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menu "Kernel hacking"

source "lib/Kconfig.debug"

config GPROF
	bool "Enable gprof support"
	depends on DEBUG_INFO && FRAME_POINTER
	help
	  This allows profiling of a User-Mode Linux kernel with the gprof
	  utility.

	  See <http://user-mode-linux.sourceforge.net/old/gprof.html> for more
	  details.

	  If you're involved in UML kernel development and want to use gprof,
	  say Y.  If you're unsure, say N.

config GCOV
	bool "Enable gcov support"
	depends on DEBUG_INFO
	help
	  This option allows developers to retrieve coverage data from a UML
	  session.

	  See <http://user-mode-linux.sourceforge.net/old/gprof.html> for more
	  details.

	  If you're involved in UML kernel development and want to use gcov,
	  say Y.  If you're unsure, say N.

config DEBUG_STACK_USAGE
	bool "Stack utilization instrumentation"
	default N
	help
	  Track the maximum kernel stack usage - this will look at each
	  kernel stack at process exit and log it if it's the deepest
	  stack seen so far.

	  This option will slow down process creation and destruction somewhat.
endmenu
tion> The LITMUS^RT kernel.Bjoern Brandenburg
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path: root/sound/isa/sscape.c
blob: 29bba8cc3ef30d658315d3cee560e0cfa87989eb (plain) (tree)
























                                                                             

                                  









































                                                                                            

                                                             

                 
                          







                                                       

















































                                   


                                













                                                             
                                                                        



                                                       
                                                                               



                                                         
                                                                            
























































































































































                                                                                                    
                                                              






                                                               
                                                                   

















                                                                                                              
                                               

                                                                    
                                                  



                                     



































                                                                                      
                                                  

























                                                                   
                                                  













































































































































































































                                                                                                           
                                                                   

















                                                                      
                                                                      









                                                                      
                                                                    















































                                                                                                                         

                                                            







                                                  

                                                           
 

                                                          














                                                                                      

                                                           
 

                                                          



































                                                                                                                   
                                                 




















































































                                                                          
                                               
























                                                                                     
                                                 











                                                                        
                                                                                                  

                                                              
                                    







                                                                   
                                                                                     

















                                                         
                                                                                                                    


































                                                                               
                                                                                                                   




































                                                                               
                                                                                           

                                                                       
                                











                                                                          
                                    





































































                                                                                                                               



                                                           
                                                                     
 
                              



                                           
                       






                                                              
                                           
                                     
                                                                          


                              
                                                   
                                         
                                                                          

                              
                          




                                                              

                                                                             





                                                            

                                                                             






                                                              

                                                                       







                                           
                                







                                                                                            
                                                              









































                                                                                    
                                                                                              






                                                               
                                                                                   
                                                                             
                                                           


                                   
                                                                                           
                                                                                    
                                                  







                                                  






















                                                                       
                           

                        
                                          




                   



































                                                                           



                                                     
                                                             
                    



                 


                                                                            
                           

                              





                                                                   
                                                           
                               




















                                                                     
                                                                    

                               
 



                                                                         


                 




















                                                                           




                                                                     
                                                   
                                          











                                                    



                                                        
                 

                                                                
      




                                                                
                                           
 





                                                           













                                                                       


                                                   

                                                                                                   

                                     




                                          


                                                                       

                                              
                 
                                             
         
                 



                                

 

                             
                                












                                                             

                                    
                           
                 

                                                               
      




                         
/*
 *   Low-level ALSA driver for the ENSONIQ SoundScape PnP
 *   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 <sound/driver.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/pnp.h>
#include <linux/spinlock.h>
#include <linux/moduleparam.h>
#include <asm/dma.h>
#include <sound/core.h>
#include <sound/hwdep.h>
#include <sound/cs4231.h>
#include <sound/mpu401.h>
#include <sound/initval.h>

