/*
   *  Driver for ESS Solo-1 (ES1938, ES1946, ES1969) soundcard
   *  Copyright (c) by Jaromir Koutek <miri@punknet.cz>,

   *                   Jaroslav Kysela <perex@perex.cz>,

   *                   Thomas Sailer <sailer@ife.ee.ethz.ch>,
   *                   Abramo Bagnara <abramo@alsa-project.org>,
   *                   Markus Gruber <gruber@eikon.tum.de>
   * 
   * Rewritten from sonicvibes.c source.
   *
   *  TODO:
   *    Rewrite better spinlocks
   *
   *
   *   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:
    - Capture data is written unaligned starting from dma_base + 1 so I need to
      disable mmap and to add a copy callback.
    - After several cycle of the following:
      while : ; do arecord -d1 -f cd -t raw | aplay -f cd ; done
      a "playback write error (DMA or IRQ trouble?)" may happen.
      This is due to playback interrupts not generated.
      I suspect a timing issue.
    - Sometimes the interrupt handler is invoked wrongly during playback.
      This generates some harmless "Unexpected hw_pointer: wrong interrupt
      acknowledge".
      I've seen that using small period sizes.
      Reproducible with:
      mpg123 test.mp3 &
      hdparm -t -T /dev/hda
  */

  #include <linux/init.h>
  #include <linux/interrupt.h>
  #include <linux/pci.h>
  #include <linux/slab.h>
  #include <linux/gameport.h>

  #include <linux/module.h>

  #include <linux/delay.h>

  #include <linux/dma-mapping.h>

  #include <sound/core.h>
  #include <sound/control.h>
  #include <sound/pcm.h>
  #include <sound/opl3.h>
  #include <sound/mpu401.h>
  #include <sound/initval.h>

  #include <sound/tlv.h>

  
  #include <asm/io.h>
  
  MODULE_AUTHOR("Jaromir Koutek <miri@punknet.cz>");
  MODULE_DESCRIPTION("ESS Solo-1");
  MODULE_LICENSE("GPL");
  MODULE_SUPPORTED_DEVICE("{{ESS,ES1938},"
                  "{ESS,ES1946},"
                  "{ESS,ES1969},"
  		"{TerraTec,128i PCI}}");
  
  #if defined(CONFIG_GAMEPORT) || (defined(MODULE) && defined(CONFIG_GAMEPORT_MODULE))
  #define SUPPORT_JOYSTICK 1
  #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 bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;	/* Enable this card */

  
  module_param_array(index, int, NULL, 0444);
  MODULE_PARM_DESC(index, "Index value for ESS Solo-1 soundcard.");
  module_param_array(id, charp, NULL, 0444);
  MODULE_PARM_DESC(id, "ID string for ESS Solo-1 soundcard.");
  module_param_array(enable, bool, NULL, 0444);
  MODULE_PARM_DESC(enable, "Enable ESS Solo-1 soundcard.");
  
  #define SLIO_REG(chip, x) ((chip)->io_port + ESSIO_REG_##x)
  
  #define SLDM_REG(chip, x) ((chip)->ddma_port + ESSDM_REG_##x)
  
  #define SLSB_REG(chip, x) ((chip)->sb_port + ESSSB_REG_##x)
  
  #define SL_PCI_LEGACYCONTROL		0x40
  #define SL_PCI_CONFIG			0x50
  #define SL_PCI_DDMACONTROL		0x60
  
  #define ESSIO_REG_AUDIO2DMAADDR		0
  #define ESSIO_REG_AUDIO2DMACOUNT	4
  #define ESSIO_REG_AUDIO2MODE		6
  #define ESSIO_REG_IRQCONTROL		7
  
  #define ESSDM_REG_DMAADDR		0x00
  #define ESSDM_REG_DMACOUNT		0x04
  #define ESSDM_REG_DMACOMMAND		0x08
  #define ESSDM_REG_DMASTATUS		0x08
  #define ESSDM_REG_DMAMODE		0x0b
  #define ESSDM_REG_DMACLEAR		0x0d
  #define ESSDM_REG_DMAMASK		0x0f
  
  #define ESSSB_REG_FMLOWADDR		0x00
  #define ESSSB_REG_FMHIGHADDR		0x02
  #define ESSSB_REG_MIXERADDR		0x04
  #define ESSSB_REG_MIXERDATA		0x05
  
  #define ESSSB_IREG_AUDIO1		0x14
  #define ESSSB_IREG_MICMIX		0x1a
  #define ESSSB_IREG_RECSRC		0x1c
  #define ESSSB_IREG_MASTER		0x32
  #define ESSSB_IREG_FM			0x36
  #define ESSSB_IREG_AUXACD		0x38
  #define ESSSB_IREG_AUXB			0x3a
  #define ESSSB_IREG_PCSPEAKER		0x3c
  #define ESSSB_IREG_LINE			0x3e
  #define ESSSB_IREG_SPATCONTROL		0x50
  #define ESSSB_IREG_SPATLEVEL		0x52
  #define ESSSB_IREG_MASTER_LEFT		0x60
  #define ESSSB_IREG_MASTER_RIGHT		0x62
  #define ESSSB_IREG_MPU401CONTROL	0x64
  #define ESSSB_IREG_MICMIXRECORD		0x68
  #define ESSSB_IREG_AUDIO2RECORD		0x69
  #define ESSSB_IREG_AUXACDRECORD		0x6a
  #define ESSSB_IREG_FMRECORD		0x6b
  #define ESSSB_IREG_AUXBRECORD		0x6c
  #define ESSSB_IREG_MONO			0x6d
  #define ESSSB_IREG_LINERECORD		0x6e
  #define ESSSB_IREG_MONORECORD		0x6f
  #define ESSSB_IREG_AUDIO2SAMPLE		0x70
  #define ESSSB_IREG_AUDIO2MODE		0x71
  #define ESSSB_IREG_AUDIO2FILTER		0x72
  #define ESSSB_IREG_AUDIO2TCOUNTL	0x74
  #define ESSSB_IREG_AUDIO2TCOUNTH	0x76
  #define ESSSB_IREG_AUDIO2CONTROL1	0x78
  #define ESSSB_IREG_AUDIO2CONTROL2	0x7a
  #define ESSSB_IREG_AUDIO2		0x7c
  
  #define ESSSB_REG_RESET			0x06
  
  #define ESSSB_REG_READDATA		0x0a
  #define ESSSB_REG_WRITEDATA		0x0c
  #define ESSSB_REG_READSTATUS		0x0c
  
  #define ESSSB_REG_STATUS		0x0e
  
  #define ESS_CMD_EXTSAMPLERATE		0xa1
  #define ESS_CMD_FILTERDIV		0xa2
  #define ESS_CMD_DMACNTRELOADL		0xa4
  #define ESS_CMD_DMACNTRELOADH		0xa5
  #define ESS_CMD_ANALOGCONTROL		0xa8
  #define ESS_CMD_IRQCONTROL		0xb1
  #define ESS_CMD_DRQCONTROL		0xb2
  #define ESS_CMD_RECLEVEL		0xb4
  #define ESS_CMD_SETFORMAT		0xb6
  #define ESS_CMD_SETFORMAT2		0xb7
  #define ESS_CMD_DMACONTROL		0xb8
  #define ESS_CMD_DMATYPE			0xb9
  #define ESS_CMD_OFFSETLEFT		0xba	
  #define ESS_CMD_OFFSETRIGHT		0xbb
  #define ESS_CMD_READREG			0xc0
  #define ESS_CMD_ENABLEEXT		0xc6
  #define ESS_CMD_PAUSEDMA		0xd0
  #define ESS_CMD_ENABLEAUDIO1		0xd1
  #define ESS_CMD_STOPAUDIO1		0xd3
  #define ESS_CMD_AUDIO1STATUS		0xd8
  #define ESS_CMD_CONTDMA			0xd4
  #define ESS_CMD_TESTIRQ			0xf2
  
  #define ESS_RECSRC_MIC		0
  #define ESS_RECSRC_AUXACD	2
  #define ESS_RECSRC_AUXB		5
  #define ESS_RECSRC_LINE		6
  #define ESS_RECSRC_NONE		7
  
  #define DAC1 0x01
  #define ADC1 0x02
  #define DAC2 0x04
  
  /*
  
   */

  #define SAVED_REG_SIZE	32 /* max. number of registers to save */

  struct es1938 {

  	int irq;
  
  	unsigned long io_port;
  	unsigned long sb_port;
  	unsigned long vc_port;
  	unsigned long mpu_port;
  	unsigned long game_port;
  	unsigned long ddma_port;
  
  	unsigned char irqmask;
  	unsigned char revision;

  	struct snd_kcontrol *hw_volume;
  	struct snd_kcontrol *hw_switch;
  	struct snd_kcontrol *master_volume;
  	struct snd_kcontrol *master_switch;

  
  	struct pci_dev *pci;

  	struct snd_card *card;
  	struct snd_pcm *pcm;
  	struct snd_pcm_substream *capture_substream;
  	struct snd_pcm_substream *playback1_substream;
  	struct snd_pcm_substream *playback2_substream;
  	struct snd_rawmidi *rmidi;

  
  	unsigned int dma1_size;
  	unsigned int dma2_size;
  	unsigned int dma1_start;
  	unsigned int dma2_start;
  	unsigned int dma1_shift;
  	unsigned int dma2_shift;

  	unsigned int last_capture_dmaaddr;

  	unsigned int active;
  
  	spinlock_t reg_lock;
  	spinlock_t mixer_lock;

          struct snd_info_entry *proc_entry;

