runtime->private_data;
      unsigned int idx, count, res;
      int status;
      
      if (snd_BUG_ON(!viadev->tbl_entries))
            return 0;

      spin_lock(&chip->reg_lock);
      count = inl(VIADEV_REG(viadev, OFFSET_CURR_COUNT));
      status = viadev->in_interrupt;
      if (!status)
            status = inb(VIADEV_REG(viadev, OFFSET_STATUS));

      /* An apparent bug in the 8251 is worked around by sending a 
       * REG_CTRL_START. */
      if (chip->revision == VIA_REV_8251 && (status & VIA_REG_STAT_EOL))
            snd_via82xx_pcm_trigger(substream, SNDRV_PCM_TRIGGER_START);

      if (!(status & VIA_REG_STAT_ACTIVE)) {
            res = 0;
            goto unlock;
      }
      if (count & 0xffffff) {
            idx = count >> 24;
            if (idx >= viadev->tbl_entries) {
#ifdef POINTER_DEBUG
                  printk(KERN_DEBUG "fail: invalid idx = %i/%i\n", idx,
                         viadev->tbl_entries);
#endif
                  res = viadev->lastpos;
            } else {
                  count &= 0xffffff;
                  res = calc_linear_pos(viadev, idx, count);
            }
      } else {
            res = viadev->hwptr_done;
            if (!viadev->in_interrupt) {
                  if (status & VIA_REG_STAT_EOL) {
                        res = 0;
                  } else
                        if (status & VIA_REG_STAT_FLAG) {
                              res += viadev->fragsize;
                        }
            }
      }                     
unlock:
      viadev->lastpos = res;
      spin_unlock(&chip->reg_lock);

      return bytes_to_frames(substream->runtime, res);
}


/*
 * hw_params callback:
 * allocate the buffer and build up the buffer description table
 */
static int snd_via82xx_hw_params(struct snd_pcm_substream *substream,
                         struct snd_pcm_hw_params *hw_params)
{
      struct via82xx *chip = snd_pcm_substream_chip(substream);
      struct viadev *viadev = substream->runtime->private_data;
      int err;

      err = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
      if (err < 0)
            return err;
      err = build_via_table(viadev, substream, chip->pci,
                        params_periods(hw_params),
                        params_period_bytes(hw_params));
      if (err < 0)
            return err;

      return 0;
}

/*
 * hw_free callback:
 * clean up the buffer description table and release the buffer
 */
static int snd_via82xx_hw_free(struct snd_pcm_substream *substream)
{
      struct via82xx *chip = snd_pcm_substream_chip(substream);
      struct viadev *viadev = substream->runtime->private_data;

      clean_via_table(viadev, substream, chip->pci);
      snd_pcm_lib_free_pages(substream);
      return 0;
}


/*
 * set up the table pointer
 */
static void snd_via82xx_set_table_ptr(struct via82xx *chip, struct viadev *viadev)
{
      snd_via82xx_codec_ready(chip, 0);
      outl((u32)viadev->table.addr, VIADEV_REG(viadev, OFFSET_TABLE_PTR));
      udelay(20);
      snd_via82xx_codec_ready(chip, 0);
}

/*
 * prepare callback for playback and capture on via686
 */
static void via686_setup_format(struct via82xx *chip, struct viadev *viadev,
                        struct snd_pcm_runtime *runtime)
{
      snd_via82xx_channel_reset(chip, viadev);
      /* this must be set after channel_reset */
      snd_via82xx_set_table_ptr(chip, viadev);
      outb(VIA_REG_TYPE_AUTOSTART |
           (runtime->format == SNDRV_PCM_FORMAT_S16_LE ? VIA_REG_TYPE_16BIT : 0) |
           (runtime->channels > 1 ? VIA_REG_TYPE_STEREO : 0) |
           ((viadev->reg_offset & 0x10) == 0 ? VIA_REG_TYPE_INT_LSAMPLE : 0) |
           VIA_REG_TYPE_INT_EOL |
           VIA_REG_TYPE_INT_FLAG, VIADEV_REG(viadev, OFFSET_TYPE));
}

static int snd_via686_playback_prepare(struct snd_pcm_substream *substream)
{
      struct via82xx *chip = snd_pcm_substream_chip(substream);
      struct viadev *viadev = substream->runtime->private_data;
      struct snd_pcm_runtime *runtime = substream->runtime;

      snd_ac97_set_rate(chip->ac97, AC97_PCM_FRONT_DAC_RATE, runtime->rate);
      snd_ac97_set_rate(chip->ac97, AC97_SPDIF, runtime->rate);
      via686_setup_format(chip, viadev, runtime);
      return 0;
}

static int snd_via686_capture_prepare(struct snd_pcm_substream *substream)
{
      struct via82xx *chip = snd_pcm_substream_chip(substream);
      struct viadev *viadev = substream->runtime->private_data;
      struct snd_pcm_runtime *runtime = substream->runtime;

      snd_ac97_set_rate(chip->ac97, AC97_PCM_LR_ADC_RATE, runtime->rate);
      via686_setup_format(chip, viadev, runtime);
      return 0;
}

/*
 * lock the current rate
 */
static int via_lock_rate(struct via_rate_lock *rec, int rate)
{
      int changed = 0;

      spin_lock_irq(&rec->lock);
      if (rec->rate != rate) {
            if (rec->rate && rec->used > 1) /* already set */
                  changed = -EINVAL;
            else {
                  rec->rate = rate;
                  changed = 1;
            }
      }
      spin_unlock_irq(&rec->lock);
      return changed;
}

/*
 * prepare callback for DSX playback on via823x
 */
static int snd_via8233_playback_prepare(struct snd_pcm_substream *substream)
{
      struct via82xx *chip = snd_pcm_substream_chip(substream);
      struct viadev *viadev = substream->runtime->private_data;
      struct snd_pcm_runtime *runtime = substream->runtime;
      int ac97_rate = chip->dxs_src ? 48000 : runtime->rate;
      int rate_changed;
      u32 rbits;

      if ((rate_changed = via_lock_rate(&chip->rates[0], ac97_rate)) < 0)
            return rate_changed;
      if (rate_changed)
            snd_ac97_set_rate(chip->ac97, AC97_PCM_FRONT_DAC_RATE,
                          chip->no_vra ? 48000 : runtime->rate);
      if (chip->spdif_on && viadev->reg_offset == 0x30)
            snd_ac97_set_rate(chip->ac97, AC97_SPDIF, runtime->rate);

      if (runtime->rate == 48000)
            rbits = 0xfffff;
      else
            rbits = (0x100000 / 48000) * runtime->rate +
                  ((0x100000 % 48000) * runtime->rate) / 48000;
      snd_BUG_ON(rbits & ~0xfffff);
      snd_via82xx_channel_reset(chip, viadev);
      snd_via82xx_set_table_ptr(chip, viadev);
      outb(chip->playback_volume[viadev->reg_offset / 0x10][0],
           VIADEV_REG(viadev, OFS_PLAYBACK_VOLUME_L));
      outb(chip->playback_volume[viadev->reg_offset / 0x10][1],
           VIADEV_REG(viadev, OFS_PLAYBACK_VOLUME_R));
      outl((runtime->format == SNDRV_PCM_FORMAT_S16_LE ? VIA8233_REG_TYPE_16BIT : 0) | /* format */
           (runtime->channels > 1 ? VIA8233_REG_TYPE_STEREO : 0) | /* stereo */
           rbits | /* rate */
           0xff000000,    /* STOP index is never reached */
           VIADEV_REG(viadev, OFFSET_STOP_IDX));
      udelay(20);
      snd_via82xx_codec_ready(chip, 0);
      return 0;
}

