/*

   *   Low-level ALSA driver for the ENSONIQ SoundScape

   *   Copyright (c) by Chris Rankin
   *
   *   This driver was written in part using information obtained from
   *   the OSS/Free SoundScape driver, written by Hannu Savolainen.
   *
   *
   *   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
   */

  #include <linux/init.h>

  #include <linux/err.h>

  #include <linux/isa.h>

  #include <linux/delay.h>

  #include <linux/firmware.h>

  #include <linux/pnp.h>
  #include <linux/spinlock.h>

  #include <linux/module.h>

  #include <asm/dma.h>
  #include <sound/core.h>

  #include <sound/wss.h>

  #include <sound/mpu401.h>
  #include <sound/initval.h>

  
  MODULE_AUTHOR("Chris Rankin");

  MODULE_DESCRIPTION("ENSONIQ SoundScape driver");

  MODULE_LICENSE("GPL");

  MODULE_FIRMWARE("sndscape.co0");
  MODULE_FIRMWARE("sndscape.co1");
  MODULE_FIRMWARE("sndscape.co2");
  MODULE_FIRMWARE("sndscape.co3");
  MODULE_FIRMWARE("sndscape.co4");
  MODULE_FIRMWARE("scope.cod");

  static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
  static char* id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
  static long port[SNDRV_CARDS] = SNDRV_DEFAULT_PORT;
  static long wss_port[SNDRV_CARDS] = SNDRV_DEFAULT_PORT;
  static int irq[SNDRV_CARDS] = SNDRV_DEFAULT_IRQ;
  static int mpu_irq[SNDRV_CARDS] = SNDRV_DEFAULT_IRQ;
  static int dma[SNDRV_CARDS] = SNDRV_DEFAULT_DMA;
  static int dma2[SNDRV_CARDS] = SNDRV_DEFAULT_DMA;
  static bool joystick[SNDRV_CARDS];

  
  module_param_array(index, int, NULL, 0444);
  MODULE_PARM_DESC(index, "Index number for SoundScape soundcard");
  
  module_param_array(id, charp, NULL, 0444);
  MODULE_PARM_DESC(id, "Description for SoundScape card");
  
  module_param_array(port, long, NULL, 0444);
  MODULE_PARM_DESC(port, "Port # for SoundScape driver.");

  module_param_array(wss_port, long, NULL, 0444);
  MODULE_PARM_DESC(wss_port, "WSS Port # for SoundScape driver.");

  module_param_array(irq, int, NULL, 0444);
  MODULE_PARM_DESC(irq, "IRQ # for SoundScape driver.");
  
  module_param_array(mpu_irq, int, NULL, 0444);
  MODULE_PARM_DESC(mpu_irq, "MPU401 IRQ # for SoundScape driver.");
  
  module_param_array(dma, int, NULL, 0444);
  MODULE_PARM_DESC(dma, "DMA # for SoundScape driver.");

  module_param_array(dma2, int, NULL, 0444);
  MODULE_PARM_DESC(dma2, "DMA2 # for SoundScape driver.");

  module_param_array(joystick, bool, NULL, 0444);
  MODULE_PARM_DESC(joystick, "Enable gameport.");

  #ifdef CONFIG_PNP

  static int isa_registered;

  static int pnp_registered;

  static struct pnp_card_device_id sscape_pnpids[] = {

  	{ .id = "ENS3081", .devs = { { "ENS0000" } } }, /* Soundscape PnP */
  	{ .id = "ENS4081", .devs = { { "ENS1011" } } },	/* VIVO90 */

  	{ .id = "" }	/* end */
  };
  
  MODULE_DEVICE_TABLE(pnp_card, sscape_pnpids);
  #endif

  #define HOST_CTRL_IO(i)  ((i) + 2)
  #define HOST_DATA_IO(i)  ((i) + 3)
  #define ODIE_ADDR_IO(i)  ((i) + 4)
  #define ODIE_DATA_IO(i)  ((i) + 5)
  #define CODEC_IO(i)      ((i) + 8)
  
  #define IC_ODIE  1
  #define IC_OPUS  2
  
  #define RX_READY 0x01
  #define TX_READY 0x02

  #define CMD_ACK			0x80
  #define CMD_SET_MIDI_VOL	0x84
  #define CMD_GET_MIDI_VOL	0x85
  #define CMD_XXX_MIDI_VOL	0x86
  #define CMD_SET_EXTMIDI		0x8a
  #define CMD_GET_EXTMIDI		0x8b
  #define CMD_SET_MT32		0x8c
  #define CMD_GET_MT32		0x8d

  
  enum GA_REG {
  	GA_INTSTAT_REG = 0,
  	GA_INTENA_REG,
  	GA_DMAA_REG,
  	GA_DMAB_REG,
  	GA_INTCFG_REG,
  	GA_DMACFG_REG,
  	GA_CDCFG_REG,
  	GA_SMCFGA_REG,
  	GA_SMCFGB_REG,
  	GA_HMCTL_REG
  };
  
  #define DMA_8BIT  0x80

  enum card_type {

  	MEDIA_FX,	/* Sequoia S-1000 */
  	SSCAPE,		/* Sequoia S-2000 */

  	SSCAPE_PNP,
  	SSCAPE_VIVO,
  };

  struct soundscape {
  	spinlock_t lock;
  	unsigned io_base;

  	int ic_type;

  	enum card_type type;

  	struct resource *io_res;

  	struct resource *wss_res;

  	struct snd_wss *chip;

  	unsigned char midi_vol;
  };
  
  #define INVALID_IRQ  ((unsigned)-1)

  static inline struct soundscape *get_card_soundscape(struct snd_card *c)

