Linux-2.6.12-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, 2119 insertions, 0 deletions

diff --git a/sound/oss/au1550_ac97.c b/sound/oss/au1550_ac97.c
new file mode 100644
index 000000000000..a78e48d412d2
--- /dev/null
+++ b/sound/oss/au1550_ac97.c
@@ -0,0 +1,2119 @@
+/*
+ * au1550_ac97.c  --  Sound driver for Alchemy Au1550 MIPS Internet Edge
+ *                    Processor.
+ *
+ * Copyright 2004 Embedded Edge, LLC
+ *	dan@embeddededge.com
+ *
+ * Mostly copied from the au1000.c driver and some from the
+ * PowerMac dbdma driver.
+ * We assume the processor can do memory coherent DMA.
+ *
+ * Ported to 2.6 by Matt Porter <mporter@kernel.crashing.org>
+ *
+ *  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.
+ *
+ */
+
+#undef DEBUG
+
+#include <linux/version.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/ioport.h>
+#include <linux/sched.h>
+#include <linux/delay.h>
+#include <linux/sound.h>
+#include <linux/slab.h>
+#include <linux/soundcard.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/poll.h>
+#include <linux/pci.h>
+#include <linux/bitops.h>
+#include <linux/spinlock.h>
+#include <linux/smp_lock.h>
+#include <linux/ac97_codec.h>
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/hardirq.h>
+#include <asm/mach-au1x00/au1000.h>
+#include <asm/mach-au1x00/au1xxx_psc.h>
+#include <asm/mach-au1x00/au1xxx_dbdma.h>
+
+#undef OSS_DOCUMENTED_MIXER_SEMANTICS
+
+/* misc stuff */
+#define POLL_COUNT   0x50000
+#define AC97_EXT_DACS (AC97_EXTID_SDAC | AC97_EXTID_CDAC | AC97_EXTID_LDAC)
+
+/* The number of DBDMA ring descriptors to allocate.  No sense making
+ * this too large....if you can't keep up with a few you aren't likely
+ * to be able to with lots of them, either.
+ */
+#define NUM_DBDMA_DESCRIPTORS 4
+
+#define err(format, arg...) printk(KERN_ERR format "\n" , ## arg)
+
+/* Boot options
+ * 0 = no VRA, 1 = use VRA if codec supports it
+ */
+static int      vra = 1;
+MODULE_PARM(vra, "i");
+MODULE_PARM_DESC(vra, "if 1 use VRA if codec supports it");
+
+static struct au1550_state {
+	/* soundcore stuff */
+	int             dev_audio;
+
+	struct ac97_codec *codec;
+	unsigned        codec_base_caps; /* AC'97 reg 00h, "Reset Register" */
+	unsigned        codec_ext_caps;  /* AC'97 reg 28h, "Extended Audio ID" */
+	int             no_vra;		/* do not use VRA */
+
+	spinlock_t      lock;
+	struct semaphore open_sem;
+	struct semaphore sem;
+	mode_t          open_mode;
+	wait_queue_head_t open_wait;
+
+	struct dmabuf {
+		u32		dmanr;
+		unsigned        sample_rate;
+		unsigned	src_factor;
+		unsigned        sample_size;
+		int             num_channels;
+		int		dma_bytes_per_sample;
+		int		user_bytes_per_sample;
+		int		cnt_factor;
+
+		void		*rawbuf;
+		unsigned        buforder;
+		unsigned	numfrag;
+		unsigned        fragshift;
+		void		*nextIn;
+		void		*nextOut;
+		int		count;
+		unsigned        total_bytes;
+		unsigned        error;
+		wait_queue_head_t wait;
+
+		/* redundant, but makes calculations easier */
+		unsigned	fragsize;
+		unsigned	dma_fragsize;
+		unsigned	dmasize;
+		unsigned	dma_qcount;
+
+		/* OSS stuff */
+		unsigned        mapped:1;
+		unsigned        ready:1;
+		unsigned        stopped:1;
+		unsigned        ossfragshift;
+		int             ossmaxfrags;
+		unsigned        subdivision;
+	} dma_dac, dma_adc;
+} au1550_state;
+
+static 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
+au1550_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 u16
+rdcodec(struct ac97_codec *codec, u8 addr)
+{
+	struct au1550_state *s = (struct au1550_state *)codec->private_data;
+	unsigned long   flags;
+	u32             cmd, val;
+	u16             data;
+	int             i;
+
+	spin_lock_irqsave(&s->lock, flags);
+
+	for (i = 0; i < POLL_COUNT; i++) {
+		val = au_readl(PSC_AC97STAT);
+		au_sync();
+		if (!(val & PSC_AC97STAT_CP))
+			break;
+	}
+	if (i == POLL_COUNT)
+		err("rdcodec: codec cmd pending expired!");
+
+	cmd = (u32)PSC_AC97CDC_INDX(addr);
+	cmd |= PSC_AC97CDC_RD;	/* read command */
+	au_writel(cmd, PSC_AC97CDC);
+	au_sync();
+
+	/* now wait for the data
+	*/
+	for (i = 0; i < POLL_COUNT; i++) {
+		val = au_readl(PSC_AC97STAT);
+		au_sync();
+		if (!(val & PSC_AC97STAT_CP))
+			break;
+	}
+	if (i == POLL_COUNT) {
+		err("rdcodec: read poll expired!");
+		return 0;
+	}
+
+	/* wait for command done?
+	*/
+	for (i = 0; i < POLL_COUNT; i++) {
+		val = au_readl(PSC_AC97EVNT);
+		au_sync();
+		if (val & PSC_AC97EVNT_CD)
+			break;
+	}
+	if (i == POLL_COUNT) {
+		err("rdcodec: read cmdwait expired!");
+		return 0;
+	}
+
+	data = au_readl(PSC_AC97CDC) & 0xffff;
+	au_sync();
+
+	/* Clear command done event.
+	*/
+	au_writel(PSC_AC97EVNT_CD, PSC_AC97EVNT);
+	au_sync();
+
+	spin_unlock_irqrestore(&s->lock, flags);
+
+	return data;
+}
+
+
+static void
+wrcodec(struct ac97_codec *codec, u8 addr, u16 data)
+{
+	struct au1550_state *s = (struct au1550_state *)codec->private_data;
+	unsigned long   flags;
+	u32             cmd, val;
+	int             i;
+
+	spin_lock_irqsave(&s->lock, flags);
+
+	for (i = 0; i < POLL_COUNT; i++) {
+		val = au_readl(PSC_AC97STAT);
+		au_sync();
+		if (!(val & PSC_AC97STAT_CP))
+			break;
+	}
+	if (i == POLL_COUNT)
+		err("wrcodec: codec cmd pending expired!");
+
+	cmd = (u32)PSC_AC97CDC_INDX(addr);
+	cmd |= (u32)data;
+	au_writel(cmd, PSC_AC97CDC);
+	au_sync();
+
+	for (i = 0; i < POLL_COUNT; i++) {
+		val = au_readl(PSC_AC97STAT);
+		au_sync();
+		if (!(val & PSC_AC97STAT_CP))
+			break;
+	}
+	if (i == POLL_COUNT)
+		err("wrcodec: codec cmd pending expired!");
+
+	for (i = 0; i < POLL_COUNT; i++) {
+		val = au_readl(PSC_AC97EVNT);
+		au_sync();
+		if (val & PSC_AC97EVNT_CD)
+			break;
+	}
+	if (i == POLL_COUNT)
+		err("wrcodec: read cmdwait expired!");
+
+	/* Clear command done event.
+	*/
+	au_writel(PSC_AC97EVNT_CD, PSC_AC97EVNT);
+	au_sync();
+
+	spin_unlock_irqrestore(&s->lock, flags);
+}
+
+static void
+waitcodec(struct ac97_codec *codec)
+{
+	u16	temp;
+	u32	val;
+	int	i;
+
+	/* codec_wait is used to wait for a ready state after
+	 * an AC97C_RESET.
