/*
   *  Digital Audio (PCM) abstract layer / OSS compatible

   *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>

   *
   *
   *   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., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
   *
   */
  
  #if 0
  #define PLUGIN_DEBUG
  #endif
  #if 0
  #define OSS_DEBUG
  #endif

  #include <linux/init.h>

  #include <linux/slab.h>
  #include <linux/time.h>
  #include <linux/vmalloc.h>

  #include <linux/module.h>

  #include <linux/math64.h>

  #include <linux/string.h>

  #include <sound/core.h>
  #include <sound/minors.h>
  #include <sound/pcm.h>
  #include <sound/pcm_params.h>
  #include "pcm_plugin.h"
  #include <sound/info.h>
  #include <linux/soundcard.h>
  #include <sound/initval.h>

  #include <sound/mixer_oss.h>

  
  #define OSS_ALSAEMULVER		_SIOR ('M', 249, int)

  static int dsp_map[SNDRV_CARDS];

  static int adsp_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};

  static bool nonblock_open = 1;

  MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");

  MODULE_DESCRIPTION("PCM OSS emulation for ALSA.");
  MODULE_LICENSE("GPL");
  module_param_array(dsp_map, int, NULL, 0444);
  MODULE_PARM_DESC(dsp_map, "PCM device number assigned to 1st OSS device.");
  module_param_array(adsp_map, int, NULL, 0444);
  MODULE_PARM_DESC(adsp_map, "PCM device number assigned to 2nd OSS device.");
  module_param(nonblock_open, bool, 0644);
  MODULE_PARM_DESC(nonblock_open, "Don't block opening busy PCM devices.");
  MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_PCM);
  MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_PCM1);

  static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file);
  static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file);
  static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file);

  
  static inline mm_segment_t snd_enter_user(void)
  {
  	mm_segment_t fs = get_fs();
  	set_fs(get_ds());
  	return fs;
  }
  
  static inline void snd_leave_user(mm_segment_t fs)
  {
  	set_fs(fs);
  }

  /*
   * helper functions to process hw_params
   */
  static int snd_interval_refine_min(struct snd_interval *i, unsigned int min, int openmin)
  {
  	int changed = 0;
  	if (i->min < min) {
  		i->min = min;
  		i->openmin = openmin;
  		changed = 1;
  	} else if (i->min == min && !i->openmin && openmin) {
  		i->openmin = 1;
  		changed = 1;
  	}
  	if (i->integer) {
  		if (i->openmin) {
  			i->min++;
  			i->openmin = 0;
  		}
  	}
  	if (snd_interval_checkempty(i)) {
  		snd_interval_none(i);
  		return -EINVAL;
  	}
  	return changed;
  }
  
  static int snd_interval_refine_max(struct snd_interval *i, unsigned int max, int openmax)
  {
  	int changed = 0;
  	if (i->max > max) {
  		i->max = max;
  		i->openmax = openmax;
  		changed = 1;
  	} else if (i->max == max && !i->openmax && openmax) {
  		i->openmax = 1;
  		changed = 1;
  	}
  	if (i->integer) {
  		if (i->openmax) {
  			i->max--;
  			i->openmax = 0;
  		}
  	}
  	if (snd_interval_checkempty(i)) {
  		snd_interval_none(i);
  		return -EINVAL;
  	}
  	return changed;
  }
  
  static int snd_interval_refine_set(struct snd_interval *i, unsigned int val)
  {
  	struct snd_interval t;
  	t.empty = 0;
  	t.min = t.max = val;
  	t.openmin = t.openmax = 0;
  	t.integer = 1;
  	return snd_interval_refine(i, &t);
  }
  
  /**
   * snd_pcm_hw_param_value_min
   * @params: the hw_params instance
   * @var: parameter to retrieve
   * @dir: pointer to the direction (-1,0,1) or NULL
   *
   * Return the minimum value for field PAR.
   */
  static unsigned int
  snd_pcm_hw_param_value_min(const struct snd_pcm_hw_params *params,
  			   snd_pcm_hw_param_t var, int *dir)
  {
  	if (hw_is_mask(var)) {
  		if (dir)
  			*dir = 0;
  		return snd_mask_min(hw_param_mask_c(params, var));
  	}
  	if (hw_is_interval(var)) {
  		const struct snd_interval *i = hw_param_interval_c(params, var);
  		if (dir)
  			*dir = i->openmin;
  		return snd_interval_min(i);
  	}
  	return -EINVAL;
  }
  