  {
  	return (struct soundscape *) (c->private_data);
  }

  /*
   * Allocates some kernel memory that we can use for DMA.
   * I think this means that the memory has to map to
   * contiguous pages of physical memory.
   */

  static struct snd_dma_buffer *get_dmabuf(struct snd_dma_buffer *buf,
  					 unsigned long size)

  {
  	if (buf) {

  		if (snd_dma_alloc_pages_fallback(SNDRV_DMA_TYPE_DEV,
  						 snd_dma_isa_data(),

  						 size, buf) < 0) {

  			snd_printk(KERN_ERR "sscape: Failed to allocate "
  					    "%lu bytes for DMA
  ",
  					    size);

  			return NULL;
  		}
  	}
  
  	return buf;
  }
  
  /*
   * Release the DMA-able kernel memory ...
   */
  static void free_dmabuf(struct snd_dma_buffer *buf)
  {
  	if (buf && buf->area)
  		snd_dma_free_pages(buf);
  }

  /*
   * This function writes to the SoundScape's control registers,
   * but doesn't do any locking. It's up to the caller to do that.
   * This is why this function is "unsafe" ...
   */

  static inline void sscape_write_unsafe(unsigned io_base, enum GA_REG reg,
  				       unsigned char val)

  {
  	outb(reg, ODIE_ADDR_IO(io_base));
  	outb(val, ODIE_DATA_IO(io_base));
  }
  
  /*
   * Write to the SoundScape's control registers, and do the
   * necessary locking ...
   */

  static void sscape_write(struct soundscape *s, enum GA_REG reg,
  			 unsigned char val)

  {
  	unsigned long flags;
  
  	spin_lock_irqsave(&s->lock, flags);
  	sscape_write_unsafe(s->io_base, reg, val);
  	spin_unlock_irqrestore(&s->lock, flags);
  }
  
  /*
   * Read from the SoundScape's control registers, but leave any
   * locking to the caller. This is why the function is "unsafe" ...
   */

  static inline unsigned char sscape_read_unsafe(unsigned io_base,
  					       enum GA_REG reg)

  {
  	outb(reg, ODIE_ADDR_IO(io_base));
  	return inb(ODIE_DATA_IO(io_base));
  }
  
  /*
   * Puts the SoundScape into "host" mode, as compared to "MIDI" mode
   */
  static inline void set_host_mode_unsafe(unsigned io_base)
  {
  	outb(0x0, HOST_CTRL_IO(io_base));
  }
  
  /*
   * Puts the SoundScape into "MIDI" mode, as compared to "host" mode
   */
  static inline void set_midi_mode_unsafe(unsigned io_base)
  {
  	outb(0x3, HOST_CTRL_IO(io_base));
  }
  
  /*
   * Read the SoundScape's host-mode control register, but leave
   * any locking issues to the caller ...
   */
  static inline int host_read_unsafe(unsigned io_base)
  {
  	int data = -1;

  	if ((inb(HOST_CTRL_IO(io_base)) & RX_READY) != 0)

  		data = inb(HOST_DATA_IO(io_base));

  
  	return data;
  }
  
  /*
   * Read the SoundScape's host-mode control register, performing
   * a limited amount of busy-waiting if the register isn't ready.
   * Also leaves all locking-issues to the caller ...
   */
  static int host_read_ctrl_unsafe(unsigned io_base, unsigned timeout)
  {
  	int data;
  
  	while (((data = host_read_unsafe(io_base)) < 0) && (timeout != 0)) {
  		udelay(100);
  		--timeout;
  	} /* while */
  
  	return data;
  }
  
  /*
   * Write to the SoundScape's host-mode control registers, but
   * leave any locking issues to the caller ...
   */
  static inline int host_write_unsafe(unsigned io_base, unsigned char data)
  {
  	if ((inb(HOST_CTRL_IO(io_base)) & TX_READY) != 0) {
  		outb(data, HOST_DATA_IO(io_base));
  		return 1;
  	}
  
  	return 0;
  }
  
  /*
   * Write to the SoundScape's host-mode control registers, performing
   * a limited amount of busy-waiting if the register isn't ready.
   * Also leaves all locking-issues to the caller ...
   */
  static int host_write_ctrl_unsafe(unsigned io_base, unsigned char data,

  				  unsigned timeout)

  {
  	int err;
  
  	while (!(err = host_write_unsafe(io_base, data)) && (timeout != 0)) {
  		udelay(100);
  		--timeout;
  	} /* while */
  
  	return err;
  }
  
  
  /*
   * Check that the MIDI subsystem is operational. If it isn't,
   * then we will hang the computer if we try to use it ...
   *
   * NOTE: This check is based upon observation, not documentation.
   */

  static inline int verify_mpu401(const struct snd_mpu401 *mpu)

  {

  	return ((inb(MPU401C(mpu)) & 0xc0) == 0x80);

  }
  
  /*
   * This is apparently the standard way to initailise an MPU-401
   */

  static inline void initialise_mpu401(const struct snd_mpu401 *mpu)

  {

  	outb(0, MPU401D(mpu));

  }
  
  /*
   * Tell the SoundScape to activate the AD1845 chip (I think).
   * The AD1845 detection fails if we *don't* do this, so I
   * think that this is a good idea ...
   */

  static void activate_ad1845_unsafe(unsigned io_base)

  {

  	unsigned char val = sscape_read_unsafe(io_base, GA_HMCTL_REG);
  	sscape_write_unsafe(io_base, GA_HMCTL_REG, (val & 0xcf) | 0x10);

  	sscape_write_unsafe(io_base, GA_CDCFG_REG, 0x80);
  }
  
  /*
   * Do the necessary ALSA-level cleanup to deallocate our driver ...
   */

  static void soundscape_free(struct snd_card *c)