  
  #ifdef SUPPORT_JOYSTICK
  	struct gameport *gameport;
  #endif
  #ifdef CONFIG_PM
  	unsigned char saved_regs[SAVED_REG_SIZE];
  #endif
  };

  static irqreturn_t snd_es1938_interrupt(int irq, void *dev_id);

  static DEFINE_PCI_DEVICE_TABLE(snd_es1938_ids) = {

  	{ PCI_VDEVICE(ESS, 0x1969), 0, },   /* Solo-1 */

  	{ 0, }
  };
  
  MODULE_DEVICE_TABLE(pci, snd_es1938_ids);
  
  #define RESET_LOOP_TIMEOUT	0x10000
  #define WRITE_LOOP_TIMEOUT	0x10000
  #define GET_LOOP_TIMEOUT	0x01000
  
  #undef REG_DEBUG
  /* -----------------------------------------------------------------
   * Write to a mixer register
   * -----------------------------------------------------------------*/

  static void snd_es1938_mixer_write(struct es1938 *chip, unsigned char reg, unsigned char val)

  {
  	unsigned long flags;
  	spin_lock_irqsave(&chip->mixer_lock, flags);
  	outb(reg, SLSB_REG(chip, MIXERADDR));
  	outb(val, SLSB_REG(chip, MIXERDATA));
  	spin_unlock_irqrestore(&chip->mixer_lock, flags);
  #ifdef REG_DEBUG

  	snd_printk(KERN_DEBUG "Mixer reg %02x set to %02x
  ", reg, val);

  #endif
  }
  
  /* -----------------------------------------------------------------
   * Read from a mixer register
   * -----------------------------------------------------------------*/

  static int snd_es1938_mixer_read(struct es1938 *chip, unsigned char reg)

  {
  	int data;
  	unsigned long flags;
  	spin_lock_irqsave(&chip->mixer_lock, flags);
  	outb(reg, SLSB_REG(chip, MIXERADDR));
  	data = inb(SLSB_REG(chip, MIXERDATA));
  	spin_unlock_irqrestore(&chip->mixer_lock, flags);
  #ifdef REG_DEBUG

  	snd_printk(KERN_DEBUG "Mixer reg %02x now is %02x
  ", reg, data);

  #endif
  	return data;
  }
  
  /* -----------------------------------------------------------------
   * Write to some bits of a mixer register (return old value)
   * -----------------------------------------------------------------*/

  static int snd_es1938_mixer_bits(struct es1938 *chip, unsigned char reg,
  				 unsigned char mask, unsigned char val)

  {
  	unsigned long flags;
  	unsigned char old, new, oval;
  	spin_lock_irqsave(&chip->mixer_lock, flags);
  	outb(reg, SLSB_REG(chip, MIXERADDR));
  	old = inb(SLSB_REG(chip, MIXERDATA));
  	oval = old & mask;
  	if (val != oval) {
  		new = (old & ~mask) | (val & mask);
  		outb(new, SLSB_REG(chip, MIXERDATA));
  #ifdef REG_DEBUG

  		snd_printk(KERN_DEBUG "Mixer reg %02x was %02x, set to %02x
  ",
  			   reg, old, new);

  #endif
  	}
  	spin_unlock_irqrestore(&chip->mixer_lock, flags);
  	return oval;
  }
  
  /* -----------------------------------------------------------------
   * Write command to Controller Registers
   * -----------------------------------------------------------------*/

  static void snd_es1938_write_cmd(struct es1938 *chip, unsigned char cmd)

  {
  	int i;
  	unsigned char v;
  	for (i = 0; i < WRITE_LOOP_TIMEOUT; i++) {
  		if (!(v = inb(SLSB_REG(chip, READSTATUS)) & 0x80)) {
  			outb(cmd, SLSB_REG(chip, WRITEDATA));
  			return;
  		}
  	}

  	printk(KERN_ERR "snd_es1938_write_cmd timeout (0x02%x/0x02%x)
  ", cmd, v);

  }
  
  /* -----------------------------------------------------------------
   * Read the Read Data Buffer
   * -----------------------------------------------------------------*/

  static int snd_es1938_get_byte(struct es1938 *chip)

  {
  	int i;
  	unsigned char v;
  	for (i = GET_LOOP_TIMEOUT; i; i--)
  		if ((v = inb(SLSB_REG(chip, STATUS))) & 0x80)
  			return inb(SLSB_REG(chip, READDATA));

  	snd_printk(KERN_ERR "get_byte timeout: status 0x02%x
  ", v);

  	return -ENODEV;
  }
  
  /* -----------------------------------------------------------------
   * Write value cmd register
   * -----------------------------------------------------------------*/

  static void snd_es1938_write(struct es1938 *chip, unsigned char reg, unsigned char val)

  {
  	unsigned long flags;
  	spin_lock_irqsave(&chip->reg_lock, flags);
  	snd_es1938_write_cmd(chip, reg);
  	snd_es1938_write_cmd(chip, val);
  	spin_unlock_irqrestore(&chip->reg_lock, flags);
  #ifdef REG_DEBUG

  	snd_printk(KERN_DEBUG "Reg %02x set to %02x
  ", reg, val);

  #endif
  }
  
  /* -----------------------------------------------------------------
   * Read data from cmd register and return it
   * -----------------------------------------------------------------*/

  static unsigned char snd_es1938_read(struct es1938 *chip, unsigned char reg)

  {
  	unsigned char val;
  	unsigned long flags;
  	spin_lock_irqsave(&chip->reg_lock, flags);
  	snd_es1938_write_cmd(chip, ESS_CMD_READREG);
  	snd_es1938_write_cmd(chip, reg);
  	val = snd_es1938_get_byte(chip);
  	spin_unlock_irqrestore(&chip->reg_lock, flags);
  #ifdef REG_DEBUG

  	snd_printk(KERN_DEBUG "Reg %02x now is %02x
  ", reg, val);

  #endif
  	return val;
  }
  
  /* -----------------------------------------------------------------
   * Write data to cmd register and return old value
   * -----------------------------------------------------------------*/

  static int snd_es1938_bits(struct es1938 *chip, unsigned char reg, unsigned char mask,
  			   unsigned char val)

  {
  	unsigned long flags;
  	unsigned char old, new, oval;
  	spin_lock_irqsave(&chip->reg_lock, flags);
  	snd_es1938_write_cmd(chip, ESS_CMD_READREG);
  	snd_es1938_write_cmd(chip, reg);
  	old = snd_es1938_get_byte(chip);
  	oval = old & mask;
  	if (val != oval) {
  		snd_es1938_write_cmd(chip, reg);
  		new = (old & ~mask) | (val & mask);
  		snd_es1938_write_cmd(chip, new);
  #ifdef REG_DEBUG

  		snd_printk(KERN_DEBUG "Reg %02x was %02x, set to %02x
  ",
  			   reg, old, new);

  #endif
  	}
  	spin_unlock_irqrestore(&chip->reg_lock, flags);
  	return oval;
  }
  
  /* --------------------------------------------------------------------
   * Reset the chip
   * --------------------------------------------------------------------*/

  static void snd_es1938_reset(struct es1938 *chip)

  {
  	int i;
  
  	outb(3, SLSB_REG(chip, RESET));
  	inb(SLSB_REG(chip, RESET));
  	outb(0, SLSB_REG(chip, RESET));
  	for (i = 0; i < RESET_LOOP_TIMEOUT; i++) {
  		if (inb(SLSB_REG(chip, STATUS)) & 0x80) {
  			if (inb(SLSB_REG(chip, READDATA)) == 0xaa)
  				goto __next;
  		}
  	}

  	snd_printk(KERN_ERR "ESS Solo-1 reset failed
  ");

  
       __next:
  	snd_es1938_write_cmd(chip, ESS_CMD_ENABLEEXT);
  
  	/* Demand transfer DMA: 4 bytes per DMA request */
  	snd_es1938_write(chip, ESS_CMD_DMATYPE, 2);
  
  	/* Change behaviour of register A1
  	   4x oversampling
  	   2nd channel DAC asynchronous */                                                      
  	snd_es1938_mixer_write(chip, ESSSB_IREG_AUDIO2MODE, 0x32);
  	/* enable/select DMA channel and IRQ channel */
  	snd_es1938_bits(chip, ESS_CMD_IRQCONTROL, 0xf0, 0x50);
  	snd_es1938_bits(chip, ESS_CMD_DRQCONTROL, 0xf0, 0x50);
  	snd_es1938_write_cmd(chip, ESS_CMD_ENABLEAUDIO1);
  	/* Set spatializer parameters to recommended values */
  	snd_es1938_mixer_write(chip, 0x54, 0x8f);
  	snd_es1938_mixer_write(chip, 0x56, 0x95);
  	snd_es1938_mixer_write(chip, 0x58, 0x94);
  	snd_es1938_mixer_write(chip, 0x5a, 0x80);
  }
  
  /* --------------------------------------------------------------------
   * Reset the FIFOs
   * --------------------------------------------------------------------*/

  static void snd_es1938_reset_fifo(struct es1938 *chip)

  {
  	outb(2, SLSB_REG(chip, RESET));
  	outb(0, SLSB_REG(chip, RESET));
  }

  static struct snd_ratnum clocks[2] = {

  	{
  		.num = 793800,
  		.den_min = 1,
  		.den_max = 128,
  		.den_step = 1,
  	},
  	{
  		.num = 768000,
  		.den_min = 1,
  		.den_max = 128,
  		.den_step = 1,
  	}
  };

  static struct snd_pcm_hw_constraint_ratnums hw_constraints_clocks = {

  	.nrats = 2,
  	.rats = clocks,
  };

  static void snd_es1938_rate_set(struct es1938 *chip, 
  				struct snd_pcm_substream *substream,

  				int mode)
  {
  	unsigned int bits, div0;

  	struct snd_pcm_runtime *runtime = substream->runtime;

  	if (runtime->rate_num == clocks[0].num)
  		bits = 128 - runtime->rate_den;
  	else
  		bits = 256 - runtime->rate_den;
  
