/*
 *      ite8172.c  --  ITE IT8172G Sound Driver.
 *
 * Copyright 2001 MontaVista Software Inc.
 * Author: MontaVista Software, Inc.
 *         	stevel@mvista.com or source@mvista.com
 *
 *  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  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
 *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
 *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *  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.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *
 * Module command line parameters:
 *
 *  Supported devices:
 *  /dev/dsp    standard OSS /dev/dsp device
 *  /dev/mixer  standard OSS /dev/mixer device
 *
 * Notes:
 *
 *  1. Much of the OSS buffer allocation, ioctl's, and mmap'ing are
 *     taken, slightly modified or not at all, from the ES1371 driver,
 *     so refer to the credits in es1371.c for those. The rest of the
 *     code (probe, open, read, write, the ISR, etc.) is new.
 *  2. The following support is untested:
 *      * Memory mapping the audio buffers, and the ioctl controls that go
 *        with it.
 *      * S/PDIF output.
 *  3. The following is not supported:
 *      * I2S input.
 *      * legacy audio mode.
 *  4. Support for volume button interrupts is implemented but doesn't
 *     work yet.
 *
 *  Revision history
 *    02.08.2001  0.1   Initial release
 */
#include <linux/version.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/ioport.h>
#include <linux/sched.h>
#include <linux/delay.h>
#include <linux/sound.h>
#include <linux/malloc.h>
#include <linux/soundcard.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/poll.h>
#include <linux/bitops.h>
#include <linux/proc_fs.h>
#include <linux/spinlock.h>
#include <linux/smp_lock.h>
#include <linux/ac97_codec.h>
#include <linux/wrapper.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/uaccess.h>
#include <asm/hardirq.h>
#include <asm/it8172/it8172.h>

/* --------------------------------------------------------------------- */

#undef OSS_DOCUMENTED_MIXER_SEMANTICS
#define IT8172_DEBUG
#undef IT8172_VERBOSE_DEBUG
#define DBG(x) {}

static const unsigned sample_shift[] = { 0, 1, 1, 2 };


/*
 * Audio Controller register bit definitions follow. See
 * include/asm/it8172/it8172.h for register offsets.
 */

/* PCM Out Volume Reg */
#define PCMOV_PCMOM	(1<<15)	/* PCM Out Mute default 1: mute */
#define	PCMOV_PCMRCG_BIT 8	/* PCM Right channel Gain */
#define	PCMOV_PCMRCG_MASK (0x1f<<PCMOV_PCMRCG_BIT)
#define PCMOV_PCMLCG_BIT 0	/* PCM Left channel gain  */
#define PCMOV_PCMLCG_MASK 0x1f

/* FM Out Volume Reg */
#define FMOV_FMOM       (1<<15)	/* FM Out Mute default 1: mute */
#define	FMOV_FMRCG_BIT	8	/* FM Right channel Gain */
#define	FMOV_FMRCG_MASK (0x1f<<FMOV_FMRCG_BIT)
#define FMOV_FMLCG_BIT	0	/* FM Left channel gain  */
#define FMOV_FMLCG_MASK 0x1f

/* I2S Out Volume Reg */
#define I2SV_I2SOM	 (1<<15) /* I2S Out Mute default 1: mute */
#define	I2SV_I2SRCG_BIT	 8	 /* I2S Right channel Gain */
#define	I2SV_I2SRCG_MASK (0x1f<<I2SV_I2SRCG_BIT)
#define I2SV_I2SLCG_BIT	 0	 /* I2S Left channel gain  */
#define I2SV_I2SLCG_MASK 0x1f

/* Digital Recording Source Select Reg */
#define	DRSS_BIT   0
#define	DRSS_MASK  0x07
#define   DRSS_AC97_PRIM 0
#define   DRSS_FM        1
#define   DRSS_I2S       2
#define   DRSS_PCM       3
#define   DRSS_AC97_SEC  4

/* Playback/Capture Channel Control Registers */
#define	CC_SM	        (1<<15)	/* Stereo, Mone 0: mono 1: stereo */
#define	CC_DF	        (1<<14)	/* Data Format 0: 8 bit 1: 16 bit */
#define CC_FMT_BIT      14
#define CC_FMT_MASK     (0x03<<CC_FMT_BIT)
#define CC_CF_BIT       12      /* Channel format (Playback only) */
#define CC_CF_MASK      (0x03<<CC_CF_BIT)
#define	  CC_CF_2	0
#define   CC_CF_4	(1<<CC_CF_BIT)
#define   CC_CF_6	(2<<CC_CF_BIT)
#define CC_SR_BIT       8       /* sample Rate */
#define CC_SR_MASK      (0x0f<<CC_SR_BIT)
#define	  CC_SR_5500	0
#define	  CC_SR_8000	(1<<CC_SR_BIT)
#define	  CC_SR_9600	(2<<CC_SR_BIT)
#define	  CC_SR_11025	(3<<CC_SR_BIT)
#define	  CC_SR_16000	(4<<CC_SR_BIT)
#define	  CC_SR_19200	(5<<CC_SR_BIT)
#define	  CC_SR_22050	(6<<CC_SR_BIT)
#define	  CC_SR_32000	(7<<CC_SR_BIT)
#define	  CC_SR_38400	(8<<CC_SR_BIT)
#define	  CC_SR_44100	(9<<CC_SR_BIT)
#define	  CC_SR_48000	(10<<CC_SR_BIT)
#define	CC_CSP	        (1<<7)	/* Channel stop 
				 * 0: End of Current buffer
				 * 1: Immediately stop when rec stop */
#define CC_CP	        (1<<6)	/* Channel pause 0: normal, 1: pause */
#define	CC_CA	        (1<<5)	/* Channel Action 0: Stop , 1: start */
#define	CC_CB2L         (1<<2)	/* Cur. buf. 2 xfr is last 0: No, 1: Yes */
#define CC_CB1L         (1<<1)	/* Cur. buf. 1 xfr is last 0: No, 1: Yes */
#define CC_DE	        1	/* DFC/DFIFO Data Empty 1: empty, 0: not empty
				 * (Playback only)
				 */

/* Codec Control Reg */
#define CODECC_GME	(1<<9)	/* AC97 GPIO Mode enable */
#define	CODECC_ATM	(1<<8)	/* AC97 ATE test mode 0: test 1: normal */
#define	CODECC_WR	(1<<6)	/* AC97 Warn reset 1: warm reset , 0: Normal */
#define	CODECC_CR	(1<<5)	/* AC97 Cold reset 1: Cold reset , 0: Normal */


/* I2S Control Reg	*/
#define	I2SMC_SR_BIT	 6	/* I2S Sampling rate 
				 * 00: 48KHz, 01: 44.1 KHz, 10: 32 32 KHz */
#define	I2SMC_SR_MASK    (0x03<<I2SMC_SR_BIT)
#define	  I2SMC_SR_48000 0
#define	  I2SMC_SR_44100 (1<<I2SMC_SR_BIT)
#define	  I2SMC_SR_32000 (2<<I2SMC_SR_BIT)
#define	I2SMC_SRSS	 (1<<5)	/* Sample Rate Source Select 1:S/W, 0: H/W */
#define I2SMC_I2SF_BIT	 0	/* I2S Format */
#define I2SMC_I2SF_MASK  0x03
#define   I2SMC_I2SF_DAC 0
#define   I2SMC_I2SF_ADC 2
#define   I2SMC_I2SF_I2S 3


/* Volume up, Down, Mute */
#define	VS_VMP	(1<<2)	/* Volume mute 1: pushed, 0: not */
#define	VS_VDP	(1<<1)	/* Volume Down 1: pushed, 0: not */
#define VS_VUP	1	/* Volime Up 1: pushed, 0: not */

/* SRC, Mixer test control/DFC status reg */
#define SRCS_DPUSC      (1<<5)	/* DFC Playback underrun Status/clear */
#define	SRCS_DCOSC	(1<<4)	/* DFC Capture Overrun Status/clear */
#define SRCS_SIS	(1<<3)	/* SRC input select 1: Mixer, 0: Codec I/F */
#define SRCS_CDIS_BIT	0	/* Codec Data Input Select */
#define SRCS_CDIS_MASK  0x07
#define   SRCS_CDIS_MIXER 0
#define   SRCS_CDIS_PCM   1
#define   SRCS_CDIS_I2S   2
#define   SRCS_CDIS_FM    3
#define   SRCS_CDIS_DFC   4


/* Codec Index Reg command Port */
#define CIRCP_CID_BIT   10
#define CIRCP_CID_MASK  (0x03<<CIRCP_CID_BIT)
#define CIRCP_CPS	(1<<9)	/* Command Port Status 0: ready, 1: busy */
#define	CIRCP_DPVF	(1<<8)	/* Data Port Valid Flag 0: invalis, 1: valid */
#define CIRCP_RWC	(1<<7)	/* Read/write command */
#define CIRCP_CIA_BIT   0
#define CIRCP_CIA_MASK  0x007F	/* Codec Index Address */