+	 */
+	au1550_delay(10);
+
+	/* first poll the CODEC_READY tag bit
+	*/
+	for (i = 0; i < POLL_COUNT; i++) {
+		val = au_readl(PSC_AC97STAT);
+		au_sync();
+		if (val & PSC_AC97STAT_CR)
+			break;
+	}
+	if (i == POLL_COUNT) {
+		err("waitcodec: CODEC_READY poll expired!");
+		return;
+	}
+
+	/* get AC'97 powerdown control/status register
+	*/
+	temp = rdcodec(codec, AC97_POWER_CONTROL);
+
+	/* If anything is powered down, power'em up
+	*/
+	if (temp & 0x7f00) {
+		/* Power on
+		*/
+		wrcodec(codec, AC97_POWER_CONTROL, 0);
+		au1550_delay(100);
+
+		/* Reread
+		*/
+		temp = rdcodec(codec, AC97_POWER_CONTROL);
+	}
+
+	/* Check if Codec REF,ANL,DAC,ADC ready
+	*/
+	if ((temp & 0x7f0f) != 0x000f)
+		err("codec reg 26 status (0x%x) not ready!!", temp);
+}
+
+/* stop the ADC before calling */
+static void
+set_adc_rate(struct au1550_state *s, unsigned rate)
+{
+	struct dmabuf  *adc = &s->dma_adc;
+	struct dmabuf  *dac = &s->dma_dac;
+	unsigned        adc_rate, dac_rate;
+	u16             ac97_extstat;
+
+	if (s->no_vra) {
+		/* calc SRC factor
+		*/
+		adc->src_factor = ((96000 / rate) + 1) >> 1;
+		adc->sample_rate = 48000 / adc->src_factor;
+		return;
+	}
+
+	adc->src_factor = 1;
+
+	ac97_extstat = rdcodec(s->codec, AC97_EXTENDED_STATUS);
+
+	rate = rate > 48000 ? 48000 : rate;
+
+	/* enable VRA
+	*/
+	wrcodec(s->codec, AC97_EXTENDED_STATUS,
+		ac97_extstat | AC97_EXTSTAT_VRA);
+
+	/* now write the sample rate
+	*/
+	wrcodec(s->codec, AC97_PCM_LR_ADC_RATE, (u16) rate);
+
+	/* read it back for actual supported rate
+	*/
+	adc_rate = rdcodec(s->codec, AC97_PCM_LR_ADC_RATE);
+
+	pr_debug("set_adc_rate: set to %d Hz\n", adc_rate);
+
+	/* some codec's don't allow unequal DAC and ADC rates, in which case
+	 * writing one rate reg actually changes both.
+	 */
+	dac_rate = rdcodec(s->codec, AC97_PCM_FRONT_DAC_RATE);
+	if (dac->num_channels > 2)
+		wrcodec(s->codec, AC97_PCM_SURR_DAC_RATE, dac_rate);
+	if (dac->num_channels > 4)
+		wrcodec(s->codec, AC97_PCM_LFE_DAC_RATE, dac_rate);
+
+	adc->sample_rate = adc_rate;
+	dac->sample_rate = dac_rate;
+}
+
+/* stop the DAC before calling */
+static void
+set_dac_rate(struct au1550_state *s, unsigned rate)
+{
+	struct dmabuf  *dac = &s->dma_dac;
+	struct dmabuf  *adc = &s->dma_adc;
+	unsigned        adc_rate, dac_rate;
+	u16             ac97_extstat;
+
+	if (s->no_vra) {
+		/* calc SRC factor
+		*/
+		dac->src_factor = ((96000 / rate) + 1) >> 1;
+		dac->sample_rate = 48000 / dac->src_factor;
+		return;
+	}
+
+	dac->src_factor = 1;
+
+	ac97_extstat = rdcodec(s->codec, AC97_EXTENDED_STATUS);
+
+	rate = rate > 48000 ? 48000 : rate;
+
+	/* enable VRA
+	*/
+	wrcodec(s->codec, AC97_EXTENDED_STATUS,
+		ac97_extstat | AC97_EXTSTAT_VRA);
+
+	/* now write the sample rate
+	*/
+	wrcodec(s->codec, AC97_PCM_FRONT_DAC_RATE, (u16) rate);
+
+	/* I don't support different sample rates for multichannel,
+	 * so make these channels the same.
+	 */
+	if (dac->num_channels > 2)
+		wrcodec(s->codec, AC97_PCM_SURR_DAC_RATE, (u16) rate);
+	if (dac->num_channels > 4)
+		wrcodec(s->codec, AC97_PCM_LFE_DAC_RATE, (u16) rate);
+	/* read it back for actual supported rate
+	*/
+	dac_rate = rdcodec(s->codec, AC97_PCM_FRONT_DAC_RATE);
+
+	pr_debug("set_dac_rate: set to %d Hz\n", dac_rate);
+
+	/* some codec's don't allow unequal DAC and ADC rates, in which case
+	 * writing one rate reg actually changes both.
+	 */
+	adc_rate = rdcodec(s->codec, AC97_PCM_LR_ADC_RATE);
+
+	dac->sample_rate = dac_rate;
+	adc->sample_rate = adc_rate;
+}
+
+static void
+stop_dac(struct au1550_state *s)
+{
+	struct dmabuf  *db = &s->dma_dac;
+	u32		stat;
+	unsigned long   flags;
+
+	if (db->stopped)
+		return;
+
+	spin_lock_irqsave(&s->lock, flags);
+
+	au_writel(PSC_AC97PCR_TP, PSC_AC97PCR);
+	au_sync();
+
+	/* Wait for Transmit Busy to show disabled.
+	*/
+	do {
+		stat = readl((void *)PSC_AC97STAT);
+		au_sync();
+	} while ((stat & PSC_AC97STAT_TB) != 0);
+
+	au1xxx_dbdma_reset(db->dmanr);
+
+	db->stopped = 1;
+
+	spin_unlock_irqrestore(&s->lock, flags);
+}
+
+static void
+stop_adc(struct au1550_state *s)
+{
+	struct dmabuf  *db = &s->dma_adc;
+	unsigned long   flags;
+	u32		stat;
+
+	if (db->stopped)
+		return;
+
+	spin_lock_irqsave(&s->lock, flags);
+
+	au_writel(PSC_AC97PCR_RP, PSC_AC97PCR);
+	au_sync();
+
+	/* Wait for Receive Busy to show disabled.
+	*/
+	do {
+		stat = readl((void *)PSC_AC97STAT);
+		au_sync();
+	} while ((stat & PSC_AC97STAT_RB) != 0);
+
+	au1xxx_dbdma_reset(db->dmanr);
+
+	db->stopped = 1;
+
+	spin_unlock_irqrestore(&s->lock, flags);
+}
+
+
+static void
+set_xmit_slots(int num_channels)
+{
+	u32	ac97_config, stat;
+
+	ac97_config = au_readl(PSC_AC97CFG);
+	au_sync();
+	ac97_config &= ~(PSC_AC97CFG_TXSLOT_MASK | PSC_AC97CFG_DE_ENABLE);
+	au_writel(ac97_config, PSC_AC97CFG);
+	au_sync();
+
+	switch (num_channels) {
+	case 6:		/* stereo with surround and center/LFE,
+			 * slots 3,4,6,7,8,9
+			 */
+		ac97_config |= PSC_AC97CFG_TXSLOT_ENA(6);
+		ac97_config |= PSC_AC97CFG_TXSLOT_ENA(9);
+
+	case 4:		/* stereo with surround, slots 3,4,7,8 */
+		ac97_config |= PSC_AC97CFG_TXSLOT_ENA(7);
+		ac97_config |= PSC_AC97CFG_TXSLOT_ENA(8);
+
+	case 2:		/* stereo, slots 3,4 */
+	case 1:		/* mono */
+		ac97_config |= PSC_AC97CFG_TXSLOT_ENA(3);
+		ac97_config |= PSC_AC97CFG_TXSLOT_ENA(4);
+	}
+
+	au_writel(ac97_config, PSC_AC97CFG);
+	au_sync();
+
+	ac97_config |= PSC_AC97CFG_DE_ENABLE;
+	au_writel(ac97_config, PSC_AC97CFG);
+	au_sync();
+
+	/* Wait for Device ready.
