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!

3 files changed, 709 insertions, 0 deletions

diff --git a/sound/mips/Kconfig b/sound/mips/Kconfig
new file mode 100644
index 000000000000..531f8ba96a71
--- /dev/null
+++ b/sound/mips/Kconfig
@@ -0,0 +1,15 @@
+# ALSA MIPS drivers
+
+menu "ALSA MIPS devices"
+	depends on SND!=n && MIPS
+
+config SND_AU1X00
+	tristate "Au1x00 AC97 Port Driver"
+	depends on (SOC_AU1000 || SOC_AU1100 || SOC_AU1500) && SND
+	select SND_PCM
+	select SND_AC97_CODEC
+	help
+	  ALSA Sound driver for the Au1x00's AC97 port.
+
+endmenu
+
diff --git a/sound/mips/Makefile b/sound/mips/Makefile
new file mode 100644
index 000000000000..47afed971fba
--- /dev/null
+++ b/sound/mips/Makefile
@@ -0,0 +1,8 @@
+#
+# Makefile for ALSA
+#
+
+snd-au1x00-objs := au1x00.o
+
+# Toplevel Module Dependency
+obj-$(CONFIG_SND_AU1X00) += snd-au1x00.o
diff --git a/sound/mips/au1x00.c b/sound/mips/au1x00.c
new file mode 100644
index 000000000000..c20522b02134
--- /dev/null
+++ b/sound/mips/au1x00.c
@@ -0,0 +1,686 @@
+/*
+ * BRIEF MODULE DESCRIPTION
+ *  Driver for AMD Au1000 MIPS Processor, AC'97 Sound Port
+ *
+ * Copyright 2004 Cooper Street Innovations Inc.
+ * Author: Charles Eidsness	<charles@cooper-street.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.
+ *
+ * History:
+ *
+ * 2004-09-09 Charles Eidsness	-- Original verion -- based on
+ * 				  sa11xx-uda1341.c ALSA driver and the
+ *				  au1000.c OSS driver.
+ * 2004-09-09 Matt Porter	-- Added support for ALSA 1.0.6
+ *
+ */
+
+#include <linux/ioport.h>
+#include <linux/interrupt.h>
+#include <sound/driver.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/version.h>
+#include <sound/core.h>
+#include <sound/initval.h>
+#include <sound/pcm.h>
+#include <sound/ac97_codec.h>
+#include <asm/mach-au1x00/au1000.h>
+#include <asm/mach-au1x00/au1000_dma.h>
+
+MODULE_AUTHOR("Charles Eidsness <charles@cooper-street.com>");
+MODULE_DESCRIPTION("Au1000 AC'97 ALSA Driver");
+MODULE_LICENSE("GPL");
+#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,8)
+MODULE_SUPPORTED_DEVICE("{{AMD,Au1000 AC'97}}");
+#else
+MODULE_CLASSES("{sound}");
+MODULE_DEVICES("{{AMD,Au1000 AC'97}}");
+#endif
+
+#define chip_t au1000_t
+
+#define PLAYBACK 0
+#define CAPTURE 1
+#define AC97_SLOT_3 0x01
+#define AC97_SLOT_4 0x02
+#define AC97_SLOT_6 0x08
+#define AC97_CMD_IRQ 31
+#define READ 0
+#define WRITE 1
+#define READ_WAIT 2
+#define RW_DONE 3
+
+DECLARE_WAIT_QUEUE_HEAD(ac97_command_wq);
+
+typedef struct au1000_period au1000_period_t;
+struct au1000_period
+{
+	u32 start;
+	u32 relative_end;	/*realtive to start of buffer*/
+	au1000_period_t * next;
+};
+
+/*Au1000 AC97 Port Control Reisters*/
+typedef struct au1000_ac97_reg au1000_ac97_reg_t;
+struct au1000_ac97_reg {
+	u32 volatile config;
+	u32 volatile status;
+	u32 volatile data;
+	u32 volatile cmd;
+	u32 volatile cntrl;
+};
+
+typedef struct audio_stream audio_stream_t;
+struct audio_stream {
+	snd_pcm_substream_t * substream;
+	int dma;
+	spinlock_t dma_lock;
+	au1000_period_t * buffer;
+	unsigned long period_size;
+};
+
+typedef struct snd_card_au1000 {
+	snd_card_t *card;
+	au1000_ac97_reg_t volatile *ac97_ioport;
+
+	struct resource *ac97_res_port;
+	spinlock_t ac97_lock;
