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als4000.c

/*
 *  card-als4000.c - driver for Avance Logic ALS4000 based soundcards.
 *  Copyright (C) 2000 by Bart Hartgers <bart@etpmod.phys.tue.nl>,
 *                  Jaroslav Kysela <perex@perex.cz>
 *  Copyright (C) 2002 by Andreas Mohr <hw7oshyuv3001@sneakemail.com>
 *
 *  Framework borrowed from Massimo Piccioni's card-als100.c.
 *
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.

 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 * NOTES
 *
 *  Since Avance does not provide any meaningful documentation, and I
 *  bought an ALS4000 based soundcard, I was forced to base this driver
 *  on reverse engineering.
 *
 *  Note: this is no longer true. Pretty verbose chip docu (ALS4000a.PDF)
 *  can be found on the ALSA web site.
 *
 *  The ALS4000 seems to be the PCI-cousin of the ALS100. It contains an
 *  ALS100-like SB DSP/mixer, an OPL3 synth, a MPU401 and a gameport 
 *  interface. These subsystems can be mapped into ISA io-port space, 
 *  using the PCI-interface. In addition, the PCI-bit provides DMA and IRQ 
 *  services to the subsystems.
 * 
 * While ALS4000 is very similar to a SoundBlaster, the differences in
 * DMA and capturing require more changes to the SoundBlaster than
 * desirable, so I made this separate driver.
 * 
 * The ALS4000 can do real full duplex playback/capture.
 *
 * FMDAC:
 * - 0x4f -> port 0x14
 * - port 0x15 |= 1
 *
 * Enable/disable 3D sound:
 * - 0x50 -> port 0x14
 * - change bit 6 (0x40) of port 0x15
 *
 * Set QSound:
 * - 0xdb -> port 0x14
 * - set port 0x15:
 *   0x3e (mode 3), 0x3c (mode 2), 0x3a (mode 1), 0x38 (mode 0)
 *
 * Set KSound:
 * - value -> some port 0x0c0d
 *
 * ToDo:
 * - Proper shared IRQ handling?
 * - power management? (card can do voice wakeup according to datasheet!!)
 */

#include <asm/io.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/gameport.h>
#include <linux/moduleparam.h>
#include <linux/dma-mapping.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/rawmidi.h>
#include <sound/mpu401.h>
#include <sound/opl3.h>
#include <sound/sb.h>
#include <sound/initval.h>

MODULE_AUTHOR("Bart Hartgers <bart@etpmod.phys.tue.nl>");
MODULE_DESCRIPTION("Avance Logic ALS4000");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("{{Avance Logic,ALS4000}}");

#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 */
#ifdef SUPPORT_JOYSTICK
static int joystick_port[SNDRV_CARDS];
#endif

module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for ALS4000 soundcard.");
module_param_array(id, charp, NULL, 0444);
MODULE_PARM_DESC(id, "ID string for ALS4000 soundcard.");
module_param_array(enable, bool, NULL, 0444);
MODULE_PARM_DESC(enable, "Enable ALS4000 soundcard.");
#ifdef SUPPORT_JOYSTICK
module_param_array(joystick_port, int, NULL, 0444);
MODULE_PARM_DESC(joystick_port, "Joystick port address for ALS4000 soundcard. (0 = disabled)");
#endif

struct snd_card_als4000 {
      /* most frequent access first */
      unsigned long gcr;
      struct pci_dev *pci;
      struct snd_sb *chip;
#ifdef SUPPORT_JOYSTICK
      struct gameport *gameport;
#endif
};

static struct pci_device_id snd_als4000_ids[] = {
      { 0x4005, 0x4000, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, },   /* ALS4000 */
      { 0, }
};