+	*/
+	do {
+		stat = readl((void *)PSC_AC97STAT);
+		au_sync();
+	} while ((stat & PSC_AC97STAT_DR) == 0);
+}
+
+static void
+set_recv_slots(int num_channels)
+{
+	u32	ac97_config, stat;
+
+	ac97_config = au_readl(PSC_AC97CFG);
+	au_sync();
+	ac97_config &= ~(PSC_AC97CFG_RXSLOT_MASK | PSC_AC97CFG_DE_ENABLE);
+	au_writel(ac97_config, PSC_AC97CFG);
+	au_sync();
+
+	/* Always enable slots 3 and 4 (stereo). Slot 6 is
+	 * optional Mic ADC, which we don't support yet.
+	 */
+	ac97_config |= PSC_AC97CFG_RXSLOT_ENA(3);
+	ac97_config |= PSC_AC97CFG_RXSLOT_ENA(4);
+
+	au_writel(ac97_config, PSC_AC97CFG);
+	au_sync();
+
+	ac97_config |= PSC_AC97CFG_DE_ENABLE;
+	au_writel(ac97_config, PSC_AC97CFG);
+	au_sync();
+
+	/* Wait for Device ready.
+	*/
+	do {
+		stat = readl((void *)PSC_AC97STAT);
+		au_sync();
+	} while ((stat & PSC_AC97STAT_DR) == 0);
+}
+
+static void
+start_dac(struct au1550_state *s)
+{
+	struct dmabuf  *db = &s->dma_dac;
+	unsigned long   flags;
+
+	if (!db->stopped)
+		return;
+
+	spin_lock_irqsave(&s->lock, flags);
+
+	set_xmit_slots(db->num_channels);
+	au_writel(PSC_AC97PCR_TC, PSC_AC97PCR);
+	au_sync();
+	au_writel(PSC_AC97PCR_TS, PSC_AC97PCR);
+	au_sync();
+
+	au1xxx_dbdma_start(db->dmanr);
+
+	db->stopped = 0;
+
+	spin_unlock_irqrestore(&s->lock, flags);
+}
+
+static void
+start_adc(struct au1550_state *s)
+{
+	struct dmabuf  *db = &s->dma_adc;
+	int	i;
+
+	if (!db->stopped)
+		return;
+
+	/* Put two buffers on the ring to get things started.
+	*/
+	for (i=0; i<2; i++) {
+		au1xxx_dbdma_put_dest(db->dmanr, db->nextIn, db->dma_fragsize);
+
+		db->nextIn += db->dma_fragsize;
+		if (db->nextIn >= db->rawbuf + db->dmasize)
+			db->nextIn -= db->dmasize;
+	}
+
+	set_recv_slots(db->num_channels);
+	au1xxx_dbdma_start(db->dmanr);
+	au_writel(PSC_AC97PCR_RC, PSC_AC97PCR);
+	au_sync();
+	au_writel(PSC_AC97PCR_RS, PSC_AC97PCR);
+	au_sync();
+
+	db->stopped = 0;
+}
+
+static int
+prog_dmabuf(struct au1550_state *s, struct dmabuf *db)
+{
+	unsigned user_bytes_per_sec;
+	unsigned        bufs;
+	unsigned        rate = db->sample_rate;
+
+	if (!db->rawbuf) {
+		db->ready = db->mapped = 0;
+		db->buforder = 5;	/* 32 * PAGE_SIZE */
+		db->rawbuf = kmalloc((PAGE_SIZE << db->buforder), GFP_KERNEL);
+		if (!db->rawbuf)
+			return -ENOMEM;
+	}
+
+	db->cnt_factor = 1;
+	if (db->sample_size == 8)
+		db->cnt_factor *= 2;
+	if (db->num_channels == 1)
+		db->cnt_factor *= 2;
+	db->cnt_factor *= db->src_factor;
+
+	db->count = 0;
+	db->dma_qcount = 0;
+	db->nextIn = db->nextOut = db->rawbuf;
+
+	db->user_bytes_per_sample = (db->sample_size>>3) * db->num_channels;
+	db->dma_bytes_per_sample = 2 * ((db->num_channels == 1) ?
+					2 : db->num_channels);
+
+	user_bytes_per_sec = rate * db->user_bytes_per_sample;
+	bufs = PAGE_SIZE << db->buforder;
+	if (db->ossfragshift) {
+		if ((1000 << db->ossfragshift) < user_bytes_per_sec)
+			db->fragshift = ld2(user_bytes_per_sec/1000);
+		else
+			db->fragshift = db->ossfragshift;
+	} else {
+		db->fragshift = ld2(user_bytes_per_sec / 100 /
+				    (db->subdivision ? db->subdivision : 1));
+		if (db->fragshift < 3)
+			db->fragshift = 3;
+	}
+
+	db->fragsize = 1 << db->fragshift;
+	db->dma_fragsize = db->fragsize * db->cnt_factor;
+	db->numfrag = bufs / db->dma_fragsize;
+
+	while (db->numfrag < 4 && db->fragshift > 3) {
+		db->fragshift--;
+		db->fragsize = 1 << db->fragshift;
+		db->dma_fragsize = db->fragsize * db->cnt_factor;
+		db->numfrag = bufs / db->dma_fragsize;
+	}
+
+	if (db->ossmaxfrags >= 4 && db->ossmaxfrags < db->numfrag)
+		db->numfrag = db->ossmaxfrags;
+
+	db->dmasize = db->dma_fragsize * db->numfrag;
+	memset(db->rawbuf, 0, bufs);
+
+	pr_debug("prog_dmabuf: rate=%d, samplesize=%d, channels=%d\n",
+	    rate, db->sample_size, db->num_channels);
+	pr_debug("prog_dmabuf: fragsize=%d, cnt_factor=%d, dma_fragsize=%d\n",
+	    db->fragsize, db->cnt_factor, db->dma_fragsize);
+	pr_debug("prog_dmabuf: numfrag=%d, dmasize=%d\n", db->numfrag, db->dmasize);
+
+	db->ready = 1;
+	return 0;
+}
+
+static int
+prog_dmabuf_adc(struct au1550_state *s)
+{
+	stop_adc(s);
+	return prog_dmabuf(s, &s->dma_adc);
+
+}
+
+static int
+prog_dmabuf_dac(struct au1550_state *s)
+{
+	stop_dac(s);
+	return prog_dmabuf(s, &s->dma_dac);
+}
+
+
+/* hold spinlock for the following */
+static void
+dac_dma_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct au1550_state *s = (struct au1550_state *) dev_id;
+	struct dmabuf  *db = &s->dma_dac;
+	u32	ac97c_stat;
+
+	ac97c_stat = au_readl(PSC_AC97STAT);
+	if (ac97c_stat & (AC97C_XU | AC97C_XO | AC97C_TE))
+		pr_debug("AC97C status = 0x%08x\n", ac97c_stat);
+	db->dma_qcount--;
+
+	if (db->count >= db->fragsize) {
+		if (au1xxx_dbdma_put_source(db->dmanr, db->nextOut,
+							db->fragsize) == 0) {
+			err("qcount < 2 and no ring room!");
+		}
+		db->nextOut += db->fragsize;
+		if (db->nextOut >= db->rawbuf + db->dmasize)
+			db->nextOut -= db->dmasize;
+		db->count -= db->fragsize;
+		db->total_bytes += db->dma_fragsize;
+		db->dma_qcount++;
+	}
+
+	/* wake up anybody listening */
+	if (waitqueue_active(&db->wait))
+		wake_up(&db->wait);
+}
+
+
+static void
+adc_dma_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct	au1550_state *s = (struct au1550_state *)dev_id;
+	struct	dmabuf  *dp = &s->dma_adc;
+	u32	obytes;
+	char	*obuf;
+
+	/* Pull the buffer from the dma queue.