/*
 * prepare callback for multi-channel playback on via823x
 */
static int snd_via8233_multi_prepare(struct snd_pcm_substream *substream)
{
      struct via82xx *chip = snd_pcm_substream_chip(substream);
      struct viadev *viadev = substream->runtime->private_data;
      struct snd_pcm_runtime *runtime = substream->runtime;
      unsigned int slots;
      int fmt;

      if (via_lock_rate(&chip->rates[0], runtime->rate) < 0)
            return -EINVAL;
      snd_ac97_set_rate(chip->ac97, AC97_PCM_FRONT_DAC_RATE, runtime->rate);
      snd_ac97_set_rate(chip->ac97, AC97_PCM_SURR_DAC_RATE, runtime->rate);
      snd_ac97_set_rate(chip->ac97, AC97_PCM_LFE_DAC_RATE, runtime->rate);
      snd_ac97_set_rate(chip->ac97, AC97_SPDIF, runtime->rate);
      snd_via82xx_channel_reset(chip, viadev);
      snd_via82xx_set_table_ptr(chip, viadev);

      fmt = (runtime->format == SNDRV_PCM_FORMAT_S16_LE) ?
            VIA_REG_MULTPLAY_FMT_16BIT : VIA_REG_MULTPLAY_FMT_8BIT;
      fmt |= runtime->channels << 4;
      outb(fmt, VIADEV_REG(viadev, OFS_MULTPLAY_FORMAT));
#if 0
      if (chip->revision == VIA_REV_8233A)
            slots = 0;
      else
#endif
      {
            /* set sample number to slot 3, 4, 7, 8, 6, 9 (for VIA8233/C,8235) */
            /* corresponding to FL, FR, RL, RR, C, LFE ?? */
            switch (runtime->channels) {
            case 1: slots = (1<<0) | (1<<4); break;
            case 2: slots = (1<<0) | (2<<4); break;
            case 3: slots = (1<<0) | (2<<4) | (5<<8); break;
            case 4: slots = (1<<0) | (2<<4) | (3<<8) | (4<<12); break;
            case 5: slots = (1<<0) | (2<<4) | (3<<8) | (4<<12) | (5<<16); break;
            case 6: slots = (1<<0) | (2<<4) | (3<<8) | (4<<12) | (5<<16) | (6<<20); break;
            default: slots = 0; break;
            }
      }
      /* STOP index is never reached */
      outl(0xff000000 | slots, VIADEV_REG(viadev, OFFSET_STOP_IDX));
      udelay(20);
      snd_via82xx_codec_ready(chip, 0);
      return 0;
}

/*
 * prepare callback for capture on via823x
 */
static int snd_via8233_capture_prepare(struct snd_pcm_substream *substream)
{
      struct via82xx *chip = snd_pcm_substream_chip(substream);
      struct viadev *viadev = substream->runtime->private_data;
      struct snd_pcm_runtime *runtime = substream->runtime;

      if (via_lock_rate(&chip->rates[1], runtime->rate) < 0)
            return -EINVAL;
      snd_ac97_set_rate(chip->ac97, AC97_PCM_LR_ADC_RATE, runtime->rate);
      snd_via82xx_channel_reset(chip, viadev);
      snd_via82xx_set_table_ptr(chip, viadev);
      outb(VIA_REG_CAPTURE_FIFO_ENABLE, VIADEV_REG(viadev, OFS_CAPTURE_FIFO));
      outl((runtime->format == SNDRV_PCM_FORMAT_S16_LE ? VIA8233_REG_TYPE_16BIT : 0) |
           (runtime->channels > 1 ? VIA8233_REG_TYPE_STEREO : 0) |
           0xff000000,    /* STOP index is never reached */
           VIADEV_REG(viadev, OFFSET_STOP_IDX));
      udelay(20);
      snd_via82xx_codec_ready(chip, 0);
      return 0;
}


/*
 * pcm hardware definition, identical for both playback and capture
 */
static struct snd_pcm_hardware snd_via82xx_hw =
{
      .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_PAUSE),
      .formats =        SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
      .rates =          SNDRV_PCM_RATE_48000,
      .rate_min =       48000,
      .rate_max =       48000,
      .channels_min =         1,
      .channels_max =         2,
      .buffer_bytes_max =     VIA_MAX_BUFSIZE,
      .period_bytes_min =     32,
      .period_bytes_max =     VIA_MAX_BUFSIZE / 2,
      .periods_min =          2,
      .periods_max =          VIA_TABLE_SIZE / 2,
      .fifo_size =            0,
};


/*
 * open callback skeleton
 */
static int snd_via82xx_pcm_open(struct via82xx *chip, struct viadev *viadev,
                        struct snd_pcm_substream *substream)
{
      struct snd_pcm_runtime *runtime = substream->runtime;
      int err;
      struct via_rate_lock *ratep;

      runtime->hw = snd_via82xx_hw;
      
      /* set the hw rate condition */
      ratep = &chip->rates[viadev->direction];
      spin_lock_irq(&ratep->lock);
      ratep->used++;
      if (chip->spdif_on && viadev->reg_offset == 0x30) {
            /* DXS#3 and spdif is on */
            runtime->hw.rates = chip->ac97->rates[AC97_RATES_SPDIF];
            snd_pcm_limit_hw_rates(runtime);
      } else if (chip->dxs_fixed && viadev->reg_offset < 0x40) {
            /* fixed DXS playback rate */
            runtime->hw.rates = SNDRV_PCM_RATE_48000;
            runtime->hw.rate_min = runtime->hw.rate_max = 48000;
      } else if (chip->dxs_src && viadev->reg_offset < 0x40) {
            /* use full SRC capabilities of DXS */
            runtime->hw.rates = (SNDRV_PCM_RATE_CONTINUOUS |
                             SNDRV_PCM_RATE_8000_48000);
            runtime->hw.rate_min = 8000;
            runtime->hw.rate_max = 48000;
      } else if (! ratep->rate) {
            int idx = viadev->direction ? AC97_RATES_ADC : AC97_RATES_FRONT_DAC;
            runtime->hw.rates = chip->ac97->rates[idx];
            snd_pcm_limit_hw_rates(runtime);
      } else {
            /* a fixed rate */
            runtime->hw.rates = SNDRV_PCM_RATE_KNOT;
            runtime->hw.rate_max = runtime->hw.rate_min = ratep->rate;
      }
      spin_unlock_irq(&ratep->lock);

      /* we may remove following constaint when we modify table entries
         in interrupt */
      if ((err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
            return err;

      runtime->private_data = viadev;
      viadev->substream = substream;

      return 0;
}


/*
 * open callback for playback on via686 and via823x DSX
 */
static int snd_via82xx_playback_open(struct snd_pcm_substream *substream)
{
      struct via82xx *chip = snd_pcm_substream_chip(substream);
      struct viadev *viadev = &chip->devs[chip->playback_devno + substream->number];
      int err;

      if ((err = snd_via82xx_pcm_open(chip, viadev, substream)) < 0)
            return err;
      return 0;
}

/*
 * open callback for playback on via823x multi-channel
 */
static int snd_via8233_multi_open(struct snd_pcm_substream *substream)
{
      struct via82xx *chip = snd_pcm_substream_chip(substream);
      struct viadev *viadev = &chip->devs[chip->multi_devno];
      int err;
      /* channels constraint for VIA8233A
       * 3 and 5 channels are not supported
       */
      static unsigned int channels[] = {
            1, 2, 4, 6
      };
      static struct snd_pcm_hw_constraint_list hw_constraints_channels = {
            .count = ARRAY_SIZE(channels),
            .list = channels,
            .mask = 0,
      };

      if ((err = snd_via82xx_pcm_open(chip, viadev, substream)) < 0)
            return err;
      substream->runtime->hw.channels_max = 6;
      if (chip->revision == VIA_REV_8233A)
            snd_pcm_hw_constraint_list(substream->runtime, 0,
                                 SNDRV_PCM_HW_PARAM_CHANNELS,
                                 &hw_constraints_channels);
      return 0;
}

/*
 * open callback for capture on via686 and via823x
 */
static int snd_via82xx_capture_open(struct snd_pcm_substream *substream)
{
      struct via82xx *chip = snd_pcm_substream_chip(substream);
      struct viadev *viadev = &chip->devs[chip->capture_devno + substream->pcm->device];

      return snd_via82xx_pcm_open(chip, viadev, substream);
}

/*
 * close callback
 */
static int snd_via82xx_pcm_close(struct snd_pcm_substream *substream)
{
      struct via82xx *chip = snd_pcm_substream_chip(substream);
      struct viadev *viadev = substream->runtime->private_data;
      struct via_rate_lock *ratep;

      /* release the rate lock */
      ratep = &chip->rates[viadev->direction];
      spin_lock_irq(&ratep->lock);
      ratep->used--;
      if (! ratep->used)
            ratep->rate = 0;
      spin_unlock_irq(&ratep->lock);
      if (! ratep->rate) {
            if (! viadev->direction) {
                  snd_ac97_update_power(chip->ac97,
                                    AC97_PCM_FRONT_DAC_RATE, 0);
                  snd_ac97_update_power(chip->ac97,
                                    AC97_PCM_SURR_DAC_RATE, 0);
                  snd_ac97_update_power(chip->ac97,
                                    AC97_PCM_LFE_DAC_RATE, 0);
            } else
                  snd_ac97_update_power(chip->ac97,
                                    AC97_PCM_LR_ADC_RATE, 0);
      }
      viadev->substream = NULL;
      return 0;
}