#include <sound/sscape_ioctl.h>


MODULE_AUTHOR("Chris Rankin");
MODULE_DESCRIPTION("ENSONIQ SoundScape PnP driver");
MODULE_LICENSE("GPL");

static int index[SNDRV_CARDS] __devinitdata = SNDRV_DEFAULT_IDX;
static char* id[SNDRV_CARDS] __devinitdata = SNDRV_DEFAULT_STR;
static long port[SNDRV_CARDS] __devinitdata = { [0 ... (SNDRV_CARDS-1)] = SNDRV_AUTO_PORT };
static int irq[SNDRV_CARDS] __devinitdata = SNDRV_DEFAULT_IRQ;
static int mpu_irq[SNDRV_CARDS] __devinitdata = SNDRV_DEFAULT_IRQ;
static int dma[SNDRV_CARDS] __devinitdata = SNDRV_DEFAULT_DMA;

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(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.");

static struct platform_device *platform_devices[SNDRV_CARDS];
  
#ifdef CONFIG_PNP
static int pnp_registered;
static struct pnp_card_device_id sscape_pnpids[] = {
	{ .id = "ENS3081", .devs = { { "ENS0000" } } },
	{ .id = "" }	/* end */
};

MODULE_DEVICE_TABLE(pnp_card, sscape_pnpids);
#endif


#define MPU401_IO(i)     ((i) + 0)
#define MIDI_DATA_IO(i)  ((i) + 0)
#define MIDI_CTRL_IO(i)  ((i) + 1)
#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


#define AD1845_FREQ_SEL_MSB    0x16
#define AD1845_FREQ_SEL_LSB    0x17

struct soundscape {
	spinlock_t lock;
	unsigned io_base;
	int codec_type;
	int ic_type;
	struct resource *io_res;
	struct snd_cs4231 *chip;
	struct snd_mpu401 *mpu;
	struct snd_hwdep *hw;

	/*
	 * The MIDI device won't work until we've loaded
	 * its firmware via a hardware-dependent device IOCTL
	 */
	spinlock_t fwlock;
	int hw_in_use;
	unsigned long midi_usage;
	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);
}

static inline struct soundscape *get_mpu401_soundscape(struct snd_mpu401 * mpu)
{
	return (struct soundscape *) (mpu->private_data);
}

static inline struct soundscape *get_hwdep_soundscape(struct snd_hwdep * hw)
{
	return (struct soundscape *) (hw->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\n", 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(MIDI_CTRL_IO(mpu->port)) & 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, MIDI_DATA_IO(mpu->port));
}

/*
 * 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 inline void activate_ad1845_unsafe(unsigned io_base)
{
	sscape_write_unsafe(io_base, GA_HMCTL_REG, (sscape_read_unsafe(io_base, GA_HMCTL_REG) & 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)
{
	register struct soundscape *sscape = get_card_soundscape(c);
	release_and_free_resource(sscape->io_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 inline 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)
{
	while (timeout != 0) {
		unsigned long flags;
		unsigned char x;

		schedule_timeout_interruptible(1);

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

		--timeout;
	} /* while */

	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)
{
	while (timeout != 0) {
		unsigned long flags;
		unsigned char x;

		schedule_timeout_interruptible(1);

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

		--timeout;
	} /* while */

	return 0;
}

/*
 * Upload a byte-stream into the SoundScape using DMA channel A.
 */
static int upload_dma_data(struct soundscape *s,
                           const unsigned char __user *data,
                           size_t size)
{
	unsigned long flags;
	struct snd_dma_buffer dma;
	int ret;

	if (!get_dmabuf(&dma, PAGE_ALIGN(size)))
		return -ENOMEM;

	spin_lock_irqsave(&s->lock, flags);

	/*
	 * Reset the board ...
	 */
	sscape_write_unsafe(s->io_base, GA_HMCTL_REG, sscape_read_unsafe(s->io_base, GA_HMCTL_REG) & 0x3f);

	/*
	 * Enable the DMA channels and configure them ...
	 */
	sscape_write_unsafe(s->io_base, GA_DMACFG_REG, 0x50);
	sscape_write_unsafe(s->io_base, GA_DMAA_REG, (s->chip->dma1 << 4) | DMA_8BIT);
	sscape_write_unsafe(s->io_base, GA_DMAB_REG, 0x20);

