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azt3328.c

/*
 *  azt3328.c - driver for Aztech AZF3328 based soundcards (e.g. PCI168).
 *  Copyright (C) 2002 by Andreas Mohr <hw7oshyuv3001@sneakemail.com>
 *
 *  Framework borrowed from Bart Hartgers's als4000.c.
 *  Driver developed on PCI168 AP(W) version (PCI rev. 10, subsystem ID 1801),
 *  found in a Fujitsu-Siemens PC ("Cordant", aluminum case).
 *  Other versions are:
 *  PCI168 A(W), sub ID 1800
 *  PCI168 A/AP, sub ID 8000
 *  Please give me feedback in case you try my driver with one of these!!
 *
 * GPL LICENSE
 *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 * NOTES
 *  Since Aztech does not provide any chipset documentation,
 *  even on repeated request to various addresses,
 *  and the answer that was finally given was negative
 *  (and I was stupid enough to manage to get hold of a PCI168 soundcard
 *  in the first place >:-P}),
 *  I was forced to base this driver on reverse engineering
 *  (3 weeks' worth of evenings filled with driver work).
 *  (and no, I did NOT go the easy way: to pick up a PCI128 for 9 Euros)
 *
 *  The AZF3328 chip (note: AZF3328, *not* AZT3328, that's just the driver name
 *  for compatibility reasons) has the following features:
 *
 *  - builtin AC97 conformant codec (SNR over 80dB)
 *    (really AC97 compliant?? I really doubt it when looking
 *    at the mixer register layout)
 *  - builtin genuine OPL3
 *  - full duplex 16bit playback/record at independent sampling rate
 *  - 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?)
 *  - I2S serial port for external DAC
 *  - supports 33MHz PCI spec 2.1, PCI power management 1.0, compliant with ACPI
 *  - supports hardware volume control
 *  - single chip low cost solution (128 pin QFP)
 *  - supports programmable Sub-vendor and Sub-system ID
 *    required for Microsoft's logo compliance (FIXME: where?)
 *  - PCI168 AP(W) card: power amplifier with 4 Watts/channel at 4 Ohms
 *
 *  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
 *  
 *  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
 *  people with the same chipset.
 *  Possible remedies:
 *  - plug card into a different PCI slot, preferrably one that isn't shared
 *    too much (this helps a lot, but not completely!)
 *  - get rid of PCI VGA card, use AGP instead
 *  - upgrade or downgrade BIOS
 *  - fiddle with PCI latency settings (setpci -v -s BUSID latency_timer=XX)
 *    Not too helpful.
 *  - 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!!!
 * 
 * TODO
 *  - test MPU401 MIDI playback etc.
 *  - power management (CONFIG_PM). 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.
 *  - figure out what all unknown port bits are responsible for
 */

#include <sound/driver.h>
#include <asm/io.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/gameport.h>
#include <linux/moduleparam.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/pcm.h>
#include <sound/rawmidi.h>
#include <sound/mpu401.h>
#include <sound/opl3.h>
#include <sound/initval.h>
#include "azt3328.h"

MODULE_AUTHOR("Andreas Mohr <hw7oshyuv3001@sneakemail.com>");
MODULE_DESCRIPTION("Aztech AZF3328 (PCI168)");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("{{Aztech,AZF3328}}");

#if defined(CONFIG_GAMEPORT) || (defined(MODULE) && defined(CONFIG_GAMEPORT_MODULE))
#define SUPPORT_JOYSTICK 1
#endif

#define DEBUG_MISC      0
#define DEBUG_CALLS     0
#define DEBUG_MIXER     0
#define DEBUG_PLAY_REC  0
#define DEBUG_IO  0
#define MIXER_TESTING   0

#if DEBUG_MISC
#define snd_azf3328_dbgmisc(format, args...) printk(KERN_ERR format, ##args)
#else
#define snd_azf3328_dbgmisc(format, args...)
#endif            

#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__)
#else
#define snd_azf3328_dbgcalls(format, args...)
#define snd_azf3328_dbgcallenter()
#define snd_azf3328_dbgcallleave()
#endif            

#if DEBUG_MIXER
#define snd_azf3328_dbgmixer(format, args...) printk(format, ##args)
#else
#define snd_azf3328_dbgmixer(format, args...)
#endif            

#if DEBUG_PLAY_REC
#define snd_azf3328_dbgplay(format, args...) printk(KERN_ERR format, ##args)
#else
#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))
#else
#define snd_azf3328_dbgio(chip, where)
#endif
          
static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;    /* Index 0-MAX */
static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;     /* ID for this card */
static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;  /* Enable this card */
#ifdef SUPPORT_JOYSTICK
static int joystick[SNDRV_CARDS];
#endif

module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for AZF3328 soundcard.");
module_param_array(id, charp, NULL, 0444);
MODULE_PARM_DESC(id, "ID string for AZF3328 soundcard.");
module_param_array(enable, bool, NULL, 0444);
MODULE_PARM_DESC(enable, "Enable AZF3328 soundcard.");
#ifdef SUPPORT_JOYSTICK
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;

