/*

   * linux/sound/oss/soundcard.c

   *
   * Sound card driver for Linux
   *
   *
   * 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.
   *
   *
   * Thomas Sailer     : ioctl code reworked (vmalloc/vfree removed)
   *                   integrated sound_switch.c
   * Stefan Reinauer   : integrated /proc/sound (equals to /dev/sndstat,
   *                   which should disappear in the near future)
   * Eric Dumas	     : devfs support (22-Jan-98) <dumas@linux.eu.org> with
   *                   fixups by C. Scott Ananian <cananian@alumni.princeton.edu>
   * Richard Gooch     : moved common (non OSS-specific) devices to sound_core.c
   * Rob Riggs	     : Added persistent DMA buffers support (1998/10/17)
   * Christoph Hellwig : Some cleanup work (2000/03/01)
   */

  
  #include "sound_config.h"
  #include <linux/init.h>
  #include <linux/types.h>
  #include <linux/errno.h>
  #include <linux/signal.h>
  #include <linux/fcntl.h>
  #include <linux/ctype.h>
  #include <linux/stddef.h>
  #include <linux/kmod.h>

  #include <linux/kernel.h>

  #include <asm/dma.h>
  #include <asm/io.h>
  #include <linux/wait.h>

  #include <linux/ioport.h>

  #include <linux/major.h>
  #include <linux/delay.h>
  #include <linux/proc_fs.h>

  #include <linux/mutex.h>

  #include <linux/module.h>

  #include <linux/mm.h>

  #include <linux/device.h>

  
  /*
   * This ought to be moved into include/asm/dma.h
   */
  #ifndef valid_dma
  #define valid_dma(n) ((n) >= 0 && (n) < MAX_DMA_CHANNELS && (n) != 4)
  #endif
  
  /*
   * Table for permanently allocated memory (used when unloading the module)
   */

  void *          sound_mem_blocks[MAX_MEM_BLOCKS];

  static DEFINE_MUTEX(soundcard_mutex);

  int             sound_nblocks = 0;
  
  /* Persistent DMA buffers */
  #ifdef CONFIG_SOUND_DMAP
  int             sound_dmap_flag = 1;
  #else
  int             sound_dmap_flag = 0;
  #endif
  
  static char     dma_alloc_map[MAX_DMA_CHANNELS];
  
  #define DMA_MAP_UNAVAIL		0
  #define DMA_MAP_FREE		1
  #define DMA_MAP_BUSY		2
  
  
  unsigned long seq_time = 0;	/* Time for /dev/sequencer */

  extern struct class *sound_class;

  
  /*
   * Table for configurable mixer volume handling
   */
  static mixer_vol_table mixer_vols[MAX_MIXER_DEV];
  static int num_mixer_volumes;
  
  int *load_mixer_volumes(char *name, int *levels, int present)
  {
  	int             i, n;
  
  	for (i = 0; i < num_mixer_volumes; i++) {

  		if (strncmp(name, mixer_vols[i].name, 32) == 0) {

  			if (present)
  				mixer_vols[i].num = i;
  			return mixer_vols[i].levels;
  		}
  	}
  	if (num_mixer_volumes >= MAX_MIXER_DEV) {
  		printk(KERN_ERR "Sound: Too many mixers (%s)
  ", name);
  		return levels;
  	}
  	n = num_mixer_volumes++;

  	strncpy(mixer_vols[n].name, name, 32);

  
  	if (present)
  		mixer_vols[n].num = n;
  	else
  		mixer_vols[n].num = -1;
  
  	for (i = 0; i < 32; i++)
  		mixer_vols[n].levels[i] = levels[i];
  	return mixer_vols[n].levels;
  }

  EXPORT_SYMBOL(load_mixer_volumes);

  
  static int set_mixer_levels(void __user * arg)
  {
          /* mixer_vol_table is 174 bytes, so IMHO no reason to not allocate it on the stack */
  	mixer_vol_table buf;   
  
  	if (__copy_from_user(&buf, arg, sizeof(buf)))
  		return -EFAULT;
  	load_mixer_volumes(buf.name, buf.levels, 0);
  	if (__copy_to_user(arg, &buf, sizeof(buf)))
  		return -EFAULT;
  	return 0;
  }
  
  static int get_mixer_levels(void __user * arg)
  {
  	int n;
  
  	if (__get_user(n, (int __user *)(&(((mixer_vol_table __user *)arg)->num))))
  		return -EFAULT;
  	if (n < 0 || n >= num_mixer_volumes)
  		return -EINVAL;
  	if (__copy_to_user(arg, &mixer_vols[n], sizeof(mixer_vol_table)))
  		return -EFAULT;
  	return 0;
  }
  