+	*/
+	au1xxx_dbdma_get_dest(dp->dmanr, (void *)(&obuf), &obytes);
+
+	if ((dp->count + obytes) > dp->dmasize) {
+		/* Overrun. Stop ADC and log the error
+		*/
+		stop_adc(s);
+		dp->error++;
+		err("adc overrun");
+		return;
+	}
+
+	/* Put a new empty buffer on the destination DMA.
+	*/
+	au1xxx_dbdma_put_dest(dp->dmanr, dp->nextIn, dp->dma_fragsize);
+
+	dp->nextIn += dp->dma_fragsize;
+	if (dp->nextIn >= dp->rawbuf + dp->dmasize)
+		dp->nextIn -= dp->dmasize;
+
+	dp->count += obytes;
+	dp->total_bytes += obytes;
+
+	/* wake up anybody listening
+	*/
+	if (waitqueue_active(&dp->wait))
+		wake_up(&dp->wait);
+
+}
+
+static loff_t
+au1550_llseek(struct file *file, loff_t offset, int origin)
+{
+	return -ESPIPE;
+}
+
+
+static int
+au1550_open_mixdev(struct inode *inode, struct file *file)
+{
+	file->private_data = &au1550_state;
+	return 0;
+}
+
+static int
+au1550_release_mixdev(struct inode *inode, struct file *file)
+{
+	return 0;
+}
+
+static int
+mixdev_ioctl(struct ac97_codec *codec, unsigned int cmd,
+                        unsigned long arg)
+{
+	return codec->mixer_ioctl(codec, cmd, arg);
+}
+
+static int
+au1550_ioctl_mixdev(struct inode *inode, struct file *file,
+			       unsigned int cmd, unsigned long arg)
+{
+	struct au1550_state *s = (struct au1550_state *)file->private_data;
+	struct ac97_codec *codec = s->codec;
+
+	return mixdev_ioctl(codec, cmd, arg);
+}
+
+static /*const */ struct file_operations au1550_mixer_fops = {
+	owner:THIS_MODULE,
+	llseek:au1550_llseek,
+	ioctl:au1550_ioctl_mixdev,
+	open:au1550_open_mixdev,
+	release:au1550_release_mixdev,
+};
+
+static int
+drain_dac(struct au1550_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 <= s->dma_dac.fragsize)
+			break;
+		if (signal_pending(current))
+			break;
+		if (nonblock)
+			return -EBUSY;
+		tmo = 1000 * count / (s->no_vra ?
+				      48000 : s->dma_dac.sample_rate);
+		tmo /= s->dma_dac.dma_bytes_per_sample;
+		au1550_delay(tmo);
+	}
+	if (signal_pending(current))
+		return -ERESTARTSYS;
+	return 0;
+}
+
+static inline u8 S16_TO_U8(s16 ch)
+{
+	return (u8) (ch >> 8) + 0x80;
+}
+static inline s16 U8_TO_S16(u8 ch)
+{
+	return (s16) (ch - 0x80) << 8;
+}
+
+/*
+ * Translates user samples to dma buffer suitable for AC'97 DAC data:
+ *     If mono, copy left channel to right channel in dma buffer.
+ *     If 8 bit samples, cvt to 16-bit before writing to dma buffer.
+ *     If interpolating (no VRA), duplicate every audio frame src_factor times.
+ */
+static int
+translate_from_user(struct dmabuf *db, char* dmabuf, char* userbuf,
+							       int dmacount)
+{
+	int             sample, i;
+	int             interp_bytes_per_sample;
+	int             num_samples;
+	int             mono = (db->num_channels == 1);
+	char            usersample[12];
+	s16             ch, dmasample[6];
+
+	if (db->sample_size == 16 && !mono && db->src_factor == 1) {
+		/* no translation necessary, just copy
+		*/
+		if (copy_from_user(dmabuf, userbuf, dmacount))
+			return -EFAULT;
+		return dmacount;
+	}
+
+	interp_bytes_per_sample = db->dma_bytes_per_sample * db->src_factor;
+	num_samples = dmacount / interp_bytes_per_sample;
+
+	for (sample = 0; sample < num_samples; sample++) {
+		if (copy_from_user(usersample, userbuf,
+				   db->user_bytes_per_sample)) {
+			return -EFAULT;
+		}
+
+		for (i = 0; i < db->num_channels; i++) {
+			if (db->sample_size == 8)
+				ch = U8_TO_S16(usersample[i]);
+			else
+				ch = *((s16 *) (&usersample[i * 2]));
+			dmasample[i] = ch;
+			if (mono)
+				dmasample[i + 1] = ch;	/* right channel */
+		}
+
+		/* duplicate every audio frame src_factor times
+		*/
+		for (i = 0; i < db->src_factor; i++)
+			memcpy(dmabuf, dmasample, db->dma_bytes_per_sample);
+
+		userbuf += db->user_bytes_per_sample;
+		dmabuf += interp_bytes_per_sample;
+	}
+
+	return num_samples * interp_bytes_per_sample;
+}
+
+/*
+ * Translates AC'97 ADC samples to user buffer:
+ *     If mono, send only left channel to user buffer.
+ *     If 8 bit samples, cvt from 16 to 8 bit before writing to user buffer.
+ *     If decimating (no VRA), skip over src_factor audio frames.