/* Test Mode Control/Test group Select Control */

/* General Control Reg */
#define GC_VDC_BIT	6	/* Volume Division Control */
#define GC_VDC_MASK     (0x03<<GC_VDC_BIT)
#define   GC_VDC_NONE   0
#define   GC_VDC_DIV2   (1<<GC_VDC_BIT)
#define   GC_VDC_DIV4   (2<<GC_VDC_BIT)
#define	GC_SOE	        (1<<2)	/* S/PDIF Output enable */
#define	GC_SWR	        1	/* Software warn reset */

/* Interrupt mask Control Reg */
#define	IMC_VCIM	(1<<6)	/* Volume CNTL interrupt mask */
#define	IMC_CCIM	(1<<1)	/* Capture Chan. iterrupt mask */
#define	IMC_PCIM	1	/* Playback Chan. interrupt mask */

/* Interrupt status/clear reg */
#define	ISC_VCI	        (1<<6)	/* Volume CNTL interrupt 1: clears */
#define	ISC_CCI	        (1<<1)	/* Capture Chan. interrupt 1: clears  */
#define	ISC_PCI	        1	/* Playback Chan. interrupt 1: clears */

/* misc stuff */
#define POLL_COUNT   0x5000


#define IT8172_MODULE_NAME "IT8172 audio"
#define PFX IT8172_MODULE_NAME ": "


/* --------------------------------------------------------------------- */

struct it8172_state {
    /* list of it8172 devices */
    struct list_head devs;

    /* the corresponding pci_dev structure */
    struct pci_dev *dev;

    /* soundcore stuff */
    int dev_audio;

    /* hardware resources */
    unsigned long io;
    unsigned int irq;

    /* PCI ID's */
    u16 vendor;
    u16 device;
    u8 rev; /* the chip revision */

    /* options */
    int spdif_volume; /* S/PDIF output is enabled if != -1 */

#ifdef IT8172_DEBUG
    /* debug /proc entry */
    struct proc_dir_entry *ps;
    struct proc_dir_entry *ac97_ps;
#endif /* IT8172_DEBUG */

    struct ac97_codec codec;

    unsigned short pcc, capcc;
    unsigned dacrate, adcrate;

    spinlock_t lock;
    struct semaphore open_sem;
    mode_t open_mode;
    wait_queue_head_t open_wait;

    struct dmabuf {
	void *rawbuf;
	dma_addr_t dmaaddr;
	unsigned buforder;
	unsigned numfrag;
	unsigned fragshift;
	void* nextIn;
	void* nextOut;
	int count;
	int curBufPtr;
	unsigned total_bytes;
	unsigned error; /* over/underrun */
	wait_queue_head_t wait;
	/* redundant, but makes calculations easier */
	unsigned fragsize;
	unsigned dmasize;
	unsigned fragsamples;
	/* OSS stuff */
	unsigned mapped:1;
	unsigned ready:1;
	unsigned stopped:1;
	unsigned ossfragshift;
	int ossmaxfrags;
	unsigned subdivision;
    } dma_dac, dma_adc;
};

/* --------------------------------------------------------------------- */

static LIST_HEAD(devs);

/* --------------------------------------------------------------------- */

extern inline unsigned ld2(unsigned int x)
{
    unsigned r = 0;
	
    if (x >= 0x10000) {
	x >>= 16;
	r += 16;
    }
    if (x >= 0x100) {
	x >>= 8;
	r += 8;
    }
    if (x >= 0x10) {
	x >>= 4;
	r += 4;
    }
    if (x >= 4) {
	x >>= 2;
	r += 2;
    }
    if (x >= 2)
	r++;
    return r;
}

/* --------------------------------------------------------------------- */

static void it8172_delay(int msec)
{
    unsigned long tmo;
    signed long tmo2;

    if (in_interrupt())
	return;
    
    tmo = jiffies + (msec*HZ)/1000;
    for (;;) {
	tmo2 = tmo - jiffies;
	if (tmo2 <= 0)
	    break;
	schedule_timeout(tmo2);
    }
}


static unsigned short
get_compat_rate(unsigned* rate)
{
    unsigned rate_out = *rate;
    unsigned short sr;
    
    if (rate_out >= 46050) {
	sr = CC_SR_48000; rate_out = 48000;
    } else if (rate_out >= 41250) {
	sr = CC_SR_44100; rate_out = 44100;
    } else if (rate_out >= 35200) {
	sr = CC_SR_38400; rate_out = 38400;
    } else if (rate_out >= 27025) {
	sr = CC_SR_32000; rate_out = 32000;
    } else if (rate_out >= 20625) {
	sr = CC_SR_22050; rate_out = 22050;
    } else if (rate_out >= 17600) {
	sr = CC_SR_19200; rate_out = 19200;
    } else if (rate_out >= 13513) {
	sr = CC_SR_16000; rate_out = 16000;
    } else if (rate_out >= 10313) {
	sr = CC_SR_11025; rate_out = 11025;
    } else if (rate_out >= 8800) {
	sr = CC_SR_9600; rate_out = 9600;
    } else if (rate_out >= 6750) {
	sr = CC_SR_8000; rate_out = 8000;
    } else {
	sr = CC_SR_5500; rate_out = 5500;
    }

    *rate = rate_out;
    return sr;
}

static void set_adc_rate(struct it8172_state *s, unsigned rate)
{
    unsigned long flags;
    unsigned short sr;
    
    sr = get_compat_rate(&rate);

    spin_lock_irqsave(&s->lock, flags);
    s->capcc &= ~CC_SR_MASK;
    s->capcc |= sr;
    outw(s->capcc, s->io+IT_AC_CAPCC);
    spin_unlock_irqrestore(&s->lock, flags);

    s->adcrate = rate;
}


static void set_dac_rate(struct it8172_state *s, unsigned rate)
{
    unsigned long flags;
    unsigned short sr;
    
    sr = get_compat_rate(&rate);

    spin_lock_irqsave(&s->lock, flags);
    s->pcc &= ~CC_SR_MASK;
    s->pcc |= sr;
    outw(s->pcc, s->io+IT_AC_PCC);
    spin_unlock_irqrestore(&s->lock, flags);

    s->dacrate = rate;
}


/* --------------------------------------------------------------------- */

static u16 rdcodec(struct ac97_codec *codec, u8 addr)
{
    struct it8172_state *s = (struct it8172_state *)codec->private_data;
    unsigned long flags;
    unsigned short circp, data;
    int i;
    
    spin_lock_irqsave(&s->lock, flags);

    for (i = 0; i < POLL_COUNT; i++)
	if (!(inw(s->io+IT_AC_CIRCP) & CIRCP_CPS))
	    break;
    if (i == POLL_COUNT)
	printk(KERN_INFO PFX "rdcodec: codec ready poll expired!\n");

    circp = addr & CIRCP_CIA_MASK;
    circp |= (codec->id << CIRCP_CID_BIT);
    circp |= CIRCP_RWC; // read command
    outw(circp, s->io+IT_AC_CIRCP);

    /* now wait for the data */
    for (i = 0; i < POLL_COUNT; i++)
	if (inw(s->io+IT_AC_CIRCP) & CIRCP_DPVF)
	    break;
    if (i == POLL_COUNT)
	printk(KERN_INFO PFX "rdcodec: read poll expired!\n");

    data = inw(s->io+IT_AC_CIRDP);
    spin_unlock_irqrestore(&s->lock, flags);

    return data;
}


static void wrcodec(struct ac97_codec *codec, u8 addr, u16 data)
{
    struct it8172_state *s = (struct it8172_state *)codec->private_data;
    unsigned long flags;
    unsigned short circp;
    int i;
    
    spin_lock_irqsave(&s->lock, flags);

    for (i = 0; i < POLL_COUNT; i++)
	if (!(inw(s->io+IT_AC_CIRCP) & CIRCP_CPS))
	    break;
    if (i == POLL_COUNT)
	printk(KERN_INFO PFX "wrcodec: codec ready poll expired!\n");

    circp = addr & CIRCP_CIA_MASK;
    circp |= (codec->id << CIRCP_CID_BIT);
    circp &= ~CIRCP_RWC; // write command

    outw(data,  s->io+IT_AC_CIRDP);  // send data first
    outw(circp, s->io+IT_AC_CIRCP);

    spin_unlock_irqrestore(&s->lock, flags);
}


static void waitcodec(struct ac97_codec *codec)
{
    unsigned short temp;

    /* codec_wait is used to wait for a ready state after
       an AC97_RESET. */
    it8172_delay(10);

    temp = rdcodec(codec, 0x26);

    // If power down, power up
    if (temp & 0x3f00) {
	// Power on
	wrcodec(codec, 0x26, 0);
	it8172_delay(100);
	// Reread
	temp = rdcodec(codec, 0x26);
    }
    
    // Check if Codec REF,ANL,DAC,ADC ready***/
    if ((temp & 0x3f0f) != 0x000f) {
	printk(KERN_INFO PFX "codec reg 26 status (0x%x) not ready!!\n",
	       temp);
	return;
    }
}