  /* 4K page size but our output routines use some slack for overruns */
  #define PROC_BLOCK_SIZE (3*1024)
  
  static ssize_t sound_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
  {

  	int dev = iminor(file->f_path.dentry->d_inode);

  	int ret = -EINVAL;
  
  	/*
  	 *	The OSS drivers aren't remotely happy without this locking,
  	 *	and unless someone fixes them when they are about to bite the
  	 *	big one anyway, we might as well bandage here..
  	 */
  	 

  	mutex_lock(&soundcard_mutex);

  	
  	DEB(printk("sound_read(dev=%d, count=%d)
  ", dev, count));
  	switch (dev & 0x0f) {
  	case SND_DEV_DSP:
  	case SND_DEV_DSP16:
  	case SND_DEV_AUDIO:
  		ret = audio_read(dev, file, buf, count);
  		break;
  
  	case SND_DEV_SEQ:
  	case SND_DEV_SEQ2:
  		ret = sequencer_read(dev, file, buf, count);
  		break;
  
  	case SND_DEV_MIDIN:
  		ret = MIDIbuf_read(dev, file, buf, count);
  	}

  	mutex_unlock(&soundcard_mutex);

  	return ret;
  }
  
  static ssize_t sound_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
  {

  	int dev = iminor(file->f_path.dentry->d_inode);

  	int ret = -EINVAL;
  	

  	mutex_lock(&soundcard_mutex);

  	DEB(printk("sound_write(dev=%d, count=%d)
  ", dev, count));
  	switch (dev & 0x0f) {
  	case SND_DEV_SEQ:
  	case SND_DEV_SEQ2:
  		ret =  sequencer_write(dev, file, buf, count);
  		break;
  
  	case SND_DEV_DSP:
  	case SND_DEV_DSP16:
  	case SND_DEV_AUDIO:
  		ret = audio_write(dev, file, buf, count);
  		break;
  
  	case SND_DEV_MIDIN:
  		ret =  MIDIbuf_write(dev, file, buf, count);
  		break;
  	}

  	mutex_unlock(&soundcard_mutex);

  	return ret;
  }
  
  static int sound_open(struct inode *inode, struct file *file)
  {
  	int dev = iminor(inode);
  	int retval;
  
  	DEB(printk("sound_open(dev=%d)
  ", dev));
  	if ((dev >= SND_NDEVS) || (dev < 0)) {
  		printk(KERN_ERR "Invalid minor device %d
  ", dev);
  		return -ENXIO;
  	}

  	mutex_lock(&soundcard_mutex);

  	switch (dev & 0x0f) {
  	case SND_DEV_CTL:
  		dev >>= 4;
  		if (dev >= 0 && dev < MAX_MIXER_DEV && mixer_devs[dev] == NULL) {
  			request_module("mixer%d", dev);
  		}

  		retval = -ENXIO;

  		if (dev && (dev >= num_mixers || mixer_devs[dev] == NULL))

  			break;

  	
  		if (!try_module_get(mixer_devs[dev]->owner))

  			break;
  
  		retval = 0;

  		break;
  
  	case SND_DEV_SEQ:
  	case SND_DEV_SEQ2:

  		retval = sequencer_open(dev, file);

  		break;
  
  	case SND_DEV_MIDIN:

  		retval = MIDIbuf_open(dev, file);

  		break;
  
  	case SND_DEV_DSP:
  	case SND_DEV_DSP16:
  	case SND_DEV_AUDIO:

  		retval = audio_open(dev, file);

  		break;
  
  	default:
  		printk(KERN_ERR "Invalid minor device %d
  ", dev);

  		retval = -ENXIO;

  	}

  	mutex_unlock(&soundcard_mutex);

  	return retval;

  }
  
  static int sound_release(struct inode *inode, struct file *file)
  {
  	int dev = iminor(inode);

  	mutex_lock(&soundcard_mutex);