  /**
   * snd_pcm_hw_param_value_max
   * @params: the hw_params instance
   * @var: parameter to retrieve
   * @dir: pointer to the direction (-1,0,1) or NULL
   *
   * Return the maximum value for field PAR.
   */
  static unsigned int
  snd_pcm_hw_param_value_max(const struct snd_pcm_hw_params *params,
  			   snd_pcm_hw_param_t var, int *dir)
  {
  	if (hw_is_mask(var)) {
  		if (dir)
  			*dir = 0;
  		return snd_mask_max(hw_param_mask_c(params, var));
  	}
  	if (hw_is_interval(var)) {
  		const struct snd_interval *i = hw_param_interval_c(params, var);
  		if (dir)
  			*dir = - (int) i->openmax;
  		return snd_interval_max(i);
  	}
  	return -EINVAL;
  }
  
  static int _snd_pcm_hw_param_mask(struct snd_pcm_hw_params *params,
  				  snd_pcm_hw_param_t var,
  				  const struct snd_mask *val)
  {
  	int changed;
  	changed = snd_mask_refine(hw_param_mask(params, var), val);
  	if (changed) {
  		params->cmask |= 1 << var;
  		params->rmask |= 1 << var;
  	}
  	return changed;
  }
  
  static int snd_pcm_hw_param_mask(struct snd_pcm_substream *pcm,
  				 struct snd_pcm_hw_params *params,
  				 snd_pcm_hw_param_t var,
  				 const struct snd_mask *val)
  {
  	int changed = _snd_pcm_hw_param_mask(params, var, val);
  	if (changed < 0)
  		return changed;
  	if (params->rmask) {
  		int err = snd_pcm_hw_refine(pcm, params);
  		if (err < 0)
  			return err;
  	}
  	return 0;
  }
  
  static int _snd_pcm_hw_param_min(struct snd_pcm_hw_params *params,
  				 snd_pcm_hw_param_t var, unsigned int val,
  				 int dir)
  {
  	int changed;
  	int open = 0;
  	if (dir) {
  		if (dir > 0) {
  			open = 1;
  		} else if (dir < 0) {
  			if (val > 0) {
  				open = 1;
  				val--;
  			}
  		}
  	}
  	if (hw_is_mask(var))
  		changed = snd_mask_refine_min(hw_param_mask(params, var),
  					      val + !!open);
  	else if (hw_is_interval(var))
  		changed = snd_interval_refine_min(hw_param_interval(params, var),
  						  val, open);
  	else
  		return -EINVAL;
  	if (changed) {
  		params->cmask |= 1 << var;
  		params->rmask |= 1 << var;
  	}
  	return changed;
  }
  
  /**
   * snd_pcm_hw_param_min
   * @pcm: PCM instance
   * @params: the hw_params instance
   * @var: parameter to retrieve
   * @val: minimal value
   * @dir: pointer to the direction (-1,0,1) or NULL
   *
   * Inside configuration space defined by PARAMS remove from PAR all 
   * values < VAL. Reduce configuration space accordingly.
   * Return new minimum or -EINVAL if the configuration space is empty
   */
  static int snd_pcm_hw_param_min(struct snd_pcm_substream *pcm,
  				struct snd_pcm_hw_params *params,
  				snd_pcm_hw_param_t var, unsigned int val,
  				int *dir)
  {
  	int changed = _snd_pcm_hw_param_min(params, var, val, dir ? *dir : 0);
  	if (changed < 0)
  		return changed;
  	if (params->rmask) {
  		int err = snd_pcm_hw_refine(pcm, params);
  		if (err < 0)
  			return err;
  	}
  	return snd_pcm_hw_param_value_min(params, var, dir);
  }
  
  static int _snd_pcm_hw_param_max(struct snd_pcm_hw_params *params,
  				 snd_pcm_hw_param_t var, unsigned int val,
  				 int dir)
  {
  	int changed;
  	int open = 0;
  	if (dir) {
  		if (dir < 0) {
  			open = 1;
  		} else if (dir > 0) {
  			open = 1;
  			val++;
  		}
  	}
  	if (hw_is_mask(var)) {
  		if (val == 0 && open) {
  			snd_mask_none(hw_param_mask(params, var));
  			changed = -EINVAL;
  		} else
  			changed = snd_mask_refine_max(hw_param_mask(params, var),
  						      val - !!open);
  	} else if (hw_is_interval(var))
  		changed = snd_interval_refine_max(hw_param_interval(params, var),
  						  val, open);
  	else
  		return -EINVAL;
  	if (changed) {
  		params->cmask |= 1 << var;
  		params->rmask |= 1 << var;
  	}
  	return changed;
  }
  