+	ac97_t *ac97;
+
+	snd_pcm_t *pcm;
+	audio_stream_t *stream[2];	/* playback & capture */
+} au1000_t;
+
+static au1000_t *au1000 = NULL;
+
+/*--------------------------- Local Functions --------------------------------*/
+static void
+au1000_set_ac97_xmit_slots(long xmit_slots)
+{
+	u32 volatile ac97_config;
+
+	spin_lock(&au1000->ac97_lock);
+	ac97_config = au1000->ac97_ioport->config;
+	ac97_config = ac97_config & ~AC97C_XMIT_SLOTS_MASK;
+	ac97_config |= (xmit_slots << AC97C_XMIT_SLOTS_BIT);
+	au1000->ac97_ioport->config = ac97_config;
+	spin_unlock(&au1000->ac97_lock);
+}
+
+static void
+au1000_set_ac97_recv_slots(long recv_slots)
+{
+	u32 volatile ac97_config;
+
+	spin_lock(&au1000->ac97_lock);
+	ac97_config = au1000->ac97_ioport->config;
+	ac97_config = ac97_config & ~AC97C_RECV_SLOTS_MASK;
+	ac97_config |= (recv_slots << AC97C_RECV_SLOTS_BIT);
+	au1000->ac97_ioport->config = ac97_config;
+	spin_unlock(&au1000->ac97_lock);
+}
+
+
+static void
+au1000_dma_stop(audio_stream_t *stream)
+{
+	unsigned long   flags;
+	au1000_period_t * pointer;
+	au1000_period_t * pointer_next;
+
+	if (stream->buffer != NULL) {
+		spin_lock_irqsave(&stream->dma_lock, flags);
+		disable_dma(stream->dma);
+		spin_unlock_irqrestore(&stream->dma_lock, flags);
+
+		pointer = stream->buffer;
+		pointer_next = stream->buffer->next;
+
+		do {
+			kfree(pointer);
+			pointer = pointer_next;
+			pointer_next = pointer->next;
+		} while (pointer != stream->buffer);
+
+		stream->buffer = NULL;
+	}
+}
+
+static void
+au1000_dma_start(audio_stream_t *stream)
+{
+	snd_pcm_substream_t *substream = stream->substream;
+	snd_pcm_runtime_t *runtime = substream->runtime;
+
+	unsigned long flags, dma_start;
+	int i;
+	au1000_period_t * pointer;
+
+	if (stream->buffer == NULL) {
+		dma_start = virt_to_phys(runtime->dma_area);
+
+		stream->period_size = frames_to_bytes(runtime,
+			runtime->period_size);
+		stream->buffer = kmalloc(sizeof(au1000_period_t), GFP_KERNEL);
+		pointer = stream->buffer;
+		for (i = 0 ; i < runtime->periods ; i++) {
+			pointer->start = (u32)(dma_start +
+				(i * stream->period_size));
+			pointer->relative_end = (u32)
+				(((i+1) * stream->period_size) - 0x1);
+			if ( i < runtime->periods - 1) {
+				pointer->next = kmalloc(sizeof(au1000_period_t)
+					, GFP_KERNEL);
+				pointer = pointer->next;
+			}
+		}
+		pointer->next = stream->buffer;
+
+		spin_lock_irqsave(&stream->dma_lock, flags);
+		init_dma(stream->dma);
+		if (get_dma_active_buffer(stream->dma) == 0) {
+			clear_dma_done0(stream->dma);
+			set_dma_addr0(stream->dma, stream->buffer->start);
+			set_dma_count0(stream->dma, stream->period_size >> 1);
+			set_dma_addr1(stream->dma, stream->buffer->next->start);
+			set_dma_count1(stream->dma, stream->period_size >> 1);
+		} else {
+			clear_dma_done1(stream->dma);
+			set_dma_addr1(stream->dma, stream->buffer->start);
+			set_dma_count1(stream->dma, stream->period_size >> 1);
+			set_dma_addr0(stream->dma, stream->buffer->next->start);
+			set_dma_count0(stream->dma, stream->period_size >> 1);
+		}
+		enable_dma_buffers(stream->dma);
+		start_dma(stream->dma);
+		spin_unlock_irqrestore(&stream->dma_lock, flags);
+	}
+}
+
+static irqreturn_t
