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, 3832 insertions, 0 deletions

diff --git a/sound/oss/maestro.c b/sound/oss/maestro.c
new file mode 100644
index 000000000000..52d2db4bc312
--- /dev/null
+++ b/sound/oss/maestro.c
@@ -0,0 +1,3832 @@
+/*****************************************************************************
+ *
+ *      ESS Maestro/Maestro-2/Maestro-2E driver for Linux 2.[23].x
+ *
+ *      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 program is distributed in the hope that it will be useful,
+ *      but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *      GNU General Public License for more details.
+ *
+ *      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.
+ *
+ *	(c) Copyright 1999	 Alan Cox <alan.cox@linux.org>
+ *
+ *	Based heavily on SonicVibes.c:
+ *      Copyright (C) 1998-1999  Thomas Sailer (sailer@ife.ee.ethz.ch)
+ *
+ *	Heavily modified by Zach Brown <zab@zabbo.net> based on lunch
+ *	with ESS engineers.  Many thanks to Howard Kim for providing 
+ *	contacts and hardware.  Honorable mention goes to Eric 
+ *	Brombaugh for all sorts of things.  Best regards to the 
+ *	proprietors of Hack Central for fine lodging.
+ *
+ *  Supported devices:
+ *  /dev/dsp0-3    standard /dev/dsp device, (mostly) OSS compatible
+ *  /dev/mixer  standard /dev/mixer device, (mostly) OSS compatible
+ *
+ *  Hardware Description
+ *
+ *	A working Maestro setup contains the Maestro chip wired to a 
+ *	codec or 2.  In the Maestro we have the APUs, the ASSP, and the
+ *	Wavecache.  The APUs can be though of as virtual audio routing
+ *	channels.  They can take data from a number of sources and perform
+ *	basic encodings of the data.  The wavecache is a storehouse for
+ *	PCM data.  Typically it deals with PCI and interracts with the
+ *	APUs.  The ASSP is a wacky DSP like device that ESS is loth
+ *	to release docs on.  Thankfully it isn't required on the Maestro
+ *	until you start doing insane things like FM emulation and surround
+ *	encoding.  The codecs are almost always AC-97 compliant codecs, 
+ *	but it appears that early Maestros may have had PT101 (an ESS
+ *	part?) wired to them.  The only real difference in the Maestro
+ *	families is external goop like docking capability, memory for
+ *	the ASSP, and initialization differences.
+ *
+ *  Driver Operation
+ *
+ *	We only drive the APU/Wavecache as typical DACs and drive the
+ *	mixers in the codecs.  There are 64 APUs.  We assign 6 to each
+ *	/dev/dsp? device.  2 channels for output, and 4 channels for
+ *	input.
+ *
+ *	Each APU can do a number of things, but we only really use
+ *	3 basic functions.  For playback we use them to convert PCM
+ *	data fetched over PCI by the wavecahche into analog data that
+ *	is handed to the codec.  One APU for mono, and a pair for stereo.
+ *	When in stereo, the combination of smarts in the APU and Wavecache
+ *	decide which wavecache gets the left or right channel.
+ *
+ *	For record we still use the old overly mono system.  For each in
+ *	coming channel the data comes in from the codec, through a 'input'
+ *	APU, through another rate converter APU, and then into memory via
+ *	the wavecache and PCI.  If its stereo, we mash it back into LRLR in
+ *	software.  The pass between the 2 APUs is supposedly what requires us
+ *	to have a 512 byte buffer sitting around in wavecache/memory.
+ *
+ *	The wavecache makes our life even more fun.  First off, it can
+ *	only address the first 28 bits of PCI address space, making it
+ *	useless on quite a few architectures.  Secondly, its insane.
+ *	It claims to fetch from 4 regions of PCI space, each 4 meg in length.
+ *	But that doesn't really work.  You can only use 1 region.  So all our
+ *	allocations have to be in 4meg of each other.  Booo.  Hiss.
+ *	So we have a module parameter, dsps_order, that is the order of
+ *	the number of dsps to provide.  All their buffer space is allocated
+ *	on open time.  The sonicvibes OSS routines we inherited really want
+ *	power of 2 buffers, so we have all those next to each other, then
+ *	512 byte regions for the recording wavecaches.  This ends up
+ *	wasting quite a bit of memory.  The only fixes I can see would be 
+ *	getting a kernel allocator that could work in zones, or figuring out
+ *	just how to coerce the WP into doing what we want.
+ *
+ *	The indirection of the various registers means we have to spinlock
+ *	nearly all register accesses.  We have the main register indirection
+ *	like the wave cache, maestro registers, etc.  Then we have beasts
+ *	like the APU interface that is indirect registers gotten at through
+ *	the main maestro indirection.  Ouch.  We spinlock around the actual
+ *	ports on a per card basis.  This means spinlock activity at each IO
+ *	operation, but the only IO operation clusters are in non critical 
+ *	paths and it makes the code far easier to follow.  Interrupts are
+ *	blocked while holding the locks because the int handler has to
+ *	get at some of them :(.  The mixer interface doesn't, however.
+ *	We also have an OSS state lock that is thrown around in a few
+ *	places.
+ *
+ *	This driver has brute force APM suspend support.  We catch suspend
+ *	notifications and stop all work being done on the chip.  Any people
+ *	that try between this shutdown and the real suspend operation will
+ *	be put to sleep.  When we resume we restore our software state on
+ *	the chip and wake up the people that were using it.  The code thats
+ *	being used now is quite dirty and assumes we're on a uni-processor
+ *	machine.  Much of it will need to be cleaned up for SMP ACPI or 
+ *	similar.
+ *
+ *	We also pay attention to PCI power management now.  The driver
+ *	will power down units of the chip that it knows aren't needed.
+ *	The WaveProcessor and company are only powered on when people
+ *	have /dev/dsp*s open.  On removal the driver will
+ *	power down the maestro entirely.  There could still be
+ *	trouble with BIOSen that magically change power states 
+ *	themselves, but we'll see.  
+ *	
+ * History
+ *  v0.15 - May 21 2001 - Marcus Meissner <mm@caldera.de>
+ *      Ported to Linux 2.4 PCI API. Some clean ups, global devs list
+ *      removed (now using pci device driver data).
+ *      PM needs to be polished still. Bumped version.
+ *  (still kind of v0.14) May 13 2001 - Ben Pfaff <pfaffben@msu.edu>
+ *      Add support for 978 docking and basic hardware volume control
+ *  (still kind of v0.14) Nov 23 - Alan Cox <alan@redhat.com>
+ *	Add clocking= for people with seriously warped hardware
+ *  (still v0.14) Nov 10 2000 - Bartlomiej Zolnierkiewicz <bkz@linux-ide.org>
+ *	add __init to maestro_ac97_init() and maestro_install()
+ *  (still based on v0.14) Mar 29 2000 - Zach Brown <zab@redhat.com>
+ *	move to 2.3 power management interface, which
+ *		required hacking some suspend/resume/check paths 
+ *	make static compilation work
+ *  v0.14 - Jan 28 2000 - Zach Brown <zab@redhat.com>
+ *	add PCI power management through ACPI regs.
+ *	we now shut down on machine reboot/halt
+ *	leave scary PCI config items alone (isa stuff, mostly)
+ *	enable 1921s, it seems only mine was broke.
+ *	fix swapped left/right pcm dac.  har har.
+ *	up bob freq, increase buffers, fix pointers at underflow
+ *	silly compilation problems
+ *  v0.13 - Nov 18 1999 - Zach Brown <zab@redhat.com>
+ *	fix nec Versas?  man would that be cool.
+ *  v0.12 - Nov 12 1999 - Zach Brown <zab@redhat.com>
+ *	brown bag volume max fix..
+ *  v0.11 - Nov 11 1999 - Zach Brown <zab@redhat.com>
+ *	use proper stereo apu decoding, mmap/write should work.
+ *	make volume sliders more useful, tweak rate calculation.
+ *	fix lame 8bit format reporting bug.  duh. apm apu saving buglet also
+ *	fix maestro 1 clock freq "bug", remove pt101 support
+ *  v0.10 - Oct 28 1999 - Zach Brown <zab@redhat.com>
+ *	aha, so, sometimes the WP writes a status word to offset 0
+ *	  from one of the PCMBARs.  rearrange allocation accordingly..
+ *	  cheers again to Eric for being a good hacker in investigating this.
+ *	Jeroen Hoogervorst submits 7500 fix out of nowhere.  yay.  :)
+ *  v0.09 - Oct 23 1999 - Zach Brown <zab@redhat.com>
+ *	added APM support.
+ *	re-order something such that some 2Es now work.  Magic!
+ *	new codec reset routine.  made some codecs come to life.
+ *	fix clear_advance, sync some control with ESS.
+ *	now write to all base regs to be paranoid.
+ *  v0.08 - Oct 20 1999 - Zach Brown <zab@redhat.com>
+ *	Fix initial buflen bug.  I am so smart.  also smp compiling..
+ *	I owe Eric yet another beer: fixed recmask, igain, 
+ *	  muting, and adc sync consistency.  Go Team.
+ *  v0.07 - Oct 4 1999 - Zach Brown <zab@redhat.com>
+ *	tweak adc/dac, formating, and stuff to allow full duplex
+ *	allocate dsps memory at open() so we can fit in the wavecache window
+ *	fix wavecache braindamage.  again.  no more scribbling?
+ *	fix ess 1921 codec bug on some laptops.
+ *	fix dumb pci scanning bug
+ *	started 2.3 cleanup, redid spinlocks, little cleanups
+ *  v0.06 - Sep 20 1999 - Zach Brown <zab@redhat.com>
+ *	fix wavecache thinkos.  limit to 1 /dev/dsp.
+ *	eric is wearing his thinking toque this week.
+ *		spotted apu mode bugs and gain ramping problem
+ *	don't touch weird mixer regs, make recmask optional
+ *	fixed igain inversion, defaults for mixers, clean up rec_start
+ *	make mono recording work.
+ *	report subsystem stuff, please send reports.
+ *	littles: parallel out, amp now
+ *  v0.05 - Sep 17 1999 - Zach Brown <zab@redhat.com>
+ *	merged and fixed up Eric's initial recording code
+ *	munged format handling to catch misuse, needs rewrite.
+ *	revert ring bus init, fixup shared int, add pci busmaster setting
+ *	fix mixer oss interface, fix mic mute and recmask
+ *	mask off unsupported mixers, reset with all 1s, modularize defaults
+ *	make sure bob is running while we need it
+ *	got rid of device limit, initial minimal apm hooks
+ *	pull out dead code/includes, only allow multimedia/audio maestros
+ *  v0.04 - Sep 01 1999 - Zach Brown <zab@redhat.com>
+ *	copied memory leak fix from sonicvibes driver
+ *	different ac97 reset, play with 2.0 ac97, simplify ring bus setup
+ *	bob freq code, region sanity, jitter sync fix; all from Eric 
+ *
+ * TODO
+ *	fix bob frequency
+ *	endianness
+ *	do smart things with ac97 2.0 bits.
+ *	dual codecs
+ *	leave 54->61 open
+ *
+ *	it also would be fun to have a mode that would not use pci dma at all
+ *	but would copy into the wavecache on board memory and use that 
+ *	on architectures that don't like the maestro's pci dma ickiness.
+ */
+
+/*****************************************************************************/
+
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/smp_lock.h>
+#include <linux/string.h>
+#include <linux/ctype.h>
+#include <linux/ioport.h>
+#include <linux/delay.h>
+#include <linux/sound.h>
+#include <linux/slab.h>
+#include <linux/soundcard.h>
+#include <linux/pci.h>
+#include <linux/spinlock.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/poll.h>
+#include <linux/reboot.h>
+#include <linux/bitops.h>
+#include <linux/wait.h>
+
+#include <asm/current.h>
+#include <asm/dma.h>
+#include <asm/io.h>
+#include <asm/page.h>
+#include <asm/uaccess.h>
+
+#include <linux/pm.h>
+static int maestro_pm_callback(struct pm_dev *dev, pm_request_t rqst, void *d);
+
+#include "maestro.h"
+
+static struct pci_driver maestro_pci_driver;
+
+/* --------------------------------------------------------------------- */
+
+#define M_DEBUG 1
+
+#ifdef M_DEBUG
+static int debug;
+#define M_printk(args...) {if (debug) printk(args);}
+#else
+#define M_printk(x)
+#endif
+
+/* we try to setup 2^(dsps_order) /dev/dsp devices */
+static int dsps_order;
+/* whether or not we mess around with power management */
+static int use_pm=2; /* set to 1 for force */
+/* clocking for broken hardware - a few laptops seem to use a 50Khz clock
+	ie insmod with clocking=50000 or so */
+	
+static int clocking=48000;
+
+MODULE_AUTHOR("Zach Brown <zab@zabbo.net>, Alan Cox <alan@redhat.com>");
+MODULE_DESCRIPTION("ESS Maestro Driver");
+MODULE_LICENSE("GPL");
+
+#ifdef M_DEBUG
+module_param(debug, bool, 0644);
+#endif
+module_param(dsps_order, int, 0);
+module_param(use_pm, int, 0);
+module_param(clocking, int, 0);
+
+/* --------------------------------------------------------------------- */
+#define DRIVER_VERSION "0.15"
+
+#ifndef PCI_VENDOR_ESS
+#define PCI_VENDOR_ESS			0x125D
+#define PCI_DEVICE_ID_ESS_ESS1968	0x1968		/* Maestro 2	*/
+#define PCI_DEVICE_ID_ESS_ESS1978      	0x1978		/* Maestro 2E	*/
+
+#define PCI_VENDOR_ESS_OLD		0x1285		/* Platform Tech, 
+						the people the maestro 
+						was bought from */
+#define PCI_DEVICE_ID_ESS_ESS0100	0x0100		/* maestro 1 */
+#endif /* PCI_VENDOR_ESS */
+
+#define ESS_CHAN_HARD		0x100
+
+/* NEC Versas ? */
+#define NEC_VERSA_SUBID1	0x80581033
+#define NEC_VERSA_SUBID2	0x803c1033
+
+
+/* changed so that I could actually find all the
+	references and fix them up.  it's a little more readable now. */
+#define ESS_FMT_STEREO	0x01
+#define ESS_FMT_16BIT	0x02
+#define ESS_FMT_MASK	0x03
+#define ESS_DAC_SHIFT	0   
+#define ESS_ADC_SHIFT	4
+
+#define ESS_STATE_MAGIC		0x125D1968
+#define ESS_CARD_MAGIC		0x19283746
+
+#define DAC_RUNNING		1
+#define ADC_RUNNING		2
+
+#define MAX_DSP_ORDER	2
+#define MAX_DSPS	(1<<MAX_DSP_ORDER)
+#define NR_DSPS		(1<<dsps_order)
+#define NR_IDRS		32
+
+#define NR_APUS		64
+#define NR_APU_REGS	16
+
+/* acpi states */
+enum {
+	ACPI_D0=0,
+	ACPI_D1,
+	ACPI_D2,
+	ACPI_D3
+};
+
+/* bits in the acpi masks */
+#define ACPI_12MHZ	( 1 << 15)
+#define ACPI_24MHZ	( 1 << 14)
+#define ACPI_978	( 1 << 13)
+#define ACPI_SPDIF	( 1 << 12)
+#define ACPI_GLUE	( 1 << 11)
+#define ACPI__10	( 1 << 10) /* reserved */
+#define ACPI_PCIINT	( 1 << 9)
+#define ACPI_HV		( 1 << 8) /* hardware volume */
+#define ACPI_GPIO	( 1 << 7)
+#define ACPI_ASSP	( 1 << 6)
+#define ACPI_SB		( 1 << 5) /* sb emul */
+#define ACPI_FM		( 1 << 4) /* fm emul */
+#define ACPI_RB		( 1 << 3) /* ringbus / aclink */
+#define ACPI_MIDI	( 1 << 2) 
+#define ACPI_GP		( 1 << 1) /* game port */
+#define ACPI_WP		( 1 << 0) /* wave processor */
+
+#define ACPI_ALL	(0xffff)
+#define ACPI_SLEEP	(~(ACPI_SPDIF|ACPI_ASSP|ACPI_SB|ACPI_FM| \
+			ACPI_MIDI|ACPI_GP|ACPI_WP))
+#define ACPI_NONE	(ACPI__10)
+
+/* these masks indicate which units we care about at
+	which states */
+static u16 acpi_state_mask[] = {
+	[ACPI_D0] = ACPI_ALL,
+	[ACPI_D1] = ACPI_SLEEP,
+	[ACPI_D2] = ACPI_SLEEP,
+	[ACPI_D3] = ACPI_NONE
+};
+
+static char version[] __devinitdata =
+KERN_INFO "maestro: version " DRIVER_VERSION " time " __TIME__ " " __DATE__ "\n";
+
+
+
+static const unsigned sample_size[] = { 1, 2, 2, 4 };
+static const unsigned sample_shift[] = { 0, 1, 1, 2 };
+
+enum card_types_t {
+	TYPE_MAESTRO,
+	TYPE_MAESTRO2,
+	TYPE_MAESTRO2E
+};
+
+static const char *card_names[]={
+	[TYPE_MAESTRO] = "ESS Maestro",
+	[TYPE_MAESTRO2] = "ESS Maestro 2",
+	[TYPE_MAESTRO2E] = "ESS Maestro 2E"
+};
+
+static int clock_freq[]={
+	[TYPE_MAESTRO] = (49152000L / 1024L),
+	[TYPE_MAESTRO2] = (50000000L / 1024L),
+	[TYPE_MAESTRO2E] = (50000000L / 1024L)
+};
+
+static int maestro_notifier(struct notifier_block *nb, unsigned long event, void *buf);
+
+static struct notifier_block maestro_nb = {maestro_notifier, NULL, 0};
+
+/* --------------------------------------------------------------------- */
+
+struct ess_state {
+	unsigned int magic;
+	/* FIXME: we probably want submixers in here, but only one record pair */
+	u8 apu[6];		/* l/r output, l/r intput converters, l/r input apus */
+	u8 apu_mode[6];		/* Running mode for this APU */
+	u8 apu_pan[6];		/* Panning setup for this APU */
+	u32 apu_base[6];	/* base address for this apu */
+	struct ess_card *card;	/* Card info */
+	/* wave stuff */
+	unsigned int rateadc, ratedac;
+	unsigned char fmt, enable;
+
+	int index;
+
+	/* this locks around the oss state in the driver */
+	spinlock_t lock;
+	/* only let 1 be opening at a time */
+	struct semaphore open_sem;
+	wait_queue_head_t open_wait;
+	mode_t open_mode;
+
+	/* soundcore stuff */
+	int dev_audio;
+
+	struct dmabuf {
+		void *rawbuf;
+		unsigned buforder;
+		unsigned numfrag;
+		unsigned fragshift;
+		/* XXX zab - swptr only in here so that it can be referenced by
+			clear_advance, as far as I can tell :( */
+		unsigned hwptr, swptr;
+		unsigned total_bytes;
+		int count;
+		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;	/* our oss buffers are ready to go */
+		unsigned endcleared:1;
+		unsigned ossfragshift;
+		int ossmaxfrags;
+		unsigned subdivision;
+		u16 base;		/* Offset for ptr */
+	} dma_dac, dma_adc;
+
+	/* pointer to each dsp?s piece of the apu->src buffer page */
+	void *mixbuf;
+
+};
+	
+struct ess_card {
+	unsigned int magic;
+
+	/* We keep maestro cards in a linked list */
+	struct ess_card *next;
+
+	int dev_mixer;
+
+	int card_type;
+
+	/* as most of this is static,
+		perhaps it should be a pointer to a global struct */
+	struct mixer_goo {
+		int modcnt;
+		int supported_mixers;
+		int stereo_mixers;
+		int record_sources;
+		/* the caller must guarantee arg sanity before calling these */
+/*		int (*read_mixer)(struct ess_card *card, int index);*/
+		void (*write_mixer)(struct ess_card *card,int mixer, unsigned int left,unsigned int right);
+		int (*recmask_io)(struct ess_card *card,int rw,int mask);
+		unsigned int mixer_state[SOUND_MIXER_NRDEVICES];
+	} mix;
+	
+	int power_regs;
+		
+	int in_suspend;
+	wait_queue_head_t suspend_queue;
+
+	struct ess_state channels[MAX_DSPS];
+	u16 maestro_map[NR_IDRS];	/* Register map */
+	/* we have to store this junk so that we can come back from a
+		suspend */
+	u16 apu_map[NR_APUS][NR_APU_REGS];	/* contents of apu regs */
+
+	/* this locks around the physical registers on the card */
+	spinlock_t lock;
+
+	/* memory for this card.. wavecache limited :(*/
+	void *dmapages;
+	int dmaorder;
+
+	/* hardware resources */
+	struct pci_dev *pcidev;
+	u32 iobase;
+	u32 irq;
+
+	int bob_freq;
+	char dsps_open;
+
+	int dock_mute_vol;
+};
+
+static void set_mixer(struct ess_card *card,unsigned int mixer, unsigned int val );
+
+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 check_suspend(struct ess_card *card);
+
+/* --------------------------------------------------------------------- */
+
+
+/*
+ *	ESS Maestro AC97 codec programming interface.