      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;
      struct resource *res_joystick;
#endif

      struct pci_dev *pci;
      snd_card_t *card;

      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;
};

static 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, }
};

MODULE_DEVICE_TABLE(pci, snd_azf3328_ids);

static inline void snd_azf3328_io2_write(azf3328_t *chip, int reg, unsigned char value)
{
      outb(value, chip->io2_port + reg);
}

static inline unsigned char snd_azf3328_io2_read(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)
{
      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;
      }
}

static void snd_azf3328_mixer_set_mute(azf3328_t *chip, int reg, int do_mute)
{
      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);
      if (do_mute)
            oldval |= 0x80;
      else
            oldval &= ~0x80;
      outb(oldval, chip->mixer_port + reg + 1);
}

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)
{
      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);
      else
            left_done = 1;
      if (chan_sel & SET_CHAN_RIGHT)
            curr_vol_right = inb(chip->mixer_port + reg + 0);
      else
            right_done = 1;
      
      /* take care of muting flag (0x80) contained in left channel */
      if (curr_vol_left & 0x80)
            dst_vol_left |= 0x80;
      else
            dst_vol_left &= ~0x80;

      do
      {
            if (!left_done)
            {
                  if (curr_vol_left > dst_vol_left)
                        curr_vol_left--;
                  else
                  if (curr_vol_left < dst_vol_left)
                        curr_vol_left++;
                  else
                      left_done = 1;
                  outb(curr_vol_left, chip->mixer_port + reg + 1);
            }
            if (!right_done)
            {
                  if (curr_vol_right > dst_vol_right)
                        curr_vol_right--;
                  else
                  if (curr_vol_right < dst_vol_right)
                        curr_vol_right++;
                  else
                      right_done = 1;
                  /* 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);
            }
            if (delay)
                  mdelay(delay);
      }
      while ((!left_done) || (!right_done));
      snd_azf3328_dbgcallleave();
}

/*
 * general mixer element
 */
typedef struct azf3328_mixer_reg {
      unsigned int reg;
      unsigned int lchan_shift, rchan_shift;
      unsigned int mask;
      unsigned int invert: 1;
      unsigned int stereo: 1;
      unsigned int enum_c: 4;
} 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))

static void snd_azf3328_mixer_reg_decode(azf3328_mixer_reg_t *r, unsigned long val)
{
      r->reg = val & 0xff;
      r->lchan_shift = (val >> 8) & 0x0f;
      r->rchan_shift = (val >> 12) & 0x0f;
      r->mask = (val >> 16) & 0xff;
      r->invert = (val >> 24) & 1;
      r->stereo = (val >> 25) & 1;
      r->enum_c = (val >> 26) & 0x0f;
}

/*
 * mixer switches/volumes
 */

#define AZF3328_MIXER_SWITCH(xname, reg, shift, invert) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
  .info = snd_azf3328_info_mixer, \
  .get = snd_azf3328_get_mixer, .put = snd_azf3328_put_mixer, \
  .private_value = COMPOSE_MIXER_REG(reg, shift, 0, 0x1, invert, 0, 0), \
}

#define AZF3328_MIXER_VOL_STEREO(xname, reg, mask, invert) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
  .info = snd_azf3328_info_mixer, \
  .get = snd_azf3328_get_mixer, .put = snd_azf3328_put_mixer, \
  .private_value = COMPOSE_MIXER_REG(reg, 8, 0, mask, invert, 1, 0), \
}

#define AZF3328_MIXER_VOL_MONO(xname, reg, mask, is_right_chan) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
  .info = snd_azf3328_info_mixer, \
  .get = snd_azf3328_get_mixer, .put = snd_azf3328_put_mixer, \
  .private_value = COMPOSE_MIXER_REG(reg, is_right_chan ? 0 : 8, 0, mask, 1, 0, 0), \
}

#define AZF3328_MIXER_VOL_SPECIAL(xname, reg, mask, shift, invert) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
  .info = snd_azf3328_info_mixer, \
  .get = snd_azf3328_get_mixer, .put = snd_azf3328_put_mixer, \
  .private_value = COMPOSE_MIXER_REG(reg, shift, 0, mask, invert, 0, 0), \
}

#define AZF3328_MIXER_ENUM(xname, reg, enum_c, shift) \
{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
  .info = snd_azf3328_info_mixer_enum, \
  .get = snd_azf3328_get_mixer_enum, .put = snd_azf3328_put_mixer_enum, \
  .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)
{
      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->count = reg.stereo + 1;
      uinfo->value.integer.min = 0;
      uinfo->value.integer.max = reg.mask;
      snd_azf3328_dbgcallleave();
      return 0;
}