/* via686 playback callbacks */
static struct snd_pcm_ops snd_via686_playback_ops = {
      .open =           snd_via82xx_playback_open,
      .close =    snd_via82xx_pcm_close,
      .ioctl =    snd_pcm_lib_ioctl,
      .hw_params =      snd_via82xx_hw_params,
      .hw_free =  snd_via82xx_hw_free,
      .prepare =  snd_via686_playback_prepare,
      .trigger =  snd_via82xx_pcm_trigger,
      .pointer =  snd_via686_pcm_pointer,
      .page =           snd_pcm_sgbuf_ops_page,
};

/* via686 capture callbacks */
static struct snd_pcm_ops snd_via686_capture_ops = {
      .open =           snd_via82xx_capture_open,
      .close =    snd_via82xx_pcm_close,
      .ioctl =    snd_pcm_lib_ioctl,
      .hw_params =      snd_via82xx_hw_params,
      .hw_free =  snd_via82xx_hw_free,
      .prepare =  snd_via686_capture_prepare,
      .trigger =  snd_via82xx_pcm_trigger,
      .pointer =  snd_via686_pcm_pointer,
      .page =           snd_pcm_sgbuf_ops_page,
};

/* via823x DSX playback callbacks */
static struct snd_pcm_ops snd_via8233_playback_ops = {
      .open =           snd_via82xx_playback_open,
      .close =    snd_via82xx_pcm_close,
      .ioctl =    snd_pcm_lib_ioctl,
      .hw_params =      snd_via82xx_hw_params,
      .hw_free =  snd_via82xx_hw_free,
      .prepare =  snd_via8233_playback_prepare,
      .trigger =  snd_via82xx_pcm_trigger,
      .pointer =  snd_via8233_pcm_pointer,
      .page =           snd_pcm_sgbuf_ops_page,
};

/* via823x multi-channel playback callbacks */
static struct snd_pcm_ops snd_via8233_multi_ops = {
      .open =           snd_via8233_multi_open,
      .close =    snd_via82xx_pcm_close,
      .ioctl =    snd_pcm_lib_ioctl,
      .hw_params =      snd_via82xx_hw_params,
      .hw_free =  snd_via82xx_hw_free,
      .prepare =  snd_via8233_multi_prepare,
      .trigger =  snd_via82xx_pcm_trigger,
      .pointer =  snd_via8233_pcm_pointer,
      .page =           snd_pcm_sgbuf_ops_page,
};

/* via823x capture callbacks */
static struct snd_pcm_ops snd_via8233_capture_ops = {
      .open =           snd_via82xx_capture_open,
      .close =    snd_via82xx_pcm_close,
      .ioctl =    snd_pcm_lib_ioctl,
      .hw_params =      snd_via82xx_hw_params,
      .hw_free =  snd_via82xx_hw_free,
      .prepare =  snd_via8233_capture_prepare,
      .trigger =  snd_via82xx_pcm_trigger,
      .pointer =  snd_via8233_pcm_pointer,
      .page =           snd_pcm_sgbuf_ops_page,
};


static void init_viadev(struct via82xx *chip, int idx, unsigned int reg_offset,
                  int shadow_pos, int direction)
{
      chip->devs[idx].reg_offset = reg_offset;
      chip->devs[idx].shadow_shift = shadow_pos * 4;
      chip->devs[idx].direction = direction;
      chip->devs[idx].port = chip->port + reg_offset;
}

/*
 * create pcm instances for VIA8233, 8233C and 8235 (not 8233A)
 */
static int __devinit snd_via8233_pcm_new(struct via82xx *chip)
{
      struct snd_pcm *pcm;
      int i, err;

      chip->playback_devno = 0;     /* x 4 */
      chip->multi_devno = 4;        /* x 1 */
      chip->capture_devno = 5;      /* x 2 */
      chip->num_devs = 7;
      chip->intr_mask = 0x33033333; /* FLAG|EOL for rec0-1, mc, sdx0-3 */

      /* PCM #0:  4 DSX playbacks and 1 capture */
      err = snd_pcm_new(chip->card, chip->card->shortname, 0, 4, 1, &pcm);
      if (err < 0)
            return err;
      snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_via8233_playback_ops);
      snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_via8233_capture_ops);
      pcm->private_data = chip;
      strcpy(pcm->name, chip->card->shortname);
      chip->pcms[0] = pcm;
      /* set up playbacks */
      for (i = 0; i < 4; i++)
            init_viadev(chip, i, 0x10 * i, i, 0);
      /* capture */
      init_viadev(chip, chip->capture_devno, VIA_REG_CAPTURE_8233_STATUS, 6, 1);

      snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV_SG,
                                    snd_dma_pci_data(chip->pci),
                                    64*1024, VIA_MAX_BUFSIZE);

      /* PCM #1:  multi-channel playback and 2nd capture */
      err = snd_pcm_new(chip->card, chip->card->shortname, 1, 1, 1, &pcm);
      if (err < 0)
            return err;
      snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_via8233_multi_ops);
      snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_via8233_capture_ops);
      pcm->private_data = chip;
      strcpy(pcm->name, chip->card->shortname);
      chip->pcms[1] = pcm;
      /* set up playback */
      init_viadev(chip, chip->multi_devno, VIA_REG_MULTPLAY_STATUS, 4, 0);
      /* set up capture */
      init_viadev(chip, chip->capture_devno + 1, VIA_REG_CAPTURE_8233_STATUS + 0x10, 7, 1);

      snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV_SG,
                                    snd_dma_pci_data(chip->pci),
                                    64*1024, VIA_MAX_BUFSIZE);
      return 0;
}

/*
 * create pcm instances for VIA8233A
 */
static int __devinit snd_via8233a_pcm_new(struct via82xx *chip)
{
      struct snd_pcm *pcm;
      int err;

      chip->multi_devno = 0;
      chip->playback_devno = 1;
      chip->capture_devno = 2;
      chip->num_devs = 3;
      chip->intr_mask = 0x03033000; /* FLAG|EOL for rec0, mc, sdx3 */

      /* PCM #0:  multi-channel playback and capture */
      err = snd_pcm_new(chip->card, chip->card->shortname, 0, 1, 1, &pcm);
      if (err < 0)
            return err;
      snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_via8233_multi_ops);
      snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_via8233_capture_ops);
      pcm->private_data = chip;
      strcpy(pcm->name, chip->card->shortname);
      chip->pcms[0] = pcm;
      /* set up playback */
      init_viadev(chip, chip->multi_devno, VIA_REG_MULTPLAY_STATUS, 4, 0);
      /* capture */
      init_viadev(chip, chip->capture_devno, VIA_REG_CAPTURE_8233_STATUS, 6, 1);

      snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV_SG,
                                    snd_dma_pci_data(chip->pci),
                                    64*1024, VIA_MAX_BUFSIZE);

      /* SPDIF supported? */
      if (! ac97_can_spdif(chip->ac97))
            return 0;

      /* PCM #1:  DXS3 playback (for spdif) */
      err = snd_pcm_new(chip->card, chip->card->shortname, 1, 1, 0, &pcm);
      if (err < 0)
            return err;
      snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_via8233_playback_ops);
      pcm->private_data = chip;
      strcpy(pcm->name, chip->card->shortname);
      chip->pcms[1] = pcm;
      /* set up playback */
      init_viadev(chip, chip->playback_devno, 0x30, 3, 0);

      snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV_SG,
                                    snd_dma_pci_data(chip->pci),
                                    64*1024, VIA_MAX_BUFSIZE);
      return 0;
}

/*
 * create a pcm instance for via686a/b
 */
static int __devinit snd_via686_pcm_new(struct via82xx *chip)
{
      struct snd_pcm *pcm;
      int err;

      chip->playback_devno = 0;
      chip->capture_devno = 1;
      chip->num_devs = 2;
      chip->intr_mask = 0x77; /* FLAG | EOL for PB, CP, FM */

      err = snd_pcm_new(chip->card, chip->card->shortname, 0, 1, 1, &pcm);
      if (err < 0)
            return err;
      snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_via686_playback_ops);
      snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_via686_capture_ops);
      pcm->private_data = chip;
      strcpy(pcm->name, chip->card->shortname);
      chip->pcms[0] = pcm;
      init_viadev(chip, 0, VIA_REG_PLAYBACK_STATUS, 0, 0);
      init_viadev(chip, 1, VIA_REG_CAPTURE_STATUS, 0, 1);

      snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV_SG,
                                    snd_dma_pci_data(chip->pci),
                                    64*1024, VIA_MAX_BUFSIZE);
      return 0;
}


