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msnd.c

/*********************************************************************
 *
 * 2002/06/30 Karsten Wiese:
 *    removed kernel-version dependencies.
 *    ripped from linux kernel 2.4.18 (OSS Implementation) by me.
 *    In the OSS Version, this file is compiled to a separate MODULE, that is used
 *    by the pinnacle and the classic driver.
 *    since there is no classic driver for alsa yet (i dont have a classic & writing one blindfold is difficult)
 *    this file's object is statically linked into the pinnacle-driver-module for now.
 *    look for the string
 *          "uncomment this to make this a module again"
 *    to do guess what.
 *
 * the following is a copy of the 2.4.18 OSS FREE file-heading comment:
 *
 * msnd.c - Driver Base
 *
 * Turtle Beach MultiSound Sound Card Driver for Linux
 *
 * Copyright (C) 1998 Andrew Veliath
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * $Id: msnd.c,v 1.17 1999/03/21 16:50:09 andrewtv Exp $
 *
 ********************************************************************/
#define __NO_VERSION__
#include <sound/driver.h>
#include <sound/core.h>
#include <sound/initval.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/types.h>
#include <linux/delay.h>
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 10) /* enable_irq(), disable_irq() */
#include <linux/interrupt.h>
#else
#include <asm/irq.h>
#endif
#include <asm/io.h>
#include "msnd.h"

#define LOGNAME               "msnd"

#define MSND_MAX_DEVS         4

static multisound_dev_t       *devs[MSND_MAX_DEVS];
static int              num_devs;


int __init snd_msnd_register(multisound_dev_t *dev)
{
/* this is not really needed since alsa does the real (un)registration.
 * remove this later.
 */
      int i;

      for (i = 0; i < MSND_MAX_DEVS; ++i)
            if (devs[i] == NULL)
                  break;

      snd_printd( "snd_msnd_register(): %i\n", i);


      if (i == MSND_MAX_DEVS)
            return -ENOMEM;

      devs[i] = dev;
      ++num_devs;

//    MOD_INC_USE_COUNT;        uncomment this to make this a module again

      return 0;
}

void snd_msnd_unregister(multisound_dev_t *dev)
{
/* this is not really needed since alsa does the real (un)registration.
 * remove this later.
 */
      int i;

      for (i = 0; i < MSND_MAX_DEVS; ++i)
            if (devs[i] == dev)
                  break;

      if (i == MSND_MAX_DEVS) {
            printk(KERN_WARNING LOGNAME ": Unregistering unknown device\n");
            return;
      }

      devs[i] = NULL;
      --num_devs;

//    MOD_DEC_USE_COUNT;         uncomment this to make this a module again
}

int snd_msnd_get_num_devs(void)
{
      return num_devs;
}

multisound_dev_t *snd_msnd_get_dev(int j)
{
      int i;

      for (i = 0; i < MSND_MAX_DEVS && j; ++i)
            if (devs[i] != NULL)
                  --j;

      if (i == MSND_MAX_DEVS || j != 0)
            return NULL;

      return devs[i];
}

void snd_msnd_init_queue(unsigned long base, int start, int size)
{
      isa_writew(PCTODSP_BASED(start), base + JQS_wStart);
      isa_writew(PCTODSP_OFFSET(size) - 1, base + JQS_wSize);
      isa_writew(0, base + JQS_wHead);
      isa_writew(0, base + JQS_wTail);
}


int snd_msnd_wait_TXDE(multisound_dev_t *dev)
{
      register unsigned int io = dev->io;
      register int timeout = 1000;
    
      while(timeout-- > 0)
            if (inb(io + HP_ISR) & HPISR_TXDE)
                  return 0;

      return -EIO;
}

int snd_msnd_wait_HC0(multisound_dev_t *dev)
{
      register unsigned int io = dev->io;
      register int timeout = 1000;

      while(timeout-- > 0)
            if (!(inb(io + HP_CVR) & HPCVR_HC))
                  return 0;

      return -EIO;
}

int snd_msnd_send_dsp_cmd(multisound_dev_t *dev, BYTE cmd)
{
      unsigned long flags;

      spin_lock_irqsave(&dev->lock, flags);
      if (snd_msnd_wait_HC0(dev) == 0) {
            outb(cmd, dev->io + HP_CVR);
            spin_unlock_irqrestore(&dev->lock, flags);
            return 0;
      }
      spin_unlock_irqrestore(&dev->lock, flags);

      printk(KERN_DEBUG LOGNAME ": Send DSP command timeout\n");

      return -EIO;
}

int snd_msnd_send_word(multisound_dev_t *dev, unsigned char high,
               unsigned char mid, unsigned char low)
{
      register unsigned int io = dev->io;

