via82xx.c

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/*
 *   ALSA driver for VIA VT82xx (South Bridge)
 *
 *   VT82C686A/B/C, VT8233A/C, VT8235
 *
 *  Copyright (c) 2000 Jaroslav Kysela <[email protected]>
 *                     Tjeerd.Mulder <[email protected]>
 *                    2002 Takashi Iwai <[email protected]>
 *
 *   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 <[email protected]>
 *  - 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 <[email protected]>
 *  - 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/module.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 <[email protected]>");
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 bool joystick;
#endif
static int ac97_clock = 48000;
static char *ac97_quirk;
static int dxs_support;
static int dxs_init_volume = 31;
static int nodelay;

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)");
module_param(dxs_init_volume, int, 0644);
MODULE_PARM_DESC(dxs_init_volume, "initial DXS volume (0-31)");
module_param(nodelay, int, 0444);
MODULE_PARM_DESC(nodelay, "Disable 500ms init delay");

/* just for backward compatibility */
static bool 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_SLEEP
    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_kcontrol *dxs_controls[4];

    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 DEFINE_PCI_DEVICE_TABLE(snd_via82xx_ids) = {
    /* 0x1106, 0x3058 */
    { PCI_VDEVICE(VIA, PCI_DEVICE_ID_VIA_82C686_5), TYPE_CARD_VIA686, },    /* 686A */
    /* 0x1106, 0x3059 */
    { PCI_VDEVICE(VIA, PCI_DEVICE_ID_VIA_8233_5), 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.. */
    if (!nodelay)
        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;
    bool use_src = false;

    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;
        use_src = true;
    } 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;

    if (use_src) {
        err = snd_pcm_hw_rule_noresample(runtime, 48000);
        if (err < 0)
            return err;
    }

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

    return 0;
}


/*
 * open callback for playback on via686
 */
static int snd_via686_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 DXS
 */
static int snd_via8233_playback_open(struct snd_pcm_substream *substream)
{
    struct via82xx *chip = snd_pcm_substream_chip(substream);
    struct viadev *viadev;
    unsigned int stream;
    int err;

    viadev = &chip->devs[chip->playback_devno + substream->number];
    if ((err = snd_via82xx_pcm_open(chip, viadev, substream)) < 0)
        return err;
    stream = viadev->reg_offset / 0x10;
    if (chip->dxs_controls[stream]) {
        chip->playback_volume[stream][0] =
                VIA_DXS_MAX_VOLUME - (dxs_init_volume & 31);
        chip->playback_volume[stream][1] =
                VIA_DXS_MAX_VOLUME - (dxs_init_volume & 31);
        chip->dxs_controls[stream]->vd[0].access &=
            ~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
        snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE |
                   SNDRV_CTL_EVENT_MASK_INFO,
                   &chip->dxs_controls[stream]->id);
    }
    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;
}

static int snd_via8233_playback_close(struct snd_pcm_substream *substream)
{
    struct via82xx *chip = snd_pcm_substream_chip(substream);
    struct viadev *viadev = substream->runtime->private_data;
    unsigned int stream;

    stream = viadev->reg_offset / 0x10;
    if (chip->dxs_controls[stream]) {
        chip->dxs_controls[stream]->vd[0].access |=
            SNDRV_CTL_ELEM_ACCESS_INACTIVE;
        snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_INFO,
                   &chip->dxs_controls[stream]->id);
    }
    return snd_via82xx_pcm_close(substream);
}


/* via686 playback callbacks */
static struct snd_pcm_ops snd_via686_playback_ops = {
    .open =     snd_via686_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_via8233_playback_open,
    .close =    snd_via8233_playback_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;
    struct snd_pcm_chmap *chmap;
    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);

    err = snd_pcm_add_chmap_ctls(pcm, SNDRV_PCM_STREAM_PLAYBACK,
                     snd_pcm_std_chmaps, 2, 0,
                     &chmap);
    if (err < 0)
        return err;

    /* 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);

    err = snd_pcm_add_chmap_ctls(pcm, SNDRV_PCM_STREAM_PLAYBACK,
                     snd_pcm_alt_chmaps, 6, 0,
                     &chmap);
    if (err < 0)
        return err;
    chip->ac97->chmaps[SNDRV_PCM_STREAM_PLAYBACK] = chmap;

    return 0;
}

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

    err = snd_pcm_add_chmap_ctls(pcm, SNDRV_PCM_STREAM_PLAYBACK,
                     snd_pcm_alt_chmaps, 6, 0,
                     &chmap);
    if (err < 0)
        return err;
    chip->ac97->chmaps[SNDRV_PCM_STREAM_PLAYBACK] = chmap;

    /* 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 = kcontrol->id.subdevice;

    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 = kcontrol->id.subdevice;
    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 = {
    .iface = SNDRV_CTL_ELEM_IFACE_PCM,
    .device = 0,
    /* .subdevice set later */
    .name = "PCM Playback Volume",
    .access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
          SNDRV_CTL_ELEM_ACCESS_TLV_READ |
          SNDRV_CTL_ELEM_ACCESS_INACTIVE,
    .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 = 0x110a,
        .subdevice = 0x0079,
        .name = "Fujitsu Siemens D1289",
        .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 */
        {
            for (i = 0; i < 4; ++i) {
                struct snd_kcontrol *kctl;

                kctl = snd_ctl_new1(
                    &snd_via8233_dxs_volume_control, chip);
                if (!kctl)
                    return -ENOMEM;
                kctl->id.subdevice = i;
                err = snd_ctl_add(chip->card, kctl);
                if (err < 0)
                    return err;
                chip->dxs_controls[i] = kctl;
            }
        }
    }
    /* 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_SLEEP
            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 |
                    MPU401_INFO_IRQ_HOOK, -1,
                    &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_SLEEP
    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_SLEEP
/*
 * power management
 */
static int snd_via82xx_suspend(struct device *dev)
{
    struct pci_dev *pci = to_pci_dev(dev);
    struct snd_card *card = dev_get_drvdata(dev);
    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_D3hot);
    return 0;
}

static int snd_via82xx_resume(struct device *dev)
{
    struct pci_dev *pci = to_pci_dev(dev);
    struct snd_card *card = dev_get_drvdata(dev);
    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;
}

static SIMPLE_DEV_PM_OPS(snd_via82xx_pm, snd_via82xx_suspend, snd_via82xx_resume);
#define SND_VIA82XX_PM_OPS  &snd_via82xx_pm
#else
#define SND_VIA82XX_PM_OPS  NULL
#endif /* CONFIG_PM_SLEEP */

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,
            KBUILD_MODNAME, 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 via82xx_driver = {
    .name = KBUILD_MODNAME,
    .id_table = snd_via82xx_ids,
    .probe = snd_via82xx_probe,
    .remove = __devexit_p(snd_via82xx_remove),
    .driver = {
        .pm = SND_VIA82XX_PM_OPS,
    },
};

module_pci_driver(via82xx_driver);