MODULE_DEVICE_TABLE(pci, snd_als4000_ids);

static inline void snd_als4000_gcr_write_addr(unsigned long port, u32 reg, u32 val)
{
      outb(reg, port+0x0c);
      outl(val, port+0x08);
}

static inline void snd_als4000_gcr_write(struct snd_sb *sb, u32 reg, u32 val)
{
      snd_als4000_gcr_write_addr(sb->alt_port, reg, val);
}     

static inline u32 snd_als4000_gcr_read_addr(unsigned long port, u32 reg)
{
      outb(reg, port+0x0c);
      return inl(port+0x08);
}

static inline u32 snd_als4000_gcr_read(struct snd_sb *sb, u32 reg)
{
      return snd_als4000_gcr_read_addr(sb->alt_port, reg);
}

static void snd_als4000_set_rate(struct snd_sb *chip, unsigned int rate)
{
      if (!(chip->mode & SB_RATE_LOCK)) {
            snd_sbdsp_command(chip, SB_DSP_SAMPLE_RATE_OUT);
            snd_sbdsp_command(chip, rate>>8);
            snd_sbdsp_command(chip, rate);
      }
}

static inline void snd_als4000_set_capture_dma(struct snd_sb *chip,
                                     dma_addr_t addr, unsigned size)
{
      snd_als4000_gcr_write(chip, 0xa2, addr);
      snd_als4000_gcr_write(chip, 0xa3, (size-1));
}

static inline void snd_als4000_set_playback_dma(struct snd_sb *chip,
                                    dma_addr_t addr, unsigned size)
{
      snd_als4000_gcr_write(chip, 0x91, addr);
      snd_als4000_gcr_write(chip, 0x92, (size-1)|0x180000);
}

#define ALS4000_FORMAT_SIGNED (1<<0)
#define ALS4000_FORMAT_16BIT  (1<<1)
#define ALS4000_FORMAT_STEREO (1<<2)

static int snd_als4000_get_format(struct snd_pcm_runtime *runtime)
{
      int result;

      result = 0;
      if (snd_pcm_format_signed(runtime->format))
            result |= ALS4000_FORMAT_SIGNED;
      if (snd_pcm_format_physical_width(runtime->format) == 16)
            result |= ALS4000_FORMAT_16BIT;
      if (runtime->channels > 1)
            result |= ALS4000_FORMAT_STEREO;
      return result;
}

/* structure for setting up playback */
static const struct {
      unsigned char dsp_cmd, dma_on, dma_off, format;
} playback_cmd_vals[]={
/* ALS4000_FORMAT_U8_MONO */
{ SB_DSP4_OUT8_AI, SB_DSP_DMA8_ON, SB_DSP_DMA8_OFF, SB_DSP4_MODE_UNS_MONO },
/* ALS4000_FORMAT_S8_MONO */  
{ SB_DSP4_OUT8_AI, SB_DSP_DMA8_ON, SB_DSP_DMA8_OFF, SB_DSP4_MODE_SIGN_MONO },
/* ALS4000_FORMAT_U16L_MONO */
{ SB_DSP4_OUT16_AI, SB_DSP_DMA16_ON, SB_DSP_DMA16_OFF, SB_DSP4_MODE_UNS_MONO },
/* ALS4000_FORMAT_S16L_MONO */
{ SB_DSP4_OUT16_AI, SB_DSP_DMA16_ON, SB_DSP_DMA16_OFF, SB_DSP4_MODE_SIGN_MONO },
/* ALS4000_FORMAT_U8_STEREO */
{ SB_DSP4_OUT8_AI, SB_DSP_DMA8_ON, SB_DSP_DMA8_OFF, SB_DSP4_MODE_UNS_STEREO },
/* ALS4000_FORMAT_S8_STEREO */      
{ SB_DSP4_OUT8_AI, SB_DSP_DMA8_ON, SB_DSP_DMA8_OFF, SB_DSP4_MODE_SIGN_STEREO },
/* ALS4000_FORMAT_U16L_STEREO */
{ SB_DSP4_OUT16_AI, SB_DSP_DMA16_ON, SB_DSP_DMA16_OFF, SB_DSP4_MODE_UNS_STEREO },
/* ALS4000_FORMAT_S16L_STEREO */
{ SB_DSP4_OUT16_AI, SB_DSP_DMA16_ON, SB_DSP_DMA16_OFF, SB_DSP4_MODE_SIGN_STEREO },
};
#define playback_cmd(chip) (playback_cmd_vals[(chip)->playback_format])