  	/* set filter register */
  	div0 = 256 - 7160000*20/(8*82*runtime->rate);
  		
  	if (mode == DAC2) {
  		snd_es1938_mixer_write(chip, 0x70, bits);
  		snd_es1938_mixer_write(chip, 0x72, div0);
  	} else {
  		snd_es1938_write(chip, 0xA1, bits);
  		snd_es1938_write(chip, 0xA2, div0);
  	}
  }
  
  /* --------------------------------------------------------------------
   * Configure Solo1 builtin DMA Controller
   * --------------------------------------------------------------------*/

  static void snd_es1938_playback1_setdma(struct es1938 *chip)

  {
  	outb(0x00, SLIO_REG(chip, AUDIO2MODE));
  	outl(chip->dma2_start, SLIO_REG(chip, AUDIO2DMAADDR));
  	outw(0, SLIO_REG(chip, AUDIO2DMACOUNT));
  	outw(chip->dma2_size, SLIO_REG(chip, AUDIO2DMACOUNT));
  }

  static void snd_es1938_playback2_setdma(struct es1938 *chip)

  {
  	/* Enable DMA controller */
  	outb(0xc4, SLDM_REG(chip, DMACOMMAND));
  	/* 1. Master reset */
  	outb(0, SLDM_REG(chip, DMACLEAR));
  	/* 2. Mask DMA */
  	outb(1, SLDM_REG(chip, DMAMASK));
  	outb(0x18, SLDM_REG(chip, DMAMODE));
  	outl(chip->dma1_start, SLDM_REG(chip, DMAADDR));
  	outw(chip->dma1_size - 1, SLDM_REG(chip, DMACOUNT));
  	/* 3. Unmask DMA */
  	outb(0, SLDM_REG(chip, DMAMASK));
  }

  static void snd_es1938_capture_setdma(struct es1938 *chip)

  {
  	/* Enable DMA controller */
  	outb(0xc4, SLDM_REG(chip, DMACOMMAND));
  	/* 1. Master reset */
  	outb(0, SLDM_REG(chip, DMACLEAR));
  	/* 2. Mask DMA */
  	outb(1, SLDM_REG(chip, DMAMASK));
  	outb(0x14, SLDM_REG(chip, DMAMODE));
  	outl(chip->dma1_start, SLDM_REG(chip, DMAADDR));

  	chip->last_capture_dmaaddr = chip->dma1_start;

  	outw(chip->dma1_size - 1, SLDM_REG(chip, DMACOUNT));
  	/* 3. Unmask DMA */
  	outb(0, SLDM_REG(chip, DMAMASK));
  }
  
  /* ----------------------------------------------------------------------
   *
   *                           *** PCM part ***
   */

  static int snd_es1938_capture_trigger(struct snd_pcm_substream *substream,

  				      int cmd)
  {

  	struct es1938 *chip = snd_pcm_substream_chip(substream);

  	int val;
  	switch (cmd) {
  	case SNDRV_PCM_TRIGGER_START:

  	case SNDRV_PCM_TRIGGER_RESUME:

  		val = 0x0f;
  		chip->active |= ADC1;
  		break;
  	case SNDRV_PCM_TRIGGER_STOP:

  	case SNDRV_PCM_TRIGGER_SUSPEND:

  		val = 0x00;
  		chip->active &= ~ADC1;
  		break;
  	default:
  		return -EINVAL;
  	}
  	snd_es1938_write(chip, ESS_CMD_DMACONTROL, val);
  	return 0;
  }

  static int snd_es1938_playback1_trigger(struct snd_pcm_substream *substream,

  					int cmd)
  {

  	struct es1938 *chip = snd_pcm_substream_chip(substream);

  	switch (cmd) {
  	case SNDRV_PCM_TRIGGER_START:

  	case SNDRV_PCM_TRIGGER_RESUME:

  		/* According to the documentation this should be:
  		   0x13 but that value may randomly swap stereo channels */
                  snd_es1938_mixer_write(chip, ESSSB_IREG_AUDIO2CONTROL1, 0x92);
                  udelay(10);
  		snd_es1938_mixer_write(chip, ESSSB_IREG_AUDIO2CONTROL1, 0x93);
                  /* This two stage init gives the FIFO -> DAC connection time to
                   * settle before first data from DMA flows in.  This should ensure
                   * no swapping of stereo channels.  Report a bug if otherwise :-) */
  		outb(0x0a, SLIO_REG(chip, AUDIO2MODE));
  		chip->active |= DAC2;
  		break;
  	case SNDRV_PCM_TRIGGER_STOP:

  	case SNDRV_PCM_TRIGGER_SUSPEND:

  		outb(0, SLIO_REG(chip, AUDIO2MODE));
  		snd_es1938_mixer_write(chip, ESSSB_IREG_AUDIO2CONTROL1, 0);
  		chip->active &= ~DAC2;
  		break;
  	default:
  		return -EINVAL;
  	}
  	return 0;
  }

  static int snd_es1938_playback2_trigger(struct snd_pcm_substream *substream,

  					int cmd)
  {

  	struct es1938 *chip = snd_pcm_substream_chip(substream);

  	int val;
  	switch (cmd) {
  	case SNDRV_PCM_TRIGGER_START:

  	case SNDRV_PCM_TRIGGER_RESUME:

  		val = 5;
  		chip->active |= DAC1;
  		break;
  	case SNDRV_PCM_TRIGGER_STOP:

  	case SNDRV_PCM_TRIGGER_SUSPEND:

  		val = 0;
  		chip->active &= ~DAC1;
  		break;
  	default:
  		return -EINVAL;
  	}
  	snd_es1938_write(chip, ESS_CMD_DMACONTROL, val);
  	return 0;
  }

  static int snd_es1938_playback_trigger(struct snd_pcm_substream *substream,

  				       int cmd)
  {
  	switch (substream->number) {
  	case 0:
  		return snd_es1938_playback1_trigger(substream, cmd);
  	case 1:
  		return snd_es1938_playback2_trigger(substream, cmd);
  	}
  	snd_BUG();
  	return -EINVAL;
  }
  
  /* --------------------------------------------------------------------
   * First channel for Extended Mode Audio 1 ADC Operation
   * --------------------------------------------------------------------*/

  static int snd_es1938_capture_prepare(struct snd_pcm_substream *substream)

  {

  	struct es1938 *chip = snd_pcm_substream_chip(substream);
  	struct snd_pcm_runtime *runtime = substream->runtime;

  	int u, is8, mono;
  	unsigned int size = snd_pcm_lib_buffer_bytes(substream);
  	unsigned int count = snd_pcm_lib_period_bytes(substream);
  
  	chip->dma1_size = size;
  	chip->dma1_start = runtime->dma_addr;
  
  	mono = (runtime->channels > 1) ? 0 : 1;
  	is8 = snd_pcm_format_width(runtime->format) == 16 ? 0 : 1;
  	u = snd_pcm_format_unsigned(runtime->format);
  
  	chip->dma1_shift = 2 - mono - is8;
  
  	snd_es1938_reset_fifo(chip);
  	
  	/* program type */
  	snd_es1938_bits(chip, ESS_CMD_ANALOGCONTROL, 0x03, (mono ? 2 : 1));
  
  	/* set clock and counters */
          snd_es1938_rate_set(chip, substream, ADC1);
  
  	count = 0x10000 - count;
  	snd_es1938_write(chip, ESS_CMD_DMACNTRELOADL, count & 0xff);
  	snd_es1938_write(chip, ESS_CMD_DMACNTRELOADH, count >> 8);
  
  	/* initialize and configure ADC */
  	snd_es1938_write(chip, ESS_CMD_SETFORMAT2, u ? 0x51 : 0x71);
  	snd_es1938_write(chip, ESS_CMD_SETFORMAT2, 0x90 | 
  		       (u ? 0x00 : 0x20) | 
  		       (is8 ? 0x00 : 0x04) | 
  		       (mono ? 0x40 : 0x08));
  
  	//	snd_es1938_reset_fifo(chip);	
  
  	/* 11. configure system interrupt controller and DMA controller */
  	snd_es1938_capture_setdma(chip);
  
  	return 0;
  }
  
  
  /* ------------------------------------------------------------------------------
   * Second Audio channel DAC Operation
   * ------------------------------------------------------------------------------*/

  static int snd_es1938_playback1_prepare(struct snd_pcm_substream *substream)

  {

  	struct es1938 *chip = snd_pcm_substream_chip(substream);
  	struct snd_pcm_runtime *runtime = substream->runtime;

  	int u, is8, mono;
  	unsigned int size = snd_pcm_lib_buffer_bytes(substream);
  	unsigned int count = snd_pcm_lib_period_bytes(substream);
  
  	chip->dma2_size = size;
  	chip->dma2_start = runtime->dma_addr;
  
  	mono = (runtime->channels > 1) ? 0 : 1;
  	is8 = snd_pcm_format_width(runtime->format) == 16 ? 0 : 1;
  	u = snd_pcm_format_unsigned(runtime->format);
  
  	chip->dma2_shift = 2 - mono - is8;
  
          snd_es1938_reset_fifo(chip);
  
  	/* set clock and counters */
          snd_es1938_rate_set(chip, substream, DAC2);
  
  	count >>= 1;
  	count = 0x10000 - count;
  	snd_es1938_mixer_write(chip, ESSSB_IREG_AUDIO2TCOUNTL, count & 0xff);
  	snd_es1938_mixer_write(chip, ESSSB_IREG_AUDIO2TCOUNTH, count >> 8);
  