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;
      unsigned int oreg, val;

      snd_azf3328_dbgcallenter();
      snd_azf3328_mixer_reg_decode(&reg, kcontrol->private_value);

      oreg = inw(chip->mixer_port + reg.reg);
      val = (oreg >> reg.lchan_shift) & reg.mask;
      if (reg.invert)
            val = reg.mask - val;
      ucontrol->value.integer.value[0] = val;
      if (reg.stereo) {
            val = (oreg >> reg.rchan_shift) & reg.mask;
            if (reg.invert)
                  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_dbgcallleave();
      return 0;
}

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;
      unsigned int oreg, nreg, val;

      snd_azf3328_dbgcallenter();
      snd_azf3328_mixer_reg_decode(&reg, kcontrol->private_value);
      oreg = inw(chip->mixer_port + reg.reg);
      val = ucontrol->value.integer.value[0] & reg.mask;
      if (reg.invert)
            val = reg.mask - val;
      nreg = oreg & ~(reg.mask << reg.lchan_shift);
      nreg |= (val << reg.lchan_shift);
      if (reg.stereo) {
            val = ucontrol->value.integer.value[1] & reg.mask;
            if (reg.invert)
                  val = reg.mask - val;
            nreg &= ~(reg.mask << reg.rchan_shift);
            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 */
      else
            outw(nreg, 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, inw(chip->mixer_port + 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)
{
      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"
        };

      snd_azf3328_mixer_reg_decode(&reg, kcontrol->private_value);
        uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
        uinfo->count = (reg.reg == IDX_MIXER_REC_SELECT) ? 2 : 1;
        uinfo->value.enumerated.items = reg.enum_c;
        if (uinfo->value.enumerated.item > reg.enum_c - 1U)
                uinfo->value.enumerated.item = reg.enum_c - 1U;
      if (reg.reg == IDX_MIXER_ADVCTL2)
      {
            if (reg.lchan_shift == 8) /* modem out sel */
                  strcpy(uinfo->value.enumerated.name, texts1[uinfo->value.enumerated.item]);
            else /* mono sel source */
                  strcpy(uinfo->value.enumerated.name, texts2[uinfo->value.enumerated.item]);
      }
      else
            strcpy(uinfo->value.enumerated.name, texts3[uinfo->value.enumerated.item]
);
        return 0;
}

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);
        unsigned short val;
        
      snd_azf3328_mixer_reg_decode(&reg, kcontrol->private_value);
      val = inw(chip->mixer_port + reg.reg);
      if (reg.reg == IDX_MIXER_REC_SELECT)
      {
            ucontrol->value.enumerated.item[0] = (val >> 8) & (reg.enum_c - 1);
            ucontrol->value.enumerated.item[1] = (val >> 0) & (reg.enum_c - 1);
      }
      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);
        return 0;
}

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);
      unsigned int oreg, nreg, val;
        