/* structure for setting up capture */
enum { CMD_WIDTH8=0x04, CMD_SIGNED=0x10, CMD_MONO=0x80, CMD_STEREO=0xA0 };
static const unsigned char capture_cmd_vals[]=
{
CMD_WIDTH8|CMD_MONO,                /* ALS4000_FORMAT_U8_MONO */
CMD_WIDTH8|CMD_SIGNED|CMD_MONO,           /* ALS4000_FORMAT_S8_MONO */  
CMD_MONO,                     /* ALS4000_FORMAT_U16L_MONO */
CMD_SIGNED|CMD_MONO,                /* ALS4000_FORMAT_S16L_MONO */
CMD_WIDTH8|CMD_STEREO,              /* ALS4000_FORMAT_U8_STEREO */
CMD_WIDTH8|CMD_SIGNED|CMD_STEREO,   /* ALS4000_FORMAT_S8_STEREO */      
CMD_STEREO,                   /* ALS4000_FORMAT_U16L_STEREO */
CMD_SIGNED|CMD_STEREO,              /* ALS4000_FORMAT_S16L_STEREO */
};    
#define capture_cmd(chip) (capture_cmd_vals[(chip)->capture_format])

static int snd_als4000_hw_params(struct snd_pcm_substream *substream,
                         struct snd_pcm_hw_params *hw_params)
{
      return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
}

static int snd_als4000_hw_free(struct snd_pcm_substream *substream)
{
      snd_pcm_lib_free_pages(substream);
      return 0;
}

static int snd_als4000_capture_prepare(struct snd_pcm_substream *substream)
{
      struct snd_sb *chip = snd_pcm_substream_chip(substream);
      struct snd_pcm_runtime *runtime = substream->runtime;
      unsigned long size;
      unsigned count;

      chip->capture_format = snd_als4000_get_format(runtime);
            
      size = snd_pcm_lib_buffer_bytes(substream);
      count = snd_pcm_lib_period_bytes(substream);
      
      if (chip->capture_format & ALS4000_FORMAT_16BIT)
            count >>=1;
      count--;

      spin_lock_irq(&chip->reg_lock);
      snd_als4000_set_rate(chip, runtime->rate);
      snd_als4000_set_capture_dma(chip, runtime->dma_addr, size);
      spin_unlock_irq(&chip->reg_lock);
      spin_lock_irq(&chip->mixer_lock);
      snd_sbmixer_write(chip, 0xdc, count);
      snd_sbmixer_write(chip, 0xdd, count>>8);
      spin_unlock_irq(&chip->mixer_lock);
      return 0;
}

static int snd_als4000_playback_prepare(struct snd_pcm_substream *substream)
{
      struct snd_sb *chip = snd_pcm_substream_chip(substream);
      struct snd_pcm_runtime *runtime = substream->runtime;
      unsigned long size;
      unsigned count;

      chip->playback_format = snd_als4000_get_format(runtime);
      
      size = snd_pcm_lib_buffer_bytes(substream);
      count = snd_pcm_lib_period_bytes(substream);
      
      if (chip->playback_format & ALS4000_FORMAT_16BIT)
            count >>=1;
      count--;
      
      /* FIXME: from second playback on, there's a lot more clicks and pops
       * involved here than on first playback. Fiddling with
       * tons of different settings didn't help (DMA, speaker on/off,
       * reordering, ...). Something seems to get enabled on playback
       * that I haven't found out how to disable again, which then causes
       * the switching pops to reach the speakers the next time here. */
      spin_lock_irq(&chip->reg_lock);
      snd_als4000_set_rate(chip, runtime->rate);
      snd_als4000_set_playback_dma(chip, runtime->dma_addr, size);
      