  	/* initialize and configure Audio 2 DAC */

  	snd_es1938_mixer_write(chip, ESSSB_IREG_AUDIO2CONTROL2, 0x40 | (u ? 0 : 4) |
  			       (mono ? 0 : 2) | (is8 ? 0 : 1));

  
  	/* program DMA */
  	snd_es1938_playback1_setdma(chip);
  	
  	return 0;
  }

  static int snd_es1938_playback2_prepare(struct snd_pcm_substream *substream)

  {

  	struct es1938 *chip = snd_pcm_substream_chip(substream);
  	struct snd_pcm_runtime *runtime = substream->runtime;

  	int u, is8, mono;
  	unsigned int size = snd_pcm_lib_buffer_bytes(substream);
  	unsigned int count = snd_pcm_lib_period_bytes(substream);
  
  	chip->dma1_size = size;
  	chip->dma1_start = runtime->dma_addr;
  
  	mono = (runtime->channels > 1) ? 0 : 1;
  	is8 = snd_pcm_format_width(runtime->format) == 16 ? 0 : 1;
  	u = snd_pcm_format_unsigned(runtime->format);
  
  	chip->dma1_shift = 2 - mono - is8;
  
  	count = 0x10000 - count;
   
  	/* reset */
  	snd_es1938_reset_fifo(chip);
  	
  	snd_es1938_bits(chip, ESS_CMD_ANALOGCONTROL, 0x03, (mono ? 2 : 1));
  
  	/* set clock and counters */
          snd_es1938_rate_set(chip, substream, DAC1);
  	snd_es1938_write(chip, ESS_CMD_DMACNTRELOADL, count & 0xff);
  	snd_es1938_write(chip, ESS_CMD_DMACNTRELOADH, count >> 8);
  
  	/* initialized and configure DAC */
          snd_es1938_write(chip, ESS_CMD_SETFORMAT, u ? 0x80 : 0x00);
          snd_es1938_write(chip, ESS_CMD_SETFORMAT, u ? 0x51 : 0x71);
          snd_es1938_write(chip, ESS_CMD_SETFORMAT2, 
  			 0x90 | (mono ? 0x40 : 0x08) |
  			 (is8 ? 0x00 : 0x04) | (u ? 0x00 : 0x20));
  
  	/* program DMA */
  	snd_es1938_playback2_setdma(chip);
  	
  	return 0;
  }

  static int snd_es1938_playback_prepare(struct snd_pcm_substream *substream)

  {
  	switch (substream->number) {
  	case 0:
  		return snd_es1938_playback1_prepare(substream);
  	case 1:
  		return snd_es1938_playback2_prepare(substream);
  	}
  	snd_BUG();
  	return -EINVAL;
  }

  /* during the incrementing of dma counters the DMA register reads sometimes
     returns garbage. To ensure a valid hw pointer, the following checks which
     should be very unlikely to fail are used:
     - is the current DMA address in the valid DMA range ?
     - is the sum of DMA address and DMA counter pointing to the last DMA byte ?
     One can argue this could differ by one byte depending on which register is
     updated first, so the implementation below allows for that.
  */

  static snd_pcm_uframes_t snd_es1938_capture_pointer(struct snd_pcm_substream *substream)

  {

  	struct es1938 *chip = snd_pcm_substream_chip(substream);

  	size_t ptr;

  #if 0

  	size_t old, new;

  	/* This stuff is *needed*, don't ask why - AB */
  	old = inw(SLDM_REG(chip, DMACOUNT));
  	while ((new = inw(SLDM_REG(chip, DMACOUNT))) != old)
  		old = new;
  	ptr = chip->dma1_size - 1 - new;
  #else

  	size_t count;
  	unsigned int diff;
  
  	ptr = inl(SLDM_REG(chip, DMAADDR));
  	count = inw(SLDM_REG(chip, DMACOUNT));
  	diff = chip->dma1_start + chip->dma1_size - ptr - count;
  
  	if (diff > 3 || ptr < chip->dma1_start
  	      || ptr >= chip->dma1_start+chip->dma1_size)
  	  ptr = chip->last_capture_dmaaddr;            /* bad, use last saved */
  	else
  	  chip->last_capture_dmaaddr = ptr;            /* good, remember it */
  
  	ptr -= chip->dma1_start;

  #endif
  	return ptr >> chip->dma1_shift;
  }

  static snd_pcm_uframes_t snd_es1938_playback1_pointer(struct snd_pcm_substream *substream)

  {

  	struct es1938 *chip = snd_pcm_substream_chip(substream);

  	size_t ptr;
  #if 1
  	ptr = chip->dma2_size - inw(SLIO_REG(chip, AUDIO2DMACOUNT));
  #else
  	ptr = inl(SLIO_REG(chip, AUDIO2DMAADDR)) - chip->dma2_start;
  #endif
  	return ptr >> chip->dma2_shift;
  }

  static snd_pcm_uframes_t snd_es1938_playback2_pointer(struct snd_pcm_substream *substream)

  {

  	struct es1938 *chip = snd_pcm_substream_chip(substream);

  	size_t ptr;
  	size_t old, new;
  #if 1
  	/* This stuff is *needed*, don't ask why - AB */
  	old = inw(SLDM_REG(chip, DMACOUNT));
  	while ((new = inw(SLDM_REG(chip, DMACOUNT))) != old)
  		old = new;
  	ptr = chip->dma1_size - 1 - new;
  #else
  	ptr = inl(SLDM_REG(chip, DMAADDR)) - chip->dma1_start;
  #endif
  	return ptr >> chip->dma1_shift;
  }

  static snd_pcm_uframes_t snd_es1938_playback_pointer(struct snd_pcm_substream *substream)

  {
  	switch (substream->number) {
  	case 0:
  		return snd_es1938_playback1_pointer(substream);
  	case 1:
  		return snd_es1938_playback2_pointer(substream);
  	}
  	snd_BUG();
  	return -EINVAL;
  }

  static int snd_es1938_capture_copy(struct snd_pcm_substream *substream,

  				   int channel,
  				   snd_pcm_uframes_t pos,
  				   void __user *dst,
  				   snd_pcm_uframes_t count)
  {

  	struct snd_pcm_runtime *runtime = substream->runtime;
  	struct es1938 *chip = snd_pcm_substream_chip(substream);

  	pos <<= chip->dma1_shift;
  	count <<= chip->dma1_shift;

  	if (snd_BUG_ON(pos + count > chip->dma1_size))
  		return -EINVAL;

  	if (pos + count < chip->dma1_size) {
  		if (copy_to_user(dst, runtime->dma_area + pos + 1, count))
  			return -EFAULT;
  	} else {
  		if (copy_to_user(dst, runtime->dma_area + pos + 1, count - 1))
  			return -EFAULT;
  		if (put_user(runtime->dma_area[0], ((unsigned char __user *)dst) + count - 1))
  			return -EFAULT;
  	}
  	return 0;
  }
  
  /*
   * buffer management
   */

  static int snd_es1938_pcm_hw_params(struct snd_pcm_substream *substream,
  				    struct snd_pcm_hw_params *hw_params)

  
  {
  	int err;
  
  	if ((err = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params))) < 0)
  		return err;
  	return 0;
  }

  static int snd_es1938_pcm_hw_free(struct snd_pcm_substream *substream)

  {
  	return snd_pcm_lib_free_pages(substream);
  }
  
  /* ----------------------------------------------------------------------
   * Audio1 Capture (ADC)
   * ----------------------------------------------------------------------*/

  static struct snd_pcm_hardware snd_es1938_capture =

  {
  	.info =			(SNDRV_PCM_INFO_INTERLEAVED |
  				SNDRV_PCM_INFO_BLOCK_TRANSFER),

  	.formats =		(SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE |
  				 SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U16_LE),

  	.rates =		SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
  	.rate_min =		6000,
  	.rate_max =		48000,
  	.channels_min =		1,
  	.channels_max =		2,
          .buffer_bytes_max =	0x8000,       /* DMA controller screws on higher values */
  	.period_bytes_min =	64,
  	.period_bytes_max =	0x8000,
  	.periods_min =		1,
  	.periods_max =		1024,
  	.fifo_size =		256,
  };
  
  /* -----------------------------------------------------------------------
   * Audio2 Playback (DAC)
   * -----------------------------------------------------------------------*/

  static struct snd_pcm_hardware snd_es1938_playback =

  {
  	.info =			(SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
  				 SNDRV_PCM_INFO_BLOCK_TRANSFER |
  				 SNDRV_PCM_INFO_MMAP_VALID),

  	.formats =		(SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE |
  				 SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U16_LE),

  	.rates =		SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
  	.rate_min =		6000,
  	.rate_max =		48000,
  	.channels_min =		1,
  	.channels_max =		2,
          .buffer_bytes_max =	0x8000,       /* DMA controller screws on higher values */
  	.period_bytes_min =	64,
  	.period_bytes_max =	0x8000,
  	.periods_min =		1,
  	.periods_max =		1024,
  	.fifo_size =		256,
  };

  static int snd_es1938_capture_open(struct snd_pcm_substream *substream)

  {

  	struct es1938 *chip = snd_pcm_substream_chip(substream);
  	struct snd_pcm_runtime *runtime = substream->runtime;

  
  	if (chip->playback2_substream)
  		return -EAGAIN;
  	chip->capture_substream = substream;
  	runtime->hw = snd_es1938_capture;
  	snd_pcm_hw_constraint_ratnums(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
  				      &hw_constraints_clocks);
  	snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, 0xff00);
  	return 0;
  }

  static int snd_es1938_playback_open(struct snd_pcm_substream *substream)

