[ALSA] AZT3328 driver update

Modules: AZT3328 driver

this is now an even much more reworked patch (#3) for my azt3328.c ALSA driver.
IOW I spent another 4 evenings to get the sequencer timer to work properly
(my head is still hurting) and do lots of other cleanups.

Note that despite the extensive sequencer timer additions, the driver object
is still only 2kB bigger than the previous version, due to those many
optimizations...

Changes in version #3:
- fully working ALSA sequencer timer support for the card's 1024000Hz
  DirectX timer (downscaling adjustable via seqtimer_scaling module param)
- an insane amount of code optimizations
- many, many cleanups

Changes in version #2:
- FOUND the 1us DirectX timer area (yay!), made the code respect it
properly
- renamed some 'weird' mixer control names according to ControlNames.txt
- cleanup unneeded debug messages, reformatting
- improved I/O register documentation
- constified many more structs

Changes in version #1:
- improves/fixes some fatal playback/recording interaction
- improves IRQ handler performance (and actually fixes some weird code)
- coalesces some I/O accesses
- slightly improves I/O interface documentation
- improves/fixes logging
- defines out some less important debug code
- constifies some data

Signed-off-by: Andreas Mohr <andi@lisas.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

2 files changed, 728 insertions, 388 deletions

diff --git a/sound/pci/azt3328.c b/sound/pci/azt3328.c
index 8260079..da99b1b 100644
--- a/sound/pci/azt3328.c
+++ b/sound/pci/azt3328.c
@@ -1,6 +1,6 @@
 /*
  *  azt3328.c - driver for Aztech AZF3328 based soundcards (e.g. PCI168).
- *  Copyright (C) 2002 by Andreas Mohr <hw7oshyuv3001@sneakemail.com>
+ *  Copyright (C) 2002, 2005 by Andreas Mohr <andi AT lisas.de>
  *
  *  Framework borrowed from Bart Hartgers's als4000.c.
  *  Driver developed on PCI168 AP(W) version (PCI rev. 10, subsystem ID 1801),
@@ -46,7 +46,7 @@
  *  - MPU401 (+ legacy address support) FIXME: how to enable legacy addr??
  *  - game port (legacy address support)
  *  - built-in General DirectX timer having a 20 bits counter
- *    with 1us resolution (FIXME: where is it?)
+ *    with 1us resolution (see below!)
  *  - I2S serial port for external DAC
  *  - supports 33MHz PCI spec 2.1, PCI power management 1.0, compliant with ACPI
  *  - supports hardware volume control
@@ -55,13 +55,23 @@
  *    required for Microsoft's logo compliance (FIXME: where?)
  *  - PCI168 AP(W) card: power amplifier with 4 Watts/channel at 4 Ohms
  *
+ *  Note that this driver now is actually *better* than the Windows driver,
+ *  since it additionally supports the card's 1MHz DirectX timer - just try
+ *  the following snd-seq module parameters etc.:
+ *  - options snd-seq seq_default_timer_class=2 seq_default_timer_sclass=0
+ *    seq_default_timer_card=0 seq_client_load=1 seq_default_timer_device=0
+ *    seq_default_timer_subdevice=0 seq_default_timer_resolution=1000000
+ *  - "timidity -iAv -B2,8 -Os -EFreverb=0"
+ *  - "pmidi -p 128:0 jazz.mid"
+ *
  *  Certain PCI versions of this card are susceptible to DMA traffic underruns
  *  in some systems (resulting in sound crackling/clicking/popping),
  *  probably because they don't have a DMA FIFO buffer or so.
  *  Overview (PCI ID/PCI subID/PCI rev.):
  *  - no DMA crackling on SiS735: 0x50DC/0x1801/16
  *  - unknown performance: 0x50DC/0x1801/10
- *  
+ *    (well, it's not bad on an Athlon 1800 with now very optimized IRQ handler)
+ *
  *  Crackling happens with VIA chipsets or, in my case, an SiS735, which is
  *  supposed to be very fast and supposed to get rid of crackling much
  *  better than a VIA, yet ironically I still get crackling, like many other
@@ -76,18 +86,13 @@
  *  - Disable ACPI/power management/"Auto Detect RAM/PCI Clk" in BIOS
  * 
  * BUGS
- *  - when Ctrl-C'ing mpg321, the playback loops a bit
- *    (premature DMA playback reset?)
- *  - full-duplex sometimes breaks (IRQ management issues?).
- *    Once even a spontaneous REBOOT happened!!!
+ *  - full-duplex might *still* be problematic, not fully tested recently
  * 
  * TODO
  *  - test MPU401 MIDI playback etc.
- *  - power management (CONFIG_PM). See e.g. intel8x0 or cs4281.
+ *  - power management. See e.g. intel8x0 or cs4281.
  *    This would be nice since the chip runs a bit hot, and it's *required*
- *    anyway for proper ACPI power management. In other words: rest
- *    assured that I *will* implement this very soon; as soon as Linux 2.5.x
- *    has power management that's bugfree enough to work properly on my desktop.
+ *    anyway for proper ACPI power management.
  *  - figure out what all unknown port bits are responsible for
  */
 
@@ -108,7 +113,7 @@
 #include <sound/initval.h>
 #include "azt3328.h"
 
-MODULE_AUTHOR("Andreas Mohr <hw7oshyuv3001@sneakemail.com>");
+MODULE_AUTHOR("Andreas Mohr <andi AT lisas.de>");
 MODULE_DESCRIPTION("Aztech AZF3328 (PCI168)");
 MODULE_LICENSE("GPL");
 MODULE_SUPPORTED_DEVICE("{{Aztech,AZF3328}}");
@@ -122,6 +127,7 @@ MODULE_SUPPORTED_DEVICE("{{Aztech,AZF3328}}");
 #define DEBUG_MIXER	0
 #define DEBUG_PLAY_REC	0
 #define DEBUG_IO	0
+#define DEBUG_TIMER	0
 #define MIXER_TESTING	0
 
 #if DEBUG_MISC
@@ -132,8 +138,8 @@ MODULE_SUPPORTED_DEVICE("{{Aztech,AZF3328}}");
 
 #if DEBUG_CALLS
 #define snd_azf3328_dbgcalls(format, args...) printk(format, ##args)
-#define snd_azf3328_dbgcallenter() printk(KERN_ERR "entering %s\n", __FUNCTION__)
-#define snd_azf3328_dbgcallleave() printk(KERN_ERR "leaving %s\n", __FUNCTION__)
+#define snd_azf3328_dbgcallenter() printk(KERN_ERR "--> %s\n", __FUNCTION__)
+#define snd_azf3328_dbgcallleave() printk(KERN_ERR "<-- %s\n", __FUNCTION__)
 #else
 #define snd_azf3328_dbgcalls(format, args...)
 #define snd_azf3328_dbgcallenter()
@@ -152,13 +158,12 @@ MODULE_SUPPORTED_DEVICE("{{Aztech,AZF3328}}");
 #define snd_azf3328_dbgplay(format, args...)
 #endif		
 
-#if DEBUG_IO
-#define snd_azf3328_dbgio(chip, where) \
-	    printk(KERN_ERR "%s: IDX_IO_PLAY_FLAGS %04x, IDX_IO_PLAY_IRQMASK %04x, IDX_IO_IRQSTATUS %04x\n", where, inw(chip->codec_port+IDX_IO_PLAY_FLAGS), inw(chip->codec_port+IDX_IO_PLAY_IRQMASK), inw(chip->codec_port+IDX_IO_IRQSTATUS))
+#if DEBUG_MISC
+#define snd_azf3328_dbgtimer(format, args...) printk(KERN_ERR format, ##args)
 #else
-#define snd_azf3328_dbgio(chip, where)
-#endif
-	    
+#define snd_azf3328_dbgtimer(format, args...)
+#endif		
+
 static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;	/* Index 0-MAX */
 module_param_array(index, int, NULL, 0444);
 MODULE_PARM_DESC(index, "Index value for AZF3328 soundcard.");
@@ -177,35 +182,40 @@ module_param_array(joystick, bool, NULL, 0444);
 MODULE_PARM_DESC(joystick, "Enable joystick for AZF3328 soundcard.");
 #endif
 
-typedef struct _snd_azf3328 azf3328_t;
-
-struct _snd_azf3328 {
-	int irq;
+static int seqtimer_scaling = 128;
+module_param(seqtimer_scaling, int, 0444);
+MODULE_PARM_DESC(seqtimer_scaling, "Set 1024000Hz sequencer timer scale factor (lockup danger!). Default 128.");
 
+typedef struct _snd_azf3328 {
+	/* often-used fields towards beginning, then grouped */
 	unsigned long codec_port;
 	unsigned long io2_port;
 	unsigned long mpu_port;
 	unsigned long synth_port;
 	unsigned long mixer_port;
 
-#ifdef SUPPORT_JOYSTICK
-	struct gameport *gameport;
-#endif
-
-	struct pci_dev *pci;
-	snd_card_t *card;
+	spinlock_t reg_lock;
 
+	snd_timer_t *timer;
+	
 	snd_pcm_t *pcm;
-	snd_rawmidi_t *rmidi;
 	snd_pcm_substream_t *playback_substream;
 	snd_pcm_substream_t *capture_substream;
 	unsigned int is_playing;
 	unsigned int is_recording;
 
-	spinlock_t reg_lock;
-};
+	snd_card_t *card;
+	snd_rawmidi_t *rmidi;
+
+#ifdef SUPPORT_JOYSTICK
+	struct gameport *gameport;
+#endif
 
-static struct pci_device_id snd_azf3328_ids[] = {
+	struct pci_dev *pci;
+	int irq;
+} azf3328_t;
+
+static const struct pci_device_id snd_azf3328_ids[] = {
 	{ 0x122D, 0x50DC, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },   /* PCI168/3328 */
 	{ 0x122D, 0x80DA, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },   /* 3328 */
 	{ 0, }
@@ -213,57 +223,90 @@ static struct pci_device_id snd_azf3328_ids[] = {
 
 MODULE_DEVICE_TABLE(pci, snd_azf3328_ids);
 
-static inline void snd_azf3328_io2_write(azf3328_t *chip, int reg, unsigned char value)
+static inline void
+snd_azf3328_codec_outb(const azf3328_t *chip, int reg, u8 value)
+{
+	outb(value, chip->codec_port + reg);
+}
+
+static inline u8
+snd_azf3328_codec_inb(const azf3328_t *chip, int reg)
+{
+	return inb(chip->codec_port + reg);
+}
+
+static inline void
+snd_azf3328_codec_outw(const azf3328_t *chip, int reg, u16 value)
+{
+	outw(value, chip->codec_port + reg);
+}
+
+static inline u16
+snd_azf3328_codec_inw(const azf3328_t *chip, int reg)
+{
+	return inw(chip->codec_port + reg);
+}
+
+static inline void
+snd_azf3328_codec_outl(const azf3328_t *chip, int reg, u32 value)
+{
+	outl(value, chip->codec_port + reg);
+}
+
+static inline void
+snd_azf3328_io2_outb(const azf3328_t *chip, int reg, u8 value)
 {
 	outb(value, chip->io2_port + reg);
 }
 
-static inline unsigned char snd_azf3328_io2_read(azf3328_t *chip, int reg)
+static inline u8
+snd_azf3328_io2_inb(const azf3328_t *chip, int reg)
 {
 	return inb(chip->io2_port + reg);
 }
 
-static void snd_azf3328_mixer_write(azf3328_t *chip, int reg, unsigned long value, int type)
+static inline void
+snd_azf3328_mixer_outw(const azf3328_t *chip, int reg, u16 value)
 {
-	switch(type) {
-	case WORD_VALUE:
-		outw(value, chip->mixer_port + reg);
-		break;
-	case DWORD_VALUE:
-		outl(value, chip->mixer_port + reg);
-		break;
-	case BYTE_VALUE:
-		outb(value, chip->mixer_port + reg);
-		break;
-	}
+	outw(value, chip->mixer_port + reg);
+}
+
+static inline u16
+snd_azf3328_mixer_inw(const azf3328_t *chip, int reg)
+{
+	return inw(chip->mixer_port + reg);
 }
 
-static void snd_azf3328_mixer_set_mute(azf3328_t *chip, int reg, int do_mute)
+static void
+snd_azf3328_mixer_set_mute(const azf3328_t *chip, int reg, int do_mute)
 {
+	unsigned long portbase = chip->mixer_port + reg + 1;
 	unsigned char oldval;
 
 	/* the mute bit is on the *second* (i.e. right) register of a
 	 * left/right channel setting */
-	oldval = inb(chip->mixer_port + reg + 1);
+	oldval = inb(portbase);
 	if (do_mute)
 		oldval |= 0x80;
 	else
 		oldval &= ~0x80;
-	outb(oldval, chip->mixer_port + reg + 1);
+	outb(oldval, portbase);
 }
 
-static void snd_azf3328_mixer_write_volume_gradually(azf3328_t *chip, int reg, unsigned char dst_vol_left, unsigned char dst_vol_right, int chan_sel, int delay)
+static void
+snd_azf3328_mixer_write_volume_gradually(const azf3328_t *chip, int reg, unsigned char dst_vol_left, unsigned char dst_vol_right, int chan_sel, int delay)
 {
+	unsigned long portbase = chip->mixer_port + reg;
 	unsigned char curr_vol_left = 0, curr_vol_right = 0;
 	int left_done = 0, right_done = 0;
 	
 	snd_azf3328_dbgcallenter();
 	if (chan_sel & SET_CHAN_LEFT)
-		curr_vol_left  = inb(chip->mixer_port + reg + 1);
+		curr_vol_left  = inb(portbase + 1);
 	else
 		left_done = 1;
 	if (chan_sel & SET_CHAN_RIGHT)
-		curr_vol_right = inb(chip->mixer_port + reg + 0);
+		curr_vol_right = inb(portbase + 0);
 	else
 		right_done = 1;
 	