      /* SPEAKER_ON not needed, since dma_on seems to also enable speaker */
      /* snd_sbdsp_command(chip, SB_DSP_SPEAKER_ON); */
      snd_sbdsp_command(chip, playback_cmd(chip).dsp_cmd);
      snd_sbdsp_command(chip, playback_cmd(chip).format);
      snd_sbdsp_command(chip, count);
      snd_sbdsp_command(chip, count>>8);
      snd_sbdsp_command(chip, playback_cmd(chip).dma_off);  
      spin_unlock_irq(&chip->reg_lock);
      
      return 0;
}

static int snd_als4000_capture_trigger(struct snd_pcm_substream *substream, int cmd)
{
      struct snd_sb *chip = snd_pcm_substream_chip(substream);
      int result = 0;
      
      spin_lock(&chip->mixer_lock);
      switch (cmd) {
      case SNDRV_PCM_TRIGGER_START:
      case SNDRV_PCM_TRIGGER_RESUME:
            chip->mode |= SB_RATE_LOCK_CAPTURE;
            snd_sbmixer_write(chip, 0xde, capture_cmd(chip));
            break;
      case SNDRV_PCM_TRIGGER_STOP:
      case SNDRV_PCM_TRIGGER_SUSPEND:
            chip->mode &= ~SB_RATE_LOCK_CAPTURE;
            snd_sbmixer_write(chip, 0xde, 0);
            break;
      default:
            result = -EINVAL;
            break;
      }
      spin_unlock(&chip->mixer_lock);
      return result;
}

static int snd_als4000_playback_trigger(struct snd_pcm_substream *substream, int cmd)
{
      struct snd_sb *chip = snd_pcm_substream_chip(substream);
      int result = 0;

      spin_lock(&chip->reg_lock);
      switch (cmd) {
      case SNDRV_PCM_TRIGGER_START:
      case SNDRV_PCM_TRIGGER_RESUME:
            chip->mode |= SB_RATE_LOCK_PLAYBACK;
            snd_sbdsp_command(chip, playback_cmd(chip).dma_on);
            break;
      case SNDRV_PCM_TRIGGER_STOP:
      case SNDRV_PCM_TRIGGER_SUSPEND:
            snd_sbdsp_command(chip, playback_cmd(chip).dma_off);
            chip->mode &= ~SB_RATE_LOCK_PLAYBACK;
            break;
      default:
            result = -EINVAL;
            break;
      }
      spin_unlock(&chip->reg_lock);
      return result;
}

static snd_pcm_uframes_t snd_als4000_capture_pointer(struct snd_pcm_substream *substream)
{
      struct snd_sb *chip = snd_pcm_substream_chip(substream);
      unsigned int result;

      spin_lock(&chip->reg_lock);   
      result = snd_als4000_gcr_read(chip, 0xa4) & 0xffff;
      spin_unlock(&chip->reg_lock);
      return bytes_to_frames( substream->runtime, result );
}

static snd_pcm_uframes_t snd_als4000_playback_pointer(struct snd_pcm_substream *substream)
{
      struct snd_sb *chip = snd_pcm_substream_chip(substream);
      unsigned result;

      spin_lock(&chip->reg_lock);   
      result = snd_als4000_gcr_read(chip, 0xa0) & 0xffff;
      spin_unlock(&chip->reg_lock);
      return bytes_to_frames( substream->runtime, result );
}

/* FIXME: this IRQ routine doesn't really support IRQ sharing (we always
 * return IRQ_HANDLED no matter whether we actually had an IRQ flag or not).
 * ALS4000a.PDF writes that while ACKing IRQ in PCI block will *not* ACK
 * the IRQ in the SB core, ACKing IRQ in SB block *will* ACK the PCI IRQ
 * register (alt_port + 0x0e). Probably something could be optimized here to
 * query/write one register only...
 * And even if both registers need to be queried, then there's still the
 * question of whether it's actually correct to ACK PCI IRQ before reading
 * SB IRQ like we do now, since ALS4000a.PDF mentions that PCI IRQ will *clear*
 * SB IRQ status.
 * And do we *really* need the lock here for *reading* SB_DSP4_IRQSTATUS??
 * */
static irqreturn_t snd_als4000_interrupt(int irq, void *dev_id)
{
      struct snd_sb *chip = dev_id;
      unsigned gcr_status;
      unsigned sb_status;

