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es1938.c

/*
 *  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/moduleparam.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 int 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 struct pci_device_id snd_es1938_ids[] = {
        { 0x125d, 0x1969, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 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\n", 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\n", 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\n",
                     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)\n", 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\n", 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\n", 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\n", 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\n",
                     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\n");

     __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("PC Speaker 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\n");
            snd_card_disconnect(card);
            return -EIO;
      }

      if (request_irq(pci->irq, snd_es1938_interrupt,
                  IRQF_SHARED, "ES1938", chip)) {
            printk(KERN_ERR "es1938: unable to grab IRQ %d, "
                   "disabling device\n", 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\n");
            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\n");
            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,
                  "ES1938", chip)) {
            snd_printk(KERN_ERR "unable to grab IRQ %d\n", 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\n",
               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\n", status);
#endif
      
      /* AUDIO 1 */
      if (status & 0x10) {
#if 0
                printk(KERN_DEBUG
                   "Es1938debug - AUDIO channel 1 interrupt\n");
            printk(KERN_DEBUG
                   "Es1938debug - AUDIO channel 1 DMAC DMA count: %u\n",
                   inw(SLDM_REG(chip, DMACOUNT)));
            printk(KERN_DEBUG
                   "Es1938debug - AUDIO channel 1 DMAC DMA base: %u\n",
                   inl(SLDM_REG(chip, DMAADDR)));
            printk(KERN_DEBUG
                   "Es1938debug - AUDIO channel 1 DMAC DMA status: 0x%x\n",
                   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\n");
            printk(KERN_DEBUG
                   "Es1938debug - AUDIO channel 2 DMAC DMA count: %u\n",
                   inw(SLIO_REG(chip, AUDIO2DMACOUNT)));
            printk(KERN_DEBUG
                   "Es1938debug - AUDIO channel 2 DMAC DMA base: %u\n",
                   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\n",
                     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,
                        chip->irq, 0, &chip->rmidi) < 0) {
            printk(KERN_ERR "es1938: unable to initialize MPU-401\n");
      } 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 = "ESS ES1938 (Solo-1)",
      .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)

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