+ */
+	 
+static void maestro_ac97_set(struct ess_card *card, u8 cmd, u16 val)
+{
+	int io = card->iobase;
+	int i;
+	/*
+	 *	Wait for the codec bus to be free 
+	 */
+
+	check_suspend(card);
+	 
+	for(i=0;i<10000;i++)
+	{
+		if(!(inb(io+ESS_AC97_INDEX)&1)) 
+			break;
+	}
+	/*
+	 *	Write the bus
+	 */ 
+	outw(val, io+ESS_AC97_DATA);
+	mdelay(1);
+	outb(cmd, io+ESS_AC97_INDEX);
+	mdelay(1);
+}
+
+static u16 maestro_ac97_get(struct ess_card *card, u8 cmd)
+{
+	int io = card->iobase;
+	int sanity=10000;
+	u16 data;
+	int i;
+	
+	check_suspend(card);
+	/*
+	 *	Wait for the codec bus to be free 
+	 */
+	 
+	for(i=0;i<10000;i++)
+	{
+		if(!(inb(io+ESS_AC97_INDEX)&1))
+			break;
+	}
+
+	outb(cmd|0x80, io+ESS_AC97_INDEX);
+	mdelay(1);
+	
+	while(inb(io+ESS_AC97_INDEX)&1)
+	{
+		sanity--;
+		if(!sanity)
+		{
+			printk(KERN_ERR "maestro: ac97 codec timeout reading 0x%x.\n",cmd);
+			return 0;
+		}
+	}
+	data=inw(io+ESS_AC97_DATA);
+	mdelay(1);
+	return data;
+}
+
+/* OSS interface to the ac97s.. */
+
+#define AC97_STEREO_MASK (SOUND_MASK_VOLUME|\
+	SOUND_MASK_PCM|SOUND_MASK_LINE|SOUND_MASK_CD|\
+	SOUND_MASK_VIDEO|SOUND_MASK_LINE1|SOUND_MASK_IGAIN)
+
+#define AC97_SUPPORTED_MASK (AC97_STEREO_MASK | \
+	SOUND_MASK_BASS|SOUND_MASK_TREBLE|SOUND_MASK_MIC|\
+	SOUND_MASK_SPEAKER)
+
+#define AC97_RECORD_MASK (SOUND_MASK_MIC|\
+	SOUND_MASK_CD| SOUND_MASK_VIDEO| SOUND_MASK_LINE1| SOUND_MASK_LINE|\
+	SOUND_MASK_PHONEIN)
+
+#define supported_mixer(CARD,FOO) ( CARD->mix.supported_mixers & (1<<FOO) )
+
+/* this table has default mixer values for all OSS mixers.
+	be sure to fill it in if you add oss mixers
+	to anyone's supported mixer defines */
+
+static unsigned int mixer_defaults[SOUND_MIXER_NRDEVICES] = {
+	[SOUND_MIXER_VOLUME] =          0x3232,
+	[SOUND_MIXER_BASS] =            0x3232,
+	[SOUND_MIXER_TREBLE] =          0x3232,
+	[SOUND_MIXER_SPEAKER] =         0x3232,
+	[SOUND_MIXER_MIC] =     0x8000, /* annoying */
+	[SOUND_MIXER_LINE] =    0x3232,
+	[SOUND_MIXER_CD] =      0x3232,
+	[SOUND_MIXER_VIDEO] =   0x3232,
+	[SOUND_MIXER_LINE1] =   0x3232,
+	[SOUND_MIXER_PCM] =             0x3232,
+	[SOUND_MIXER_IGAIN] =           0x3232
+};
+	
+static struct ac97_mixer_hw {
+	unsigned char offset;
+	int scale;
+} ac97_hw[SOUND_MIXER_NRDEVICES]= {
+	[SOUND_MIXER_VOLUME]	=	{0x02,63},
+	[SOUND_MIXER_BASS]	=	{0x08,15},
+	[SOUND_MIXER_TREBLE]	=	{0x08,15},
+	[SOUND_MIXER_SPEAKER]	=	{0x0a,15},
+	[SOUND_MIXER_MIC]	=	{0x0e,31},
+	[SOUND_MIXER_LINE]	=	{0x10,31},
+	[SOUND_MIXER_CD]	=	{0x12,31},
+	[SOUND_MIXER_VIDEO]	=	{0x14,31},
+	[SOUND_MIXER_LINE1]	=	{0x16,31},
+	[SOUND_MIXER_PCM]	=	{0x18,31},
+	[SOUND_MIXER_IGAIN]	=	{0x1c,15}
+};
+
+#if 0 /* *shrug* removed simply because we never used it.
+		feel free to implement again if needed */
+
+/* reads the given OSS mixer from the ac97
+	the caller must have insured that the ac97 knows
+	about that given mixer, and should be holding a
+	spinlock for the card */
+static int ac97_read_mixer(struct ess_card *card, int mixer) 
+{
+	u16 val;
+	int ret=0;
+	struct ac97_mixer_hw *mh = &ac97_hw[mixer];
+
+	val = maestro_ac97_get(card, mh->offset);
+
+	if(AC97_STEREO_MASK & (1<<mixer)) {
+		/* nice stereo mixers .. */
+		int left,right;
+
+		left = (val >> 8)  & 0x7f;
+		right = val  & 0x7f;
+
+		if (mixer == SOUND_MIXER_IGAIN) {
+			right = (right * 100) / mh->scale;
+			left = (left * 100) / mh->scale;
+		} else {
+			right = 100 - ((right * 100) / mh->scale);
+			left = 100 - ((left * 100) / mh->scale);
+		}
+
+		ret = left | (right << 8);
+	} else if (mixer == SOUND_MIXER_SPEAKER) {
+		ret = 100 - ((((val & 0x1e)>>1) * 100) / mh->scale);
+	} else if (mixer == SOUND_MIXER_MIC) {
+		ret = 100 - (((val & 0x1f) * 100) / mh->scale);
+	/*  the low bit is optional in the tone sliders and masking
+		it lets is avoid the 0xf 'bypass'.. */
+	} else if (mixer == SOUND_MIXER_BASS) {
+		ret = 100 - ((((val >> 8) & 0xe) * 100) / mh->scale);
+	} else if (mixer == SOUND_MIXER_TREBLE) {
+		ret = 100 - (((val & 0xe) * 100) / mh->scale);
+	}
+
+	M_printk("read mixer %d (0x%x) %x -> %x\n",mixer,mh->offset,val,ret);
+
+	return ret;
+}
+#endif
+
+/* write the OSS encoded volume to the given OSS encoded mixer,
+	again caller's job to make sure all is well in arg land,
+	call with spinlock held */
+	
+/* linear scale -> log */
+static unsigned char lin2log[101] = 
+{
+0, 0 , 15 , 23 , 30 , 34 , 38 , 42 , 45 , 47 ,
+50 , 52 , 53 , 55 , 57 , 58 , 60 , 61 , 62 ,
+63 , 65 , 66 , 67 , 68 , 69 , 69 , 70 , 71 ,
+72 , 73 , 73 , 74 , 75 , 75 , 76 , 77 , 77 ,
+78 , 78 , 79 , 80 , 80 , 81 , 81 , 82 , 82 ,
+83 , 83 , 84 , 84 , 84 , 85 , 85 , 86 , 86 ,
+87 , 87 , 87 , 88 , 88 , 88 , 89 , 89 , 89 ,
+90 , 90 , 90 , 91 , 91 , 91 , 92 , 92 , 92 ,
+93 , 93 , 93 , 94 , 94 , 94 , 94 , 95 , 95 ,
+95 , 95 , 96 , 96 , 96 , 96 , 97 , 97 , 97 ,
+97 , 98 , 98 , 98 , 98 , 99 , 99 , 99 , 99 , 99 
+};
+
+static void ac97_write_mixer(struct ess_card *card,int mixer, unsigned int left, unsigned int right)
+{
+	u16 val=0;
+	struct ac97_mixer_hw *mh = &ac97_hw[mixer];
+
+	M_printk("wrote mixer %d (0x%x) %d,%d",mixer,mh->offset,left,right);
+
+	if(AC97_STEREO_MASK & (1<<mixer)) {
+		/* stereo mixers, mute them if we can */
+
+		if (mixer == SOUND_MIXER_IGAIN) {
+			/* igain's slider is reversed.. */
+			right = (right * mh->scale) / 100;
+			left = (left * mh->scale) / 100;
+			if ((left == 0) && (right == 0))
+				val |= 0x8000;
+		} else if (mixer == SOUND_MIXER_PCM || mixer == SOUND_MIXER_CD) {
+			/* log conversion seems bad for them */
+			if ((left == 0) && (right == 0))
+				val = 0x8000;
+			right = ((100 - right) * mh->scale) / 100;
+			left = ((100 - left) * mh->scale) / 100;
+		} else {
+			/* log conversion for the stereo controls */
+			if((left == 0) && (right == 0))
+				val = 0x8000;
+			right = ((100 - lin2log[right]) * mh->scale) / 100;
+			left = ((100 - lin2log[left]) * mh->scale) / 100;
+		}
+
+		val |= (left << 8) | right;
+
+	} else if (mixer == SOUND_MIXER_SPEAKER) {
+		val = (((100 - left) * mh->scale) / 100) << 1;
+	} else if (mixer == SOUND_MIXER_MIC) {
+		val = maestro_ac97_get(card, mh->offset) & ~0x801f;
+		val |= (((100 - left) * mh->scale) / 100);
+	/*  the low bit is optional in the tone sliders and masking
+		it lets is avoid the 0xf 'bypass'.. */
+	} else if (mixer == SOUND_MIXER_BASS) {
+		val = maestro_ac97_get(card , mh->offset) & ~0x0f00;
+		val |= ((((100 - left) * mh->scale) / 100) << 8) & 0x0e00;
+	} else if (mixer == SOUND_MIXER_TREBLE)  {
+		val = maestro_ac97_get(card , mh->offset) & ~0x000f;
+		val |= (((100 - left) * mh->scale) / 100) & 0x000e;
+	}
+
+	maestro_ac97_set(card , mh->offset, val);
+	
+	M_printk(" -> %x\n",val);
+}
+
+/* the following tables allow us to go from 
+	OSS <-> ac97 quickly. */
+
+enum ac97_recsettings {
+	AC97_REC_MIC=0,
+	AC97_REC_CD,
+	AC97_REC_VIDEO,
+	AC97_REC_AUX,
+	AC97_REC_LINE,
+	AC97_REC_STEREO, /* combination of all enabled outputs..  */
+	AC97_REC_MONO,        /*.. or the mono equivalent */
+	AC97_REC_PHONE        
+};
+
+static unsigned int ac97_oss_mask[] = {
+	[AC97_REC_MIC] = SOUND_MASK_MIC, 
+	[AC97_REC_CD] = SOUND_MASK_CD, 
+	[AC97_REC_VIDEO] = SOUND_MASK_VIDEO, 
+	[AC97_REC_AUX] = SOUND_MASK_LINE1, 
+	[AC97_REC_LINE] = SOUND_MASK_LINE, 
+	[AC97_REC_PHONE] = SOUND_MASK_PHONEIN
+};
+
+/* indexed by bit position */
+static unsigned int ac97_oss_rm[] = {
+	[SOUND_MIXER_MIC] = AC97_REC_MIC,
+	[SOUND_MIXER_CD] = AC97_REC_CD,
+	[SOUND_MIXER_VIDEO] = AC97_REC_VIDEO,
+	[SOUND_MIXER_LINE1] = AC97_REC_AUX,
+	[SOUND_MIXER_LINE] = AC97_REC_LINE,
+	[SOUND_MIXER_PHONEIN] = AC97_REC_PHONE
+};
+	
+/* read or write the recmask 
+	the ac97 can really have left and right recording
+	inputs independently set, but OSS doesn't seem to 
+	want us to express that to the user. 
+	the caller guarantees that we have a supported bit set,
+	and they must be holding the card's spinlock */
+static int 
+ac97_recmask_io(struct ess_card *card, int read, int mask) 
+{
+	unsigned int val = ac97_oss_mask[ maestro_ac97_get(card, 0x1a) & 0x7 ];
+
+	if (read) return val;
+
+	/* oss can have many inputs, maestro can't.  try
+		to pick the 'new' one */
+
+	if (mask != val) mask &= ~val;
+
+	val = ffs(mask) - 1; 
+	val = ac97_oss_rm[val];
+	val |= val << 8;  /* set both channels */
+
+	M_printk("maestro: setting ac97 recmask to 0x%x\n",val);
+
+	maestro_ac97_set(card,0x1a,val);
+
+	return 0;
+};
+
+/*
+ *	The Maestro can be wired to a standard AC97 compliant codec
+ *	(see www.intel.com for the pdf's on this), or to a PT101 codec
+ *	which appears to be the ES1918 (data sheet on the esstech.com.tw site)
+ *
+ *	The PT101 setup is untested.
+ */
+ 
+static u16 __init maestro_ac97_init(struct ess_card *card)
+{
+	u16 vend1, vend2, caps;
+
+	card->mix.supported_mixers = AC97_SUPPORTED_MASK;
+	card->mix.stereo_mixers = AC97_STEREO_MASK;
+	card->mix.record_sources = AC97_RECORD_MASK;
+/*	card->mix.read_mixer = ac97_read_mixer;*/
+	card->mix.write_mixer = ac97_write_mixer;
+	card->mix.recmask_io = ac97_recmask_io;
+
+	vend1 = maestro_ac97_get(card, 0x7c);
+	vend2 = maestro_ac97_get(card, 0x7e);
+
+	caps = maestro_ac97_get(card, 0x00);
+
+	printk(KERN_INFO "maestro: AC97 Codec detected: v: 0x%2x%2x caps: 0x%x pwr: 0x%x\n",
+		vend1,vend2,caps,maestro_ac97_get(card,0x26) & 0xf);
+
+	if (! (caps & 0x4) ) {
+		/* no bass/treble nobs */
+		card->mix.supported_mixers &= ~(SOUND_MASK_BASS|SOUND_MASK_TREBLE);
+	}
+
+	/* XXX endianness, dork head. */
+	/* vendor specifc bits.. */
+	switch ((long)(vend1 << 16) | vend2) {
+	case 0x545200ff:	/* TriTech */
+		/* no idea what this does */
+		maestro_ac97_set(card,0x2a,0x0001);
+		maestro_ac97_set(card,0x2c,0x0000);
+		maestro_ac97_set(card,0x2c,0xffff);
+		break;
+#if 0	/* i thought the problems I was seeing were with
+	the 1921, but apparently they were with the pci board
+	it was on, so this code is commented out.