	/*
	 * Take the board out of reset ...
	 */
	sscape_write_unsafe(s->io_base, GA_HMCTL_REG, sscape_read_unsafe(s->io_base, GA_HMCTL_REG) | 0x80);

	/*
	 * Upload the user's data (firmware?) to the SoundScape
	 * board through the DMA channel ...
	 */
	while (size != 0) {
		unsigned long len;

		/*
		 * Apparently, copying to/from userspace can sleep.
		 * We are therefore forbidden from holding any
		 * spinlocks while we copy ...
		 */
		spin_unlock_irqrestore(&s->lock, flags);

		/*
		 * Remember that the data that we want to DMA
		 * comes from USERSPACE. We have already verified
		 * the userspace pointer ...
		 */
		len = min(size, dma.bytes);
		len -= __copy_from_user(dma.area, data, len);
		data += len;
		size -= len;

		/*
		 * Grab that spinlock again, now that we've
		 * finished copying!
		 */
		spin_lock_irqsave(&s->lock, flags);

		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\n");
			ret = -EAGAIN;
			goto _release_dma;
		}
	} /* while */

	set_host_mode_unsafe(s->io_base);

	/*
	 * Boot the board ... (I think)
	 */
	sscape_write_unsafe(s->io_base, GA_HMCTL_REG, sscape_read_unsafe(s->io_base, GA_HMCTL_REG) | 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, 5)) {
		snd_printk(KERN_ERR "sscape: No response from on-board processor after upload\n");
		ret = -EAGAIN;
	} else if (!host_startup_ack(s, 5)) {
		snd_printk(KERN_ERR "sscape: SoundScape failed to initialise\n");
		ret = -EAGAIN;
	}

	_release_dma:
	/*
	 * NOTE!!! We are NOT holding any spinlocks at this point !!!
	 */
	sscape_write(s, GA_DMAA_REG, (s->ic_type == IC_ODIE ? 0x70 : 0x40));
	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.
 *
 * NOTE: The boot-block data resides in USER-SPACE!!!
 *       However, we have already verified its memory
 *       addresses by the time we get here.
 */
static int sscape_upload_bootblock(struct soundscape *sscape, struct sscape_bootblock __user *bb)
{
	unsigned long flags;
	int data = 0;
	int ret;

	ret = upload_dma_data(sscape, bb->code, sizeof(bb->code));

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

	if (ret == 0) {
		if (data < 0) {
			snd_printk(KERN_ERR "sscape: timeout reading firmware version\n");
			ret = -EAGAIN;
		}
		else if (__copy_to_user(&bb->version, &data, sizeof(bb->version))) {
			ret = -EFAULT;
		}
	}

	return ret;
}

/*
 * Upload the microcode into the SoundScape. The
 * microcode is 64K of data, and if we try to copy
 * it into a local variable then we will SMASH THE
 * KERNEL'S STACK! We therefore leave it in USER
 * SPACE, and save ourselves from copying it at all.
 */
static int sscape_upload_microcode(struct soundscape *sscape,
                                   const struct sscape_microcode __user *mc)
{
	unsigned long flags;
	char __user *code;
	int err;

	/*
	 * We are going to have to copy this data into a special
	 * DMA-able buffer before we can upload it. We shall therefore
	 * just check that the data pointer is valid for now.
	 *
	 * NOTE: This buffer is 64K long! That's WAY too big to
	 *       copy into a stack-temporary anyway.
	 */
	if ( get_user(code, &mc->code) ||
	     !access_ok(VERIFY_READ, code, SSCAPE_MICROCODE_SIZE) )
		return -EFAULT;

	if ((err = upload_dma_data(sscape, code, SSCAPE_MICROCODE_SIZE)) == 0) {
		snd_printk(KERN_INFO "sscape: MIDI firmware loaded\n");
	}

	spin_lock_irqsave(&sscape->lock, flags);
	set_midi_mode_unsafe(sscape->io_base);
	spin_unlock_irqrestore(&sscape->lock, flags);

	initialise_mpu401(sscape->mpu);