  /**
   * snd_pcm_hw_param_max
   * @pcm: PCM instance
   * @params: the hw_params instance
   * @var: parameter to retrieve
   * @val: maximal value
   * @dir: pointer to the direction (-1,0,1) or NULL
   *
   * Inside configuration space defined by PARAMS remove from PAR all 
   *  values >= VAL + 1. Reduce configuration space accordingly.
   *  Return new maximum or -EINVAL if the configuration space is empty
   */
  static int snd_pcm_hw_param_max(struct snd_pcm_substream *pcm,
  				struct snd_pcm_hw_params *params,
  				snd_pcm_hw_param_t var, unsigned int val,
  				int *dir)
  {
  	int changed = _snd_pcm_hw_param_max(params, var, val, dir ? *dir : 0);
  	if (changed < 0)
  		return changed;
  	if (params->rmask) {
  		int err = snd_pcm_hw_refine(pcm, params);
  		if (err < 0)
  			return err;
  	}
  	return snd_pcm_hw_param_value_max(params, var, dir);
  }
  
  static int boundary_sub(int a, int adir,
  			int b, int bdir,
  			int *c, int *cdir)
  {
  	adir = adir < 0 ? -1 : (adir > 0 ? 1 : 0);
  	bdir = bdir < 0 ? -1 : (bdir > 0 ? 1 : 0);
  	*c = a - b;
  	*cdir = adir - bdir;
  	if (*cdir == -2) {
  		(*c)--;
  	} else if (*cdir == 2) {
  		(*c)++;
  	}
  	return 0;
  }
  
  static int boundary_lt(unsigned int a, int adir,
  		       unsigned int b, int bdir)
  {
  	if (adir < 0) {
  		a--;
  		adir = 1;
  	} else if (adir > 0)
  		adir = 1;
  	if (bdir < 0) {
  		b--;
  		bdir = 1;
  	} else if (bdir > 0)
  		bdir = 1;
  	return a < b || (a == b && adir < bdir);
  }
  
  /* Return 1 if min is nearer to best than max */
  static int boundary_nearer(int min, int mindir,
  			   int best, int bestdir,
  			   int max, int maxdir)
  {
  	int dmin, dmindir;
  	int dmax, dmaxdir;
  	boundary_sub(best, bestdir, min, mindir, &dmin, &dmindir);
  	boundary_sub(max, maxdir, best, bestdir, &dmax, &dmaxdir);
  	return boundary_lt(dmin, dmindir, dmax, dmaxdir);
  }
  
  /**
   * snd_pcm_hw_param_near
   * @pcm: PCM instance
   * @params: the hw_params instance
   * @var: parameter to retrieve
   * @best: value to set
   * @dir: pointer to the direction (-1,0,1) or NULL
   *
   * Inside configuration space defined by PARAMS set PAR to the available value
   * nearest to VAL. Reduce configuration space accordingly.
   * This function cannot be called for SNDRV_PCM_HW_PARAM_ACCESS,
   * SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_SUBFORMAT.
   * Return the value found.
    */
  static int snd_pcm_hw_param_near(struct snd_pcm_substream *pcm,
  				 struct snd_pcm_hw_params *params,
  				 snd_pcm_hw_param_t var, unsigned int best,
  				 int *dir)
  {
  	struct snd_pcm_hw_params *save = NULL;
  	int v;
  	unsigned int saved_min;
  	int last = 0;
  	int min, max;
  	int mindir, maxdir;
  	int valdir = dir ? *dir : 0;
  	/* FIXME */
  	if (best > INT_MAX)
  		best = INT_MAX;
  	min = max = best;
  	mindir = maxdir = valdir;
  	if (maxdir > 0)
  		maxdir = 0;
  	else if (maxdir == 0)
  		maxdir = -1;
  	else {
  		maxdir = 1;
  		max--;
  	}
  	save = kmalloc(sizeof(*save), GFP_KERNEL);
  	if (save == NULL)
  		return -ENOMEM;
  	*save = *params;
  	saved_min = min;
  	min = snd_pcm_hw_param_min(pcm, params, var, min, &mindir);
  	if (min >= 0) {
  		struct snd_pcm_hw_params *params1;
  		if (max < 0)
  			goto _end;
  		if ((unsigned int)min == saved_min && mindir == valdir)
  			goto _end;
  		params1 = kmalloc(sizeof(*params1), GFP_KERNEL);
  		if (params1 == NULL) {
  			kfree(save);
  			return -ENOMEM;
  		}
  		*params1 = *save;
  		max = snd_pcm_hw_param_max(pcm, params1, var, max, &maxdir);
  		if (max < 0) {
  			kfree(params1);
  			goto _end;
  		}
  		if (boundary_nearer(max, maxdir, best, valdir, min, mindir)) {
  			*params = *params1;
  			last = 1;
  		}
  		kfree(params1);
  	} else {
  		*params = *save;
  		max = snd_pcm_hw_param_max(pcm, params, var, max, &maxdir);

