Logo Search packages:      
Sourcecode: linux-2.6 version File versions  Download package

ite8172.c

/*
 *      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.
 *      * I2S support.
 *  3. The following is not supported:
 *      * legacy audio mode.
 *  4. Support for volume button interrupts is implemented but doesn't
 *     work yet.
 *
 *  Revision history
 *    02.08.2001  Initial release
 *    06.22.2001  Added I2S support
 *    07.30.2003  Removed initialisation to zero for static variables
 *             (spdif[NR_DEVICE], i2s_fmt[NR_DEVICE], and devindex)
 */
#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/slab.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/interrupt.h>
#include <linux/mutex.h>

#include <asm/io.h>
#include <asm/dma.h>
#include <asm/uaccess.h>
#include <asm/it8172/it8172.h>

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

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

#define IT8172_MODULE_NAME "IT8172 audio"
#define PFX IT8172_MODULE_NAME

#ifdef IT8172_DEBUG
#define dbg(format, arg...) printk(KERN_DEBUG PFX ": " format "\n" , ## arg)
#else
#define dbg(format, arg...) do {} while (0)
#endif
#define err(format, arg...) printk(KERN_ERR PFX ": " format "\n" , ## arg)
#define info(format, arg...) printk(KERN_INFO PFX ": " format "\n" , ## arg)
#define warn(format, arg...) printk(KERN_WARNING PFX ": " format "\n" , ## arg)


#define IT8172_MODULE_NAME "IT8172 audio"
#define PFX IT8172_MODULE_NAME

#ifdef IT8172_DEBUG
#define dbg(format, arg...) printk(KERN_DEBUG PFX ": " format "\n" , ## arg)
#else
#define dbg(format, arg...) do {} while (0)
#endif
#define err(format, arg...) printk(KERN_ERR PFX ": " format "\n" , ## arg)
#define info(format, arg...) printk(KERN_INFO PFX ": " format "\n" , ## arg)
#define warn(format, arg...) printk(KERN_WARNING PFX ": " format "\n" , ## arg)


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 DIGITAL1 as the I2S channel, since it is not listed in
 * soundcard.h.
 */
#define SOUND_MIXER_I2S        SOUND_MIXER_DIGITAL1
#define SOUND_MASK_I2S         SOUND_MASK_DIGITAL1
#define SOUND_MIXER_READ_I2S   MIXER_READ(SOUND_MIXER_I2S)
#define SOUND_MIXER_WRITE_I2S  MIXER_WRITE(SOUND_MIXER_I2S)

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

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 */
      int i2s_volume;   /* current I2S out volume, in OSS format */
      int i2s_recording;/* 1 = recording from I2S, 0 = not */
    
#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 mutex open_mutex;
      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);

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

static 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)
            err("rdcodec: codec ready poll expired!");

      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)
            err("rdcodec: read poll expired!");

      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)
            err("wrcodec: codec ready poll expired!");

      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) {
            err("codec reg 26 status (0x%x) not ready!!", temp);
            return;
      }
}


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

static 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);
}     

static 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

static 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++)
                  ClearPageReserved(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_pfn_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++)
                  SetPageReserved(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, bufs);
    
#ifdef IT8172_VERBOSE_DEBUG
      dbg("rate=%d, fragsize=%d, numfrag=%d, dmasize=%d",
          rate, db->fragsize, db->numfrag, db->dmasize);
#endif

      // set data length register
      outw(db->fragsize, s->io+reg+2);
      db->ready = 1;

      return 0;
}

static 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);
}

static 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 irqreturn_t 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))) {
            spin_unlock(&s->lock);
            return IRQ_NONE;
      }
    
      /* clear audio interrupts first */
      outb(isc | ISC_VCI | ISC_CCI | ISC_PCI, s->io+IT_AC_ISC);
    
      /* handle volume button events (ignore if S/PDIF enabled) */
      if ((isc & ISC_VCI) && s->spdif_volume == -1) {
            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++;
                  dbg("adc overrun");
            } 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);
      return IRQ_HANDLED;
}

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

static int it8172_open_mixdev(struct inode *inode, struct file *file)
{
      int minor = iminor(inode);
      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 nonseekable_open(inode, file);
}

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


static u16
cvt_ossvol(unsigned int gain)
{
      u16 ret;
    
      if (gain == 0)
            return 0;
    
      if (gain > 100)
            gain = 100;
    
      ret = (100 - gain + 32) / 4;
      ret = ret > 31 ? 31 : ret;
      return ret;
}


static int mixdev_ioctl(struct ac97_codec *codec, unsigned int cmd,
                  unsigned long arg)
{
      struct it8172_state *s = (struct it8172_state *)codec->private_data;
      unsigned int left, right;
      unsigned long flags;
      int val;
      u16 vol;
    