+	 lets see if this holds true. */
+	case 0x83847609:	/* ESS 1921 */
+		/* writing to 0xe (mic) or 0x1a (recmask) seems
+			to hang this codec */
+		card->mix.supported_mixers &= ~(SOUND_MASK_MIC);
+		card->mix.record_sources = 0;
+		card->mix.recmask_io = NULL;
+#if 0	/* don't ask.  I have yet to see what these actually do. */
+		maestro_ac97_set(card,0x76,0xABBA); /* o/~ Take a chance on me o/~ */
+		udelay(20);
+		maestro_ac97_set(card,0x78,0x3002);
+		udelay(20);
+		maestro_ac97_set(card,0x78,0x3802);
+		udelay(20);
+#endif
+		break;
+#endif
+	default: break;
+	}
+
+	maestro_ac97_set(card, 0x1E, 0x0404);
+	/* null misc stuff */
+	maestro_ac97_set(card, 0x20, 0x0000);
+
+	return 0;
+}
+
+#if 0  /* there has been 1 person on the planet with a pt101 that we
+	know of.  If they care, they can put this back in :) */
+static u16 maestro_pt101_init(struct ess_card *card,int iobase)
+{
+	printk(KERN_INFO "maestro: PT101 Codec detected, initializing but _not_ installing mixer device.\n");
+	/* who knows.. */
+	maestro_ac97_set(iobase, 0x2A, 0x0001);
+	maestro_ac97_set(iobase, 0x2C, 0x0000);
+	maestro_ac97_set(iobase, 0x2C, 0xFFFF);
+	maestro_ac97_set(iobase, 0x10, 0x9F1F);
+	maestro_ac97_set(iobase, 0x12, 0x0808);
+	maestro_ac97_set(iobase, 0x14, 0x9F1F);
+	maestro_ac97_set(iobase, 0x16, 0x9F1F);
+	maestro_ac97_set(iobase, 0x18, 0x0404);
+	maestro_ac97_set(iobase, 0x1A, 0x0000);
+	maestro_ac97_set(iobase, 0x1C, 0x0000);
+	maestro_ac97_set(iobase, 0x02, 0x0404);
+	maestro_ac97_set(iobase, 0x04, 0x0808);
+	maestro_ac97_set(iobase, 0x0C, 0x801F);
+	maestro_ac97_set(iobase, 0x0E, 0x801F);
+	return 0;
+}
+#endif
+
+/* this is very magic, and very slow.. */
+static void 
+maestro_ac97_reset(int ioaddr, struct pci_dev *pcidev)
+{
+	u16 save_68;
+	u16 w;
+	u32 vend;
+
+	outw( inw(ioaddr + 0x38) & 0xfffc, ioaddr + 0x38);
+	outw( inw(ioaddr + 0x3a) & 0xfffc, ioaddr + 0x3a);
+	outw( inw(ioaddr + 0x3c) & 0xfffc, ioaddr + 0x3c);
+
+	/* reset the first codec */
+	outw(0x0000,  ioaddr+0x36);
+	save_68 = inw(ioaddr+0x68);
+	pci_read_config_word(pcidev, 0x58, &w);	/* something magical with gpio and bus arb. */
+	pci_read_config_dword(pcidev, PCI_SUBSYSTEM_VENDOR_ID, &vend);
+	if( w & 0x1)
+		save_68 |= 0x10;
+	outw(0xfffe, ioaddr + 0x64);	/* tickly gpio 0.. */
+	outw(0x0001, ioaddr + 0x68);
+	outw(0x0000, ioaddr + 0x60);
+	udelay(20);
+	outw(0x0001, ioaddr + 0x60);
+	mdelay(20);
+
+	outw(save_68 | 0x1, ioaddr + 0x68);	/* now restore .. */
+	outw( (inw(ioaddr + 0x38) & 0xfffc)|0x1, ioaddr + 0x38);
+	outw( (inw(ioaddr + 0x3a) & 0xfffc)|0x1, ioaddr + 0x3a);
+	outw( (inw(ioaddr + 0x3c) & 0xfffc)|0x1, ioaddr + 0x3c);
+
+	/* now the second codec */
+	outw(0x0000,  ioaddr+0x36);
+	outw(0xfff7, ioaddr + 0x64);
+	save_68 = inw(ioaddr+0x68);
+	outw(0x0009, ioaddr + 0x68);
+	outw(0x0001, ioaddr + 0x60);
+	udelay(20);
+	outw(0x0009, ioaddr + 0x60);
+	mdelay(500);	/* .. ouch.. */
+	outw( inw(ioaddr + 0x38) & 0xfffc, ioaddr + 0x38);
+	outw( inw(ioaddr + 0x3a) & 0xfffc, ioaddr + 0x3a);
+	outw( inw(ioaddr + 0x3c) & 0xfffc, ioaddr + 0x3c);
+
+#if 0 /* the loop here needs to be much better if we want it.. */
+	M_printk("trying software reset\n");
+	/* try and do a software reset */
+	outb(0x80|0x7c, ioaddr + 0x30);
+	for (w=0; ; w++) {
+		if ((inw(ioaddr+ 0x30) & 1) == 0) {
+			if(inb(ioaddr + 0x32) !=0) break;
+
+			outb(0x80|0x7d, ioaddr + 0x30);
+			if (((inw(ioaddr+ 0x30) & 1) == 0) && (inb(ioaddr + 0x32) !=0)) break;
+			outb(0x80|0x7f, ioaddr + 0x30);
+			if (((inw(ioaddr+ 0x30) & 1) == 0) && (inb(ioaddr + 0x32) !=0)) break;
+		}
+
+		if( w > 10000) {
+			outb( inb(ioaddr + 0x37) | 0x08, ioaddr + 0x37);  /* do a software reset */
+			mdelay(500); /* oh my.. */
+			outb( inb(ioaddr + 0x37) & ~0x08, ioaddr + 0x37);  
+			udelay(1);
+			outw( 0x80, ioaddr+0x30);
+			for(w = 0 ; w < 10000; w++) {
+				if((inw(ioaddr + 0x30) & 1) ==0) break;
+			}
+		}
+	}
+#endif
+	if ( vend == NEC_VERSA_SUBID1 || vend == NEC_VERSA_SUBID2) {
+		/* turn on external amp? */
+		outw(0xf9ff, ioaddr + 0x64);
+		outw(inw(ioaddr+0x68) | 0x600, ioaddr + 0x68);
+		outw(0x0209, ioaddr + 0x60);
+	}
+
+	/* Turn on the 978 docking chip.
+	   First frob the "master output enable" bit,
+	   then set most of the playback volume control registers to max. */
+	outb(inb(ioaddr+0xc0)|(1<<5), ioaddr+0xc0);
+	outb(0xff, ioaddr+0xc3);
+	outb(0xff, ioaddr+0xc4);
+	outb(0xff, ioaddr+0xc6);
+	outb(0xff, ioaddr+0xc8);
+	outb(0x3f, ioaddr+0xcf);
+	outb(0x3f, ioaddr+0xd0);
+}
+/*
+ *	Indirect register access. Not all registers are readable so we
+ *	need to keep register state ourselves
+ */
+ 
+#define WRITEABLE_MAP	0xEFFFFF
+#define READABLE_MAP	0x64003F
+
+/*
+ *	The Maestro engineers were a little indirection happy. These indirected
+ *	registers themselves include indirect registers at another layer
+ */
+
+static void __maestro_write(struct ess_card *card, u16 reg, u16 data)
+{
+	long ioaddr = card->iobase;
+
+	outw(reg, ioaddr+0x02);
+	outw(data, ioaddr+0x00);
+	if( reg >= NR_IDRS) printk("maestro: IDR %d out of bounds!\n",reg);
+	else card->maestro_map[reg]=data;
+
+}
+ 
+static void maestro_write(struct ess_state *s, u16 reg, u16 data)
+{
+	unsigned long flags;
+
+	check_suspend(s->card);
+	spin_lock_irqsave(&s->card->lock,flags);
+
+	__maestro_write(s->card,reg,data);
+
+	spin_unlock_irqrestore(&s->card->lock,flags);
+}
+
+static u16 __maestro_read(struct ess_card *card, u16 reg)
+{
+	long ioaddr = card->iobase;
+
+	outw(reg, ioaddr+0x02);
+	return card->maestro_map[reg]=inw(ioaddr+0x00);
+}
+
+static u16 maestro_read(struct ess_state *s, u16 reg)
+{
+	if(READABLE_MAP & (1<<reg))
+	{
+		unsigned long flags;
+		check_suspend(s->card);
+		spin_lock_irqsave(&s->card->lock,flags);
+
+		__maestro_read(s->card,reg);
+
+		spin_unlock_irqrestore(&s->card->lock,flags);
+	}
+	return s->card->maestro_map[reg];
+}
+
+/*
+ *	These routines handle accessing the second level indirections to the
+ *	wave ram.
+ */
+
+/*
+ *	The register names are the ones ESS uses (see 104T31.ZIP)
+ */
+ 
+#define IDR0_DATA_PORT		0x00
+#define IDR1_CRAM_POINTER	0x01
+#define IDR2_CRAM_DATA		0x02
+#define IDR3_WAVE_DATA		0x03
+#define IDR4_WAVE_PTR_LOW	0x04
+#define IDR5_WAVE_PTR_HI	0x05
+#define IDR6_TIMER_CTRL		0x06
+#define IDR7_WAVE_ROMRAM	0x07
+
+static void apu_index_set(struct ess_card *card, u16 index)
+{
+	int i;
+	__maestro_write(card, IDR1_CRAM_POINTER, index);
+	for(i=0;i<1000;i++)
+		if(__maestro_read(card, IDR1_CRAM_POINTER)==index)
+			return;
+	printk(KERN_WARNING "maestro: APU register select failed.\n");
+}
+
+static void apu_data_set(struct ess_card *card, u16 data)
+{
+	int i;
+	for(i=0;i<1000;i++)
+	{
+		if(__maestro_read(card, IDR0_DATA_PORT)==data)
+			return;
+		__maestro_write(card, IDR0_DATA_PORT, data);
+	}
+}
+
+/*
+ *	This is the public interface for APU manipulation. It handles the
+ *	interlock to avoid two APU writes in parallel etc. Don't diddle
+ *	directly with the stuff above.
+ */
+
+static void apu_set_register(struct ess_state *s, u16 channel, u8 reg, u16 data)
+{
+	unsigned long flags;
+	
+	check_suspend(s->card);
+
+	if(channel&ESS_CHAN_HARD)
+		channel&=~ESS_CHAN_HARD;
+	else
+	{
+		if(channel>5)
+			printk("BAD CHANNEL %d.\n",channel);
+		else
+			channel = s->apu[channel];
+		/* store based on real hardware apu/reg */
+		s->card->apu_map[channel][reg]=data;
+	}
+	reg|=(channel<<4);
+	
+	/* hooray for double indirection!! */
+	spin_lock_irqsave(&s->card->lock,flags);
+
+	apu_index_set(s->card, reg);
+	apu_data_set(s->card, data);
+
+	spin_unlock_irqrestore(&s->card->lock,flags);
+}
+
+static u16 apu_get_register(struct ess_state *s, u16 channel, u8 reg)
+{
+	unsigned long flags;
+	u16 v;
+	
+	check_suspend(s->card);
+
+	if(channel&ESS_CHAN_HARD)
+		channel&=~ESS_CHAN_HARD;
+	else
+		channel = s->apu[channel];
+
+	reg|=(channel<<4);
+	
+	spin_lock_irqsave(&s->card->lock,flags);
+
+	apu_index_set(s->card, reg);
+	v=__maestro_read(s->card, IDR0_DATA_PORT);
+
+	spin_unlock_irqrestore(&s->card->lock,flags);
+	return v;
+}
+
+
+/*
+ *	The wavecache buffers between the APUs and
+ *	pci bus mastering
+ */
+ 
+static void wave_set_register(struct ess_state *s, u16 reg, u16 value)
+{
+	long ioaddr = s->card->iobase;
+	unsigned long flags;
+	check_suspend(s->card);
+	
+	spin_lock_irqsave(&s->card->lock,flags);
+
+	outw(reg, ioaddr+0x10);
+	outw(value, ioaddr+0x12);
+
+	spin_unlock_irqrestore(&s->card->lock,flags);
+}
+
+static u16 wave_get_register(struct ess_state *s, u16 reg)
+{
+	long ioaddr = s->card->iobase;
+	unsigned long flags;
+	u16 value;
+	check_suspend(s->card);
+	
+	spin_lock_irqsave(&s->card->lock,flags);
+	outw(reg, ioaddr+0x10);
+	value=inw(ioaddr+0x12);
+	spin_unlock_irqrestore(&s->card->lock,flags);
+	
+	return value;
+}
+
+static void sound_reset(int ioaddr)
+{
+	outw(0x2000, 0x18+ioaddr);
+	udelay(1);
+	outw(0x0000, 0x18+ioaddr);
+	udelay(1);
+}
+
+/* sets the play formats of these apus, should be passed the already shifted format */
+static void set_apu_fmt(struct ess_state *s, int apu, int mode)
+{
+	int apu_fmt = 0x10;
+
+	if(!(mode&ESS_FMT_16BIT)) apu_fmt+=0x20; 
+	if((mode&ESS_FMT_STEREO)) apu_fmt+=0x10; 
+	s->apu_mode[apu]   = apu_fmt;
+	s->apu_mode[apu+1] = apu_fmt;
+}
+
+/* this only fixes the output apu mode to be later set by start_dac and
+	company.  output apu modes are set in ess_rec_setup */
+static void set_fmt(struct ess_state *s, unsigned char mask, unsigned char data)
+{
+	s->fmt = (s->fmt & mask) | data;
+	set_apu_fmt(s, 0, (s->fmt >> ESS_DAC_SHIFT) & ESS_FMT_MASK);
+}
+
+/* this is off by a little bit.. */
+static u32 compute_rate(struct ess_state *s, u32 freq)
+{
+	u32 clock = clock_freq[s->card->card_type];     
+
+	freq = (freq * clocking)/48000;
+	
+	if (freq == 48000) 
+		return 0x10000;
+
+	return ((freq / clock) <<16 )+  
+		(((freq % clock) << 16) / clock);
+}
+
+static void set_dac_rate(struct ess_state *s, unsigned int rate)
+{
+	u32 freq;
+	int fmt = (s->fmt >> ESS_DAC_SHIFT) & ESS_FMT_MASK;
+
+	if (rate > 48000)
+		rate = 48000;
+	if (rate < 4000)
+		rate = 4000;
+
+	s->ratedac = rate;
+
+	if(! (fmt & ESS_FMT_16BIT) && !(fmt & ESS_FMT_STEREO))
+		rate >>= 1;
+
+/*	M_printk("computing dac rate %d with mode %d\n",rate,s->fmt);*/
+
+	freq = compute_rate(s, rate);
+	
+	/* Load the frequency, turn on 6dB */
+	apu_set_register(s, 0, 2,(apu_get_register(s, 0, 2)&0x00FF)|
+		( ((freq&0xFF)<<8)|0x10 ));
+	apu_set_register(s, 0, 3, freq>>8);
+	apu_set_register(s, 1, 2,(apu_get_register(s, 1, 2)&0x00FF)|
+		( ((freq&0xFF)<<8)|0x10 ));
+	apu_set_register(s, 1, 3, freq>>8);
+}
+
+static void set_adc_rate(struct ess_state *s, unsigned rate)
+{
+	u32 freq;
+
+	/* Sample Rate conversion APUs don't like 0x10000 for their rate */
+	if (rate > 47999)
+		rate = 47999;
+	if (rate < 4000)
+		rate = 4000;
+
+	s->rateadc = rate;
+
+	freq = compute_rate(s, rate);
+	
+	/* Load the frequency, turn on 6dB */
+	apu_set_register(s, 2, 2,(apu_get_register(s, 2, 2)&0x00FF)|
+		( ((freq&0xFF)<<8)|0x10 ));
+	apu_set_register(s, 2, 3, freq>>8);
+	apu_set_register(s, 3, 2,(apu_get_register(s, 3, 2)&0x00FF)|
+		( ((freq&0xFF)<<8)|0x10 ));
+	apu_set_register(s, 3, 3, freq>>8);
+
+	/* fix mixer rate at 48khz.  and its _must_ be 0x10000. */
+	freq = 0x10000;
+
+	apu_set_register(s, 4, 2,(apu_get_register(s, 4, 2)&0x00FF)|
+		( ((freq&0xFF)<<8)|0x10 ));
+	apu_set_register(s, 4, 3, freq>>8);
+	apu_set_register(s, 5, 2,(apu_get_register(s, 5, 2)&0x00FF)|
+		( ((freq&0xFF)<<8)|0x10 ));
+	apu_set_register(s, 5, 3, freq>>8);
+}
+
+/* Stop our host of recording apus */
+static inline void stop_adc(struct ess_state *s)
+{
+	/* XXX lets hope we don't have to lock around this */
+	if (! (s->enable & ADC_RUNNING)) return;
+
+	s->enable &= ~ADC_RUNNING;
+	apu_set_register(s, 2, 0, apu_get_register(s, 2, 0)&0xFF0F);
+	apu_set_register(s, 3, 0, apu_get_register(s, 3, 0)&0xFF0F);
+	apu_set_register(s, 4, 0, apu_get_register(s, 2, 0)&0xFF0F);
+	apu_set_register(s, 5, 0, apu_get_register(s, 3, 0)&0xFF0F);
+}	
+
+/* stop output apus */
+static void stop_dac(struct ess_state *s)
+{
+	/* XXX have to lock around this? */
+	if (! (s->enable & DAC_RUNNING)) return;
+
+	s->enable &= ~DAC_RUNNING;
+	apu_set_register(s, 0, 0, apu_get_register(s, 0, 0)&0xFF0F);
+	apu_set_register(s, 1, 0, apu_get_register(s, 1, 0)&0xFF0F);
+}	
+
+static void start_dac(struct ess_state *s)
+{
+	/* XXX locks? */
+	if (	(s->dma_dac.mapped || s->dma_dac.count > 0) && 
+		s->dma_dac.ready &&
+		(! (s->enable & DAC_RUNNING)) ) {
+
+		s->enable |= DAC_RUNNING;
+
+		apu_set_register(s, 0, 0, 
+			(apu_get_register(s, 0, 0)&0xFF0F)|s->apu_mode[0]);
+
+		if((s->fmt >> ESS_DAC_SHIFT)  & ESS_FMT_STEREO) 
+			apu_set_register(s, 1, 0, 
+				(apu_get_register(s, 1, 0)&0xFF0F)|s->apu_mode[1]);
+	}
+}	
+
+static void start_adc(struct ess_state *s)
+{
+	/* XXX locks? */
+	if ((s->dma_adc.mapped || s->dma_adc.count < (signed)(s->dma_adc.dmasize - 2*s->dma_adc.fragsize)) 
+	    && s->dma_adc.ready && (! (s->enable & ADC_RUNNING)) ) {
+
+		s->enable |= ADC_RUNNING;
+		apu_set_register(s, 2, 0, 
+			(apu_get_register(s, 2, 0)&0xFF0F)|s->apu_mode[2]);
+		apu_set_register(s, 4, 0, 
+			(apu_get_register(s, 4, 0)&0xFF0F)|s->apu_mode[4]);
+
+		if( s->fmt & (ESS_FMT_STEREO << ESS_ADC_SHIFT)) {
+			apu_set_register(s, 3, 0, 
+				(apu_get_register(s, 3, 0)&0xFF0F)|s->apu_mode[3]);
+			apu_set_register(s, 5, 0, 
+				(apu_get_register(s, 5, 0)&0xFF0F)|s->apu_mode[5]);
+		}
+			
+	}
+}	
+
+
+/*
+ *	Native play back driver 
+ */
+
+/* the mode passed should be already shifted and masked */
+static void 
+ess_play_setup(struct ess_state *ess, int mode, u32 rate, void *buffer, int size)
+{
+	u32 pa;
+	u32 tmpval;
+	int high_apu = 0;
+	int channel;
+
+	M_printk("mode=%d rate=%d buf=%p len=%d.\n",
+		mode, rate, buffer, size);
+		
+	/* all maestro sizes are in 16bit words */
+	size >>=1;
+
+	if(mode&ESS_FMT_STEREO) {
+		high_apu++;
+		/* only 16/stereo gets size divided */
+		if(mode&ESS_FMT_16BIT)
+			size>>=1;
+	}
+	
+	for(channel=0; channel <= high_apu; channel++)
+	{
+		pa = virt_to_bus(buffer);
+
+		/* set the wavecache control reg */
+		tmpval = (pa - 0x10) & 0xFFF8;
+		if(!(mode & ESS_FMT_16BIT)) tmpval |= 4;
+		if(mode & ESS_FMT_STEREO) tmpval |= 2;
+		ess->apu_base[channel]=tmpval;
+		wave_set_register(ess, ess->apu[channel]<<3, tmpval);
+		
+		pa -= virt_to_bus(ess->card->dmapages);
+		pa>>=1; /* words */
+		
+		/* base offset of dma calcs when reading the pointer
+			on the left one */
+		if(!channel) ess->dma_dac.base = pa&0xFFFF;
+		
+		pa|=0x00400000;			/* System RAM */
+
+		/* XXX the 16bit here might not be needed.. */
+		if((mode & ESS_FMT_STEREO) && (mode & ESS_FMT_16BIT)) {
+			if(channel) 
+				pa|=0x00800000;			/* Stereo */
+			pa>>=1;
+		}
+			
+/* XXX think about endianess when writing these registers */
+		M_printk("maestro: ess_play_setup: APU[%d] pa = 0x%x\n", ess->apu[channel], pa);
+		/* start of sample */
+		apu_set_register(ess, channel, 4, ((pa>>16)&0xFF)<<8);
+		apu_set_register(ess, channel, 5, pa&0xFFFF);