@@ -284,7 +327,7 @@ static void snd_azf3328_mixer_write_volume_gradually(azf3328_t *chip, int reg, u
 				curr_vol_left++;
 			else
 			    left_done = 1;
-			outb(curr_vol_left, chip->mixer_port + reg + 1);
+			outb(curr_vol_left, portbase + 1);
 		}
 		if (!right_done)
 		{
@@ -298,7 +341,7 @@ static void snd_azf3328_mixer_write_volume_gradually(azf3328_t *chip, int reg, u
 			/* during volume change, the right channel is crackling
 			 * somewhat more than the left channel, unfortunately.
 			 * This seems to be a hardware issue. */
-			outb(curr_vol_right, chip->mixer_port + reg + 0);
+			outb(curr_vol_right, portbase + 0);
 		}
 		if (delay)
 			mdelay(delay);
@@ -320,7 +363,11 @@ typedef struct azf3328_mixer_reg {
 } azf3328_mixer_reg_t;
 
 #define COMPOSE_MIXER_REG(reg,lchan_shift,rchan_shift,mask,invert,stereo,enum_c) \
- ((reg) | (lchan_shift << 8) | (rchan_shift << 12) | (mask << 16) | (invert << 24) | (stereo << 25) | (enum_c << 26))
+ ((reg) | (lchan_shift << 8) | (rchan_shift << 12) | \
+  (mask << 16) | \
+  (invert << 24) | \
+  (stereo << 25) | \
+  (enum_c << 26))
 
 static void snd_azf3328_mixer_reg_decode(azf3328_mixer_reg_t *r, unsigned long val)
 {
@@ -372,13 +419,15 @@ static void snd_azf3328_mixer_reg_decode(azf3328_mixer_reg_t *r, unsigned long v
   .private_value = COMPOSE_MIXER_REG(reg, shift, 0, 0, 0, 0, enum_c), \
 }
 
-static int snd_azf3328_info_mixer(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t *uinfo)
+static int
+snd_azf3328_info_mixer(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t *uinfo)
 {
 	azf3328_mixer_reg_t reg;
 
 	snd_azf3328_dbgcallenter();
 	snd_azf3328_mixer_reg_decode(&reg, kcontrol->private_value);
-	uinfo->type = reg.mask == 1 ? SNDRV_CTL_ELEM_TYPE_BOOLEAN : SNDRV_CTL_ELEM_TYPE_INTEGER;
+	uinfo->type = reg.mask == 1 ?
+		SNDRV_CTL_ELEM_TYPE_BOOLEAN : SNDRV_CTL_ELEM_TYPE_INTEGER;
 	uinfo->count = reg.stereo + 1;
 	uinfo->value.integer.min = 0;
 	uinfo->value.integer.max = reg.mask;
@@ -386,7 +435,8 @@ static int snd_azf3328_info_mixer(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t
 	return 0;
 }
 
-static int snd_azf3328_get_mixer(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
+static int
+snd_azf3328_get_mixer(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
 {
 	azf3328_t *chip = snd_kcontrol_chip(kcontrol);
 	azf3328_mixer_reg_t reg;
@@ -395,7 +445,7 @@ static int snd_azf3328_get_mixer(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t
 	snd_azf3328_dbgcallenter();
 	snd_azf3328_mixer_reg_decode(&reg, kcontrol->private_value);
 
-	oreg = inw(chip->mixer_port + reg.reg);
+	oreg = snd_azf3328_mixer_inw(chip, reg.reg);
 	val = (oreg >> reg.lchan_shift) & reg.mask;
 	if (reg.invert)
 		val = reg.mask - val;
@@ -406,12 +456,17 @@ static int snd_azf3328_get_mixer(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t
 			val = reg.mask - val;
 		ucontrol->value.integer.value[1] = val;
 	}
-	snd_azf3328_dbgmixer("get: %02x is %04x -> vol %02lx|%02lx (shift %02d|%02d, mask %02x, inv. %d, stereo %d)\n", reg.reg, oreg, ucontrol->value.integer.value[0], ucontrol->value.integer.value[1], reg.lchan_shift, reg.rchan_shift, reg.mask, reg.invert, reg.stereo);
+	snd_azf3328_dbgmixer("get: %02x is %04x -> vol %02lx|%02lx "
+			     "(shift %02d|%02d, mask %02x, inv. %d, stereo %d)\n",
+		reg.reg, oreg,
+		ucontrol->value.integer.value[0], ucontrol->value.integer.value[1],
+		reg.lchan_shift, reg.rchan_shift, reg.mask, reg.invert, reg.stereo);
 	snd_azf3328_dbgcallleave();
 	return 0;
 }
 
-static int snd_azf3328_put_mixer(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
+static int
+snd_azf3328_put_mixer(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
 {
 	azf3328_t *chip = snd_kcontrol_chip(kcontrol);
 	azf3328_mixer_reg_t reg;
@@ -419,7 +474,7 @@ static int snd_azf3328_put_mixer(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t
 
 	snd_azf3328_dbgcallenter();
 	snd_azf3328_mixer_reg_decode(&reg, kcontrol->private_value);
-	oreg = inw(chip->mixer_port + reg.reg);
+	oreg = snd_azf3328_mixer_inw(chip, reg.reg);
 	val = ucontrol->value.integer.value[0] & reg.mask;
 	if (reg.invert)
 		val = reg.mask - val;
@@ -433,24 +488,37 @@ static int snd_azf3328_put_mixer(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t
 		nreg |= (val << reg.rchan_shift);
 	}
 	if (reg.mask >= 0x07) /* it's a volume control, so better take care */
-		snd_azf3328_mixer_write_volume_gradually(chip, reg.reg, nreg >> 8, nreg & 0xff, SET_CHAN_LEFT|SET_CHAN_RIGHT, 0); /* just set both channels, doesn't matter */
+		snd_azf3328_mixer_write_volume_gradually(
+			chip, reg.reg, nreg >> 8, nreg & 0xff,
+			/* just set both channels, doesn't matter */
+			SET_CHAN_LEFT|SET_CHAN_RIGHT,
+			0);
 	else
-        	outw(nreg, chip->mixer_port + reg.reg);
+        	snd_azf3328_mixer_outw(chip, reg.reg, nreg);
 
-	snd_azf3328_dbgmixer("put: %02x to %02lx|%02lx, oreg %04x; shift %02d|%02d -> nreg %04x; after: %04x\n", reg.reg, ucontrol->value.integer.value[0], ucontrol->value.integer.value[1], oreg, reg.lchan_shift, reg.rchan_shift, nreg, inw(chip->mixer_port + reg.reg));
+	snd_azf3328_dbgmixer("put: %02x to %02lx|%02lx, "
+			     "oreg %04x; shift %02d|%02d -> nreg %04x; after: %04x\n",
+		reg.reg, ucontrol->value.integer.value[0], ucontrol->value.integer.value[1],
+		oreg, reg.lchan_shift, reg.rchan_shift,
+		nreg, snd_azf3328_mixer_inw(chip, reg.reg));
 	snd_azf3328_dbgcallleave();
 	return (nreg != oreg);
 }
 
-static int snd_azf3328_info_mixer_enum(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t * uinfo)
+static int
+snd_azf3328_info_mixer_enum(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t * uinfo)
 {
-	azf3328_mixer_reg_t reg;
-	static char *texts1[2] = { "ModemOut1", "ModemOut2" };
-	static char *texts2[2] = { "MonoSelectSource1", "MonoSelectSource2" };
-        static char *texts3[8] = {
-                "Mic", "CD", "Video", "Aux", "Line",
-                "Mix", "Mix Mono", "Phone"
+	static const char * const texts1[] = {
+		"ModemOut1", "ModemOut2"
+	};
+	static const char * const texts2[] = {
+		"MonoSelectSource1", "MonoSelectSource2"
+	};
+	static const char * const texts3[] = {
+                "Mic", "CD", "Video", "Aux",
+		"Line", "Mix", "Mix Mono", "Phone"
         };
+	azf3328_mixer_reg_t reg;
 
 	snd_azf3328_mixer_reg_decode(&reg, kcontrol->private_value);
         uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
@@ -471,14 +539,15 @@ static int snd_azf3328_info_mixer_enum(snd_kcontrol_t *kcontrol, snd_ctl_elem_in
         return 0;
 }
 
-static int snd_azf3328_get_mixer_enum(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
+static int
+snd_azf3328_get_mixer_enum(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
 {
-	azf3328_mixer_reg_t reg;
         azf3328_t *chip = snd_kcontrol_chip(kcontrol);
+	azf3328_mixer_reg_t reg;
         unsigned short val;
         
 	snd_azf3328_mixer_reg_decode(&reg, kcontrol->private_value);
-	val = inw(chip->mixer_port + reg.reg);
+	val = snd_azf3328_mixer_inw(chip, reg.reg);
 	if (reg.reg == IDX_MIXER_REC_SELECT)
 	{
         	ucontrol->value.enumerated.item[0] = (val >> 8) & (reg.enum_c - 1);
@@ -486,18 +555,22 @@ static int snd_azf3328_get_mixer_enum(snd_kcontrol_t * kcontrol, snd_ctl_elem_va
 	}
 	else
         	ucontrol->value.enumerated.item[0] = (val >> reg.lchan_shift) & (reg.enum_c - 1);
-	snd_azf3328_dbgmixer("get_enum: %02x is %04x -> %d|%d (shift %02d, enum_c %d)\n", reg.reg, val, ucontrol->value.enumerated.item[0], ucontrol->value.enumerated.item[1], reg.lchan_shift, reg.enum_c);
+
+	snd_azf3328_dbgmixer("get_enum: %02x is %04x -> %d|%d (shift %02d, enum_c %d)\n",
+		reg.reg, val, ucontrol->value.enumerated.item[0], ucontrol->value.enumerated.item[1],
+		reg.lchan_shift, reg.enum_c);
         return 0;
 }
 
-static int snd_azf3328_put_mixer_enum(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
+static int
+snd_azf3328_put_mixer_enum(snd_kcontrol_t * kcontrol, snd_ctl_elem_value_t * ucontrol)
 {
-	azf3328_mixer_reg_t reg;
         azf3328_t *chip = snd_kcontrol_chip(kcontrol);
+	azf3328_mixer_reg_t reg;
 	unsigned int oreg, nreg, val;
         
 	snd_azf3328_mixer_reg_decode(&reg, kcontrol->private_value);
-	oreg = inw(chip->mixer_port + reg.reg);
+	oreg = snd_azf3328_mixer_inw(chip, reg.reg);
 	val = oreg;
 	if (reg.reg == IDX_MIXER_REC_SELECT)
 	{
@@ -514,19 +587,19 @@ static int snd_azf3328_put_mixer_enum(snd_kcontrol_t * kcontrol, snd_ctl_elem_va
 		val &= ~((reg.enum_c - 1) << reg.lchan_shift);
         	val |= (ucontrol->value.enumerated.item[0] << reg.lchan_shift);
 	}
-	outw(val, chip->mixer_port + reg.reg);
+	snd_azf3328_mixer_outw(chip, reg.reg, val);
 	nreg = val;
 
 	snd_azf3328_dbgmixer("put_enum: %02x to %04x, oreg %04x\n", reg.reg, val, oreg);
 	return (nreg != oreg);
 }
 