+au1000_dma_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+	audio_stream_t *stream = (audio_stream_t *) dev_id;
+	snd_pcm_substream_t *substream = stream->substream;
+
+	spin_lock(&stream->dma_lock);
+	switch (get_dma_buffer_done(stream->dma)) {
+	case DMA_D0:
+		stream->buffer = stream->buffer->next;
+		clear_dma_done0(stream->dma);
+		set_dma_addr0(stream->dma, stream->buffer->next->start);
+		set_dma_count0(stream->dma, stream->period_size >> 1);
+		enable_dma_buffer0(stream->dma);
+		break;
+	case DMA_D1:
+		stream->buffer = stream->buffer->next;
+		clear_dma_done1(stream->dma);
+		set_dma_addr1(stream->dma, stream->buffer->next->start);
+		set_dma_count1(stream->dma, stream->period_size >> 1);
+		enable_dma_buffer1(stream->dma);
+		break;
+	case (DMA_D0 | DMA_D1):
+		spin_unlock(&stream->dma_lock);
+		printk(KERN_ERR "DMA %d missed interrupt.\n",stream->dma);
+		au1000_dma_stop(stream);
+		au1000_dma_start(stream);
+		spin_lock(&stream->dma_lock);
+		break;
+	case (~DMA_D0 & ~DMA_D1):
+		printk(KERN_ERR "DMA %d empty irq.\n",stream->dma);
+	}
+	spin_unlock(&stream->dma_lock);
+	snd_pcm_period_elapsed(substream);
+	return IRQ_HANDLED;
+}
+
+/*-------------------------- PCM Audio Streams -------------------------------*/
+
+static unsigned int rates[] = {8000, 11025, 16000, 22050};
+static snd_pcm_hw_constraint_list_t hw_constraints_rates = {
+	.count	=  sizeof(rates) / sizeof(rates[0]),
+	.list	= rates,
+	.mask	= 0,
+};
+
+static snd_pcm_hardware_t snd_au1000 =
+{
+	.info			= (SNDRV_PCM_INFO_INTERLEAVED | \
+				SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID),
+	.formats		= SNDRV_PCM_FMTBIT_S16_LE,
+	.rates			= (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |
+				SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050),
+	.rate_min		= 8000,
+	.rate_max		= 22050,
+	.channels_min		= 1,
+	.channels_max		= 2,
+	.buffer_bytes_max	= 128*1024,
+	.period_bytes_min	= 32,
+	.period_bytes_max	= 16*1024,
+	.periods_min		= 8,
+	.periods_max		= 255,
+	.fifo_size		= 16,
+};
+
+static int
+snd_au1000_playback_open(snd_pcm_substream_t * substream)
+{
+	au1000->stream[PLAYBACK]->substream = substream;
+	au1000->stream[PLAYBACK]->buffer = NULL;
+	substream->private_data = au1000->stream[PLAYBACK];
+	substream->runtime->hw = snd_au1000;
+	return (snd_pcm_hw_constraint_list(substream->runtime, 0,
+		SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates) < 0);
+}
+
+static int
+snd_au1000_capture_open(snd_pcm_substream_t * substream)
+{
+	au1000->stream[CAPTURE]->substream = substream;
+	au1000->stream[CAPTURE]->buffer = NULL;
+	substream->private_data = au1000->stream[CAPTURE];
+	substream->runtime->hw = snd_au1000;
+	return (snd_pcm_hw_constraint_list(substream->runtime, 0,
+		SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates) < 0);
+
+}
+
+static int
+snd_au1000_playback_close(snd_pcm_substream_t * substream)
+{
+	au1000->stream[PLAYBACK]->substream = NULL;
+	return 0;
+}
+
+static int
+snd_au1000_capture_close(snd_pcm_substream_t * substream)
+{
+	au1000->stream[CAPTURE]->substream = NULL;
+	return 0;
+}
+
+static int
+snd_au1000_hw_params(snd_pcm_substream_t * substream,
+					snd_pcm_hw_params_t * hw_params)
+{
+	return snd_pcm_lib_malloc_pages(substream,