  		if (max < 0) {
  			kfree(save);

  			return max;

  		}

  		last = 1;
  	}
   _end:
   	kfree(save);
  	if (last)
  		v = snd_pcm_hw_param_last(pcm, params, var, dir);
  	else
  		v = snd_pcm_hw_param_first(pcm, params, var, dir);

  	snd_BUG_ON(v < 0);

  	return v;
  }
  
  static int _snd_pcm_hw_param_set(struct snd_pcm_hw_params *params,
  				 snd_pcm_hw_param_t var, unsigned int val,
  				 int dir)
  {
  	int changed;
  	if (hw_is_mask(var)) {
  		struct snd_mask *m = hw_param_mask(params, var);
  		if (val == 0 && dir < 0) {
  			changed = -EINVAL;
  			snd_mask_none(m);
  		} else {
  			if (dir > 0)
  				val++;
  			else if (dir < 0)
  				val--;
  			changed = snd_mask_refine_set(hw_param_mask(params, var), val);
  		}
  	} else if (hw_is_interval(var)) {
  		struct snd_interval *i = hw_param_interval(params, var);
  		if (val == 0 && dir < 0) {
  			changed = -EINVAL;
  			snd_interval_none(i);
  		} else if (dir == 0)
  			changed = snd_interval_refine_set(i, val);
  		else {
  			struct snd_interval t;
  			t.openmin = 1;
  			t.openmax = 1;
  			t.empty = 0;
  			t.integer = 0;
  			if (dir < 0) {
  				t.min = val - 1;
  				t.max = val;
  			} else {
  				t.min = val;
  				t.max = val+1;
  			}
  			changed = snd_interval_refine(i, &t);
  		}
  	} else
  		return -EINVAL;
  	if (changed) {
  		params->cmask |= 1 << var;
  		params->rmask |= 1 << var;
  	}
  	return changed;
  }
  
  /**
   * snd_pcm_hw_param_set
   * @pcm: PCM instance
   * @params: the hw_params instance
   * @var: parameter to retrieve
   * @val: value to set
   * @dir: pointer to the direction (-1,0,1) or NULL
   *
   * Inside configuration space defined by PARAMS remove from PAR all 
   * values != VAL. Reduce configuration space accordingly.
   *  Return VAL or -EINVAL if the configuration space is empty
   */
  static int snd_pcm_hw_param_set(struct snd_pcm_substream *pcm,
  				struct snd_pcm_hw_params *params,
  				snd_pcm_hw_param_t var, unsigned int val,
  				int dir)
  {
  	int changed = _snd_pcm_hw_param_set(params, var, val, dir);
  	if (changed < 0)
  		return changed;
  	if (params->rmask) {
  		int err = snd_pcm_hw_refine(pcm, params);
  		if (err < 0)
  			return err;
  	}
  	return snd_pcm_hw_param_value(params, var, NULL);
  }
  
  static int _snd_pcm_hw_param_setinteger(struct snd_pcm_hw_params *params,
  					snd_pcm_hw_param_t var)
  {
  	int changed;
  	changed = snd_interval_setinteger(hw_param_interval(params, var));
  	if (changed) {
  		params->cmask |= 1 << var;
  		params->rmask |= 1 << var;
  	}
  	return changed;
  }
  	
  /*
   * plugin
   */

  #ifdef CONFIG_SND_PCM_OSS_PLUGINS

  static int snd_pcm_oss_plugin_clear(struct snd_pcm_substream *substream)