      /* find out which bit of the ALS4000 produced the interrupt */
      gcr_status = inb(chip->alt_port + 0xe);

      if ((gcr_status & 0x80) && (chip->playback_substream)) /* playback */
            snd_pcm_period_elapsed(chip->playback_substream);
      if ((gcr_status & 0x40) && (chip->capture_substream)) /* capturing */
            snd_pcm_period_elapsed(chip->capture_substream);
      if ((gcr_status & 0x10) && (chip->rmidi)) /* MPU401 interrupt */
            snd_mpu401_uart_interrupt(irq, chip->rmidi->private_data);
      /* release the gcr */
      outb(gcr_status, chip->alt_port + 0xe);
      
      spin_lock(&chip->mixer_lock);
      sb_status = snd_sbmixer_read(chip, SB_DSP4_IRQSTATUS);
      spin_unlock(&chip->mixer_lock);
      
      if (sb_status & SB_IRQTYPE_8BIT) 
            snd_sb_ack_8bit(chip);
      if (sb_status & SB_IRQTYPE_16BIT) 
            snd_sb_ack_16bit(chip);
      if (sb_status & SB_IRQTYPE_MPUIN)
            inb(chip->mpu_port);
      if (sb_status & 0x20)
            inb(SBP(chip, RESET));
      return IRQ_HANDLED;
}

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

static struct snd_pcm_hardware snd_als4000_playback =
{
      .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
                         SNDRV_PCM_INFO_MMAP_VALID),
      .formats =        SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U8 |
                        SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_U16_LE,    /* formats */
      .rates =          SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
      .rate_min =       4000,
      .rate_max =       48000,
      .channels_min =         1,
      .channels_max =         2,
      .buffer_bytes_max =     65536,
      .period_bytes_min =     64,
      .period_bytes_max =     65536,
      .periods_min =          1,
      .periods_max =          1024,
      .fifo_size =            0
};

static struct snd_pcm_hardware snd_als4000_capture =
{
      .info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
                         SNDRV_PCM_INFO_MMAP_VALID),
      .formats =        SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U8 |
                        SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_U16_LE,    /* formats */
      .rates =          SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
      .rate_min =       4000,
      .rate_max =       48000,
      .channels_min =         1,
      .channels_max =         2,
      .buffer_bytes_max =     65536,
      .period_bytes_min =     64,
      .period_bytes_max =     65536,
      .periods_min =          1,
      .periods_max =          1024,
      .fifo_size =            0
};

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

static int snd_als4000_playback_open(struct snd_pcm_substream *substream)
{
      struct snd_sb *chip = snd_pcm_substream_chip(substream);
      struct snd_pcm_runtime *runtime = substream->runtime;

      chip->playback_substream = substream;
      runtime->hw = snd_als4000_playback;
      return 0;
}

static int snd_als4000_playback_close(struct snd_pcm_substream *substream)
{
      struct snd_sb *chip = snd_pcm_substream_chip(substream);

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

static int snd_als4000_capture_open(struct snd_pcm_substream *substream)
{
      struct snd_sb *chip = snd_pcm_substream_chip(substream);
      struct snd_pcm_runtime *runtime = substream->runtime;

      chip->capture_substream = substream;
      runtime->hw = snd_als4000_capture;
      return 0;
}

static int snd_als4000_capture_close(struct snd_pcm_substream *substream)
{
      struct snd_sb *chip = snd_pcm_substream_chip(substream);

      chip->capture_substream = NULL;
      snd_pcm_lib_free_pages(substream);
      return 0;
}