      snd_azf3328_mixer_reg_decode(&reg, kcontrol->private_value);
      oreg = inw(chip->mixer_port + reg.reg);
      val = oreg;
      if (reg.reg == IDX_MIXER_REC_SELECT)
      {
            if (ucontrol->value.enumerated.item[0] > reg.enum_c - 1U ||
                  ucontrol->value.enumerated.item[1] > reg.enum_c - 1U)
                  return -EINVAL;
            val = (ucontrol->value.enumerated.item[0] << 8) |
                  (ucontrol->value.enumerated.item[1] << 0);
      }
      else
      {
            if (ucontrol->value.enumerated.item[0] > reg.enum_c - 1U)
                  return -EINVAL;
            val &= ~((reg.enum_c - 1) << reg.lchan_shift);
            val |= (ucontrol->value.enumerated.item[0] << reg.lchan_shift);
      }
      outw(val, chip->mixer_port + reg.reg);
      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 = {
      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("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),
      AZF3328_MIXER_VOL_STEREO("CD Playback Volume", IDX_MIXER_CDAUDIO, 0x1f, 1),
      AZF3328_MIXER_SWITCH("Capture Switch", IDX_MIXER_REC_VOLUME, 15, 1),
      AZF3328_MIXER_VOL_STEREO("Capture Volume", IDX_MIXER_REC_VOLUME, 0x0f, 0),
      AZF3328_MIXER_ENUM("Capture Source", IDX_MIXER_REC_SELECT, 8, 0),
      AZF3328_MIXER_SWITCH("Mic Playback Switch", IDX_MIXER_MIC, 15, 1),
      AZF3328_MIXER_VOL_MONO("Mic Playback Volume", IDX_MIXER_MIC, 0x1f, 1),
      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("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),
      AZF3328_MIXER_VOL_STEREO("Aux Playback Volume", IDX_MIXER_AUX, 0x1f, 1),
      AZF3328_MIXER_SWITCH("Modem Playback Switch", IDX_MIXER_MODEMOUT, 15, 1),
      AZF3328_MIXER_VOL_MONO("Modem Playback Volume", IDX_MIXER_MODEMOUT, 0x1f, 1),
      AZF3328_MIXER_SWITCH("Modem Capture Switch", IDX_MIXER_MODEMIN, 15, 1),
      AZF3328_MIXER_VOL_MONO("Modem Capture Volume", IDX_MIXER_MODEMIN, 0x1f, 1),
      AZF3328_MIXER_ENUM("Modem Out Select", IDX_MIXER_ADVCTL2, 2, 8),
      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_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),
      AZF3328_MIXER_SWITCH("1", IDX_MIXER_ADVCTL2, 1, 0),
      AZF3328_MIXER_SWITCH("2", IDX_MIXER_ADVCTL2, 2, 0),
      AZF3328_MIXER_SWITCH("3", IDX_MIXER_ADVCTL2, 3, 0),
      AZF3328_MIXER_SWITCH("4", IDX_MIXER_ADVCTL2, 4, 0),
      AZF3328_MIXER_SWITCH("5", IDX_MIXER_ADVCTL2, 5, 0),
      AZF3328_MIXER_SWITCH("6", IDX_MIXER_ADVCTL2, 6, 0),
      AZF3328_MIXER_SWITCH("7", IDX_MIXER_ADVCTL2, 7, 0),
      AZF3328_MIXER_SWITCH("8", IDX_MIXER_ADVCTL2, 8, 0),
      AZF3328_MIXER_SWITCH("9", IDX_MIXER_ADVCTL2, 9, 0),
      AZF3328_MIXER_SWITCH("10", IDX_MIXER_ADVCTL2, 10, 0),
      AZF3328_MIXER_SWITCH("11", IDX_MIXER_ADVCTL2, 11, 0),
      AZF3328_MIXER_SWITCH("12", IDX_MIXER_ADVCTL2, 12, 0),
      AZF3328_MIXER_SWITCH("13", IDX_MIXER_ADVCTL2, 13, 0),
      AZF3328_MIXER_SWITCH("14", IDX_MIXER_ADVCTL2, 14, 0),
      AZF3328_MIXER_SWITCH("15", IDX_MIXER_ADVCTL2, 15, 0),
#endif
};

#define AZF3328_INIT_VALUES (sizeof(snd_azf3328_init_values)/sizeof(unsigned int)/2)

static unsigned int snd_azf3328_init_values[][2] = {
        { IDX_MIXER_PLAY_MASTER,    MIXER_MUTE_MASK|0x1f1f },
        { IDX_MIXER_MODEMOUT,       MIXER_MUTE_MASK|0x1f1f },
      { IDX_MIXER_BASSTREBLE,       0x0000 },
      { IDX_MIXER_PCBEEP,           MIXER_MUTE_MASK|0x1f1f },
      { IDX_MIXER_MODEMIN,          MIXER_MUTE_MASK|0x1f1f },
      { IDX_MIXER_MIC,        MIXER_MUTE_MASK|0x001f },
      { IDX_MIXER_LINEIN,           MIXER_MUTE_MASK|0x1f1f },
      { IDX_MIXER_CDAUDIO,          MIXER_MUTE_MASK|0x1f1f },
      { IDX_MIXER_VIDEO,            MIXER_MUTE_MASK|0x1f1f },
      { IDX_MIXER_AUX,        MIXER_MUTE_MASK|0x1f1f },
        { IDX_MIXER_WAVEOUT,        MIXER_MUTE_MASK|0x1f1f },
        { IDX_MIXER_FMSYNTH,        MIXER_MUTE_MASK|0x1f1f },
        { IDX_MIXER_REC_VOLUME,           MIXER_MUTE_MASK|0x0707 },
};

static int __devinit snd_azf3328_mixer_new(azf3328_t *chip)
{
      snd_card_t *card;
      snd_kcontrol_new_t *sw;
      unsigned int idx;
      int err;

      snd_azf3328_dbgcallenter();
      snd_assert(chip != NULL && chip->card != NULL, return -EINVAL);

      card = chip->card;

      /* mixer reset */
      snd_azf3328_mixer_write(chip, IDX_MIXER_RESET, 0x0, WORD_VALUE);