  	DEB(printk("sound_release(dev=%d)
  ", dev));
  	switch (dev & 0x0f) {
  	case SND_DEV_CTL:
  		module_put(mixer_devs[dev >> 4]->owner);
  		break;
  		
  	case SND_DEV_SEQ:
  	case SND_DEV_SEQ2:
  		sequencer_release(dev, file);
  		break;
  
  	case SND_DEV_MIDIN:
  		MIDIbuf_release(dev, file);
  		break;
  
  	case SND_DEV_DSP:
  	case SND_DEV_DSP16:
  	case SND_DEV_AUDIO:
  		audio_release(dev, file);
  		break;
  
  	default:
  		printk(KERN_ERR "Sound error: Releasing unknown device 0x%02x
  ", dev);
  	}

  	mutex_unlock(&soundcard_mutex);

  
  	return 0;
  }
  
  static int get_mixer_info(int dev, void __user *arg)
  {
  	mixer_info info;
  	memset(&info, 0, sizeof(info));
  	strlcpy(info.id, mixer_devs[dev]->id, sizeof(info.id));
  	strlcpy(info.name, mixer_devs[dev]->name, sizeof(info.name));
  	info.modify_counter = mixer_devs[dev]->modify_counter;
  	if (__copy_to_user(arg, &info,  sizeof(info)))
  		return -EFAULT;
  	return 0;
  }
  
  static int get_old_mixer_info(int dev, void __user *arg)
  {
  	_old_mixer_info info;
  	memset(&info, 0, sizeof(info));
   	strlcpy(info.id, mixer_devs[dev]->id, sizeof(info.id));
   	strlcpy(info.name, mixer_devs[dev]->name, sizeof(info.name));
   	if (copy_to_user(arg, &info,  sizeof(info)))
  		return -EFAULT;
  	return 0;
  }
  
  static int sound_mixer_ioctl(int mixdev, unsigned int cmd, void __user *arg)
  {
   	if (mixdev < 0 || mixdev >= MAX_MIXER_DEV)
   		return -ENXIO;
   	/* Try to load the mixer... */
   	if (mixer_devs[mixdev] == NULL) {
   		request_module("mixer%d", mixdev);
   	}
   	if (mixdev >= num_mixers || !mixer_devs[mixdev])
   		return -ENXIO;
  	if (cmd == SOUND_MIXER_INFO)
  		return get_mixer_info(mixdev, arg);
  	if (cmd == SOUND_OLD_MIXER_INFO)
  		return get_old_mixer_info(mixdev, arg);
  	if (_SIOC_DIR(cmd) & _SIOC_WRITE)
  		mixer_devs[mixdev]->modify_counter++;
  	if (!mixer_devs[mixdev]->ioctl)
  		return -EINVAL;
  	return mixer_devs[mixdev]->ioctl(mixdev, cmd, arg);
  }

  static long sound_ioctl(struct file *file, unsigned int cmd, unsigned long arg)

  {
  	int len = 0, dtype;

  	int dev = iminor(file->f_dentry->d_inode);
  	long ret = -EINVAL;

  	void __user *p = (void __user *)arg;
  
  	if (_SIOC_DIR(cmd) != _SIOC_NONE && _SIOC_DIR(cmd) != 0) {
  		/*
  		 * Have to validate the address given by the process.
  		 */
  		len = _SIOC_SIZE(cmd);
  		if (len < 1 || len > 65536 || !p)
  			return -EFAULT;
  		if (_SIOC_DIR(cmd) & _SIOC_WRITE)
  			if (!access_ok(VERIFY_READ, p, len))
  				return -EFAULT;
  		if (_SIOC_DIR(cmd) & _SIOC_READ)
  			if (!access_ok(VERIFY_WRITE, p, len))
  				return -EFAULT;
  	}
  	DEB(printk("sound_ioctl(dev=%d, cmd=0x%x, arg=0x%x)
  ", dev, cmd, arg));
  	if (cmd == OSS_GETVERSION)
  		return __put_user(SOUND_VERSION, (int __user *)p);
  	

  	mutex_lock(&soundcard_mutex);

  	if (_IOC_TYPE(cmd) == 'M' && num_mixers > 0 &&   /* Mixer ioctl */
  	    (dev & 0x0f) != SND_DEV_CTL) {              
  		dtype = dev & 0x0f;
  		switch (dtype) {
  		case SND_DEV_DSP:
  		case SND_DEV_DSP16:
  		case SND_DEV_AUDIO:

  			ret = sound_mixer_ioctl(audio_devs[dev >> 4]->mixer_dev,

  						 cmd, p);

  			break;			

  		default:

  			ret = sound_mixer_ioctl(dev >> 4, cmd, p);
  			break;