/* --------------------------------------------------------------------- */

extern inline void stop_adc(struct it8172_state *s)
{
    struct dmabuf* db = &s->dma_adc;
    unsigned long flags;
    unsigned char imc;
    
    if (db->stopped)
	return;

    spin_lock_irqsave(&s->lock, flags);

    s->capcc &= ~(CC_CA | CC_CP | CC_CB2L | CC_CB1L);
    s->capcc |= CC_CSP;
    outw(s->capcc, s->io+IT_AC_CAPCC);
    
    // disable capture interrupt
    imc = inb(s->io+IT_AC_IMC);
    outb(imc | IMC_CCIM, s->io+IT_AC_IMC);

    db->stopped = 1;

    spin_unlock_irqrestore(&s->lock, flags);
}	

extern inline void stop_dac(struct it8172_state *s)
{
    struct dmabuf* db = &s->dma_dac;
    unsigned long flags;
    unsigned char imc;
    
    if (db->stopped)
	return;

    spin_lock_irqsave(&s->lock, flags);

    s->pcc &= ~(CC_CA | CC_CP | CC_CB2L | CC_CB1L);
    s->pcc |= CC_CSP;
    outw(s->pcc, s->io+IT_AC_PCC);
    
    // disable playback interrupt
    imc = inb(s->io+IT_AC_IMC);
    outb(imc | IMC_PCIM, s->io+IT_AC_IMC);

    db->stopped = 1;
    
    spin_unlock_irqrestore(&s->lock, flags);
}	

static void start_dac(struct it8172_state *s)
{
    struct dmabuf* db = &s->dma_dac;
    unsigned long flags;
    unsigned char imc;
    unsigned long buf1, buf2;
    
    if (!db->stopped)
	return;
    
    spin_lock_irqsave(&s->lock, flags);

    // reset Buffer 1 and 2 pointers to nextOut and nextOut+fragsize
    buf1 = virt_to_bus(db->nextOut);
    buf2 = buf1 + db->fragsize;
    if (buf2 >= db->dmaaddr + db->dmasize)
	buf2 -= db->dmasize;
    
    outl(buf1, s->io+IT_AC_PCB1STA);
    outl(buf2, s->io+IT_AC_PCB2STA);
    db->curBufPtr = IT_AC_PCB1STA;
    
    // enable playback interrupt
    imc = inb(s->io+IT_AC_IMC);
    outb(imc & ~IMC_PCIM, s->io+IT_AC_IMC);

    s->pcc &= ~(CC_CSP | CC_CP | CC_CB2L | CC_CB1L);
    s->pcc |= CC_CA;
    outw(s->pcc, s->io+IT_AC_PCC);
    
    db->stopped = 0;

    spin_unlock_irqrestore(&s->lock, flags);
}	

static void start_adc(struct it8172_state *s)
{
    struct dmabuf* db = &s->dma_adc;
    unsigned long flags;
    unsigned char imc;
    unsigned long buf1, buf2;
    
    if (!db->stopped)
	return;

    spin_lock_irqsave(&s->lock, flags);

    // reset Buffer 1 and 2 pointers to nextIn and nextIn+fragsize
    buf1 = virt_to_bus(db->nextIn);
    buf2 = buf1 + db->fragsize;
    if (buf2 >= db->dmaaddr + db->dmasize)
	buf2 -= db->dmasize;
    
    outl(buf1, s->io+IT_AC_CAPB1STA);
    outl(buf2, s->io+IT_AC_CAPB2STA);
    db->curBufPtr = IT_AC_CAPB1STA;

    // enable capture interrupt
    imc = inb(s->io+IT_AC_IMC);
    outb(imc & ~IMC_CCIM, s->io+IT_AC_IMC);

    s->capcc &= ~(CC_CSP | CC_CP | CC_CB2L | CC_CB1L);
    s->capcc |= CC_CA;
    outw(s->capcc, s->io+IT_AC_CAPCC);
    
    db->stopped = 0;

    spin_unlock_irqrestore(&s->lock, flags);
}	

/* --------------------------------------------------------------------- */

#define DMABUF_DEFAULTORDER (17-PAGE_SHIFT)
#define DMABUF_MINORDER 1

extern inline void dealloc_dmabuf(struct it8172_state *s, struct dmabuf *db)
{
    struct page *page, *pend;

    if (db->rawbuf) {
	/* undo marking the pages as reserved */
	pend = virt_to_page(db->rawbuf + (PAGE_SIZE << db->buforder) - 1);
	for (page = virt_to_page(db->rawbuf); page <= pend; page++)
	    mem_map_unreserve(page);
	pci_free_consistent(s->dev, PAGE_SIZE << db->buforder,
			    db->rawbuf, db->dmaaddr);
    }
    db->rawbuf = db->nextIn = db->nextOut = NULL;
    db->mapped = db->ready = 0;
}

static int prog_dmabuf(struct it8172_state *s, struct dmabuf *db,
		       unsigned rate, unsigned fmt, unsigned reg)
{
    int order;
    unsigned bytepersec;
    unsigned bufs;
    struct page *page, *pend;

    if (!db->rawbuf) {
	db->ready = db->mapped = 0;
	for (order = DMABUF_DEFAULTORDER; order >= DMABUF_MINORDER; order--)
	    if ((db->rawbuf = pci_alloc_consistent(s->dev,
						   PAGE_SIZE << order,
						   &db->dmaaddr)))
		break;
	if (!db->rawbuf)
	    return -ENOMEM;
	db->buforder = order;
	/* now mark the pages as reserved;
	   otherwise remap_page_range doesn't do what we want */
	pend = virt_to_page(db->rawbuf + (PAGE_SIZE << db->buforder) - 1);
	for (page = virt_to_page(db->rawbuf); page <= pend; page++)
	    mem_map_reserve(page);
    }

    db->count = 0;
    db->nextIn = db->nextOut = db->rawbuf;
    
    bytepersec = rate << sample_shift[fmt];
    bufs = PAGE_SIZE << db->buforder;
    if (db->ossfragshift) {
	if ((1000 << db->ossfragshift) < bytepersec)
	    db->fragshift = ld2(bytepersec/1000);
	else
	    db->fragshift = db->ossfragshift;
    } else {
	db->fragshift = ld2(bytepersec/100/(db->subdivision ?
					    db->subdivision : 1));
	if (db->fragshift < 3)
	    db->fragshift = 3;
    }
    db->numfrag = bufs >> db->fragshift;
    while (db->numfrag < 4 && db->fragshift > 3) {
	db->fragshift--;
	db->numfrag = bufs >> db->fragshift;
    }
    db->fragsize = 1 << db->fragshift;
    if (db->ossmaxfrags >= 4 && db->ossmaxfrags < db->numfrag)
	db->numfrag = db->ossmaxfrags;
    db->fragsamples = db->fragsize >> sample_shift[fmt];
    db->dmasize = db->numfrag << db->fragshift;
    memset(db->rawbuf, (fmt & (CC_DF>>CC_FMT_BIT)) ? 0 : 0x80, db->dmasize);
    
    // set data length register
    outw(db->fragsize, s->io+reg+2);
    db->ready = 1;

    return 0;
}

extern inline int prog_dmabuf_adc(struct it8172_state *s)
{
    stop_adc(s);
    return prog_dmabuf(s, &s->dma_adc, s->adcrate,
		       (s->capcc & CC_FMT_MASK) >> CC_FMT_BIT,
		       IT_AC_CAPCC);
}

extern inline int prog_dmabuf_dac(struct it8172_state *s)
{
    stop_dac(s);
    return prog_dmabuf(s, &s->dma_dac, s->dacrate,
		       (s->pcc & CC_FMT_MASK) >> CC_FMT_BIT,
		       IT_AC_PCC);
}


/* hold spinlock for the following! */

static void it8172_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
    struct it8172_state *s = (struct it8172_state *)dev_id;
    struct dmabuf* dac = &s->dma_dac;
    struct dmabuf* adc = &s->dma_adc;
    unsigned char isc, vs;
    unsigned short vol, mute;
    unsigned long newptr;
    
    spin_lock(&s->lock);

    isc = inb(s->io+IT_AC_ISC);

    /* fastpath out, to ease interrupt sharing */
    if (!(isc & (ISC_VCI | ISC_CCI | ISC_PCI)))
	return;

    /* clear audio interrupts first */
    outb(isc | ISC_VCI | ISC_CCI | ISC_PCI, s->io+IT_AC_ISC);
    
    /* handle volume button events */
    if (isc & ISC_VCI) {
	vs = inb(s->io+IT_AC_VS);
	outb(0, s->io+IT_AC_VS);
	vol = inw(s->io+IT_AC_PCMOV);
	mute = vol & PCMOV_PCMOM;
	vol &= PCMOV_PCMLCG_MASK;
	if ((vs & VS_VUP) && vol > 0)
	    vol--;
	if ((vs & VS_VDP) && vol < 0x1f)
	    vol++;
	vol |= (vol << PCMOV_PCMRCG_BIT);
	if (vs & VS_VMP)
	    vol |= (mute ^ PCMOV_PCMOM);
	outw(vol, s->io+IT_AC_PCMOV);
    }
    