  {

  	struct soundscape *sscape = get_card_soundscape(c);

  	release_and_free_resource(sscape->io_res);

  	release_and_free_resource(sscape->wss_res);

  	free_dma(sscape->chip->dma1);
  }
  
  /*

   * Tell the SoundScape to begin a DMA tranfer using the given channel.
   * All locking issues are left to the caller.
   */

  static void sscape_start_dma_unsafe(unsigned io_base, enum GA_REG reg)

  {

  	sscape_write_unsafe(io_base, reg,
  			    sscape_read_unsafe(io_base, reg) | 0x01);
  	sscape_write_unsafe(io_base, reg,
  			    sscape_read_unsafe(io_base, reg) & 0xfe);

  }
  
  /*
   * Wait for a DMA transfer to complete. This is a "limited busy-wait",
   * and all locking issues are left to the caller.
   */

  static int sscape_wait_dma_unsafe(unsigned io_base, enum GA_REG reg,
  				  unsigned timeout)

  {
  	while (!(sscape_read_unsafe(io_base, reg) & 0x01) && (timeout != 0)) {
  		udelay(100);
  		--timeout;
  	} /* while */

  	return sscape_read_unsafe(io_base, reg) & 0x01;

  }
  
  /*
   * Wait for the On-Board Processor to return its start-up
   * acknowledgement sequence. This wait is too long for
   * us to perform "busy-waiting", and so we must sleep.
   * This in turn means that we must not be holding any
   * spinlocks when we call this function.
   */
  static int obp_startup_ack(struct soundscape *s, unsigned timeout)
  {

  	unsigned long end_time = jiffies + msecs_to_jiffies(timeout);
  
  	do {

  		unsigned long flags;

  		int x;

  		spin_lock_irqsave(&s->lock, flags);

  		x = host_read_unsafe(s->io_base);

  		spin_unlock_irqrestore(&s->lock, flags);

  		if (x == 0xfe || x == 0xff)

  			return 1;

  		msleep(10);
  	} while (time_before(jiffies, end_time));

  
  	return 0;
  }
  
  /*
   * Wait for the host to return its start-up acknowledgement
   * sequence. This wait is too long for us to perform
   * "busy-waiting", and so we must sleep. This in turn means
   * that we must not be holding any spinlocks when we call
   * this function.
   */
  static int host_startup_ack(struct soundscape *s, unsigned timeout)
  {

  	unsigned long end_time = jiffies + msecs_to_jiffies(timeout);
  
  	do {

  		unsigned long flags;

  		int x;

  		spin_lock_irqsave(&s->lock, flags);

  		x = host_read_unsafe(s->io_base);

  		spin_unlock_irqrestore(&s->lock, flags);
  		if (x == 0xfe)
  			return 1;

  		msleep(10);
  	} while (time_before(jiffies, end_time));

  
  	return 0;
  }
  
  /*
   * Upload a byte-stream into the SoundScape using DMA channel A.
   */

  static int upload_dma_data(struct soundscape *s, const unsigned char *data,
  			   size_t size)

  {
  	unsigned long flags;
  	struct snd_dma_buffer dma;
  	int ret;

  	unsigned char val;

  	if (!get_dmabuf(&dma, PAGE_ALIGN(32 * 1024)))

  		return -ENOMEM;
  
  	spin_lock_irqsave(&s->lock, flags);
  
  	/*
  	 * Reset the board ...
  	 */

  	val = sscape_read_unsafe(s->io_base, GA_HMCTL_REG);
  	sscape_write_unsafe(s->io_base, GA_HMCTL_REG, val & 0x3f);

  
  	/*
  	 * Enable the DMA channels and configure them ...
  	 */

  	val = (s->chip->dma1 << 4) | DMA_8BIT;
  	sscape_write_unsafe(s->io_base, GA_DMAA_REG, val);

  	sscape_write_unsafe(s->io_base, GA_DMAB_REG, 0x20);
  
  	/*
  	 * Take the board out of reset ...
  	 */

  	val = sscape_read_unsafe(s->io_base, GA_HMCTL_REG);
  	sscape_write_unsafe(s->io_base, GA_HMCTL_REG, val | 0x80);

  
  	/*

  	 * Upload the firmware to the SoundScape

  	 * board through the DMA channel ...
  	 */
  	while (size != 0) {
  		unsigned long len;

  		len = min(size, dma.bytes);

  		memcpy(dma.area, data, len);

  		data += len;
  		size -= len;

  		snd_dma_program(s->chip->dma1, dma.addr, len, DMA_MODE_WRITE);
  		sscape_start_dma_unsafe(s->io_base, GA_DMAA_REG);
  		if (!sscape_wait_dma_unsafe(s->io_base, GA_DMAA_REG, 5000)) {
  			/*

  			 * Don't forget to release this spinlock we're holding

  			 */
  			spin_unlock_irqrestore(&s->lock, flags);

  			snd_printk(KERN_ERR
  					"sscape: DMA upload has timed out
  ");

  			ret = -EAGAIN;
  			goto _release_dma;
  		}
  	} /* while */
  
  	set_host_mode_unsafe(s->io_base);

  	outb(0x0, s->io_base);

  
  	/*
  	 * Boot the board ... (I think)
  	 */

  	val = sscape_read_unsafe(s->io_base, GA_HMCTL_REG);
  	sscape_write_unsafe(s->io_base, GA_HMCTL_REG, val | 0x40);

  	spin_unlock_irqrestore(&s->lock, flags);
  
  	/*
  	 * If all has gone well, then the board should acknowledge
  	 * the new upload and tell us that it has rebooted OK. We
  	 * give it 5 seconds (max) ...
  	 */
  	ret = 0;

  	if (!obp_startup_ack(s, 5000)) {

  		snd_printk(KERN_ERR "sscape: No response "
  				    "from on-board processor after upload
  ");

  		ret = -EAGAIN;

  	} else if (!host_startup_ack(s, 5000)) {

  		snd_printk(KERN_ERR
  				"sscape: SoundScape failed to initialise
  ");

  		ret = -EAGAIN;
  	}

  _release_dma:

  	/*
  	 * NOTE!!! We are NOT holding any spinlocks at this point !!!
  	 */

  	sscape_write(s, GA_DMAA_REG, (s->ic_type == IC_OPUS ? 0x40 : 0x70));

  	free_dmabuf(&dma);
  
  	return ret;
  }
  
  /*
   * Upload the bootblock(?) into the SoundScape. The only
   * purpose of this block of code seems to be to tell
   * us which version of the microcode we should be using.