+		/* sample end */
+		apu_set_register(ess, channel, 6, (pa+size)&0xFFFF);
+		/* setting loop len == sample len */
+		apu_set_register(ess, channel, 7, size);
+		
+		/* clear effects/env.. */
+		apu_set_register(ess, channel, 8, 0x0000);
+		/* set amp now to 0xd0 (?), low byte is 'amplitude dest'? */
+		apu_set_register(ess, channel, 9, 0xD000);
+
+		/* clear routing stuff */
+		apu_set_register(ess, channel, 11, 0x0000);
+		/* dma on, no envelopes, filter to all 1s) */
+		apu_set_register(ess, channel, 0, 0x400F);
+		
+		if(mode&ESS_FMT_16BIT)
+			ess->apu_mode[channel]=0x10;
+		else
+			ess->apu_mode[channel]=0x30;
+
+		if(mode&ESS_FMT_STEREO) {
+			/* set panning: left or right */
+			apu_set_register(ess, channel, 10, 0x8F00 | (channel ? 0 : 0x10));
+			ess->apu_mode[channel] += 0x10;
+		} else
+			apu_set_register(ess, channel, 10, 0x8F08);
+	}
+	
+	/* clear WP interrupts */
+	outw(1, ess->card->iobase+0x04);
+	/* enable WP ints */
+	outw(inw(ess->card->iobase+0x18)|4, ess->card->iobase+0x18);
+
+	/* go team! */
+	set_dac_rate(ess,rate);
+	start_dac(ess);
+}
+
+/*
+ *	Native record driver 
+ */
+
+/* again, passed mode is alrady shifted/masked */
+static void 
+ess_rec_setup(struct ess_state *ess, int mode, u32 rate, void *buffer, int size)
+{
+	int apu_step = 2;
+	int channel;
+
+	M_printk("maestro: ess_rec_setup: mode=%d rate=%d buf=0x%p len=%d.\n",
+		mode, rate, buffer, size);
+		
+	/* all maestro sizes are in 16bit words */
+	size >>=1;
+
+	/* we're given the full size of the buffer, but
+	in stereo each channel will only use its half */
+	if(mode&ESS_FMT_STEREO) {
+		size >>=1; 
+		apu_step = 1;
+	}
+	
+	/* APU assignments: 2 = mono/left SRC
+	                    3 = right SRC
+	                    4 = mono/left Input Mixer
+	                    5 = right Input Mixer */
+	for(channel=2;channel<6;channel+=apu_step)
+	{
+		int i;
+		int bsize, route;
+		u32 pa;
+		u32 tmpval;
+
+		/* data seems to flow from the codec, through an apu into
+			the 'mixbuf' bit of page, then through the SRC apu
+			and out to the real 'buffer'.  ok.  sure.  */
+		
+		if(channel & 0x04) {
+			/* ok, we're an input mixer going from adc
+				through the mixbuf to the other apus */
+
+			if(!(channel & 0x01)) { 
+				pa = virt_to_bus(ess->mixbuf);
+			} else {
+				pa = virt_to_bus(ess->mixbuf + (PAGE_SIZE >> 4));
+			}
+
+			/* we source from a 'magic' apu */
+			bsize = PAGE_SIZE >> 5;	/* half of this channels alloc, in words */
+			route = 0x14 + (channel - 4); /* parallel in crap, see maestro reg 0xC [8-11] */
+			ess->apu_mode[channel] = 0x90;  /* Input Mixer */
+
+		} else {  
+			/* we're a rate converter taking
+				input from the input apus and outputing it to
+				system memory */
+			if(!(channel & 0x01))  {
+				pa = virt_to_bus(buffer);
+			} else {
+				/* right channel records its split half.
+				*2 accommodates for rampant shifting earlier */
+				pa = virt_to_bus(buffer + size*2);
+			}
+
+			ess->apu_mode[channel] = 0xB0;  /* Sample Rate Converter */
+
+			bsize = size; 
+			/* get input from inputing apu */
+			route = channel + 2;
+		}
+
+		M_printk("maestro: ess_rec_setup: getting pa 0x%x from %d\n",pa,channel);
+		
+		/* set the wavecache control reg */
+		tmpval = (pa - 0x10) & 0xFFF8;
+		ess->apu_base[channel]=tmpval;
+		wave_set_register(ess, ess->apu[channel]<<3, tmpval);
+		
+		pa -= virt_to_bus(ess->card->dmapages);
+		pa>>=1; /* words */
+		
+		/* base offset of dma calcs when reading the pointer
+			on this left one */
+		if(channel==2) ess->dma_adc.base = pa&0xFFFF;
+
+		pa|=0x00400000;			/* bit 22 -> System RAM */
+
+		M_printk("maestro: ess_rec_setup: APU[%d] pa = 0x%x size = 0x%x route = 0x%x\n", 
+			ess->apu[channel], pa, bsize, route);
+		
+		/* Begin loading the APU */		
+		for(i=0;i<15;i++)		/* clear all PBRs */
+			apu_set_register(ess, channel, i, 0x0000);
+			
+		apu_set_register(ess, channel, 0, 0x400F);
+
+		/* need to enable subgroups.. and we should probably
+			have different groups for different /dev/dsps..  */
+ 		apu_set_register(ess, channel, 2, 0x8);
+				
+		/* Load the buffer into the wave engine */
+		apu_set_register(ess, channel, 4, ((pa>>16)&0xFF)<<8);
+		/* XXX reg is little endian.. */
+		apu_set_register(ess, channel, 5, pa&0xFFFF);
+		apu_set_register(ess, channel, 6, (pa+bsize)&0xFFFF);
+		apu_set_register(ess, channel, 7, bsize);
+				
+		/* clear effects/env.. */
+		apu_set_register(ess, channel, 8, 0x00F0);
+		
+		/* amplitude now?  sure.  why not.  */
+		apu_set_register(ess, channel, 9, 0x0000);
+
+		/* set filter tune, radius, polar pan */
+		apu_set_register(ess, channel, 10, 0x8F08);
+
+		/* route input */
+		apu_set_register(ess, channel, 11, route);
+	}
+	
+	/* clear WP interrupts */
+	outw(1, ess->card->iobase+0x04);
+	/* enable WP ints */
+	outw(inw(ess->card->iobase+0x18)|4, ess->card->iobase+0x18);
+
+	/* let 'er rip */
+	set_adc_rate(ess,rate);
+	start_adc(ess);
+}
+/* --------------------------------------------------------------------- */
+
+static void set_dmaa(struct ess_state *s, unsigned int addr, unsigned int count)
+{
+	M_printk("set_dmaa??\n");
+}
+
+static void set_dmac(struct ess_state *s, unsigned int addr, unsigned int count)
+{
+	M_printk("set_dmac??\n");
+}
+
+/* Playback pointer */
+static inline unsigned get_dmaa(struct ess_state *s)
+{
+	int offset;
+
+	offset = apu_get_register(s,0,5);
+
+/*	M_printk("dmaa: offset: %d, base: %d\n",offset,s->dma_dac.base); */
+	
+	offset-=s->dma_dac.base;
+
+	return (offset&0xFFFE)<<1; /* hardware is in words */
+}
+
+/* Record pointer */
+static inline unsigned get_dmac(struct ess_state *s)
+{
+	int offset;
+
+	offset = apu_get_register(s,2,5);
+
+/*	M_printk("dmac: offset: %d, base: %d\n",offset,s->dma_adc.base); */
+	
+	/* The offset is an address not a position relative to base */
+	offset-=s->dma_adc.base;
+	
+	return (offset&0xFFFE)<<1; /* hardware is in words */
+}
+
+/*
+ *	Meet Bob, the timer...
+ */
+
+static irqreturn_t ess_interrupt(int irq, void *dev_id, struct pt_regs *regs);
+
+static void stop_bob(struct ess_state *s)
+{
+	/* Mask IDR 11,17 */
+	maestro_write(s,  0x11, maestro_read(s, 0x11)&~1);
+	maestro_write(s,  0x17, maestro_read(s, 0x17)&~1);
+}
+
+/* eventually we could be clever and limit bob ints
+	to the frequency at which our smallest duration
+	chunks may expire */
+#define ESS_SYSCLK	50000000
+static void start_bob(struct ess_state *s)
+{
+	int prescale;
+	int divide;
+	
+	/* XXX make freq selector much smarter, see calc_bob_rate */
+	int freq = 200; 
+	
+	/* compute ideal interrupt frequency for buffer size & play rate */
+	/* first, find best prescaler value to match freq */
+	for(prescale=5;prescale<12;prescale++)
+		if(freq > (ESS_SYSCLK>>(prescale+9)))
+			break;
+			
+	/* next, back off prescaler whilst getting divider into optimum range */
+	divide=1;
+	while((prescale > 5) && (divide<32))
+	{
+		prescale--;
+		divide <<=1;
+	}
+	divide>>=1;
+	
+	/* now fine-tune the divider for best match */
+	for(;divide<31;divide++)
+		if(freq >= ((ESS_SYSCLK>>(prescale+9))/(divide+1)))
+			break;
+	
+	/* divide = 0 is illegal, but don't let prescale = 4! */
+	if(divide == 0)
+	{
+		divide++;
+		if(prescale>5)
+			prescale--;
+	}
+
+	maestro_write(s, 6, 0x9000 | (prescale<<5) | divide); /* set reg */
+	
+	/* Now set IDR 11/17 */
+	maestro_write(s, 0x11, maestro_read(s, 0x11)|1);
+	maestro_write(s, 0x17, maestro_read(s, 0x17)|1);
+}
+/* --------------------------------------------------------------------- */
+
+/* this quickly calculates the frequency needed for bob
+	and sets it if its different than what bob is
+	currently running at.  its called often so 
+	needs to be fairly quick. */
+#define BOB_MIN 50
+#define BOB_MAX 400
+static void calc_bob_rate(struct ess_state *s) {
+#if 0 /* this thing tries to set the frequency of bob such that
+	there are 2 interrupts / buffer walked by the dac/adc.  That
+	is probably very wrong for people who actually care about 
+	mid buffer positioning.  it should be calculated as bytes/interrupt
+	and that needs to be decided :)  so for now just use the static 150
+	in start_bob.*/
+
+	unsigned int dac_rate=2,adc_rate=1,newrate;
+	static int israte=-1;
+
+	if (s->dma_dac.fragsize == 0) dac_rate = BOB_MIN;
+	else  {
+		dac_rate =	(2 * s->ratedac * sample_size[(s->fmt >> ESS_DAC_SHIFT) & ESS_FMT_MASK]) /
+				(s->dma_dac.fragsize) ;
+	}
+		
+	if (s->dma_adc.fragsize == 0) adc_rate = BOB_MIN;
+	else {
+		adc_rate =	(2 * s->rateadc * sample_size[(s->fmt >> ESS_DAC_SHIFT) & ESS_FMT_MASK]) /
+				(s->dma_adc.fragsize) ;
+	}
+
+	if(dac_rate > adc_rate) newrate = adc_rate;
+	else newrate=dac_rate;
+
+	if(newrate > BOB_MAX) newrate = BOB_MAX;
+	else {
+		if(newrate < BOB_MIN) 
+			newrate = BOB_MIN;
+	}
+
+	if( israte != newrate) {
+		printk("dac: %d  adc: %d rate: %d\n",dac_rate,adc_rate,israte);
+		israte=newrate;
+	}
+#endif
+
+}
+
+static int 
+prog_dmabuf(struct ess_state *s, unsigned rec)
+{
+	struct dmabuf *db = rec ? &s->dma_adc : &s->dma_dac;
+	unsigned rate = rec ? s->rateadc : s->ratedac;
+	unsigned bytepersec;
+	unsigned bufs;
+	unsigned char fmt;
+	unsigned long flags;
+
+	spin_lock_irqsave(&s->lock, flags);
+	fmt = s->fmt;
+	if (rec) {
+		stop_adc(s);
+		fmt >>= ESS_ADC_SHIFT;
+	} else {
+		stop_dac(s);
+		fmt >>= ESS_DAC_SHIFT;
+	}
+	spin_unlock_irqrestore(&s->lock, flags);
+	fmt &= ESS_FMT_MASK;
+
+	db->hwptr = db->swptr = db->total_bytes = db->count = db->error = db->endcleared = 0;
+
+	/* this algorithm is a little nuts.. where did /1000 come from? */
+	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;
+
+	M_printk("maestro: setup oss: numfrag: %d fragsize: %d dmasize: %d\n",db->numfrag,db->fragsize,db->dmasize);
+
+	memset(db->rawbuf, (fmt & ESS_FMT_16BIT) ? 0 : 0x80, db->dmasize);
+
+	spin_lock_irqsave(&s->lock, flags);
+	if (rec) 
+		ess_rec_setup(s, fmt, s->rateadc, db->rawbuf, db->dmasize);
+	else 
+		ess_play_setup(s, fmt, s->ratedac, db->rawbuf, db->dmasize);
+
+	spin_unlock_irqrestore(&s->lock, flags);
+	db->ready = 1;
+
+	return 0;
+}
+
+static __inline__ void 
+clear_advance(struct ess_state *s)
+{
+	unsigned char c = ((s->fmt >> ESS_DAC_SHIFT) & ESS_FMT_16BIT) ? 0 : 0x80;
+	
+	unsigned char *buf = s->dma_dac.rawbuf;
+	unsigned bsize = s->dma_dac.dmasize;
+	unsigned bptr = s->dma_dac.swptr;
+	unsigned len = s->dma_dac.fragsize;
+	
+	if (bptr + len > bsize) {
+		unsigned x = bsize - bptr;
+		memset(buf + bptr, c, x);
+		/* account for wrapping? */
+		bptr = 0;
+		len -= x;
+	}
+	memset(buf + bptr, c, len);
+}
+
+/* call with spinlock held! */
+static void 
+ess_update_ptr(struct ess_state *s)
+{
+	unsigned hwptr;
+	int diff;
+
+	/* update ADC pointer */
+	if (s->dma_adc.ready) {
+		/* oh boy should this all be re-written.  everything in the current code paths think
+		that the various counters/pointers are expressed in bytes to the user but we have
+		two apus doing stereo stuff so we fix it up here.. it propagates to all the various
+		counters from here.  */
+		if ( s->fmt & (ESS_FMT_STEREO << ESS_ADC_SHIFT)) {
+			hwptr = (get_dmac(s)*2) % s->dma_adc.dmasize;
+		} else {
+			hwptr = get_dmac(s) % s->dma_adc.dmasize;
+		}
+		diff = (s->dma_adc.dmasize + hwptr - s->dma_adc.hwptr) % s->dma_adc.dmasize;
+		s->dma_adc.hwptr = hwptr;
+		s->dma_adc.total_bytes += diff;
+		s->dma_adc.count += diff;
+		if (s->dma_adc.count >= (signed)s->dma_adc.fragsize) 
+			wake_up(&s->dma_adc.wait);
+		if (!s->dma_adc.mapped) {
+			if (s->dma_adc.count > (signed)(s->dma_adc.dmasize - ((3 * s->dma_adc.fragsize) >> 1))) {
+				/* FILL ME 
+				wrindir(s, SV_CIENABLE, s->enable); */
+				stop_adc(s); 
+				/* brute force everyone back in sync, sigh */
+				s->dma_adc.count = 0;
+				s->dma_adc.swptr = 0;
+				s->dma_adc.hwptr = 0;
+				s->dma_adc.error++;
+			}
+		}
+	}
+	/* update DAC pointer */
+	if (s->dma_dac.ready) {
+		hwptr = get_dmaa(s) % s->dma_dac.dmasize; 
+		/* the apu only reports the length it has seen, not the
+			length of the memory that has been used (the WP
+			knows that) */
+		if ( ((s->fmt >> ESS_DAC_SHIFT) & ESS_FMT_MASK) == (ESS_FMT_STEREO|ESS_FMT_16BIT))
+			hwptr<<=1;
+
+		diff = (s->dma_dac.dmasize + hwptr - s->dma_dac.hwptr) % s->dma_dac.dmasize;
+/*		M_printk("updating dac: hwptr: %d diff: %d\n",hwptr,diff);*/
+		s->dma_dac.hwptr = hwptr;
+		s->dma_dac.total_bytes += diff;
+		if (s->dma_dac.mapped) {
+			s->dma_dac.count += diff;
+			if (s->dma_dac.count >= (signed)s->dma_dac.fragsize) {
+				wake_up(&s->dma_dac.wait);
+			}
+		} else {
+			s->dma_dac.count -= diff;
+/*			M_printk("maestro: ess_update_ptr: diff: %d, count: %d\n", diff, s->dma_dac.count); */
+			if (s->dma_dac.count <= 0) {
+				M_printk("underflow! diff: %d count: %d hw: %d sw: %d\n", diff, s->dma_dac.count, 
+					hwptr, s->dma_dac.swptr);
+				/* FILL ME 
+				wrindir(s, SV_CIENABLE, s->enable); */
+				/* XXX how on earth can calling this with the lock held work.. */
+				stop_dac(s);
+				/* brute force everyone back in sync, sigh */
+				s->dma_dac.count = 0; 
+				s->dma_dac.swptr = hwptr; 
+				s->dma_dac.error++;
+			} else if (s->dma_dac.count <= (signed)s->dma_dac.fragsize && !s->dma_dac.endcleared) {
+				clear_advance(s);
+				s->dma_dac.endcleared = 1;
+			}
+			if (s->dma_dac.count + (signed)s->dma_dac.fragsize <= (signed)s->dma_dac.dmasize) {
+				wake_up(&s->dma_dac.wait);
+/*				printk("waking up DAC count: %d sw: %d hw: %d\n",s->dma_dac.count, s->dma_dac.swptr, 
+					hwptr);*/
+			}
+		}
+	}
+}
+
+static irqreturn_t
+ess_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+        struct ess_state *s;
+        struct ess_card *c = (struct ess_card *)dev_id;
+	int i;
+	u32 event;
+
+	if ( ! (event = inb(c->iobase+0x1A)) )
+		return IRQ_NONE;
+
+	outw(inw(c->iobase+4)&1, c->iobase+4);
+
+/*	M_printk("maestro int: %x\n",event);*/
+	if(event&(1<<6))
+	{
+		int x;
+		enum {UP_EVT, DOWN_EVT, MUTE_EVT} vol_evt;
+		int volume;
+
+		/* Figure out which volume control button was pushed,
+		   based on differences from the default register
+		   values. */
+		x = inb(c->iobase+0x1c);
+		if (x&1) vol_evt = MUTE_EVT;
+		else if (((x>>1)&7) > 4) vol_evt = UP_EVT;
+		else vol_evt = DOWN_EVT;
+
+		/* Reset the volume control registers. */
+		outb(0x88, c->iobase+0x1c);
+		outb(0x88, c->iobase+0x1d);
+		outb(0x88, c->iobase+0x1e);
+		outb(0x88, c->iobase+0x1f);
+
+		/* Deal with the button press in a hammer-handed
+		   manner by adjusting the master mixer volume. */
+		volume = c->mix.mixer_state[0] & 0xff;
+		if (vol_evt == UP_EVT) {
+			volume += 5;
+			if (volume > 100)
+				volume = 100;
+		}
+		else if (vol_evt == DOWN_EVT) {
+			volume -= 5;
+			if (volume < 0)
+				volume = 0;
+		} else {
+			/* vol_evt == MUTE_EVT */
+			if (volume == 0)
+				volume = c->dock_mute_vol;
+			else {
+				c->dock_mute_vol = volume;
+				volume = 0;
+			}
+		}
+		set_mixer (c, 0, (volume << 8) | volume);
+	}
+
+	/* Ack all the interrupts. */
+	outb(0xFF, c->iobase+0x1A);
+		
+	/*
+	 *	Update the pointers for all APU's we are running.