  		}

  		mutex_unlock(&soundcard_mutex);

  		return ret;

  	}

  	switch (dev & 0x0f) {
  	case SND_DEV_CTL:
  		if (cmd == SOUND_MIXER_GETLEVELS)

  			ret = get_mixer_levels(p);
  		else if (cmd == SOUND_MIXER_SETLEVELS)
  			ret = set_mixer_levels(p);
  		else
  			ret = sound_mixer_ioctl(dev >> 4, cmd, p);
  		break;

  
  	case SND_DEV_SEQ:
  	case SND_DEV_SEQ2:

  		ret = sequencer_ioctl(dev, file, cmd, p);
  		break;

  
  	case SND_DEV_DSP:
  	case SND_DEV_DSP16:
  	case SND_DEV_AUDIO:

  		ret = audio_ioctl(dev, file, cmd, p);

  		break;
  
  	case SND_DEV_MIDIN:

  		ret = MIDIbuf_ioctl(dev, file, cmd, p);

  		break;
  
  	}

  	mutex_unlock(&soundcard_mutex);

  	return ret;

  }
  
  static unsigned int sound_poll(struct file *file, poll_table * wait)
  {

  	struct inode *inode = file->f_path.dentry->d_inode;

  	int dev = iminor(inode);
  
  	DEB(printk("sound_poll(dev=%d)
  ", dev));
  	switch (dev & 0x0f) {
  	case SND_DEV_SEQ:
  	case SND_DEV_SEQ2:
  		return sequencer_poll(dev, file, wait);
  
  	case SND_DEV_MIDIN:
  		return MIDIbuf_poll(dev, file, wait);
  
  	case SND_DEV_DSP:
  	case SND_DEV_DSP16:
  	case SND_DEV_AUDIO:
  		return DMAbuf_poll(file, dev >> 4, wait);
  	}
  	return 0;
  }
  
  static int sound_mmap(struct file *file, struct vm_area_struct *vma)
  {
  	int dev_class;
  	unsigned long size;
  	struct dma_buffparms *dmap = NULL;

  	int dev = iminor(file->f_path.dentry->d_inode);

  
  	dev_class = dev & 0x0f;
  	dev >>= 4;
  
  	if (dev_class != SND_DEV_DSP && dev_class != SND_DEV_DSP16 && dev_class != SND_DEV_AUDIO) {
  		printk(KERN_ERR "Sound: mmap() not supported for other than audio devices
  ");
  		return -EINVAL;
  	}

  	mutex_lock(&soundcard_mutex);

  	if (vma->vm_flags & VM_WRITE)	/* Map write and read/write to the output buf */
  		dmap = audio_devs[dev]->dmap_out;
  	else if (vma->vm_flags & VM_READ)
  		dmap = audio_devs[dev]->dmap_in;
  	else {
  		printk(KERN_ERR "Sound: Undefined mmap() access
  ");

  		mutex_unlock(&soundcard_mutex);

  		return -EINVAL;
  	}
  
  	if (dmap == NULL) {
  		printk(KERN_ERR "Sound: mmap() error. dmap == NULL
  ");

  		mutex_unlock(&soundcard_mutex);

  		return -EIO;
  	}
  	if (dmap->raw_buf == NULL) {
  		printk(KERN_ERR "Sound: mmap() called when raw_buf == NULL
  ");

  		mutex_unlock(&soundcard_mutex);

  		return -EIO;
  	}
  	if (dmap->mapping_flags) {
  		printk(KERN_ERR "Sound: mmap() called twice for the same DMA buffer
  ");

  		mutex_unlock(&soundcard_mutex);

  		return -EIO;
  	}
  	if (vma->vm_pgoff != 0) {
  		printk(KERN_ERR "Sound: mmap() offset must be 0.
  ");