      /* 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);
      }
      
      /* add mixer controls */
      sw = snd_azf3328_mixer_controls;
      for (idx = 0; idx < ARRAY_SIZE(snd_azf3328_mixer_controls); idx++, sw++) {
            if ((err = snd_ctl_add(chip->card, snd_ctl_new1(sw, chip))) < 0)
                  return err;
      }
      snd_component_add(card, "AZF3328 mixer");
      strcpy(card->mixername, "AZF3328 mixer");

      snd_azf3328_dbgcallleave();
      return 0;
}

static int snd_azf3328_hw_params(snd_pcm_substream_t * substream,
                         snd_pcm_hw_params_t * hw_params)
{
      int res;
      snd_azf3328_dbgcallenter();
      res = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
      snd_azf3328_dbgcallleave();
      return res;
}

static int snd_azf3328_hw_free(snd_pcm_substream_t * substream)
{
      snd_azf3328_dbgcallenter();
      snd_pcm_lib_free_pages(substream);
      snd_azf3328_dbgcallleave();
      return 0;
}

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;
      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;
      default:
            snd_printk("unknown bitrate %d, assuming 44.1kHz!\n", bitrate);
            val |= 0x05; /* 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 = 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;

      if (format_width == 16)
            val |= SOUNDFORMAT_FLAG_16BIT;

      spin_lock_irqsave(&chip->reg_lock, flags);
      
      /* set bitrate/format */
      outw(val, chip->codec_port+reg);
      
      /* changing the bitrate/format settings switches off the
       * audio output with an annoying click in case of 8/16bit format change
       * (maybe shutting down DAC/ADC?), thus immediately
       * do some tweaking to reenable it and get rid of the clicking
       * (FIXME: yes, it works, but what exactly am I doing here?? :)
       * 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);

      spin_unlock_irqrestore(&chip->reg_lock, flags);
      snd_azf3328_dbgcallleave();
}

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;

      snd_azf3328_dbgcallenter();
      /* AZF3328 uses a two buffer pointer DMA playback approach */
      if (!chip->is_playing)
      {
            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
            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);
            spin_unlock_irqrestore(&chip->reg_lock, flags);
      }
      snd_azf3328_dbgcallleave();
}

static int snd_azf3328_playback_prepare(snd_pcm_substream_t *substream)
{
#if 0
      azf3328_t *chip = snd_pcm_substream_chip(substream);
      snd_pcm_runtime_t *runtime = substream->runtime;
        unsigned int size = snd_pcm_lib_buffer_bytes(substream);
      unsigned int count = snd_pcm_lib_period_bytes(substream);
#endif

      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_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)
{
#if 0
      azf3328_t *chip = snd_pcm_substream_chip(substream);
      snd_pcm_runtime_t *runtime = substream->runtime;
        unsigned int size = snd_pcm_lib_buffer_bytes(substream);
      unsigned int count = snd_pcm_lib_period_bytes(substream);
#endif

      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_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)
{
      azf3328_t *chip = snd_pcm_substream_chip(substream);
      snd_pcm_runtime_t *runtime = substream->runtime;
      int result = 0;
      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");

            /* 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);

            spin_lock(&chip->reg_lock);
            /* stop playback */
            status1 = inw(chip->codec_port+IDX_IO_PLAY_FLAGS);
            status1 &= ~DMA_RESUME;
            outw(status1, chip->codec_port+IDX_IO_PLAY_FLAGS);
          
            /* FIXME: clear interrupts or what??? */
            outw(0xffff, chip->codec_port+IDX_IO_PLAY_IRQMASK);
            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);

            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);

            /* start playback again */
            /* FIXME: what is this value (0x0010)??? */
            status1 |= DMA_RESUME | DMA_EPILOGUE_SOMETHING;
            outw(status1, chip->codec_port+IDX_IO_PLAY_FLAGS);
#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);
#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;
            break;
        case SNDRV_PCM_TRIGGER_STOP:
            /* 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 &= ~DMA_RESUME;
            outw(status1, chip->codec_port+IDX_IO_PLAY_FLAGS);

            status1 |= DMA_PLAY_SOMETHING1;
            outw(status1, chip->codec_port+IDX_IO_PLAY_FLAGS);

            status1 &= ~DMA_PLAY_SOMETHING1;
            outw(status1, chip->codec_port+IDX_IO_PLAY_FLAGS);
            spin_unlock(&chip->reg_lock);
          
            /* now unmute WaveOut */
            snd_azf3328_mixer_set_mute(chip, IDX_MIXER_WAVEOUT, 0);
            chip->is_playing = 0;
            break;
        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
            snd_printk("FIXME: SNDRV_PCM_TRIGGER_PAUSE_PUSH NIY!\n");
                break;
        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
            snd_printk("FIXME: SNDRV_PCM_TRIGGER_PAUSE_RELEASE NIY!\n");
                break;
        default:
                return -EINVAL;
      }
      
      snd_azf3328_dbgcallleave();
      return result;
}

/* 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)
{
      azf3328_t *chip = snd_pcm_substream_chip(substream);
      snd_pcm_runtime_t *runtime = substream->runtime;
      int result = 0;
      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_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 &= ~DMA_RESUME;
            outw(status1, chip->codec_port+IDX_IO_REC_FLAGS);
          