   */

  static int sscape_upload_bootblock(struct snd_card *card)

  {

  	struct soundscape *sscape = get_card_soundscape(card);

  	unsigned long flags;

  	const struct firmware *init_fw = NULL;

  	int data = 0;
  	int ret;

  	ret = request_firmware(&init_fw, "scope.cod", card->dev);
  	if (ret < 0) {

  		snd_printk(KERN_ERR "sscape: Error loading scope.cod");

  		return ret;

  	}

  	ret = upload_dma_data(sscape, init_fw->data, init_fw->size);

  	release_firmware(init_fw);

  	spin_lock_irqsave(&sscape->lock, flags);
  	if (ret == 0)
  		data = host_read_ctrl_unsafe(sscape->io_base, 100);

  	if (data & 0x10)
  		sscape_write_unsafe(sscape->io_base, GA_SMCFGA_REG, 0x2f);

  	spin_unlock_irqrestore(&sscape->lock, flags);

  	data &= 0xf;
  	if (ret == 0 && data > 7) {

  		snd_printk(KERN_ERR
  				"sscape: timeout reading firmware version
  ");

  		ret = -EAGAIN;
  	}

  	return (ret == 0) ? data : ret;

  }
  
  /*

   * Upload the microcode into the SoundScape.

   */

  static int sscape_upload_microcode(struct snd_card *card, int version)

  {

  	struct soundscape *sscape = get_card_soundscape(card);
  	const struct firmware *init_fw = NULL;
  	char name[14];

  	int err;

  	snprintf(name, sizeof(name), "sndscape.co%d", version);

  	err = request_firmware(&init_fw, name, card->dev);
  	if (err < 0) {

  		snd_printk(KERN_ERR "sscape: Error loading sndscape.co%d",
  				version);

  		return err;

  	}

  	err = upload_dma_data(sscape, init_fw->data, init_fw->size);
  	if (err == 0)

  		snd_printk(KERN_INFO "sscape: MIDI firmware loaded %d KBs
  ",

  				init_fw->size >> 10);

  	release_firmware(init_fw);

  
  	return err;
  }

  /*
   * Mixer control for the SoundScape's MIDI device.
   */

  static int sscape_midi_info(struct snd_kcontrol *ctl,

  			    struct snd_ctl_elem_info *uinfo)

  {
  	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
  	uinfo->count = 1;
  	uinfo->value.integer.min = 0;
  	uinfo->value.integer.max = 127;
  	return 0;
  }

  static int sscape_midi_get(struct snd_kcontrol *kctl,

  			   struct snd_ctl_elem_value *uctl)

  {

  	struct snd_wss *chip = snd_kcontrol_chip(kctl);

  	struct snd_card *card = chip->card;

  	register struct soundscape *s = get_card_soundscape(card);
  	unsigned long flags;
  
  	spin_lock_irqsave(&s->lock, flags);

  	uctl->value.integer.value[0] = s->midi_vol;

  	spin_unlock_irqrestore(&s->lock, flags);
  	return 0;
  }

  static int sscape_midi_put(struct snd_kcontrol *kctl,

  			   struct snd_ctl_elem_value *uctl)

  {

  	struct snd_wss *chip = snd_kcontrol_chip(kctl);

  	struct snd_card *card = chip->card;

  	struct soundscape *s = get_card_soundscape(card);

  	unsigned long flags;
  	int change;

  	unsigned char new_val;

  
  	spin_lock_irqsave(&s->lock, flags);

  	new_val = uctl->value.integer.value[0] & 127;

  	/*
  	 * We need to put the board into HOST mode before we
  	 * can send any volume-changing HOST commands ...
  	 */
  	set_host_mode_unsafe(s->io_base);
  
  	/*
  	 * To successfully change the MIDI volume setting, you seem to
  	 * have to write a volume command, write the new volume value,
  	 * and then perform another volume-related command. Perhaps the
  	 * first command is an "open" and the second command is a "close"?
  	 */

  	if (s->midi_vol == new_val) {

  		change = 0;
  		goto __skip_change;
  	}

  	change = host_write_ctrl_unsafe(s->io_base, CMD_SET_MIDI_VOL, 100)
  		 && host_write_ctrl_unsafe(s->io_base, new_val, 100)
  		 && host_write_ctrl_unsafe(s->io_base, CMD_XXX_MIDI_VOL, 100)
  		 && host_write_ctrl_unsafe(s->io_base, new_val, 100);
  	s->midi_vol = new_val;
  __skip_change:

  
  	/*
  	 * Take the board out of HOST mode and back into MIDI mode ...
  	 */
  	set_midi_mode_unsafe(s->io_base);
  
  	spin_unlock_irqrestore(&s->lock, flags);
  	return change;
  }

  static struct snd_kcontrol_new midi_mixer_ctl = {

  	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
  	.name = "MIDI",
  	.info = sscape_midi_info,
  	.get = sscape_midi_get,
  	.put = sscape_midi_put
  };
  
  /*
   * The SoundScape can use two IRQs from a possible set of four.
   * These IRQs are encoded as bit patterns so that they can be
   * written to the control registers.
   */

  static unsigned __devinit get_irq_config(int sscape_type, int irq)