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

static struct snd_pcm_ops snd_als4000_playback_ops = {
      .open =           snd_als4000_playback_open,
      .close =    snd_als4000_playback_close,
      .ioctl =    snd_pcm_lib_ioctl,
      .hw_params =      snd_als4000_hw_params,
      .hw_free =  snd_als4000_hw_free,
      .prepare =  snd_als4000_playback_prepare,
      .trigger =  snd_als4000_playback_trigger,
      .pointer =  snd_als4000_playback_pointer
};

static struct snd_pcm_ops snd_als4000_capture_ops = {
      .open =           snd_als4000_capture_open,
      .close =    snd_als4000_capture_close,
      .ioctl =    snd_pcm_lib_ioctl,
      .hw_params =      snd_als4000_hw_params,
      .hw_free =  snd_als4000_hw_free,
      .prepare =  snd_als4000_capture_prepare,
      .trigger =  snd_als4000_capture_trigger,
      .pointer =  snd_als4000_capture_pointer
};

static int __devinit snd_als4000_pcm(struct snd_sb *chip, int device)
{
      struct snd_pcm *pcm;
      int err;

      if ((err = snd_pcm_new(chip->card, "ALS4000 DSP", device, 1, 1, &pcm)) < 0)
            return err;
      pcm->private_data = chip;
      pcm->info_flags = SNDRV_PCM_INFO_JOINT_DUPLEX;
      snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_als4000_playback_ops);
      snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_als4000_capture_ops);

      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;
}

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

static void snd_als4000_set_addr(unsigned long gcr,
                              unsigned int sb,
                              unsigned int mpu,
                              unsigned int opl,
                              unsigned int game)
{
      u32 confA = 0;
      u32 confB = 0;

      if (mpu > 0)
            confB |= (mpu | 1) << 16;
      if (sb > 0)
            confB |= (sb | 1);
      if (game > 0)
            confA |= (game | 1) << 16;
      if (opl > 0)      
            confA |= (opl | 1);
      snd_als4000_gcr_write_addr(gcr, 0xa8, confA);
      snd_als4000_gcr_write_addr(gcr, 0xa9, confB);
}

static void snd_als4000_configure(struct snd_sb *chip)
{
      unsigned tmp;
      int i;

      /* do some more configuration */
      spin_lock_irq(&chip->mixer_lock);
      tmp = snd_sbmixer_read(chip, 0xc0);
      snd_sbmixer_write(chip, 0xc0, tmp|0x80);
      /* always select DMA channel 0, since we do not actually use DMA */
      snd_sbmixer_write(chip, SB_DSP4_DMASETUP, SB_DMASETUP_DMA0);
      snd_sbmixer_write(chip, 0xc0, tmp&0x7f);
      spin_unlock_irq(&chip->mixer_lock);
      
      spin_lock_irq(&chip->reg_lock);
      /* magic number. Enables interrupts(?) */
      snd_als4000_gcr_write(chip, 0x8c, 0x28000);
      for(i = 0x91; i <= 0x96; ++i)
            snd_als4000_gcr_write(chip, i, 0);
      
      snd_als4000_gcr_write(chip, 0x99, snd_als4000_gcr_read(chip, 0x99));
      spin_unlock_irq(&chip->reg_lock);
}

#ifdef SUPPORT_JOYSTICK
static int __devinit snd_als4000_create_gameport(struct snd_card_als4000 *acard, int dev)
{
      struct gameport *gp;
      struct resource *r;
      int io_port;

      if (joystick_port[dev] == 0)
            return -ENODEV;

      if (joystick_port[dev] == 1) { /* auto-detect */
            for (io_port = 0x200; io_port <= 0x218; io_port += 8) {
                  r = request_region(io_port, 8, "ALS4000 gameport");
                  if (r)
                        break;
            }
      } else {
            io_port = joystick_port[dev];
            r = request_region(io_port, 8, "ALS4000 gameport");
      }