+	 */
+	for(i=0;i<NR_DSPS;i++)
+	{
+		s=&c->channels[i];
+		if(s->dev_audio == -1)
+			break;
+		spin_lock(&s->lock);
+		ess_update_ptr(s);
+		spin_unlock(&s->lock);
+	}
+	return IRQ_HANDLED;
+}
+
+
+/* --------------------------------------------------------------------- */
+
+static const char invalid_magic[] = KERN_CRIT "maestro: invalid magic value in %s\n";
+
+#define VALIDATE_MAGIC(FOO,MAG)                         \
+({                                                \
+	if (!(FOO) || (FOO)->magic != MAG) { \
+		printk(invalid_magic,__FUNCTION__);            \
+		return -ENXIO;                    \
+	}                                         \
+})
+
+#define VALIDATE_STATE(a) VALIDATE_MAGIC(a,ESS_STATE_MAGIC)
+#define VALIDATE_CARD(a) VALIDATE_MAGIC(a,ESS_CARD_MAGIC)
+
+static void set_mixer(struct ess_card *card,unsigned int mixer, unsigned int val ) 
+{
+	unsigned int left,right;
+	/* cleanse input a little */
+	right = ((val >> 8)  & 0xff) ;
+	left = (val  & 0xff) ;
+
+	if(right > 100) right = 100;
+	if(left > 100) left = 100;
+
+	card->mix.mixer_state[mixer]=(right << 8) | left;
+	card->mix.write_mixer(card,mixer,left,right);
+}
+
+static void
+mixer_push_state(struct ess_card *card)
+{
+	int i;
+	for(i = 0 ; i < SOUND_MIXER_NRDEVICES ; i++) {
+		if( ! supported_mixer(card,i)) continue;
+
+		set_mixer(card,i,card->mix.mixer_state[i]);
+	}
+}
+
+static int mixer_ioctl(struct ess_card *card, unsigned int cmd, unsigned long arg)
+{
+	int i, val=0;
+	unsigned long flags;
+	void __user *argp = (void __user *)arg;
+	int __user *p = argp;
+
+	VALIDATE_CARD(card);
+        if (cmd == SOUND_MIXER_INFO) {
+		mixer_info info;
+		memset(&info, 0, sizeof(info));
+		strlcpy(info.id, card_names[card->card_type], sizeof(info.id));
+		strlcpy(info.name, card_names[card->card_type], sizeof(info.name));
+		info.modify_counter = card->mix.modcnt;
+		if (copy_to_user(argp, &info, sizeof(info)))
+			return -EFAULT;
+		return 0;
+	}
+	if (cmd == SOUND_OLD_MIXER_INFO) {
+		_old_mixer_info info;
+		memset(&info, 0, sizeof(info));
+		strlcpy(info.id, card_names[card->card_type], sizeof(info.id));
+		strlcpy(info.name, card_names[card->card_type], sizeof(info.name));
+		if (copy_to_user(argp, &info, sizeof(info)))
+			return -EFAULT;
+		return 0;
+	}
+	if (cmd == OSS_GETVERSION)
+		return put_user(SOUND_VERSION, p);
+
+	if (_IOC_TYPE(cmd) != 'M' || _IOC_SIZE(cmd) != sizeof(int))
+                return -EINVAL;
+
+        if (_IOC_DIR(cmd) == _IOC_READ) {
+                switch (_IOC_NR(cmd)) {
+                case SOUND_MIXER_RECSRC: /* give them the current record source */
+
+			if(!card->mix.recmask_io) {
+				val = 0;
+			} else {
+                               spin_lock_irqsave(&card->lock, flags);
+				val = card->mix.recmask_io(card,1,0);
+                               spin_unlock_irqrestore(&card->lock, flags);
+			}
+			break;
+			
+                case SOUND_MIXER_DEVMASK: /* give them the supported mixers */
+			val = card->mix.supported_mixers;
+			break;
+
+                case SOUND_MIXER_RECMASK: /* Arg contains a bit for each supported recording source */
+			val = card->mix.record_sources;
+			break;
+			
+                case SOUND_MIXER_STEREODEVS: /* Mixer channels supporting stereo */
+			val = card->mix.stereo_mixers;
+			break;
+			
+                case SOUND_MIXER_CAPS:
+			val = SOUND_CAP_EXCL_INPUT;
+			break;
+
+		default: /* read a specific mixer */
+			i = _IOC_NR(cmd);
+
+			if ( ! supported_mixer(card,i)) 
+				return -EINVAL;
+
+			/* do we ever want to touch the hardware? */
+/*                     spin_lock_irqsave(&card->lock, flags);
+			val = card->mix.read_mixer(card,i);
+                       spin_unlock_irqrestore(&card->lock, flags);*/
+
+			val = card->mix.mixer_state[i];
+/*			M_printk("returned 0x%x for mixer %d\n",val,i);*/
+
+			break;
+		}
+		return put_user(val, p);
+	}
+	
+        if (_IOC_DIR(cmd) != (_IOC_WRITE|_IOC_READ))
+		return -EINVAL;
+	
+	card->mix.modcnt++;
+
+	if (get_user(val, p))
+		return -EFAULT;
+
+	switch (_IOC_NR(cmd)) {
+	case SOUND_MIXER_RECSRC: /* Arg contains a bit for each recording source */
+
+		if (!card->mix.recmask_io) return -EINVAL;
+		if(!val) return 0;
+		if(! (val &= card->mix.record_sources)) return -EINVAL;
+
+               spin_lock_irqsave(&card->lock, flags);
+		card->mix.recmask_io(card,0,val);
+               spin_unlock_irqrestore(&card->lock, flags);
+		return 0;
+
+	default:
+		i = _IOC_NR(cmd);
+
+		if ( ! supported_mixer(card,i)) 
+			return -EINVAL;
+
+               spin_lock_irqsave(&card->lock, flags);
+		set_mixer(card,i,val);
+               spin_unlock_irqrestore(&card->lock, flags);
+
+		return 0;
+	}
+}
+
+/* --------------------------------------------------------------------- */
+static int ess_open_mixdev(struct inode *inode, struct file *file)
+{
+	unsigned int minor = iminor(inode);
+	struct ess_card *card = NULL;
+	struct pci_dev *pdev = NULL;
+	struct pci_driver *drvr;
+
+	while ((pdev = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, pdev)) != NULL) {
+		drvr = pci_dev_driver (pdev);
+		if (drvr == &maestro_pci_driver) {
+			card = (struct ess_card*)pci_get_drvdata (pdev);
+			if (!card)
+				continue;
+			if (card->dev_mixer == minor)
+				break;
+		}
+	}
+	if (!card)
+		return -ENODEV;
+	file->private_data = card;
+	return nonseekable_open(inode, file);
+}
+
+static int ess_release_mixdev(struct inode *inode, struct file *file)
+{
+	struct ess_card *card = (struct ess_card *)file->private_data;
+
+	VALIDATE_CARD(card);
+	
+	return 0;
+}
+
+static int ess_ioctl_mixdev(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
+{
+	struct ess_card *card = (struct ess_card *)file->private_data;
+
+	VALIDATE_CARD(card);
+
+	return mixer_ioctl(card, cmd, arg);
+}
+
+static /*const*/ struct file_operations ess_mixer_fops = {
+	.owner		= THIS_MODULE,
+	.llseek		= no_llseek,
+	.ioctl		= ess_ioctl_mixdev,
+	.open		= ess_open_mixdev,
+	.release	= ess_release_mixdev,
+};
+
+/* --------------------------------------------------------------------- */
+
+static int drain_dac(struct ess_state *s, int nonblock)
+{
+	DECLARE_WAITQUEUE(wait,current);
+	unsigned long flags;
+	int count;
+	signed long tmo;
+
+	if (s->dma_dac.mapped || !s->dma_dac.ready)
+		return 0;
+	current->state = TASK_INTERRUPTIBLE;
+        add_wait_queue(&s->dma_dac.wait, &wait);
+        for (;;) {
+		/* XXX uhm.. questionable locking*/
+                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) {
+                        remove_wait_queue(&s->dma_dac.wait, &wait);
+			current->state = TASK_RUNNING;
+                        return -EBUSY;
+                }
+		tmo = (count * HZ) / s->ratedac;
+		tmo >>= sample_shift[(s->fmt >> ESS_DAC_SHIFT) & ESS_FMT_MASK];
+		/* XXX this is just broken.  someone is waking us up alot, or schedule_timeout is broken.
+			or something.  who cares. - zach */
+		if (!schedule_timeout(tmo ? tmo : 1) && tmo)
+			M_printk(KERN_DEBUG "maestro: dma timed out?? %ld\n",jiffies);
+        }
+        remove_wait_queue(&s->dma_dac.wait, &wait);
+	current->state = TASK_RUNNING;
+        if (signal_pending(current))
+                return -ERESTARTSYS;
+        return 0;
+}
+
+/* --------------------------------------------------------------------- */
+/* Zach sez: "god this is gross.." */
+static int 
+comb_stereo(unsigned char *real_buffer,unsigned char  *tmp_buffer, int offset, 
+	int count, int bufsize)
+{  
+	/* No such thing as stereo recording, so we
+	use dual input mixers.  which means we have to 
+	combine mono to stereo buffer.  yuck. 