+					params_buffer_bytes(hw_params));
+}
+
+static int
+snd_au1000_hw_free(snd_pcm_substream_t * substream)
+{
+	return snd_pcm_lib_free_pages(substream);
+}
+
+static int
+snd_au1000_playback_prepare(snd_pcm_substream_t * substream)
+{
+	snd_pcm_runtime_t *runtime = substream->runtime;
+
+	if (runtime->channels == 1 )
+		au1000_set_ac97_xmit_slots(AC97_SLOT_4);
+	else
+		au1000_set_ac97_xmit_slots(AC97_SLOT_3 | AC97_SLOT_4);
+	snd_ac97_set_rate(au1000->ac97, AC97_PCM_FRONT_DAC_RATE, runtime->rate);
+	return 0;
+}
+
+static int
+snd_au1000_capture_prepare(snd_pcm_substream_t * substream)
+{
+	snd_pcm_runtime_t *runtime = substream->runtime;
+
+	if (runtime->channels == 1 )
+		au1000_set_ac97_recv_slots(AC97_SLOT_4);
+	else
+		au1000_set_ac97_recv_slots(AC97_SLOT_3 | AC97_SLOT_4);
+	snd_ac97_set_rate(au1000->ac97, AC97_PCM_LR_ADC_RATE, runtime->rate);
+	return 0;
+}
+
+static int
+snd_au1000_trigger(snd_pcm_substream_t * substream, int cmd)
+{
+	audio_stream_t *stream = substream->private_data;
+	int err = 0;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+		au1000_dma_start(stream);
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+		au1000_dma_stop(stream);
+		break;
+	default:
+		err = -EINVAL;
+		break;
+	}
+	return err;
+}
+
+static snd_pcm_uframes_t
+snd_au1000_pointer(snd_pcm_substream_t * substream)
+{
+	audio_stream_t *stream = substream->private_data;
+	snd_pcm_runtime_t *runtime = substream->runtime;
+	unsigned long flags;
+	long location;
+
+	spin_lock_irqsave(&stream->dma_lock, flags);
+	location = get_dma_residue(stream->dma);
+	spin_unlock_irqrestore(&stream->dma_lock, flags);
+	location = stream->buffer->relative_end - location;
+	if (location == -1)
+		location = 0;
+	return bytes_to_frames(runtime,location);
+}
+
+static snd_pcm_ops_t snd_card_au1000_playback_ops = {
+	.open			= snd_au1000_playback_open,
+	.close			= snd_au1000_playback_close,
+	.ioctl			= snd_pcm_lib_ioctl,
+	.hw_params	        = snd_au1000_hw_params,
+	.hw_free	        = snd_au1000_hw_free,
+	.prepare		= snd_au1000_playback_prepare,
+	.trigger		= snd_au1000_trigger,
+	.pointer		= snd_au1000_pointer,
+};
+
+static snd_pcm_ops_t snd_card_au1000_capture_ops = {
+	.open			= snd_au1000_capture_open,
+	.close			= snd_au1000_capture_close,
+	.ioctl			= snd_pcm_lib_ioctl,
+	.hw_params	        = snd_au1000_hw_params,
+	.hw_free	        = snd_au1000_hw_free,
+	.prepare		= snd_au1000_capture_prepare,
+	.trigger		= snd_au1000_trigger,
+	.pointer		= snd_au1000_pointer,
+};
+
+static int __devinit
+snd_au1000_pcm_new(void)
+{
+	snd_pcm_t *pcm;
+	int err;
+	unsigned long flags;
+
+	if ((err = snd_pcm_new(au1000->card, "AU1000 AC97 PCM", 0, 1, 1, &pcm)) < 0)
+		return err;
+
+	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
+		snd_dma_continuous_data(GFP_KERNEL), 128*1024, 128*1024);
+
+	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
+		&snd_card_au1000_playback_ops);
+	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
+		&snd_card_au1000_capture_ops);
+
+	pcm->private_data = au1000;
+	pcm->info_flags = 0;
+	strcpy(pcm->name, "Au1000 AC97 PCM");
+
+	flags = claim_dma_lock();
+	if ((au1000->stream[PLAYBACK]->dma = request_au1000_dma(DMA_ID_AC97C_TX,
+			"AC97 TX", au1000_dma_interrupt, SA_INTERRUPT,