      /*
       * When we are in S/PDIF mode, we want to disable any analog output so
       * we filter the master/PCM channel volume ioctls.
       *
       * Also filter I2S channel, which AC'97 knows nothing about.
       */

      switch (cmd) {
      case SOUND_MIXER_WRITE_VOLUME:
            // if not in S/PDIF mode, pass to AC'97
            if (s->spdif_volume == -1)
                  break;
            return 0;
      case SOUND_MIXER_WRITE_PCM:
            // if not in S/PDIF mode, pass to AC'97
            if (s->spdif_volume == -1)
                  break;
            if (get_user(val, (int *)arg))
                  return -EFAULT;
            right = ((val >> 8)  & 0xff);
            left = (val  & 0xff);
            if (right > 100)
                  right = 100;
            if (left > 100)
                  left = 100;
            s->spdif_volume = (right << 8) | left;
            vol = cvt_ossvol(left);
            vol |= (cvt_ossvol(right) << PCMOV_PCMRCG_BIT);
            if (vol == 0)
                  vol = PCMOV_PCMOM; // mute
            spin_lock_irqsave(&s->lock, flags);
            outw(vol, s->io+IT_AC_PCMOV);
            spin_unlock_irqrestore(&s->lock, flags);
            return put_user(s->spdif_volume, (int *)arg);
      case SOUND_MIXER_READ_PCM:
            // if not in S/PDIF mode, pass to AC'97
            if (s->spdif_volume == -1)
                  break;
            return put_user(s->spdif_volume, (int *)arg);
      case SOUND_MIXER_WRITE_I2S:
            if (get_user(val, (int *)arg))
                  return -EFAULT;
            right = ((val >> 8)  & 0xff);
            left = (val  & 0xff);
            if (right > 100)
                  right = 100;
            if (left > 100)
                  left = 100;
            s->i2s_volume = (right << 8) | left;
            vol = cvt_ossvol(left);
            vol |= (cvt_ossvol(right) << I2SV_I2SRCG_BIT);
            if (vol == 0)
                  vol = I2SV_I2SOM; // mute
            outw(vol, s->io+IT_AC_I2SV);
            return put_user(s->i2s_volume, (int *)arg);
      case SOUND_MIXER_READ_I2S:
            return put_user(s->i2s_volume, (int *)arg);
      case SOUND_MIXER_WRITE_RECSRC:
            if (get_user(val, (int *)arg))
                  return -EFAULT;
            if (val & SOUND_MASK_I2S) {
                  s->i2s_recording = 1;
                  outb(DRSS_I2S, s->io+IT_AC_DRSS);
                  return 0;
            } else {
                  s->i2s_recording = 0;
                  outb(DRSS_AC97_PRIM, s->io+IT_AC_DRSS);
                  // now let AC'97 select record source
                  break;
            }
      case SOUND_MIXER_READ_RECSRC:
            if (s->i2s_recording)
                  return put_user(SOUND_MASK_I2S, (int *)arg);
            else
                  // let AC'97 report recording source
                  break;
      }

      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           = no_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 || s->dma_dac.stopped)
            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;
}

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


/*
 * Copy audio data to/from user buffer from/to dma buffer, taking care
 * that we wrap when reading/writing the dma buffer. Returns actual byte
 * count written to or read from the dma buffer.
 */
static int copy_dmabuf_user(struct dmabuf *db, char* userbuf,
                      int count, int to_user)
{
      char* bufptr = to_user ? db->nextOut : db->nextIn;
      char* bufend = db->rawbuf + db->dmasize;
      
      if (bufptr + count > bufend) {
            int partial = (int)(bufend - bufptr);
            if (to_user) {
                  if (copy_to_user(userbuf, bufptr, partial))
                        return -EFAULT;
                  if (copy_to_user(userbuf + partial, db->rawbuf,
                               count - partial))
                        return -EFAULT;
            } else {
                  if (copy_from_user(bufptr, userbuf, partial))
                        return -EFAULT;
                  if (copy_from_user(db->rawbuf,
                                 userbuf + partial,
                                 count - partial))
                        return -EFAULT;
            }
      } else {
            if (to_user) {
                  if (copy_to_user(userbuf, bufptr, count))
                        return -EFAULT;
            } else {
                  if (copy_from_user(bufptr, userbuf, count))
                        return -EFAULT;
            }
      }
      
      return count;
}


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, remainder, avail;