-static snd_kcontrol_new_t snd_azf3328_mixer_controls[] __devinitdata = {
+static const snd_kcontrol_new_t snd_azf3328_mixer_controls[] __devinitdata = {
 	AZF3328_MIXER_SWITCH("Master Playback Switch", IDX_MIXER_PLAY_MASTER, 15, 1),
 	AZF3328_MIXER_VOL_STEREO("Master Playback Volume", IDX_MIXER_PLAY_MASTER, 0x1f, 1),
 	AZF3328_MIXER_SWITCH("Wave Playback Switch", IDX_MIXER_WAVEOUT, 15, 1),
 	AZF3328_MIXER_VOL_STEREO("Wave Playback Volume", IDX_MIXER_WAVEOUT, 0x1f, 1),
-	AZF3328_MIXER_SWITCH("Wave Playback 3D Bypass", IDX_MIXER_ADVCTL2, 7, 1),
+	AZF3328_MIXER_SWITCH("Wave 3D Bypass Playback Switch", IDX_MIXER_ADVCTL2, 7, 1),
 	AZF3328_MIXER_SWITCH("FM Playback Switch", IDX_MIXER_FMSYNTH, 15, 1),
 	AZF3328_MIXER_VOL_STEREO("FM Playback Volume", IDX_MIXER_FMSYNTH, 0x1f, 1),
 	AZF3328_MIXER_SWITCH("CD Playback Switch", IDX_MIXER_CDAUDIO, 15, 1),
@@ -539,8 +612,8 @@ static snd_kcontrol_new_t snd_azf3328_mixer_controls[] __devinitdata = {
 	AZF3328_MIXER_SWITCH("Mic Boost (+20dB)", IDX_MIXER_MIC, 6, 0),
 	AZF3328_MIXER_SWITCH("Line Playback Switch", IDX_MIXER_LINEIN, 15, 1),
 	AZF3328_MIXER_VOL_STEREO("Line Playback Volume", IDX_MIXER_LINEIN, 0x1f, 1),
-	AZF3328_MIXER_SWITCH("PCBeep Playback Switch", IDX_MIXER_PCBEEP, 15, 1),
-	AZF3328_MIXER_VOL_SPECIAL("PCBeep Playback Volume", IDX_MIXER_PCBEEP, 0x0f, 1, 1),
+	AZF3328_MIXER_SWITCH("PC Speaker Playback Switch", IDX_MIXER_PCBEEP, 15, 1),
+	AZF3328_MIXER_VOL_SPECIAL("PC Speaker Playback Volume", IDX_MIXER_PCBEEP, 0x0f, 1, 1),
 	AZF3328_MIXER_SWITCH("Video Playback Switch", IDX_MIXER_VIDEO, 15, 1),
 	AZF3328_MIXER_VOL_STEREO("Video Playback Volume", IDX_MIXER_VIDEO, 0x1f, 1),
 	AZF3328_MIXER_SWITCH("Aux Playback Switch", IDX_MIXER_AUX, 15, 1),
@@ -553,8 +626,8 @@ static snd_kcontrol_new_t snd_azf3328_mixer_controls[] __devinitdata = {
 	AZF3328_MIXER_ENUM("Mono Select Source", IDX_MIXER_ADVCTL2, 2, 9),
 	AZF3328_MIXER_VOL_SPECIAL("Tone Control - Treble", IDX_MIXER_BASSTREBLE, 0x07, 1, 0),
 	AZF3328_MIXER_VOL_SPECIAL("Tone Control - Bass", IDX_MIXER_BASSTREBLE, 0x07, 9, 0),
-	AZF3328_MIXER_SWITCH("3D Control - Toggle", IDX_MIXER_ADVCTL2, 13, 0),
-	AZF3328_MIXER_VOL_SPECIAL("3D Control - Volume", IDX_MIXER_ADVCTL1, 0x07, 1, 0), /* "3D Width" */
+	AZF3328_MIXER_SWITCH("3D Control - Switch", IDX_MIXER_ADVCTL2, 13, 0),
+	AZF3328_MIXER_VOL_SPECIAL("3D Control - Wide", IDX_MIXER_ADVCTL1, 0x07, 1, 0), /* "3D Width" */
 	AZF3328_MIXER_VOL_SPECIAL("3D Control - Space", IDX_MIXER_ADVCTL1, 0x03, 8, 0), /* "Hifi 3D" */
 #if MIXER_TESTING
 	AZF3328_MIXER_SWITCH("0", IDX_MIXER_ADVCTL2, 0, 0),
@@ -576,9 +649,7 @@ static snd_kcontrol_new_t snd_azf3328_mixer_controls[] __devinitdata = {
 #endif
 };
 
-#define AZF3328_INIT_VALUES (sizeof(snd_azf3328_init_values)/sizeof(unsigned int)/2)
-
-static unsigned int snd_azf3328_init_values[][2] = {
+static const u16 __devinitdata snd_azf3328_init_values[][2] = {
         { IDX_MIXER_PLAY_MASTER,	MIXER_MUTE_MASK|0x1f1f },
         { IDX_MIXER_MODEMOUT,		MIXER_MUTE_MASK|0x1f1f },
 	{ IDX_MIXER_BASSTREBLE,		0x0000 },
@@ -594,10 +665,11 @@ static unsigned int snd_azf3328_init_values[][2] = {
         { IDX_MIXER_REC_VOLUME,		MIXER_MUTE_MASK|0x0707 },
 };
 
-static int __devinit snd_azf3328_mixer_new(azf3328_t *chip)
+static int __devinit
+snd_azf3328_mixer_new(azf3328_t *chip)
 {
 	snd_card_t *card;
-	snd_kcontrol_new_t *sw;
+	const snd_kcontrol_new_t *sw;
 	unsigned int idx;
 	int err;
 
@@ -607,11 +679,13 @@ static int __devinit snd_azf3328_mixer_new(azf3328_t *chip)
 	card = chip->card;
 
 	/* mixer reset */
-	snd_azf3328_mixer_write(chip, IDX_MIXER_RESET, 0x0, WORD_VALUE);
+	snd_azf3328_mixer_outw(chip, IDX_MIXER_RESET, 0x0000);
 
 	/* mute and zero volume channels */
-	for (idx = 0; idx < AZF3328_INIT_VALUES; idx++) {
-		snd_azf3328_mixer_write(chip, snd_azf3328_init_values[idx][0], snd_azf3328_init_values[idx][1], WORD_VALUE);
+	for (idx = 0; idx < ARRAY_SIZE(snd_azf3328_init_values); idx++) {
+		snd_azf3328_mixer_outw(chip,
+			snd_azf3328_init_values[idx][0],
+			snd_azf3328_init_values[idx][1]);
 	}
 	
 	/* add mixer controls */
@@ -627,7 +701,8 @@ static int __devinit snd_azf3328_mixer_new(azf3328_t *chip)
 	return 0;
 }
 
-static int snd_azf3328_hw_params(snd_pcm_substream_t * substream,
+static int
+snd_azf3328_hw_params(snd_pcm_substream_t * substream,
 				 snd_pcm_hw_params_t * hw_params)
 {
 	int res;
@@ -637,7 +712,8 @@ static int snd_azf3328_hw_params(snd_pcm_substream_t * substream,
 	return res;
 }
 
-static int snd_azf3328_hw_free(snd_pcm_substream_t * substream)
+static int
+snd_azf3328_hw_free(snd_pcm_substream_t * substream)
 {
 	snd_azf3328_dbgcallenter();
 	snd_pcm_lib_free_pages(substream);
@@ -645,43 +721,48 @@ static int snd_azf3328_hw_free(snd_pcm_substream_t * substream)
 	return 0;
 }
 
-static void snd_azf3328_setfmt(azf3328_t *chip,
+static void
+snd_azf3328_setfmt(azf3328_t *chip,
 			       unsigned int reg,
 			       unsigned int bitrate,
 			       unsigned int format_width,
 			       unsigned int channels
 )
 {
-	unsigned int val = 0xff00;
+	u16 val = 0xff00;
 	unsigned long flags;
 
 	snd_azf3328_dbgcallenter();
 	switch (bitrate) {
-	case  5512: val |= 0x0d; break; /* the AZF3328 names it "5510" for some strange reason */
-	case  6620: val |= 0x0b; break;
-	case  8000: val |= 0x00; break;
-	case  9600: val |= 0x08; break;
-	case 11025: val |= 0x01; break;
-	case 16000: val |= 0x02; break;
-	case 22050: val |= 0x03; break;
-	case 32000: val |= 0x04; break;
-	case 44100: val |= 0x05; break;
-	case 48000: val |= 0x06; break;
-	case 64000: val |= 0x07; break;
+	case  4000: val |= SOUNDFORMAT_FREQ_SUSPECTED_4000; break;
+	case  4800: val |= SOUNDFORMAT_FREQ_SUSPECTED_4800; break;
+	case  5512: val |= SOUNDFORMAT_FREQ_5510; break; /* the AZF3328 names it "5510" for some strange reason */
+	case  6620: val |= SOUNDFORMAT_FREQ_6620; break;
+	case  8000: val |= SOUNDFORMAT_FREQ_8000; break;
+	case  9600: val |= SOUNDFORMAT_FREQ_9600; break;
+	case 11025: val |= SOUNDFORMAT_FREQ_11025; break;
+	case 13240: val |= SOUNDFORMAT_FREQ_SUSPECTED_13240; break;
+	case 16000: val |= SOUNDFORMAT_FREQ_16000; break;
+	case 22050: val |= SOUNDFORMAT_FREQ_22050; break;
+	case 32000: val |= SOUNDFORMAT_FREQ_32000; break;
+	case 44100: val |= SOUNDFORMAT_FREQ_44100; break;
+	case 48000: val |= SOUNDFORMAT_FREQ_48000; break;
+	case 66200: val |= SOUNDFORMAT_FREQ_SUSPECTED_66200; break;
 	default:
 		snd_printk(KERN_WARNING "unknown bitrate %d, assuming 44.1kHz!\n", bitrate);
-		val |= 0x05; /* 44100 */
+		val |= SOUNDFORMAT_FREQ_44100;
 		break;
 	}
-	/* val = 0xff07; 3m27.993s (65301Hz; -> 64000Hz???) */
-	/* val = 0xff09; 17m15.098s (13123,478Hz; -> 12000Hz???) */
-	/* val = 0xff0a; 47m30.599s (4764,891Hz; -> 4800Hz???) */
-	/* val = 0xff0c; 57m0.510s (4010,263Hz; -> 4000Hz???) */
+	/* val = 0xff07; 3m27.993s (65301Hz; -> 64000Hz???) hmm, 66120, 65967, 66123 */
+	/* val = 0xff09; 17m15.098s (13123,478Hz; -> 12000Hz???) hmm, 13237.2Hz? */
+	/* val = 0xff0a; 47m30.599s (4764,891Hz; -> 4800Hz???) yup, 4803Hz */
+	/* val = 0xff0c; 57m0.510s (4010,263Hz; -> 4000Hz???) yup, 4003Hz */
 	/* val = 0xff05; 5m11.556s (... -> 44100Hz) */
 	/* val = 0xff03; 10m21.529s (21872,463Hz; -> 22050Hz???) */
 	/* val = 0xff0f; 20m41.883s (10937,993Hz; -> 11025Hz???) */
 	/* val = 0xff0d; 41m23.135s (5523,600Hz; -> 5512Hz???) */
 	/* val = 0xff0e; 28m30.777s (8017Hz; -> 8000Hz???) */
+
 	if (channels == 2)
 		val |= SOUNDFORMAT_FLAG_2CHANNELS;
 
@@ -691,7 +772,7 @@ static void snd_azf3328_setfmt(azf3328_t *chip,
 	spin_lock_irqsave(&chip->reg_lock, flags);
 	
 	/* set bitrate/format */
-	outw(val, chip->codec_port+reg);
+	snd_azf3328_codec_outw(chip, reg, val);
 	
 	/* changing the bitrate/format settings switches off the
 	 * audio output with an annoying click in case of 8/16bit format change
@@ -701,47 +782,67 @@ static void snd_azf3328_setfmt(azf3328_t *chip,
 	 * FIXME: does this have some side effects for full-duplex
 	 * or other dramatic side effects? */
 	if (reg == IDX_IO_PLAY_SOUNDFORMAT) /* only do it for playback */
-		outw(inw(chip->codec_port + IDX_IO_PLAY_FLAGS)|DMA_PLAY_SOMETHING1|DMA_PLAY_SOMETHING2|SOMETHING_ALMOST_ALWAYS_SET|DMA_EPILOGUE_SOMETHING|DMA_SOMETHING_ELSE, chip->codec_port + IDX_IO_PLAY_FLAGS);
+		snd_azf3328_codec_outw(chip, IDX_IO_PLAY_FLAGS,
+			snd_azf3328_codec_inw(chip, IDX_IO_PLAY_FLAGS) |
+			DMA_PLAY_SOMETHING1 |
+			DMA_PLAY_SOMETHING2 |
+			SOMETHING_ALMOST_ALWAYS_SET |
+			DMA_EPILOGUE_SOMETHING |
+			DMA_SOMETHING_ELSE
+		);
 
 	spin_unlock_irqrestore(&chip->reg_lock, flags);
 	snd_azf3328_dbgcallleave();
 }
 
-static void snd_azf3328_setdmaa(azf3328_t *chip,
+static void
+snd_azf3328_setdmaa(azf3328_t *chip,
 				long unsigned int addr,
                                 unsigned int count,
                                 unsigned int size,
 				int do_recording)
 {
-	long unsigned int addr1;
-	long unsigned int addr2;
-	unsigned int count1;
-	unsigned int count2;
-	unsigned long flags;
-	int reg_offs = do_recording ? 0x20 : 0x00;
+	unsigned long flags, portbase;
+	unsigned int is_running;
 
 	snd_azf3328_dbgcallenter();
+	if (do_recording)
+	{
+		/* access capture registers, i.e. skip playback reg section */
+		portbase = chip->codec_port + 0x20;
+		is_running = chip->is_recording;
+	}
+	else
+	{
+		/* access the playback register section */
+		portbase = chip->codec_port + 0x00;
+		is_running = chip->is_playing;
+	}
+
 	/* AZF3328 uses a two buffer pointer DMA playback approach */
-	if (!chip->is_playing)
+	if (!is_running)
 	{
-		addr1 = addr;
-		addr2 = addr+(size/2);
-		count1 = (size/2)-1;
-		count2 = (size/2)-1;
-#if DEBUG_PLAY_REC
-		snd_azf3328_dbgplay("setting dma: buf1 %08lx[%d], buf2 %08lx[%d]\n", addr1, count1, addr2, count2);
-#endif
+		unsigned long addr_area2;
+		unsigned long count_areas, count_tmp; /* width 32bit -- overflow!! */
+		count_areas = size/2;
+		addr_area2 = addr+count_areas;
+		count_areas--; /* max. index */
+		snd_azf3328_dbgplay("set DMA: buf1 %08lx[%lu], buf2 %08lx[%lu]\n", addr, count_areas, addr_area2, count_areas);
+
+		/* build combined I/O buffer length word */
+		count_tmp = count_areas;
+		count_areas |= (count_tmp << 16);
 		spin_lock_irqsave(&chip->reg_lock, flags);
-		outl(addr1, chip->codec_port+reg_offs+IDX_IO_PLAY_DMA_START_1);
-		outl(addr2, chip->codec_port+reg_offs+IDX_IO_PLAY_DMA_START_2);
-		outw(count1, chip->codec_port+reg_offs+IDX_IO_PLAY_DMA_LEN_1);
-		outw(count2, chip->codec_port+reg_offs+IDX_IO_PLAY_DMA_LEN_2);
+		outl(addr, portbase + IDX_IO_PLAY_DMA_START_1);
+		outl(addr_area2, portbase + IDX_IO_PLAY_DMA_START_2);
+		outl(count_areas, portbase + IDX_IO_PLAY_DMA_LEN_1);
 		spin_unlock_irqrestore(&chip->reg_lock, flags);
 	}
 	snd_azf3328_dbgcallleave();
 }
 
