/*
 * drivers/sbus/audio/dummy.c
 *
 * Copyright 1998 Derrick J Brashear (shadow@andrew.cmu.edu)
 *
 * This is a dummy lowlevel driver. Consider it a distant cousin of 
 * /proc/audio; It pretends to be a piece of audio hardware, and writes
 * to a file instead. (or will shortly)
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/malloc.h>
#include <linux/init.h>
#include <linux/soundcard.h>
#include <linux/delay.h>
#include <asm/openprom.h>
#include <asm/oplib.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/sbus.h>

#include <asm/audioio.h>
#include "dummy.h"

#define MAX_DRIVERS 1
static struct sparcaudio_driver drivers[MAX_DRIVERS];
static int num_drivers;

static int dummy_play_gain(struct sparcaudio_driver *drv, int value, 
                            unsigned char balance);
static int dummy_record_gain(struct sparcaudio_driver *drv, int value, 
                            unsigned char balance);
static int dummy_output_muted(struct sparcaudio_driver *drv, int value);
static int dummy_attach(struct sparcaudio_driver *drv);

static int
dummy_set_output_encoding(struct sparcaudio_driver *drv, int value)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  if (value != 0) {
    dummy_chip->perchip_info.play.encoding = value;
    return 0;
  }
  return -EINVAL;
}

static int
dummy_set_input_encoding(struct sparcaudio_driver *drv, int value)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  if (value != 0) {
    dummy_chip->perchip_info.record.encoding = value;
    return 0;
  }
  return -EINVAL;
}

static int dummy_get_output_encoding(struct sparcaudio_driver *drv)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  return dummy_chip->perchip_info.play.encoding;
}

static int dummy_get_input_encoding(struct sparcaudio_driver *drv)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  return dummy_chip->perchip_info.record.encoding;
}

static int
dummy_set_output_rate(struct sparcaudio_driver *drv, int value)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  if (value != 0) {
    dummy_chip->perchip_info.play.sample_rate = value;
    return 0;
  }
  return -EINVAL;
}

static int
dummy_set_input_rate(struct sparcaudio_driver *drv, int value)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  if (value != 0) {
    dummy_chip->perchip_info.record.sample_rate = value;
    return 0;
  }
  return -EINVAL;
}

static int dummy_get_output_rate(struct sparcaudio_driver *drv)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  return dummy_chip->perchip_info.play.sample_rate;
}

static int dummy_get_input_rate(struct sparcaudio_driver *drv)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  return dummy_chip->perchip_info.record.sample_rate;
}

/* Generically we support 4 channels. This does 2 */
static int
dummy_set_output_channels(struct sparcaudio_driver *drv, int value)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  switch (value) {
  case 1:
  case 2:
    break;
  default:
    return -(EINVAL);
  }  
  dummy_chip->perchip_info.play.channels = value;
  return 0;
}

/* Generically we support 4 channels. This does 2 */
static int
dummy_set_input_channels(struct sparcaudio_driver *drv, int value)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  switch (value) {
  case 1:
  case 2:
    break;
  default:
    return -(EINVAL);
  }  
  dummy_chip->perchip_info.record.channels = value;
  return 0;
}

static int dummy_get_input_channels(struct sparcaudio_driver *drv)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  return dummy_chip->perchip_info.record.channels;
}

static int dummy_get_output_channels(struct sparcaudio_driver *drv)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  return dummy_chip->perchip_info.play.channels;
}

static int dummy_get_output_precision(struct sparcaudio_driver *drv)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  return dummy_chip->perchip_info.play.precision;
}

static int dummy_get_input_precision(struct sparcaudio_driver *drv)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  return dummy_chip->perchip_info.record.precision;
}

static int dummy_set_output_precision(struct sparcaudio_driver *drv, int val)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private; 
  dummy_chip->perchip_info.play.precision = val;
  return dummy_chip->perchip_info.play.precision;
}

static int dummy_set_input_precision(struct sparcaudio_driver *drv, int val)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private; 
  dummy_chip->perchip_info.record.precision = val;
  return dummy_chip->perchip_info.record.precision;
}

