/*
   *  card-als4000.c - driver for Avance Logic ALS4000 based soundcards.
   *  Copyright (C) 2000 by Bart Hartgers <bart@etpmod.phys.tue.nl>,
   *			  Jaroslav Kysela <perex@suse.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 <sound/driver.h>
  #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
  ");
  		return -EBUSY;
  	}
  
  	acard->gameport = gp = gameport_allocate_port();
  	if (!gp) {
  		printk(KERN_ERR "als4000: cannot allocate memory for gameport
  ");

  		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
  ");

  		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?
  ", 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?
  ",

  			   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
  ");
  		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)