-static int snd_azf3328_playback_prepare(snd_pcm_substream_t *substream)
+static int
+snd_azf3328_playback_prepare(snd_pcm_substream_t *substream)
 {
 #if 0
 	azf3328_t *chip = snd_pcm_substream_chip(substream);
@@ -752,14 +853,18 @@ static int snd_azf3328_playback_prepare(snd_pcm_substream_t *substream)
 
 	snd_azf3328_dbgcallenter();
 #if 0
-	snd_azf3328_setfmt(chip, IDX_IO_PLAY_SOUNDFORMAT, runtime->rate, snd_pcm_format_width(runtime->format), runtime->channels);
+	snd_azf3328_setfmt(chip, IDX_IO_PLAY_SOUNDFORMAT,
+		runtime->rate,
+		snd_pcm_format_width(runtime->format),
+		runtime->channels);
 	snd_azf3328_setdmaa(chip, runtime->dma_addr, count, size, 0);
 #endif
 	snd_azf3328_dbgcallleave();
 	return 0;
 }
 
-static int snd_azf3328_capture_prepare(snd_pcm_substream_t * substream)
+static int
+snd_azf3328_capture_prepare(snd_pcm_substream_t * substream)
 {
 #if 0
 	azf3328_t *chip = snd_pcm_substream_chip(substream);
@@ -770,14 +875,18 @@ static int snd_azf3328_capture_prepare(snd_pcm_substream_t * substream)
 
 	snd_azf3328_dbgcallenter();
 #if 0
-	snd_azf3328_setfmt(chip, IDX_IO_REC_SOUNDFORMAT, runtime->rate, snd_pcm_format_width(runtime->format), runtime->channels);
+	snd_azf3328_setfmt(chip, IDX_IO_REC_SOUNDFORMAT,
+		runtime->rate,
+		snd_pcm_format_width(runtime->format),
+		runtime->channels);
 	snd_azf3328_setdmaa(chip, runtime->dma_addr, count, size, 1);
 #endif
 	snd_azf3328_dbgcallleave();
 	return 0;
 }
 
-static int snd_azf3328_playback_trigger(snd_pcm_substream_t * substream, int cmd)
+static int
+snd_azf3328_playback_trigger(snd_pcm_substream_t * substream, int cmd)
 {
 	azf3328_t *chip = snd_pcm_substream_chip(substream);
 	snd_pcm_runtime_t *runtime = substream->runtime;
@@ -785,73 +894,92 @@ static int snd_azf3328_playback_trigger(snd_pcm_substream_t * substream, int cmd
 	unsigned int status1;
 
 	snd_azf3328_dbgcalls("snd_azf3328_playback_trigger cmd %d\n", cmd);
+
 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
-
-		snd_azf3328_dbgio(chip, "trigger1");
+		snd_azf3328_dbgplay("START PLAYBACK\n");
 
 		/* mute WaveOut */
 		snd_azf3328_mixer_set_mute(chip, IDX_MIXER_WAVEOUT, 1);
 
-		snd_azf3328_setfmt(chip, IDX_IO_PLAY_SOUNDFORMAT, runtime->rate, snd_pcm_format_width(runtime->format), runtime->channels);
+		snd_azf3328_setfmt(chip, IDX_IO_PLAY_SOUNDFORMAT,
+			runtime->rate,
+			snd_pcm_format_width(runtime->format),
+			runtime->channels);
 
 		spin_lock(&chip->reg_lock);
 		/* stop playback */
-		status1 = inw(chip->codec_port+IDX_IO_PLAY_FLAGS);
+		status1 = snd_azf3328_codec_inw(chip, IDX_IO_PLAY_FLAGS);
 		status1 &= ~DMA_RESUME;
-		outw(status1, chip->codec_port+IDX_IO_PLAY_FLAGS);
+		snd_azf3328_codec_outw(chip, IDX_IO_PLAY_FLAGS, status1);
 	    
 		/* FIXME: clear interrupts or what??? */
-		outw(0xffff, chip->codec_port+IDX_IO_PLAY_IRQMASK);
+		snd_azf3328_codec_outw(chip, IDX_IO_PLAY_IRQTYPE, 0xffff);
 		spin_unlock(&chip->reg_lock);
 
-		snd_azf3328_setdmaa(chip, runtime->dma_addr, snd_pcm_lib_period_bytes(substream), snd_pcm_lib_buffer_bytes(substream), 0);
+		snd_azf3328_setdmaa(chip, runtime->dma_addr,
+			snd_pcm_lib_period_bytes(substream),
+			snd_pcm_lib_buffer_bytes(substream),
+			0);
 
 		spin_lock(&chip->reg_lock);
 #ifdef WIN9X
 		/* FIXME: enable playback/recording??? */
 		status1 |= DMA_PLAY_SOMETHING1 | DMA_PLAY_SOMETHING2;
-		outw(status1, chip->codec_port+IDX_IO_PLAY_FLAGS);
+		snd_azf3328_codec_outw(chip, IDX_IO_PLAY_FLAGS, status1);
 
 		/* start playback again */
 		/* FIXME: what is this value (0x0010)??? */
 		status1 |= DMA_RESUME | DMA_EPILOGUE_SOMETHING;
-		outw(status1, chip->codec_port+IDX_IO_PLAY_FLAGS);
+		snd_azf3328_codec_outw(chip, IDX_IO_PLAY_FLAGS, status1);
 #else /* NT4 */
-		outw(0x00, chip->codec_port+IDX_IO_PLAY_FLAGS);
-		outw(DMA_PLAY_SOMETHING1, chip->codec_port+IDX_IO_PLAY_FLAGS);
-		outw(DMA_PLAY_SOMETHING1|DMA_PLAY_SOMETHING2, chip->codec_port+IDX_IO_PLAY_FLAGS);
-		outw(DMA_RESUME|SOMETHING_ALMOST_ALWAYS_SET|DMA_EPILOGUE_SOMETHING|DMA_SOMETHING_ELSE, chip->codec_port+IDX_IO_PLAY_FLAGS);
+		snd_azf3328_codec_outw(chip, IDX_IO_PLAY_FLAGS,
+			0x0000);
+		snd_azf3328_codec_outw(chip, IDX_IO_PLAY_FLAGS,
+			DMA_PLAY_SOMETHING1);
+		snd_azf3328_codec_outw(chip, IDX_IO_PLAY_FLAGS,
+			DMA_PLAY_SOMETHING1 |
+			DMA_PLAY_SOMETHING2);
+		snd_azf3328_codec_outw(chip, IDX_IO_PLAY_FLAGS,
+			DMA_RESUME |
+			SOMETHING_ALMOST_ALWAYS_SET |
+			DMA_EPILOGUE_SOMETHING |
+			DMA_SOMETHING_ELSE);
 #endif
 		spin_unlock(&chip->reg_lock);
 
 		/* now unmute WaveOut */
 		snd_azf3328_mixer_set_mute(chip, IDX_MIXER_WAVEOUT, 0);
 
-		snd_azf3328_dbgio(chip, "trigger2");
 		chip->is_playing = 1;
+		snd_azf3328_dbgplay("STARTED PLAYBACK\n");
 		break;
-        case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_STOP:
+		snd_azf3328_dbgplay("STOP PLAYBACK\n");
+
 		/* mute WaveOut */
 		snd_azf3328_mixer_set_mute(chip, IDX_MIXER_WAVEOUT, 1);
 
 		spin_lock(&chip->reg_lock);
 		/* stop playback */
-		status1 = inw(chip->codec_port+IDX_IO_PLAY_FLAGS);
+		status1 = snd_azf3328_codec_inw(chip, IDX_IO_PLAY_FLAGS);
 
 		status1 &= ~DMA_RESUME;
-		outw(status1, chip->codec_port+IDX_IO_PLAY_FLAGS);
+		snd_azf3328_codec_outw(chip, IDX_IO_PLAY_FLAGS, status1);
 
+		/* hmm, is this really required? we're resetting the same bit
+		 * immediately thereafter... */
 		status1 |= DMA_PLAY_SOMETHING1;
-		outw(status1, chip->codec_port+IDX_IO_PLAY_FLAGS);
+		snd_azf3328_codec_outw(chip, IDX_IO_PLAY_FLAGS, status1);
 
 		status1 &= ~DMA_PLAY_SOMETHING1;
-		outw(status1, chip->codec_port+IDX_IO_PLAY_FLAGS);
+		snd_azf3328_codec_outw(chip, IDX_IO_PLAY_FLAGS, status1);
 		spin_unlock(&chip->reg_lock);
 	    
 		/* now unmute WaveOut */
 		snd_azf3328_mixer_set_mute(chip, IDX_MIXER_WAVEOUT, 0);
 		chip->is_playing = 0;
+		snd_azf3328_dbgplay("STOPPED PLAYBACK\n");
 		break;
         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 		snd_printk(KERN_ERR "FIXME: SNDRV_PCM_TRIGGER_PAUSE_PUSH NIY!\n");
@@ -869,7 +997,8 @@ static int snd_azf3328_playback_trigger(snd_pcm_substream_t * substream, int cmd
 
 /* this is just analogous to playback; I'm not quite sure whether recording
  * should actually be triggered like that */
-static int snd_azf3328_capture_trigger(snd_pcm_substream_t * substream, int cmd)
+static int
+snd_azf3328_capture_trigger(snd_pcm_substream_t * substream, int cmd)
 {
 	azf3328_t *chip = snd_pcm_substream_chip(substream);
 	snd_pcm_runtime_t *runtime = substream->runtime;
@@ -877,62 +1006,80 @@ static int snd_azf3328_capture_trigger(snd_pcm_substream_t * substream, int cmd)
 	unsigned int status1;
 
 	snd_azf3328_dbgcalls("snd_azf3328_capture_trigger cmd %d\n", cmd);
+
         switch (cmd) {
         case SNDRV_PCM_TRIGGER_START:
 
-		snd_azf3328_dbgio(chip, "trigger1");
+		snd_azf3328_dbgplay("START CAPTURE\n");
 
-		snd_azf3328_setfmt(chip, IDX_IO_REC_SOUNDFORMAT, runtime->rate, snd_pcm_format_width(runtime->format), runtime->channels);
+		snd_azf3328_setfmt(chip, IDX_IO_REC_SOUNDFORMAT,
+			runtime->rate,
+			snd_pcm_format_width(runtime->format),
+			runtime->channels);
 
 		spin_lock(&chip->reg_lock);
 		/* stop recording */
-		status1 = inw(chip->codec_port+IDX_IO_REC_FLAGS);
+		status1 = snd_azf3328_codec_inw(chip, IDX_IO_REC_FLAGS);
 		status1 &= ~DMA_RESUME;
-		outw(status1, chip->codec_port+IDX_IO_REC_FLAGS);
+		snd_azf3328_codec_outw(chip, IDX_IO_REC_FLAGS, status1);
 	    
 		/* FIXME: clear interrupts or what??? */
-		outw(0xffff, chip->codec_port+IDX_IO_REC_IRQMASK);
+		snd_azf3328_codec_outw(chip, IDX_IO_REC_IRQTYPE, 0xffff);
 		spin_unlock(&chip->reg_lock);
 
-		snd_azf3328_setdmaa(chip, runtime->dma_addr, snd_pcm_lib_period_bytes(substream), snd_pcm_lib_buffer_bytes(substream), 1);
+		snd_azf3328_setdmaa(chip, runtime->dma_addr,
+			snd_pcm_lib_period_bytes(substream),
+			snd_pcm_lib_buffer_bytes(substream),
+			1);
 
 		spin_lock(&chip->reg_lock);
 #ifdef WIN9X
 		/* FIXME: enable playback/recording??? */
 		status1 |= DMA_PLAY_SOMETHING1 | DMA_PLAY_SOMETHING2;
-		outw(status1, chip->codec_port+IDX_IO_REC_FLAGS);
+		snd_azf3328_codec_outw(chip, IDX_IO_REC_FLAGS, status1);
 
-		/* start playback again */
+		/* start capture again */
 		/* FIXME: what is this value (0x0010)??? */
 		status1 |= DMA_RESUME | DMA_EPILOGUE_SOMETHING;
-		outw(status1, chip->codec_port+IDX_IO_REC_FLAGS);
+		snd_azf3328_codec_outw(chip, IDX_IO_REC_FLAGS, status1);
 #else
-		outw(0x00, chip->codec_port+IDX_IO_REC_FLAGS);
-		outw(DMA_PLAY_SOMETHING1, chip->codec_port+IDX_IO_REC_FLAGS);
-		outw(DMA_PLAY_SOMETHING1|DMA_PLAY_SOMETHING2, chip->codec_port+IDX_IO_REC_FLAGS);
-		outw(DMA_RESUME|SOMETHING_ALMOST_ALWAYS_SET|DMA_EPILOGUE_SOMETHING|DMA_SOMETHING_ELSE, chip->codec_port+IDX_IO_REC_FLAGS);
+		snd_azf3328_codec_outw(chip, IDX_IO_REC_FLAGS,
+			0x0000);
+		snd_azf3328_codec_outw(chip, IDX_IO_REC_FLAGS,
+			DMA_PLAY_SOMETHING1);
+		snd_azf3328_codec_outw(chip, IDX_IO_REC_FLAGS,
+			DMA_PLAY_SOMETHING1 |
+			DMA_PLAY_SOMETHING2);
+		snd_azf3328_codec_outw(chip, IDX_IO_REC_FLAGS,
+			DMA_RESUME |
+			SOMETHING_ALMOST_ALWAYS_SET |
+			DMA_EPILOGUE_SOMETHING |
+			DMA_SOMETHING_ELSE);
 #endif
 		spin_unlock(&chip->reg_lock);
 