  {
  	static const int valid_irq[] = { 9, 5, 7, 10 };

  	static const int old_irq[] = { 9, 7, 5, 15 };

  	unsigned cfg;

  	if (sscape_type == MEDIA_FX) {
  		for (cfg = 0; cfg < ARRAY_SIZE(old_irq); ++cfg)
  			if (irq == old_irq[cfg])
  				return cfg;
  	} else {
  		for (cfg = 0; cfg < ARRAY_SIZE(valid_irq); ++cfg)
  			if (irq == valid_irq[cfg])
  				return cfg;
  	}

  
  	return INVALID_IRQ;
  }

  /*
   * Perform certain arcane port-checks to see whether there
   * is a SoundScape board lurking behind the given ports.
   */

  static int __devinit detect_sscape(struct soundscape *s, long wss_io)

  {
  	unsigned long flags;
  	unsigned d;
  	int retval = 0;
  
  	spin_lock_irqsave(&s->lock, flags);
  
  	/*
  	 * The following code is lifted from the original OSS driver,
  	 * and as I don't have a datasheet I cannot really comment
  	 * on what it is doing...
  	 */
  	if ((inb(HOST_CTRL_IO(s->io_base)) & 0x78) != 0)
  		goto _done;
  
  	d = inb(ODIE_ADDR_IO(s->io_base)) & 0xf0;
  	if ((d & 0x80) != 0)
  		goto _done;

  	if (d == 0)

  		s->ic_type = IC_ODIE;

  	else if ((d & 0x60) != 0)

  		s->ic_type = IC_OPUS;

  	else

  		goto _done;
  
  	outb(0xfa, ODIE_ADDR_IO(s->io_base));
  	if ((inb(ODIE_ADDR_IO(s->io_base)) & 0x9f) != 0x0a)
  		goto _done;
  
  	outb(0xfe, ODIE_ADDR_IO(s->io_base));
  	if ((inb(ODIE_ADDR_IO(s->io_base)) & 0x9f) != 0x0e)
  		goto _done;

  
  	outb(0xfe, ODIE_ADDR_IO(s->io_base));
  	d = inb(ODIE_DATA_IO(s->io_base));
  	if (s->type != SSCAPE_VIVO && (d & 0x9f) != 0x0e)

  		goto _done;

  	if (s->ic_type == IC_OPUS)
  		activate_ad1845_unsafe(s->io_base);

  
  	if (s->type == SSCAPE_VIVO)

  		wss_io += 4;

  	d  = sscape_read_unsafe(s->io_base, GA_HMCTL_REG);

  	sscape_write_unsafe(s->io_base, GA_HMCTL_REG, d | 0xc0);
  
  	/* wait for WSS codec */
  	for (d = 0; d < 500; d++) {
  		if ((inb(wss_io) & 0x80) == 0)
  			break;
  		spin_unlock_irqrestore(&s->lock, flags);
  		msleep(1);
  		spin_lock_irqsave(&s->lock, flags);
  	}

  
  	if ((inb(wss_io) & 0x80) != 0)
  		goto _done;
  
  	if (inb(wss_io + 2) == 0xff)
  		goto _done;
  
  	d  = sscape_read_unsafe(s->io_base, GA_HMCTL_REG) & 0x3f;
  	sscape_write_unsafe(s->io_base, GA_HMCTL_REG, d);
  
  	if ((inb(wss_io) & 0x80) != 0)
  		s->type = MEDIA_FX;

  	d = sscape_read_unsafe(s->io_base, GA_HMCTL_REG);

  	sscape_write_unsafe(s->io_base, GA_HMCTL_REG, d | 0xc0);

  	/* wait for WSS codec */
  	for (d = 0; d < 500; d++) {

  		if ((inb(wss_io) & 0x80) == 0)

  			break;
  		spin_unlock_irqrestore(&s->lock, flags);
  		msleep(1);
  		spin_lock_irqsave(&s->lock, flags);
  	}

  	/*
  	 * SoundScape successfully detected!
  	 */
  	retval = 1;

  _done:

  	spin_unlock_irqrestore(&s->lock, flags);
  	return retval;
  }
  
  /*
   * ALSA callback function, called when attempting to open the MIDI device.
   * Check that the MIDI firmware has been loaded, because we don't want
   * to crash the machine. Also check that someone isn't using the hardware
   * IOCTL device.
   */

  static int mpu401_open(struct snd_mpu401 *mpu)

  {

  	if (!verify_mpu401(mpu)) {

  		snd_printk(KERN_ERR "sscape: MIDI disabled, "
  				    "please load firmware
  ");
  		return -ENODEV;

  	}

  	return 0;

  }
  
  /*
   * Initialse an MPU-401 subdevice for MIDI support on the SoundScape.
   */

  static int __devinit create_mpu401(struct snd_card *card, int devnum,
  				   unsigned long port, int irq)

  {
  	struct soundscape *sscape = get_card_soundscape(card);

  	struct snd_rawmidi *rawmidi;

  	int err;

  	err = snd_mpu401_uart_new(card, devnum, MPU401_HW_MPU401, port,

  				  MPU401_INFO_INTEGRATED, irq, &rawmidi);

  	if (err == 0) {
  		struct snd_mpu401 *mpu = rawmidi->private_data;

  		mpu->open_input = mpu401_open;
  		mpu->open_output = mpu401_open;

  		mpu->private_data = sscape;

  
  		initialise_mpu401(mpu);
  	}
  
  	return err;
  }
  
  
  /*

   * Create an AD1845 PCM subdevice on the SoundScape. The AD1845
   * is very much like a CS4231, with a few extra bits. We will
   * try to support at least some of the extra bits by overriding
   * some of the CS4231 callback.
   */

  static int __devinit create_ad1845(struct snd_card *card, unsigned port,
  				   int irq, int dma1, int dma2)