/*
 *  Mixer part
 */

static int snd_via8233_capture_source_info(struct snd_kcontrol *kcontrol,
                                 struct snd_ctl_elem_info *uinfo)
{
      /* formerly they were "Line" and "Mic", but it looks like that they
       * have nothing to do with the actual physical connections...
       */
      static char *texts[2] = {
            "Input1", "Input2"
      };
      uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
      uinfo->count = 1;
      uinfo->value.enumerated.items = 2;
      if (uinfo->value.enumerated.item >= 2)
            uinfo->value.enumerated.item = 1;
      strcpy(uinfo->value.enumerated.name, texts[uinfo->value.enumerated.item]);
      return 0;
}

static int snd_via8233_capture_source_get(struct snd_kcontrol *kcontrol,
                                struct snd_ctl_elem_value *ucontrol)
{
      struct via82xx *chip = snd_kcontrol_chip(kcontrol);
      unsigned long port = chip->port + (kcontrol->id.index ? (VIA_REG_CAPTURE_CHANNEL + 0x10) : VIA_REG_CAPTURE_CHANNEL);
      ucontrol->value.enumerated.item[0] = inb(port) & VIA_REG_CAPTURE_CHANNEL_MIC ? 1 : 0;
      return 0;
}

static int snd_via8233_capture_source_put(struct snd_kcontrol *kcontrol,
                                struct snd_ctl_elem_value *ucontrol)
{
      struct via82xx *chip = snd_kcontrol_chip(kcontrol);
      unsigned long port = chip->port + (kcontrol->id.index ? (VIA_REG_CAPTURE_CHANNEL + 0x10) : VIA_REG_CAPTURE_CHANNEL);
      u8 val, oval;

      spin_lock_irq(&chip->reg_lock);
      oval = inb(port);
      val = oval & ~VIA_REG_CAPTURE_CHANNEL_MIC;
      if (ucontrol->value.enumerated.item[0])
            val |= VIA_REG_CAPTURE_CHANNEL_MIC;
      if (val != oval)
            outb(val, port);
      spin_unlock_irq(&chip->reg_lock);
      return val != oval;
}

static struct snd_kcontrol_new snd_via8233_capture_source __devinitdata = {
      .name = "Input Source Select",
      .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
      .info = snd_via8233_capture_source_info,
      .get = snd_via8233_capture_source_get,
      .put = snd_via8233_capture_source_put,
};

#define snd_via8233_dxs3_spdif_info snd_ctl_boolean_mono_info

static int snd_via8233_dxs3_spdif_get(struct snd_kcontrol *kcontrol,
                              struct snd_ctl_elem_value *ucontrol)
{
      struct via82xx *chip = snd_kcontrol_chip(kcontrol);
      u8 val;

      pci_read_config_byte(chip->pci, VIA8233_SPDIF_CTRL, &val);
      ucontrol->value.integer.value[0] = (val & VIA8233_SPDIF_DX3) ? 1 : 0;
      return 0;
}

static int snd_via8233_dxs3_spdif_put(struct snd_kcontrol *kcontrol,
                              struct snd_ctl_elem_value *ucontrol)
{
      struct via82xx *chip = snd_kcontrol_chip(kcontrol);
      u8 val, oval;

      pci_read_config_byte(chip->pci, VIA8233_SPDIF_CTRL, &oval);
      val = oval & ~VIA8233_SPDIF_DX3;
      if (ucontrol->value.integer.value[0])
            val |= VIA8233_SPDIF_DX3;
      /* save the spdif flag for rate filtering */
      chip->spdif_on = ucontrol->value.integer.value[0] ? 1 : 0;
      if (val != oval) {
            pci_write_config_byte(chip->pci, VIA8233_SPDIF_CTRL, val);
            return 1;
      }
      return 0;
}

static struct snd_kcontrol_new snd_via8233_dxs3_spdif_control __devinitdata = {
      .name = SNDRV_CTL_NAME_IEC958("Output ",NONE,SWITCH),
      .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
      .info = snd_via8233_dxs3_spdif_info,
      .get = snd_via8233_dxs3_spdif_get,
      .put = snd_via8233_dxs3_spdif_put,
};

static int snd_via8233_dxs_volume_info(struct snd_kcontrol *kcontrol,
                               struct snd_ctl_elem_info *uinfo)
{
      uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
      uinfo->count = 2;
      uinfo->value.integer.min = 0;
      uinfo->value.integer.max = VIA_DXS_MAX_VOLUME;
      return 0;
}

static int snd_via8233_dxs_volume_get(struct snd_kcontrol *kcontrol,
                              struct snd_ctl_elem_value *ucontrol)
{
      struct via82xx *chip = snd_kcontrol_chip(kcontrol);
      unsigned int idx = snd_ctl_get_ioff(kcontrol, &ucontrol->id);

      ucontrol->value.integer.value[0] = VIA_DXS_MAX_VOLUME - chip->playback_volume[idx][0];
      ucontrol->value.integer.value[1] = VIA_DXS_MAX_VOLUME - chip->playback_volume[idx][1];
      return 0;
}

static int snd_via8233_pcmdxs_volume_get(struct snd_kcontrol *kcontrol,
                               struct snd_ctl_elem_value *ucontrol)
{
      struct via82xx *chip = snd_kcontrol_chip(kcontrol);
      ucontrol->value.integer.value[0] = VIA_DXS_MAX_VOLUME - chip->playback_volume_c[0];
      ucontrol->value.integer.value[1] = VIA_DXS_MAX_VOLUME - chip->playback_volume_c[1];
      return 0;
}

static int snd_via8233_dxs_volume_put(struct snd_kcontrol *kcontrol,
                              struct snd_ctl_elem_value *ucontrol)
{
      struct via82xx *chip = snd_kcontrol_chip(kcontrol);
      unsigned int idx = snd_ctl_get_ioff(kcontrol, &ucontrol->id);
      unsigned long port = chip->port + 0x10 * idx;
      unsigned char val;
      int i, change = 0;

      for (i = 0; i < 2; i++) {
            val = ucontrol->value.integer.value[i];
            if (val > VIA_DXS_MAX_VOLUME)
                  val = VIA_DXS_MAX_VOLUME;
            val = VIA_DXS_MAX_VOLUME - val;
            change |= val != chip->playback_volume[idx][i];
            if (change) {
                  chip->playback_volume[idx][i] = val;
                  outb(val, port + VIA_REG_OFS_PLAYBACK_VOLUME_L + i);
            }
      }
      return change;
}

static int snd_via8233_pcmdxs_volume_put(struct snd_kcontrol *kcontrol,
                               struct snd_ctl_elem_value *ucontrol)
{
      struct via82xx *chip = snd_kcontrol_chip(kcontrol);
      unsigned int idx;
      unsigned char val;
      int i, change = 0;

      for (i = 0; i < 2; i++) {
            val = ucontrol->value.integer.value[i];
            if (val > VIA_DXS_MAX_VOLUME)
                  val = VIA_DXS_MAX_VOLUME;
            val = VIA_DXS_MAX_VOLUME - val;
            if (val != chip->playback_volume_c[i]) {
                  change = 1;
                  chip->playback_volume_c[i] = val;
                  for (idx = 0; idx < 4; idx++) {
                        unsigned long port = chip->port + 0x10 * idx;
                        chip->playback_volume[idx][i] = val;
                        outb(val, port + VIA_REG_OFS_PLAYBACK_VOLUME_L + i);
                  }
            }
      }
      return change;
}

static const DECLARE_TLV_DB_SCALE(db_scale_dxs, -4650, 150, 1);

static struct snd_kcontrol_new snd_via8233_pcmdxs_volume_control __devinitdata = {
      .name = "PCM Playback Volume",
      .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
      .access = (SNDRV_CTL_ELEM_ACCESS_READWRITE |
               SNDRV_CTL_ELEM_ACCESS_TLV_READ),
      .info = snd_via8233_dxs_volume_info,
      .get = snd_via8233_pcmdxs_volume_get,
      .put = snd_via8233_pcmdxs_volume_put,
      .tlv = { .p = db_scale_dxs }
};

static struct snd_kcontrol_new snd_via8233_dxs_volume_control __devinitdata = {
      .name = "VIA DXS Playback Volume",
      .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
      .access = (SNDRV_CTL_ELEM_ACCESS_READWRITE |
               SNDRV_CTL_ELEM_ACCESS_TLV_READ),
      .count = 4,
      .info = snd_via8233_dxs_volume_info,
      .get = snd_via8233_dxs_volume_get,
      .put = snd_via8233_dxs_volume_put,
      .tlv = { .p = db_scale_dxs }
};