    /* update capture pointers */
    if (isc & ISC_CCI) {
	if (adc->count > adc->dmasize - adc->fragsize) {
	    // Overrun. Stop ADC and log the error
	    stop_adc(s);
	    adc->error++;
	    printk(KERN_INFO PFX "adc overrun\n");
	} else {
	    newptr = virt_to_bus(adc->nextIn) + 2*adc->fragsize;
	    if (newptr >= adc->dmaaddr + adc->dmasize)
		newptr -= adc->dmasize;
	    
	    outl(newptr, s->io+adc->curBufPtr);
	    adc->curBufPtr = (adc->curBufPtr == IT_AC_CAPB1STA) ?
		IT_AC_CAPB2STA : IT_AC_CAPB1STA;
	    
	    adc->nextIn += adc->fragsize;
	    if (adc->nextIn >= adc->rawbuf + adc->dmasize)
		adc->nextIn -= adc->dmasize;
	    
	    adc->count += adc->fragsize;
	    adc->total_bytes += adc->fragsize;

	    /* wake up anybody listening */
	    if (waitqueue_active(&adc->wait))
		wake_up_interruptible(&adc->wait);
	}
    }
    
    /* update playback pointers */
    if (isc & ISC_PCI) {
	newptr = virt_to_bus(dac->nextOut) + 2*dac->fragsize;
	if (newptr >= dac->dmaaddr + dac->dmasize)
	    newptr -= dac->dmasize;
	
	outl(newptr, s->io+dac->curBufPtr);
	dac->curBufPtr = (dac->curBufPtr == IT_AC_PCB1STA) ?
	    IT_AC_PCB2STA : IT_AC_PCB1STA;
	
	dac->nextOut += dac->fragsize;
	if (dac->nextOut >= dac->rawbuf + dac->dmasize)
	    dac->nextOut -= dac->dmasize;
	
	dac->count -= dac->fragsize;
	dac->total_bytes += dac->fragsize;

	/* wake up anybody listening */
	if (waitqueue_active(&dac->wait))
	    wake_up_interruptible(&dac->wait);
	
	if (dac->count <= 0)
	    stop_dac(s);
    }
    
    spin_unlock(&s->lock);
}

/* --------------------------------------------------------------------- */

static loff_t it8172_llseek(struct file *file, loff_t offset, int origin)
{
    return -ESPIPE;
}


static int it8172_open_mixdev(struct inode *inode, struct file *file)
{
    int minor = MINOR(inode->i_rdev);
    struct list_head *list;
    struct it8172_state *s;

    for (list = devs.next; ; list = list->next) {
	if (list == &devs)
	    return -ENODEV;
	s = list_entry(list, struct it8172_state, devs);
	if (s->codec.dev_mixer == minor)
	    break;
    }
    file->private_data = s;
    return 0;
}

static int it8172_release_mixdev(struct inode *inode, struct file *file)
{
    return 0;
}


static int mixdev_ioctl(struct ac97_codec *codec, unsigned int cmd,
			unsigned long arg)
{
    return codec->mixer_ioctl(codec, cmd, arg);
}

static int it8172_ioctl_mixdev(struct inode *inode, struct file *file,
			       unsigned int cmd, unsigned long arg)
{
    struct it8172_state *s = (struct it8172_state *)file->private_data;
    struct ac97_codec *codec = &s->codec;

    return mixdev_ioctl(codec, cmd, arg);
}

static /*const*/ struct file_operations it8172_mixer_fops = {
    owner:	THIS_MODULE,
    llseek:	it8172_llseek,
    ioctl:	it8172_ioctl_mixdev,
    open:	it8172_open_mixdev,
    release:	it8172_release_mixdev,
};

/* --------------------------------------------------------------------- */

static int drain_dac(struct it8172_state *s, int nonblock)
{
    unsigned long flags;
    int count, tmo;
	
    if (s->dma_dac.mapped || !s->dma_dac.ready)
	return 0;

    for (;;) {
	spin_lock_irqsave(&s->lock, flags);
	count = s->dma_dac.count;
	spin_unlock_irqrestore(&s->lock, flags);
	if (count <= 0)
	    break;
	if (signal_pending(current))
	    break;
	if (nonblock)
	    return -EBUSY;
	tmo = 1000 * count / s->dacrate;
	tmo >>= sample_shift[(s->pcc & CC_FMT_MASK) >> CC_FMT_BIT];
	it8172_delay(tmo);
    }
    if (signal_pending(current))
	return -ERESTARTSYS;
    return 0;
}

/* --------------------------------------------------------------------- */

static ssize_t it8172_read(struct file *file, char *buffer,
			   size_t count, loff_t *ppos)
{
    struct it8172_state *s = (struct it8172_state *)file->private_data;
    struct dmabuf *db = &s->dma_adc;
    ssize_t ret;
    unsigned long flags;
    int cnt, bufcnt, avail;

    if (ppos != &file->f_pos)
	return -ESPIPE;
    if (db->mapped)
	return -ENXIO;
    if (!access_ok(VERIFY_WRITE, buffer, count))
	return -EFAULT;
    ret = 0;

    while (count > 0) {
	// wait for samples in capture buffer
	do {
	    spin_lock_irqsave(&s->lock, flags);
	    if (db->stopped)
		start_adc(s);
	    avail = db->count;
	    spin_unlock_irqrestore(&s->lock, flags);
	    if (avail <= 0) {
		if (file->f_flags & O_NONBLOCK) {
		    if (!ret)
			ret = -EAGAIN;
		    return ret;
		}
		interruptible_sleep_on(&db->wait);
		if (signal_pending(current)) {
		    if (!ret)
			ret = -ERESTARTSYS;
		    return ret;
		}
	    }
	} while (avail <= 0);

	cnt = count > avail ? avail : count;
	bufcnt = cnt;
	if (cnt % db->fragsize) {
	    // round count up to nearest fragment
	    int newcnt = db->fragsize * ((cnt + db->fragsize) / db->fragsize);
	    cnt = newcnt;
	}

	// copy from nextOut to user
	if (copy_to_user(buffer, db->nextOut, bufcnt)) {
	    if (!ret)
		ret = -EFAULT;
	    return ret;
	}

	spin_lock_irqsave(&s->lock, flags);
	db->count -= cnt;
	spin_unlock_irqrestore(&s->lock, flags);

	db->nextOut += cnt;
	if (db->nextOut >= db->rawbuf + db->dmasize)
	    db->nextOut -= db->dmasize;	

	count -= bufcnt;
	buffer += bufcnt;
	ret += bufcnt;
    } // while (count > 0)

    return ret;
}

static ssize_t it8172_write(struct file *file, const char *buffer,
			    size_t count, loff_t *ppos)
{
    struct it8172_state *s = (struct it8172_state *)file->private_data;
    struct dmabuf *db = &s->dma_dac;
    ssize_t ret;
    unsigned long flags;
    int cnt, bufcnt, avail;

    if (ppos != &file->f_pos)
	return -ESPIPE;
    if (db->mapped)
	return -ENXIO;
    if (!access_ok(VERIFY_READ, buffer, count))
	return -EFAULT;
    ret = 0;
    
    while (count > 0) {
	// wait for space in playback buffer
	do {
	    spin_lock_irqsave(&s->lock, flags);
	    avail = db->dmasize - db->count;
	    spin_unlock_irqrestore(&s->lock, flags);
	    if (avail <= 0) {
		if (file->f_flags & O_NONBLOCK) {
		    if (!ret)
			ret = -EAGAIN;
		    return ret;
		}
		interruptible_sleep_on(&db->wait);
		if (signal_pending(current)) {
		    if (!ret)
			ret = -ERESTARTSYS;
		    return ret;
		}
	    }
	} while (avail <= 0);
	
	cnt = count > avail ? avail : count;
	// copy to nextIn
	if (copy_from_user(db->nextIn, buffer, cnt)) {
	    if (!ret)
		ret = -EFAULT;
	    return ret;
	}

	bufcnt = cnt;
	if (cnt % db->fragsize) {
	    // round count up to nearest fragment, and fill remainder of
	    // fragment with silence
	    int newcnt = db->fragsize * ((cnt + db->fragsize) / db->fragsize);
	    memset(db->nextIn + cnt, (s->pcc & CC_DF) ? 0 : 0x80, newcnt - cnt);
	    cnt = newcnt;
	}

	spin_lock_irqsave(&s->lock, flags);
	db->count += cnt;
	if (db->stopped)
	    start_dac(s);
	spin_unlock_irqrestore(&s->lock, flags);
	
	db->nextIn += cnt;
	if (db->nextIn >= db->rawbuf + db->dmasize)
	    db->nextIn -= db->dmasize;
	
	count -= bufcnt;
	buffer += bufcnt;
	ret += bufcnt;
    } // while (count > 0)
	