  {

  	struct es1938 *chip = snd_pcm_substream_chip(substream);
  	struct snd_pcm_runtime *runtime = substream->runtime;

  
  	switch (substream->number) {
  	case 0:
  		chip->playback1_substream = substream;
  		break;
  	case 1:
  		if (chip->capture_substream)
  			return -EAGAIN;
  		chip->playback2_substream = substream;
  		break;
  	default:
  		snd_BUG();
  		return -EINVAL;
  	}
  	runtime->hw = snd_es1938_playback;
  	snd_pcm_hw_constraint_ratnums(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
  				      &hw_constraints_clocks);
  	snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, 0xff00);
  	return 0;
  }

  static int snd_es1938_capture_close(struct snd_pcm_substream *substream)

  {

  	struct es1938 *chip = snd_pcm_substream_chip(substream);

  
  	chip->capture_substream = NULL;
  	return 0;
  }

  static int snd_es1938_playback_close(struct snd_pcm_substream *substream)

  {

  	struct es1938 *chip = snd_pcm_substream_chip(substream);

  
  	switch (substream->number) {
  	case 0:
  		chip->playback1_substream = NULL;
  		break;
  	case 1:
  		chip->playback2_substream = NULL;
  		break;
  	default:
  		snd_BUG();
  		return -EINVAL;
  	}
  	return 0;
  }

  static struct snd_pcm_ops snd_es1938_playback_ops = {

  	.open =		snd_es1938_playback_open,
  	.close =	snd_es1938_playback_close,
  	.ioctl =	snd_pcm_lib_ioctl,
  	.hw_params =	snd_es1938_pcm_hw_params,
  	.hw_free =	snd_es1938_pcm_hw_free,
  	.prepare =	snd_es1938_playback_prepare,
  	.trigger =	snd_es1938_playback_trigger,
  	.pointer =	snd_es1938_playback_pointer,
  };

  static struct snd_pcm_ops snd_es1938_capture_ops = {

  	.open =		snd_es1938_capture_open,
  	.close =	snd_es1938_capture_close,
  	.ioctl =	snd_pcm_lib_ioctl,
  	.hw_params =	snd_es1938_pcm_hw_params,
  	.hw_free =	snd_es1938_pcm_hw_free,
  	.prepare =	snd_es1938_capture_prepare,
  	.trigger =	snd_es1938_capture_trigger,
  	.pointer =	snd_es1938_capture_pointer,
  	.copy =		snd_es1938_capture_copy,
  };

  static int __devinit snd_es1938_new_pcm(struct es1938 *chip, int device)

  {

  	struct snd_pcm *pcm;

  	int err;
  
  	if ((err = snd_pcm_new(chip->card, "es-1938-1946", device, 2, 1, &pcm)) < 0)
  		return err;
  	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_es1938_playback_ops);
  	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_es1938_capture_ops);
  	
  	pcm->private_data = chip;

  	pcm->info_flags = 0;
  	strcpy(pcm->name, "ESS Solo-1");
  
  	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
  					      snd_dma_pci_data(chip->pci), 64*1024, 64*1024);
  
  	chip->pcm = pcm;
  	return 0;
  }
  
  /* -------------------------------------------------------------------
   * 
   *                       *** Mixer part ***
   */

  static int snd_es1938_info_mux(struct snd_kcontrol *kcontrol,
  			       struct snd_ctl_elem_info *uinfo)

  {
  	static char *texts[8] = {
  		"Mic", "Mic Master", "CD", "AOUT",
  		"Mic1", "Mix", "Line", "Master"
  	};
  
  	uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
  	uinfo->count = 1;
  	uinfo->value.enumerated.items = 8;
  	if (uinfo->value.enumerated.item > 7)
  		uinfo->value.enumerated.item = 7;
  	strcpy(uinfo->value.enumerated.name, texts[uinfo->value.enumerated.item]);
  	return 0;
  }

  static int snd_es1938_get_mux(struct snd_kcontrol *kcontrol,
  			      struct snd_ctl_elem_value *ucontrol)

  {

  	struct es1938 *chip = snd_kcontrol_chip(kcontrol);

  	ucontrol->value.enumerated.item[0] = snd_es1938_mixer_read(chip, 0x1c) & 0x07;
  	return 0;
  }

  static int snd_es1938_put_mux(struct snd_kcontrol *kcontrol,
  			      struct snd_ctl_elem_value *ucontrol)

  {

  	struct es1938 *chip = snd_kcontrol_chip(kcontrol);

  	unsigned char val = ucontrol->value.enumerated.item[0];
  	
  	if (val > 7)
  		return -EINVAL;
  	return snd_es1938_mixer_bits(chip, 0x1c, 0x07, val) != val;
  }

  #define snd_es1938_info_spatializer_enable	snd_ctl_boolean_mono_info

  static int snd_es1938_get_spatializer_enable(struct snd_kcontrol *kcontrol,
  					     struct snd_ctl_elem_value *ucontrol)

  {

  	struct es1938 *chip = snd_kcontrol_chip(kcontrol);

  	unsigned char val = snd_es1938_mixer_read(chip, 0x50);
  	ucontrol->value.integer.value[0] = !!(val & 8);
  	return 0;
  }

  static int snd_es1938_put_spatializer_enable(struct snd_kcontrol *kcontrol,
  					     struct snd_ctl_elem_value *ucontrol)

  {

  	struct es1938 *chip = snd_kcontrol_chip(kcontrol);

  	unsigned char oval, nval;
  	int change;
  	nval = ucontrol->value.integer.value[0] ? 0x0c : 0x04;
  	oval = snd_es1938_mixer_read(chip, 0x50) & 0x0c;
  	change = nval != oval;
  	if (change) {
  		snd_es1938_mixer_write(chip, 0x50, nval & ~0x04);
  		snd_es1938_mixer_write(chip, 0x50, nval);
  	}
  	return change;
  }

  static int snd_es1938_info_hw_volume(struct snd_kcontrol *kcontrol,
  				     struct snd_ctl_elem_info *uinfo)

  {
  	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
  	uinfo->count = 2;
  	uinfo->value.integer.min = 0;
  	uinfo->value.integer.max = 63;
  	return 0;
  }

  static int snd_es1938_get_hw_volume(struct snd_kcontrol *kcontrol,
  				    struct snd_ctl_elem_value *ucontrol)

  {

  	struct es1938 *chip = snd_kcontrol_chip(kcontrol);

  	ucontrol->value.integer.value[0] = snd_es1938_mixer_read(chip, 0x61) & 0x3f;
  	ucontrol->value.integer.value[1] = snd_es1938_mixer_read(chip, 0x63) & 0x3f;
  	return 0;
  }

  #define snd_es1938_info_hw_switch		snd_ctl_boolean_stereo_info

  static int snd_es1938_get_hw_switch(struct snd_kcontrol *kcontrol,
  				    struct snd_ctl_elem_value *ucontrol)

  {

  	struct es1938 *chip = snd_kcontrol_chip(kcontrol);

  	ucontrol->value.integer.value[0] = !(snd_es1938_mixer_read(chip, 0x61) & 0x40);
  	ucontrol->value.integer.value[1] = !(snd_es1938_mixer_read(chip, 0x63) & 0x40);
  	return 0;
  }

  static void snd_es1938_hwv_free(struct snd_kcontrol *kcontrol)

  {

  	struct es1938 *chip = snd_kcontrol_chip(kcontrol);

  	chip->master_volume = NULL;
  	chip->master_switch = NULL;
  	chip->hw_volume = NULL;
  	chip->hw_switch = NULL;
  }

  static int snd_es1938_reg_bits(struct es1938 *chip, unsigned char reg,

  			       unsigned char mask, unsigned char val)
  {
  	if (reg < 0xa0)
  		return snd_es1938_mixer_bits(chip, reg, mask, val);
  	else
  		return snd_es1938_bits(chip, reg, mask, val);
  }

  static int snd_es1938_reg_read(struct es1938 *chip, unsigned char reg)

  {
  	if (reg < 0xa0)
  		return snd_es1938_mixer_read(chip, reg);
  	else
  		return snd_es1938_read(chip, reg);
  }

  #define ES1938_SINGLE_TLV(xname, xindex, reg, shift, mask, invert, xtlv)    \
  { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
    .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ,\
    .name = xname, .index = xindex, \
    .info = snd_es1938_info_single, \
    .get = snd_es1938_get_single, .put = snd_es1938_put_single, \
    .private_value = reg | (shift << 8) | (mask << 16) | (invert << 24), \
    .tlv = { .p = xtlv } }

  #define ES1938_SINGLE(xname, xindex, reg, shift, mask, invert) \
  { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
    .info = snd_es1938_info_single, \
    .get = snd_es1938_get_single, .put = snd_es1938_put_single, \
    .private_value = reg | (shift << 8) | (mask << 16) | (invert << 24) }

  static int snd_es1938_info_single(struct snd_kcontrol *kcontrol,
  				  struct snd_ctl_elem_info *uinfo)

  {
  	int mask = (kcontrol->private_value >> 16) & 0xff;
  
  	uinfo->type = mask == 1 ? SNDRV_CTL_ELEM_TYPE_BOOLEAN : SNDRV_CTL_ELEM_TYPE_INTEGER;
  	uinfo->count = 1;
  	uinfo->value.integer.min = 0;
  	uinfo->value.integer.max = mask;
  	return 0;
  }

  static int snd_es1938_get_single(struct snd_kcontrol *kcontrol,
  				 struct snd_ctl_elem_value *ucontrol)