/*
 */

static void snd_via82xx_mixer_free_ac97_bus(struct snd_ac97_bus *bus)
{
      struct via82xx *chip = bus->private_data;
      chip->ac97_bus = NULL;
}

static void snd_via82xx_mixer_free_ac97(struct snd_ac97 *ac97)
{
      struct via82xx *chip = ac97->private_data;
      chip->ac97 = NULL;
}

static struct ac97_quirk ac97_quirks[] = {
      {
            .subvendor = 0x1106,
            .subdevice = 0x4161,
            .codec_id = 0x56494161, /* VT1612A */
            .name = "Soltek SL-75DRV5",
            .type = AC97_TUNE_NONE
      },
      {     /* FIXME: which codec? */
            .subvendor = 0x1106,
            .subdevice = 0x4161,
            .name = "ASRock K7VT2",
            .type = AC97_TUNE_HP_ONLY
      },
      {
            .subvendor = 0x1019,
            .subdevice = 0x0a81,
            .name = "ECS K7VTA3",
            .type = AC97_TUNE_HP_ONLY
      },
      {
            .subvendor = 0x1019,
            .subdevice = 0x0a85,
            .name = "ECS L7VMM2",
            .type = AC97_TUNE_HP_ONLY
      },
      {
            .subvendor = 0x1019,
            .subdevice = 0x1841,
            .name = "ECS K7VTA3",
            .type = AC97_TUNE_HP_ONLY
      },
      {
            .subvendor = 0x1849,
            .subdevice = 0x3059,
            .name = "ASRock K7VM2",
            .type = AC97_TUNE_HP_ONLY     /* VT1616 */
      },
      {
            .subvendor = 0x14cd,
            .subdevice = 0x7002,
            .name = "Unknown",
            .type = AC97_TUNE_ALC_JACK
      },
      {
            .subvendor = 0x1071,
            .subdevice = 0x8590,
            .name = "Mitac Mobo",
            .type = AC97_TUNE_ALC_JACK
      },
      {
            .subvendor = 0x161f,
            .subdevice = 0x202b,
            .name = "Arima Notebook",
            .type = AC97_TUNE_HP_ONLY,
      },
      {
            .subvendor = 0x161f,
            .subdevice = 0x2032,
            .name = "Targa Traveller 811",
            .type = AC97_TUNE_HP_ONLY,
      },
      {
            .subvendor = 0x161f,
            .subdevice = 0x2032,
            .name = "m680x",
            .type = AC97_TUNE_HP_ONLY, /* http://launchpad.net/bugs/38546 */
      },
      {
            .subvendor = 0x1297,
            .subdevice = 0xa232,
            .name = "Shuttle AK32VN",
            .type = AC97_TUNE_HP_ONLY
      },
      { } /* terminator */
};

static int __devinit snd_via82xx_mixer_new(struct via82xx *chip, const char *quirk_override)
{
      struct snd_ac97_template ac97;
      int err;
      static struct snd_ac97_bus_ops ops = {
            .write = snd_via82xx_codec_write,
            .read = snd_via82xx_codec_read,
            .wait = snd_via82xx_codec_wait,
      };

      if ((err = snd_ac97_bus(chip->card, 0, &ops, chip, &chip->ac97_bus)) < 0)
            return err;
      chip->ac97_bus->private_free = snd_via82xx_mixer_free_ac97_bus;
      chip->ac97_bus->clock = chip->ac97_clock;

      memset(&ac97, 0, sizeof(ac97));
      ac97.private_data = chip;
      ac97.private_free = snd_via82xx_mixer_free_ac97;
      ac97.pci = chip->pci;
      ac97.scaps = AC97_SCAP_SKIP_MODEM | AC97_SCAP_POWER_SAVE;
      if ((err = snd_ac97_mixer(chip->ac97_bus, &ac97, &chip->ac97)) < 0)
            return err;

      snd_ac97_tune_hardware(chip->ac97, ac97_quirks, quirk_override);

      if (chip->chip_type != TYPE_VIA686) {
            /* use slot 10/11 */
            snd_ac97_update_bits(chip->ac97, AC97_EXTENDED_STATUS, 0x03 << 4, 0x03 << 4);
      }

      return 0;
}

#ifdef SUPPORT_JOYSTICK
#define JOYSTICK_ADDR   0x200
static int __devinit snd_via686_create_gameport(struct via82xx *chip, unsigned char *legacy)
{
      struct gameport *gp;
      struct resource *r;

      if (!joystick)
            return -ENODEV;

      r = request_region(JOYSTICK_ADDR, 8, "VIA686 gameport");
      if (!r) {
            printk(KERN_WARNING "via82xx: cannot reserve joystick port 0x%#x\n",
                   JOYSTICK_ADDR);
            return -EBUSY;
      }

      chip->gameport = gp = gameport_allocate_port();
      if (!gp) {
            printk(KERN_ERR "via82xx: cannot allocate memory for gameport\n");
            release_and_free_resource(r);
            return -ENOMEM;
      }

      gameport_set_name(gp, "VIA686 Gameport");
      gameport_set_phys(gp, "pci%s/gameport0", pci_name(chip->pci));
      gameport_set_dev_parent(gp, &chip->pci->dev);
      gp->io = JOYSTICK_ADDR;
      gameport_set_port_data(gp, r);

      /* Enable legacy joystick port */
      *legacy |= VIA_FUNC_ENABLE_GAME;
      pci_write_config_byte(chip->pci, VIA_FUNC_ENABLE, *legacy);

      gameport_register_port(chip->gameport);

      return 0;
}

static void snd_via686_free_gameport(struct via82xx *chip)
{
      if (chip->gameport) {
            struct resource *r = gameport_get_port_data(chip->gameport);

            gameport_unregister_port(chip->gameport);
            chip->gameport = NULL;
            release_and_free_resource(r);
      }
}
#else
static inline int snd_via686_create_gameport(struct via82xx *chip, unsigned char *legacy)
{
      return -ENOSYS;
}
static inline void snd_via686_free_gameport(struct via82xx *chip) { }
#endif


/*
 *
 */

static int __devinit snd_via8233_init_misc(struct via82xx *chip)
{
      int i, err, caps;
      unsigned char val;

      caps = chip->chip_type == TYPE_VIA8233A ? 1 : 2;
      for (i = 0; i < caps; i++) {
            snd_via8233_capture_source.index = i;
            err = snd_ctl_add(chip->card, snd_ctl_new1(&snd_via8233_capture_source, chip));
            if (err < 0)
                  return err;
      }
      if (ac97_can_spdif(chip->ac97)) {
            err = snd_ctl_add(chip->card, snd_ctl_new1(&snd_via8233_dxs3_spdif_control, chip));
            if (err < 0)
                  return err;
      }
      if (chip->chip_type != TYPE_VIA8233A) {
            /* when no h/w PCM volume control is found, use DXS volume control
             * as the PCM vol control
             */
            struct snd_ctl_elem_id sid;
            memset(&sid, 0, sizeof(sid));
            strcpy(sid.name, "PCM Playback Volume");
            sid.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
            if (! snd_ctl_find_id(chip->card, &sid)) {
                  snd_printd(KERN_INFO "Using DXS as PCM Playback\n");
                  err = snd_ctl_add(chip->card, snd_ctl_new1(&snd_via8233_pcmdxs_volume_control, chip));
                  if (err < 0)
                        return err;
            }
            else /* Using DXS when PCM emulation is enabled is really weird */
            {
                  /* Standalone DXS controls */
                  err = snd_ctl_add(chip->card, snd_ctl_new1(&snd_via8233_dxs_volume_control, chip));
                  if (err < 0)
                        return err;
            }
      }
      /* select spdif data slot 10/11 */
      pci_read_config_byte(chip->pci, VIA8233_SPDIF_CTRL, &val);
      val = (val & ~VIA8233_SPDIF_SLOT_MASK) | VIA8233_SPDIF_SLOT_1011;
      val &= ~VIA8233_SPDIF_DX3; /* SPDIF off as default */
      pci_write_config_byte(chip->pci, VIA8233_SPDIF_CTRL, val);

      return 0;
}

static int __devinit snd_via686_init_misc(struct via82xx *chip)
{
      unsigned char legacy, legacy_cfg;
      int rev_h = 0;