    return ret;
}

/* No kernel lock - we have our own spinlock */
static unsigned int it8172_poll(struct file *file,
				struct poll_table_struct *wait)
{
    struct it8172_state *s = (struct it8172_state *)file->private_data;
    unsigned long flags;
    unsigned int mask = 0;

    if (file->f_mode & FMODE_WRITE)
	poll_wait(file, &s->dma_dac.wait, wait);
    if (file->f_mode & FMODE_READ)
	poll_wait(file, &s->dma_adc.wait, wait);
    spin_lock_irqsave(&s->lock, flags);
    if (file->f_mode & FMODE_READ) {
	if (s->dma_adc.count >= (signed)s->dma_adc.fragsize)
	    mask |= POLLIN | POLLRDNORM;
    }
    if (file->f_mode & FMODE_WRITE) {
	if (s->dma_dac.mapped) {
	    if (s->dma_dac.count >= (signed)s->dma_dac.fragsize) 
		mask |= POLLOUT | POLLWRNORM;
	} else {
	    if ((signed)s->dma_dac.dmasize >=
		s->dma_dac.count + (signed)s->dma_dac.fragsize)
		mask |= POLLOUT | POLLWRNORM;
	}
    }
    spin_unlock_irqrestore(&s->lock, flags);
    return mask;
}

static int it8172_mmap(struct file *file, struct vm_area_struct *vma)
{
    struct it8172_state *s = (struct it8172_state *)file->private_data;
    struct dmabuf *db;
    unsigned long size;

    lock_kernel();
    if (vma->vm_flags & VM_WRITE)
	db = &s->dma_dac;
    else if (vma->vm_flags & VM_READ)
	db = &s->dma_adc;
    else {
	unlock_kernel();
	return -EINVAL;
    }
    if (vma->vm_pgoff != 0) {
	unlock_kernel();
	return -EINVAL;
    }
    size = vma->vm_end - vma->vm_start;
    if (size > (PAGE_SIZE << db->buforder)) {
	unlock_kernel();
	return -EINVAL;
    }
    if (remap_page_range(vma->vm_start, virt_to_phys(db->rawbuf),
			 size, vma->vm_page_prot)) {
	unlock_kernel();
	return -EAGAIN;
    }
    db->mapped = 1;
    unlock_kernel();
    return 0;
}


#ifdef IT8172_VERBOSE_DEBUG
static struct ioctl_str_t {
    unsigned int cmd;
    const char* str;
} ioctl_str[] = {
    {SNDCTL_DSP_RESET, "SNDCTL_DSP_RESET"},
    {SNDCTL_DSP_SYNC, "SNDCTL_DSP_SYNC"},
    {SNDCTL_DSP_SPEED, "SNDCTL_DSP_SPEED"},
    {SNDCTL_DSP_STEREO, "SNDCTL_DSP_STEREO"},
    {SNDCTL_DSP_GETBLKSIZE, "SNDCTL_DSP_GETBLKSIZE"},
    {SNDCTL_DSP_SAMPLESIZE, "SNDCTL_DSP_SAMPLESIZE"},
    {SNDCTL_DSP_CHANNELS, "SNDCTL_DSP_CHANNELS"},
    {SOUND_PCM_WRITE_CHANNELS, "SOUND_PCM_WRITE_CHANNELS"},
    {SOUND_PCM_WRITE_FILTER, "SOUND_PCM_WRITE_FILTER"},
    {SNDCTL_DSP_POST, "SNDCTL_DSP_POST"},
    {SNDCTL_DSP_SUBDIVIDE, "SNDCTL_DSP_SUBDIVIDE"},
    {SNDCTL_DSP_SETFRAGMENT, "SNDCTL_DSP_SETFRAGMENT"},
    {SNDCTL_DSP_GETFMTS, "SNDCTL_DSP_GETFMTS"},
    {SNDCTL_DSP_SETFMT, "SNDCTL_DSP_SETFMT"},
    {SNDCTL_DSP_GETOSPACE, "SNDCTL_DSP_GETOSPACE"},
    {SNDCTL_DSP_GETISPACE, "SNDCTL_DSP_GETISPACE"},
    {SNDCTL_DSP_NONBLOCK, "SNDCTL_DSP_NONBLOCK"},
    {SNDCTL_DSP_GETCAPS, "SNDCTL_DSP_GETCAPS"},
    {SNDCTL_DSP_GETTRIGGER, "SNDCTL_DSP_GETTRIGGER"},
    {SNDCTL_DSP_SETTRIGGER, "SNDCTL_DSP_SETTRIGGER"},
    {SNDCTL_DSP_GETIPTR, "SNDCTL_DSP_GETIPTR"},
    {SNDCTL_DSP_GETOPTR, "SNDCTL_DSP_GETOPTR"},
    {SNDCTL_DSP_MAPINBUF, "SNDCTL_DSP_MAPINBUF"},
    {SNDCTL_DSP_MAPOUTBUF, "SNDCTL_DSP_MAPOUTBUF"},
    {SNDCTL_DSP_SETSYNCRO, "SNDCTL_DSP_SETSYNCRO"},
    {SNDCTL_DSP_SETDUPLEX, "SNDCTL_DSP_SETDUPLEX"},
    {SNDCTL_DSP_GETODELAY, "SNDCTL_DSP_GETODELAY"},
    {SNDCTL_DSP_GETCHANNELMASK, "SNDCTL_DSP_GETCHANNELMASK"},
    {SNDCTL_DSP_BIND_CHANNEL, "SNDCTL_DSP_BIND_CHANNEL"},
    {OSS_GETVERSION, "OSS_GETVERSION"},
    {SOUND_PCM_READ_RATE, "SOUND_PCM_READ_RATE"},
    {SOUND_PCM_READ_CHANNELS, "SOUND_PCM_READ_CHANNELS"},
    {SOUND_PCM_READ_BITS, "SOUND_PCM_READ_BITS"},
    {SOUND_PCM_READ_FILTER, "SOUND_PCM_READ_FILTER"}
};
#endif    

static int it8172_ioctl(struct inode *inode, struct file *file,
			unsigned int cmd, unsigned long arg)
{
    struct it8172_state *s = (struct it8172_state *)file->private_data;
    unsigned long flags;
    audio_buf_info abinfo;
    count_info cinfo;
    int count;
    int val, mapped, ret, diff;

    mapped = ((file->f_mode & FMODE_WRITE) && s->dma_dac.mapped) ||
	((file->f_mode & FMODE_READ) && s->dma_adc.mapped);

#ifdef IT8172_VERBOSE_DEBUG
    for (count=0; count<sizeof(ioctl_str)/sizeof(ioctl_str[0]); count++) {
	if (ioctl_str[count].cmd == cmd)
	    break;
    }
    if (count < sizeof(ioctl_str)/sizeof(ioctl_str[0]))
	printk(KERN_INFO PFX "ioctl %s\n", ioctl_str[count].str);
    else
	printk(KERN_INFO PFX "ioctl unknown, 0x%x\n", cmd);
#endif
    
    switch (cmd) {
    case OSS_GETVERSION:
	return put_user(SOUND_VERSION, (int *)arg);

    case SNDCTL_DSP_SYNC:
	if (file->f_mode & FMODE_WRITE)
	    return drain_dac(s, file->f_flags & O_NONBLOCK);
	return 0;
		
    case SNDCTL_DSP_SETDUPLEX:
	return 0;

    case SNDCTL_DSP_GETCAPS:
	return put_user(DSP_CAP_DUPLEX | DSP_CAP_REALTIME |
			DSP_CAP_TRIGGER | DSP_CAP_MMAP, (int *)arg);
		
    case SNDCTL_DSP_RESET:
	if (file->f_mode & FMODE_WRITE) {
	    stop_dac(s);
	    synchronize_irq();
	    s->dma_dac.count = s->dma_dac.total_bytes = 0;
	    s->dma_dac.nextIn = s->dma_dac.nextOut = s->dma_dac.rawbuf;
	}
	if (file->f_mode & FMODE_READ) {
	    stop_adc(s);
	    synchronize_irq();
	    s->dma_adc.count = s->dma_adc.total_bytes = 0;
	    s->dma_adc.nextIn = s->dma_adc.nextOut = s->dma_adc.rawbuf;
	}
	return 0;

    case SNDCTL_DSP_SPEED:
	if (get_user(val, (int *)arg))
	    return -EFAULT;
	if (val >= 0) {
	    if (file->f_mode & FMODE_READ) {
		stop_adc(s);
		set_adc_rate(s, val);
		if ((ret = prog_dmabuf_adc(s)))
		    return ret;
	    }
	    if (file->f_mode & FMODE_WRITE) {
		stop_dac(s);
		set_dac_rate(s, val);
		if ((ret = prog_dmabuf_dac(s)))
		    return ret;
	    }
	}
	return put_user((file->f_mode & FMODE_READ) ?
			s->adcrate : s->dacrate, (int *)arg);