-		snd_azf3328_dbgio(chip, "trigger2");
-		chip->is_playing = 1;
+		chip->is_recording = 1;
+		snd_azf3328_dbgplay("STARTED CAPTURE\n");
 		break;
         case SNDRV_PCM_TRIGGER_STOP:
+		snd_azf3328_dbgplay("STOP CAPTURE\n");
+
 		spin_lock(&chip->reg_lock);
 		/* stop recording */
-		status1 = inw(chip->codec_port+IDX_IO_REC_FLAGS);
+		status1 = snd_azf3328_codec_inw(chip, IDX_IO_REC_FLAGS);
 
 		status1 &= ~DMA_RESUME;
-		outw(status1, chip->codec_port+IDX_IO_REC_FLAGS);
+		snd_azf3328_codec_outw(chip, IDX_IO_REC_FLAGS, status1);
 
 		status1 |= DMA_PLAY_SOMETHING1;
-		outw(status1, chip->codec_port+IDX_IO_REC_FLAGS);
+		snd_azf3328_codec_outw(chip, IDX_IO_REC_FLAGS, status1);
 
 		status1 &= ~DMA_PLAY_SOMETHING1;
-		outw(status1, chip->codec_port+IDX_IO_REC_FLAGS);
+		snd_azf3328_codec_outw(chip, IDX_IO_REC_FLAGS, status1);
 		spin_unlock(&chip->reg_lock);
 	    
-		chip->is_playing = 0;
+		chip->is_recording = 0;
+		snd_azf3328_dbgplay("STOPPED CAPTURE\n");
 		break;
         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 		snd_printk(KERN_ERR "FIXME: SNDRV_PCM_TRIGGER_PAUSE_PUSH NIY!\n");
@@ -948,11 +1095,11 @@ static int snd_azf3328_capture_trigger(snd_pcm_substream_t * substream, int cmd)
 	return result;
 }
 
-static snd_pcm_uframes_t snd_azf3328_playback_pointer(snd_pcm_substream_t * substream)
+static snd_pcm_uframes_t
+snd_azf3328_playback_pointer(snd_pcm_substream_t * substream)
 {
 	azf3328_t *chip = snd_pcm_substream_chip(substream);
-	unsigned long bufptr, playptr;
-	unsigned long result;
+	unsigned long bufptr, result;
 	snd_pcm_uframes_t frmres;
 
 #ifdef QUERY_HARDWARE
@@ -960,19 +1107,20 @@ static snd_pcm_uframes_t snd_azf3328_playback_pointer(snd_pcm_substream_t * subs
 #else
 	bufptr = substream->runtime->dma_addr;
 #endif
-	playptr = inl(chip->codec_port+IDX_IO_PLAY_DMA_CURRPOS);
+	result = inl(chip->codec_port+IDX_IO_PLAY_DMA_CURRPOS);
 
-	result = playptr - bufptr;
-	frmres = bytes_to_frames( substream->runtime, result );
-	snd_azf3328_dbgplay("result %lx, playptr %lx (base %x), frames %ld\n", result, playptr, substream->runtime->dma_addr, frmres);
+	/* calculate offset */
+	result -= bufptr;
+	frmres = bytes_to_frames( substream->runtime, result);
+	snd_azf3328_dbgplay("PLAY @ 0x%8lx, frames %8ld\n", result, frmres);
 	return frmres;
 }
 
-static snd_pcm_uframes_t snd_azf3328_capture_pointer(snd_pcm_substream_t * substream)
+static snd_pcm_uframes_t
+snd_azf3328_capture_pointer(snd_pcm_substream_t * substream)
 {
 	azf3328_t *chip = snd_pcm_substream_chip(substream);
-	unsigned long bufptr, recptr;
-	unsigned long result;
+	unsigned long bufptr, result;
 	snd_pcm_uframes_t frmres;
 
 #ifdef QUERY_HARDWARE
@@ -980,96 +1128,116 @@ static snd_pcm_uframes_t snd_azf3328_capture_pointer(snd_pcm_substream_t * subst
 #else
 	bufptr = substream->runtime->dma_addr;
 #endif
-	recptr = inl(chip->codec_port+IDX_IO_REC_DMA_CURRPOS);
+	result = inl(chip->codec_port+IDX_IO_REC_DMA_CURRPOS);
 
-	result = recptr - bufptr;
-	frmres = bytes_to_frames( substream->runtime, result );
-	snd_azf3328_dbgplay("result %lx, rec ptr %lx (base %x), frames %ld\n", result, recptr, substream->runtime->dma_addr, frmres);
+	/* calculate offset */
+	result -= bufptr;
+	frmres = bytes_to_frames( substream->runtime, result);
+	snd_azf3328_dbgplay("REC  @ 0x%8lx, frames %8ld\n", result, frmres);
 	return frmres;
 }
 
-static irqreturn_t snd_azf3328_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+static irqreturn_t
+snd_azf3328_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 {
 	azf3328_t *chip = dev_id;
-	unsigned int status, which;
-	static unsigned long count;
+	u8 status, which;
+	static unsigned long irq_count;
 
-	status  = inw(chip->codec_port+IDX_IO_IRQSTATUS);
+	status = snd_azf3328_codec_inb(chip, IDX_IO_IRQSTATUS);
 
         /* fast path out, to ease interrupt sharing */
-	if (!(status & (IRQ_PLAYBACK|IRQ_RECORDING|IRQ_MPU401|IRQ_SOMEIRQ)))
+	if (!(status & (IRQ_PLAYBACK|IRQ_RECORDING|IRQ_MPU401|IRQ_TIMER)))
 		return IRQ_NONE; /* must be interrupt for another device */
 
-	snd_azf3328_dbgplay("Interrupt %ld!\nIDX_IO_PLAY_FLAGS %04x, IDX_IO_PLAY_IRQMASK %04x, IDX_IO_IRQSTATUS %04x\n", count, inw(chip->codec_port+IDX_IO_PLAY_FLAGS), inw(chip->codec_port+IDX_IO_PLAY_IRQMASK), inw(chip->codec_port+IDX_IO_IRQSTATUS));
+	snd_azf3328_dbgplay("Interrupt %ld!\nIDX_IO_PLAY_FLAGS %04x, IDX_IO_PLAY_IRQTYPE %04x, IDX_IO_IRQSTATUS %04x\n",
+		irq_count,
+		snd_azf3328_codec_inw(chip, IDX_IO_PLAY_FLAGS),
+		snd_azf3328_codec_inw(chip, IDX_IO_PLAY_IRQTYPE),
+		status);
 		
+	if (status & IRQ_TIMER)
+	{
+		/* snd_azf3328_dbgplay("timer %ld\n", inl(chip->codec_port+IDX_IO_TIMER_VALUE) & TIMER_VALUE_MASK); */
+		if (chip->timer)
+			snd_timer_interrupt(chip->timer, chip->timer->sticks);
+		/* ACK timer */
+                spin_lock(&chip->reg_lock);
+		snd_azf3328_codec_outb(chip, IDX_IO_TIMER_VALUE + 3, 0x07);
+		spin_unlock(&chip->reg_lock);
+		snd_azf3328_dbgplay("azt3328: timer IRQ\n");
+	}
 	if (status & IRQ_PLAYBACK)
 	{
 		spin_lock(&chip->reg_lock);
-		which = inw(chip->codec_port+IDX_IO_PLAY_IRQMASK);
-		if (which & IRQ_FINISHED_PLAYBUF_1)
-			/* ack IRQ */
-			outw(which | IRQ_FINISHED_PLAYBUF_1, chip->codec_port+IDX_IO_PLAY_IRQMASK);
-		if (which & IRQ_FINISHED_PLAYBUF_2)
-			/* ack IRQ */
-			outw(which | IRQ_FINISHED_PLAYBUF_2, chip->codec_port+IDX_IO_PLAY_IRQMASK);
-		if (which & IRQ_PLAY_SOMETHING)
-		{
-			snd_azf3328_dbgplay("azt3328: unknown play IRQ type occurred, please report!\n");
-		}
+		which = snd_azf3328_codec_inb(chip, IDX_IO_PLAY_IRQTYPE);
+		/* ack all IRQ types immediately */
+		snd_azf3328_codec_outb(chip, IDX_IO_PLAY_IRQTYPE, which);
+               	spin_unlock(&chip->reg_lock);
+
 		if (chip->pcm && chip->playback_substream)
 		{
-			snd_azf3328_dbgplay("which %x, playptr %lx\n", which, inl(chip->codec_port+IDX_IO_PLAY_DMA_CURRPOS));
 			snd_pcm_period_elapsed(chip->playback_substream);
-			snd_azf3328_dbgplay("period done, playptr %lx.\n", inl(chip->codec_port+IDX_IO_PLAY_DMA_CURRPOS));
+			snd_azf3328_dbgplay("PLAY period done (#%x), @ %x\n",
+				which,
+				inl(chip->codec_port+IDX_IO_PLAY_DMA_CURRPOS));
 		}
 		else
 			snd_azf3328_dbgplay("azt3328: ouch, irq handler problem!\n");
-               	spin_unlock(&chip->reg_lock);
+		if (which & IRQ_PLAY_SOMETHING)
+			snd_azf3328_dbgplay("azt3328: unknown play IRQ type occurred, please report!\n");
 	}
 	if (status & IRQ_RECORDING)
 	{
                 spin_lock(&chip->reg_lock);
-		which = inw(chip->codec_port+IDX_IO_REC_IRQMASK);
-		if (which & IRQ_FINISHED_RECBUF_1)
-			/* ack interrupt */
-			outw(which | IRQ_FINISHED_RECBUF_1, chip->codec_port+IDX_IO_REC_IRQMASK);
-		if (which & IRQ_FINISHED_RECBUF_2)
-			/* ack interrupt */
-			outw(which | IRQ_FINISHED_RECBUF_2, chip->codec_port+IDX_IO_REC_IRQMASK);
-		if (which & IRQ_REC_SOMETHING)
-		{
-			snd_azf3328_dbgplay("azt3328: unknown rec IRQ type occurred, please report!\n");
-		}
+		which = snd_azf3328_codec_inb(chip, IDX_IO_REC_IRQTYPE);
+		/* ack all IRQ types immediately */
+		snd_azf3328_codec_outb(chip, IDX_IO_REC_IRQTYPE, which);
+		spin_unlock(&chip->reg_lock);
+
 		if (chip->pcm && chip->capture_substream)
 		{
-			snd_azf3328_dbgplay("which %x, recptr %lx\n", which, inl(chip->codec_port+IDX_IO_REC_DMA_CURRPOS));
-			spin_unlock(&chip->reg_lock);
 			snd_pcm_period_elapsed(chip->capture_substream);
-			spin_lock(&chip->reg_lock);
-			snd_azf3328_dbgplay("period done, recptr %lx.\n", inl(chip->codec_port+IDX_IO_REC_DMA_CURRPOS));
+			snd_azf3328_dbgplay("REC  period done (#%x), @ %x\n",
+				which,
+				inl(chip->codec_port+IDX_IO_REC_DMA_CURRPOS));
 		}
-               	spin_unlock(&chip->reg_lock);
+		else
+			snd_azf3328_dbgplay("azt3328: ouch, irq handler problem!\n");
+		if (which & IRQ_REC_SOMETHING)
+			snd_azf3328_dbgplay("azt3328: unknown rec IRQ type occurred, please report!\n");
 	}
+	/* MPU401 has less critical IRQ requirements
+	 * than timer and playback/recording, right? */
 	if (status & IRQ_MPU401)
+	{
 		snd_mpu401_uart_interrupt(irq, chip->rmidi->private_data, regs);
-	if (status & IRQ_SOMEIRQ)
-		snd_azf3328_dbgplay("azt3328: unknown IRQ type occurred, please report!\n");
-	count++;
+
+		/* hmm, do we have to ack the IRQ here somehow?
+		 * If so, then I don't know how... */
+		snd_azf3328_dbgplay("azt3328: MPU401 IRQ\n");
+	}
+	irq_count++;
 	return IRQ_HANDLED;
 }
 
 /*****************************************************************/
 
-static snd_pcm_hardware_t snd_azf3328_playback =
+static const snd_pcm_hardware_t snd_azf3328_playback =
 {
 	/* FIXME!! Correct? */
-	.info =			(SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
-				 SNDRV_PCM_INFO_MMAP_VALID),
-	.formats =		SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U8 |
-				SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_U16_LE,
-	.rates =		SNDRV_PCM_RATE_8000_48000 | SNDRV_PCM_RATE_64000 | SNDRV_PCM_RATE_KNOT,
-	.rate_min =		5512,
-	.rate_max =		64000,
+	.info =			SNDRV_PCM_INFO_MMAP |
+				SNDRV_PCM_INFO_INTERLEAVED |
+				SNDRV_PCM_INFO_MMAP_VALID,
+	.formats =		SNDRV_PCM_FMTBIT_S8 |
+				SNDRV_PCM_FMTBIT_U8 |
+				SNDRV_PCM_FMTBIT_S16_LE |
+				SNDRV_PCM_FMTBIT_U16_LE,
+	.rates =		SNDRV_PCM_RATE_5512 |
+				SNDRV_PCM_RATE_8000_48000 |
+				SNDRV_PCM_RATE_KNOT,
+	.rate_min =		4000,
+	.rate_max =		66200,
 	.channels_min =		1,
 	.channels_max =		2,
 	.buffer_bytes_max =	65536,
@@ -1083,16 +1251,21 @@ static snd_pcm_hardware_t snd_azf3328_playback =
 	.fifo_size =		0,
 };
 