      legacy = chip->old_legacy;
      legacy_cfg = chip->old_legacy_cfg;
      legacy |= VIA_FUNC_MIDI_IRQMASK;    /* FIXME: correct? (disable MIDI) */
      legacy &= ~VIA_FUNC_ENABLE_GAME;    /* disable joystick */
      if (chip->revision >= VIA_REV_686_H) {
            rev_h = 1;
            if (mpu_port >= 0x200) {      /* force MIDI */
                  mpu_port &= 0xfffc;
                  pci_write_config_dword(chip->pci, 0x18, mpu_port | 0x01);
#ifdef CONFIG_PM
                  chip->mpu_port_saved = mpu_port;
#endif
            } else {
                  mpu_port = pci_resource_start(chip->pci, 2);
            }
      } else {
            switch (mpu_port) {     /* force MIDI */
            case 0x300:
            case 0x310:
            case 0x320:
            case 0x330:
                  legacy_cfg &= ~(3 << 2);
                  legacy_cfg |= (mpu_port & 0x0030) >> 2;
                  break;
            default:                /* no, use BIOS settings */
                  if (legacy & VIA_FUNC_ENABLE_MIDI)
                        mpu_port = 0x300 + ((legacy_cfg & 0x000c) << 2);
                  break;
            }
      }
      if (mpu_port >= 0x200 &&
          (chip->mpu_res = request_region(mpu_port, 2, "VIA82xx MPU401"))
          != NULL) {
            if (rev_h)
                  legacy |= VIA_FUNC_MIDI_PNP;  /* enable PCI I/O 2 */
            legacy |= VIA_FUNC_ENABLE_MIDI;
      } else {
            if (rev_h)
                  legacy &= ~VIA_FUNC_MIDI_PNP; /* disable PCI I/O 2 */
            legacy &= ~VIA_FUNC_ENABLE_MIDI;
            mpu_port = 0;
      }

      pci_write_config_byte(chip->pci, VIA_FUNC_ENABLE, legacy);
      pci_write_config_byte(chip->pci, VIA_PNP_CONTROL, legacy_cfg);
      if (chip->mpu_res) {
            if (snd_mpu401_uart_new(chip->card, 0, MPU401_HW_VIA686A,
                              mpu_port, MPU401_INFO_INTEGRATED,
                              chip->irq, 0, &chip->rmidi) < 0) {
                  printk(KERN_WARNING "unable to initialize MPU-401"
                         " at 0x%lx, skipping\n", mpu_port);
                  legacy &= ~VIA_FUNC_ENABLE_MIDI;
            } else {
                  legacy &= ~VIA_FUNC_MIDI_IRQMASK;   /* enable MIDI interrupt */
            }
            pci_write_config_byte(chip->pci, VIA_FUNC_ENABLE, legacy);
      }

      snd_via686_create_gameport(chip, &legacy);

#ifdef CONFIG_PM
      chip->legacy_saved = legacy;
      chip->legacy_cfg_saved = legacy_cfg;
#endif

      return 0;
}


/*
 * proc interface
 */
static void snd_via82xx_proc_read(struct snd_info_entry *entry,
                          struct snd_info_buffer *buffer)
{
      struct via82xx *chip = entry->private_data;
      int i;
      
      snd_iprintf(buffer, "%s\n\n", chip->card->longname);
      for (i = 0; i < 0xa0; i += 4) {
            snd_iprintf(buffer, "%02x: %08x\n", i, inl(chip->port + i));
      }
}

static void __devinit snd_via82xx_proc_init(struct via82xx *chip)
{
      struct snd_info_entry *entry;

      if (! snd_card_proc_new(chip->card, "via82xx", &entry))
            snd_info_set_text_ops(entry, chip, snd_via82xx_proc_read);
}

/*
 *
 */

static int snd_via82xx_chip_init(struct via82xx *chip)
{
      unsigned int val;
      unsigned long end_time;
      unsigned char pval;

#if 0 /* broken on K7M? */
      if (chip->chip_type == TYPE_VIA686)
            /* disable all legacy ports */
            pci_write_config_byte(chip->pci, VIA_FUNC_ENABLE, 0);
#endif
      pci_read_config_byte(chip->pci, VIA_ACLINK_STAT, &pval);
      if (! (pval & VIA_ACLINK_C00_READY)) { /* codec not ready? */
            /* deassert ACLink reset, force SYNC */
            pci_write_config_byte(chip->pci, VIA_ACLINK_CTRL,
                              VIA_ACLINK_CTRL_ENABLE |
                              VIA_ACLINK_CTRL_RESET |
                              VIA_ACLINK_CTRL_SYNC);
            udelay(100);
#if 1 /* FIXME: should we do full reset here for all chip models? */
            pci_write_config_byte(chip->pci, VIA_ACLINK_CTRL, 0x00);
            udelay(100);
#else
            /* deassert ACLink reset, force SYNC (warm AC'97 reset) */
            pci_write_config_byte(chip->pci, VIA_ACLINK_CTRL,
                              VIA_ACLINK_CTRL_RESET|VIA_ACLINK_CTRL_SYNC);
            udelay(2);
#endif
            /* ACLink on, deassert ACLink reset, VSR, SGD data out */
            /* note - FM data out has trouble with non VRA codecs !! */
            pci_write_config_byte(chip->pci, VIA_ACLINK_CTRL, VIA_ACLINK_CTRL_INIT);
            udelay(100);
      }
      
      /* Make sure VRA is enabled, in case we didn't do a
       * complete codec reset, above */
      pci_read_config_byte(chip->pci, VIA_ACLINK_CTRL, &pval);
      if ((pval & VIA_ACLINK_CTRL_INIT) != VIA_ACLINK_CTRL_INIT) {
            /* ACLink on, deassert ACLink reset, VSR, SGD data out */
            /* note - FM data out has trouble with non VRA codecs !! */
            pci_write_config_byte(chip->pci, VIA_ACLINK_CTRL, VIA_ACLINK_CTRL_INIT);
            udelay(100);
      }

      /* wait until codec ready */
      end_time = jiffies + msecs_to_jiffies(750);
      do {
            pci_read_config_byte(chip->pci, VIA_ACLINK_STAT, &pval);
            if (pval & VIA_ACLINK_C00_READY) /* primary codec ready */
                  break;
            schedule_timeout_uninterruptible(1);
      } while (time_before(jiffies, end_time));

      if ((val = snd_via82xx_codec_xread(chip)) & VIA_REG_AC97_BUSY)
            snd_printk(KERN_ERR "AC'97 codec is not ready [0x%x]\n", val);

#if 0 /* FIXME: we don't support the second codec yet so skip the detection now.. */
      snd_via82xx_codec_xwrite(chip, VIA_REG_AC97_READ |
                         VIA_REG_AC97_SECONDARY_VALID |
                         (VIA_REG_AC97_CODEC_ID_SECONDARY << VIA_REG_AC97_CODEC_ID_SHIFT));
      end_time = jiffies + msecs_to_jiffies(750);
      snd_via82xx_codec_xwrite(chip, VIA_REG_AC97_READ |
                         VIA_REG_AC97_SECONDARY_VALID |
                         (VIA_REG_AC97_CODEC_ID_SECONDARY << VIA_REG_AC97_CODEC_ID_SHIFT));
      do {
            if ((val = snd_via82xx_codec_xread(chip)) & VIA_REG_AC97_SECONDARY_VALID) {
                  chip->ac97_secondary = 1;
                  goto __ac97_ok2;
            }
            schedule_timeout_uninterruptible(1);
      } while (time_before(jiffies, end_time));
      /* This is ok, the most of motherboards have only one codec */

      __ac97_ok2:
#endif

      if (chip->chip_type == TYPE_VIA686) {
            /* route FM trap to IRQ, disable FM trap */
            pci_write_config_byte(chip->pci, VIA_FM_NMI_CTRL, 0);
            /* disable all GPI interrupts */
            outl(0, VIAREG(chip, GPI_INTR));
      }

      if (chip->chip_type != TYPE_VIA686) {
            /* Workaround for Award BIOS bug:
             * DXS channels don't work properly with VRA if MC97 is disabled.
             */
            struct pci_dev *pci;
            pci = pci_get_device(0x1106, 0x3068, NULL); /* MC97 */
            if (pci) {
                  unsigned char data;
                  pci_read_config_byte(pci, 0x44, &data);
                  pci_write_config_byte(pci, 0x44, data | 0x40);
                  pci_dev_put(pci);
            }
      }

      if (chip->chip_type != TYPE_VIA8233A) {
            int i, idx;
            for (idx = 0; idx < 4; idx++) {
                  unsigned long port = chip->port + 0x10 * idx;
                  for (i = 0; i < 2; i++) {
                        chip->playback_volume[idx][i]=chip->playback_volume_c[i];
                        outb(chip->playback_volume_c[i],
                             port + VIA_REG_OFS_PLAYBACK_VOLUME_L + i);
                  }
            }
      }

      return 0;
}

#ifdef CONFIG_PM
/*
 * power management
 */
static int snd_via82xx_suspend(struct pci_dev *pci, pm_message_t state)
{
      struct snd_card *card = pci_get_drvdata(pci);
      struct via82xx *chip = card->private_data;
      int i;

      snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
      for (i = 0; i < 2; i++)
            snd_pcm_suspend_all(chip->pcms[i]);
      for (i = 0; i < chip->num_devs; i++)
            snd_via82xx_channel_reset(chip, &chip->devs[i]);
      synchronize_irq(chip->irq);
      snd_ac97_suspend(chip->ac97);