	return err;
}

/*
 * Hardware-specific device functions, to implement special
 * IOCTLs for the SoundScape card. This is how we upload
 * the microcode into the card, for example, and so we
 * must ensure that no two processes can open this device
 * simultaneously, and that we can't open it at all if
 * someone is using the MIDI device.
 */
static int sscape_hw_open(struct snd_hwdep * hw, struct file *file)
{
	register struct soundscape *sscape = get_hwdep_soundscape(hw);
	unsigned long flags;
	int err;

	spin_lock_irqsave(&sscape->fwlock, flags);

	if ((sscape->midi_usage != 0) || sscape->hw_in_use) {
		err = -EBUSY;
	} else {
		sscape->hw_in_use = 1;
		err = 0;
	}

	spin_unlock_irqrestore(&sscape->fwlock, flags);
	return err;
}

static int sscape_hw_release(struct snd_hwdep * hw, struct file *file)
{
	register struct soundscape *sscape = get_hwdep_soundscape(hw);
	unsigned long flags;

	spin_lock_irqsave(&sscape->fwlock, flags);
	sscape->hw_in_use = 0;
	spin_unlock_irqrestore(&sscape->fwlock, flags);
	return 0;
}

static int sscape_hw_ioctl(struct snd_hwdep * hw, struct file *file,
                           unsigned int cmd, unsigned long arg)
{
	struct soundscape *sscape = get_hwdep_soundscape(hw);
	int err = -EBUSY;

	switch (cmd) {
	case SND_SSCAPE_LOAD_BOOTB:
		{
			register struct sscape_bootblock __user *bb = (struct sscape_bootblock __user *) arg;

			/*
			 * We are going to have to copy this data into a special
			 * DMA-able buffer before we can upload it. We shall therefore
			 * just check that the data pointer is valid for now ...
			 */
			if ( !access_ok(VERIFY_READ, bb->code, sizeof(bb->code)) )
				return -EFAULT;

			/*
			 * Now check that we can write the firmware version number too...
			 */
			if ( !access_ok(VERIFY_WRITE, &bb->version, sizeof(bb->version)) )
				return -EFAULT;

			err = sscape_upload_bootblock(sscape, bb);
		}
		break;

	case SND_SSCAPE_LOAD_MCODE:
		{
			register const struct sscape_microcode __user *mc = (const struct sscape_microcode __user *) arg;

			err = sscape_upload_microcode(sscape, mc);
		}
		break;

	default:
		err = -EINVAL;
		break;
	} /* switch */

	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_cs4231 *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);
	set_host_mode_unsafe(s->io_base);

	if (host_write_ctrl_unsafe(s->io_base, CMD_GET_MIDI_VOL, 100)) {
		uctl->value.integer.value[0] = host_read_ctrl_unsafe(s->io_base, 100);
	}

	set_midi_mode_unsafe(s->io_base);
	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_cs4231 *chip = snd_kcontrol_chip(kctl);
	struct snd_card *card = chip->card;
	register struct soundscape *s = get_card_soundscape(card);
	unsigned long flags;
	int change;

	spin_lock_irqsave(&s->lock, flags);

	/*
	 * 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 == ((unsigned char) uctl->value.integer. value[0] & 127)) {
		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, ((unsigned char) uctl->value.integer. value[0]) & 127, 100)
	          && host_write_ctrl_unsafe(s->io_base, CMD_XXX_MIDI_VOL, 100));
      __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 irq)
{
	static const int valid_irq[] = { 9, 5, 7, 10 };
	unsigned cfg;

	for (cfg = 0; cfg < ARRAY_SIZE(valid_irq); ++cfg) {
		if (irq == valid_irq[cfg])
			return cfg;
	} /* for */

	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)
{
	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->codec_type = 1;
		s->ic_type = IC_ODIE;
	} else if ((d & 0x60) != 0) {
		s->codec_type = 2;
		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;
	if ((inb(ODIE_DATA_IO(s->io_base)) & 0x9f) != 0x0e)
		goto _done;