            /* FIXME: clear interrupts or what??? */
            outw(0xffff, chip->codec_port+IDX_IO_REC_IRQMASK);
            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);

            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);

            /* start playback again */
            /* FIXME: what is this value (0x0010)??? */
            status1 |= DMA_RESUME | DMA_EPILOGUE_SOMETHING;
            outw(status1, chip->codec_port+IDX_IO_REC_FLAGS);
#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);
#endif
            spin_unlock(&chip->reg_lock);

            snd_azf3328_dbgio(chip, "trigger2");
            chip->is_playing = 1;
            break;
        case SNDRV_PCM_TRIGGER_STOP:
            spin_lock(&chip->reg_lock);
            /* stop recording */
            status1 = inw(chip->codec_port+IDX_IO_REC_FLAGS);

            status1 &= ~DMA_RESUME;
            outw(status1, chip->codec_port+IDX_IO_REC_FLAGS);

            status1 |= DMA_PLAY_SOMETHING1;
            outw(status1, chip->codec_port+IDX_IO_REC_FLAGS);

            status1 &= ~DMA_PLAY_SOMETHING1;
            outw(status1, chip->codec_port+IDX_IO_REC_FLAGS);
            spin_unlock(&chip->reg_lock);
          
            chip->is_playing = 0;
            break;
        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
            snd_printk("FIXME: SNDRV_PCM_TRIGGER_PAUSE_PUSH NIY!\n");
                break;
        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
            snd_printk("FIXME: SNDRV_PCM_TRIGGER_PAUSE_RELEASE NIY!\n");
                break;
        default:
                return -EINVAL;
      }
      
      snd_azf3328_dbgcallleave();
      return result;
}

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;
      snd_pcm_uframes_t frmres;

#ifdef QUERY_HARDWARE
      bufptr = inl(chip->codec_port+IDX_IO_PLAY_DMA_START_1);
#else
      bufptr = substream->runtime->dma_addr;
#endif
      playptr = 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);
      return frmres;
}

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;
      snd_pcm_uframes_t frmres;

#ifdef QUERY_HARDWARE
      bufptr = inl(chip->codec_port+IDX_IO_REC_DMA_START_1);
#else
      bufptr = substream->runtime->dma_addr;
#endif
      recptr = 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);
      return frmres;
}

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;

      status  = inw(chip->codec_port+IDX_IO_IRQSTATUS);

        /* fast path out, to ease interrupt sharing */
      if (!(status & (IRQ_PLAYBACK|IRQ_RECORDING|IRQ_MPU401|IRQ_SOMEIRQ)))
            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));
            
      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");
            }
            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));
            }
            else
                  snd_azf3328_dbgplay("azt3328: ouch, irq handler problem!\n");
                  spin_unlock(&chip->reg_lock);
      }
      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");
            }
            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));
            }
                  spin_unlock(&chip->reg_lock);
      }
      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++;
      return IRQ_HANDLED;
}

/*****************************************************************/

static 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,
      .channels_min =         1,
      .channels_max =         2,
      .buffer_bytes_max =     65536,
      .period_bytes_min =     64,
      .period_bytes_max =     65536,
      .periods_min =          1,
      .periods_max =          1024,
      /* FIXME: maybe that card actually has a FIFO?
       * Hmm, it seems newer revisions do have one, but we still don't know
       * its size... */
      .fifo_size =            0,
};

static 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,
      .channels_min =         1,
      .channels_max =         2,
      .buffer_bytes_max =     65536,
      .period_bytes_min =     64,
      .period_bytes_max =     65536,
      .periods_min =          1,
      .periods_max =          1024,
      .fifo_size =            0,
};


static unsigned int snd_azf3328_fixed_rates[] = {
      5512, 6620, 8000, 9600, 11025, 16000, 22050, 32000, 44100, 48000, 64000
};
static snd_pcm_hw_constraint_list_t snd_azf3328_hw_constraints_rates = {
      .count = ARRAY_SIZE(snd_azf3328_fixed_rates), 
      .list = snd_azf3328_fixed_rates,
      .mask = 0,
};

/*****************************************************************/

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;

      snd_azf3328_dbgcallenter();
      chip->playback_substream = substream;
      runtime->hw = snd_azf3328_playback;
      snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
                           &snd_azf3328_hw_constraints_rates);
      snd_azf3328_dbgcallleave();
      return 0;
}