      /* save misc values */
      if (chip->chip_type != TYPE_VIA686) {
            pci_read_config_byte(chip->pci, VIA8233_SPDIF_CTRL, &chip->spdif_ctrl_saved);
            chip->capture_src_saved[0] = inb(chip->port + VIA_REG_CAPTURE_CHANNEL);
            chip->capture_src_saved[1] = inb(chip->port + VIA_REG_CAPTURE_CHANNEL + 0x10);
      }

      pci_disable_device(pci);
      pci_save_state(pci);
      pci_set_power_state(pci, pci_choose_state(pci, state));
      return 0;
}

static int snd_via82xx_resume(struct pci_dev *pci)
{
      struct snd_card *card = pci_get_drvdata(pci);
      struct via82xx *chip = card->private_data;
      int i;

      pci_set_power_state(pci, PCI_D0);
      pci_restore_state(pci);
      if (pci_enable_device(pci) < 0) {
            printk(KERN_ERR "via82xx: pci_enable_device failed, "
                   "disabling device\n");
            snd_card_disconnect(card);
            return -EIO;
      }
      pci_set_master(pci);

      snd_via82xx_chip_init(chip);

      if (chip->chip_type == TYPE_VIA686) {
            if (chip->mpu_port_saved)
                  pci_write_config_dword(chip->pci, 0x18, chip->mpu_port_saved | 0x01);
            pci_write_config_byte(chip->pci, VIA_FUNC_ENABLE, chip->legacy_saved);
            pci_write_config_byte(chip->pci, VIA_PNP_CONTROL, chip->legacy_cfg_saved);
      } else {
            pci_write_config_byte(chip->pci, VIA8233_SPDIF_CTRL, chip->spdif_ctrl_saved);
            outb(chip->capture_src_saved[0], chip->port + VIA_REG_CAPTURE_CHANNEL);
            outb(chip->capture_src_saved[1], chip->port + VIA_REG_CAPTURE_CHANNEL + 0x10);
      }

      snd_ac97_resume(chip->ac97);

      for (i = 0; i < chip->num_devs; i++)
            snd_via82xx_channel_reset(chip, &chip->devs[i]);

      snd_power_change_state(card, SNDRV_CTL_POWER_D0);
      return 0;
}
#endif /* CONFIG_PM */

static int snd_via82xx_free(struct via82xx *chip)
{
      unsigned int i;

      if (chip->irq < 0)
            goto __end_hw;
      /* disable interrupts */
      for (i = 0; i < chip->num_devs; i++)
            snd_via82xx_channel_reset(chip, &chip->devs[i]);

      if (chip->irq >= 0)
            free_irq(chip->irq, chip);
 __end_hw:
      release_and_free_resource(chip->mpu_res);
      pci_release_regions(chip->pci);

      if (chip->chip_type == TYPE_VIA686) {
            snd_via686_free_gameport(chip);
            pci_write_config_byte(chip->pci, VIA_FUNC_ENABLE, chip->old_legacy);
            pci_write_config_byte(chip->pci, VIA_PNP_CONTROL, chip->old_legacy_cfg);
      }
      pci_disable_device(chip->pci);
      kfree(chip);
      return 0;
}

static int snd_via82xx_dev_free(struct snd_device *device)
{
      struct via82xx *chip = device->device_data;
      return snd_via82xx_free(chip);
}

static int __devinit snd_via82xx_create(struct snd_card *card,
                              struct pci_dev *pci,
                              int chip_type,
                              int revision,
                              unsigned int ac97_clock,
                              struct via82xx ** r_via)
{
      struct via82xx *chip;
      int err;
        static struct snd_device_ops ops = {
            .dev_free = snd_via82xx_dev_free,
        };

      if ((err = pci_enable_device(pci)) < 0)
            return err;

      if ((chip = kzalloc(sizeof(*chip), GFP_KERNEL)) == NULL) {
            pci_disable_device(pci);
            return -ENOMEM;
      }

      chip->chip_type = chip_type;
      chip->revision = revision;

      spin_lock_init(&chip->reg_lock);
      spin_lock_init(&chip->rates[0].lock);
      spin_lock_init(&chip->rates[1].lock);
      chip->card = card;
      chip->pci = pci;
      chip->irq = -1;

      pci_read_config_byte(pci, VIA_FUNC_ENABLE, &chip->old_legacy);
      pci_read_config_byte(pci, VIA_PNP_CONTROL, &chip->old_legacy_cfg);
      pci_write_config_byte(chip->pci, VIA_FUNC_ENABLE,
                        chip->old_legacy & ~(VIA_FUNC_ENABLE_SB|VIA_FUNC_ENABLE_FM));

      if ((err = pci_request_regions(pci, card->driver)) < 0) {
            kfree(chip);
            pci_disable_device(pci);
            return err;
      }
      chip->port = pci_resource_start(pci, 0);
      if (request_irq(pci->irq,
                  chip_type == TYPE_VIA8233 ?
                  snd_via8233_interrupt : snd_via686_interrupt,
                  IRQF_SHARED,
                  card->driver, chip)) {
            snd_printk(KERN_ERR "unable to grab IRQ %d\n", pci->irq);
            snd_via82xx_free(chip);
            return -EBUSY;
      }
      chip->irq = pci->irq;
      if (ac97_clock >= 8000 && ac97_clock <= 48000)
            chip->ac97_clock = ac97_clock;
      synchronize_irq(chip->irq);

      if ((err = snd_via82xx_chip_init(chip)) < 0) {
            snd_via82xx_free(chip);
            return err;
      }

      if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
            snd_via82xx_free(chip);
            return err;
      }

      /* The 8233 ac97 controller does not implement the master bit
       * in the pci command register. IMHO this is a violation of the PCI spec.
       * We call pci_set_master here because it does not hurt. */
      pci_set_master(pci);

      snd_card_set_dev(card, &pci->dev);

      *r_via = chip;
      return 0;
}

struct via823x_info {
      int revision;
      char *name;
      int type;
};
static struct via823x_info via823x_cards[] __devinitdata = {
      { VIA_REV_PRE_8233, "VIA 8233-Pre", TYPE_VIA8233 },
      { VIA_REV_8233C, "VIA 8233C", TYPE_VIA8233 },
      { VIA_REV_8233, "VIA 8233", TYPE_VIA8233 },
      { VIA_REV_8233A, "VIA 8233A", TYPE_VIA8233A },
      { VIA_REV_8235, "VIA 8235", TYPE_VIA8233 },
      { VIA_REV_8237, "VIA 8237", TYPE_VIA8233 },
      { VIA_REV_8251, "VIA 8251", TYPE_VIA8233 },
};