+
+	but we don't have to be able to work a byte at a time..*/
+
+	unsigned char *so,*left,*right;
+	int i;
+
+	so = tmp_buffer;
+	left = real_buffer + offset;
+	right = real_buffer + bufsize/2 + offset;
+
+/*	M_printk("comb_stereo writing %d to %p from %p and %p, offset: %d size: %d\n",count/2, tmp_buffer,left,right,offset,bufsize);*/
+
+	for(i=count/4; i ; i--) {
+		(*(so+2)) = *(right++);
+		(*(so+3)) = *(right++);
+		(*so) = *(left++);
+		(*(so+1)) = *(left++);
+		so+=4;
+	}
+
+	return 0;
+}
+
+/* in this loop, dma_adc.count signifies the amount of data thats waiting
+	to be copied to the user's buffer.  it is filled by the interrupt
+	handler and drained by this loop. */
+static ssize_t 
+ess_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
+{
+	struct ess_state *s = (struct ess_state *)file->private_data;
+	ssize_t ret;
+	unsigned long flags;
+	unsigned swptr;
+	int cnt;
+	unsigned char *combbuf = NULL;
+	
+	VALIDATE_STATE(s);
+	if (s->dma_adc.mapped)
+		return -ENXIO;
+	if (!s->dma_adc.ready && (ret = prog_dmabuf(s, 1)))
+		return ret;
+	if (!access_ok(VERIFY_WRITE, buffer, count))
+		return -EFAULT;
+	if(!(combbuf = kmalloc(count,GFP_KERNEL)))
+		return -ENOMEM;
+	ret = 0;
+
+	calc_bob_rate(s);
+
+	while (count > 0) {
+		spin_lock_irqsave(&s->lock, flags);
+		/* remember, all these things are expressed in bytes to be
+			sent to the user.. hence the evil / 2 down below */
+		swptr = s->dma_adc.swptr;
+		cnt = s->dma_adc.dmasize-swptr;
+		if (s->dma_adc.count < cnt)
+			cnt = s->dma_adc.count;
+		spin_unlock_irqrestore(&s->lock, flags);
+
+		if (cnt > count)
+			cnt = count;
+
+		if ( cnt > 0 ) cnt &= ~3;
+
+		if (cnt <= 0) {
+			start_adc(s);
+			if (file->f_flags & O_NONBLOCK) 
+			{
+				ret = ret ? ret : -EAGAIN;
+				goto rec_return_free;
+			}
+			if (!interruptible_sleep_on_timeout(&s->dma_adc.wait, HZ)) {
+				if(! s->card->in_suspend) printk(KERN_DEBUG "maestro: read: chip lockup? dmasz %u fragsz %u count %i hwptr %u swptr %u\n",
+				       s->dma_adc.dmasize, s->dma_adc.fragsize, s->dma_adc.count, 
+				       s->dma_adc.hwptr, s->dma_adc.swptr);
+				stop_adc(s);
+				spin_lock_irqsave(&s->lock, flags);
+				set_dmac(s, virt_to_bus(s->dma_adc.rawbuf), s->dma_adc.numfrag << s->dma_adc.fragshift);
+				/* program enhanced mode registers */
+				/* FILL ME */
+/*				wrindir(s, SV_CIDMACBASECOUNT1, (s->dma_adc.fragsamples-1) >> 8);
+				wrindir(s, SV_CIDMACBASECOUNT0, s->dma_adc.fragsamples-1); */
+				s->dma_adc.count = s->dma_adc.hwptr = s->dma_adc.swptr = 0;
+				spin_unlock_irqrestore(&s->lock, flags);
+			}
+			if (signal_pending(current)) 
+			{
+				ret = ret ? ret : -ERESTARTSYS;
+				goto rec_return_free;
+			}
+			continue;
+		}
+	
+		if(s->fmt & (ESS_FMT_STEREO << ESS_ADC_SHIFT)) {
+			/* swptr/2 so that we know the real offset in each apu's buffer */
+			comb_stereo(s->dma_adc.rawbuf,combbuf,swptr/2,cnt,s->dma_adc.dmasize);
+			if (copy_to_user(buffer, combbuf, cnt)) {
+				ret = ret ? ret : -EFAULT;
+				goto rec_return_free;
+			}
+		} else  {
+			if (copy_to_user(buffer, s->dma_adc.rawbuf + swptr, cnt)) {
+				ret = ret ? ret : -EFAULT;
+				goto rec_return_free;
+			}
+		}
+
+		swptr = (swptr + cnt) % s->dma_adc.dmasize;
+		spin_lock_irqsave(&s->lock, flags);
+		s->dma_adc.swptr = swptr;
+		s->dma_adc.count -= cnt;
+		spin_unlock_irqrestore(&s->lock, flags);
+		count -= cnt;
+		buffer += cnt;
+		ret += cnt;
+		start_adc(s);
+	}
+
+rec_return_free:
+	if(combbuf) kfree(combbuf);
+	return ret;
+}
+
+static ssize_t 
+ess_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
+{
+	struct ess_state *s = (struct ess_state *)file->private_data;
+	ssize_t ret;
+	unsigned long flags;
+	unsigned swptr;
+	int cnt;
+	
+	VALIDATE_STATE(s);
+	if (s->dma_dac.mapped)
+		return -ENXIO;
+	if (!s->dma_dac.ready && (ret = prog_dmabuf(s, 0)))
+		return ret;
+	if (!access_ok(VERIFY_READ, buffer, count))
+		return -EFAULT;
+	ret = 0;
+
+	calc_bob_rate(s);
+
+	while (count > 0) {
+		spin_lock_irqsave(&s->lock, flags);
+
+		if (s->dma_dac.count < 0) {
+			s->dma_dac.count = 0;
+			s->dma_dac.swptr = s->dma_dac.hwptr;
+		}
+		swptr = s->dma_dac.swptr;
+
+		cnt = s->dma_dac.dmasize-swptr;
+
+		if (s->dma_dac.count + cnt > s->dma_dac.dmasize)
+			cnt = s->dma_dac.dmasize - s->dma_dac.count;
+
+		spin_unlock_irqrestore(&s->lock, flags);
+
+		if (cnt > count)
+			cnt = count;
+
+		if (cnt <= 0) {
+			start_dac(s);
+			if (file->f_flags & O_NONBLOCK) {
+				if(!ret) ret = -EAGAIN;
+				goto return_free;
+			}
+			if (!interruptible_sleep_on_timeout(&s->dma_dac.wait, HZ)) {
+				if(! s->card->in_suspend) printk(KERN_DEBUG "maestro: write: chip lockup? dmasz %u fragsz %u count %i hwptr %u swptr %u\n",
+				       s->dma_dac.dmasize, s->dma_dac.fragsize, s->dma_dac.count, 
+				       s->dma_dac.hwptr, s->dma_dac.swptr);
+				stop_dac(s);
+				spin_lock_irqsave(&s->lock, flags);
+				set_dmaa(s, virt_to_bus(s->dma_dac.rawbuf), s->dma_dac.numfrag << s->dma_dac.fragshift);
+				/* program enhanced mode registers */
+/*				wrindir(s, SV_CIDMAABASECOUNT1, (s->dma_dac.fragsamples-1) >> 8);
+				wrindir(s, SV_CIDMAABASECOUNT0, s->dma_dac.fragsamples-1); */
+				/* FILL ME */
+				s->dma_dac.count = s->dma_dac.hwptr = s->dma_dac.swptr = 0;
+				spin_unlock_irqrestore(&s->lock, flags);
+			}
+			if (signal_pending(current)) {
+				if (!ret) ret = -ERESTARTSYS;
+				goto return_free;
+			}
+			continue;
+		}
+		if (copy_from_user(s->dma_dac.rawbuf + swptr, buffer, cnt)) {
+			if (!ret) ret = -EFAULT;
+			goto return_free;
+		}
+/*		printk("wrote %d bytes at sw: %d cnt: %d while hw: %d\n",cnt, swptr, s->dma_dac.count, s->dma_dac.hwptr);*/
+
+		swptr = (swptr + cnt) % s->dma_dac.dmasize;
+
+		spin_lock_irqsave(&s->lock, flags);
+		s->dma_dac.swptr = swptr;
+		s->dma_dac.count += cnt;
+		s->dma_dac.endcleared = 0;
+		spin_unlock_irqrestore(&s->lock, flags);
+		count -= cnt;
+		buffer += cnt;
+		ret += cnt;
+		start_dac(s);
+	}
+return_free:
+	return ret;
+}
+
+/* No kernel lock - we have our own spinlock */
+static unsigned int ess_poll(struct file *file, struct poll_table_struct *wait)
+{
+	struct ess_state *s = (struct ess_state *)file->private_data;
+	unsigned long flags;
+	unsigned int mask = 0;
+
+	VALIDATE_STATE(s);
+
+/* In 0.14 prog_dmabuf always returns success anyway ... */
+	if (file->f_mode & FMODE_WRITE) {
+		if (!s->dma_dac.ready && prog_dmabuf(s, 0)) 
+			return 0;
+	}
+	if (file->f_mode & FMODE_READ) {
+	  	if (!s->dma_adc.ready && prog_dmabuf(s, 1))
+			return 0;
+	}
+
+	if (file->f_mode & FMODE_WRITE)
+		poll_wait(file, &s->dma_dac.wait, wait);
+	if (file->f_mode & FMODE_READ)
+		poll_wait(file, &s->dma_adc.wait, wait);
+	spin_lock_irqsave(&s->lock, flags);
+	ess_update_ptr(s);
+	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 ess_mmap(struct file *file, struct vm_area_struct *vma)
+{
+	struct ess_state *s = (struct ess_state *)file->private_data;
+	struct dmabuf *db;
+	int ret = -EINVAL;
+	unsigned long size;
+
+	VALIDATE_STATE(s);
+	lock_kernel();
+	if (vma->vm_flags & VM_WRITE) {
+		if ((ret = prog_dmabuf(s, 1)) != 0)
+			goto out;
+		db = &s->dma_dac;
+	} else 
+#if 0
+	/* if we can have the wp/wc do the combining
+		we can turn this back on.  */
+	      if (vma->vm_flags & VM_READ) {
+		if ((ret = prog_dmabuf(s, 0)) != 0)
+			goto out;
+		db = &s->dma_adc;
+	} else  
+#endif
+		goto out;
+	ret = -EINVAL;
+	if (vma->vm_pgoff != 0)
+		goto out;
+	size = vma->vm_end - vma->vm_start;
+	if (size > (PAGE_SIZE << db->buforder))
+		goto out;
+	ret = -EAGAIN;
+	if (remap_pfn_range(vma, vma->vm_start,
+			virt_to_phys(db->rawbuf) >> PAGE_SHIFT,
+			size, vma->vm_page_prot))
+		goto out;
+	db->mapped = 1;
+	ret = 0;
+out:
+	unlock_kernel();
+	return ret;
+}
+
+static int ess_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
+{
+	struct ess_state *s = (struct ess_state *)file->private_data;
+	unsigned long flags;
+        audio_buf_info abinfo;
+        count_info cinfo;
+	int val, mapped, ret;
+	unsigned char fmtm, fmtd;
+	void __user *argp = (void __user *)arg;
+	int __user *p = argp;
+
+/*	printk("maestro: ess_ioctl: cmd %d\n", cmd);*/
+	
+	VALIDATE_STATE(s);
+        mapped = ((file->f_mode & FMODE_WRITE) && s->dma_dac.mapped) ||
+		((file->f_mode & FMODE_READ) && s->dma_adc.mapped);
+	switch (cmd) {
+	case OSS_GETVERSION:
+		return put_user(SOUND_VERSION, p);
+
+	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:
+		/* XXX fix */
+		return 0;
+
+	case SNDCTL_DSP_GETCAPS:
+		return put_user(DSP_CAP_DUPLEX | DSP_CAP_REALTIME | DSP_CAP_TRIGGER | DSP_CAP_MMAP, p);
+		
+        case SNDCTL_DSP_RESET:
+		if (file->f_mode & FMODE_WRITE) {
+			stop_dac(s);
+			synchronize_irq(s->card->pcidev->irq);
+			s->dma_dac.swptr = s->dma_dac.hwptr = s->dma_dac.count = s->dma_dac.total_bytes = 0;
+		}
+		if (file->f_mode & FMODE_READ) {
+			stop_adc(s);
+			synchronize_irq(s->card->pcidev->irq);
+			s->dma_adc.swptr = s->dma_adc.hwptr = s->dma_adc.count = s->dma_adc.total_bytes = 0;
+		}
+		return 0;
+
+        case SNDCTL_DSP_SPEED:
+                if (get_user(val, p))
+			return -EFAULT;
+		if (val >= 0) {
+			if (file->f_mode & FMODE_READ) {
+				stop_adc(s);
+				s->dma_adc.ready = 0;
+				set_adc_rate(s, val);
+			}
+			if (file->f_mode & FMODE_WRITE) {
+				stop_dac(s);
+				s->dma_dac.ready = 0;
+				set_dac_rate(s, val);
+			}
+		}
+		return put_user((file->f_mode & FMODE_READ) ? s->rateadc : s->ratedac, p);
+		
+        case SNDCTL_DSP_STEREO:
+		if (get_user(val, p))
+			return -EFAULT;
+		fmtd = 0;
+		fmtm = ~0;
+		if (file->f_mode & FMODE_READ) {
+			stop_adc(s);
+			s->dma_adc.ready = 0;
+			if (val)
+				fmtd |= ESS_FMT_STEREO << ESS_ADC_SHIFT;
+			else
+				fmtm &= ~(ESS_FMT_STEREO << ESS_ADC_SHIFT);
+		}
+		if (file->f_mode & FMODE_WRITE) {
+			stop_dac(s);
+			s->dma_dac.ready = 0;
+			if (val)
+				fmtd |= ESS_FMT_STEREO << ESS_DAC_SHIFT;
+			else
+				fmtm &= ~(ESS_FMT_STEREO << ESS_DAC_SHIFT);
+		}
+		set_fmt(s, fmtm, fmtd);
+		return 0;
+
+        case SNDCTL_DSP_CHANNELS:
+                if (get_user(val, p))
+			return -EFAULT;
+		if (val != 0) {
+			fmtd = 0;
+			fmtm = ~0;
+			if (file->f_mode & FMODE_READ) {
+				stop_adc(s);
+				s->dma_adc.ready = 0;
+				if (val >= 2)
+					fmtd |= ESS_FMT_STEREO << ESS_ADC_SHIFT;
+				else
+					fmtm &= ~(ESS_FMT_STEREO << ESS_ADC_SHIFT);
+			}
+			if (file->f_mode & FMODE_WRITE) {
+				stop_dac(s);
+				s->dma_dac.ready = 0;
+				if (val >= 2)
+					fmtd |= ESS_FMT_STEREO << ESS_DAC_SHIFT;
+				else
+					fmtm &= ~(ESS_FMT_STEREO << ESS_DAC_SHIFT);
+			}
+			set_fmt(s, fmtm, fmtd);
+		}
+		return put_user((s->fmt & ((file->f_mode & FMODE_READ) ? (ESS_FMT_STEREO << ESS_ADC_SHIFT) 
+					   : (ESS_FMT_STEREO << ESS_DAC_SHIFT))) ? 2 : 1, p);
+		
+	case SNDCTL_DSP_GETFMTS: /* Returns a mask */
+                return put_user(AFMT_U8|AFMT_S16_LE, p);
+		
+	case SNDCTL_DSP_SETFMT: /* Selects ONE fmt*/
+		if (get_user(val, p))
+			return -EFAULT;
+		if (val != AFMT_QUERY) {
+			fmtd = 0;
+			fmtm = ~0;
+			if (file->f_mode & FMODE_READ) {
+				stop_adc(s);
+				s->dma_adc.ready = 0;
+	/* fixed at 16bit for now */
+				fmtd |= ESS_FMT_16BIT << ESS_ADC_SHIFT;
+#if 0
+				if (val == AFMT_S16_LE)
+					fmtd |= ESS_FMT_16BIT << ESS_ADC_SHIFT;
+				else
+					fmtm &= ~(ESS_FMT_16BIT << ESS_ADC_SHIFT);
+#endif
+			}
+			if (file->f_mode & FMODE_WRITE) {
+				stop_dac(s);
+				s->dma_dac.ready = 0;
+				if (val == AFMT_S16_LE)
+					fmtd |= ESS_FMT_16BIT << ESS_DAC_SHIFT;
+				else
+					fmtm &= ~(ESS_FMT_16BIT << ESS_DAC_SHIFT);
+			}
+			set_fmt(s, fmtm, fmtd);
+		}
+ 		return put_user((s->fmt & ((file->f_mode & FMODE_READ) ? 
+			(ESS_FMT_16BIT << ESS_ADC_SHIFT) 
+			: (ESS_FMT_16BIT << ESS_DAC_SHIFT))) ? 
+				AFMT_S16_LE : 
+				AFMT_U8, 
+			p);
+		
+	case SNDCTL_DSP_POST:
+                return 0;
+
+        case SNDCTL_DSP_GETTRIGGER:
+		val = 0;
+		if ((file->f_mode & FMODE_READ) && (s->enable & ADC_RUNNING))
+			val |= PCM_ENABLE_INPUT;
+		if ((file->f_mode & FMODE_WRITE) && (s->enable & DAC_RUNNING)) 
+			val |= PCM_ENABLE_OUTPUT;
+		return put_user(val, p);
+		
+	case SNDCTL_DSP_SETTRIGGER:
+		if (get_user(val, p))
+			return -EFAULT;
+		if (file->f_mode & FMODE_READ) {
+			if (val & PCM_ENABLE_INPUT) {
+				if (!s->dma_adc.ready && (ret =  prog_dmabuf(s, 1)))
+					return ret;
+				start_adc(s);
+			} else
+				stop_adc(s);
+		}
+		if (file->f_mode & FMODE_WRITE) {
+			if (val & PCM_ENABLE_OUTPUT) {
+				if (!s->dma_dac.ready && (ret = prog_dmabuf(s, 0)))
+					return ret;
+				start_dac(s);
+			} else
+				stop_dac(s);
+		}
+		return 0;
+
+	case SNDCTL_DSP_GETOSPACE:
+		if (!(file->f_mode & FMODE_WRITE))
+			return -EINVAL;
+		if (!s->dma_dac.ready && (ret = prog_dmabuf(s, 0)))
+			return ret;
+		spin_lock_irqsave(&s->lock, flags);
+		ess_update_ptr(s);
+		abinfo.fragsize = s->dma_dac.fragsize;
+                abinfo.bytes = s->dma_dac.dmasize - s->dma_dac.count;
+                abinfo.fragstotal = s->dma_dac.numfrag;
+                abinfo.fragments = abinfo.bytes >> s->dma_dac.fragshift;      
+		spin_unlock_irqrestore(&s->lock, flags);
+		return copy_to_user(argp, &abinfo, sizeof(abinfo)) ? -EFAULT : 0;
+
+	case SNDCTL_DSP_GETISPACE:
+		if (!(file->f_mode & FMODE_READ))
+			return -EINVAL;
+		if (!s->dma_adc.ready && (ret =  prog_dmabuf(s, 1)))
+			return ret;
+		spin_lock_irqsave(&s->lock, flags);
+		ess_update_ptr(s);
+		abinfo.fragsize = s->dma_adc.fragsize;
+                abinfo.bytes = s->dma_adc.count;
+                abinfo.fragstotal = s->dma_adc.numfrag;
+                abinfo.fragments = abinfo.bytes >> s->dma_adc.fragshift;      
+		spin_unlock_irqrestore(&s->lock, flags);
+		return copy_to_user(argp, &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;
+		if (!s->dma_dac.ready && (ret = prog_dmabuf(s, 0)))
+			return ret;
+		spin_lock_irqsave(&s->lock, flags);
+		ess_update_ptr(s);
+                val = s->dma_dac.count;
+		spin_unlock_irqrestore(&s->lock, flags);
+		return put_user(val, p);
+
+        case SNDCTL_DSP_GETIPTR:
+		if (!(file->f_mode & FMODE_READ))
+			return -EINVAL;
+		if (!s->dma_adc.ready && (ret =  prog_dmabuf(s, 1)))
+			return ret;
+		spin_lock_irqsave(&s->lock, flags);
+		ess_update_ptr(s);
+                cinfo.bytes = s->dma_adc.total_bytes;
+                cinfo.blocks = s->dma_adc.count >> s->dma_adc.fragshift;
+                cinfo.ptr = s->dma_adc.hwptr;
+		if (s->dma_adc.mapped)
+			s->dma_adc.count &= s->dma_adc.fragsize-1;
+		spin_unlock_irqrestore(&s->lock, flags);
+		if (copy_to_user(argp, &cinfo, sizeof(cinfo)))
+			return -EFAULT;
+		return 0;
+
+        case SNDCTL_DSP_GETOPTR:
+		if (!(file->f_mode & FMODE_WRITE))
+			return -EINVAL;
+		if (!s->dma_dac.ready && (ret = prog_dmabuf(s, 0)))
+			return ret;
+		spin_lock_irqsave(&s->lock, flags);
+		ess_update_ptr(s);
+                cinfo.bytes = s->dma_dac.total_bytes;
+                cinfo.blocks = s->dma_dac.count >> s->dma_dac.fragshift;
+                cinfo.ptr = s->dma_dac.hwptr;
+		if (s->dma_dac.mapped)
+			s->dma_dac.count &= s->dma_dac.fragsize-1;
+		spin_unlock_irqrestore(&s->lock, flags);
+		if (copy_to_user(argp, &cinfo, sizeof(cinfo)))
+			return -EFAULT;
+		return 0;
+
+        case SNDCTL_DSP_GETBLKSIZE:
+		if (file->f_mode & FMODE_WRITE) {
+			if ((val = prog_dmabuf(s, 0)))
+				return val;
+			return put_user(s->dma_dac.fragsize, p);
+		}
+		if ((val = prog_dmabuf(s, 1)))
+			return val;
+		return put_user(s->dma_adc.fragsize, p);
+
+        case SNDCTL_DSP_SETFRAGMENT:
+                if (get_user(val, p))
+			return -EFAULT;
+		M_printk("maestro: SETFRAGMENT: %0x\n",val);
+		if (file->f_mode & FMODE_READ) {
+			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 (file->f_mode & FMODE_WRITE) {
+			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;
+		}
+		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, p))
+			return -EFAULT;
+		if (val != 1 && val != 2 && val != 4)
+			return -EINVAL;
+		if (file->f_mode & FMODE_READ)
+			s->dma_adc.subdivision = val;
+		if (file->f_mode & FMODE_WRITE)
+			s->dma_dac.subdivision = val;
+		return 0;
+
+        case SOUND_PCM_READ_RATE:
+		return put_user((file->f_mode & FMODE_READ) ? s->rateadc : s->ratedac, p);
+
+        case SOUND_PCM_READ_CHANNELS:
+		return put_user((s->fmt & ((file->f_mode & FMODE_READ) ? (ESS_FMT_STEREO << ESS_ADC_SHIFT) 
+					   : (ESS_FMT_STEREO << ESS_DAC_SHIFT))) ? 2 : 1, p);
+
+        case SOUND_PCM_READ_BITS:
+		return put_user((s->fmt & ((file->f_mode & FMODE_READ) ? (ESS_FMT_16BIT << ESS_ADC_SHIFT) 
+					   : (ESS_FMT_16BIT << ESS_DAC_SHIFT))) ? 16 : 8, p);
+
+        case SOUND_PCM_WRITE_FILTER:
+        case SNDCTL_DSP_SETSYNCRO:
+        case SOUND_PCM_READ_FILTER:
+                return -EINVAL;
+		
+	}
+	return -EINVAL;
+}
+
+static void
+set_base_registers(struct ess_state *s,void *vaddr)
+{
+	unsigned long packed_phys = virt_to_bus(vaddr)>>12;
+	wave_set_register(s, 0x01FC , packed_phys);
+	wave_set_register(s, 0x01FD , packed_phys);
+	wave_set_register(s, 0x01FE , packed_phys);
+	wave_set_register(s, 0x01FF , packed_phys);
+}
+
+/* 
+ * this guy makes sure we're in the right power
+ * state for what we want to be doing 
+ */
+static void maestro_power(struct ess_card *card, int tostate)
+{
+	u16 active_mask = acpi_state_mask[tostate];
+	u8 state;
+
+	if(!use_pm) return;
+
+	pci_read_config_byte(card->pcidev, card->power_regs+0x4, &state);
+	state&=3;
+
+	/* make sure we're in the right state */
+	if(state != tostate) {
+		M_printk(KERN_WARNING "maestro: dev %02x:%02x.%x switching from D%d to D%d\n",
+			card->pcidev->bus->number, 
+			PCI_SLOT(card->pcidev->devfn),
+			PCI_FUNC(card->pcidev->devfn),
+			state,tostate);
+		pci_write_config_byte(card->pcidev, card->power_regs+0x4, tostate);
+	}
+
+	/* and make sure the units we care about are on 
+		XXX we might want to do this before state flipping? */
+	pci_write_config_word(card->pcidev, 0x54, ~ active_mask);
+	pci_write_config_word(card->pcidev, 0x56, ~ active_mask);
+}
+
+/* we allocate a large power of two for all our memory.