      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);

            // copy from nextOut to user
            if ((cnt = copy_dmabuf_user(db, buffer, count > avail ?
                                  avail : count, 1)) < 0) {
                  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 -= cnt;
            buffer += cnt;
            ret += cnt;
      } // while (count > 0)

      /*
       * See if the dma buffer count after this read call is
       * aligned on a fragsize boundary. If not, read from
       * buffer until we reach a boundary, and let's hope this
       * is just the last remainder of an audio record. If not
       * it means the user is not reading in fragsize chunks, in
       * which case it's his/her fault that there are audio gaps
       * in their record.
       */
      spin_lock_irqsave(&s->lock, flags);
      remainder = db->count % db->fragsize;
      if (remainder) {
            db->nextOut += remainder;
            if (db->nextOut >= db->rawbuf + db->dmasize)
                  db->nextOut -= db->dmasize;
            db->count -= remainder;
      }
      spin_unlock_irqrestore(&s->lock, flags);

      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, remainder, avail;

      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);
      
            // copy to nextIn
            if ((cnt = copy_dmabuf_user(db, (char*)buffer,
                                  count > avail ?
                                  avail : count, 0)) < 0) {
                  if (!ret)
                        ret = -EFAULT;
                  return ret;
            }

            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 -= cnt;
            buffer += cnt;
            ret += cnt;
      } // while (count > 0)
      
      /*
       * See if the dma buffer count after this write call is
       * aligned on a fragsize boundary. If not, fill buffer
       * with silence to the next boundary, and let's hope this
       * is just the last remainder of an audio playback. If not
       * it means the user is not sending us fragsize chunks, in
       * which case it's his/her fault that there are audio gaps
       * in their playback.
       */
      spin_lock_irqsave(&s->lock, flags);
      remainder = db->count % db->fragsize;
      if (remainder) {
            int fill_cnt = db->fragsize - remainder;
            memset(db->nextIn, 0, fill_cnt);
            db->nextIn += fill_cnt;
            if (db->nextIn >= db->rawbuf + db->dmasize)
                  db->nextIn -= db->dmasize;
            db->count += fill_cnt;
      }
      spin_unlock_irqrestore(&s->lock, flags);

      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) {
            if (!s->dma_dac.ready)
                  return 0;
            poll_wait(file, &s->dma_dac.wait, wait);
      }
      if (file->f_mode & FMODE_READ) {
            if (!s->dma_adc.ready)
                  return 0;
            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_pfn_range(vma, vma->vm_start,
                       virt_to_phys(db->rawbuf) >> PAGE_SHIFT,
                       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]))
            dbg("ioctl %s, arg=0x%08x",
                ioctl_str[count].str, (unsigned int)arg);
      else
            dbg("ioctl unknown, 0x%x", 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->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->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;
            if (copy_to_user((void *)arg, &cinfo, sizeof(cinfo)))
                  return -EFAULT;
            return 0;

      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;
            if (copy_to_user((void *)arg, &cinfo, sizeof(cinfo)))
                  return -EFAULT;
            return 0;

      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 = iminor(inode);
      DECLARE_WAITQUEUE(wait, current);
      unsigned long flags;
      struct list_head *list;
      struct it8172_state *s;
      int ret;
    
#ifdef IT8172_VERBOSE_DEBUG
      if (file->f_flags & O_NONBLOCK)
            dbg("%s: non-blocking", __FUNCTION__);
      else
            dbg("%s: blocking", __FUNCTION__);
#endif
      
      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 */
      mutex_lock(&s->open_mutex);
      while (s->open_mode & file->f_mode) {
            if (file->f_flags & O_NONBLOCK) {
                  mutex_unlock(&s->open_mutex);
                  return -EBUSY;
            }
            add_wait_queue(&s->open_wait, &wait);
            __set_current_state(TASK_INTERRUPTIBLE);
            mutex_unlock(&s->open_mutex);
            schedule();
            remove_wait_queue(&s->open_wait, &wait);
            set_current_state(TASK_RUNNING);
            if (signal_pending(current))
                  return -ERESTARTSYS;
            mutex_lock(&s->open_mutex);
      }

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

      s->open_mode |= (file->f_mode & (FMODE_READ | FMODE_WRITE));
      mutex_unlock(&s->open_mutex);
      return nonseekable_open(inode, file);
}