+ */
+static int
+translate_to_user(struct dmabuf *db, char* userbuf, char* dmabuf,
+							     int dmacount)
+{
+	int             sample, i;
+	int             interp_bytes_per_sample;
+	int             num_samples;
+	int             mono = (db->num_channels == 1);
+	char            usersample[12];
+
+	if (db->sample_size == 16 && !mono && db->src_factor == 1) {
+		/* no translation necessary, just copy
+		*/
+		if (copy_to_user(userbuf, dmabuf, dmacount))
+			return -EFAULT;
+		return dmacount;
+	}
+
+	interp_bytes_per_sample = db->dma_bytes_per_sample * db->src_factor;
+	num_samples = dmacount / interp_bytes_per_sample;
+
+	for (sample = 0; sample < num_samples; sample++) {
+		for (i = 0; i < db->num_channels; i++) {
+			if (db->sample_size == 8)
+				usersample[i] =
+					S16_TO_U8(*((s16 *) (&dmabuf[i * 2])));
+			else
+				*((s16 *) (&usersample[i * 2])) =
+					*((s16 *) (&dmabuf[i * 2]));
+		}
+
+		if (copy_to_user(userbuf, usersample,
+				 db->user_bytes_per_sample)) {
+			return -EFAULT;
+		}
+
+		userbuf += db->user_bytes_per_sample;
+		dmabuf += interp_bytes_per_sample;
+	}
+
+	return num_samples * interp_bytes_per_sample;
+}
+
+/*
+ * 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;
+	int             cnt, ret;
+
+	if (bufptr + count > bufend) {
+		int             partial = (int) (bufend - bufptr);
+		if (to_user) {
+			if ((cnt = translate_to_user(db, userbuf,
+						     bufptr, partial)) < 0)
+				return cnt;
+			ret = cnt;
+			if ((cnt = translate_to_user(db, userbuf + partial,
+						     db->rawbuf,
+						     count - partial)) < 0)
+				return cnt;
+			ret += cnt;
+		} else {
+			if ((cnt = translate_from_user(db, bufptr, userbuf,
+						       partial)) < 0)
+				return cnt;
+			ret = cnt;
+			if ((cnt = translate_from_user(db, db->rawbuf,
+						       userbuf + partial,
+						       count - partial)) < 0)
+				return cnt;
+			ret += cnt;
+		}
+	} else {
+		if (to_user)
+			ret = translate_to_user(db, userbuf, bufptr, count);
+		else
+			ret = translate_from_user(db, bufptr, userbuf, count);
+	}
+
+	return ret;
+}
+
+
+static ssize_t
+au1550_read(struct file *file, char *buffer, size_t count, loff_t *ppos)
+{
+	struct au1550_state *s = (struct au1550_state *)file->private_data;
+	struct dmabuf  *db = &s->dma_adc;
+	DECLARE_WAITQUEUE(wait, current);
+	ssize_t         ret;
+	unsigned long   flags;
+	int             cnt, usercnt, avail;
+
+	if (db->mapped)
+		return -ENXIO;
+	if (!access_ok(VERIFY_WRITE, buffer, count))
+		return -EFAULT;
+	ret = 0;
+
+	count *= db->cnt_factor;
+
+	down(&s->sem);
+	add_wait_queue(&db->wait, &wait);
+
+	while (count > 0) {
+		/* wait for samples in ADC dma buffer
+		*/
+		do {
+			if (db->stopped)
+				start_adc(s);
+			spin_lock_irqsave(&s->lock, flags);
+			avail = db->count;
+			if (avail <= 0)
+				__set_current_state(TASK_INTERRUPTIBLE);
+			spin_unlock_irqrestore(&s->lock, flags);
+			if (avail <= 0) {
+				if (file->f_flags & O_NONBLOCK) {
+					if (!ret)
+						ret = -EAGAIN;
+					goto out;
+				}
+				up(&s->sem);
+				schedule();
+				if (signal_pending(current)) {
+					if (!ret)
+						ret = -ERESTARTSYS;
+					goto out2;
+				}
+				down(&s->sem);
+			}
+		} 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;
+			goto out;
+		}
+
+		spin_lock_irqsave(&s->lock, flags);
+		db->count -= cnt;
+		db->nextOut += cnt;
+		if (db->nextOut >= db->rawbuf + db->dmasize)
+			db->nextOut -= db->dmasize;
+		spin_unlock_irqrestore(&s->lock, flags);
+
+		count -= cnt;
+		usercnt = cnt / db->cnt_factor;
+		buffer += usercnt;
+		ret += usercnt;
+	}			/* while (count > 0) */
+
+out:
+	up(&s->sem);
+out2:
+	remove_wait_queue(&db->wait, &wait);
+	set_current_state(TASK_RUNNING);
+	return ret;
+}
+
+static ssize_t
+au1550_write(struct file *file, const char *buffer, size_t count, loff_t * ppos)
+{
+	struct au1550_state *s = (struct au1550_state *)file->private_data;
+	struct dmabuf  *db = &s->dma_dac;
+	DECLARE_WAITQUEUE(wait, current);
+	ssize_t         ret = 0;
+	unsigned long   flags;
+	int             cnt, usercnt, avail;
+
+	pr_debug("write: count=%d\n", count);
+
+	if (db->mapped)
+		return -ENXIO;
+	if (!access_ok(VERIFY_READ, buffer, count))
+		return -EFAULT;
+
+	count *= db->cnt_factor;
+
+	down(&s->sem);
+	add_wait_queue(&db->wait, &wait);
+
+	while (count > 0) {
+		/* wait for space in playback buffer
+		*/
+		do {
+			spin_lock_irqsave(&s->lock, flags);
+			avail = (int) db->dmasize - db->count;
+			if (avail <= 0)
+				__set_current_state(TASK_INTERRUPTIBLE);
+			spin_unlock_irqrestore(&s->lock, flags);
+			if (avail <= 0) {
+				if (file->f_flags & O_NONBLOCK) {
+					if (!ret)
+						ret = -EAGAIN;
+					goto out;
+				}
+				up(&s->sem);
+				schedule();
+				if (signal_pending(current)) {
+					if (!ret)
+						ret = -ERESTARTSYS;
+					goto out2;
+				}
+				down(&s->sem);
+			}
+		} while (avail <= 0);
+
+		/* copy from user to nextIn
+		*/
+		if ((cnt = copy_dmabuf_user(db, (char *) buffer,
+					    count > avail ?
+					    avail : count, 0)) < 0) {
+			if (!ret)
+				ret = -EFAULT;
+			goto out;
+		}
+
+		spin_lock_irqsave(&s->lock, flags);
+		db->count += cnt;
+		db->nextIn += cnt;
+		if (db->nextIn >= db->rawbuf + db->dmasize)
+			db->nextIn -= db->dmasize;
+
+		/* If the data is available, we want to keep two buffers
+		 * on the dma queue.  If the queue count reaches zero,
+		 * we know the dma has stopped.
+		 */
+		while ((db->dma_qcount < 2) && (db->count >= db->fragsize)) {
+			if (au1xxx_dbdma_put_source(db->dmanr, db->nextOut,
+							db->fragsize) == 0) {
+				err("qcount < 2 and no ring room!");
+			}
+			db->nextOut += db->fragsize;
+			if (db->nextOut >= db->rawbuf + db->dmasize)
+				db->nextOut -= db->dmasize;
+			db->total_bytes += db->dma_fragsize;
+			if (db->dma_qcount == 0)
+				start_dac(s);
+			db->dma_qcount++;
+		}
+		spin_unlock_irqrestore(&s->lock, flags);
+
+		count -= cnt;
+		usercnt = cnt / db->cnt_factor;
+		buffer += usercnt;
+		ret += usercnt;
+	}			/* while (count > 0) */
+
+out:
+	up(&s->sem);
+out2:
+	remove_wait_queue(&db->wait, &wait);
+	set_current_state(TASK_RUNNING);
+	return ret;
+}
+
+
+/* No kernel lock - we have our own spinlock */
+static unsigned int
+au1550_poll(struct file *file, struct poll_table_struct *wait)
