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root/sound/oss/msnd.c

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DEFINITIONS

This source file includes following definitions.
  1. msnd_register
  2. msnd_unregister
  3. msnd_init_queue
  4. msnd_fifo_init
  5. msnd_fifo_free
  6. msnd_fifo_alloc
  7. msnd_fifo_make_empty
  8. msnd_fifo_write_io
  9. msnd_fifo_write
  10. msnd_fifo_read_io
  11. msnd_fifo_read
  12. msnd_wait_TXDE
  13. msnd_wait_HC0
  14. msnd_send_dsp_cmd
  15. msnd_send_word
  16. msnd_upload_host
  17. msnd_enable_irq
  18. msnd_disable_irq
  19. init_module
  20. cleanup_module

/*********************************************************************
 *
 * 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.
 *
 ********************************************************************/

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/types.h>
#include <linux/delay.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/interrupt.h>

#include <asm/io.h>
#include <asm/uaccess.h>
#include <linux/spinlock.h>
#include <asm/irq.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 msnd_register(multisound_dev_t *dev)
{
        int i;

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

        if (i == MSND_MAX_DEVS)
                return -ENOMEM;

        devs[i] = dev;
        ++num_devs;
        return 0;
}

void msnd_unregister(multisound_dev_t *dev)
{
        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;
}

void msnd_init_queue(void __iomem *base, int start, int size)
{
        writew(PCTODSP_BASED(start), base + JQS_wStart);
        writew(PCTODSP_OFFSET(size) - 1, base + JQS_wSize);
        writew(0, base + JQS_wHead);
        writew(0, base + JQS_wTail);
}

void msnd_fifo_init(msnd_fifo *f)
{
        f->data = NULL;
}

void msnd_fifo_free(msnd_fifo *f)
{
        vfree(f->data);
        f->data = NULL;
}

int msnd_fifo_alloc(msnd_fifo *f, size_t n)
{
        msnd_fifo_free(f);
        f->data = (char *)vmalloc(n);
        f->n = n;
        f->tail = 0;
        f->head = 0;
        f->len = 0;

        if (!f->data)
                return -ENOMEM;

        return 0;
}

void msnd_fifo_make_empty(msnd_fifo *f)
{
        f->len = f->tail = f->head = 0;
}

int msnd_fifo_write_io(msnd_fifo *f, char __iomem *buf, size_t len)
{
        int count = 0;

        while ((count < len) && (f->len != f->n)) {

                int nwritten;

                if (f->head <= f->tail) {
                        nwritten = len - count;
                        if (nwritten > f->n - f->tail)
                                nwritten = f->n - f->tail;
                }
                else {
                        nwritten = f->head - f->tail;
                        if (nwritten > len - count)
                                nwritten = len - count;
                }

                memcpy_fromio(f->data + f->tail, buf, nwritten);

                count += nwritten;
                buf += nwritten;
                f->len += nwritten;
                f->tail += nwritten;
                f->tail %= f->n;
        }

        return count;
}

int msnd_fifo_write(msnd_fifo *f, const char *buf, size_t len)
{
        int count = 0;

        while ((count < len) && (f->len != f->n)) {

                int nwritten;

                if (f->head <= f->tail) {
                        nwritten = len - count;
                        if (nwritten > f->n - f->tail)
                                nwritten = f->n - f->tail;
                }
                else {
                        nwritten = f->head - f->tail;
                        if (nwritten > len - count)
                                nwritten = len - count;
                }

                memcpy(f->data + f->tail, buf, nwritten);

                count += nwritten;
                buf += nwritten;
                f->len += nwritten;
                f->tail += nwritten;
                f->tail %= f->n;
        }

        return count;
}

int msnd_fifo_read_io(msnd_fifo *f, char __iomem *buf, size_t len)
{
        int count = 0;

        while ((count < len) && (f->len > 0)) {

                int nread;

                if (f->tail <= f->head) {
                        nread = len - count;
                        if (nread > f->n - f->head)
                                nread = f->n - f->head;
                }
                else {
                        nread = f->tail - f->head;
                        if (nread > len - count)
                                nread = len - count;
                }

                memcpy_toio(buf, f->data + f->head, nread);

                count += nread;
                buf += nread;
                f->len -= nread;
                f->head += nread;
                f->head %= f->n;
        }

        return count;
}

int msnd_fifo_read(msnd_fifo *f, char *buf, size_t len)
{
        int count = 0;

        while ((count < len) && (f->len > 0)) {

                int nread;

                if (f->tail <= f->head) {
                        nread = len - count;
                        if (nread > f->n - f->head)
                                nread = f->n - f->head;
                }
                else {
                        nread = f->tail - f->head;
                        if (nread > len - count)
                                nread = len - count;
                }

                memcpy(buf, f->data + f->head, nread);

                count += nread;
                buf += nread;
                f->len -= nread;
                f->head += nread;
                f->head %= f->n;
        }

        return count;
}

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

        return -EIO;
}

static int msnd_wait_HC0(multisound_dev_t *dev)
{
        register unsigned int io = dev->io;
        register int timeout = 1000;

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

        return -EIO;
}

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

        spin_lock_irqsave(&dev->lock, flags);
        if (msnd_wait_HC0(dev) == 0) {
                msnd_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 msnd_send_word(multisound_dev_t *dev, unsigned char high,
                   unsigned char mid, unsigned char low)
{
        register unsigned int io = dev->io;

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

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

        return -EIO;
}

int 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 (msnd_send_word(dev, bin[i], bin[i + 1], bin[i + 2]) != 0)
                        return -EIO;

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

        return 0;
}

int 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 (msnd_wait_TXDE(dev) == 0) {
                msnd_outb(msnd_inb(dev->io + HP_ICR) | HPICR_TREQ, dev->io + HP_ICR);
                if (dev->type == msndClassic)
                        msnd_outb(dev->irqid, dev->io + HP_IRQM);
                msnd_outb(msnd_inb(dev->io + HP_ICR) & ~HPICR_TREQ, dev->io + HP_ICR);
                msnd_outb(msnd_inb(dev->io + HP_ICR) | HPICR_RREQ, dev->io + HP_ICR);
                enable_irq(dev->irq);
                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 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 (msnd_wait_TXDE(dev) == 0) {
                msnd_outb(msnd_inb(dev->io + HP_ICR) & ~HPICR_RREQ, dev->io + HP_ICR);
                if (dev->type == msndClassic)
                        msnd_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;
}

#ifndef LINUX20
EXPORT_SYMBOL(msnd_register);
EXPORT_SYMBOL(msnd_unregister);

EXPORT_SYMBOL(msnd_init_queue);

EXPORT_SYMBOL(msnd_fifo_init);
EXPORT_SYMBOL(msnd_fifo_free);
EXPORT_SYMBOL(msnd_fifo_alloc);
EXPORT_SYMBOL(msnd_fifo_make_empty);
EXPORT_SYMBOL(msnd_fifo_write_io);
EXPORT_SYMBOL(msnd_fifo_read_io);
EXPORT_SYMBOL(msnd_fifo_write);
EXPORT_SYMBOL(msnd_fifo_read);

EXPORT_SYMBOL(msnd_send_dsp_cmd);
EXPORT_SYMBOL(msnd_send_word);
EXPORT_SYMBOL(msnd_upload_host);

EXPORT_SYMBOL(msnd_enable_irq);
EXPORT_SYMBOL(msnd_disable_irq);
#endif

#ifdef MODULE
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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