  {

  	struct es1938 *chip = snd_kcontrol_chip(kcontrol);

  	int reg = kcontrol->private_value & 0xff;
  	int shift = (kcontrol->private_value >> 8) & 0xff;
  	int mask = (kcontrol->private_value >> 16) & 0xff;
  	int invert = (kcontrol->private_value >> 24) & 0xff;
  	int val;
  	
  	val = snd_es1938_reg_read(chip, reg);
  	ucontrol->value.integer.value[0] = (val >> shift) & mask;
  	if (invert)
  		ucontrol->value.integer.value[0] = mask - ucontrol->value.integer.value[0];
  	return 0;
  }

  static int snd_es1938_put_single(struct snd_kcontrol *kcontrol,
  				 struct snd_ctl_elem_value *ucontrol)

  {

  	struct es1938 *chip = snd_kcontrol_chip(kcontrol);

  	int reg = kcontrol->private_value & 0xff;
  	int shift = (kcontrol->private_value >> 8) & 0xff;
  	int mask = (kcontrol->private_value >> 16) & 0xff;
  	int invert = (kcontrol->private_value >> 24) & 0xff;
  	unsigned char val;
  	
  	val = (ucontrol->value.integer.value[0] & mask);
  	if (invert)
  		val = mask - val;
  	mask <<= shift;
  	val <<= shift;
  	return snd_es1938_reg_bits(chip, reg, mask, val) != val;
  }

  #define ES1938_DOUBLE_TLV(xname, xindex, left_reg, right_reg, shift_left, shift_right, mask, invert, xtlv) \
  { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, \
    .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ,\
    .name = xname, .index = xindex, \
    .info = snd_es1938_info_double, \
    .get = snd_es1938_get_double, .put = snd_es1938_put_double, \
    .private_value = left_reg | (right_reg << 8) | (shift_left << 16) | (shift_right << 19) | (mask << 24) | (invert << 22), \
    .tlv = { .p = xtlv } }

  #define ES1938_DOUBLE(xname, xindex, left_reg, right_reg, shift_left, shift_right, mask, invert) \
  { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
    .info = snd_es1938_info_double, \
    .get = snd_es1938_get_double, .put = snd_es1938_put_double, \
    .private_value = left_reg | (right_reg << 8) | (shift_left << 16) | (shift_right << 19) | (mask << 24) | (invert << 22) }

  static int snd_es1938_info_double(struct snd_kcontrol *kcontrol,
  				  struct snd_ctl_elem_info *uinfo)

  {
  	int mask = (kcontrol->private_value >> 24) & 0xff;
  
  	uinfo->type = mask == 1 ? SNDRV_CTL_ELEM_TYPE_BOOLEAN : SNDRV_CTL_ELEM_TYPE_INTEGER;
  	uinfo->count = 2;
  	uinfo->value.integer.min = 0;
  	uinfo->value.integer.max = mask;
  	return 0;
  }

  static int snd_es1938_get_double(struct snd_kcontrol *kcontrol,
  				 struct snd_ctl_elem_value *ucontrol)

  {

  	struct es1938 *chip = snd_kcontrol_chip(kcontrol);

  	int left_reg = kcontrol->private_value & 0xff;
  	int right_reg = (kcontrol->private_value >> 8) & 0xff;
  	int shift_left = (kcontrol->private_value >> 16) & 0x07;
  	int shift_right = (kcontrol->private_value >> 19) & 0x07;
  	int mask = (kcontrol->private_value >> 24) & 0xff;
  	int invert = (kcontrol->private_value >> 22) & 1;
  	unsigned char left, right;
  	
  	left = snd_es1938_reg_read(chip, left_reg);
  	if (left_reg != right_reg)
  		right = snd_es1938_reg_read(chip, right_reg);
  	else
  		right = left;
  	ucontrol->value.integer.value[0] = (left >> shift_left) & mask;
  	ucontrol->value.integer.value[1] = (right >> shift_right) & mask;
  	if (invert) {
  		ucontrol->value.integer.value[0] = mask - ucontrol->value.integer.value[0];
  		ucontrol->value.integer.value[1] = mask - ucontrol->value.integer.value[1];
  	}
  	return 0;
  }

  static int snd_es1938_put_double(struct snd_kcontrol *kcontrol,
  				 struct snd_ctl_elem_value *ucontrol)

  {

  	struct es1938 *chip = snd_kcontrol_chip(kcontrol);

  	int left_reg = kcontrol->private_value & 0xff;
  	int right_reg = (kcontrol->private_value >> 8) & 0xff;
  	int shift_left = (kcontrol->private_value >> 16) & 0x07;
  	int shift_right = (kcontrol->private_value >> 19) & 0x07;
  	int mask = (kcontrol->private_value >> 24) & 0xff;
  	int invert = (kcontrol->private_value >> 22) & 1;
  	int change;
  	unsigned char val1, val2, mask1, mask2;
  	
  	val1 = ucontrol->value.integer.value[0] & mask;
  	val2 = ucontrol->value.integer.value[1] & mask;
  	if (invert) {
  		val1 = mask - val1;
  		val2 = mask - val2;
  	}
  	val1 <<= shift_left;
  	val2 <<= shift_right;
  	mask1 = mask << shift_left;
  	mask2 = mask << shift_right;
  	if (left_reg != right_reg) {
  		change = 0;
  		if (snd_es1938_reg_bits(chip, left_reg, mask1, val1) != val1)
  			change = 1;
  		if (snd_es1938_reg_bits(chip, right_reg, mask2, val2) != val2)
  			change = 1;
  	} else {
  		change = (snd_es1938_reg_bits(chip, left_reg, mask1 | mask2, 
  					      val1 | val2) != (val1 | val2));
  	}
  	return change;
  }

  static unsigned int db_scale_master[] = {
  	TLV_DB_RANGE_HEAD(2),
  	0, 54, TLV_DB_SCALE_ITEM(-3600, 50, 1),
  	54, 63, TLV_DB_SCALE_ITEM(-900, 100, 0),
  };
  
  static unsigned int db_scale_audio1[] = {
  	TLV_DB_RANGE_HEAD(2),
  	0, 8, TLV_DB_SCALE_ITEM(-3300, 300, 1),
  	8, 15, TLV_DB_SCALE_ITEM(-900, 150, 0),
  };
  
  static unsigned int db_scale_audio2[] = {
  	TLV_DB_RANGE_HEAD(2),
  	0, 8, TLV_DB_SCALE_ITEM(-3450, 300, 1),
  	8, 15, TLV_DB_SCALE_ITEM(-1050, 150, 0),
  };
  
  static unsigned int db_scale_mic[] = {
  	TLV_DB_RANGE_HEAD(2),
  	0, 8, TLV_DB_SCALE_ITEM(-2400, 300, 1),
  	8, 15, TLV_DB_SCALE_ITEM(0, 150, 0),
  };
  
  static unsigned int db_scale_line[] = {
  	TLV_DB_RANGE_HEAD(2),
  	0, 8, TLV_DB_SCALE_ITEM(-3150, 300, 1),
  	8, 15, TLV_DB_SCALE_ITEM(-750, 150, 0),
  };

  static const DECLARE_TLV_DB_SCALE(db_scale_capture, 0, 150, 0);

  static struct snd_kcontrol_new snd_es1938_controls[] = {

  ES1938_DOUBLE_TLV("Master Playback Volume", 0, 0x60, 0x62, 0, 0, 63, 0,
  		  db_scale_master),

  ES1938_DOUBLE("Master Playback Switch", 0, 0x60, 0x62, 6, 6, 1, 1),
  {
  	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
  	.name = "Hardware Master Playback Volume",
  	.access = SNDRV_CTL_ELEM_ACCESS_READ,
  	.info = snd_es1938_info_hw_volume,
  	.get = snd_es1938_get_hw_volume,
  },
  {
  	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,

  	.access = (SNDRV_CTL_ELEM_ACCESS_READ |

  		   SNDRV_CTL_ELEM_ACCESS_TLV_READ),

  	.name = "Hardware Master Playback Switch",

  	.info = snd_es1938_info_hw_switch,
  	.get = snd_es1938_get_hw_switch,

  	.tlv = { .p = db_scale_master },

  },
  ES1938_SINGLE("Hardware Volume Split", 0, 0x64, 7, 1, 0),

  ES1938_DOUBLE_TLV("Line Playback Volume", 0, 0x3e, 0x3e, 4, 0, 15, 0,
  		  db_scale_line),

  ES1938_DOUBLE("CD Playback Volume", 0, 0x38, 0x38, 4, 0, 15, 0),

  ES1938_DOUBLE_TLV("FM Playback Volume", 0, 0x36, 0x36, 4, 0, 15, 0,
  		  db_scale_mic),
  ES1938_DOUBLE_TLV("Mono Playback Volume", 0, 0x6d, 0x6d, 4, 0, 15, 0,
  		  db_scale_line),
  ES1938_DOUBLE_TLV("Mic Playback Volume", 0, 0x1a, 0x1a, 4, 0, 15, 0,
  		  db_scale_mic),
  ES1938_DOUBLE_TLV("Aux Playback Volume", 0, 0x3a, 0x3a, 4, 0, 15, 0,
  		  db_scale_line),
  ES1938_DOUBLE_TLV("Capture Volume", 0, 0xb4, 0xb4, 4, 0, 15, 0,
  		  db_scale_capture),

  ES1938_SINGLE("Beep Volume", 0, 0x3c, 0, 7, 0),

  ES1938_SINGLE("Record Monitor", 0, 0xa8, 3, 1, 0),
  ES1938_SINGLE("Capture Switch", 0, 0x1c, 4, 1, 1),
  {
  	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
  	.name = "Capture Source",
  	.info = snd_es1938_info_mux,
  	.get = snd_es1938_get_mux,
  	.put = snd_es1938_put_mux,
  },