-static snd_pcm_hardware_t snd_azf3328_capture =
+static const snd_pcm_hardware_t snd_azf3328_capture =
 {
 	/* FIXME */
-	.info =			(SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
-				 SNDRV_PCM_INFO_MMAP_VALID),
-	.formats =		SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U8 |
-				SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_U16_LE,
-	.rates =		SNDRV_PCM_RATE_8000_48000 | SNDRV_PCM_RATE_64000 | SNDRV_PCM_RATE_KNOT,
-	.rate_min =		5512,
-	.rate_max =		64000,
+	.info =			SNDRV_PCM_INFO_MMAP |
+				SNDRV_PCM_INFO_INTERLEAVED |
+				SNDRV_PCM_INFO_MMAP_VALID,
+	.formats =		SNDRV_PCM_FMTBIT_S8 |
+				SNDRV_PCM_FMTBIT_U8 |
+				SNDRV_PCM_FMTBIT_S16_LE |
+				SNDRV_PCM_FMTBIT_U16_LE,
+	.rates =		SNDRV_PCM_RATE_5512 |
+				SNDRV_PCM_RATE_8000_48000 |
+				SNDRV_PCM_RATE_KNOT,
+	.rate_min =		4000,
+	.rate_max =		66200,
 	.channels_min =		1,
 	.channels_max =		2,
 	.buffer_bytes_max =	65536,
@@ -1105,8 +1278,8 @@ static snd_pcm_hardware_t snd_azf3328_capture =
 
 
 static unsigned int snd_azf3328_fixed_rates[] = {
-	5512, 6620, 8000, 9600, 11025, 16000, 22050, 32000, 44100, 48000, 64000
-};
+	4000, 4800, 5512, 6620, 8000, 9600, 11025, 13240, 16000, 22050, 32000,
+	44100, 48000, 66200 };
 static snd_pcm_hw_constraint_list_t snd_azf3328_hw_constraints_rates = {
 	.count = ARRAY_SIZE(snd_azf3328_fixed_rates), 
 	.list = snd_azf3328_fixed_rates,
@@ -1115,7 +1288,8 @@ static snd_pcm_hw_constraint_list_t snd_azf3328_hw_constraints_rates = {
 
 /*****************************************************************/
 
-static int snd_azf3328_playback_open(snd_pcm_substream_t * substream)
+static int
+snd_azf3328_playback_open(snd_pcm_substream_t * substream)
 {
 	azf3328_t *chip = snd_pcm_substream_chip(substream);
 	snd_pcm_runtime_t *runtime = substream->runtime;
@@ -1129,7 +1303,8 @@ static int snd_azf3328_playback_open(snd_pcm_substream_t * substream)
 	return 0;
 }
 
-static int snd_azf3328_capture_open(snd_pcm_substream_t * substream)
+static int
+snd_azf3328_capture_open(snd_pcm_substream_t * substream)
 {
 	azf3328_t *chip = snd_pcm_substream_chip(substream);
 	snd_pcm_runtime_t *runtime = substream->runtime;
@@ -1143,7 +1318,8 @@ static int snd_azf3328_capture_open(snd_pcm_substream_t * substream)
 	return 0;
 }
 
-static int snd_azf3328_playback_close(snd_pcm_substream_t * substream)
+static int
+snd_azf3328_playback_close(snd_pcm_substream_t * substream)
 {
 	azf3328_t *chip = snd_pcm_substream_chip(substream);
 
@@ -1154,7 +1330,8 @@ static int snd_azf3328_playback_close(snd_pcm_substream_t * substream)
 	return 0;
 }
 
-static int snd_azf3328_capture_close(snd_pcm_substream_t * substream)
+static int
+snd_azf3328_capture_close(snd_pcm_substream_t * substream)
 {
 	azf3328_t *chip = snd_pcm_substream_chip(substream);
 
@@ -1188,14 +1365,16 @@ static snd_pcm_ops_t snd_azf3328_capture_ops = {
 	.pointer =	snd_azf3328_capture_pointer
 };
 
-static void snd_azf3328_pcm_free(snd_pcm_t *pcm)
+static void
+snd_azf3328_pcm_free(snd_pcm_t *pcm)
 {
 	azf3328_t *chip = pcm->private_data;
 	chip->pcm = NULL;
 	snd_pcm_lib_preallocate_free_for_all(pcm);
 }
 
-static int __devinit snd_azf3328_pcm(azf3328_t *chip, int device)
+static int __devinit
+snd_azf3328_pcm(azf3328_t *chip, int device)
 {
 	snd_pcm_t *pcm;
 	int err;
@@ -1222,7 +1401,8 @@ static int __devinit snd_azf3328_pcm(azf3328_t *chip, int device)
 /******************************************************************/
 
 #ifdef SUPPORT_JOYSTICK
-static int __devinit snd_azf3328_config_joystick(azf3328_t *chip, int dev)
+static int __devinit
+snd_azf3328_config_joystick(azf3328_t *chip, int dev)
 {
 	struct gameport *gp;
 	struct resource *r;
@@ -1248,15 +1428,16 @@ static int __devinit snd_azf3328_config_joystick(azf3328_t *chip, int dev)
 	gp->io = 0x200;
 	gameport_set_port_data(gp, r);
 
-	snd_azf3328_io2_write(chip, IDX_IO2_LEGACY_ADDR,
-			      snd_azf3328_io2_read(chip, IDX_IO2_LEGACY_ADDR) | LEGACY_JOY);
+	snd_azf3328_io2_outb(chip, IDX_IO2_LEGACY_ADDR,
+			      snd_azf3328_io2_inb(chip, IDX_IO2_LEGACY_ADDR) | LEGACY_JOY);
 
 	gameport_register_port(chip->gameport);
 
 	return 0;
 }
 
-static void snd_azf3328_free_joystick(azf3328_t *chip)
+static void
+snd_azf3328_free_joystick(azf3328_t *chip)
 {
 	if (chip->gameport) {
 		struct resource *r = gameport_get_port_data(chip->gameport);
@@ -1264,32 +1445,36 @@ static void snd_azf3328_free_joystick(azf3328_t *chip)
 		gameport_unregister_port(chip->gameport);
 		chip->gameport = NULL;
 		/* disable gameport */
-		snd_azf3328_io2_write(chip, IDX_IO2_LEGACY_ADDR,
-				      snd_azf3328_io2_read(chip, IDX_IO2_LEGACY_ADDR) & ~LEGACY_JOY);
+		snd_azf3328_io2_outb(chip, IDX_IO2_LEGACY_ADDR,
+				      snd_azf3328_io2_inb(chip, IDX_IO2_LEGACY_ADDR) & ~LEGACY_JOY);
 		release_and_free_resource(r);
 	}
 }
 #else
-static inline int snd_azf3328_config_joystick(azf3328_t *chip, int dev) { return -ENOSYS; }
-static inline void snd_azf3328_free_joystick(azf3328_t *chip) { }
+static inline int
+snd_azf3328_config_joystick(azf3328_t *chip, int dev) { return -ENOSYS; }
+static inline void
+snd_azf3328_free_joystick(azf3328_t *chip) { }
 #endif
 
 /******************************************************************/
 
-static int snd_azf3328_free(azf3328_t *chip)
+static int
+snd_azf3328_free(azf3328_t *chip)
 {
         if (chip->irq < 0)
                 goto __end_hw;
 
 	/* reset (close) mixer */
 	snd_azf3328_mixer_set_mute(chip, IDX_MIXER_PLAY_MASTER, 1); /* first mute master volume */
-	snd_azf3328_mixer_write(chip, IDX_MIXER_RESET, 0x0, WORD_VALUE);
+	snd_azf3328_mixer_outw(chip, IDX_MIXER_RESET, 0x0000);
 
-        /* interrupt setup - mask everything */
-	/* FIXME */
+        /* interrupt setup - mask everything (FIXME!) */
+	/* well, at least we know how to disable the timer IRQ */
+	snd_azf3328_codec_outb(chip, IDX_IO_TIMER_VALUE + 3, 0x00);
 
         synchronize_irq(chip->irq);
-      __end_hw:
+__end_hw:
 	snd_azf3328_free_joystick(chip);
         if (chip->irq >= 0)
 		free_irq(chip->irq, (void *)chip);
@@ -1300,15 +1485,129 @@ static int snd_azf3328_free(azf3328_t *chip)
         return 0;
 }
 
-static int snd_azf3328_dev_free(snd_device_t *device)
+static int
+snd_azf3328_dev_free(snd_device_t *device)
 {
 	azf3328_t *chip = device->device_data;
 	return snd_azf3328_free(chip);
 }
 
+/******************************************************************/
+
+/*** NOTE: the physical timer resolution actually is 1024000 ticks per second,
+ *** but announcing those attributes to user-space would make programs
+ *** configure the timer to a 1 tick value, resulting in an absolutely fatal
+ *** timer IRQ storm.
+ *** Thus I chose to announce a down-scaled virtual timer to the outside and
+ *** calculate real timer countdown values internally.
+ *** (the scale factor can be set via module parameter "seqtimer_scaling").
+ ***/
+
+static int
+snd_azf3328_timer_start(snd_timer_t *timer)
+{
+	azf3328_t *chip;
+	unsigned long flags;
+	unsigned int delay;
+
+	snd_azf3328_dbgcallenter();
+	chip = snd_timer_chip(timer);
+	delay = ((timer->sticks * seqtimer_scaling) - 1) & TIMER_VALUE_MASK;
+	if (delay < 49)
+	{
+		/* uhoh, that's not good, since user-space won't know about
+		 * this timing tweak
+		 * (we need to do it to avoid a lockup, though) */
+
+		snd_azf3328_dbgtimer("delay was too low (%d)!\n", delay);
+		delay = 49; /* minimum time is 49 ticks */
+	}
+	snd_azf3328_dbgtimer("setting timer countdown value %d, add COUNTDOWN|IRQ\n", delay);
+	delay |= TIMER_ENABLE_COUNTDOWN | TIMER_ENABLE_IRQ;
+	spin_lock_irqsave(&chip->reg_lock, flags);
+	snd_azf3328_codec_outl(chip, IDX_IO_TIMER_VALUE, delay);
+	spin_unlock_irqrestore(&chip->reg_lock, flags);
+	snd_azf3328_dbgcallleave();
+	return 0;
+}
+
+static int
+snd_azf3328_timer_stop(snd_timer_t *timer)
+{
+	azf3328_t *chip;
+	unsigned long flags;
+
+	snd_azf3328_dbgcallenter();
+	chip = snd_timer_chip(timer);
+	spin_lock_irqsave(&chip->reg_lock, flags);
+	/* disable timer countdown and interrupt */
+	/* FIXME: should we write TIMER_ACK_IRQ here? */
+	snd_azf3328_codec_outb(chip, IDX_IO_TIMER_VALUE + 3, 0);
+	spin_unlock_irqrestore(&chip->reg_lock, flags);
+	snd_azf3328_dbgcallleave();
+	return 0;
+}
+
+
+static int
+snd_azf3328_timer_precise_resolution(snd_timer_t *timer,
+					       unsigned long *num, unsigned long *den)
+{
+	snd_azf3328_dbgcallenter();
+	*num = 1;
+	*den = 1024000 / seqtimer_scaling;
+	snd_azf3328_dbgcallleave();
+	return 0;
+}
+
+static struct _snd_timer_hardware snd_azf3328_timer_hw = {
+	.flags = SNDRV_TIMER_HW_AUTO,
+	.resolution = 977, /* 1000000/1024000 = 0.9765625us */
+	.ticks = 1024000, /* max tick count, defined by the value register; actually it's not 1024000, but 1048576, but we don't care */
+	.start = snd_azf3328_timer_start,
+	.stop = snd_azf3328_timer_stop,
+	.precise_resolution = snd_azf3328_timer_precise_resolution,
+};
+
+static int __devinit
+snd_azf3328_timer(azf3328_t *chip, int device)
+{
+	snd_timer_t *timer = NULL;
+	snd_timer_id_t tid;
+	int err;
+
+	snd_azf3328_dbgcallenter();
+	tid.dev_class = SNDRV_TIMER_CLASS_CARD;
+	tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
+	tid.card = chip->card->number;
+	tid.device = device;
+	tid.subdevice = 0;
+
+	snd_azf3328_timer_hw.resolution *= seqtimer_scaling;
+	snd_azf3328_timer_hw.ticks /= seqtimer_scaling;
+	if ((err = snd_timer_new(chip->card, "AZF3328", &tid, &timer)) < 0) {
+		goto out;
+	}
+
+	strcpy(timer->name, "AZF3328 timer");
+	timer->private_data = chip;
+	timer->hw = snd_azf3328_timer_hw;
+
+	chip->timer = timer;
+
+	err = 0;
+
+out:
+	snd_azf3328_dbgcallleave();
+	return err;
+}
+
+/******************************************************************/
+
 #if 0
 /* check whether a bit can be modified */
-static void snd_azf3328_test_bit(unsigned int reg, int bit)
+static void
+snd_azf3328_test_bit(unsigned int reg, int bit)
 {
 	unsigned char val, valoff, valon;
 
@@ -1326,7 +1625,26 @@ static void snd_azf3328_test_bit(unsigned int reg, int bit)
 }
 #endif
 