+			au1000->stream[PLAYBACK])) < 0) {
+		release_dma_lock(flags);
+		return -EBUSY;
+	}
+	if ((au1000->stream[CAPTURE]->dma = request_au1000_dma(DMA_ID_AC97C_RX,
+			"AC97 RX", au1000_dma_interrupt, SA_INTERRUPT,
+			au1000->stream[CAPTURE])) < 0){
+		release_dma_lock(flags);
+		return -EBUSY;
+	}
+	/* enable DMA coherency in read/write DMA channels */
+	set_dma_mode(au1000->stream[PLAYBACK]->dma,
+		     get_dma_mode(au1000->stream[PLAYBACK]->dma) & ~DMA_NC);
+	set_dma_mode(au1000->stream[CAPTURE]->dma,
+		     get_dma_mode(au1000->stream[CAPTURE]->dma) & ~DMA_NC);
+	release_dma_lock(flags);
+	spin_lock_init(&au1000->stream[PLAYBACK]->dma_lock);
+	spin_lock_init(&au1000->stream[CAPTURE]->dma_lock);
+	au1000->pcm = pcm;
+	return 0;
+}
+
+
+/*-------------------------- AC97 CODEC Control ------------------------------*/
+
+static unsigned short
+snd_au1000_ac97_read(ac97_t *ac97, unsigned short reg)
+{
+	u32 volatile cmd;
+	u16 volatile data;
+	int             i;
+	spin_lock(au1000->ac97_lock);
+/* would rather use the interupt than this polling but it works and I can't
+get the interupt driven case to work efficiently */
+	for (i = 0; i < 0x5000; i++)
+		if (!(au1000->ac97_ioport->status & AC97C_CP))
+			break;
+	if (i == 0x5000)
+		printk(KERN_ERR "au1000 AC97: AC97 command read timeout\n");
+
+	cmd = (u32) reg & AC97C_INDEX_MASK;
+	cmd |= AC97C_READ;
+	au1000->ac97_ioport->cmd = cmd;
+
+	/* now wait for the data */
+	for (i = 0; i < 0x5000; i++)
+		if (!(au1000->ac97_ioport->status & AC97C_CP))
+			break;
+	if (i == 0x5000) {
+		printk(KERN_ERR "au1000 AC97: AC97 command read timeout\n");
+		return 0;
+	}
+
+	data = au1000->ac97_ioport->cmd & 0xffff;
+	spin_unlock(au1000->ac97_lock);
+
+	return data;
+
+}
+
+
+static void
+snd_au1000_ac97_write(ac97_t *ac97, unsigned short reg, unsigned short val)
+{
+	u32 cmd;
+	int i;
+	spin_lock(au1000->ac97_lock);
+/* would rather use the interupt than this polling but it works and I can't
+get the interupt driven case to work efficiently */
+	for (i = 0; i < 0x5000; i++)
+		if (!(au1000->ac97_ioport->status & AC97C_CP))
+			break;
+	if (i == 0x5000)
+		printk(KERN_ERR "au1000 AC97: AC97 command write timeout\n");
+
+	cmd = (u32) reg & AC97C_INDEX_MASK;
+	cmd &= ~AC97C_READ;
+	cmd |= ((u32) val << AC97C_WD_BIT);
+	au1000->ac97_ioport->cmd = cmd;
+	spin_unlock(au1000->ac97_lock);
+}
+static void
+snd_au1000_ac97_free(ac97_t *ac97)
+{
+	au1000->ac97 = NULL;
+}
+
+static int __devinit
+snd_au1000_ac97_new(void)
+{
+	int err;
+
+#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,8)
+	ac97_bus_t *pbus;
+	ac97_template_t ac97;
+ 	static ac97_bus_ops_t ops = {
+		.write = snd_au1000_ac97_write,
+		.read = snd_au1000_ac97_read,
+	};
+#else
+	ac97_bus_t bus, *pbus;
+	ac97_t ac97;
+#endif
+
+	if ((au1000->ac97_res_port = request_region(AC97C_CONFIG,
+	       		sizeof(au1000_ac97_reg_t), "Au1x00 AC97")) == NULL) {
+		snd_printk(KERN_ERR "ALSA AC97: can't grap AC97 port\n");
+		return -EBUSY;
+	}
+	au1000->ac97_ioport = (au1000_ac97_reg_t *) au1000->ac97_res_port->start;
+
+	spin_lock_init(&au1000->ac97_lock);
+
+	spin_lock(&au1000->ac97_lock);
+
+	/* configure pins for AC'97
+	TODO: move to board_setup.c */