  ES1938_DOUBLE_TLV("Mono Input Playback Volume", 0, 0x6d, 0x6d, 4, 0, 15, 0,
  		  db_scale_line),
  ES1938_DOUBLE_TLV("PCM Capture Volume", 0, 0x69, 0x69, 4, 0, 15, 0,
  		  db_scale_audio2),
  ES1938_DOUBLE_TLV("Mic Capture Volume", 0, 0x68, 0x68, 4, 0, 15, 0,
  		  db_scale_mic),
  ES1938_DOUBLE_TLV("Line Capture Volume", 0, 0x6e, 0x6e, 4, 0, 15, 0,
  		  db_scale_line),
  ES1938_DOUBLE_TLV("FM Capture Volume", 0, 0x6b, 0x6b, 4, 0, 15, 0,
  		  db_scale_mic),
  ES1938_DOUBLE_TLV("Mono Capture Volume", 0, 0x6f, 0x6f, 4, 0, 15, 0,
  		  db_scale_line),
  ES1938_DOUBLE_TLV("CD Capture Volume", 0, 0x6a, 0x6a, 4, 0, 15, 0,
  		  db_scale_line),
  ES1938_DOUBLE_TLV("Aux Capture Volume", 0, 0x6c, 0x6c, 4, 0, 15, 0,
  		  db_scale_line),
  ES1938_DOUBLE_TLV("PCM Playback Volume", 0, 0x7c, 0x7c, 4, 0, 15, 0,
  		  db_scale_audio2),
  ES1938_DOUBLE_TLV("PCM Playback Volume", 1, 0x14, 0x14, 4, 0, 15, 0,
  		  db_scale_audio1),

  ES1938_SINGLE("3D Control - Level", 0, 0x52, 0, 63, 0),
  {
  	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
  	.name = "3D Control - Switch",
  	.info = snd_es1938_info_spatializer_enable,
  	.get = snd_es1938_get_spatializer_enable,
  	.put = snd_es1938_put_spatializer_enable,
  },
  ES1938_SINGLE("Mic Boost (+26dB)", 0, 0x7d, 3, 1, 0)
  };
  
  
  /* ---------------------------------------------------------------------------- */
  /* ---------------------------------------------------------------------------- */
  
  /*
   * initialize the chip - used by resume callback, too
   */

  static void snd_es1938_chip_init(struct es1938 *chip)

  {
  	/* reset chip */
  	snd_es1938_reset(chip);
  
  	/* configure native mode */
  
  	/* enable bus master */
  	pci_set_master(chip->pci);
  
  	/* disable legacy audio */
  	pci_write_config_word(chip->pci, SL_PCI_LEGACYCONTROL, 0x805f);
  
  	/* set DDMA base */
  	pci_write_config_word(chip->pci, SL_PCI_DDMACONTROL, chip->ddma_port | 1);
  
  	/* set DMA/IRQ policy */
  	pci_write_config_dword(chip->pci, SL_PCI_CONFIG, 0);
  
  	/* enable Audio 1, Audio 2, MPU401 IRQ and HW volume IRQ*/
  	outb(0xf0, SLIO_REG(chip, IRQCONTROL));
  
  	/* reset DMA */
  	outb(0, SLDM_REG(chip, DMACLEAR));
  }
  
  #ifdef CONFIG_PM
  /*
   * PM support
   */
  
  static unsigned char saved_regs[SAVED_REG_SIZE+1] = {
  	0x14, 0x1a, 0x1c, 0x3a, 0x3c, 0x3e, 0x36, 0x38,
  	0x50, 0x52, 0x60, 0x61, 0x62, 0x63, 0x64, 0x68,
  	0x69, 0x6a, 0x6b, 0x6d, 0x6e, 0x6f, 0x7c, 0x7d,
  	0xa8, 0xb4,
  };

  static int es1938_suspend(struct pci_dev *pci, pm_message_t state)

  {

  	struct snd_card *card = pci_get_drvdata(pci);
  	struct es1938 *chip = card->private_data;

  	unsigned char *s, *d;

  	snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);

  	snd_pcm_suspend_all(chip->pcm);
  
  	/* save mixer-related registers */
  	for (s = saved_regs, d = chip->saved_regs; *s; s++, d++)
  		*d = snd_es1938_reg_read(chip, *s);
  
  	outb(0x00, SLIO_REG(chip, IRQCONTROL)); /* disable irqs */

  	if (chip->irq >= 0) {

  		free_irq(chip->irq, chip);

  		chip->irq = -1;
  	}

  	pci_disable_device(pci);
  	pci_save_state(pci);

  	pci_set_power_state(pci, pci_choose_state(pci, state));

  	return 0;
  }

  static int es1938_resume(struct pci_dev *pci)

  {

  	struct snd_card *card = pci_get_drvdata(pci);
  	struct es1938 *chip = card->private_data;

  	unsigned char *s, *d;

  	pci_set_power_state(pci, PCI_D0);

  	pci_restore_state(pci);

  	if (pci_enable_device(pci) < 0) {
  		printk(KERN_ERR "es1938: pci_enable_device failed, "
  		       "disabling device
  ");
  		snd_card_disconnect(card);
  		return -EIO;
  	}
  
  	if (request_irq(pci->irq, snd_es1938_interrupt,

  			IRQF_SHARED, KBUILD_MODNAME, chip)) {

  		printk(KERN_ERR "es1938: unable to grab IRQ %d, "
  		       "disabling device
  ", pci->irq);
  		snd_card_disconnect(card);
  		return -EIO;
  	}

  	chip->irq = pci->irq;

  	snd_es1938_chip_init(chip);
  
  	/* restore mixer-related registers */
  	for (s = saved_regs, d = chip->saved_regs; *s; s++, d++) {
  		if (*s < 0xa0)
  			snd_es1938_mixer_write(chip, *s, *d);
  		else
  			snd_es1938_write(chip, *s, *d);
  	}

  	snd_power_change_state(card, SNDRV_CTL_POWER_D0);

  	return 0;
  }
  #endif /* CONFIG_PM */
  
  #ifdef SUPPORT_JOYSTICK

  static int __devinit snd_es1938_create_gameport(struct es1938 *chip)

  {
  	struct gameport *gp;
  
  	chip->gameport = gp = gameport_allocate_port();
  	if (!gp) {
  		printk(KERN_ERR "es1938: cannot allocate memory for gameport
  ");
  		return -ENOMEM;
  	}
  
  	gameport_set_name(gp, "ES1938");
  	gameport_set_phys(gp, "pci%s/gameport0", pci_name(chip->pci));
  	gameport_set_dev_parent(gp, &chip->pci->dev);
  	gp->io = chip->game_port;
  
  	gameport_register_port(gp);
  
  	return 0;
  }

  static void snd_es1938_free_gameport(struct es1938 *chip)

  {
  	if (chip->gameport) {
  		gameport_unregister_port(chip->gameport);
  		chip->gameport = NULL;
  	}
  }
  #else

  static inline int snd_es1938_create_gameport(struct es1938 *chip) { return -ENOSYS; }
  static inline void snd_es1938_free_gameport(struct es1938 *chip) { }

  #endif /* SUPPORT_JOYSTICK */

  static int snd_es1938_free(struct es1938 *chip)

  {
  	/* disable irqs */
  	outb(0x00, SLIO_REG(chip, IRQCONTROL));
  	if (chip->rmidi)
  		snd_es1938_mixer_bits(chip, ESSSB_IREG_MPU401CONTROL, 0x40, 0);
  
  	snd_es1938_free_gameport(chip);

  	if (chip->irq >= 0)

  		free_irq(chip->irq, chip);

  	pci_release_regions(chip->pci);
  	pci_disable_device(chip->pci);
  	kfree(chip);
  	return 0;
  }

  static int snd_es1938_dev_free(struct snd_device *device)

  {

  	struct es1938 *chip = device->device_data;

  	return snd_es1938_free(chip);
  }

  static int __devinit snd_es1938_create(struct snd_card *card,

  				    struct pci_dev * pci,

  				    struct es1938 ** rchip)

  {

  	struct es1938 *chip;

  	int err;

  	static struct snd_device_ops ops = {

  		.dev_free =	snd_es1938_dev_free,
  	};
  
  	*rchip = NULL;
  
  	/* enable PCI device */
  	if ((err = pci_enable_device(pci)) < 0)
  		return err;
          /* check, if we can restrict PCI DMA transfers to 24 bits */

  	if (pci_set_dma_mask(pci, DMA_BIT_MASK(24)) < 0 ||
  	    pci_set_consistent_dma_mask(pci, DMA_BIT_MASK(24)) < 0) {

  		snd_printk(KERN_ERR "architecture does not support 24bit PCI busmaster DMA
  ");

  		pci_disable_device(pci);
                  return -ENXIO;
          }

  	chip = kzalloc(sizeof(*chip), GFP_KERNEL);

  	if (chip == NULL) {
  		pci_disable_device(pci);
  		return -ENOMEM;
  	}
  	spin_lock_init(&chip->reg_lock);
  	spin_lock_init(&chip->mixer_lock);
  	chip->card = card;
  	chip->pci = pci;

  	chip->irq = -1;

  	if ((err = pci_request_regions(pci, "ESS Solo-1")) < 0) {
  		kfree(chip);
  		pci_disable_device(pci);
  		return err;
  	}
  	chip->io_port = pci_resource_start(pci, 0);
  	chip->sb_port = pci_resource_start(pci, 1);
  	chip->vc_port = pci_resource_start(pci, 2);
  	chip->mpu_port = pci_resource_start(pci, 3);
  	chip->game_port = pci_resource_start(pci, 4);

  	if (request_irq(pci->irq, snd_es1938_interrupt, IRQF_SHARED,

  			KBUILD_MODNAME, chip)) {

  		snd_printk(KERN_ERR "unable to grab IRQ %d
  ", pci->irq);

  		snd_es1938_free(chip);
  		return -EBUSY;
  	}
  	chip->irq = pci->irq;
  #ifdef ES1938_DDEBUG

  	snd_printk(KERN_DEBUG "create: io: 0x%lx, sb: 0x%lx, vc: 0x%lx, mpu: 0x%lx, game: 0x%lx
  ",

  		   chip->io_port, chip->sb_port, chip->vc_port, chip->mpu_port, chip->game_port);
  #endif
  
  	chip->ddma_port = chip->vc_port + 0x00;		/* fix from Thomas Sailer */
  
  	snd_es1938_chip_init(chip);

  	if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
  		snd_es1938_free(chip);
  		return err;
  	}
  
  	snd_card_set_dev(card, &pci->dev);
  