  		mutex_unlock(&soundcard_mutex);

  		return -EINVAL;
  	}
  	size = vma->vm_end - vma->vm_start;
  
  	if (size != dmap->bytes_in_use) {
  		printk(KERN_WARNING "Sound: mmap() size = %ld. Should be %d
  ", size, dmap->bytes_in_use);
  	}
  	if (remap_pfn_range(vma, vma->vm_start,
  			virt_to_phys(dmap->raw_buf) >> PAGE_SHIFT,
  			vma->vm_end - vma->vm_start, vma->vm_page_prot)) {

  		mutex_unlock(&soundcard_mutex);

  		return -EAGAIN;
  	}
  
  	dmap->mapping_flags |= DMA_MAP_MAPPED;
  
  	if( audio_devs[dev]->d->mmap)
  		audio_devs[dev]->d->mmap(dev);
  
  	memset(dmap->raw_buf,
  	       dmap->neutral_byte,
  	       dmap->bytes_in_use);

  	mutex_unlock(&soundcard_mutex);

  	return 0;
  }

  const struct file_operations oss_sound_fops = {

  	.owner		= THIS_MODULE,
  	.llseek		= no_llseek,
  	.read		= sound_read,
  	.write		= sound_write,
  	.poll		= sound_poll,

  	.unlocked_ioctl	= sound_ioctl,

  	.mmap		= sound_mmap,
  	.open		= sound_open,
  	.release	= sound_release,
  };
  
  /*
   *	Create the required special subdevices
   */
   
  static int create_special_devices(void)
  {
  	int seq1,seq2;
  	seq1=register_sound_special(&oss_sound_fops, 1);
  	if(seq1==-1)
  		goto bad;
  	seq2=register_sound_special(&oss_sound_fops, 8);
  	if(seq2!=-1)
  		return 0;
  	unregister_sound_special(1);
  bad:
  	return -1;
  }

  static int dmabuf;
  static int dmabug;
  
  module_param(dmabuf, int, 0444);
  module_param(dmabug, int, 0444);

  /* additional minors for compatibility */
  struct oss_minor_dev {
  	unsigned short minor;
  	unsigned int enabled;
  } dev_list[] = {
  	{ SND_DEV_DSP16 },
  	{ SND_DEV_AUDIO },
  };

  static int __init oss_init(void)
  {
  	int             err;
  	int i, j;
  	

  #ifdef CONFIG_PCI
  	if(dmabug)
  		isa_dma_bridge_buggy = dmabug;
  #endif
  
  	err = create_special_devices();
  	if (err) {
  		printk(KERN_ERR "sound: driver already loaded/included in kernel
  ");
  		return err;
  	}
  
  	/* Protecting the innocent */
  	sound_dmap_flag = (dmabuf > 0 ? 1 : 0);

  	for (i = 0; i < ARRAY_SIZE(dev_list); i++) {

  		j = 0;
  		do {
  			unsigned short minor = dev_list[i].minor + j * 0x10;
  			if (!register_sound_special(&oss_sound_fops, minor))
  				dev_list[i].enabled = (1 << j);
  		} while (++j < num_audiodevs);

  	}

  	if (sound_nblocks >= MAX_MEM_BLOCKS - 1)

  		printk(KERN_ERR "Sound warning: Deallocation table was too small.
  ");
  	
  	return 0;
  }
  
  static void __exit oss_cleanup(void)
  {
  	int i, j;

  	for (i = 0; i < ARRAY_SIZE(dev_list); i++) {

  		j = 0;
  		do {
  			if (dev_list[i].enabled & (1 << j))
  				unregister_sound_special(dev_list[i].minor);
  		} while (++j < num_audiodevs);

  	}
  	
  	unregister_sound_special(1);
  	unregister_sound_special(8);
  
  	sound_stop_timer();
  
  	sequencer_unload();
  
  	for (i = 0; i < MAX_DMA_CHANNELS; i++)
  		if (dma_alloc_map[i] != DMA_MAP_UNAVAIL) {
  			printk(KERN_ERR "Sound: Hmm, DMA%d was left allocated - fixed
  ", i);
  			sound_free_dma(i);
  		}
  
  	for (i = 0; i < sound_nblocks; i++)
  		vfree(sound_mem_blocks[i]);
  
