path: root/sound/oss/sb_audio.c

/*
 * sound/oss/sb_audio.c
 *
 * Audio routines for Sound Blaster compatible cards.
 *
 *
 * Copyright (C) by Hannu Savolainen 1993-1997
 *
 * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
 * Version 2 (June 1991). See the "COPYING" file distributed with this software
 * for more info.
 *
 * Changes
 *	Alan Cox	:	Formatting and clean ups
 *
 * Status
 *	Mostly working. Weird uart bug causing irq storms
 *
 * Daniel J. Rodriksson: Changes to make sb16 work full duplex.
 *                       Maybe other 16 bit cards in this code could behave
 *                       the same.
 * Chris Rankin:         Use spinlocks instead of CLI/STI
 */

#include <linux/spinlock.h>

#include "sound_config.h"

#include "sb_mixer.h"
#include "sb.h"

#include "sb_ess.h"

int sb_audio_open(int dev, int mode)
{
	sb_devc *devc = audio_devs[dev]->devc;
	unsigned long flags;

	if (devc == NULL)
	{
		  printk(KERN_ERR "Sound Blaster: incomplete initialization.\n");
		  return -ENXIO;
	}
	if (devc->caps & SB_NO_RECORDING && mode & OPEN_READ)
	{
		if (mode == OPEN_READ)
			return -EPERM;
	}
	spin_lock_irqsave(&devc->lock, flags);
	if (devc->opened)
	{
		  spin_unlock_irqrestore(&devc->lock, flags);
		  return -EBUSY;
	}
	if (devc->dma16 != -1 && devc->dma16 != devc->dma8 && !devc->duplex)
	{
		if (sound_open_dma(devc->dma16, "Sound Blaster 16 bit"))
		{
		  	spin_unlock_irqrestore(&devc->lock, flags);
			return -EBUSY;
		}
	}
	devc->opened = mode;
	spin_unlock_irqrestore(&devc->lock, flags);

	devc->irq_mode = IMODE_NONE;
	devc->irq_mode_16 = IMODE_NONE;
	devc->fullduplex = devc->duplex &&
		((mode & OPEN_READ) && (mode & OPEN_WRITE));
	sb_dsp_reset(devc);

	/* At first glance this check isn't enough, some ESS chips might not 
	 * have a RECLEV. However if they don't common_mixer_set will refuse 
	 * cause devc->iomap has no register mapping for RECLEV
	 */
	if (devc->model == MDL_ESS) ess_mixer_reload (devc, SOUND_MIXER_RECLEV);

	/* The ALS007 seems to require that the DSP be removed from the output */
	/* in order for recording to be activated properly.  This is done by   */
	/* setting the appropriate bits of the output control register 4ch to  */
	/* zero.  This code assumes that the output control registers are not  */
	/* used anywhere else and therefore the DSP bits are *always* ON for   */
	/* output and OFF for sampling.                                        */

	if (devc->submodel == SUBMDL_ALS007) 
	{
		if (mode & OPEN_READ) 
			sb_setmixer(devc,ALS007_OUTPUT_CTRL2,
				sb_getmixer(devc,ALS007_OUTPUT_CTRL2) & 0xf9);
		else
			sb_setmixer(devc,ALS007_OUTPUT_CTRL2,
				sb_getmixer(devc,ALS007_OUTPUT_CTRL2) | 0x06);
	}
	return 0;
}

void sb_audio_close(int dev)
{
	sb_devc *devc = audio_devs[dev]->devc;

	/* fix things if mmap turned off fullduplex */
	if(devc->duplex
	   && !devc->fullduplex
	   && (devc->opened & OPEN_READ) && (devc->opened & OPEN_WRITE))
	{
		struct dma_buffparms *dmap_temp;
		dmap_temp = audio_devs[dev]->dmap_out;
		audio_devs[dev]->dmap_out = audio_devs[dev]->dmap_in;
		audio_devs[dev]->dmap_in = dmap_temp;
	}
	audio_devs[dev]->dmap_out->dma = devc->dma8;
	audio_devs[dev]->dmap_in->dma = ( devc->duplex ) ?
		devc->dma16 : devc->dma8;

	if (devc->dma16 != -1 && devc->dma16 != devc->dma8 && !devc->duplex)
		sound_close_dma(devc->dma16);

	/* For ALS007, turn DSP output back on if closing the device for read */
	
	if ((devc->submodel == SUBMDL_ALS007) && (devc->opened & OPEN_READ)) 
	{
		sb_setmixer(devc,ALS007_OUTPUT_CTRL2,
			sb_getmixer(devc,ALS007_OUTPUT_CTRL2