/* Set output mute */
static int dummy_output_muted(struct sparcaudio_driver *drv, int value)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  if (!value) 
    dummy_chip->perchip_info.output_muted = 0;
  else
    dummy_chip->perchip_info.output_muted = 1;
  return 0;
}

static int dummy_get_output_muted(struct sparcaudio_driver *drv)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  return dummy_chip->perchip_info.output_muted;
}

static int dummy_get_formats(struct sparcaudio_driver *drv)
{
  return (AFMT_MU_LAW | AFMT_A_LAW | AFMT_U8 | AFMT_IMA_ADPCM | 
          AFMT_S16_LE | AFMT_S16_BE);
}

static int dummy_get_output_ports(struct sparcaudio_driver *drv)
{
  return (AUDIO_LINE_OUT | AUDIO_SPEAKER | AUDIO_HEADPHONE);
}

static int dummy_get_input_ports(struct sparcaudio_driver *drv)
{
  return (AUDIO_ANALOG_LOOPBACK);
}

/* Set chip "output" port */
static int dummy_set_output_port(struct sparcaudio_driver *drv, int value)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  dummy_chip->perchip_info.play.port = value;
  return (value);
}

static int dummy_set_input_port(struct sparcaudio_driver *drv, int value)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  dummy_chip->perchip_info.record.port = value;
  return (value);
}

static int dummy_get_output_port(struct sparcaudio_driver *drv)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  return dummy_chip->perchip_info.play.port;
}

static int dummy_get_input_port(struct sparcaudio_driver *drv)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  return dummy_chip->perchip_info.record.port;
}

static int dummy_get_output_error(struct sparcaudio_driver *drv)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  return (int)dummy_chip->perchip_info.play.error;
}

static int dummy_get_input_error(struct sparcaudio_driver *drv)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  return (int)dummy_chip->perchip_info.record.error;
}

static int dummy_get_output_samples(struct sparcaudio_driver *drv)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  return dummy_chip->perchip_info.play.samples;
}

static int dummy_get_output_pause(struct sparcaudio_driver *drv)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  return (int)dummy_chip->perchip_info.play.pause;
}

static int dummy_set_output_volume(struct sparcaudio_driver *drv, int value)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  dummy_play_gain(drv, value, dummy_chip->perchip_info.play.balance);
  return 0;
}

static int dummy_get_output_volume(struct sparcaudio_driver *drv)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  return dummy_chip->perchip_info.play.gain;
}

static int dummy_set_output_balance(struct sparcaudio_driver *drv, int value)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  dummy_chip->perchip_info.play.balance = value;
  dummy_play_gain(drv, dummy_chip->perchip_info.play.gain, 
                  dummy_chip->perchip_info.play.balance);
  return 0;
}

static int dummy_get_output_balance(struct sparcaudio_driver *drv)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  return (int)dummy_chip->perchip_info.play.balance;
}

/* Set chip play gain */
static int dummy_play_gain(struct sparcaudio_driver *drv, int value, unsigned char balance)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  int tmp = 0, r, l, r_adj, l_adj;
  r = l = value;
  if (balance < AUDIO_MID_BALANCE) {
    r = (int)(value - ((AUDIO_MID_BALANCE - balance) << AUDIO_BALANCE_SHIFT));
    if (r < 0) r = 0;
  } else if (balance > AUDIO_MID_BALANCE) {
    l = (int)(value - ((balance - AUDIO_MID_BALANCE) << AUDIO_BALANCE_SHIFT));
    if (l < 0) l = 0;
  }
  (l == 0) ? (l_adj = DUMMY_MAX_DEV_ATEN) : (l_adj = DUMMY_MAX_ATEN - 
                                             (l * (DUMMY_MAX_ATEN + 1) / 
                                              (AUDIO_MAX_GAIN + 1)));
  (r == 0) ? (r_adj = DUMMY_MAX_DEV_ATEN) : (r_adj = DUMMY_MAX_ATEN -
                                             (r * (DUMMY_MAX_ATEN + 1) /
                                              (AUDIO_MAX_GAIN + 1)));
  if ((value == 0) || (value == AUDIO_MAX_GAIN)) {
    tmp = value;
  } else {
    if (value == l)
      tmp = ((DUMMY_MAX_ATEN - l_adj) * (AUDIO_MAX_GAIN + 1) / 
             (DUMMY_MAX_ATEN + 1));
    else if (value == r)
      tmp = ((DUMMY_MAX_ATEN - r_adj) * (AUDIO_MAX_GAIN + 1) / 
             (DUMMY_MAX_ATEN + 1));
  }
  dummy_chip->perchip_info.play.gain = tmp;
  return 0;
}

static int dummy_get_input_samples(struct sparcaudio_driver *drv)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  return dummy_chip->perchip_info.record.samples;
}