      if (!r) {
            printk(KERN_WARNING "als4000: cannot reserve joystick ports\n");
            return -EBUSY;
      }

      acard->gameport = gp = gameport_allocate_port();
      if (!gp) {
            printk(KERN_ERR "als4000: cannot allocate memory for gameport\n");
            release_and_free_resource(r);
            return -ENOMEM;
      }

      gameport_set_name(gp, "ALS4000 Gameport");
      gameport_set_phys(gp, "pci%s/gameport0", pci_name(acard->pci));
      gameport_set_dev_parent(gp, &acard->pci->dev);
      gp->io = io_port;
      gameport_set_port_data(gp, r);

      /* Enable legacy joystick port */
      snd_als4000_set_addr(acard->gcr, 0, 0, 0, 1);

      gameport_register_port(acard->gameport);

      return 0;
}

static void snd_als4000_free_gameport(struct snd_card_als4000 *acard)
{
      if (acard->gameport) {
            struct resource *r = gameport_get_port_data(acard->gameport);

            gameport_unregister_port(acard->gameport);
            acard->gameport = NULL;

            snd_als4000_set_addr(acard->gcr, 0, 0, 0, 0); /* disable joystick */
            release_and_free_resource(r);
      }
}
#else
static inline int snd_als4000_create_gameport(struct snd_card_als4000 *acard, int dev) { return -ENOSYS; }
static inline void snd_als4000_free_gameport(struct snd_card_als4000 *acard) { }
#endif

static void snd_card_als4000_free( struct snd_card *card )
{
      struct snd_card_als4000 * acard = (struct snd_card_als4000 *)card->private_data;

      /* make sure that interrupts are disabled */
      snd_als4000_gcr_write_addr( acard->gcr, 0x8c, 0);
      /* free resources */
      snd_als4000_free_gameport(acard);
      pci_release_regions(acard->pci);
      pci_disable_device(acard->pci);
}

static int __devinit snd_card_als4000_probe(struct pci_dev *pci,
                                const struct pci_device_id *pci_id)
{
      static int dev;
      struct snd_card *card;
      struct snd_card_als4000 *acard;
      unsigned long gcr;
      struct snd_sb *chip;
      struct snd_opl3 *opl3;
      unsigned short word;
      int err;

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

      /* 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_24BIT_MASK) < 0 ||
          pci_set_consistent_dma_mask(pci, DMA_24BIT_MASK) < 0) {
            snd_printk(KERN_ERR "architecture does not support 24bit PCI busmaster DMA\n");
            pci_disable_device(pci);
            return -ENXIO;
      }

      if ((err = pci_request_regions(pci, "ALS4000")) < 0) {
            pci_disable_device(pci);
            return err;
      }
      gcr = pci_resource_start(pci, 0);

      pci_read_config_word(pci, PCI_COMMAND, &word);
      pci_write_config_word(pci, PCI_COMMAND, word | PCI_COMMAND_IO);
      pci_set_master(pci);
      
      card = snd_card_new(index[dev], id[dev], THIS_MODULE, 
                      sizeof( struct snd_card_als4000 ) );
      if (card == NULL) {
            pci_release_regions(pci);
            pci_disable_device(pci);
            return -ENOMEM;
      }

      acard = (struct snd_card_als4000 *)card->private_data;
      acard->pci = pci;
      acard->gcr = gcr;
      card->private_free = snd_card_als4000_free;