-static int __devinit snd_azf3328_create(snd_card_t * card,
+static void
+snd_azf3328_debug_show_ports(const azf3328_t *chip)
+{
+#if DEBUG_MISC
+	u16 tmp;
+
+	snd_azf3328_dbgmisc("codec_port 0x%lx, io2_port 0x%lx, mpu_port 0x%lx, synth_port 0x%lx, mixer_port 0x%lx, irq %d\n", chip->codec_port, chip->io2_port, chip->mpu_port, chip->synth_port, chip->mixer_port, chip->irq);
+
+	snd_azf3328_dbgmisc("io2 %02x %02x %02x %02x %02x %02x\n", snd_azf3328_io2_inb(chip, 0), snd_azf3328_io2_inb(chip, 1), snd_azf3328_io2_inb(chip, 2), snd_azf3328_io2_inb(chip, 3), snd_azf3328_io2_inb(chip, 4), snd_azf3328_io2_inb(chip, 5));
+
+	for (tmp=0; tmp <= 0x01; tmp += 1)
+		snd_azf3328_dbgmisc("0x%02x: opl 0x%04x, mpu300 0x%04x, mpu310 0x%04x, mpu320 0x%04x, mpu330 0x%04x\n", tmp, inb(0x388 + tmp), inb(0x300 + tmp), inb(0x310 + tmp), inb(0x320 + tmp), inb(0x330 + tmp));
+
+	for (tmp = 0; tmp <= 0x6E; tmp += 2)
+		snd_azf3328_dbgmisc("0x%02x: 0x%04x\n", tmp, snd_azf3328_codec_inb(chip, tmp));
+#endif
+}
+
+static int __devinit
+snd_azf3328_create(snd_card_t * card,
                                          struct pci_dev *pci,
                                          unsigned long device_type,
                                          azf3328_t ** rchip)
@@ -1345,8 +1663,8 @@ static int __devinit snd_azf3328_create(snd_card_t * card,
 
 	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
 	if (chip == NULL) {
-		pci_disable_device(pci);
-		return -ENOMEM;
+		err = -ENOMEM;
+		goto out_err;
 	}
 	spin_lock_init(&chip->reg_lock);
 	chip->card = card;
@@ -1357,46 +1675,38 @@ static int __devinit snd_azf3328_create(snd_card_t * card,
 	if (pci_set_dma_mask(pci, 0x00ffffff) < 0 ||
 	    pci_set_consistent_dma_mask(pci, 0x00ffffff) < 0) {
 		snd_printk(KERN_ERR "architecture does not support 24bit PCI busmaster DMA\n");
-		pci_disable_device(pci);
-		return -ENXIO;
+		err = -ENXIO;
+		goto out_err;
 	}
 
 	if ((err = pci_request_regions(pci, "Aztech AZF3328")) < 0) {
-		kfree(chip);
-		pci_disable_device(pci);
-		return err;
+		goto out_err;
 	}
 
 	chip->codec_port = pci_resource_start(pci, 0);
-	chip->io2_port = pci_resource_start(pci, 1);
-	chip->mpu_port = pci_resource_start(pci, 2);
+	chip->io2_port   = pci_resource_start(pci, 1);
+	chip->mpu_port   = pci_resource_start(pci, 2);
 	chip->synth_port = pci_resource_start(pci, 3);
 	chip->mixer_port = pci_resource_start(pci, 4);
 
 	if (request_irq(pci->irq, snd_azf3328_interrupt, SA_INTERRUPT|SA_SHIRQ, card->shortname, (void *)chip)) {
 		snd_printk(KERN_ERR "unable to grab IRQ %d\n", pci->irq);
-		snd_azf3328_free(chip);
-		return -EBUSY;
+		err = -EBUSY;
+		goto out_err;
 	}
 	chip->irq = pci->irq;
 	pci_set_master(pci);
 	synchronize_irq(chip->irq);
 
-	snd_azf3328_dbgmisc("codec_port 0x%lx, io2_port 0x%lx, mpu_port 0x%lx, synth_port 0x%lx, mixer_port 0x%lx, irq %d\n", chip->codec_port, chip->io2_port, chip->mpu_port, chip->synth_port, chip->mixer_port, chip->irq);
-
-	snd_azf3328_dbgmisc("io2 %02x %02x %02x %02x %02x %02x\n", snd_azf3328_io2_read(chip, 0), snd_azf3328_io2_read(chip, 1), snd_azf3328_io2_read(chip, 2), snd_azf3328_io2_read(chip, 3), snd_azf3328_io2_read(chip, 4), snd_azf3328_io2_read(chip, 5));
-
-	for (tmp=0; tmp <= 0x01; tmp += 1)
-		snd_azf3328_dbgmisc("0x%02x: opl 0x%04x, mpu300 0x%04x, mpu310 0x%04x, mpu320 0x%04x, mpu330 0x%04x\n", tmp, inb(0x388 + tmp), inb(0x300 + tmp), inb(0x310 + tmp), inb(0x320 + tmp), inb(0x330 + tmp));
-
+	snd_azf3328_debug_show_ports(chip);
+	
 	if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
-		snd_azf3328_free(chip);
-		return err;
+		goto out_err;
 	}
 
 	/* create mixer interface & switches */
 	if ((err = snd_azf3328_mixer_new(chip)) < 0)
-		return err;
+		goto out_err;
 
 #if 0
 	/* set very low bitrate to reduce noise and power consumption? */
@@ -1404,22 +1714,34 @@ static int __devinit snd_azf3328_create(snd_card_t * card,
 #endif
 
 	/* standard chip init stuff */
-	spin_lock_irq(&chip->reg_lock);
-	outb(DMA_PLAY_SOMETHING2|DMA_EPILOGUE_SOMETHING|DMA_SOMETHING_ELSE, chip->codec_port + IDX_IO_PLAY_FLAGS);
-	outb(DMA_PLAY_SOMETHING2|DMA_EPILOGUE_SOMETHING|DMA_SOMETHING_ELSE, chip->codec_port + IDX_IO_SOMETHING_FLAGS);
-	outb(DMA_PLAY_SOMETHING2|DMA_EPILOGUE_SOMETHING|DMA_SOMETHING_ELSE, chip->codec_port + IDX_IO_REC_FLAGS);
-	outb(0x0, chip->codec_port + IDX_IO_IRQ63H);
+	/* default IRQ init value */
+	tmp = DMA_PLAY_SOMETHING2|DMA_EPILOGUE_SOMETHING|DMA_SOMETHING_ELSE;
 
+	spin_lock_irq(&chip->reg_lock);
+	snd_azf3328_codec_outb(chip, IDX_IO_PLAY_FLAGS, tmp);
+	snd_azf3328_codec_outb(chip, IDX_IO_REC_FLAGS, tmp);
+	snd_azf3328_codec_outb(chip, IDX_IO_SOMETHING_FLAGS, tmp);
+	snd_azf3328_codec_outb(chip, IDX_IO_TIMER_VALUE + 3, 0x00); /* disable timer */
 	spin_unlock_irq(&chip->reg_lock);
 
 	snd_card_set_dev(card, &pci->dev);
 
 	*rchip = chip;
-	return 0;
+
+	err = 0;
+	goto out;
+
+out_err:
+	if (chip)
+		snd_azf3328_free(chip);
+	pci_disable_device(pci);
+
+out:
+	return err;
 }
 
-static int __devinit snd_azf3328_probe(struct pci_dev *pci,
-					  const struct pci_device_id *pci_id)
+static int __devinit
+snd_azf3328_probe(struct pci_dev *pci, const struct pci_device_id *pci_id)
 {
 	static int dev;
 	snd_card_t *card;
@@ -1443,21 +1765,22 @@ static int __devinit snd_azf3328_probe(struct pci_dev *pci,
 	strcpy(card->shortname, "Aztech AZF3328 (PCI168)");
 
         if ((err = snd_azf3328_create(card, pci, pci_id->driver_data, &chip)) < 0) {
-		snd_card_free(card);
-		return err;
+		goto out_err;
 	}
 
 	if ((err = snd_mpu401_uart_new( card, 0, MPU401_HW_MPU401,
 				        chip->mpu_port, 1, pci->irq, 0,
 				        &chip->rmidi)) < 0) {
 		snd_printk(KERN_ERR "azf3328: no MPU-401 device at 0x%lx?\n", chip->mpu_port);
-		snd_card_free(card);
-		return err;
+		goto out_err;
+	}
+
+	if ((err = snd_azf3328_timer(chip, 0)) < 0) {
+		goto out_err;
 	}
 
 	if ((err = snd_azf3328_pcm(chip, 0)) < 0) {
-		snd_card_free(card);
-		return err;
+		goto out_err;
 	}
 
 	if (snd_opl3_create(card, chip->synth_port, chip->synth_port+2,
@@ -1466,40 +1789,46 @@ static int __devinit snd_azf3328_probe(struct pci_dev *pci,
 			   chip->synth_port, chip->synth_port+2 );
 	} else {
 		if ((err = snd_opl3_hwdep_new(opl3, 0, 1, NULL)) < 0) {
-			snd_card_free(card);
-			return err;
+			goto out_err;
 		}
 	}
 
-	snd_azf3328_dbgio(chip, "create");
-
 	sprintf(card->longname, "%s at 0x%lx, irq %i",
 		card->shortname, chip->codec_port, chip->irq);
 
 	if ((err = snd_card_register(card)) < 0) {
-		snd_card_free(card);
-		return err;
+		goto out_err;
 	}
 
 #ifdef MODULE
 	printk(
-"azt3328: Experimental driver for Aztech AZF3328-based soundcards such as PCI168.\n"
-"azt3328: ZERO support from Aztech: you might think hard about future purchase.\n"
-"azt3328: Feel free to contact hw7oshyuv3001@sneakemail.com for bug reports etc.!\n");
+"azt3328: Sound driver for Aztech AZF3328-based soundcards such as PCI168\n"
+"azt3328: (hardware was completely undocumented - ZERO support from Aztech).\n"
+"azt3328: Feel free to contact andi AT lisas.de for bug reports etc.!\n"
+"azt3328: User-scalable sequencer timer set to %dHz (1024000Hz / %d).\n",
+	1024000 / seqtimer_scaling, seqtimer_scaling);
 #endif
 
 	if (snd_azf3328_config_joystick(chip, dev) < 0)
-		snd_azf3328_io2_write(chip, IDX_IO2_LEGACY_ADDR,
-			      snd_azf3328_io2_read(chip, IDX_IO2_LEGACY_ADDR) & ~LEGACY_JOY);
+		snd_azf3328_io2_outb(chip, IDX_IO2_LEGACY_ADDR,
+			      snd_azf3328_io2_inb(chip, IDX_IO2_LEGACY_ADDR) & ~LEGACY_JOY);
 
 	pci_set_drvdata(pci, card);
 	dev++;
 
+	err = 0;
+	goto out;
+	
+out_err:
+	snd_card_free(card);
+	
+out:
 	snd_azf3328_dbgcallleave();
-	return 0;
+	return err;
 }
 
-static void __devexit snd_azf3328_remove(struct pci_dev *pci)
+static void __devexit
+snd_azf3328_remove(struct pci_dev *pci)
 {
 	snd_azf3328_dbgcallenter();
 	snd_card_free(pci_get_drvdata(pci));
@@ -1515,7 +1844,8 @@ static struct pci_driver driver = {
 	.remove = __devexit_p(snd_azf3328_remove),
 };
 
-static int __init alsa_card_azf3328_init(void)
+static int __init
+alsa_card_azf3328_init(void)
 {
 	int err;
 	snd_azf3328_dbgcallenter();
@@ -1524,7 +1854,8 @@ static int __init alsa_card_azf3328_init(void)
 	return err;
 }
 
-static void __exit alsa_card_azf3328_exit(void)
+static void __exit
+alsa_card_azf3328_exit(void)
 {
 	snd_azf3328_dbgcallenter();
 	pci_unregister_driver(&driver);
diff --git a/sound/pci/azt3328.h b/sound/pci/azt3328.h
index 7e0e791..f489bda 100644
--- a/sound/pci/azt3328.h
+++ b/sound/pci/azt3328.h
@@ -1,19 +1,17 @@
-#ifndef __SOUND_AZF3328_H
-#define __SOUND_AZF3328_H
+#ifndef __SOUND_AZT3328_H
+#define __SOUND_AZT3328_H
 
-/* type argument to use for the I/O functions */
-#define WORD_VALUE      0x1000
-#define DWORD_VALUE     0x2000
-#define BYTE_VALUE      0x4000
+/* "PU" == "power-up value", as tested on PCI168 PCI rev. 10 */
 