    case SNDCTL_DSP_STEREO:
	if (get_user(val, (int *)arg))
	    return -EFAULT;
	if (file->f_mode & FMODE_READ) {
	    stop_adc(s);
	    if (val)
		s->capcc |= CC_SM;
	    else
		s->capcc &= ~CC_SM;
	    outw(s->capcc, s->io+IT_AC_CAPCC);
	    if ((ret = prog_dmabuf_adc(s)))
		return ret;
	}
	if (file->f_mode & FMODE_WRITE) {
	    stop_dac(s);
	    if (val)
		s->pcc |= CC_SM;
	    else
		s->pcc &= ~CC_SM;
	    outw(s->pcc, s->io+IT_AC_PCC);
	    if ((ret = prog_dmabuf_dac(s)))
		return ret;
	}
	return 0;

    case SNDCTL_DSP_CHANNELS:
	if (get_user(val, (int *)arg))
	    return -EFAULT;
	if (val != 0) {
	    if (file->f_mode & FMODE_READ) {
		stop_adc(s);
		if (val >= 2) {
		    val = 2;
		    s->capcc |= CC_SM;
		}
		else
		    s->capcc &= ~CC_SM;
		outw(s->capcc, s->io+IT_AC_CAPCC);
		if ((ret = prog_dmabuf_adc(s)))
		    return ret;
	    }
	    if (file->f_mode & FMODE_WRITE) {
		stop_dac(s);
		switch (val) {
		case 1:
		    s->pcc &= ~CC_SM;
		    break;
		case 2:
		    s->pcc |= CC_SM;
		    break;
		default:
		    // FIX! support multichannel???
		    val = 2;
		    s->pcc |= CC_SM;
		    break;
		}
		outw(s->pcc, s->io+IT_AC_PCC);
		if ((ret = prog_dmabuf_dac(s)))
		    return ret;
	    }
	}
	return put_user(val, (int *)arg);
		
    case SNDCTL_DSP_GETFMTS: /* Returns a mask */
	return put_user(AFMT_S16_LE|AFMT_U8, (int *)arg);
		
    case SNDCTL_DSP_SETFMT: /* Selects ONE fmt*/
	if (get_user(val, (int *)arg))
	    return -EFAULT;
	if (val != AFMT_QUERY) {
	    if (file->f_mode & FMODE_READ) {
		stop_adc(s);
		if (val == AFMT_S16_LE)
		    s->capcc |= CC_DF;
		else {
		    val = AFMT_U8;
		    s->capcc &= ~CC_DF;
		}
		outw(s->capcc, s->io+IT_AC_CAPCC);
		if ((ret = prog_dmabuf_adc(s)))
		    return ret;
	    }
	    if (file->f_mode & FMODE_WRITE) {
		stop_dac(s);
		if (val == AFMT_S16_LE)
		    s->pcc |= CC_DF;
		else {
		    val = AFMT_U8;
		    s->pcc &= ~CC_DF;
		}
		outw(s->pcc, s->io+IT_AC_PCC);
		if ((ret = prog_dmabuf_dac(s)))
		    return ret;
	    }
	} else {
	    if (file->f_mode & FMODE_READ)
		val = (s->capcc & CC_DF) ? AFMT_S16_LE : AFMT_U8;
	    else
		val = (s->pcc & CC_DF) ? AFMT_S16_LE : AFMT_U8;
	}
	return put_user(val, (int *)arg);
		
    case SNDCTL_DSP_POST:
	return 0;

    case SNDCTL_DSP_GETTRIGGER:
	val = 0;
	spin_lock_irqsave(&s->lock, flags);
	if (file->f_mode & FMODE_READ && !s->dma_adc.stopped)
	    val |= PCM_ENABLE_INPUT;
	if (file->f_mode & FMODE_WRITE && !s->dma_dac.stopped)
	    val |= PCM_ENABLE_OUTPUT;
	spin_unlock_irqrestore(&s->lock, flags);
	return put_user(val, (int *)arg);
		
    case SNDCTL_DSP_SETTRIGGER:
	if (get_user(val, (int *)arg))
	    return -EFAULT;
	if (file->f_mode & FMODE_READ) {
	    if (val & PCM_ENABLE_INPUT)
		start_adc(s);
	    else
		stop_adc(s);
	}
	if (file->f_mode & FMODE_WRITE) {
	    if (val & PCM_ENABLE_OUTPUT)
		start_dac(s);
	    else
		stop_dac(s);
	}
	return 0;

    case SNDCTL_DSP_GETOSPACE:
	if (!(file->f_mode & FMODE_WRITE))
	    return -EINVAL;
	abinfo.fragsize = s->dma_dac.fragsize;
	spin_lock_irqsave(&s->lock, flags);
	count = s->dma_dac.count;
	if (!s->dma_dac.stopped)
	    count -= (s->dma_dac.fragsize - inw(s->io+IT_AC_PCDL));
	spin_unlock_irqrestore(&s->lock, flags);
	if (count < 0)
	    count = 0;
	abinfo.bytes = s->dma_dac.dmasize - count;
	abinfo.fragstotal = s->dma_dac.numfrag;
	abinfo.fragments = abinfo.bytes >> s->dma_dac.fragshift;      
	return copy_to_user((void *)arg, &abinfo, sizeof(abinfo)) ? -EFAULT : 0;

    case SNDCTL_DSP_GETISPACE:
	if (!(file->f_mode & FMODE_READ))
	    return -EINVAL;
	abinfo.fragsize = s->dma_adc.fragsize;
	spin_lock_irqsave(&s->lock, flags);
	count = s->dma_adc.count;
	if (!s->dma_adc.stopped)
	    count += (s->dma_adc.fragsize - inw(s->io+IT_AC_CAPCDL));
	spin_unlock_irqrestore(&s->lock, flags);
	if (count < 0)
	    count = 0;
	abinfo.bytes = count;
	abinfo.fragstotal = s->dma_adc.numfrag;
	abinfo.fragments = abinfo.bytes >> s->dma_adc.fragshift;      
	return copy_to_user((void *)arg, &abinfo, sizeof(abinfo)) ? -EFAULT : 0;
		
    case SNDCTL_DSP_NONBLOCK:
	file->f_flags |= O_NONBLOCK;
	return 0;

    case SNDCTL_DSP_GETODELAY:
	if (!(file->f_mode & FMODE_WRITE))
	    return -EINVAL;
	spin_lock_irqsave(&s->lock, flags);
	count = s->dma_dac.count;
	if (!s->dma_dac.stopped)
	    count -= (s->dma_dac.fragsize - inw(s->io+IT_AC_PCDL));
	spin_unlock_irqrestore(&s->lock, flags);
	if (count < 0)
	    count = 0;
	return put_user(count, (int *)arg);

    case SNDCTL_DSP_GETIPTR:
	if (!(file->f_mode & FMODE_READ))
	    return -EINVAL;
	spin_lock_irqsave(&s->lock, flags);
	cinfo.bytes = s->dma_adc.total_bytes;
	count = s->dma_adc.count;
	if (!s->dma_adc.stopped) {
	    diff = s->dma_adc.fragsize - inw(s->io+IT_AC_CAPCDL);
	    count += diff;
	    cinfo.bytes += diff;
	    cinfo.ptr = inl(s->io+s->dma_adc.curBufPtr) - s->dma_adc.dmaaddr;
	} else
	    cinfo.ptr = virt_to_bus(s->dma_adc.nextIn) - s->dma_adc.dmaaddr;
	if (s->dma_adc.mapped)
	    s->dma_adc.count &= s->dma_adc.fragsize-1;
	spin_unlock_irqrestore(&s->lock, flags);
	if (count < 0)
	    count = 0;
	cinfo.blocks = count >> s->dma_adc.fragshift;
	return copy_to_user((void *)arg, &cinfo, sizeof(cinfo));

    case SNDCTL_DSP_GETOPTR:
	if (!(file->f_mode & FMODE_READ))
	    return -EINVAL;
	spin_lock_irqsave(&s->lock, flags);
	cinfo.bytes = s->dma_dac.total_bytes;
	count = s->dma_dac.count;
	if (!s->dma_dac.stopped) {
	    diff = s->dma_dac.fragsize - inw(s->io+IT_AC_CAPCDL);
	    count -= diff;
	    cinfo.bytes += diff;
	    cinfo.ptr = inl(s->io+s->dma_dac.curBufPtr) - s->dma_dac.dmaaddr;
	} else
	    cinfo.ptr = virt_to_bus(s->dma_dac.nextOut) - s->dma_dac.dmaaddr;
	if (s->dma_dac.mapped)
	    s->dma_dac.count &= s->dma_dac.fragsize-1;
	spin_unlock_irqrestore(&s->lock, flags);
	if (count < 0)
	    count = 0;
	cinfo.blocks = count >> s->dma_dac.fragshift;
	return copy_to_user((void *)arg, &cinfo, sizeof(cinfo));

    case SNDCTL_DSP_GETBLKSIZE:
	if (file->f_mode & FMODE_WRITE)
	    return put_user(s->dma_dac.fragsize, (int *)arg);
	else
	    return put_user(s->dma_adc.fragsize, (int *)arg);

