/*
   *   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/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 <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 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
  	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!
  ");
  				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)
  ", 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]
  ",
  		   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]
  ",
  				   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)
  ",
  			   (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
  ", 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
  ");

  				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
  ", 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;

  	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 = 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
  ",
  		       JOYSTICK_ADDR);

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

  		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
  ");
  			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

  			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
  ", 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
  
  ", chip->card->longname);
  	for (i = 0; i < 0xa0; i += 4) {
  		snd_iprintf(buffer, "%02x: %08x
  ", 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]
  ", 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
  ");
  		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,

  			KBUILD_MODNAME, chip)) {

  		snd_printk(KERN_ERR "unable to grab IRQ %d
  ", 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
  ",
  			    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.
  ");

  	printk(KERN_INFO "         Please try dxs_support=5 option
  ");

  	printk(KERN_INFO "         and report if it works on your machine.
  ");

  	printk(KERN_INFO "         For more details, read ALSA-Configuration.txt.
  ");

  	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
  ", 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 = KBUILD_MODNAME,

  	.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