path: root/sound/oss/ad1816.c

/*
 *
 * AD1816 lowlevel sound driver for Linux 2.6.0 and above
 *
 * Copyright (C) 1998-2003 by Thorsten Knabe <linux@thorsten-knabe.de>
 *
 * Based on the CS4232/AD1848 driver Copyright (C) by Hannu Savolainen 1993-1996
 *
 *
 * version: 1.5
 * status: beta
 * date: 2003/07/15
 *
 * Changes:
 *	Oleg Drokin: Some cleanup of load/unload functions.	1998/11/24
 *	
 *	Thorsten Knabe: attach and unload rewritten, 
 *	some argument checks added				1998/11/30
 *
 *	Thorsten Knabe: Buggy isa bridge workaround added	1999/01/16
 *	
 *	David Moews/Thorsten Knabe: Introduced options 
 *	parameter. Added slightly modified patch from 
 *	David Moews to disable dsp audio sources by setting 
 *	bit 0 of options parameter. This seems to be
 *	required by some Aztech/Newcom SC-16 cards.		1999/04/18
 *
 *	Christoph Hellwig: Adapted to module_init/module_exit.	2000/03/03
 *
 *	Christoph Hellwig: Added isapnp support			2000/03/15
 *
 *	Arnaldo Carvalho de Melo: get rid of check_region	2001/10/07
 *      
 *      Thorsten Knabe: Compiling with CONFIG_PNP enabled
 *	works again. It is now possible to use more than one 
 *	AD1816 sound card. Sample rate now may be changed during
 *	playback/capture. printk() uses log levels everywhere.
 *	SMP fixes. DMA handling fixes.
 *	Other minor code cleanup.				2003/07/15
 *
 */


#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/isapnp.h>
#include <linux/stddef.h>
#include <linux/spinlock.h>
#include "sound_config.h"

#define DEBUGNOISE(x)

#define CHECK_FOR_POWER { int timeout=100; \
  while (timeout > 0 && (inb(devc->base)&0x80)!= 0x80) {\
          timeout--; \
  } \
  if (timeout==0) {\
          printk(KERN_WARNING "ad1816: Check for power failed in %s line: %d\n",__FILE__,__LINE__); \
  } \
}

/* structure to hold device specific information */
typedef struct
{
        int            base;          /* set in attach */
	int            irq;
	int            dma_playback;
        int            dma_capture;
  
	int            opened;         /* open */
        int            speed;	
	int            channels;
	int            audio_format;
        int            audio_mode; 
  
        int            recmask;        /* setup */
	unsigned char  format_bits;
	int            supported_devices;
	int            supported_rec_devices;
	unsigned short levels[SOUND_MIXER_NRDEVICES];
					/* misc */
	struct pnp_dev *pnpdev;	 /* configured via pnp */
        int            dev_no;   /* this is the # in audio_devs and NOT 
				    in ad1816_info */
	spinlock_t	lock;  
} ad1816_info;

static int nr_ad1816_devs;
static int ad1816_clockfreq = 33000;
static int options;

/* supported audio formats */
static int  ad_format_mask =
AFMT_U8 | AFMT_S16_LE | AFMT_S16_BE | AFMT_MU_LAW | AFMT_A_LAW;

/* array of device info structures */
static ad1816_info dev_info[MAX_AUDIO_DEV];


/* ------------------------------------------------------------------- */

/* functions for easier access to inderect registers */

static int ad_read (ad1816_info * devc, int reg)
{
	int result;
	
	CHECK_FOR_POWER