/*
 * auto detection of DXS channel supports.
 */

static struct snd_pci_quirk dxs_whitelist[] __devinitdata = {
      SND_PCI_QUIRK(0x1005, 0x4710, "Avance Logic Mobo", VIA_DXS_ENABLE),
      SND_PCI_QUIRK(0x1019, 0x0996, "ESC Mobo", VIA_DXS_48K),
      SND_PCI_QUIRK(0x1019, 0x0a81, "ECS K7VTA3 v8.0", VIA_DXS_NO_VRA),
      SND_PCI_QUIRK(0x1019, 0x0a85, "ECS L7VMM2", VIA_DXS_NO_VRA),
      SND_PCI_QUIRK_VENDOR(0x1019, "ESC K8", VIA_DXS_SRC),
      SND_PCI_QUIRK(0x1019, 0xaa01, "ESC K8T890-A", VIA_DXS_SRC),
      SND_PCI_QUIRK(0x1025, 0x0033, "Acer Inspire 1353LM", VIA_DXS_NO_VRA),
      SND_PCI_QUIRK(0x1025, 0x0046, "Acer Aspire 1524 WLMi", VIA_DXS_SRC),
      SND_PCI_QUIRK_VENDOR(0x1043, "ASUS A7/A8", VIA_DXS_NO_VRA),
      SND_PCI_QUIRK_VENDOR(0x1071, "Diverse Notebook", VIA_DXS_NO_VRA),
      SND_PCI_QUIRK(0x10cf, 0x118e, "FSC Laptop", VIA_DXS_ENABLE),
      SND_PCI_QUIRK_VENDOR(0x1106, "ASRock", VIA_DXS_SRC),
      SND_PCI_QUIRK(0x1297, 0xa231, "Shuttle AK31v2", VIA_DXS_SRC),
      SND_PCI_QUIRK(0x1297, 0xa232, "Shuttle", VIA_DXS_SRC),
      SND_PCI_QUIRK(0x1297, 0xc160, "Shuttle Sk41G", VIA_DXS_SRC),
      SND_PCI_QUIRK(0x1458, 0xa002, "Gigabyte GA-7VAXP", VIA_DXS_ENABLE),
      SND_PCI_QUIRK(0x1462, 0x3800, "MSI KT266", VIA_DXS_ENABLE),
      SND_PCI_QUIRK(0x1462, 0x7120, "MSI KT4V", VIA_DXS_ENABLE),
      SND_PCI_QUIRK(0x1462, 0x7142, "MSI K8MM-V", VIA_DXS_ENABLE),
      SND_PCI_QUIRK_VENDOR(0x1462, "MSI Mobo", VIA_DXS_SRC),
      SND_PCI_QUIRK(0x147b, 0x1401, "ABIT KD7(-RAID)", VIA_DXS_ENABLE),
      SND_PCI_QUIRK(0x147b, 0x1411, "ABIT VA-20", VIA_DXS_ENABLE),
      SND_PCI_QUIRK(0x147b, 0x1413, "ABIT KV8 Pro", VIA_DXS_ENABLE),
      SND_PCI_QUIRK(0x147b, 0x1415, "ABIT AV8", VIA_DXS_NO_VRA),
      SND_PCI_QUIRK(0x14ff, 0x0403, "Twinhead mobo", VIA_DXS_ENABLE),
      SND_PCI_QUIRK(0x14ff, 0x0408, "Twinhead laptop", VIA_DXS_SRC),
      SND_PCI_QUIRK(0x1558, 0x4701, "Clevo D470", VIA_DXS_SRC),
      SND_PCI_QUIRK(0x1584, 0x8120, "Diverse Laptop", VIA_DXS_ENABLE),
      SND_PCI_QUIRK(0x1584, 0x8123, "Targa/Uniwill", VIA_DXS_NO_VRA),
      SND_PCI_QUIRK(0x161f, 0x202b, "Amira Notebook", VIA_DXS_NO_VRA),
      SND_PCI_QUIRK(0x161f, 0x2032, "m680x machines", VIA_DXS_48K),
      SND_PCI_QUIRK(0x1631, 0xe004, "PB EasyNote 3174", VIA_DXS_ENABLE),
      SND_PCI_QUIRK(0x1695, 0x3005, "EPoX EP-8K9A", VIA_DXS_ENABLE),
      SND_PCI_QUIRK_VENDOR(0x1695, "EPoX mobo", VIA_DXS_SRC),
      SND_PCI_QUIRK_VENDOR(0x16f3, "Jetway K8", VIA_DXS_SRC),
      SND_PCI_QUIRK_VENDOR(0x1734, "FSC Laptop", VIA_DXS_SRC),
      SND_PCI_QUIRK(0x1849, 0x3059, "ASRock K7VM2", VIA_DXS_NO_VRA),
      SND_PCI_QUIRK_VENDOR(0x1849, "ASRock mobo", VIA_DXS_SRC),
      SND_PCI_QUIRK(0x1919, 0x200a, "Soltek SL-K8",  VIA_DXS_NO_VRA),
      SND_PCI_QUIRK(0x4005, 0x4710, "MSI K7T266", VIA_DXS_SRC),
      { } /* terminator */
};

static int __devinit check_dxs_list(struct pci_dev *pci, int revision)
{
      const struct snd_pci_quirk *w;

      w = snd_pci_quirk_lookup(pci, dxs_whitelist);
      if (w) {
            snd_printdd(KERN_INFO "via82xx: DXS white list for %s found\n",
                      w->name);
            return w->value;
      }

      /* for newer revision, default to DXS_SRC */
      if (revision >= VIA_REV_8235)
            return VIA_DXS_SRC;

      /*
       * not detected, try 48k rate only to be sure.
       */
      printk(KERN_INFO "via82xx: Assuming DXS channels with 48k fixed sample rate.\n");
      printk(KERN_INFO "         Please try dxs_support=5 option\n");
      printk(KERN_INFO "         and report if it works on your machine.\n");
      printk(KERN_INFO "         For more details, read ALSA-Configuration.txt.\n");
      return VIA_DXS_48K;
};

static int __devinit snd_via82xx_probe(struct pci_dev *pci,
                               const struct pci_device_id *pci_id)
{
      struct snd_card *card;
      struct via82xx *chip;
      int chip_type = 0, card_type;
      unsigned int i;
      int err;

      err = snd_card_create(index, id, THIS_MODULE, 0, &card);
      if (err < 0)
            return err;

      card_type = pci_id->driver_data;
      switch (card_type) {
      case TYPE_CARD_VIA686:
            strcpy(card->driver, "VIA686A");
            sprintf(card->shortname, "VIA 82C686A/B rev%x", pci->revision);
            chip_type = TYPE_VIA686;
            break;
      case TYPE_CARD_VIA8233:
            chip_type = TYPE_VIA8233;
            sprintf(card->shortname, "VIA 823x rev%x", pci->revision);
            for (i = 0; i < ARRAY_SIZE(via823x_cards); i++) {
                  if (pci->revision == via823x_cards[i].revision) {
                        chip_type = via823x_cards[i].type;
                        strcpy(card->shortname, via823x_cards[i].name);
                        break;
                  }
            }
            if (chip_type != TYPE_VIA8233A) {
                  if (dxs_support == VIA_DXS_AUTO)
                        dxs_support = check_dxs_list(pci, pci->revision);
                  /* force to use VIA8233 or 8233A model according to
                   * dxs_support module option
                   */
                  if (dxs_support == VIA_DXS_DISABLE)
                        chip_type = TYPE_VIA8233A;
                  else
                        chip_type = TYPE_VIA8233;
            }
            if (chip_type == TYPE_VIA8233A)
                  strcpy(card->driver, "VIA8233A");
            else if (pci->revision >= VIA_REV_8237)
                  strcpy(card->driver, "VIA8237"); /* no slog assignment */
            else
                  strcpy(card->driver, "VIA8233");
            break;
      default:
            snd_printk(KERN_ERR "invalid card type %d\n", card_type);
            err = -EINVAL;
            goto __error;
      }
            
      if ((err = snd_via82xx_create(card, pci, chip_type, pci->revision,
                              ac97_clock, &chip)) < 0)
            goto __error;
      card->private_data = chip;
      if ((err = snd_via82xx_mixer_new(chip, ac97_quirk)) < 0)
            goto __error;

      if (chip_type == TYPE_VIA686) {
            if ((err = snd_via686_pcm_new(chip)) < 0 ||
                (err = snd_via686_init_misc(chip)) < 0)
                  goto __error;
      } else {
            if (chip_type == TYPE_VIA8233A) {
                  if ((err = snd_via8233a_pcm_new(chip)) < 0)
                        goto __error;
                  // chip->dxs_fixed = 1; /* FIXME: use 48k for DXS #3? */
            } else {
                  if ((err = snd_via8233_pcm_new(chip)) < 0)
                        goto __error;
                  if (dxs_support == VIA_DXS_48K)
                        chip->dxs_fixed = 1;
                  else if (dxs_support == VIA_DXS_NO_VRA)
                        chip->no_vra = 1;
                  else if (dxs_support == VIA_DXS_SRC) {
                        chip->no_vra = 1;
                        chip->dxs_src = 1;
                  }
            }
            if ((err = snd_via8233_init_misc(chip)) < 0)
                  goto __error;
      }

      /* disable interrupts */
      for (i = 0; i < chip->num_devs; i++)
            snd_via82xx_channel_reset(chip, &chip->devs[i]);

      snprintf(card->longname, sizeof(card->longname),
             "%s with %s at %#lx, irq %d", card->shortname,
             snd_ac97_get_short_name(chip->ac97), chip->port, chip->irq);

      snd_via82xx_proc_init(chip);

      if ((err = snd_card_register(card)) < 0) {
            snd_card_free(card);
            return err;
      }
      pci_set_drvdata(pci, card);
      return 0;

 __error:
      snd_card_free(card);
      return err;
}

static void __devexit snd_via82xx_remove(struct pci_dev *pci)
{
      snd_card_free(pci_get_drvdata(pci));
      pci_set_drvdata(pci, NULL);
}

static struct pci_driver driver = {
      .name = "VIA 82xx Audio",
      .id_table = snd_via82xx_ids,
      .probe = snd_via82xx_probe,
      .remove = __devexit_p(snd_via82xx_remove),
#ifdef CONFIG_PM
      .suspend = snd_via82xx_suspend,
      .resume = snd_via82xx_resume,
#endif
};

static int __init alsa_card_via82xx_init(void)
{
      return pci_register_driver(&driver);
}

static void __exit alsa_card_via82xx_exit(void)
{
      pci_unregister_driver(&driver);
}

module_init(alsa_card_via82xx_init)
module_exit(alsa_card_via82xx_exit)

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