      if (snd_msnd_wait_TXDE(dev) == 0) {
            outb(high, io + HP_TXH);
            outb(mid, io + HP_TXM);
            outb(low, io + HP_TXL);
            return 0;
      }

      printk(KERN_DEBUG LOGNAME ": Send host word timeout\n");

      return -EIO;
}

int snd_msnd_upload_host(multisound_dev_t *dev, char *bin, int len)
{
      int i;

      if (len % 3 != 0) {
            printk(KERN_WARNING LOGNAME ": Upload host data not multiple of 3!\n");       
            return -EINVAL;
      }

      for (i = 0; i < len; i += 3)
            if (snd_msnd_send_word(dev, bin[i], bin[i + 1], bin[i + 2]) != 0)
                  return -EIO;

      inb(dev->io + HP_RXL);
      inb(dev->io + HP_CVR);

      return 0;
}

int snd_msnd_enable_irq(multisound_dev_t *dev)
{
      unsigned long flags;

      if (dev->irq_ref++)
            return 0;

      printk(KERN_DEBUG LOGNAME ": Enabling IRQ\n");

      spin_lock_irqsave(&dev->lock, flags);
      if (snd_msnd_wait_TXDE(dev) == 0) {
            outb(inb(dev->io + HP_ICR) | HPICR_TREQ, dev->io + HP_ICR);
            if (dev->type == msndClassic)
                  outb(dev->irqid, dev->io + HP_IRQM);
            outb(inb(dev->io + HP_ICR) & ~HPICR_TREQ, dev->io + HP_ICR);
            outb(inb(dev->io + HP_ICR) | HPICR_RREQ, dev->io + HP_ICR);
            enable_irq(dev->irq);
            snd_msnd_init_queue(dev->DSPQ, dev->dspq_data_buff, dev->dspq_buff_size);
            spin_unlock_irqrestore(&dev->lock, flags);
            return 0;
      }
      spin_unlock_irqrestore(&dev->lock, flags);

      printk(KERN_DEBUG LOGNAME ": Enable IRQ failed\n");

      return -EIO;
}

int snd_msnd_disable_irq(multisound_dev_t *dev)
{
      unsigned long flags;

      if (--dev->irq_ref > 0)
            return 0;

      if (dev->irq_ref < 0)
            printk(KERN_DEBUG LOGNAME ": IRQ ref count is %d\n", dev->irq_ref);

      printk(KERN_DEBUG LOGNAME ": Disabling IRQ\n");

      spin_lock_irqsave(&dev->lock, flags);
      if (snd_msnd_wait_TXDE(dev) == 0) {
            outb(inb(dev->io + HP_ICR) & ~HPICR_RREQ, dev->io + HP_ICR);
            if (dev->type == msndClassic)
                  outb(HPIRQ_NONE, dev->io + HP_IRQM);
            disable_irq(dev->irq);
            spin_unlock_irqrestore(&dev->lock, flags);
            return 0;
      }
      spin_unlock_irqrestore(&dev->lock, flags);

      printk(KERN_DEBUG LOGNAME ": Disable IRQ failed\n");

      return -EIO;
}

#if 0

EXPORT_SYMBOL(snd_msnd_register);
EXPORT_SYMBOL(snd_msnd_unregister);
EXPORT_SYMBOL(snd_msnd_get_num_devs);
EXPORT_SYMBOL(snd_msnd_get_dev);

EXPORT_SYMBOL(snd_msnd_init_queue);

EXPORT_SYMBOL(snd_msnd_fifo_init);
EXPORT_SYMBOL(snd_msnd_fifo_free);
EXPORT_SYMBOL(snd_msnd_fifo_alloc);
EXPORT_SYMBOL(snd_msnd_fifo_make_empty);
EXPORT_SYMBOL(snd_msnd_fifo_write);
EXPORT_SYMBOL(snd_msnd_fifo_read);

EXPORT_SYMBOL(snd_msnd_wait_TXDE);
EXPORT_SYMBOL(snd_msnd_wait_HC0);
EXPORT_SYMBOL(snd_msnd_send_dsp_cmd);
EXPORT_SYMBOL(snd_msnd_send_word);
EXPORT_SYMBOL(snd_msnd_upload_host);

EXPORT_SYMBOL(snd_msnd_enable_irq);
EXPORT_SYMBOL(snd_msnd_disable_irq);

MODULE_AUTHOR                       ("Andrew Veliath <andrewtv@usa.net>");
MODULE_DESCRIPTION                  ("Turtle Beach MultiSound Driver Base");
MODULE_LICENSE("GPL");


int init_module(void)
{
      return 0;
}

void cleanup_module(void)
{
}

#endif

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