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;

      snd_azf3328_dbgcallenter();
      chip->capture_substream = substream;
      runtime->hw = snd_azf3328_capture;
      snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
                           &snd_azf3328_hw_constraints_rates);
      snd_azf3328_dbgcallleave();
      return 0;
}

static int snd_azf3328_playback_close(snd_pcm_substream_t * substream)
{
      azf3328_t *chip = snd_pcm_substream_chip(substream);

      snd_azf3328_dbgcallenter();

      chip->playback_substream = NULL;
      snd_azf3328_dbgcallleave();
      return 0;
}

static int snd_azf3328_capture_close(snd_pcm_substream_t * substream)
{
      azf3328_t *chip = snd_pcm_substream_chip(substream);

      snd_azf3328_dbgcallenter();
      chip->capture_substream = NULL;
      snd_azf3328_dbgcallleave();
      return 0;
}

/******************************************************************/

static snd_pcm_ops_t snd_azf3328_playback_ops = {
      .open =           snd_azf3328_playback_open,
      .close =    snd_azf3328_playback_close,
      .ioctl =    snd_pcm_lib_ioctl,
      .hw_params =      snd_azf3328_hw_params,
      .hw_free =  snd_azf3328_hw_free,
      .prepare =  snd_azf3328_playback_prepare,
      .trigger =  snd_azf3328_playback_trigger,
      .pointer =  snd_azf3328_playback_pointer
};

static snd_pcm_ops_t snd_azf3328_capture_ops = {
      .open =           snd_azf3328_capture_open,
      .close =    snd_azf3328_capture_close,
      .ioctl =    snd_pcm_lib_ioctl,
      .hw_params =      snd_azf3328_hw_params,
      .hw_free =  snd_azf3328_hw_free,
      .prepare =  snd_azf3328_capture_prepare,
      .trigger =  snd_azf3328_capture_trigger,
      .pointer =  snd_azf3328_capture_pointer
};

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)
{
      snd_pcm_t *pcm;
      int err;

      snd_azf3328_dbgcallenter();
      if ((err = snd_pcm_new(chip->card, "AZF3328 DSP", device, 1, 1, &pcm)) < 0)
            return err;
      snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_azf3328_playback_ops);
      snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_azf3328_capture_ops);

      pcm->private_data = chip;
      pcm->private_free = snd_azf3328_pcm_free;
      pcm->info_flags = 0;
      strcpy(pcm->name, chip->card->shortname);
      chip->pcm = pcm;

      snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
                                    snd_dma_pci_data(chip->pci), 64*1024, 64*1024);

      snd_azf3328_dbgcallleave();
      return 0;
}

/******************************************************************/

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);

        /* interrupt setup - mask everything */
      /* FIXME */

        synchronize_irq(chip->irq);
      __end_hw:
#ifdef SUPPORT_JOYSTICK
      if (chip->res_joystick) {
            gameport_unregister_port(&chip->gameport);
            /* disable gameport */
            snd_azf3328_io2_write(chip, IDX_IO2_LEGACY_ADDR,
                              snd_azf3328_io2_read(chip, IDX_IO2_LEGACY_ADDR) & ~LEGACY_JOY);
            release_resource(chip->res_joystick);
            kfree_nocheck(chip->res_joystick);
      }
#endif
        if (chip->irq >= 0)
            free_irq(chip->irq, (void *)chip);
      pci_release_regions(chip->pci);
      pci_disable_device(chip->pci);

        kfree(chip);
        return 0;
}

static int snd_azf3328_dev_free(snd_device_t *device)
{
      azf3328_t *chip = device->device_data;
      return snd_azf3328_free(chip);
}

#if 0
/* check whether a bit can be modified */
static void snd_azf3328_test_bit(unsigned int reg, int bit)
{
      unsigned char val, valoff, valon;

      val = inb(reg);

      outb(val & ~(1 << bit), reg);
      valoff = inb(reg);

      outb(val|(1 << bit), reg);
      valon = inb(reg);
      
      outb(val, reg);

      printk(KERN_ERR "reg %04x bit %d: %02x %02x %02x\n", reg, bit, val, valoff, valon);
}
#endif

static int __devinit snd_azf3328_create(snd_card_t * card,
                                         struct pci_dev *pci,
                                         unsigned long device_type,
                                         azf3328_t ** rchip)
{
      azf3328_t *chip;
      int err;
      static snd_device_ops_t ops = {
            .dev_free =     snd_azf3328_dev_free,
      };
      u16 tmp;

      *rchip = NULL;

      if ((err = pci_enable_device(pci)) < 0)
            return err;

      chip = kcalloc(1, sizeof(*chip), GFP_KERNEL);
      if (chip == NULL) {
            pci_disable_device(pci);
            return -ENOMEM;
      }
      spin_lock_init(&chip->reg_lock);
      chip->card = card;
      chip->pci = pci;
      chip->irq = -1;