static int dummy_get_input_pause(struct sparcaudio_driver *drv)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  return (int)dummy_chip->perchip_info.record.pause;
}

static int dummy_set_monitor_volume(struct sparcaudio_driver *drv, int value)
{
  return 0;
}

static int dummy_get_monitor_volume(struct sparcaudio_driver *drv)
{
  return 0;
}

static int dummy_set_input_volume(struct sparcaudio_driver *drv, int value)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  dummy_record_gain(drv, value, dummy_chip->perchip_info.record.balance);
  return 0;
}

static int dummy_get_input_volume(struct sparcaudio_driver *drv)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  return dummy_chip->perchip_info.record.gain;
}

static int dummy_set_input_balance(struct sparcaudio_driver *drv, int value)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  dummy_chip->perchip_info.record.balance = value;
  dummy_record_gain(drv, dummy_chip->perchip_info.record.gain, 
                  dummy_chip->perchip_info.play.balance);
  return 0;
}

static int dummy_get_input_balance(struct sparcaudio_driver *drv)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  return (int)dummy_chip->perchip_info.record.balance;
}

static int dummy_record_gain(struct sparcaudio_driver *drv, int value, unsigned char balance)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  int tmp = 0, r, l, r_adj, l_adj;
  r = l = value;
  if (balance < AUDIO_MID_BALANCE) {
    r = (int)(value - ((AUDIO_MID_BALANCE - balance) << AUDIO_BALANCE_SHIFT));
    if (r < 0) r = 0;
  } else if (balance > AUDIO_MID_BALANCE) {
    l = (int)(value - ((balance - AUDIO_MID_BALANCE) << AUDIO_BALANCE_SHIFT));
    if (l < 0) l = 0;
  }
  (l == 0) ? (l_adj = DUMMY_MAX_DEV_ATEN) : (l_adj = DUMMY_MAX_ATEN - 
                                             (l * (DUMMY_MAX_ATEN + 1) / 
                                              (AUDIO_MAX_GAIN + 1)));
  (r == 0) ? (r_adj = DUMMY_MAX_DEV_ATEN) : (r_adj = DUMMY_MAX_ATEN -
                                             (r * (DUMMY_MAX_ATEN + 1) /
                                              (AUDIO_MAX_GAIN + 1)));
  if ((value == 0) || (value == AUDIO_MAX_GAIN)) {
    tmp = value;
  } else {
    if (value == l)
      tmp = ((DUMMY_MAX_ATEN - l_adj) * (AUDIO_MAX_GAIN + 1) / 
             (DUMMY_MAX_ATEN + 1));
    else if (value == r)
      tmp = ((DUMMY_MAX_ATEN - r_adj) * (AUDIO_MAX_GAIN + 1) / 
             (DUMMY_MAX_ATEN + 1));
  }
  dummy_chip->perchip_info.record.gain = tmp;
  return 0;
}

/* Reset the audio chip to a sane state. */
static void dummy_chip_reset(struct sparcaudio_driver *drv)
{
  dummy_set_output_encoding(drv, AUDIO_ENCODING_ULAW);
  dummy_set_output_rate(drv, DUMMY_RATE);
  dummy_set_output_channels(drv, DUMMY_CHANNELS);
  dummy_set_output_precision(drv, DUMMY_PRECISION);
  dummy_set_output_balance(drv, AUDIO_MID_BALANCE);
  dummy_set_output_volume(drv, DUMMY_DEFAULT_PLAYGAIN);
  dummy_set_output_port(drv, AUDIO_SPEAKER);
  dummy_output_muted(drv, 0);
  dummy_set_input_encoding(drv, AUDIO_ENCODING_ULAW);
  dummy_set_input_rate(drv, DUMMY_RATE);
  dummy_set_input_channels(drv, DUMMY_CHANNELS);
  dummy_set_input_precision(drv, DUMMY_PRECISION);
  dummy_set_input_balance(drv, AUDIO_MID_BALANCE);
  dummy_set_input_volume(drv, DUMMY_DEFAULT_PLAYGAIN);
  dummy_set_input_port(drv, AUDIO_SPEAKER);
}

static int dummy_open(struct inode * inode, struct file * file, struct sparcaudio_driver *drv)
{	
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  /* Set the default audio parameters if not already in use. */
  if (file->f_mode & FMODE_WRITE) {
    if (!(drv->flags & SDF_OPEN_WRITE) && 
	(dummy_chip->perchip_info.play.active == 0)) {
      dummy_chip->perchip_info.play.open = 1;
      dummy_chip->perchip_info.play.samples =
        dummy_chip->perchip_info.play.error = 0;
    }
  }
  if (file->f_mode & FMODE_READ) {
    if (!(drv->flags & SDF_OPEN_READ) && 
	(dummy_chip->perchip_info.record.active == 0)) {
      dummy_chip->perchip_info.record.open = 1;
      dummy_chip->perchip_info.record.samples =
        dummy_chip->perchip_info.record.error = 0;
    }
  }