	/*
	 * 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)
{
	int err;

	if (!verify_mpu401(mpu)) {
		snd_printk(KERN_ERR "sscape: MIDI disabled, please load firmware\n");
		err = -ENODEV;
	} else {
		register struct soundscape *sscape = get_mpu401_soundscape(mpu);
		unsigned long flags;

		spin_lock_irqsave(&sscape->fwlock, flags);

		if (sscape->hw_in_use || (sscape->midi_usage == ULONG_MAX)) {
			err = -EBUSY;
		} else {
			++(sscape->midi_usage);
			err = 0;
		}

		spin_unlock_irqrestore(&sscape->fwlock, flags);
	}

	return err;
}

static void mpu401_close(struct snd_mpu401 * mpu)
{
	register struct soundscape *sscape = get_mpu401_soundscape(mpu);
	unsigned long flags;

	spin_lock_irqsave(&sscape->fwlock, flags);
	--(sscape->midi_usage);
	spin_unlock_irqrestore(&sscape->fwlock, flags);
}

/*
 * 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;

#define MPU401_SHARE_HARDWARE  1
	if ((err = snd_mpu401_uart_new(card, devnum,
	                               MPU401_HW_MPU401,
	                               port, MPU401_SHARE_HARDWARE,
	                               irq, SA_INTERRUPT,
	                               &rawmidi)) == 0) {
		struct snd_mpu401 *mpu = (struct snd_mpu401 *) rawmidi->private_data;
		mpu->open_input = mpu401_open;
		mpu->open_output = mpu401_open;
		mpu->close_input = mpu401_close;
		mpu->close_output = mpu401_close;
		mpu->private_data = sscape;
		sscape->mpu = mpu;

		initialise_mpu401(mpu);
	}

	return err;
}


/*
 * Override for the CS4231 playback format function.
 * The AD1845 has much simpler format and rate selection.
 */
static void ad1845_playback_format(struct snd_cs4231 * chip, struct snd_pcm_hw_params *params, unsigned char format)
{
	unsigned long flags;
	unsigned rate = params_rate(params);

	/*
	 * The AD1845 can't handle sample frequencies
	 * outside of 4 kHZ to 50 kHZ
	 */
	if (rate > 50000)
		rate = 50000;
	else if (rate < 4000)
		rate = 4000;

	spin_lock_irqsave(&chip->reg_lock, flags);

	/*
	 * Program the AD1845 correctly for the playback stream.
	 * Note that we do NOT need to toggle the MCE bit because
	 * the PLAYBACK_ENABLE bit of the Interface Configuration
	 * register is set.
	 * 
	 * NOTE: We seem to need to write to the MSB before the LSB
	 *       to get the correct sample frequency.
	 */
	snd_cs4231_out(chip, CS4231_PLAYBK_FORMAT, (format & 0xf0));
	snd_cs4231_out(chip, AD1845_FREQ_SEL_MSB, (unsigned char) (rate >> 8));
	snd_cs4231_out(chip, AD1845_FREQ_SEL_LSB, (unsigned char) rate);

	spin_unlock_irqrestore(&chip->reg_lock, flags);
}

/*
 * Override for the CS4231 capture format function. 
 * The AD1845 has much simpler format and rate selection.
 */
static void ad1845_capture_format(struct snd_cs4231 * chip, struct snd_pcm_hw_params *params, unsigned char format)
{
	unsigned long flags;
	unsigned rate = params_rate(params);

	/*
	 * The AD1845 can't handle sample frequencies 
	 * outside of 4 kHZ to 50 kHZ
	 */
	if (rate > 50000)
		rate = 50000;
	else if (rate < 4000)
		rate = 4000;

	spin_lock_irqsave(&chip->reg_lock, flags);

	/*
	 * Program the AD1845 correctly for the playback stream.
	 * Note that we do NOT need to toggle the MCE bit because
	 * the CAPTURE_ENABLE bit of the Interface Configuration
	 * register is set.
	 *
	 * NOTE: We seem to need to write to the MSB before the LSB
	 *       to get the correct sample frequency.
	 */
	snd_cs4231_out(chip, CS4231_REC_FORMAT, (format & 0xf0));
	snd_cs4231_out(chip, AD1845_FREQ_SEL_MSB, (unsigned char) (rate >> 8));
	snd_cs4231_out(chip, AD1845_FREQ_SEL_LSB, (unsigned char) rate);

	spin_unlock_irqrestore(&chip->reg_lock, flags);
}

/*
 * 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)
{
	register struct soundscape *sscape = get_card_soundscape(card);
	struct snd_cs4231 *chip;
	int err;