    case SNDCTL_DSP_SETFRAGMENT:
	if (get_user(val, (int *)arg))
	    return -EFAULT;
	if (file->f_mode & FMODE_READ) {
	    stop_adc(s);
	    s->dma_adc.ossfragshift = val & 0xffff;
	    s->dma_adc.ossmaxfrags = (val >> 16) & 0xffff;
	    if (s->dma_adc.ossfragshift < 4)
		s->dma_adc.ossfragshift = 4;
	    if (s->dma_adc.ossfragshift > 15)
		s->dma_adc.ossfragshift = 15;
	    if (s->dma_adc.ossmaxfrags < 4)
		s->dma_adc.ossmaxfrags = 4;
	    if ((ret = prog_dmabuf_adc(s)))
		return ret;
	}
	if (file->f_mode & FMODE_WRITE) {
	    stop_dac(s);
	    s->dma_dac.ossfragshift = val & 0xffff;
	    s->dma_dac.ossmaxfrags = (val >> 16) & 0xffff;
	    if (s->dma_dac.ossfragshift < 4)
		s->dma_dac.ossfragshift = 4;
	    if (s->dma_dac.ossfragshift > 15)
		s->dma_dac.ossfragshift = 15;
	    if (s->dma_dac.ossmaxfrags < 4)
		s->dma_dac.ossmaxfrags = 4;
	    if ((ret = prog_dmabuf_dac(s)))
		return ret;
	}
	return 0;

    case SNDCTL_DSP_SUBDIVIDE:
	if ((file->f_mode & FMODE_READ && s->dma_adc.subdivision) ||
	    (file->f_mode & FMODE_WRITE && s->dma_dac.subdivision))
	    return -EINVAL;
	if (get_user(val, (int *)arg))
	    return -EFAULT;
	if (val != 1 && val != 2 && val != 4)
	    return -EINVAL;
	if (file->f_mode & FMODE_READ) {
	    stop_adc(s);
	    s->dma_adc.subdivision = val;
	    if ((ret = prog_dmabuf_adc(s)))
		return ret;
	}
	if (file->f_mode & FMODE_WRITE) {
	    stop_dac(s);
	    s->dma_dac.subdivision = val;
	    if ((ret = prog_dmabuf_dac(s)))
		return ret;
	}
	return 0;

    case SOUND_PCM_READ_RATE:
	return put_user((file->f_mode & FMODE_READ) ?
			s->adcrate : s->dacrate, (int *)arg);

    case SOUND_PCM_READ_CHANNELS:
	if (file->f_mode & FMODE_READ)
	    return put_user((s->capcc & CC_SM) ? 2 : 1, (int *)arg);
	else
	    return put_user((s->pcc & CC_SM) ? 2 : 1, (int *)arg);
	    
    case SOUND_PCM_READ_BITS:
	if (file->f_mode & FMODE_READ)
	    return put_user((s->capcc & CC_DF) ? 16 : 8, (int *)arg);
	else
	    return put_user((s->pcc & CC_DF) ? 16 : 8, (int *)arg);

    case SOUND_PCM_WRITE_FILTER:
    case SNDCTL_DSP_SETSYNCRO:
    case SOUND_PCM_READ_FILTER:
	return -EINVAL;
    }

    return mixdev_ioctl(&s->codec, cmd, arg);
}


static int it8172_open(struct inode *inode, struct file *file)
{
    int minor = MINOR(inode->i_rdev);
    DECLARE_WAITQUEUE(wait, current);
    unsigned long flags;
    struct list_head *list;
    struct it8172_state *s;
    int ret;
    
    for (list = devs.next; ; list = list->next) {
	if (list == &devs)
	    return -ENODEV;
	s = list_entry(list, struct it8172_state, devs);
	if (!((s->dev_audio ^ minor) & ~0xf))
	    break;
    }
    file->private_data = s;
    /* wait for device to become free */
    down(&s->open_sem);
    while (s->open_mode & file->f_mode) {
	if (file->f_flags & O_NONBLOCK) {
	    up(&s->open_sem);
	    return -EBUSY;
	}
	add_wait_queue(&s->open_wait, &wait);
	__set_current_state(TASK_INTERRUPTIBLE);
	up(&s->open_sem);
	schedule();
	remove_wait_queue(&s->open_wait, &wait);
	set_current_state(TASK_RUNNING);
	if (signal_pending(current))
	    return -ERESTARTSYS;
	down(&s->open_sem);
    }

    spin_lock_irqsave(&s->lock, flags);

    if (file->f_mode & FMODE_READ) {
	s->dma_adc.ossfragshift = s->dma_adc.ossmaxfrags =
	    s->dma_adc.subdivision = s->dma_adc.total_bytes = 0;
	s->capcc &= ~(CC_SM | CC_DF);
	set_adc_rate(s, 8000);
	if ((minor & 0xf) == SND_DEV_DSP16)
	    s->capcc |= CC_DF;
	outw(s->capcc, s->io+IT_AC_CAPCC);
	if ((ret = prog_dmabuf_adc(s)))
	    return ret;
    }
    if (file->f_mode & FMODE_WRITE) {
	s->dma_dac.ossfragshift = s->dma_dac.ossmaxfrags =
	    s->dma_dac.subdivision = s->dma_dac.total_bytes = 0;
	s->pcc &= ~(CC_SM | CC_DF);
	set_dac_rate(s, 8000);
	if ((minor & 0xf) == SND_DEV_DSP16)
	    s->pcc |= CC_DF;
	outw(s->pcc, s->io+IT_AC_PCC);
	if ((ret = prog_dmabuf_dac(s)))
	    return ret;
    }

    spin_unlock_irqrestore(&s->lock, flags);

    s->open_mode |= file->f_mode & (FMODE_READ | FMODE_WRITE);
    up(&s->open_sem);
    return 0;
}

static int it8172_release(struct inode *inode, struct file *file)
{
    struct it8172_state *s = (struct it8172_state *)file->private_data;

    lock_kernel();
    if (file->f_mode & FMODE_WRITE)
	drain_dac(s, file->f_flags & O_NONBLOCK);
    down(&s->open_sem);
    if (file->f_mode & FMODE_WRITE) {
	stop_dac(s);
	dealloc_dmabuf(s, &s->dma_dac);
    }
    if (file->f_mode & FMODE_READ) {
	stop_adc(s);
	dealloc_dmabuf(s, &s->dma_adc);
    }
    s->open_mode &= (~file->f_mode) & (FMODE_READ|FMODE_WRITE);
    up(&s->open_sem);
    wake_up(&s->open_wait);
    unlock_kernel();
    return 0;
}

static /*const*/ struct file_operations it8172_audio_fops = {
    owner:	THIS_MODULE,
    llseek:	it8172_llseek,
    read:	it8172_read,
    write:	it8172_write,
    poll:	it8172_poll,
    ioctl:	it8172_ioctl,
    mmap:	it8172_mmap,
    open:	it8172_open,
    release:	it8172_release,
};


/* --------------------------------------------------------------------- */


/* --------------------------------------------------------------------- */

/*
 * for debugging purposes, we'll create a proc device that dumps the
 * CODEC chipstate
 */

#ifdef IT8172_DEBUG
static int proc_it8172_dump (char *buf, char **start, off_t fpos,
			     int length, int *eof, void *data)
{
    struct it8172_state *s;
    int cnt, len = 0;

    if (list_empty(&devs))
	return 0;
    s = list_entry(devs.next, struct it8172_state, devs);

    /* print out header */
    len += sprintf(buf + len, "\n\t\tIT8172 Audio Debug\n\n");

    // print out digital controller state
    len += sprintf (buf + len, "IT8172 Audio Controller registers\n");
    len += sprintf (buf + len, "---------------------------------\n");
    cnt=0;
    while (cnt < 0x72) {
	if (cnt == IT_AC_PCB1STA || cnt == IT_AC_PCB2STA ||
	    cnt == IT_AC_CAPB1STA || cnt == IT_AC_CAPB2STA ||
	    cnt == IT_AC_PFDP) {
	    len+= sprintf (buf + len, "reg %02x = %08x\n",
			   cnt, inl(s->io+cnt));
	    cnt += 4;
	} else {
	    len+= sprintf (buf + len, "reg %02x = %04x\n",
			   cnt, inw(s->io+cnt));
	    cnt += 2;
	}
    }
    
    /* print out CODEC state */
    len += sprintf (buf + len, "\nAC97 CODEC registers\n");
    len += sprintf (buf + len, "----------------------\n");
    for (cnt=0; cnt <= 0x7e; cnt = cnt +2)
	len+= sprintf (buf + len, "reg %02x = %04x\n",
		       cnt, rdcodec(&s->codec, cnt));

    if (fpos >=len){
	*start = buf;
	*eof =1;
	return 0;
    }
    *start = buf + fpos;
    if ((len -= fpos) > length)
	return length;
    *eof =1;
    return len;

}
#endif /* IT8172_DEBUG */

/* --------------------------------------------------------------------- */

/* maximum number of devices; only used for command line params */
#define NR_DEVICE 5

static int spdif[NR_DEVICE] = { 0, };

static unsigned int devindex = 0;