+{
+	struct au1550_state *s = (struct au1550_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.dma_fragsize)
+			mask |= POLLIN | POLLRDNORM;
+	}
+	if (file->f_mode & FMODE_WRITE) {
+		if (s->dma_dac.mapped) {
+			if (s->dma_dac.count >=
+			    (signed)s->dma_dac.dma_fragsize)
+				mask |= POLLOUT | POLLWRNORM;
+		} else {
+			if ((signed) s->dma_dac.dmasize >=
+			    s->dma_dac.count + (signed)s->dma_dac.dma_fragsize)
+				mask |= POLLOUT | POLLWRNORM;
+		}
+	}
+	spin_unlock_irqrestore(&s->lock, flags);
+	return mask;
+}
+
+static int
+au1550_mmap(struct file *file, struct vm_area_struct *vma)
+{
+	struct au1550_state *s = (struct au1550_state *)file->private_data;
+	struct dmabuf  *db;
+	unsigned long   size;
+	int ret = 0;
+
+	lock_kernel();
+	down(&s->sem);
+	if (vma->vm_flags & VM_WRITE)
+		db = &s->dma_dac;
+	else if (vma->vm_flags & VM_READ)
+		db = &s->dma_adc;
+	else {
+		ret = -EINVAL;
+		goto out;
+	}
+	if (vma->vm_pgoff != 0) {
+		ret = -EINVAL;
+		goto out;
+	}
+	size = vma->vm_end - vma->vm_start;
+	if (size > (PAGE_SIZE << db->buforder)) {
+		ret = -EINVAL;
+		goto out;
+	}
+	if (remap_pfn_range(vma, vma->vm_start, page_to_pfn(virt_to_page(db->rawbuf)),
+			     size, vma->vm_page_prot)) {
+		ret = -EAGAIN;
+		goto out;
+	}
+	vma->vm_flags &= ~VM_IO;
+	db->mapped = 1;
+out:
+	up(&s->sem);
+	unlock_kernel();
+	return ret;
+}
+
+#ifdef 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
+dma_count_done(struct dmabuf *db)
+{
+	if (db->stopped)
+		return 0;
+
+	return db->dma_fragsize - au1xxx_get_dma_residue(db->dmanr);
+}
+
+
+static int
+au1550_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
+							unsigned long arg)
+{
+	struct au1550_state *s = (struct au1550_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 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]))
+		pr_debug("ioctl %s, arg=0x%lxn", ioctl_str[count].str, arg);
+	else
+		pr_debug("ioctl 0x%x unknown, arg=0x%lx\n", cmd, arg);
+#endif
+
+	switch (cmd) {
+	case OSS_GETVERSION:
+		return put_user(SOUND_VERSION, (int *) arg);
+
+	case SNDCTL_DSP_SYNC:
+		if (file->f_mode & FMODE_WRITE)
+			return drain_dac(s, file->f_flags & O_NONBLOCK);
+		return 0;
+
+	case SNDCTL_DSP_SETDUPLEX:
+		return 0;
+
+	case SNDCTL_DSP_GETCAPS:
+		return put_user(DSP_CAP_DUPLEX | DSP_CAP_REALTIME |
+				DSP_CAP_TRIGGER | DSP_CAP_MMAP, (int *)arg);
+
+	case SNDCTL_DSP_RESET:
+		if (file->f_mode & FMODE_WRITE) {
+			stop_dac(s);
+			synchronize_irq();
+			s->dma_dac.count = s->dma_dac.total_bytes = 0;
+			s->dma_dac.nextIn = s->dma_dac.nextOut =
+				s->dma_dac.rawbuf;
+		}
+		if (file->f_mode & FMODE_READ) {
+			stop_adc(s);
+			synchronize_irq();
+			s->dma_adc.count = s->dma_adc.total_bytes = 0;
+			s->dma_adc.nextIn = s->dma_adc.nextOut =
+				s->dma_adc.rawbuf;
+		}
+		return 0;
+
+	case SNDCTL_DSP_SPEED:
+		if (get_user(val, (int *) arg))
+			return -EFAULT;
+		if (val >= 0) {
+			if (file->f_mode & FMODE_READ) {
+				stop_adc(s);
+				set_adc_rate(s, val);
+			}
+			if (file->f_mode & FMODE_WRITE) {
+				stop_dac(s);
+				set_dac_rate(s, val);
+			}
+			if (s->open_mode & FMODE_READ)
+				if ((ret = prog_dmabuf_adc(s)))
+					return ret;
+			if (s->open_mode & FMODE_WRITE)
+				if ((ret = prog_dmabuf_dac(s)))
+					return ret;
+		}
+		return put_user((file->f_mode & FMODE_READ) ?
+				s->dma_adc.sample_rate :
+				s->dma_dac.sample_rate,
+				(int *)arg);
+
+	case SNDCTL_DSP_STEREO:
+		if (get_user(val, (int *) arg))
+			return -EFAULT;
+		if (file->f_mode & FMODE_READ) {
+			stop_adc(s);
+			s->dma_adc.num_channels = val ? 2 : 1;
+			if ((ret = prog_dmabuf_adc(s)))
+				return ret;
+		}
+		if (file->f_mode & FMODE_WRITE) {
+			stop_dac(s);
+			s->dma_dac.num_channels = val ? 2 : 1;
+			if (s->codec_ext_caps & AC97_EXT_DACS) {
+				/* disable surround and center/lfe in AC'97
+				*/
+				u16 ext_stat = rdcodec(s->codec,
+						       AC97_EXTENDED_STATUS);
+				wrcodec(s->codec, AC97_EXTENDED_STATUS,
+					ext_stat | (AC97_EXTSTAT_PRI |
+						    AC97_EXTSTAT_PRJ |
+						    AC97_EXTSTAT_PRK));
+			}
+			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) {
+				if (val < 0 || val > 2)
+					return -EINVAL;
+				stop_adc(s);
+				s->dma_adc.num_channels = val;
+				if ((ret = prog_dmabuf_adc(s)))
+					return ret;
+			}
+			if (file->f_mode & FMODE_WRITE) {
+				switch (val) {
+				case 1:
+				case 2:
+					break;
+				case 3:
+				case 5:
+					return -EINVAL;
+				case 4:
+					if (!(s->codec_ext_caps &
+					      AC97_EXTID_SDAC))
+						return -EINVAL;
+					break;
+				case 6:
+					if ((s->codec_ext_caps &
+					     AC97_EXT_DACS) != AC97_EXT_DACS)
+						return -EINVAL;
+					break;
+				default:
+					return -EINVAL;
+				}
+
+				stop_dac(s);
+				if (val <= 2 &&
+				    (s->codec_ext_caps & AC97_EXT_DACS)) {
+					/* disable surround and center/lfe
+					 * channels in AC'97
+					 */
+					u16             ext_stat =
+						rdcodec(s->codec,
+							AC97_EXTENDED_STATUS);
+					wrcodec(s->codec,
+						AC97_EXTENDED_STATUS,
+						ext_stat | (AC97_EXTSTAT_PRI |
+							    AC97_EXTSTAT_PRJ |
+							    AC97_EXTSTAT_PRK));
+				} else if (val >= 4) {
+					/* enable surround, center/lfe
+					 * channels in AC'97
+					 */
+					u16             ext_stat =
+						rdcodec(s->codec,
+							AC97_EXTENDED_STATUS);
+					ext_stat &= ~AC97_EXTSTAT_PRJ;
+					if (val == 6)
+						ext_stat &=
+							~(AC97_EXTSTAT_PRI |
+							  AC97_EXTSTAT_PRK);
+					wrcodec(s->codec,
+						AC97_EXTENDED_STATUS,
+						ext_stat);
+				}
+
+				s->dma_dac.num_channels = val;
+				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->dma_adc.sample_size = 16;
+				else {
+					val = AFMT_U8;
+					s->dma_adc.sample_size = 8;
+				}
+				if ((ret = prog_dmabuf_adc(s)))
+					return ret;
+			}
+			if (file->f_mode & FMODE_WRITE) {
+				stop_dac(s);
+				if (val == AFMT_S16_LE)
+					s->dma_dac.sample_size = 16;
+				else {
+					val = AFMT_U8;
+					s->dma_dac.sample_size = 8;
+				}
+				if ((ret = prog_dmabuf_dac(s)))
+					return ret;
+			}
+		} else {
+			if (file->f_mode & FMODE_READ)
+				val = (s->dma_adc.sample_size == 16) ?
+					AFMT_S16_LE : AFMT_U8;
+			else
+				val = (s->dma_dac.sample_size == 16) ?