#define CS4231_SHARE_HARDWARE  (CS4231_HWSHARE_DMA1 | CS4231_HWSHARE_DMA2)
	/*
	 * The AD1845 PCM device is only half-duplex, and so
	 * we only give it one DMA channel ...
	 */
	if ((err = snd_cs4231_create(card,
				     port, -1, irq, dma1, dma1,
				     CS4231_HW_DETECT,
				     CS4231_HWSHARE_DMA1, &chip)) == 0) {
		unsigned long flags;
		struct snd_pcm *pcm;

#define AD1845_FREQ_SEL_ENABLE  0x08

#define AD1845_PWR_DOWN_CTRL   0x1b
#define AD1845_CRYS_CLOCK_SEL  0x1d

/*
 * It turns out that the PLAYBACK_ENABLE bit is set
 * by the lowlevel driver ...
 *
#define AD1845_IFACE_CONFIG  \
           (CS4231_AUTOCALIB | CS4231_RECORD_ENABLE | CS4231_PLAYBACK_ENABLE)
    snd_cs4231_mce_up(chip);
    spin_lock_irqsave(&chip->reg_lock, flags);
    snd_cs4231_out(chip, CS4231_IFACE_CTRL, AD1845_IFACE_CONFIG);
    spin_unlock_irqrestore(&chip->reg_lock, flags);
    snd_cs4231_mce_down(chip);
 */

		/*
		 * 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_cs4231_mce_up(chip);
		spin_lock_irqsave(&chip->reg_lock, flags);
		snd_cs4231_out(chip, AD1845_CRYS_CLOCK_SEL, 0x20);
		spin_unlock_irqrestore(&chip->reg_lock, flags);
		snd_cs4231_mce_down(chip);

		/*
		 * More custom configuration:
		 * a) select "mode 2", and provide a current drive of 8 mA
		 * b) enable frequency selection (for capture/playback)
		 */
		spin_lock_irqsave(&chip->reg_lock, flags);
		snd_cs4231_out(chip, CS4231_MISC_INFO, (CS4231_MODE2 | 0x10));
		snd_cs4231_out(chip, AD1845_PWR_DOWN_CTRL, snd_cs4231_in(chip, AD1845_PWR_DOWN_CTRL) | AD1845_FREQ_SEL_ENABLE);
		spin_unlock_irqrestore(&chip->reg_lock, flags);

		if ((err = snd_cs4231_pcm(chip, 0, &pcm)) < 0) {
			snd_printk(KERN_ERR "sscape: No PCM device for AD1845 chip\n");
			goto _error;
		}

		if ((err = snd_cs4231_mixer(chip)) < 0) {
			snd_printk(KERN_ERR "sscape: No mixer device for AD1845 chip\n");
			goto _error;
		}

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

		strcpy(card->driver, "SoundScape");
		strcpy(card->shortname, pcm->name);
		snprintf(card->longname, sizeof(card->longname),
		         "%s at 0x%lx, IRQ %d, DMA %d\n",
		         pcm->name, chip->port, chip->irq, chip->dma1);
		chip->set_playback_format = ad1845_playback_format;
		chip->set_capture_format = ad1845_capture_format;
		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 **rcardp)
{
	struct snd_card *card;
	register struct soundscape *sscape;
	register unsigned dma_cfg;
	unsigned irq_cfg;
	unsigned mpu_irq_cfg;
	unsigned xport;
	struct resource *io_res;
	unsigned long flags;
	int err;

	/*
	 * Check that the user didn't pass us garbage data ...
	 */
	irq_cfg = get_irq_config(irq[dev]);
	if (irq_cfg == INVALID_IRQ) {
		snd_printk(KERN_ERR "sscape: Invalid IRQ %d\n", irq[dev]);
		return -ENXIO;
	}

	mpu_irq_cfg = get_irq_config(mpu_irq[dev]);
	if (mpu_irq_cfg == INVALID_IRQ) {