      /* disable all legacy ISA stuff */
      snd_als4000_set_addr(acard->gcr, 0, 0, 0, 0);

      if ((err = snd_sbdsp_create(card,
                            gcr + 0x10,
                            pci->irq,
                            snd_als4000_interrupt,
                            -1,
                            -1,
                            SB_HW_ALS4000,
                            &chip)) < 0) {
            goto out_err;
      }
      acard->chip = chip;

      chip->pci = pci;
      chip->alt_port = gcr;
      snd_card_set_dev(card, &pci->dev);

      snd_als4000_configure(chip);

      strcpy(card->driver, "ALS4000");
      strcpy(card->shortname, "Avance Logic ALS4000");
      sprintf(card->longname, "%s at 0x%lx, irq %i",
            card->shortname, chip->alt_port, chip->irq);

      if ((err = snd_mpu401_uart_new( card, 0, MPU401_HW_ALS4000,
                                gcr+0x30, MPU401_INFO_INTEGRATED,
                              pci->irq, 0, &chip->rmidi)) < 0) {
            printk(KERN_ERR "als4000: no MPU-401 device at 0x%lx?\n", gcr+0x30);
            goto out_err;
      }

      if ((err = snd_als4000_pcm(chip, 0)) < 0) {
            goto out_err;
      }
      if ((err = snd_sbmixer_new(chip)) < 0) {
            goto out_err;
      }         

      if (snd_opl3_create(card, gcr+0x10, gcr+0x12,
                      OPL3_HW_AUTO, 1, &opl3) < 0) {
            printk(KERN_ERR "als4000: no OPL device at 0x%lx-0x%lx?\n",
                     gcr+0x10, gcr+0x12 );
      } else {
            if ((err = snd_opl3_hwdep_new(opl3, 0, 1, NULL)) < 0) {
                  goto out_err;
            }
      }

      snd_als4000_create_gameport(acard, dev);

      if ((err = snd_card_register(card)) < 0) {
            goto out_err;
      }
      pci_set_drvdata(pci, card);
      dev++;
      err = 0;
      goto out;

out_err:
      snd_card_free(card);
      
out:
      return err;
}

static void __devexit snd_card_als4000_remove(struct pci_dev *pci)
{
      snd_card_free(pci_get_drvdata(pci));
      pci_set_drvdata(pci, NULL);
}

#ifdef CONFIG_PM
static int snd_als4000_suspend(struct pci_dev *pci, pm_message_t state)
{
      struct snd_card *card = pci_get_drvdata(pci);
      struct snd_card_als4000 *acard = card->private_data;
      struct snd_sb *chip = acard->chip;

      snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
      
      snd_pcm_suspend_all(chip->pcm);
      snd_sbmixer_suspend(chip);

      pci_disable_device(pci);
      pci_save_state(pci);
      pci_set_power_state(pci, pci_choose_state(pci, state));
      return 0;
}

static int snd_als4000_resume(struct pci_dev *pci)
{
      struct snd_card *card = pci_get_drvdata(pci);
      struct snd_card_als4000 *acard = card->private_data;
      struct snd_sb *chip = acard->chip;

      pci_set_power_state(pci, PCI_D0);
      pci_restore_state(pci);
      if (pci_enable_device(pci) < 0) {
            printk(KERN_ERR "als4000: pci_enable_device failed, "
                   "disabling device\n");
            snd_card_disconnect(card);
            return -EIO;
      }
      pci_set_master(pci);

      snd_als4000_configure(chip);
      snd_sbdsp_reset(chip);
      snd_sbmixer_resume(chip);

#ifdef SUPPORT_JOYSTICK
      if (acard->gameport)
            snd_als4000_set_addr(acard->gcr, 0, 0, 0, 1);
#endif

      snd_power_change_state(card, SNDRV_CTL_POWER_D0);
      return 0;
}
#endif


static struct pci_driver driver = {
      .name = "ALS4000",
      .id_table = snd_als4000_ids,
      .probe = snd_card_als4000_probe,
      .remove = __devexit_p(snd_card_als4000_remove),
#ifdef CONFIG_PM
      .suspend = snd_als4000_suspend,
      .resume = snd_als4000_resume,
#endif
};

static int __init alsa_card_als4000_init(void)
{
      return pci_register_driver(&driver);
}

static void __exit alsa_card_als4000_exit(void)
{
      pci_unregister_driver(&driver);
}

module_init(alsa_card_als4000_init)
module_exit(alsa_card_als4000_exit)

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