  }
  
  module_init(oss_init);
  module_exit(oss_cleanup);
  MODULE_LICENSE("GPL");

  MODULE_DESCRIPTION("OSS Sound subsystem");
  MODULE_AUTHOR("Hannu Savolainen, et al.");

  
  
  int sound_alloc_dma(int chn, char *deviceID)
  {
  	int err;
  
  	if ((err = request_dma(chn, deviceID)) != 0)
  		return err;
  
  	dma_alloc_map[chn] = DMA_MAP_FREE;
  
  	return 0;
  }

  EXPORT_SYMBOL(sound_alloc_dma);

  
  int sound_open_dma(int chn, char *deviceID)
  {
  	if (!valid_dma(chn)) {
  		printk(KERN_ERR "sound_open_dma: Invalid DMA channel %d
  ", chn);
  		return 1;
  	}
  
  	if (dma_alloc_map[chn] != DMA_MAP_FREE) {
  		printk("sound_open_dma: DMA channel %d busy or not allocated (%d)
  ", chn, dma_alloc_map[chn]);
  		return 1;
  	}
  	dma_alloc_map[chn] = DMA_MAP_BUSY;
  	return 0;
  }

  EXPORT_SYMBOL(sound_open_dma);

  
  void sound_free_dma(int chn)
  {
  	if (dma_alloc_map[chn] == DMA_MAP_UNAVAIL) {
  		/* printk( "sound_free_dma: Bad access to DMA channel %d
  ",  chn); */
  		return;
  	}
  	free_dma(chn);
  	dma_alloc_map[chn] = DMA_MAP_UNAVAIL;
  }

  EXPORT_SYMBOL(sound_free_dma);

  
  void sound_close_dma(int chn)
  {
  	if (dma_alloc_map[chn] != DMA_MAP_BUSY) {
  		printk(KERN_ERR "sound_close_dma: Bad access to DMA channel %d
  ", chn);
  		return;
  	}
  	dma_alloc_map[chn] = DMA_MAP_FREE;
  }

  EXPORT_SYMBOL(sound_close_dma);

  
  static void do_sequencer_timer(unsigned long dummy)
  {
  	sequencer_timer(0);
  }

  static DEFINE_TIMER(seq_timer, do_sequencer_timer, 0, 0);

  
  void request_sound_timer(int count)
  {
  	extern unsigned long seq_time;
  
  	if (count < 0) {
  		seq_timer.expires = (-count) + jiffies;
  		add_timer(&seq_timer);
  		return;
  	}
  	count += seq_time;
  
  	count -= jiffies;
  
  	if (count < 1)
  		count = 1;
  
  	seq_timer.expires = (count) + jiffies;
  	add_timer(&seq_timer);
  }
  
  void sound_stop_timer(void)
  {
  	del_timer(&seq_timer);
  }
  
  void conf_printf(char *name, struct address_info *hw_config)
  {
  #ifndef CONFIG_SOUND_TRACEINIT
  	return;
  #else
  	printk("<%s> at 0x%03x", name, hw_config->io_base);
  
  	if (hw_config->irq)
  		printk(" irq %d", (hw_config->irq > 0) ? hw_config->irq : -hw_config->irq);
  
  	if (hw_config->dma != -1 || hw_config->dma2 != -1)
  	{
  		printk(" dma %d", hw_config->dma);
  		if (hw_config->dma2 != -1)
  			printk(",%d", hw_config->dma2);
  	}
  	printk("
  ");
  #endif
  }

  EXPORT_SYMBOL(conf_printf);

  
  void conf_printf2(char *name, int base, int irq, int dma, int dma2)
  {
  #ifndef CONFIG_SOUND_TRACEINIT
  	return;
  #else
  	printk("<%s> at 0x%03x", name, base);
  
  	if (irq)
  		printk(" irq %d", (irq > 0) ? irq : -irq);
  
  	if (dma != -1 || dma2 != -1)
  	{
  		  printk(" dma %d", dma);
  		  if (dma2 != -1)
  			  printk(",%d", dma2);
  	}
  	printk("
  ");
  #endif
  }

  EXPORT_SYMBOL(conf_printf2);