  {
  	register struct soundscape *sscape = get_card_soundscape(card);

  	struct snd_wss *chip;

  	int err;

  	int codec_type = WSS_HW_DETECT;
  
  	switch (sscape->type) {
  	case MEDIA_FX:
  	case SSCAPE:
  		/*
  		 * There are some freak examples of early Soundscape cards
  		 * with CS4231 instead of AD1848/CS4248. Unfortunately, the
  		 * CS4231 works only in CS4248 compatibility mode on
  		 * these cards so force it.
  		 */
  		if (sscape->ic_type != IC_OPUS)
  			codec_type = WSS_HW_AD1848;
  		break;

  	case SSCAPE_VIVO:

  		port += 4;

  		break;
  	default:
  		break;
  	}

  	err = snd_wss_create(card, port, -1, irq, dma1, dma2,

  			     codec_type, WSS_HWSHARE_DMA1, &chip);

  	if (!err) {

  		unsigned long flags;

  		struct snd_pcm *pcm;

  		if (sscape->type != SSCAPE_VIVO) {

  			/*
  			 * The input clock frequency on the SoundScape must
  			 * be 14.31818 MHz, because we must set this register
  			 * to get the playback to sound correct ...
  			 */

  			snd_wss_mce_up(chip);

  			spin_lock_irqsave(&chip->reg_lock, flags);

  			snd_wss_out(chip, AD1845_CLOCK, 0x20);

  			spin_unlock_irqrestore(&chip->reg_lock, flags);

  			snd_wss_mce_down(chip);

  		}

  		err = snd_wss_pcm(chip, 0, &pcm);

  		if (err < 0) {
  			snd_printk(KERN_ERR "sscape: No PCM device "
  					    "for AD1845 chip
  ");

  			goto _error;
  		}

  		err = snd_wss_mixer(chip);

  		if (err < 0) {
  			snd_printk(KERN_ERR "sscape: No mixer device "
  					    "for AD1845 chip
  ");

  			goto _error;
  		}

  		if (chip->hardware != WSS_HW_AD1848) {
  			err = snd_wss_timer(chip, 0, NULL);
  			if (err < 0) {
  				snd_printk(KERN_ERR "sscape: No timer device "
  						    "for AD1845 chip
  ");
  				goto _error;
  			}

  		}

  		if (sscape->type != SSCAPE_VIVO) {
  			err = snd_ctl_add(card,
  					  snd_ctl_new1(&midi_mixer_ctl, chip));
  			if (err < 0) {
  				snd_printk(KERN_ERR "sscape: Could not create "
  						    "MIDI mixer control
  ");
  				goto _error;
  			}

  		}

  		sscape->chip = chip;
  	}

  _error:

  	return err;
  }

  /*
   * Create an ALSA soundcard entry for the SoundScape, using
   * the given list of port, IRQ and DMA resources.
   */

  static int __devinit create_sscape(int dev, struct snd_card *card)

  {

  	struct soundscape *sscape = get_card_soundscape(card);
  	unsigned dma_cfg;

  	unsigned irq_cfg;
  	unsigned mpu_irq_cfg;
  	struct resource *io_res;

  	struct resource *wss_res;

  	unsigned long flags;
  	int err;

  	int val;

  	const char *name;

  
  	/*
  	 * Grab IO ports that we will need to probe so that we
  	 * can detect and control this hardware ...
  	 */

  	io_res = request_region(port[dev], 8, "SoundScape");

  	if (!io_res) {

  		snd_printk(KERN_ERR
  			   "sscape: can't grab port 0x%lx
  ", port[dev]);

  		return -EBUSY;
  	}

  	wss_res = NULL;
  	if (sscape->type == SSCAPE_VIVO) {
  		wss_res = request_region(wss_port[dev], 4, "SoundScape");
  		if (!wss_res) {
  			snd_printk(KERN_ERR "sscape: can't grab port 0x%lx
  ",
  					    wss_port[dev]);
  			err = -EBUSY;
  			goto _release_region;
  		}
  	}

  
  	/*

  	 * Grab one DMA channel ...

  	 */

  	err = request_dma(dma[dev], "SoundScape");
  	if (err < 0) {

  		snd_printk(KERN_ERR "sscape: can't grab DMA %d
  ", dma[dev]);

  		goto _release_region;
  	}

  	spin_lock_init(&sscape->lock);

  	sscape->io_res = io_res;

  	sscape->wss_res = wss_res;

  	sscape->io_base = port[dev];

  	if (!detect_sscape(sscape, wss_port[dev])) {

  		printk(KERN_ERR "sscape: hardware not detected at 0x%x
  ",
  			sscape->io_base);

  		err = -ENODEV;

  		goto _release_dma;

  	}

  	switch (sscape->type) {
  	case MEDIA_FX:
  		name = "MediaFX/SoundFX";
  		break;
  	case SSCAPE:
  		name = "Soundscape";
  		break;
  	case SSCAPE_PNP:
  		name = "Soundscape PnP";
  		break;
  	case SSCAPE_VIVO:
  		name = "Soundscape VIVO";
  		break;
  	default:
  		name = "unknown Soundscape";
  		break;
  	}
  
  	printk(KERN_INFO "sscape: %s card detected at 0x%x, using IRQ %d, DMA %d
  ",
  			 name, sscape->io_base, irq[dev], dma[dev]);
  