  MOD_INC_USE_COUNT;

  return 0;
}

static void dummy_release(struct inode * inode, struct file * file, struct sparcaudio_driver *drv)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  if (file->f_mode & FMODE_WRITE) {
    dummy_chip->perchip_info.play.active =
      dummy_chip->perchip_info.play.open = 0;
  }
  if (file->f_mode & FMODE_READ) {
    dummy_chip->perchip_info.record.active =
      dummy_chip->perchip_info.record.open = 0;
  }
  MOD_DEC_USE_COUNT;
}

static void dummy_output_done_task(void * arg)
{
  struct sparcaudio_driver *drv = (struct sparcaudio_driver *)arg;
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;

  sparcaudio_output_done(drv, 1);
  if (dummy_chip->perchip_info.record.active)
    sparcaudio_input_done(drv, 1);
}

static void dummy_start_output(struct sparcaudio_driver *drv, __u8 * buffer,
                                unsigned long count)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;

  if (dummy_chip->perchip_info.play.pause || !count) 
    return;

  dummy_chip->perchip_info.play.active = 1;

  /* fake an "interrupt" to deal with this block */
  dummy_chip->tqueue.next = NULL;
  dummy_chip->tqueue.sync = 0;
  dummy_chip->tqueue.routine = dummy_output_done_task;
  dummy_chip->tqueue.data = drv;

  queue_task(&dummy_chip->tqueue, &tq_immediate);
  mark_bh(IMMEDIATE_BH);
}

static void dummy_start_input(struct sparcaudio_driver *drv, __u8 * buffer,
                                unsigned long count)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  dummy_chip->perchip_info.record.active = 1;
}

static void dummy_stop_output(struct sparcaudio_driver *drv)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  dummy_chip->perchip_info.play.active = 0;
}

static void dummy_stop_input(struct sparcaudio_driver *drv)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  dummy_chip->perchip_info.record.active = 0;
}

static int dummy_set_output_pause(struct sparcaudio_driver *drv, int value)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  dummy_chip->perchip_info.play.pause = value;

  if (!value)
    sparcaudio_output_done(drv, 0);

  return value;
}

static int dummy_set_input_pause(struct sparcaudio_driver *drv, int value)
{
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  dummy_chip->perchip_info.record.pause = value;

  /* This should probably cause play pause. */

  return value;
}

static int dummy_set_input_error(struct sparcaudio_driver *drv, int value)
{
  return 0;
}

static int dummy_set_output_error(struct sparcaudio_driver *drv, int value)
{
  int i;
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  i = dummy_chip->perchip_info.play.error;
  dummy_chip->perchip_info.play.error = value;
  return i;
}

static int dummy_set_output_samples(struct sparcaudio_driver *drv, int value)
{
  int i;
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  i = dummy_chip->perchip_info.play.samples;
  dummy_chip->perchip_info.play.samples = value;
  return i;
}

static int dummy_set_input_samples(struct sparcaudio_driver *drv, int value)
{
  int i;
  struct dummy_chip *dummy_chip = (struct dummy_chip *)drv->private;
  i = dummy_chip->perchip_info.play.samples;
  dummy_chip->perchip_info.record.samples = value;
  return i;
}

/* In order to fake things which care out, play we're a 4231 */
static void dummy_audio_getdev(struct sparcaudio_driver *drv,
                                 audio_device_t * audinfo)
{
  strncpy(audinfo->name, "SUNW,cs4231", sizeof(audinfo->name) - 1);
  strncpy(audinfo->version, "a", sizeof(audinfo->version) - 1);
  strncpy(audinfo->config, "onboard1", sizeof(audinfo->config) - 1);
}


static int dummy_audio_getdev_sunos(struct sparcaudio_driver *drv)
{
  return (5); 
}