+					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;
+		count -= dma_count_done(&s->dma_dac);
+		spin_unlock_irqrestore(&s->lock, flags);
+		if (count < 0)
+			count = 0;
+		abinfo.bytes = (s->dma_dac.dmasize - count) /
+			s->dma_dac.cnt_factor;
+		abinfo.fragstotal = s->dma_dac.numfrag;
+		abinfo.fragments = abinfo.bytes >> s->dma_dac.fragshift;
+		pr_debug("ioctl SNDCTL_DSP_GETOSPACE: bytes=%d, fragments=%d\n", abinfo.bytes, abinfo.fragments);
+		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;
+		count += dma_count_done(&s->dma_adc);
+		spin_unlock_irqrestore(&s->lock, flags);
+		if (count < 0)
+			count = 0;
+		abinfo.bytes = count / s->dma_adc.cnt_factor;
+		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;
+		count -= dma_count_done(&s->dma_dac);
+		spin_unlock_irqrestore(&s->lock, flags);
+		if (count < 0)
+			count = 0;
+		count /= s->dma_dac.cnt_factor;
+		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 = dma_count_done(&s->dma_adc);
+			count += diff;
+			cinfo.bytes += diff;
+			cinfo.ptr =  virt_to_phys(s->dma_adc.nextIn) + diff -
+				virt_to_phys(s->dma_adc.rawbuf);
+		} else
+			cinfo.ptr = virt_to_phys(s->dma_adc.nextIn) -
+				virt_to_phys(s->dma_adc.rawbuf);
+		if (s->dma_adc.mapped)
+			s->dma_adc.count &= (s->dma_adc.dma_fragsize-1);
+		spin_unlock_irqrestore(&s->lock, flags);
+		if (count < 0)
+			count = 0;
+		cinfo.blocks = count >> s->dma_adc.fragshift;
+		return copy_to_user((void *) arg, &cinfo, sizeof(cinfo));
+
+	case SNDCTL_DSP_GETOPTR:
+		if (!(file->f_mode & FMODE_READ))
+			return -EINVAL;
+		spin_lock_irqsave(&s->lock, flags);
+		cinfo.bytes = s->dma_dac.total_bytes;
+		count = s->dma_dac.count;
+		if (!s->dma_dac.stopped) {
+			diff = dma_count_done(&s->dma_dac);
+			count -= diff;
+			cinfo.bytes += diff;
+			cinfo.ptr = virt_to_phys(s->dma_dac.nextOut) + diff -
+				virt_to_phys(s->dma_dac.rawbuf);
+		} else
+			cinfo.ptr = virt_to_phys(s->dma_dac.nextOut) -
+				virt_to_phys(s->dma_dac.rawbuf);
+		if (s->dma_dac.mapped)
+			s->dma_dac.count &= (s->dma_dac.dma_fragsize-1);
+		spin_unlock_irqrestore(&s->lock, flags);
+		if (count < 0)
+			count = 0;
+		cinfo.blocks = count >> s->dma_dac.fragshift;
+		return copy_to_user((void *) arg, &cinfo, sizeof(cinfo));
+
+	case SNDCTL_DSP_GETBLKSIZE:
+		if (file->f_mode & FMODE_WRITE)
+			return put_user(s->dma_dac.fragsize, (int *) arg);
+		else
+			return put_user(s->dma_adc.fragsize, (int *) arg);
+
+	case SNDCTL_DSP_SETFRAGMENT:
+		if (get_user(val, (int *) arg))
+			return -EFAULT;
+		if (file->f_mode & FMODE_READ) {
+			stop_adc(s);
+			s->dma_adc.ossfragshift = val & 0xffff;
+			s->dma_adc.ossmaxfrags = (val >> 16) & 0xffff;
+			if (s->dma_adc.ossfragshift < 4)
+				s->dma_adc.ossfragshift = 4;
+			if (s->dma_adc.ossfragshift > 15)
+				s->dma_adc.ossfragshift = 15;
+			if (s->dma_adc.ossmaxfrags < 4)
+				s->dma_adc.ossmaxfrags = 4;
+			if ((ret = prog_dmabuf_adc(s)))
+				return ret;
+		}
+		if (file->f_mode & FMODE_WRITE) {
+			stop_dac(s);
+			s->dma_dac.ossfragshift = val & 0xffff;
+			s->dma_dac.ossmaxfrags = (val >> 16) & 0xffff;
+			if (s->dma_dac.ossfragshift < 4)
+				s->dma_dac.ossfragshift = 4;
+			if (s->dma_dac.ossfragshift > 15)
+				s->dma_dac.ossfragshift = 15;
+			if (s->dma_dac.ossmaxfrags < 4)
+				s->dma_dac.ossmaxfrags = 4;
+			if ((ret = prog_dmabuf_dac(s)))
+				return ret;
+		}
+		return 0;
+
+	case SNDCTL_DSP_SUBDIVIDE:
+		if ((file->f_mode & FMODE_READ && s->dma_adc.subdivision) ||
+		    (file->f_mode & FMODE_WRITE && s->dma_dac.subdivision))
+			return -EINVAL;
+		if (get_user(val, (int *) arg))
+			return -EFAULT;
+		if (val != 1 && val != 2 && val != 4)
+			return -EINVAL;
+		if (file->f_mode & FMODE_READ) {
+			stop_adc(s);
+			s->dma_adc.subdivision = val;
+			if ((ret = prog_dmabuf_adc(s)))
+				return ret;
+		}
+		if (file->f_mode & FMODE_WRITE) {
+			stop_dac(s);
+			s->dma_dac.subdivision = val;
+			if ((ret = prog_dmabuf_dac(s)))
+				return ret;
+		}
+		return 0;
+
+	case SOUND_PCM_READ_RATE:
+		return put_user((file->f_mode & FMODE_READ) ?
+				s->dma_adc.sample_rate :
+				s->dma_dac.sample_rate,
+				(int *)arg);
+
+	case SOUND_PCM_READ_CHANNELS:
+		if (file->f_mode & FMODE_READ)
+			return put_user(s->dma_adc.num_channels, (int *)arg);
+		else
+			return put_user(s->dma_dac.num_channels, (int *)arg);
+
+	case SOUND_PCM_READ_BITS:
+		if (file->f_mode & FMODE_READ)
+			return put_user(s->dma_adc.sample_size, (int *)arg);
+		else
+			return put_user(s->dma_dac.sample_size, (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
+au1550_open(struct inode *inode, struct file *file)
+{
+	int             minor = MINOR(inode->i_rdev);
+	DECLARE_WAITQUEUE(wait, current);
+	struct au1550_state *s = &au1550_state;
+	int             ret;
+
+#ifdef DEBUG
+	if (file->f_flags & O_NONBLOCK)
+		pr_debug("open: non-blocking\n");
+	else
+		pr_debug("open: blocking\n");
+#endif
+
+	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);
+	}
+
+	stop_dac(s);
+	stop_adc(s);
+
+	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->dma_adc.num_channels = 1;
+		s->dma_adc.sample_size = 8;
+		set_adc_rate(s, 8000);
+		if ((minor & 0xf) == SND_DEV_DSP16)
+			s->dma_adc.sample_size = 16;
+	}
+
+	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->dma_dac.num_channels = 1;
+		s->dma_dac.sample_size = 8;
+		set_dac_rate(s, 8000);
+		if ((minor & 0xf) == SND_DEV_DSP16)
+			s->dma_dac.sample_size = 16;
+	}
+
+	if (file->f_mode & FMODE_READ) {
+		if ((ret = prog_dmabuf_adc(s)))
+			return ret;
+	}
+	if (file->f_mode & FMODE_WRITE) {
+		if ((ret = prog_dmabuf_dac(s)))
+			return ret;
+	}
+
+	s->open_mode |= file->f_mode & (FMODE_READ | FMODE_WRITE);
+	up(&s->open_sem);
+	init_MUTEX(&s->sem);
+	return 0;
+}
+
+static int
+au1550_release(struct inode *inode, struct file *file)
+{
+	struct au1550_state *s = (struct au1550_state *)file->private_data;
+
+	lock_kernel();
+
+	if (file->f_mode & FMODE_WRITE) {
+		unlock_kernel();