  	/*
  	 * Check that the user didn't pass us garbage data ...
  	 */
  	irq_cfg = get_irq_config(sscape->type, irq[dev]);
  	if (irq_cfg == INVALID_IRQ) {
  		snd_printk(KERN_ERR "sscape: Invalid IRQ %d
  ", irq[dev]);
  		return -ENXIO;
  	}
  
  	mpu_irq_cfg = get_irq_config(sscape->type, mpu_irq[dev]);
  	if (mpu_irq_cfg == INVALID_IRQ) {

  		snd_printk(KERN_ERR "sscape: Invalid IRQ %d
  ", mpu_irq[dev]);

  		return -ENXIO;
  	}

  	/*
  	 * Tell the on-board devices where their resources are (I think -
  	 * I can't be sure without a datasheet ... So many magic values!)
  	 */
  	spin_lock_irqsave(&sscape->lock, flags);

  	sscape_write_unsafe(sscape->io_base, GA_SMCFGA_REG, 0x2e);
  	sscape_write_unsafe(sscape->io_base, GA_SMCFGB_REG, 0x00);
  
  	/*
  	 * Enable and configure the DMA channels ...
  	 */
  	sscape_write_unsafe(sscape->io_base, GA_DMACFG_REG, 0x50);

  	dma_cfg = (sscape->ic_type == IC_OPUS ? 0x40 : 0x70);

  	sscape_write_unsafe(sscape->io_base, GA_DMAA_REG, dma_cfg);
  	sscape_write_unsafe(sscape->io_base, GA_DMAB_REG, 0x20);

  	mpu_irq_cfg |= mpu_irq_cfg << 2;

  	val = sscape_read_unsafe(sscape->io_base, GA_HMCTL_REG) & 0xF7;
  	if (joystick[dev])
  		val |= 8;
  	sscape_write_unsafe(sscape->io_base, GA_HMCTL_REG, val | 0x10);

  	sscape_write_unsafe(sscape->io_base, GA_INTCFG_REG, 0xf0 | mpu_irq_cfg);

  	sscape_write_unsafe(sscape->io_base,

  			    GA_CDCFG_REG, 0x09 | DMA_8BIT
  			    | (dma[dev] << 4) | (irq_cfg << 1));

  	/*
  	 * Enable the master IRQ ...
  	 */
  	sscape_write_unsafe(sscape->io_base, GA_INTENA_REG, 0x80);

  
  	spin_unlock_irqrestore(&sscape->lock, flags);
  
  	/*
  	 * We have now enabled the codec chip, and so we should
  	 * detect the AD1845 device ...
  	 */

  	err = create_ad1845(card, wss_port[dev], irq[dev],
  			    dma[dev], dma2[dev]);
  	if (err < 0) {

  		snd_printk(KERN_ERR
  				"sscape: No AD1845 device at 0x%lx, IRQ %d
  ",
  				wss_port[dev], irq[dev]);

  		goto _release_dma;

  	}

  	strcpy(card->driver, "SoundScape");
  	strcpy(card->shortname, name);
  	snprintf(card->longname, sizeof(card->longname),
  		 "%s at 0x%lx, IRQ %d, DMA1 %d, DMA2 %d
  ",
  		 name, sscape->chip->port, sscape->chip->irq,
  		 sscape->chip->dma1, sscape->chip->dma2);

  #define MIDI_DEVNUM  0

  	if (sscape->type != SSCAPE_VIVO) {

  		err = sscape_upload_bootblock(card);
  		if (err >= 0)
  			err = sscape_upload_microcode(card, err);

  		if (err == 0) {
  			err = create_mpu401(card, MIDI_DEVNUM, port[dev],
  					    mpu_irq[dev]);
  			if (err < 0) {

  				snd_printk(KERN_ERR "sscape: Failed to create "

  						"MPU-401 device at 0x%lx
  ",
  						port[dev]);
  				goto _release_dma;
  			}
  
  			/*

  			 * Initialize mixer
  			 */
  			spin_lock_irqsave(&sscape->lock, flags);
  			sscape->midi_vol = 0;
  			host_write_ctrl_unsafe(sscape->io_base,
  						CMD_SET_MIDI_VOL, 100);
  			host_write_ctrl_unsafe(sscape->io_base,
  						sscape->midi_vol, 100);
  			host_write_ctrl_unsafe(sscape->io_base,
  						CMD_XXX_MIDI_VOL, 100);
  			host_write_ctrl_unsafe(sscape->io_base,
  						sscape->midi_vol, 100);
  			host_write_ctrl_unsafe(sscape->io_base,
  						CMD_SET_EXTMIDI, 100);
  			host_write_ctrl_unsafe(sscape->io_base,
  						0, 100);
  			host_write_ctrl_unsafe(sscape->io_base, CMD_ACK, 100);
  
  			set_midi_mode_unsafe(sscape->io_base);
  			spin_unlock_irqrestore(&sscape->lock, flags);
  		}

  	}

  
  	/*
  	 * Now that we have successfully created this sound card,
  	 * it is safe to store the pointer.
  	 * NOTE: we only register the sound card's "destructor"
  	 *       function now that our "constructor" has completed.
  	 */
  	card->private_free = soundscape_free;

  
  	return 0;

  _release_dma:

  	free_dma(dma[dev]);

  _release_region:

  	release_and_free_resource(wss_res);

  	release_and_free_resource(io_res);

  
  	return err;
  }

  static int __devinit snd_sscape_match(struct device *pdev, unsigned int i)
  {
  	/*
  	 * Make sure we were given ALL of the other parameters.
  	 */
  	if (port[i] == SNDRV_AUTO_PORT)
  		return 0;
  
  	if (irq[i] == SNDRV_AUTO_IRQ ||
  	    mpu_irq[i] == SNDRV_AUTO_IRQ ||
  	    dma[i] == SNDRV_AUTO_DMA) {
  		printk(KERN_INFO

  		       "sscape: insufficient parameters, "
  		       "need IO, IRQ, MPU-IRQ and DMA
  ");

  		return 0;
  	}
  
  	return 1;
  }
  
  static int __devinit snd_sscape_probe(struct device *pdev, unsigned int dev)