+	au_writel(au_readl(SYS_PINFUNC) & ~0x02, SYS_PINFUNC);
+
+	/* Initialise Au1000's AC'97 Control Block */
+	au1000->ac97_ioport->cntrl = AC97C_RS | AC97C_CE;
+	udelay(10);
+	au1000->ac97_ioport->cntrl = AC97C_CE;
+	udelay(10);
+
+	/* Initialise External CODEC -- cold reset */
+	au1000->ac97_ioport->config = AC97C_RESET;
+	udelay(10);
+	au1000->ac97_ioport->config = 0x0;
+	mdelay(5);
+
+	spin_unlock(&au1000->ac97_lock);
+
+	/* Initialise AC97 middle-layer */
+#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,8)
+	if ((err = snd_ac97_bus(au1000->card, 0, &ops, au1000, &pbus)) < 0)
+ 		return err;
+#else
+	memset(&bus, 0, sizeof(bus));
+	bus.write = snd_au1000_ac97_write;
+	bus.read = snd_au1000_ac97_read;
+	if ((err = snd_ac97_bus(au1000->card, &bus, &pbus)) < 0)
+		return err;
+#endif
+	memset(&ac97, 0, sizeof(ac97));
+	ac97.private_data = au1000;
+	ac97.private_free = snd_au1000_ac97_free;
+	if ((err = snd_ac97_mixer(pbus, &ac97, &au1000->ac97)) < 0)
+		return err;
+	return 0;
+
+}
+
+/*------------------------------ Setup / Destroy ----------------------------*/
+
+void
+snd_au1000_free(snd_card_t *card)
+{
+
+	if (au1000->ac97_res_port) {
+		/* put internal AC97 block into reset */
+		au1000->ac97_ioport->cntrl = AC97C_RS;
+		au1000->ac97_ioport = NULL;
+		release_resource(au1000->ac97_res_port);
+		kfree_nocheck(au1000->ac97_res_port);
+	}
+
+	if (au1000->stream[PLAYBACK]->dma >= 0)
+		free_au1000_dma(au1000->stream[PLAYBACK]->dma);
+
+	if (au1000->stream[CAPTURE]->dma >= 0)
+		free_au1000_dma(au1000->stream[CAPTURE]->dma);
+
+	kfree(au1000->stream[PLAYBACK]);
+	au1000->stream[PLAYBACK] = NULL;
+	kfree(au1000->stream[CAPTURE]);
+	au1000->stream[CAPTURE] = NULL;
+	kfree(au1000);
+	au1000 = NULL;
+
+}
+
+static int __init
+au1000_init(void)
+{
+	int err;
+
+	au1000 = kmalloc(sizeof(au1000_t), GFP_KERNEL);
+	if (au1000 == NULL)
+		return -ENOMEM;
+	au1000->stream[PLAYBACK] = kmalloc(sizeof(audio_stream_t), GFP_KERNEL);
+	if (au1000->stream[PLAYBACK] == NULL)
+		return -ENOMEM;
+	au1000->stream[CAPTURE] = kmalloc(sizeof(audio_stream_t), GFP_KERNEL);
+	if (au1000->stream[CAPTURE] == NULL)
+		return -ENOMEM;
+	/* so that snd_au1000_free will work as intended */
+	au1000->stream[PLAYBACK]->dma = -1;
+	au1000->stream[CAPTURE]->dma = -1;
+ 	au1000->ac97_res_port = NULL;
+
+	au1000->card = snd_card_new(-1, "AC97", THIS_MODULE, sizeof(au1000_t));
+	if (au1000->card == NULL) {
+		snd_au1000_free(au1000->card);
+		return -ENOMEM;
+	}
+
+	au1000->card->private_data = (au1000_t *)au1000;
+	au1000->card->private_free = snd_au1000_free;
+
+	if ((err = snd_au1000_ac97_new()) < 0 ) {
+		snd_card_free(au1000->card);
+		return err;
+	}
+
+	if ((err = snd_au1000_pcm_new()) < 0) {
+		snd_card_free(au1000->card);
+		return err;
+	}
+
+	strcpy(au1000->card->driver, "AMD-Au1000-AC97");
+	strcpy(au1000->card->shortname, "Au1000-AC97");
+	sprintf(au1000->card->longname, "AMD Au1000--AC97 ALSA Driver");
+
+	if ((err = snd_card_register(au1000->card)) < 0) {
+		snd_card_free(au1000->card);
+		return err;
+	}
+
+	printk( KERN_INFO "ALSA AC97: Driver Initialized\n" );
+	return 0;
+}
+
+static void __exit au1000_exit(void)
+{
+	snd_card_free(au1000->card);
+}
+
+module_init(au1000_init);
+module_exit(au1000_exit);
+