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

#ifdef IT8172_VERBOSE_DEBUG
      dbg("%s", __FUNCTION__);
#endif
      lock_kernel();
      if (file->f_mode & FMODE_WRITE)
            drain_dac(s, file->f_flags & O_NONBLOCK);
      mutex_lock(&s->open_mutex);
      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));
      mutex_unlock(&s->open_mutex);
      wake_up(&s->open_wait);
      unlock_kernel();
      return 0;
}

static /*const*/ struct file_operations it8172_audio_fops = {
      .owner            = THIS_MODULE,
      .llseek           = no_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];
static int i2s_fmt[NR_DEVICE];

static unsigned int devindex;

module_param_array(spdif, int, NULL, 0);
MODULE_PARM_DESC(spdif, "if 1 the S/PDIF digital output is enabled");
module_param_array(i2s_fmt, int, NULL, 0);
MODULE_PARM_DESC(i2s_fmt, "the format of I2S");

MODULE_AUTHOR("Monta Vista Software, stevel@mvista.com");
MODULE_DESCRIPTION("IT8172 Audio 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))) {
            err("alloc of device struct failed");
            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);
      mutex_init(&s->open_mutex);
      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)) {
            err("io ports %#lx->%#lx in use",
                s->io, s->io + pci_resource_len(pcidev,0)-1);
            goto err_region;
      }
      if (request_irq(s->irq, it8172_interrupt, IRQF_DISABLED,
                  IT8172_MODULE_NAME, s)) {
            err("irq %u in use", s->irq);
            goto err_irq;
      }

      info("IO at %#lx, IRQ %d", 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
      /* initialize 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) {
            err("chip reset timeout!");
            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]) {
            info("enabling S/PDIF output");
            s->spdif_volume = 0;
            outb(GC_SOE, s->io+IT_AC_GC);
      } else {
            info("disabling S/PDIF output");
            outb(0, s->io+IT_AC_GC);
      }
    
      /* check to see if I2S format requested */
      if (i2s_fmt[devindex]) {
            info("setting I2S format to 0x%02x", i2s_fmt[devindex]);
            outb(i2s_fmt[devindex], s->io+IT_AC_I2SMC);
      } else {
            outb(I2SMC_I2SF_I2S, s->io+IT_AC_I2SMC);
      }

      /* 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;

      /* add I2S as allowable recording source */
      s->codec.record_sources |= SOUND_MASK_I2S;
      
      /* 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 AC'97 master and PCM when in S/PDIF mode */
      if (s->spdif_volume != -1) {
            val = 0x0000;
            s->codec.mixer_ioctl(&s->codec, SOUND_MIXER_WRITE_VOLUME,
                             (unsigned long)&val);
            s->codec.mixer_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:
      err("cannot register misc device");
      free_irq(s->irq, s);
 err_irq:
      release_region(s->io, pci_resource_len(pcidev,0));
 err_region:
      kfree(s);
      return -1;
}

static void __devexit 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(s->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[] = {
      { 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 = __devexit_p(it8172_remove)
};

static int __init init_it8172(void)
{
      info("version v0.5 time " __TIME__ " " __DATE__);
      return pci_register_driver(&it8172_driver);
}

static void __exit cleanup_it8172(void)
{
      info("unloading");
      pci_unregister_driver(&it8172_driver);
}

module_init(init_it8172);
module_exit(cleanup_it8172);

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

#ifndef MODULE

/* format is: it8172=[spdif],[i2s:<I2S format>] */

static int __init it8172_setup(char *options)
{
      char* this_opt;
      static unsigned __initdata nr_dev = 0;

      if (nr_dev >= NR_DEVICE)
            return 0;

      if (!options || !*options)
            return 0;

      while (this_opt = strsep(&options, ",")) {
            if (!*this_opt)
                  continue;
            if (!strncmp(this_opt, "spdif", 5)) {
                  spdif[nr_dev] = 1;
            } else if (!strncmp(this_opt, "i2s:", 4)) {
                  if (!strncmp(this_opt+4, "dac", 3))
                        i2s_fmt[nr_dev] = I2SMC_I2SF_DAC;
                  else if (!strncmp(this_opt+4, "adc", 3))
                        i2s_fmt[nr_dev] = I2SMC_I2SF_ADC;
                  else if (!strncmp(this_opt+4, "i2s", 3))
                        i2s_fmt[nr_dev] = I2SMC_I2SF_I2S;
            }
      }

      nr_dev++;
      return 1;
}

__setup("it8172=", it8172_setup);

#endif /* MODULE */

Generated by  Doxygen 1.6.0   Back to index