MODULE_PARM(spdif, "1-" __MODULE_STRING(NR_DEVICE) "i");
MODULE_PARM_DESC(spdif, "if 1 the S/PDIF digital output is enabled");

MODULE_AUTHOR("Monta Vista Software, stevel@mvista.com");
MODULE_DESCRIPTION("IT8172 AudioPCI97 Driver");

/* --------------------------------------------------------------------- */

static int __devinit it8172_probe(struct pci_dev *pcidev,
				  const struct pci_device_id *pciid)
{
    struct it8172_state *s;
    int i, val;
    unsigned short pcisr, vol;
    unsigned char legacy, imc;
    char proc_str[80];
    
    if (pcidev->irq == 0) 
	return -1;

    if (!(s = kmalloc(sizeof(struct it8172_state), GFP_KERNEL))) {
	printk(KERN_ERR PFX "alloc of device struct failed\n");
	return -1;
    }
	
    memset(s, 0, sizeof(struct it8172_state));
    init_waitqueue_head(&s->dma_adc.wait);
    init_waitqueue_head(&s->dma_dac.wait);
    init_waitqueue_head(&s->open_wait);
    init_MUTEX(&s->open_sem);
    spin_lock_init(&s->lock);
    s->dev = pcidev;
    s->io = pci_resource_start(pcidev, 0);
    s->irq = pcidev->irq;
    s->vendor = pcidev->vendor;
    s->device = pcidev->device;
    pci_read_config_byte(pcidev, PCI_REVISION_ID, &s->rev);
    s->codec.private_data = s;
    s->codec.id = 0;
    s->codec.codec_read = rdcodec;
    s->codec.codec_write = wrcodec;
    s->codec.codec_wait = waitcodec;

    if (!request_region(s->io, pci_resource_len(pcidev,0),
			IT8172_MODULE_NAME)) {
	printk(KERN_ERR PFX "io ports %#lx->%#lx in use\n",
		s->io, s->io + pci_resource_len(pcidev,0)-1);
	goto err_region;
    }
    if (request_irq(s->irq, it8172_interrupt, SA_INTERRUPT,
		    IT8172_MODULE_NAME, s)) {
	printk(KERN_ERR PFX "irq %u in use\n", s->irq);
	goto err_irq;
    }

    printk(KERN_INFO PFX "IO at %#lx, IRQ %d\n", s->io, s->irq);

    /* register devices */
    if ((s->dev_audio = register_sound_dsp(&it8172_audio_fops, -1)) < 0)
	goto err_dev1;
    if ((s->codec.dev_mixer =
	 register_sound_mixer(&it8172_mixer_fops, -1)) < 0)
	goto err_dev2;

#ifdef IT8172_DEBUG
    /* intialize the debug proc device */
    s->ps = create_proc_read_entry(IT8172_MODULE_NAME, 0, NULL,
				   proc_it8172_dump, NULL);
#endif /* IT8172_DEBUG */
	
    /*
     * Reset the Audio device using the IT8172 PCI Reset register. This
     * creates an audible double click on a speaker connected to Line-out.
     */
    IT_IO_READ16(IT_PM_PCISR, pcisr);
    pcisr |= IT_PM_PCISR_ACSR;
    IT_IO_WRITE16(IT_PM_PCISR, pcisr);
    /* wait up to 100msec for reset to complete */
    for (i=0; pcisr & IT_PM_PCISR_ACSR; i++) {
	it8172_delay(10);
	if (i == 10)
	    break;
	IT_IO_READ16(IT_PM_PCISR, pcisr);
    }
    if (i == 10) {
	printk(KERN_ERR PFX "chip reset timeout!\n");
	goto err_dev3;
    }
    
    /* enable pci io and bus mastering */
    if (pci_enable_device(pcidev))
	goto err_dev3;
    pci_set_master(pcidev);

    /* get out of legacy mode */
    pci_read_config_byte (pcidev, 0x40, &legacy);
    pci_write_config_byte (pcidev, 0x40, legacy & ~1);
    
    s->spdif_volume = -1;
    /* check to see if s/pdif mode is being requested */
    if (spdif[devindex]) {
	printk(KERN_INFO PFX "enabling S/PDIF output\n");
	s->spdif_volume = 0;
	outb(GC_SOE, s->io+IT_AC_GC);
    } else {
	printk(KERN_INFO PFX "disabling S/PDIF output\n");
	outb(0, s->io+IT_AC_GC);
    }
    
    /* cold reset the AC97 */
    outw(CODECC_CR, s->io+IT_AC_CODECC);
    udelay(1000);
    outw(0, s->io+IT_AC_CODECC);
    /* need to delay around 500msec(bleech) to give
       some CODECs enough time to wakeup */
    it8172_delay(500);
    
    /* AC97 warm reset to start the bitclk */
    outw(CODECC_WR, s->io+IT_AC_CODECC);
    udelay(1000);
    outw(0, s->io+IT_AC_CODECC);
    
    /* codec init */
    if (!ac97_probe_codec(&s->codec))
	goto err_dev3;

    /* Enable Volume button interrupts */
    imc = inb(s->io+IT_AC_IMC);
    outb(imc & ~IMC_VCIM, s->io+IT_AC_IMC);

    /* Un-mute PCM and FM out on the controller */
    vol = inw(s->io+IT_AC_PCMOV);
    outw(vol & ~PCMOV_PCMOM, s->io+IT_AC_PCMOV);
    vol = inw(s->io+IT_AC_FMOV);
    outw(vol & ~FMOV_FMOM, s->io+IT_AC_FMOV);

    /* set channel defaults to 8-bit, mono, 8 Khz */
    s->pcc = 0;
    s->capcc = 0;
    set_dac_rate(s, 8000);
    set_adc_rate(s, 8000);

    /* set mic to be the recording source */
    val = SOUND_MASK_MIC;
    mixdev_ioctl(&s->codec, SOUND_MIXER_WRITE_RECSRC, (unsigned long)&val);

    /* mute master and PCM when in S/PDIF mode */
    if (s->spdif_volume != -1) {
	val = 0x0000;
	mixdev_ioctl(&s->codec, SOUND_MIXER_WRITE_VOLUME,
		     (unsigned long)&val);
	mixdev_ioctl(&s->codec, SOUND_MIXER_WRITE_PCM,
		     (unsigned long)&val);
    }
    
#ifdef IT8172_DEBUG
    sprintf(proc_str, "driver/%s/%d/ac97", IT8172_MODULE_NAME, s->codec.id);
    s->ac97_ps = create_proc_read_entry (proc_str, 0, NULL,
					 ac97_read_proc, &s->codec);
#endif
    
    /* store it in the driver field */
    pci_set_drvdata(pcidev, s);
    pcidev->dma_mask = 0xffffffff;
    /* put it into driver list */
    list_add_tail(&s->devs, &devs);
    /* increment devindex */
    if (devindex < NR_DEVICE-1)
	devindex++;
    return 0;

 err_dev3:
    unregister_sound_mixer(s->codec.dev_mixer);
 err_dev2:
    unregister_sound_dsp(s->dev_audio);
 err_dev1:
    printk(KERN_ERR PFX "cannot register misc device\n");
    free_irq(s->irq, s);
 err_irq:
    release_region(s->io, pci_resource_len(pcidev,0));
 err_region:
    kfree(s);
    return -1;
}

static void __devinit it8172_remove(struct pci_dev *dev)
{
    struct it8172_state *s = pci_get_drvdata(dev);

    if (!s)
	return;
    list_del(&s->devs);
#ifdef IT8172_DEBUG
    if (s->ps)
	remove_proc_entry(IT8172_MODULE_NAME, NULL);
#endif /* IT8172_DEBUG */
    synchronize_irq();
    free_irq(s->irq, s);
    release_region(s->io, pci_resource_len(dev,0));
    unregister_sound_dsp(s->dev_audio);
    unregister_sound_mixer(s->codec.dev_mixer);
    kfree(s);
    pci_set_drvdata(dev, NULL);
}



static struct pci_device_id id_table[] __devinitdata = {
    { PCI_VENDOR_ID_ITE, PCI_DEVICE_ID_ITE_IT8172G_AUDIO, PCI_ANY_ID,
      PCI_ANY_ID, 0, 0 },
    { 0, }
};

MODULE_DEVICE_TABLE(pci, id_table);

static struct pci_driver it8172_driver = {
    name: IT8172_MODULE_NAME,
    id_table: id_table,
    probe: it8172_probe,
    remove: it8172_remove
};

static int __init init_it8172(void)
{
    if (!pci_present())   /* No PCI bus in this machine! */
	return -ENODEV;
    printk("version v0.26 time " __TIME__ " " __DATE__ "\n");
    return pci_module_init(&it8172_driver);
}

static void __exit cleanup_it8172(void)
{
    printk(KERN_INFO PFX "unloading\n");
    pci_unregister_driver(&it8172_driver);
}

module_init(init_it8172);
module_exit(cleanup_it8172);