Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 2259 insertions, 0 deletions

diff --git a/sound/oss/ite8172.c b/sound/oss/ite8172.c
new file mode 100644
index 000000000000..58f879fda975
--- /dev/null
+++ b/sound/oss/ite8172.c
@@ -0,0 +1,2259 @@
+/*
+ *      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 <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 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);
+
+/* --------------------------------------------------------------------- */
+
+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 */
+	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))) {
+			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));
+	up(&s->open_sem);
+	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(__FUNCTION__);
+#endif
+	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		= 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_PARM(spdif, "1-" __MODULE_STRING(NR_DEVICE) "i");
+MODULE_PARM_DESC(spdif, "if 1 the S/PDIF digital output is enabled");
+MODULE_PARM(i2s_fmt, "1-" __MODULE_STRING(NR_DEVICE) "i");
+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);
+	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)) {
+		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, SA_INTERRUPT,
+			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_module_init(&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 */