  	*rchip = chip;
  	return 0;
  }
  
  /* --------------------------------------------------------------------
   * Interrupt handler
   * -------------------------------------------------------------------- */

  static irqreturn_t snd_es1938_interrupt(int irq, void *dev_id)

  {

  	struct es1938 *chip = dev_id;

  	unsigned char status, audiostatus;
  	int handled = 0;
  
  	status = inb(SLIO_REG(chip, IRQCONTROL));
  #if 0

  	printk(KERN_DEBUG "Es1938debug - interrupt status: =0x%x
  ", status);

  #endif
  	
  	/* AUDIO 1 */
  	if (status & 0x10) {
  #if 0

                  printk(KERN_DEBUG
  		       "Es1938debug - AUDIO channel 1 interrupt
  ");
  		printk(KERN_DEBUG
  		       "Es1938debug - AUDIO channel 1 DMAC DMA count: %u
  ",

  		       inw(SLDM_REG(chip, DMACOUNT)));

  		printk(KERN_DEBUG
  		       "Es1938debug - AUDIO channel 1 DMAC DMA base: %u
  ",

  		       inl(SLDM_REG(chip, DMAADDR)));

  		printk(KERN_DEBUG
  		       "Es1938debug - AUDIO channel 1 DMAC DMA status: 0x%x
  ",

  		       inl(SLDM_REG(chip, DMASTATUS)));

  #endif
  		/* clear irq */
  		handled = 1;
  		audiostatus = inb(SLSB_REG(chip, STATUS));
  		if (chip->active & ADC1)
  			snd_pcm_period_elapsed(chip->capture_substream);
  		else if (chip->active & DAC1)
  			snd_pcm_period_elapsed(chip->playback2_substream);
  	}
  	
  	/* AUDIO 2 */
  	if (status & 0x20) {
  #if 0

                  printk(KERN_DEBUG
  		       "Es1938debug - AUDIO channel 2 interrupt
  ");
  		printk(KERN_DEBUG
  		       "Es1938debug - AUDIO channel 2 DMAC DMA count: %u
  ",

  		       inw(SLIO_REG(chip, AUDIO2DMACOUNT)));

  		printk(KERN_DEBUG
  		       "Es1938debug - AUDIO channel 2 DMAC DMA base: %u
  ",

  		       inl(SLIO_REG(chip, AUDIO2DMAADDR)));

  
  #endif
  		/* clear irq */
  		handled = 1;
  		snd_es1938_mixer_bits(chip, ESSSB_IREG_AUDIO2CONTROL2, 0x80, 0);
  		if (chip->active & DAC2)
  			snd_pcm_period_elapsed(chip->playback1_substream);
  	}
  
  	/* Hardware volume */
  	if (status & 0x40) {
  		int split = snd_es1938_mixer_read(chip, 0x64) & 0x80;
  		handled = 1;
  		snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE, &chip->hw_switch->id);
  		snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE, &chip->hw_volume->id);
  		if (!split) {

  			snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
  				       &chip->master_switch->id);
  			snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
  				       &chip->master_volume->id);

  		}
  		/* ack interrupt */
  		snd_es1938_mixer_write(chip, 0x66, 0x00);
  	}
  
  	/* MPU401 */
  	if (status & 0x80) {
  		// the following line is evil! It switches off MIDI interrupt handling after the first interrupt received.
  		// replacing the last 0 by 0x40 works for ESS-Solo1, but just doing nothing works as well!
  		// andreas@flying-snail.de
  		// snd_es1938_mixer_bits(chip, ESSSB_IREG_MPU401CONTROL, 0x40, 0); /* ack? */
  		if (chip->rmidi) {
  			handled = 1;

  			snd_mpu401_uart_interrupt(irq, chip->rmidi->private_data);

  		}
  	}
  	return IRQ_RETVAL(handled);
  }
  
  #define ES1938_DMA_SIZE 64

  static int __devinit snd_es1938_mixer(struct es1938 *chip)

  {

  	struct snd_card *card;

  	unsigned int idx;
  	int err;
  
  	card = chip->card;
  
  	strcpy(card->mixername, "ESS Solo-1");
  
  	for (idx = 0; idx < ARRAY_SIZE(snd_es1938_controls); idx++) {

  		struct snd_kcontrol *kctl;

  		kctl = snd_ctl_new1(&snd_es1938_controls[idx], chip);
  		switch (idx) {
  			case 0:
  				chip->master_volume = kctl;
  				kctl->private_free = snd_es1938_hwv_free;
  				break;
  			case 1:
  				chip->master_switch = kctl;
  				kctl->private_free = snd_es1938_hwv_free;
  				break;
  			case 2:
  				chip->hw_volume = kctl;
  				kctl->private_free = snd_es1938_hwv_free;
  				break;
  			case 3:
  				chip->hw_switch = kctl;
  				kctl->private_free = snd_es1938_hwv_free;
  				break;
  			}
  		if ((err = snd_ctl_add(card, kctl)) < 0)
  			return err;
  	}
  	return 0;
  }
         
  
  static int __devinit snd_es1938_probe(struct pci_dev *pci,
  				      const struct pci_device_id *pci_id)
  {
  	static int dev;

  	struct snd_card *card;
  	struct es1938 *chip;
  	struct snd_opl3 *opl3;

  	int idx, err;
  
  	if (dev >= SNDRV_CARDS)
  		return -ENODEV;
  	if (!enable[dev]) {
  		dev++;
  		return -ENOENT;
  	}

  	err = snd_card_create(index[dev], id[dev], THIS_MODULE, 0, &card);
  	if (err < 0)
  		return err;

  	for (idx = 0; idx < 5; idx++) {
  		if (pci_resource_start(pci, idx) == 0 ||
  		    !(pci_resource_flags(pci, idx) & IORESOURCE_IO)) {
  		    	snd_card_free(card);
  		    	return -ENODEV;
  		}
  	}
  	if ((err = snd_es1938_create(card, pci, &chip)) < 0) {
  		snd_card_free(card);
  		return err;
  	}

  	card->private_data = chip;

  
  	strcpy(card->driver, "ES1938");
  	strcpy(card->shortname, "ESS ES1938 (Solo-1)");
  	sprintf(card->longname, "%s rev %i, irq %i",
  		card->shortname,
  		chip->revision,
  		chip->irq);
  
  	if ((err = snd_es1938_new_pcm(chip, 0)) < 0) {
  		snd_card_free(card);
  		return err;
  	}
  	if ((err = snd_es1938_mixer(chip)) < 0) {
  		snd_card_free(card);
  		return err;
  	}
  	if (snd_opl3_create(card,
  			    SLSB_REG(chip, FMLOWADDR),
  			    SLSB_REG(chip, FMHIGHADDR),
  			    OPL3_HW_OPL3, 1, &opl3) < 0) {
  		printk(KERN_ERR "es1938: OPL3 not detected at 0x%lx
  ",
  			   SLSB_REG(chip, FMLOWADDR));
  	} else {
  	        if ((err = snd_opl3_timer_new(opl3, 0, 1)) < 0) {
  	                snd_card_free(card);
  	                return err;
  		}
  	        if ((err = snd_opl3_hwdep_new(opl3, 0, 1, NULL)) < 0) {
  	                snd_card_free(card);
  	                return err;
  		}
  	}
  	if (snd_mpu401_uart_new(card, 0, MPU401_HW_MPU401,

  				chip->mpu_port,
  				MPU401_INFO_INTEGRATED | MPU401_INFO_IRQ_HOOK,
  				-1, &chip->rmidi) < 0) {

  		printk(KERN_ERR "es1938: unable to initialize MPU-401
  ");
  	} else {
  		// this line is vital for MIDI interrupt handling on ess-solo1
  		// andreas@flying-snail.de
  		snd_es1938_mixer_bits(chip, ESSSB_IREG_MPU401CONTROL, 0x40, 0x40);
  	}
  
  	snd_es1938_create_gameport(chip);
  
  	if ((err = snd_card_register(card)) < 0) {
  		snd_card_free(card);
  		return err;
  	}
  
  	pci_set_drvdata(pci, card);
  	dev++;
  	return 0;
  }
  
  static void __devexit snd_es1938_remove(struct pci_dev *pci)
  {
  	snd_card_free(pci_get_drvdata(pci));
  	pci_set_drvdata(pci, NULL);
  }
  
  static struct pci_driver driver = {

  	.name = KBUILD_MODNAME,

  	.id_table = snd_es1938_ids,
  	.probe = snd_es1938_probe,
  	.remove = __devexit_p(snd_es1938_remove),

  #ifdef CONFIG_PM
  	.suspend = es1938_suspend,
  	.resume = es1938_resume,
  #endif

  };
  
  static int __init alsa_card_es1938_init(void)
  {

  	return pci_register_driver(&driver);

  }
  
  static void __exit alsa_card_es1938_exit(void)
  {
  	pci_unregister_driver(&driver);
  }
  
  module_init(alsa_card_es1938_init)
  module_exit(alsa_card_es1938_exit)