+	this is cut up into (not to scale :):
+	|silly fifo word	| 512byte mixbuf per adc	| dac/adc * channels |
+*/
+static int
+allocate_buffers(struct ess_state *s)
+{
+	void *rawbuf=NULL;
+	int order,i;
+	struct page *page, *pend;
+
+	/* alloc as big a chunk as we can */
+	for (order = (dsps_order + (16-PAGE_SHIFT) + 1); order >= (dsps_order + 2 + 1); order--)
+		if((rawbuf = (void *)__get_free_pages(GFP_KERNEL|GFP_DMA, order)))
+			break;
+
+	if (!rawbuf)
+		return 1;
+
+	M_printk("maestro: allocated %ld (%d) bytes at %p\n",PAGE_SIZE<<order,order, rawbuf);
+
+	if ((virt_to_bus(rawbuf) + (PAGE_SIZE << order) - 1) & ~((1<<28)-1))  {
+		printk(KERN_ERR "maestro: DMA buffer beyond 256MB! busaddr 0x%lx  size %ld\n",
+			virt_to_bus(rawbuf), PAGE_SIZE << order);
+		kfree(rawbuf);
+		return 1;
+	}
+
+	s->card->dmapages = rawbuf;
+	s->card->dmaorder = order;
+
+	for(i=0;i<NR_DSPS;i++) {
+		struct ess_state *ess = &s->card->channels[i];
+
+		if(ess->dev_audio == -1)
+			continue;
+
+		ess->dma_dac.ready = s->dma_dac.mapped = 0;
+		ess->dma_adc.ready = s->dma_adc.mapped = 0;
+		ess->dma_adc.buforder = ess->dma_dac.buforder = order - 1 - dsps_order - 1;
+
+		/* offset dac and adc buffers starting half way through and then at each [da][ad]c's
+			order's intervals.. */
+		ess->dma_dac.rawbuf = rawbuf + (PAGE_SIZE<<(order-1)) + (i * ( PAGE_SIZE << (ess->dma_dac.buforder + 1 )));
+		ess->dma_adc.rawbuf = ess->dma_dac.rawbuf + ( PAGE_SIZE << ess->dma_dac.buforder);
+		/* offset mixbuf by a mixbuf so that the lame status fifo can
+			happily scribble away.. */ 
+		ess->mixbuf = rawbuf + (512 * (i+1));
+
+		M_printk("maestro: setup apu %d: dac: %p adc: %p mix: %p\n",i,ess->dma_dac.rawbuf,
+			ess->dma_adc.rawbuf, ess->mixbuf);
+
+	}
+
+	/* now mark the pages as reserved; otherwise remap_pfn_range doesn't do what we want */
+	pend = virt_to_page(rawbuf + (PAGE_SIZE << order) - 1);
+	for (page = virt_to_page(rawbuf); page <= pend; page++)
+		SetPageReserved(page);
+
+	return 0;
+} 
+static void
+free_buffers(struct ess_state *s)
+{
+	struct page *page, *pend;
+
+	s->dma_dac.rawbuf = s->dma_adc.rawbuf = NULL;
+	s->dma_dac.mapped = s->dma_adc.mapped = 0;
+	s->dma_dac.ready = s->dma_adc.ready = 0;
+
+	M_printk("maestro: freeing %p\n",s->card->dmapages);
+	/* undo marking the pages as reserved */
+
+	pend = virt_to_page(s->card->dmapages + (PAGE_SIZE << s->card->dmaorder) - 1);
+	for (page = virt_to_page(s->card->dmapages); page <= pend; page++)
+		ClearPageReserved(page);
+
+	free_pages((unsigned long)s->card->dmapages,s->card->dmaorder);
+	s->card->dmapages = NULL;
+}
+
+static int 
+ess_open(struct inode *inode, struct file *file)
+{
+	unsigned int minor = iminor(inode);
+	struct ess_state *s = NULL;
+	unsigned char fmtm = ~0, fmts = 0;
+	struct pci_dev *pdev = NULL;
+	/*
+	 *	Scan the cards and find the channel. We only
+	 *	do this at open time so it is ok
+	 */
+
+	while ((pdev = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, pdev)) != NULL) {
+		struct ess_card *c;
+		struct pci_driver *drvr;
+
+		drvr = pci_dev_driver (pdev);
+		if (drvr == &maestro_pci_driver) {
+			int i;
+			struct ess_state *sp;
+
+			c = (struct ess_card*)pci_get_drvdata (pdev);
+			if (!c)
+				continue;
+			for(i=0;i<NR_DSPS;i++)
+			{
+				sp=&c->channels[i];
+				if(sp->dev_audio < 0)
+					continue;
+				if((sp->dev_audio ^ minor) & ~0xf)
+					continue;
+				s=sp;
+			}
+		}
+	}
+	if (!s)
+		return -ENODEV;
+
+       	VALIDATE_STATE(s);
+	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 -EWOULDBLOCK;
+		}
+		up(&s->open_sem);
+		interruptible_sleep_on(&s->open_wait);
+		if (signal_pending(current))
+			return -ERESTARTSYS;
+		down(&s->open_sem);
+	}
+
+	/* under semaphore.. */
+	if ((s->card->dmapages==NULL) && allocate_buffers(s)) {
+		up(&s->open_sem);
+		return -ENOMEM;
+	}
+
+	/* we're covered by the open_sem */
+	if( ! s->card->dsps_open )  {
+		maestro_power(s->card,ACPI_D0);
+		start_bob(s);
+	}
+	s->card->dsps_open++;
+	M_printk("maestro: open, %d bobs now\n",s->card->dsps_open);
+
+	/* ok, lets write WC base regs now that we've 
+		powered up the chip */
+	M_printk("maestro: writing 0x%lx (bus 0x%lx) to the wp\n",virt_to_bus(s->card->dmapages),
+		((virt_to_bus(s->card->dmapages))&0xFFE00000)>>12);
+	set_base_registers(s,s->card->dmapages);
+
+	if (file->f_mode & FMODE_READ) {
+/*
+		fmtm &= ~((ESS_FMT_STEREO | ESS_FMT_16BIT) << ESS_ADC_SHIFT);
+		if ((minor & 0xf) == SND_DEV_DSP16)
+			fmts |= ESS_FMT_16BIT << ESS_ADC_SHIFT; */
+
+		fmtm &= ~((ESS_FMT_STEREO|ESS_FMT_16BIT) << ESS_ADC_SHIFT);
+		fmts = (ESS_FMT_STEREO|ESS_FMT_16BIT) << ESS_ADC_SHIFT;
+
+		s->dma_adc.ossfragshift = s->dma_adc.ossmaxfrags = s->dma_adc.subdivision = 0;
+		set_adc_rate(s, 8000);
+	}
+	if (file->f_mode & FMODE_WRITE) {
+		fmtm &= ~((ESS_FMT_STEREO | ESS_FMT_16BIT) << ESS_DAC_SHIFT);
+		if ((minor & 0xf) == SND_DEV_DSP16)
+			fmts |= ESS_FMT_16BIT << ESS_DAC_SHIFT;
+
+		s->dma_dac.ossfragshift = s->dma_dac.ossmaxfrags = s->dma_dac.subdivision = 0;
+		set_dac_rate(s, 8000);
+	}
+	set_fmt(s, fmtm, fmts);
+	s->open_mode |= file->f_mode & (FMODE_READ | FMODE_WRITE);
+
+	up(&s->open_sem);
+	return nonseekable_open(inode, file);
+}
+
+static int 
+ess_release(struct inode *inode, struct file *file)
+{
+	struct ess_state *s = (struct ess_state *)file->private_data;
+
+	VALIDATE_STATE(s);
+	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);
+	}
+	if (file->f_mode & FMODE_READ) {
+		stop_adc(s);
+	}
+		
+	s->open_mode &= (~file->f_mode) & (FMODE_READ|FMODE_WRITE);
+	/* we're covered by the open_sem */
+	M_printk("maestro: %d dsps now alive\n",s->card->dsps_open-1);
+	if( --s->card->dsps_open <= 0) {
+		s->card->dsps_open = 0;
+		stop_bob(s);
+		free_buffers(s);
+		maestro_power(s->card,ACPI_D2);
+	}
+	up(&s->open_sem);
+	wake_up(&s->open_wait);
+	unlock_kernel();
+	return 0;
+}
+
+static struct file_operations ess_audio_fops = {
+	.owner		= THIS_MODULE,
+	.llseek		= no_llseek,
+	.read		= ess_read,
+	.write		= ess_write,
+	.poll		= ess_poll,
+	.ioctl		= ess_ioctl,
+	.mmap		= ess_mmap,
+	.open		= ess_open,
+	.release	= ess_release,
+};
+
+static int
+maestro_config(struct ess_card *card) 
+{
+	struct pci_dev *pcidev = card->pcidev;
+	struct ess_state *ess = &card->channels[0];
+	int apu,iobase  = card->iobase;
+	u16 w;
+	u32 n;
+
+	/* We used to muck around with pci config space that
+	 * we had no business messing with.  We don't know enough
+	 * about the machine to know which DMA mode is appropriate, 
+	 * etc.  We were guessing wrong on some machines and making
+	 * them unhappy.  We now trust in the BIOS to do things right,
+	 * which almost certainly means a new host of problems will
+	 * arise with broken BIOS implementations.  screw 'em. 
+	 * We're already intolerant of machines that don't assign
+	 * IRQs.
+	 */
+	
+	/* do config work at full power */
+	maestro_power(card,ACPI_D0);
+	 
+	pci_read_config_word(pcidev, 0x50, &w);
+
+	w&=~(1<<5);			/* Don't swap left/right (undoc)*/
+	
+	pci_write_config_word(pcidev, 0x50, w);
+	
+	pci_read_config_word(pcidev, 0x52, &w);
+	w&=~(1<<15);		/* Turn off internal clock multiplier */
+	/* XXX how do we know which to use? */
+	w&=~(1<<14);		/* External clock */
+	
+	w|= (1<<7);		/* Hardware volume control on */
+	w|= (1<<6);		/* Debounce off: easier to push the HWV buttons. */
+	w&=~(1<<5);		/* GPIO 4:5 */
+	w|= (1<<4);             /* Disconnect from the CHI.  Enabling this made a dell 7500 work. */
+	w&=~(1<<2);		/* MIDI fix off (undoc) */
+	w&=~(1<<1);		/* reserved, always write 0 */
+	pci_write_config_word(pcidev, 0x52, w);
+	
+	/*
+	 *	Legacy mode
+	 */
+
+	pci_read_config_word(pcidev, 0x40, &w);
+	w|=(1<<15);	/* legacy decode off */
+	w&=~(1<<14);	/* Disable SIRQ */
+	w&=~(0x1f);	/* disable mpu irq/io, game port, fm, SB */
+	 
+	pci_write_config_word(pcidev, 0x40, w);
+
+	/* Set up 978 docking control chip. */
+	pci_read_config_word(pcidev, 0x58, &w);
+	w|=1<<2;	/* Enable 978. */
+	w|=1<<3;	/* Turn on 978 hardware volume control. */
+	w&=~(1<<11);	/* Turn on 978 mixer volume control. */
+	pci_write_config_word(pcidev, 0x58, w);
+	
+	sound_reset(iobase);
+
+	/*
+	 *	Ring Bus Setup
+	 */
+
+	/* setup usual 0x34 stuff.. 0x36 may be chip specific */
+        outw(0xC090, iobase+0x34); /* direct sound, stereo */
+        udelay(20);
+        outw(0x3000, iobase+0x36); /* direct sound, stereo */
+        udelay(20);
+
+
+	/*
+	 *	Reset the CODEC
+	 */
+	 
+	maestro_ac97_reset(iobase,pcidev);
+	
+	/*
+	 *	Ring Bus Setup
+	 */
+	 	 
+	n=inl(iobase+0x34);
+	n&=~0xF000;
+	n|=12<<12;		/* Direct Sound, Stereo */
+	outl(n, iobase+0x34);
+
+	n=inl(iobase+0x34);
+	n&=~0x0F00;		/* Modem off */
+	outl(n, iobase+0x34);
+
+	n=inl(iobase+0x34);
+	n&=~0x00F0;
+	n|=9<<4;		/* DAC, Stereo */
+	outl(n, iobase+0x34);
+	
+	n=inl(iobase+0x34);
+	n&=~0x000F;		/* ASSP off */
+	outl(n, iobase+0x34);
+	
+	n=inl(iobase+0x34);
+	n|=(1<<29);		/* Enable ring bus */
+	outl(n, iobase+0x34);
+	
+	n=inl(iobase+0x34);
+	n|=(1<<28);		/* Enable serial bus */
+	outl(n, iobase+0x34);
+	
+	n=inl(iobase+0x34);
+	n&=~0x00F00000;		/* MIC off */
+	outl(n, iobase+0x34);
+	
+	n=inl(iobase+0x34);
+	n&=~0x000F0000;		/* I2S off */
+	outl(n, iobase+0x34);
+	
+
+	w=inw(iobase+0x18);
+	w&=~(1<<7);		/* ClkRun off */
+	outw(w, iobase+0x18);
+
+	w=inw(iobase+0x18);
+	w&=~(1<<6);		/* Hardware volume control interrupt off... for now. */
+	outw(w, iobase+0x18);
+	
+	w=inw(iobase+0x18);
+	w&=~(1<<4);		/* ASSP irq off */
+	outw(w, iobase+0x18);
+	
+	w=inw(iobase+0x18);
+	w&=~(1<<3);		/* ISDN irq off */
+	outw(w, iobase+0x18);
+	
+	w=inw(iobase+0x18);
+	w|=(1<<2);		/* Direct Sound IRQ on */
+	outw(w, iobase+0x18);
+
+	w=inw(iobase+0x18);
+	w&=~(1<<1);		/* MPU401 IRQ off */
+	outw(w, iobase+0x18);
+
+	w=inw(iobase+0x18);
+	w|=(1<<0);		/* SB IRQ on */
+	outw(w, iobase+0x18);
+
+	/* Set hardware volume control registers to midpoints.
+	   We can tell which button was pushed based on how they change. */
+	outb(0x88, iobase+0x1c);
+	outb(0x88, iobase+0x1d);
+	outb(0x88, iobase+0x1e);
+	outb(0x88, iobase+0x1f);
+
+	/* it appears some maestros (dell 7500) only work if these are set,
+		regardless of whether we use the assp or not. */
+
+	outb(0, iobase+0xA4); 
+	outb(3, iobase+0xA2); 
+	outb(0, iobase+0xA6);
+	
+	for(apu=0;apu<16;apu++)
+	{
+		/* Write 0 into the buffer area 0x1E0->1EF */
+		outw(0x01E0+apu, 0x10+iobase);
+		outw(0x0000, 0x12+iobase);
+	
+		/*
+		 * The 1.10 test program seem to write 0 into the buffer area
+		 * 0x1D0-0x1DF too.