      /* check if we can restrict PCI DMA transfers to 24 bits */
      if (pci_set_dma_mask(pci, 0x00ffffff) < 0 ||
          pci_set_consistent_dma_mask(pci, 0x00ffffff) < 0) {
            snd_printk("architecture does not support 24bit PCI busmaster DMA\n");
            pci_disable_device(pci);
            return -ENXIO;
      }

      if ((err = pci_request_regions(pci, "Aztech AZF3328")) < 0) {
            kfree(chip);
            pci_disable_device(pci);
            return 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->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("unable to grab IRQ %d\n", pci->irq);
            snd_azf3328_free(chip);
            return -EBUSY;
      }
      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));

      if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
            snd_azf3328_free(chip);
            return err;
      }

      /* create mixer interface & switches */
      if ((err = snd_azf3328_mixer_new(chip)) < 0)
            return err;

#if 0
      /* set very low bitrate to reduce noise and power consumption? */
      snd_azf3328_setfmt(chip, IDX_IO_PLAY_SOUNDFORMAT, 5512, 8, 1);
#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);

      spin_unlock_irq(&chip->reg_lock);

      snd_card_set_dev(card, &pci->dev);

      *rchip = chip;
      return 0;
}

#ifdef SUPPORT_JOYSTICK
static void __devinit snd_azf3328_config_joystick(azf3328_t *chip, int joystick)
{
      unsigned char val;

      if (joystick == 1) {
            if ((chip->res_joystick = request_region(0x200, 8, "AZF3328 gameport")) != NULL)
                  chip->gameport.io = 0x200;
      }

      val = inb(chip->io2_port + IDX_IO2_LEGACY_ADDR);
      if (chip->res_joystick)
            val |= LEGACY_JOY;
      else
            val &= ~LEGACY_JOY;

      outb(val, chip->io2_port + IDX_IO2_LEGACY_ADDR);
      if (chip->res_joystick)
            gameport_register_port(&chip->gameport);
}
#endif

static int __devinit snd_azf3328_probe(struct pci_dev *pci,
                                const struct pci_device_id *pci_id)
{
      static int dev;
      snd_card_t *card;
      azf3328_t *chip;
      opl3_t *opl3;
      int err;

      snd_azf3328_dbgcallenter();
      if (dev >= SNDRV_CARDS)
            return -ENODEV;
      if (!enable[dev]) {
            dev++;
            return -ENOENT;
      }

      card = snd_card_new(index[dev], id[dev], THIS_MODULE, 0 );
      if (card == NULL)
            return -ENOMEM;

      strcpy(card->driver, "AZF3328");
      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;
      }

      if ((err = snd_mpu401_uart_new( card, 0, MPU401_HW_MPU401,
                                chip->mpu_port, 1, pci->irq, 0,
                                &chip->rmidi)) < 0) {
            snd_printk("azf3328: no MPU-401 device at 0x%lx?\n", chip->mpu_port);
            snd_card_free(card);
            return err;
      }

      if ((err = snd_azf3328_pcm(chip, 0)) < 0) {
            snd_card_free(card);
            return err;
      }

      if (snd_opl3_create(card, chip->synth_port, chip->synth_port+2,
                      OPL3_HW_AUTO, 1, &opl3) < 0) {
            snd_printk("azf3328: no OPL3 device at 0x%lx-0x%lx?\n",
                     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;
            }
      }

      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;
      }

#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");
#endif

#ifdef SUPPORT_JOYSTICK
      snd_azf3328_config_joystick(chip, joystick[dev]);
#endif

      pci_set_drvdata(pci, card);
      dev++;

      snd_azf3328_dbgcallleave();
      return 0;
}

static void __devexit snd_azf3328_remove(struct pci_dev *pci)
{
      snd_azf3328_dbgcallenter();
      snd_card_free(pci_get_drvdata(pci));
      pci_set_drvdata(pci, NULL);
      snd_azf3328_dbgcallleave();
}

static struct pci_driver driver = {
      .name = "AZF3328",
      .id_table = snd_azf3328_ids,
      .probe = snd_azf3328_probe,
      .remove = __devexit_p(snd_azf3328_remove),
};

static int __init alsa_card_azf3328_init(void)
{
      int err;
      snd_azf3328_dbgcallenter();
      err = pci_module_init(&driver);
      snd_azf3328_dbgcallleave();
      return err;
}

static void __exit alsa_card_azf3328_exit(void)
{
      snd_azf3328_dbgcallenter();
      pci_unregister_driver(&driver);
      snd_azf3328_dbgcallleave();
}

module_init(alsa_card_azf3328_init)
module_exit(alsa_card_azf3328_exit)

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