  {

  	struct snd_card *card;

  	struct soundscape *sscape;

  	int ret;

  	ret = snd_card_create(index[dev], id[dev], THIS_MODULE,
  			      sizeof(struct soundscape), &card);
  	if (ret < 0)
  		return ret;

  
  	sscape = get_card_soundscape(card);
  	sscape->type = SSCAPE;

  	dma[dev] &= 0x03;

  	snd_card_set_dev(card, pdev);

  	ret = create_sscape(dev, card);

  	if (ret < 0)

  		goto _release_card;

  	ret = snd_card_register(card);
  	if (ret < 0) {

  		snd_printk(KERN_ERR "sscape: Failed to register sound card
  ");

  		goto _release_card;

  	}

  	dev_set_drvdata(pdev, card);

  	return 0;

  
  _release_card:
  	snd_card_free(card);
  	return ret;

  }

  static int __devexit snd_sscape_remove(struct device *devptr, unsigned int dev)

  {

  	snd_card_free(dev_get_drvdata(devptr));
  	dev_set_drvdata(devptr, NULL);

  	return 0;
  }

  #define DEV_NAME "sscape"

  static struct isa_driver snd_sscape_driver = {
  	.match		= snd_sscape_match,

  	.probe		= snd_sscape_probe,
  	.remove		= __devexit_p(snd_sscape_remove),
  	/* FIXME: suspend/resume */
  	.driver		= {

  		.name	= DEV_NAME

  	},
  };

  
  #ifdef CONFIG_PNP
  static inline int __devinit get_next_autoindex(int i)
  {

  	while (i < SNDRV_CARDS && port[i] != SNDRV_AUTO_PORT)

  		++i;

  	return i;
  }

  static int __devinit sscape_pnp_detect(struct pnp_card_link *pcard,
  				       const struct pnp_card_device_id *pid)
  {

  	static int idx = 0;

  	struct pnp_dev *dev;
  	struct snd_card *card;

  	struct soundscape *sscape;

  	int ret;
  
  	/*
  	 * Allow this function to fail *quietly* if all the ISA PnP
  	 * devices were configured using module parameters instead.
  	 */

  	idx = get_next_autoindex(idx);
  	if (idx >= SNDRV_CARDS)

  		return -ENOSPC;

  
  	/*

  	 * Check that we still have room for another sound card ...
  	 */

  	dev = pnp_request_card_device(pcard, pid->devs[0].id, NULL);

  	if (!dev)

  		return -ENODEV;

  	if (!pnp_is_active(dev)) {
  		if (pnp_activate_dev(dev) < 0) {

  			snd_printk(KERN_INFO "sscape: device is inactive
  ");

  			return -EBUSY;

  		}
  	}

  	/*

  	 * Create a new ALSA sound card entry, in anticipation
  	 * of detecting our hardware ...
  	 */

  	ret = snd_card_create(index[idx], id[idx], THIS_MODULE,
  			      sizeof(struct soundscape), &card);
  	if (ret < 0)
  		return ret;

  
  	sscape = get_card_soundscape(card);
  
  	/*
  	 * Identify card model ...
  	 */
  	if (!strncmp("ENS4081", pid->id, 7))
  		sscape->type = SSCAPE_VIVO;
  	else
  		sscape->type = SSCAPE_PNP;

  	/*

  	 * Read the correct parameters off the ISA PnP bus ...
  	 */
  	port[idx] = pnp_port_start(dev, 0);
  	irq[idx] = pnp_irq(dev, 0);
  	mpu_irq[idx] = pnp_irq(dev, 1);
  	dma[idx] = pnp_dma(dev, 0) & 0x03;

  	if (sscape->type == SSCAPE_PNP) {
  		dma2[idx] = dma[idx];
  		wss_port[idx] = CODEC_IO(port[idx]);
  	} else {
  		wss_port[idx] = pnp_port_start(dev, 1);
  		dma2[idx] = pnp_dma(dev, 1);
  	}

  	snd_card_set_dev(card, &pcard->card->dev);

  	ret = create_sscape(idx, card);

  	if (ret < 0)

  		goto _release_card;

  	ret = snd_card_register(card);
  	if (ret < 0) {

  		snd_printk(KERN_ERR "sscape: Failed to register sound card
  ");

  		goto _release_card;

  	}
  
  	pnp_set_card_drvdata(pcard, card);
  	++idx;

  	return 0;

  _release_card:
  	snd_card_free(card);

  	return ret;
  }
  
  static void __devexit sscape_pnp_remove(struct pnp_card_link * pcard)
  {

  	snd_card_free(pnp_get_card_drvdata(pcard));

  	pnp_set_card_drvdata(pcard, NULL);

  }
  
  static struct pnp_card_driver sscape_pnpc_driver = {
  	.flags = PNP_DRIVER_RES_DO_NOT_CHANGE,
  	.name = "sscape",
  	.id_table = sscape_pnpids,
  	.probe = sscape_pnp_detect,
  	.remove = __devexit_p(sscape_pnp_remove),
  };
  
  #endif /* CONFIG_PNP */

  static int __init sscape_init(void)
  {

  	int err;

  	err = isa_register_driver(&snd_sscape_driver, SNDRV_CARDS);

  #ifdef CONFIG_PNP

  	if (!err)
  		isa_registered = 1;
  
  	err = pnp_register_card_driver(&sscape_pnpc_driver);
  	if (!err)

  		pnp_registered = 1;

  
  	if (isa_registered)
  		err = 0;

  #endif

  	return err;

  }

  static void __exit sscape_exit(void)
  {
  #ifdef CONFIG_PNP
  	if (pnp_registered)
  		pnp_unregister_card_driver(&sscape_pnpc_driver);

  	if (isa_registered)

  #endif

  		isa_unregister_driver(&snd_sscape_driver);

  }

  module_init(sscape_init);
  module_exit(sscape_exit);