+		 */
+		outw(0x01D0+apu, 0x10+iobase);
+		outw(0x0000, 0x12+iobase);
+	}
+
+#if 1
+	wave_set_register(ess, IDR7_WAVE_ROMRAM, 
+		(wave_get_register(ess, IDR7_WAVE_ROMRAM)&0xFF00));
+	wave_set_register(ess, IDR7_WAVE_ROMRAM,
+		wave_get_register(ess, IDR7_WAVE_ROMRAM)|0x100);
+	wave_set_register(ess, IDR7_WAVE_ROMRAM,
+		wave_get_register(ess, IDR7_WAVE_ROMRAM)&~0x200);
+	wave_set_register(ess, IDR7_WAVE_ROMRAM,
+		wave_get_register(ess, IDR7_WAVE_ROMRAM)|~0x400);
+#else		
+	maestro_write(ess, IDR7_WAVE_ROMRAM, 
+		(maestro_read(ess, IDR7_WAVE_ROMRAM)&0xFF00));
+	maestro_write(ess, IDR7_WAVE_ROMRAM,
+		maestro_read(ess, IDR7_WAVE_ROMRAM)|0x100);
+	maestro_write(ess, IDR7_WAVE_ROMRAM,
+		maestro_read(ess, IDR7_WAVE_ROMRAM)&~0x200);
+	maestro_write(ess, IDR7_WAVE_ROMRAM,
+		maestro_read(ess, IDR7_WAVE_ROMRAM)|0x400);
+#endif
+	
+	maestro_write(ess, IDR2_CRAM_DATA, 0x0000);
+	maestro_write(ess, 0x08, 0xB004);
+	/* Now back to the DirectSound stuff */
+	maestro_write(ess, 0x09, 0x001B);
+	maestro_write(ess, 0x0A, 0x8000);
+	maestro_write(ess, 0x0B, 0x3F37);
+	maestro_write(ess, 0x0C, 0x0098);
+	
+	/* parallel out ?? */
+	maestro_write(ess, 0x0C, 
+		(maestro_read(ess, 0x0C)&~0xF000)|0x8000); 
+	/* parallel in, has something to do with recording :) */
+	maestro_write(ess, 0x0C, 
+		(maestro_read(ess, 0x0C)&~0x0F00)|0x0500);
+
+	maestro_write(ess, 0x0D, 0x7632);
+			
+	/* Wave cache control on - test off, sg off, 
+		enable, enable extra chans 1Mb */
+
+	outw(inw(0x14+iobase)|(1<<8),0x14+iobase);
+	outw(inw(0x14+iobase)&0xFE03,0x14+iobase);
+	outw((inw(0x14+iobase)&0xFFFC), 0x14+iobase);
+	outw(inw(0x14+iobase)|(1<<7),0x14+iobase);
+
+	outw(0xA1A0, 0x14+iobase);      /* 0300 ? */
+
+	/* Now clear the APU control ram */	
+	for(apu=0;apu<NR_APUS;apu++)
+	{
+		for(w=0;w<NR_APU_REGS;w++)
+			apu_set_register(ess, apu|ESS_CHAN_HARD, w, 0);
+		
+	}
+
+	return 0;
+	
+}
+
+/* this guy tries to find the pci power management
+ * register bank.  this should really be in core
+ * code somewhere.  1 on success. */
+static int
+parse_power(struct ess_card *card, struct pci_dev *pcidev)
+{
+	u32 n;
+	u16 w;
+	u8 next;
+	int max = 64;  /* an a 8bit guy pointing to 32bit guys
+				can only express so much. */
+
+	card->power_regs = 0;
+
+	/* check to see if we have a capabilities list in
+		the config register */
+	pci_read_config_word(pcidev, PCI_STATUS, &w);
+	if(!(w & PCI_STATUS_CAP_LIST)) return 0;
+
+	/* walk the list, starting at the head. */
+	pci_read_config_byte(pcidev,PCI_CAPABILITY_LIST,&next);
+
+	while(next && max--) {
+		pci_read_config_dword(pcidev, next & ~3, &n);
+		if((n & 0xff) == PCI_CAP_ID_PM) {
+			card->power_regs = next;
+			break;
+		}
+		next = ((n>>8) & 0xff);
+	}
+
+	return card->power_regs ? 1 : 0;
+}
+
+static int __init
+maestro_probe(struct pci_dev *pcidev,const struct pci_device_id *pdid)
+{
+	int card_type = pdid->driver_data;
+	u32 n;
+	int iobase;
+	int i, ret;
+	struct ess_card *card;
+	struct ess_state *ess;
+	struct pm_dev *pmdev;
+	int num = 0;
+
+/* when built into the kernel, we only print version if device is found */
+#ifndef MODULE
+	static int printed_version;
+	if (!printed_version++)
+		printk(version);
+#endif
+
+	/* don't pick up weird modem maestros */
+	if(((pcidev->class >> 8) & 0xffff) != PCI_CLASS_MULTIMEDIA_AUDIO)
+		return -ENODEV;
+
+
+	if ((ret=pci_enable_device(pcidev)))
+		return ret;
+			
+	iobase = pci_resource_start(pcidev,0);
+	if (!iobase || !(pci_resource_flags(pcidev, 0 ) & IORESOURCE_IO))
+		return -ENODEV;
+
+	if(pcidev->irq == 0)
+		return -ENODEV;
+
+	/* stake our claim on the iospace */
+	if( request_region(iobase, 256, card_names[card_type]) == NULL )
+	{
+		printk(KERN_WARNING "maestro: can't allocate 256 bytes I/O at 0x%4.4x\n", iobase);
+		return -EBUSY;
+	}
+
+	/* just to be sure */
+	pci_set_master(pcidev);
+
+	card = kmalloc(sizeof(struct ess_card), GFP_KERNEL);
+	if(card == NULL)
+	{
+		printk(KERN_WARNING "maestro: out of memory\n");
+		release_region(iobase, 256);
+		return -ENOMEM;
+	}
+	
+	memset(card, 0, sizeof(*card));
+	card->pcidev = pcidev;
+
+	pmdev = pm_register(PM_PCI_DEV, PM_PCI_ID(pcidev),
+			maestro_pm_callback);
+	if (pmdev)
+		pmdev->data = card;
+
+	card->iobase = iobase;
+	card->card_type = card_type;
+	card->irq = pcidev->irq;
+	card->magic = ESS_CARD_MAGIC;
+	spin_lock_init(&card->lock);
+	init_waitqueue_head(&card->suspend_queue);
+
+	card->dock_mute_vol = 50;
+	
+	/* init our groups of 6 apus */
+	for(i=0;i<NR_DSPS;i++)
+	{
+		struct ess_state *s=&card->channels[i];
+
+		s->index = i;
+
+		s->card = card;
+		init_waitqueue_head(&s->dma_adc.wait);
+		init_waitqueue_head(&s->dma_dac.wait);
+		init_waitqueue_head(&s->open_wait);
+		spin_lock_init(&s->lock);
+		init_MUTEX(&s->open_sem);
+		s->magic = ESS_STATE_MAGIC;
+		
+		s->apu[0] = 6*i;
+		s->apu[1] = (6*i)+1;
+		s->apu[2] = (6*i)+2;
+		s->apu[3] = (6*i)+3;
+		s->apu[4] = (6*i)+4;
+		s->apu[5] = (6*i)+5;
+		
+		if(s->dma_adc.ready || s->dma_dac.ready || s->dma_adc.rawbuf)
+			printk("maestro: BOTCH!\n");
+		/* register devices */
+		if ((s->dev_audio = register_sound_dsp(&ess_audio_fops, -1)) < 0)
+			break;
+	}
+	
+	num = i;
+	
+	/* clear the rest if we ran out of slots to register */
+	for(;i<NR_DSPS;i++)
+	{
+		struct ess_state *s=&card->channels[i];
+		s->dev_audio = -1;
+	}
+	
+	ess = &card->channels[0];
+
+	/*
+	 *	Ok card ready. Begin setup proper
+	 */
+
+	printk(KERN_INFO "maestro: Configuring %s found at IO 0x%04X IRQ %d\n", 
+		card_names[card_type],iobase,card->irq);
+	pci_read_config_dword(pcidev, PCI_SUBSYSTEM_VENDOR_ID, &n);
+	printk(KERN_INFO "maestro:  subvendor id: 0x%08x\n",n); 
+
+	/* turn off power management unless:
+	 *	- the user explicitly asks for it
+	 * 		or
+	 *		- we're not a 2e, lesser chipps seem to have problems.
+	 *		- we're not on our _very_ small whitelist.  some implemenetations
+	 *			really don't like the pm code, others require it.
+	 *			feel free to expand this as required.
+	 */
+#define SUBSYSTEM_VENDOR(x) (x&0xffff)
+	if(	(use_pm != 1) && 
+		((card_type != TYPE_MAESTRO2E)	|| (SUBSYSTEM_VENDOR(n) != 0x1028)))
+			use_pm = 0;
+
+	if(!use_pm) 
+		printk(KERN_INFO "maestro: not attempting power management.\n");
+	else {
+		if(!parse_power(card,pcidev)) 
+			printk(KERN_INFO "maestro: no PCI power management interface found.\n");
+		else {
+			pci_read_config_dword(pcidev, card->power_regs, &n);
+			printk(KERN_INFO "maestro: PCI power management capability: 0x%x\n",n>>16);
+		}	
+	}
+
+	maestro_config(card);
+
+	if(maestro_ac97_get(card, 0x00)==0x0080) {
+		printk(KERN_ERR "maestro: my goodness!  you seem to have a pt101 codec, which is quite rare.\n"
+				"\tyou should tell someone about this.\n");
+	} else {
+		maestro_ac97_init(card);
+	}
+
+	if ((card->dev_mixer = register_sound_mixer(&ess_mixer_fops, -1)) < 0) {
+		printk("maestro: couldn't register mixer!\n");
+	} else {
+		memcpy(card->mix.mixer_state,mixer_defaults,sizeof(card->mix.mixer_state));
+		mixer_push_state(card);
+	}
+	
+	if((ret=request_irq(card->irq, ess_interrupt, SA_SHIRQ, card_names[card_type], card)))
+	{
+		printk(KERN_ERR "maestro: unable to allocate irq %d,\n", card->irq);
+		unregister_sound_mixer(card->dev_mixer);
+		for(i=0;i<NR_DSPS;i++)
+		{
+			struct ess_state *s = &card->channels[i];
+			if(s->dev_audio != -1)
+				unregister_sound_dsp(s->dev_audio);
+		}
+		release_region(card->iobase, 256);		
+		unregister_reboot_notifier(&maestro_nb);
+		kfree(card);
+		return ret;
+	}
+
+	/* Turn on hardware volume control interrupt.
+	   This has to come after we grab the IRQ above,
+	   or a crash will result on installation if a button has been pressed,
+	   because in that case we'll get an immediate interrupt. */
+	n = inw(iobase+0x18);
+	n|=(1<<6);
+	outw(n, iobase+0x18);
+
+	pci_set_drvdata(pcidev,card);
+	/* now go to sleep 'till something interesting happens */
+	maestro_power(card,ACPI_D2);
+
+	printk(KERN_INFO "maestro: %d channels configured.\n", num);
+	return 0;
+}
+
+static void maestro_remove(struct pci_dev *pcidev) {
+	struct ess_card *card = pci_get_drvdata(pcidev);
+	int i;
+	u32 n;
+	
+	/* XXX maybe should force stop bob, but should be all 
+		stopped by _release by now */
+
+	/* Turn off hardware volume control interrupt.
+	   This has to come before we leave the IRQ below,
+	   or a crash results if a button is pressed ! */
+	n = inw(card->iobase+0x18);
+	n&=~(1<<6);
+	outw(n, card->iobase+0x18);
+
+	free_irq(card->irq, card);
+	unregister_sound_mixer(card->dev_mixer);
+	for(i=0;i<NR_DSPS;i++)
+	{
+		struct ess_state *ess = &card->channels[i];
+		if(ess->dev_audio != -1)
+			unregister_sound_dsp(ess->dev_audio);
+	}
+	/* Goodbye, Mr. Bond. */
+	maestro_power(card,ACPI_D3);
+ 	release_region(card->iobase, 256);
+	kfree(card);
+	pci_set_drvdata(pcidev,NULL);
+}
+
+static struct pci_device_id maestro_pci_tbl[] = {
+	{PCI_VENDOR_ESS, PCI_DEVICE_ID_ESS_ESS1968, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TYPE_MAESTRO2},
+	{PCI_VENDOR_ESS, PCI_DEVICE_ID_ESS_ESS1978, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TYPE_MAESTRO2E},
+	{PCI_VENDOR_ESS_OLD, PCI_DEVICE_ID_ESS_ESS0100, PCI_ANY_ID, PCI_ANY_ID, 0, 0, TYPE_MAESTRO},
+	{0,}
+};
+MODULE_DEVICE_TABLE(pci, maestro_pci_tbl);
+
+static struct pci_driver maestro_pci_driver = {
+	.name	  = "maestro",
+	.id_table = maestro_pci_tbl,
+	.probe	  = maestro_probe,
+	.remove	  = maestro_remove,
+};
+
+static int __init init_maestro(void)
+{
+	int rc;
+
+	rc = pci_module_init(&maestro_pci_driver);
+	if (rc < 0)
+		return rc;
+
+	if (register_reboot_notifier(&maestro_nb))
+		printk(KERN_WARNING "maestro: reboot notifier registration failed; may not reboot properly.\n");
+#ifdef MODULE
+	printk(version);
+#endif
+	if (dsps_order < 0)   {
+		dsps_order = 1;
+		printk(KERN_WARNING "maestro: clipping dsps_order to %d\n",dsps_order);
+	}
+	else if (dsps_order > MAX_DSP_ORDER)  {
+		dsps_order = MAX_DSP_ORDER;
+		printk(KERN_WARNING "maestro: clipping dsps_order to %d\n",dsps_order);
+	}
+	return 0;
+}
+
+static int maestro_notifier(struct notifier_block *nb, unsigned long event, void *buf)
+{
+	/* this notifier is called when the kernel is really shut down. */
+	M_printk("maestro: shutting down\n");
+	/* this will remove all card instances too */
+	pci_unregister_driver(&maestro_pci_driver);
+	/* XXX dunno about power management */
+	return NOTIFY_OK;
+}
+
+/* --------------------------------------------------------------------- */
+
+
+static void cleanup_maestro(void) {
+	M_printk("maestro: unloading\n");
+	pci_unregister_driver(&maestro_pci_driver);
+	pm_unregister_all(maestro_pm_callback);
+	unregister_reboot_notifier(&maestro_nb);
+}
+
+/* --------------------------------------------------------------------- */
+
+void
+check_suspend(struct ess_card *card)
+{
+	DECLARE_WAITQUEUE(wait, current);
+
+	if(!card->in_suspend) return;
+
+	card->in_suspend++;
+	add_wait_queue(&(card->suspend_queue), &wait);
+	current->state = TASK_UNINTERRUPTIBLE;
+	schedule();
+	remove_wait_queue(&(card->suspend_queue), &wait);
+	current->state = TASK_RUNNING;
+}
+
+static int 
+maestro_suspend(struct ess_card *card)
+{
+	unsigned long flags;
+	int i,j;
+
+	spin_lock_irqsave(&card->lock,flags); /* over-kill */
+
+	M_printk("maestro: apm in dev %p\n",card);
+
+	/* we have to read from the apu regs, need
+		to power it up */
+	maestro_power(card,ACPI_D0);
+
+	for(i=0;i<NR_DSPS;i++) {
+		struct ess_state *s = &card->channels[i];
+
+		if(s->dev_audio == -1)
+			continue;
+
+		M_printk("maestro: stopping apus for device %d\n",i);
+		stop_dac(s);
+		stop_adc(s);
+		for(j=0;j<6;j++) 
+			card->apu_map[s->apu[j]][5]=apu_get_register(s,j,5);
+
+	}
+
+	/* get rid of interrupts? */
+	if( card->dsps_open > 0)
+		stop_bob(&card->channels[0]);
+
+	card->in_suspend++;
+
+	spin_unlock_irqrestore(&card->lock,flags);
+
+	/* we trust in the bios to power down the chip on suspend.
+	 * XXX I'm also not sure that in_suspend will protect
+	 * against all reg accesses from here on out. 
+	 */
+	return 0;
+}
+static int 
+maestro_resume(struct ess_card *card)
+{
+	unsigned long flags;
+	int i;
+
+	spin_lock_irqsave(&card->lock,flags); /* over-kill */
+
+	card->in_suspend = 0;
+
+	M_printk("maestro: resuming card at %p\n",card);
+
+	/* restore all our config */
+	maestro_config(card);
+	/* need to restore the base pointers.. */ 
+	if(card->dmapages) 
+		set_base_registers(&card->channels[0],card->dmapages);
+
+	mixer_push_state(card);
+
+	/* set each channels' apu control registers before
+	 * restoring audio 
+	 */
+	for(i=0;i<NR_DSPS;i++) {
+		struct ess_state *s = &card->channels[i];
+		int chan,reg;
+
+		if(s->dev_audio == -1)
+			continue;
+
+		for(chan = 0 ; chan < 6 ; chan++) {
+			wave_set_register(s,s->apu[chan]<<3,s->apu_base[chan]);
+			for(reg = 1 ; reg < NR_APU_REGS ; reg++)  
+				apu_set_register(s,chan,reg,s->card->apu_map[s->apu[chan]][reg]);
+		}
+		for(chan = 0 ; chan < 6 ; chan++)  
+			apu_set_register(s,chan,0,s->card->apu_map[s->apu[chan]][0] & 0xFF0F);
+	}
+
+	/* now we flip on the music */
+
+	if( card->dsps_open <= 0) {
+		/* this card's idle */
+		maestro_power(card,ACPI_D2);
+	} else {
+		/* ok, we're actually playing things on
+			this card */
+		maestro_power(card,ACPI_D0);
+		start_bob(&card->channels[0]);
+		for(i=0;i<NR_DSPS;i++) {
+			struct ess_state *s = &card->channels[i];
+
+			/* these use the apu_mode, and can handle
+				spurious calls */
+			start_dac(s);	
+			start_adc(s);	
+		}
+	}
+
+	spin_unlock_irqrestore(&card->lock,flags);
+
+	/* all right, we think things are ready, 
+		wake up people who were using the device
+		when we suspended */
+	wake_up(&(card->suspend_queue));
+
+	return 0;
+}
+
+int 
+maestro_pm_callback(struct pm_dev *dev, pm_request_t rqst, void *data) 
+{
+	struct ess_card *card = (struct ess_card*) dev->data;
+
+	if ( ! card ) goto out;
+
+	M_printk("maestro: pm event 0x%x received for card %p\n", rqst, card);
+	
+	switch (rqst) {
+		case PM_SUSPEND: 
+			maestro_suspend(card);
+		break;
+		case PM_RESUME: 
+			maestro_resume(card);
+		break;
+		/*
+		 * we'd also like to find out about
+		 * power level changes because some biosen
+		 * do mean things to the maestro when they
+		 * change their power state.
+		 */
+        }
+out:
+	return 0;
+}
+
+module_init(init_maestro);
+module_exit(cleanup_maestro);