static struct sparcaudio_operations dummy_ops = {
	dummy_open,
	dummy_release,
	NULL,
	dummy_start_output,
	dummy_stop_output,
	dummy_start_input,
	dummy_stop_input,
	dummy_audio_getdev,
        dummy_set_output_volume,
        dummy_get_output_volume,
        dummy_set_input_volume,
        dummy_get_input_volume,
        dummy_set_monitor_volume,
        dummy_get_monitor_volume,
	dummy_set_output_balance,
	dummy_get_output_balance,
	dummy_set_input_balance,
	dummy_get_input_balance,
        dummy_set_output_channels,
        dummy_get_output_channels,
        dummy_set_input_channels,
        dummy_get_input_channels,
        dummy_set_output_precision,
        dummy_get_output_precision,
        dummy_set_input_precision,
        dummy_get_input_precision,
        dummy_set_output_port,
        dummy_get_output_port,
        dummy_set_input_port,
        dummy_get_input_port,
        dummy_set_output_encoding,
        dummy_get_output_encoding,
        dummy_set_input_encoding,
        dummy_get_input_encoding,
        dummy_set_output_rate,
        dummy_get_output_rate,
        dummy_set_input_rate,
        dummy_get_input_rate,
	dummy_audio_getdev_sunos,
	dummy_get_output_ports,
	dummy_get_input_ports,
	dummy_output_muted,
	dummy_get_output_muted,
	dummy_set_output_pause,
	dummy_get_output_pause,
        dummy_set_input_pause,
	dummy_get_input_pause,
	dummy_set_output_samples,
	dummy_get_output_samples,
        dummy_set_input_samples,
	dummy_get_input_samples,
	dummy_set_output_error,
	dummy_get_output_error,
        dummy_set_input_error,
	dummy_get_input_error,
        dummy_get_formats,
};

/* Probe for the dummy chip and then attach the driver. */
#ifdef MODULE
int init_module(void)
#else
__initfunc(int dummy_init(void))
#endif
{
  num_drivers = 0;
      
  /* Add support here for specifying multiple dummies to attach at once. */
  if (dummy_attach(&drivers[num_drivers]) == 0)
    num_drivers++;
  
  /* Only return success if we found some dummy chips. */
  return (num_drivers > 0) ? 0 : -EIO;
}

/* Attach to an dummy chip given its PROM node. */
static int dummy_attach(struct sparcaudio_driver *drv)
{
  struct dummy_chip *dummy_chip;
  int err;

  /* Allocate our private information structure. */
  drv->private = kmalloc(sizeof(struct dummy_chip), GFP_KERNEL);
  if (!drv->private)
    return -ENOMEM;

  /* Point at the information structure and initialize it. */
  drv->ops = &dummy_ops;
  dummy_chip = (struct dummy_chip *)drv->private;

  /* Reset parameters. */
  dummy_chip_reset(drv);

  /* Register ourselves with the midlevel audio driver. */
  err = register_sparcaudio_driver(drv, 2);

  if (err < 0) {
    printk(KERN_ERR "dummy: unable to register\n");
    kfree(drv->private);
    return -EIO;
  }

  dummy_chip->perchip_info.play.active = 
    dummy_chip->perchip_info.play.pause = 0;

  dummy_chip->perchip_info.play.avail_ports = (AUDIO_HEADPHONE |
						AUDIO_SPEAKER |
						AUDIO_LINE_OUT);

  /* Announce the hardware to the user. */
  printk(KERN_INFO "audio%d: dummy at 0x0 irq 0\n", drv->index);
  
  /* Success! */
  return 0;
}

#ifdef MODULE
/* Detach from an dummy chip given the device structure. */
static void dummy_detach(struct sparcaudio_driver *drv)
{
  unregister_sparcaudio_driver(drv, 2);
  kfree(drv->private);
}

void cleanup_module(void)
{
  register int i;

  for (i = 0; i < num_drivers; i++) {
    dummy_detach(&drivers[i]);
    num_drivers--;
  }
}
#endif

/*
 * Overrides for Emacs so that we follow Linus's tabbing style.
 * Emacs will notice this stuff at the end of the file and automatically
 * adjust the settings for this buffer only.  This must remain at the end
 * of the file.
 * ---------------------------------------------------------------------------
 * Local variables:
 * c-indent-level: 4
 * c-brace-imaginary-offset: 0
 * c-brace-offset: -4
 * c-argdecl-indent: 4
 * c-label-offset: -4
 * c-continued-statement-offset: 4
 * c-continued-brace-offset: 0
 * indent-tabs-mode: nil
 * tab-width: 8
 * End:
 */