+		drain_dac(s, file->f_flags & O_NONBLOCK);
+		lock_kernel();
+	}
+
+	down(&s->open_sem);
+	if (file->f_mode & FMODE_WRITE) {
+		stop_dac(s);
+		kfree(s->dma_dac.rawbuf);
+		s->dma_dac.rawbuf = NULL;
+	}
+	if (file->f_mode & FMODE_READ) {
+		stop_adc(s);
+		kfree(s->dma_adc.rawbuf);
+		s->dma_adc.rawbuf = NULL;
+	}
+	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 au1550_audio_fops = {
+	owner:		THIS_MODULE,
+	llseek:		au1550_llseek,
+	read:		au1550_read,
+	write:		au1550_write,
+	poll:		au1550_poll,
+	ioctl:		au1550_ioctl,
+	mmap:		au1550_mmap,
+	open:		au1550_open,
+	release:	au1550_release,
+};
+
+MODULE_AUTHOR("Advanced Micro Devices (AMD), dan@embeddededge.com");
+MODULE_DESCRIPTION("Au1550 AC97 Audio Driver");
+
+static int __devinit
+au1550_probe(void)
+{
+	struct au1550_state *s = &au1550_state;
+	int             val;
+
+	memset(s, 0, sizeof(struct au1550_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->codec = ac97_alloc_codec();
+	if(s->codec == NULL) {
+		err("Out of memory");
+		return -1;
+	}
+	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_mem_region(CPHYSADDR(AC97_PSC_SEL),
+			    0x30, "Au1550 AC97")) {
+		err("AC'97 ports in use");
+	}
+
+	/* Allocate the DMA Channels
+	*/
+	if ((s->dma_dac.dmanr = au1xxx_dbdma_chan_alloc(DBDMA_MEM_CHAN,
+	    DBDMA_AC97_TX_CHAN, dac_dma_interrupt, (void *)s)) == 0) {
+		err("Can't get DAC DMA");
+		goto err_dma1;
+	}
+	au1xxx_dbdma_set_devwidth(s->dma_dac.dmanr, 16);
+	if (au1xxx_dbdma_ring_alloc(s->dma_dac.dmanr,
+					NUM_DBDMA_DESCRIPTORS) == 0) {
+		err("Can't get DAC DMA descriptors");
+		goto err_dma1;
+	}
+
+	if ((s->dma_adc.dmanr = au1xxx_dbdma_chan_alloc(DBDMA_AC97_RX_CHAN,
+	    DBDMA_MEM_CHAN, adc_dma_interrupt, (void *)s)) == 0) {
+		err("Can't get ADC DMA");
+		goto err_dma2;
+	}
+	au1xxx_dbdma_set_devwidth(s->dma_adc.dmanr, 16);
+	if (au1xxx_dbdma_ring_alloc(s->dma_adc.dmanr,
+					NUM_DBDMA_DESCRIPTORS) == 0) {
+		err("Can't get ADC DMA descriptors");
+		goto err_dma2;
+	}
+
+	pr_info("DAC: DMA%d, ADC: DMA%d", DBDMA_AC97_TX_CHAN, DBDMA_AC97_RX_CHAN);
+
+	/* register devices */
+
+	if ((s->dev_audio = register_sound_dsp(&au1550_audio_fops, -1)) < 0)
+		goto err_dev1;
+	if ((s->codec->dev_mixer =
+	     register_sound_mixer(&au1550_mixer_fops, -1)) < 0)
+		goto err_dev2;
+
+	/* The GPIO for the appropriate PSC was configured by the
+	 * board specific start up.
+	 *
+	 * configure PSC for AC'97
+	 */
+	au_writel(0, AC97_PSC_CTRL);	/* Disable PSC */
+	au_sync();
+	au_writel((PSC_SEL_CLK_SERCLK | PSC_SEL_PS_AC97MODE), AC97_PSC_SEL);
+	au_sync();
+
+	/* cold reset the AC'97
+	*/
+	au_writel(PSC_AC97RST_RST, PSC_AC97RST);
+	au_sync();
+	au1550_delay(10);
+	au_writel(0, PSC_AC97RST);
+	au_sync();
+
+	/* need to delay around 500msec(bleech) to give
+	   some CODECs enough time to wakeup */
+	au1550_delay(500);
+
+	/* warm reset the AC'97 to start the bitclk
+	*/
+	au_writel(PSC_AC97RST_SNC, PSC_AC97RST);
+	au_sync();
+	udelay(100);
+	au_writel(0, PSC_AC97RST);
+	au_sync();
+
+	/* Enable PSC
+	*/
+	au_writel(PSC_CTRL_ENABLE, AC97_PSC_CTRL);
+	au_sync();
+
+	/* Wait for PSC ready.
+	*/
+	do {
+		val = readl((void *)PSC_AC97STAT);
+		au_sync();
+	} while ((val & PSC_AC97STAT_SR) == 0);
+
+	/* Configure AC97 controller.
+	 * Deep FIFO, 16-bit sample, DMA, make sure DMA matches fifo size.
+	 */
+	val = PSC_AC97CFG_SET_LEN(16);
+	val |= PSC_AC97CFG_RT_FIFO8 | PSC_AC97CFG_TT_FIFO8;
+
+	/* Enable device so we can at least
+	 * talk over the AC-link.
+	 */
+	au_writel(val, PSC_AC97CFG);
+	au_writel(PSC_AC97MSK_ALLMASK, PSC_AC97MSK);
+	au_sync();
+	val |= PSC_AC97CFG_DE_ENABLE;
+	au_writel(val, PSC_AC97CFG);
+	au_sync();
+
+	/* Wait for Device ready.
+	*/
+	do {
+		val = readl((void *)PSC_AC97STAT);
+		au_sync();
+	} while ((val & PSC_AC97STAT_DR) == 0);
+
+	/* codec init */
+	if (!ac97_probe_codec(s->codec))
+		goto err_dev3;
+
+	s->codec_base_caps = rdcodec(s->codec, AC97_RESET);
+	s->codec_ext_caps = rdcodec(s->codec, AC97_EXTENDED_ID);
+	pr_info("AC'97 Base/Extended ID = %04x/%04x",
+	     s->codec_base_caps, s->codec_ext_caps);
+
+	if (!(s->codec_ext_caps & AC97_EXTID_VRA)) {
+		/* codec does not support VRA
+		*/
+		s->no_vra = 1;
+	} else if (!vra) {
+		/* Boot option says disable VRA
+		*/
+		u16 ac97_extstat = rdcodec(s->codec, AC97_EXTENDED_STATUS);
+		wrcodec(s->codec, AC97_EXTENDED_STATUS,
+			ac97_extstat & ~AC97_EXTSTAT_VRA);
+		s->no_vra = 1;
+	}
+	if (s->no_vra)
+		pr_info("no VRA, interpolating and decimating");
+
+	/* set mic to be the recording source */
+	val = SOUND_MASK_MIC;
+	mixdev_ioctl(s->codec, SOUND_MIXER_WRITE_RECSRC,
+		     (unsigned long) &val);
+
+	return 0;
+
+ err_dev3:
+	unregister_sound_mixer(s->codec->dev_mixer);
+ err_dev2:
+	unregister_sound_dsp(s->dev_audio);
+ err_dev1:
+	au1xxx_dbdma_chan_free(s->dma_adc.dmanr);
+ err_dma2:
+	au1xxx_dbdma_chan_free(s->dma_dac.dmanr);
+ err_dma1:
+	release_mem_region(CPHYSADDR(AC97_PSC_SEL), 0x30);
+
+	ac97_release_codec(s->codec);
+	return -1;
+}
+
+static void __devinit
+au1550_remove(void)
+{
+	struct au1550_state *s = &au1550_state;
+
+	if (!s)
+		return;
+	synchronize_irq();
+	au1xxx_dbdma_chan_free(s->dma_adc.dmanr);
+	au1xxx_dbdma_chan_free(s->dma_dac.dmanr);
+	release_mem_region(CPHYSADDR(AC97_PSC_SEL), 0x30);
+	unregister_sound_dsp(s->dev_audio);
+	unregister_sound_mixer(s->codec->dev_mixer);
+	ac97_release_codec(s->codec);
+}
+
+static int __init
+init_au1550(void)
+{
+	return au1550_probe();
+}
+
+static void __exit
+cleanup_au1550(void)
+{
+	au1550_remove();
+}
+
+module_init(init_au1550);
+module_exit(cleanup_au1550);
+
+#ifndef MODULE
+
+static int __init
+au1550_setup(char *options)
+{
+	char           *this_opt;
+
+	if (!options || !*options)
+		return 0;
+
+	while ((this_opt = strsep(&options, ","))) {
+		if (!*this_opt)
+			continue;
+		if (!strncmp(this_opt, "vra", 3)) {
+			vra = 1;
+		}
+	}
+
+	return 1;
+}
+
+__setup("au1550_audio=", au1550_setup);
+
+#endif /* MODULE */