 /*** main I/O area port indices ***/
 /* (only 0x70 of 0x80 bytes saved/restored by Windows driver) */
-/* the driver initialisation suggests a layout of 3 main areas:
- * from 0x00 (playback), from 0x20 (recording) and from 0x40 (maybe DirectX
- * timer ???). and probably another area from 0x60 to 0x6f
- * (IRQ management, power management etc. ???). */
-/* playback area */
-#define IDX_IO_PLAY_FLAGS       0x00
+/* the driver initialisation suggests a layout of 4 main areas:
+ * from 0x00 (playback), from 0x20 (recording) and from 0x40 (maybe MPU401??).
+ * And another area from 0x60 to 0x6f (DirectX timer, IRQ management,
+ * power management etc.???). */
+
+/** playback area **/
+#define IDX_IO_PLAY_FLAGS       0x00 /* PU:0x0000 */
      /* able to reactivate output after output muting due to 8/16bit
       * output change, just like 0x0002.
       * 0x0001 is the only bit that's able to start the DMA counter */
@@ -29,7 +27,7 @@
   #define DMA_EPILOGUE_SOMETHING	0x0010
   #define DMA_SOMETHING_ELSE		0x0020 /* ??? */
   #define SOMETHING_UNMODIFIABLE	0xffc0 /* unused ? not modifiable */
-#define IDX_IO_PLAY_IRQMASK     0x02
+#define IDX_IO_PLAY_IRQTYPE     0x02 /* PU:0x0001 */
   /* write back to flags in case flags are set, in order to ACK IRQ in handler
    * (bit 1 of port 0x64 indicates interrupt for one of these three types)
    * sometimes in this case it just writes 0xffff to globally ACK all IRQs
@@ -41,36 +39,39 @@
   #define IRQMASK_SOME_STATUS_1		0x0008 /* \ related bits */
   #define IRQMASK_SOME_STATUS_2		0x0010 /* / (checked together in loop) */
   #define IRQMASK_UNMODIFIABLE		0xffe0 /* unused ? not modifiable */
-#define IDX_IO_PLAY_DMA_START_1 0x04 /* start address of 1st DMA play area */
-#define IDX_IO_PLAY_DMA_START_2 0x08 /* start address of 2nd DMA play area */
-#define IDX_IO_PLAY_DMA_LEN_1   0x0c /* length of 1st DMA play area */
-#define IDX_IO_PLAY_DMA_LEN_2   0x0e /* length of 2nd DMA play area */
-#define IDX_IO_PLAY_DMA_CURRPOS 0x10 /* current DMA position  */
-#define IDX_IO_PLAY_DMA_CURROFS	0x14 /* offset within current DMA play area */
-#define IDX_IO_PLAY_SOUNDFORMAT 0x16
+#define IDX_IO_PLAY_DMA_START_1 0x04 /* start address of 1st DMA play area, PU:0x00000000 */
+#define IDX_IO_PLAY_DMA_START_2 0x08 /* start address of 2nd DMA play area, PU:0x00000000 */
+#define IDX_IO_PLAY_DMA_LEN_1   0x0c /* length of 1st DMA play area, PU:0x0000 */
+#define IDX_IO_PLAY_DMA_LEN_2   0x0e /* length of 2nd DMA play area, PU:0x0000 */
+#define IDX_IO_PLAY_DMA_CURRPOS 0x10 /* current DMA position, PU:0x00000000 */
+#define IDX_IO_PLAY_DMA_CURROFS	0x14 /* offset within current DMA play area, PU:0x0000 */
+#define IDX_IO_PLAY_SOUNDFORMAT 0x16 /* PU:0x0010 */
   /* all unspecified bits can't be modified */
   #define SOUNDFORMAT_FREQUENCY_MASK	0x000f
+  #define SOUNDFORMAT_XTAL1		0x00
+  #define SOUNDFORMAT_XTAL2		0x01
     /* all _SUSPECTED_ values are not used by Windows drivers, so we don't
      * have any hard facts, only rough measurements */
-    #define SOUNDFORMAT_FREQ_SUSPECTED_4000	0x0c
-    #define SOUNDFORMAT_FREQ_SUSPECTED_4800	0x0a
-    #define SOUNDFORMAT_FREQ_5510		0x0d
-    #define SOUNDFORMAT_FREQ_6620		0x0b
-    #define SOUNDFORMAT_FREQ_8000		0x00 /* also 0x0e ? */
-    #define SOUNDFORMAT_FREQ_9600		0x08
-    #define SOUNDFORMAT_FREQ_SUSPECTED_12000	0x09
-    #define SOUNDFORMAT_FREQ_11025		0x01 /* also 0x0f ? */
-    #define SOUNDFORMAT_FREQ_16000		0x02
-    #define SOUNDFORMAT_FREQ_22050		0x03
-    #define SOUNDFORMAT_FREQ_32000		0x04
-    #define SOUNDFORMAT_FREQ_44100		0x05
-    #define SOUNDFORMAT_FREQ_48000		0x06
-    #define SOUNDFORMAT_FREQ_SUSPECTED_64000	0x07
+    #define SOUNDFORMAT_FREQ_SUSPECTED_4000	0x0c | SOUNDFORMAT_XTAL1
+    #define SOUNDFORMAT_FREQ_SUSPECTED_4800	0x0a | SOUNDFORMAT_XTAL1
+    #define SOUNDFORMAT_FREQ_5510		0x0c | SOUNDFORMAT_XTAL2
+    #define SOUNDFORMAT_FREQ_6620		0x0a | SOUNDFORMAT_XTAL2
+    #define SOUNDFORMAT_FREQ_8000		0x00 | SOUNDFORMAT_XTAL1 /* also 0x0e | SOUNDFORMAT_XTAL1? */
+    #define SOUNDFORMAT_FREQ_9600		0x08 | SOUNDFORMAT_XTAL1
+    #define SOUNDFORMAT_FREQ_11025		0x00 | SOUNDFORMAT_XTAL2 /* also 0x0e | SOUNDFORMAT_XTAL2? */
+    #define SOUNDFORMAT_FREQ_SUSPECTED_13240	0x08 | SOUNDFORMAT_XTAL2 /* seems to be 6620 *2 */
+    #define SOUNDFORMAT_FREQ_16000		0x02 | SOUNDFORMAT_XTAL1
+    #define SOUNDFORMAT_FREQ_22050		0x02 | SOUNDFORMAT_XTAL2
+    #define SOUNDFORMAT_FREQ_32000		0x04 | SOUNDFORMAT_XTAL1
+    #define SOUNDFORMAT_FREQ_44100		0x04 | SOUNDFORMAT_XTAL2
+    #define SOUNDFORMAT_FREQ_48000		0x06 | SOUNDFORMAT_XTAL1
+    #define SOUNDFORMAT_FREQ_SUSPECTED_66200	0x06 | SOUNDFORMAT_XTAL2 /* 66200 (13240 * 5); 64000 may have been nicer :-\ */
   #define SOUNDFORMAT_FLAG_16BIT	0x0010
   #define SOUNDFORMAT_FLAG_2CHANNELS	0x0020
-/* recording area (see also: playback bit flag definitions) */
-#define IDX_IO_REC_FLAGS	0x20 /* ?? */
-#define IDX_IO_REC_IRQMASK	0x22 /* ?? */
+
+/** recording area (see also: playback bit flag definitions) **/
+#define IDX_IO_REC_FLAGS	0x20 /* ??, PU:0x0000 */
+#define IDX_IO_REC_IRQTYPE	0x22 /* ??, PU:0x0000 */
   #define IRQ_REC_SOMETHING		0x0001 /* something & ACK */
   #define IRQ_FINISHED_RECBUF_1		0x0002 /* 1st dmabuf finished & ACK */
   #define IRQ_FINISHED_RECBUF_2		0x0004 /* 2nd dmabuf finished & ACK */
@@ -78,39 +79,47 @@
    * but OTOH they are most likely at port 0x22 instead */
   #define IRQMASK_SOME_STATUS_1		0x0008 /* \ related bits */
   #define IRQMASK_SOME_STATUS_2		0x0010 /* / (checked together in loop) */
-#define IDX_IO_REC_DMA_START_1  0x24
-#define IDX_IO_REC_DMA_START_2  0x28
-#define IDX_IO_REC_DMA_LEN_1    0x2c
-#define IDX_IO_REC_DMA_LEN_2    0x2e
-#define IDX_IO_REC_DMA_CURRPOS  0x30
-#define IDX_IO_REC_DMA_CURROFS  0x34
-#define IDX_IO_REC_SOUNDFORMAT  0x36
-/* some third area ? (after playback and recording) */
-#define IDX_IO_SOMETHING_FLAGS	0x40 /* gets set to 0x34 just like port 0x0 and 0x20 on card init */
+#define IDX_IO_REC_DMA_START_1  0x24 /* PU:0x00000000 */
+#define IDX_IO_REC_DMA_START_2  0x28 /* PU:0x00000000 */
+#define IDX_IO_REC_DMA_LEN_1    0x2c /* PU:0x0000 */
+#define IDX_IO_REC_DMA_LEN_2    0x2e /* PU:0x0000 */
+#define IDX_IO_REC_DMA_CURRPOS  0x30 /* PU:0x00000000 */
+#define IDX_IO_REC_DMA_CURROFS  0x34 /* PU:0x00000000 */
+#define IDX_IO_REC_SOUNDFORMAT  0x36 /* PU:0x0000 */
+
+/** hmm, what is this I/O area for? MPU401?? (after playback, recording, ???, timer) **/
+#define IDX_IO_SOMETHING_FLAGS	0x40 /* gets set to 0x34 just like port 0x0 and 0x20 on card init, PU:0x0000 */
 /* general */
-#define IDX_IO_60H		0x60 /* writing 0xffff returns 0xffff */
-#define IDX_IO_62H		0x62 /* writing to WORD 0x0062 can hang the box ! --> responsible for IRQ management as a whole ?? */
-#define IDX_IO_IRQ63H		0x63 /* FIXME !! */
-  #define IO_IRQ63H_SOMETHING		0x04 /* being set in IRQ handler in case port 0x00 had 0x0020 set upon IRQ handler */
+#define IDX_IO_42H		0x42 /* PU:0x0001 */
+
+/** DirectX timer, main interrupt area (FIXME: and something else?) **/ 
+#define IDX_IO_TIMER_VALUE	0x60 /* found this timer area by pure luck :-) */
+  #define TIMER_VALUE_MASK		0x000fffffUL /* timer countdown value; triggers IRQ when timer is finished */
+  #define TIMER_ENABLE_COUNTDOWN	0x01000000UL /* activate the timer countdown */
+  #define TIMER_ENABLE_IRQ		0x02000000UL /* trigger timer IRQ on zero transition */
+  #define TIMER_ACK_IRQ			0x04000000UL /* being set in IRQ handler in case port 0x00 (hmm, not port 0x64!?!?) had 0x0020 set upon IRQ handler */
 #define IDX_IO_IRQSTATUS        0x64
   #define IRQ_PLAYBACK			0x0001
   #define IRQ_RECORDING			0x0002
   #define IRQ_MPU401			0x0010
-  #define IRQ_SOMEIRQ			0x0020 /* ???? */
-  #define IRQ_WHO_KNOWS_UNUSED		0x00e0 /* probably unused */
+  #define IRQ_TIMER			0x0020 /* DirectX timer */
+  #define IRQ_UNKNOWN1			0x0040 /* probably unused */
+  #define IRQ_UNKNOWN2			0x0080 /* probably unused */
 #define IDX_IO_66H		0x66    /* writing 0xffff returns 0x0000 */
-#define IDX_IO_SOME_VALUE	0x68	/* this is always set to 0x3ff, and writable; maybe some buffer limit, but I couldn't find out more */
-#define IDX_IO_6AH		0x6A	/* this WORD can be set to have bits 0x0028 activated; actually inhibits PCM playback !!! maybe power management ?? */
-#define IDX_IO_6CH		0x6C	/* this WORD can have all its bits activated ? */
+#define IDX_IO_SOME_VALUE	0x68	/* this is set to e.g. 0x3ff or 0x300, and writable; maybe some buffer limit, but I couldn't find out more, PU:0x00ff */
+#define IDX_IO_6AH		0x6A	/* this WORD can be set to have bits 0x0028 activated; actually inhibits PCM playback!!! maybe power management?? */
+#define IDX_IO_6CH		0x6C
 #define IDX_IO_6EH		0x6E	/* writing 0xffff returns 0x83fe */
 /* further I/O indices not saved/restored, so probably not used */
 
+
 /*** I/O 2 area port indices ***/
 /* (only 0x06 of 0x08 bytes saved/restored by Windows driver) */ 
 #define IDX_IO2_LEGACY_ADDR	0x04
-  #define LEGACY_SOMETHING		0x01 /* OPL3 ?? */
+  #define LEGACY_SOMETHING		0x01 /* OPL3?? */
   #define LEGACY_JOY			0x08
 
+
 /*** mixer I/O area port indices ***/
 /* (only 0x22 of 0x40 bytes saved/restored by Windows driver)
  * generally spoken: AC97 register index = AZF3328 mixer reg index + 2
@@ -148,18 +157,18 @@
   /* unlisted bits are unmodifiable */
   #define MIXER_ADVCTL1_3DWIDTH_MASK	0x000e
   #define MIXER_ADVCTL1_HIFI3D_MASK	0x0300
-#define IDX_MIXER_ADVCTL2       0x20 /* resembles AC97_GENERAL_PURPOSE reg ! */
+#define IDX_MIXER_ADVCTL2       0x20 /* resembles AC97_GENERAL_PURPOSE reg! */
   /* unlisted bits are unmodifiable */
-  #define MIXER_ADVCTL2_BIT7		0x0080 /* WaveOut 3D Bypass ? mutes WaveOut at LineOut */
-  #define MIXER_ADVCTL2_BIT8		0x0100 /* is this Modem Out Select ? */
-  #define MIXER_ADVCTL2_BIT9		0x0200 /* Mono Select Source ? */
-  #define MIXER_ADVCTL2_BIT13		0x2000 /* 3D enable ? */
+  #define MIXER_ADVCTL2_BIT7		0x0080 /* WaveOut 3D Bypass? mutes WaveOut at LineOut */
+  #define MIXER_ADVCTL2_BIT8		0x0100 /* is this Modem Out Select? */
+  #define MIXER_ADVCTL2_BIT9		0x0200 /* Mono Select Source? */
+  #define MIXER_ADVCTL2_BIT13		0x2000 /* 3D enable? */
   #define MIXER_ADVCTL2_BIT15		0x8000 /* unknown */
   
-#define IDX_MIXER_SOMETHING30H	0x30 /* used, but unknown ??? */
+#define IDX_MIXER_SOMETHING30H	0x30 /* used, but unknown??? */
 
 /* driver internal flags */
 #define SET_CHAN_LEFT	1
 #define SET_CHAN_RIGHT	2
 
-#endif /* __SOUND_AZF3328_H  */
+#endif /* __SOUND_AZT3328_H  */