  {

  	struct snd_pcm_runtime *runtime = substream->runtime;
  	struct snd_pcm_plugin *plugin, *next;

  	
  	plugin = runtime->oss.plugin_first;
  	while (plugin) {
  		next = plugin->next;
  		snd_pcm_plugin_free(plugin);
  		plugin = next;
  	}
  	runtime->oss.plugin_first = runtime->oss.plugin_last = NULL;
  	return 0;
  }

  static int snd_pcm_plugin_insert(struct snd_pcm_plugin *plugin)

  {

  	struct snd_pcm_runtime *runtime = plugin->plug->runtime;

  	plugin->next = runtime->oss.plugin_first;
  	plugin->prev = NULL;
  	if (runtime->oss.plugin_first) {
  		runtime->oss.plugin_first->prev = plugin;
  		runtime->oss.plugin_first = plugin;
  	} else {
  		runtime->oss.plugin_last =
  		runtime->oss.plugin_first = plugin;
  	}
  	return 0;
  }

  int snd_pcm_plugin_append(struct snd_pcm_plugin *plugin)

  {

  	struct snd_pcm_runtime *runtime = plugin->plug->runtime;

  	plugin->next = NULL;
  	plugin->prev = runtime->oss.plugin_last;
  	if (runtime->oss.plugin_last) {
  		runtime->oss.plugin_last->next = plugin;
  		runtime->oss.plugin_last = plugin;
  	} else {
  		runtime->oss.plugin_last =
  		runtime->oss.plugin_first = plugin;
  	}
  	return 0;
  }

  #endif /* CONFIG_SND_PCM_OSS_PLUGINS */

  static long snd_pcm_oss_bytes(struct snd_pcm_substream *substream, long frames)

  {

  	struct snd_pcm_runtime *runtime = substream->runtime;

  	long buffer_size = snd_pcm_lib_buffer_bytes(substream);

  	long bytes = frames_to_bytes(runtime, frames);

  	if (buffer_size == runtime->oss.buffer_bytes)

  		return bytes;

  #if BITS_PER_LONG >= 64
  	return runtime->oss.buffer_bytes * bytes / buffer_size;
  #else
  	{
  		u64 bsize = (u64)runtime->oss.buffer_bytes * (u64)bytes;

  		return div_u64(bsize, buffer_size);

  	}
  #endif

  }

  static long snd_pcm_alsa_frames(struct snd_pcm_substream *substream, long bytes)

  {

  	struct snd_pcm_runtime *runtime = substream->runtime;

  	long buffer_size = snd_pcm_lib_buffer_bytes(substream);

  	if (buffer_size == runtime->oss.buffer_bytes)
  		return bytes_to_frames(runtime, bytes);
  	return bytes_to_frames(runtime, (buffer_size * bytes) / runtime->oss.buffer_bytes);
  }

  static inline
  snd_pcm_uframes_t get_hw_ptr_period(struct snd_pcm_runtime *runtime)
  {

  	return runtime->hw_ptr_interrupt;

  }

  /* define extended formats in the recent OSS versions (if any) */
  /* linear formats */
  #define AFMT_S32_LE      0x00001000
  #define AFMT_S32_BE      0x00002000
  #define AFMT_S24_LE      0x00008000
  #define AFMT_S24_BE      0x00010000
  #define AFMT_S24_PACKED  0x00040000
  
  /* other supported formats */
  #define AFMT_FLOAT       0x00004000
  #define AFMT_SPDIF_RAW   0x00020000
  
  /* unsupported formats */
  #define AFMT_AC3         0x00000400
  #define AFMT_VORBIS      0x00000800

  static snd_pcm_format_t snd_pcm_oss_format_from(int format)

  {
  	switch (format) {
  	case AFMT_MU_LAW:	return SNDRV_PCM_FORMAT_MU_LAW;
  	case AFMT_A_LAW:	return SNDRV_PCM_FORMAT_A_LAW;
  	case AFMT_IMA_ADPCM:	return SNDRV_PCM_FORMAT_IMA_ADPCM;
  	case AFMT_U8:		return SNDRV_PCM_FORMAT_U8;
  	case AFMT_S16_LE:	return SNDRV_PCM_FORMAT_S16_LE;
  	case AFMT_S16_BE:	return SNDRV_PCM_FORMAT_S16_BE;
  	case AFMT_S8:		return SNDRV_PCM_FORMAT_S8;
  	case AFMT_U16_LE:	return SNDRV_PCM_FORMAT_U16_LE;
  	case AFMT_U16_BE:	return SNDRV_PCM_FORMAT_U16_BE;
  	case AFMT_MPEG:		return SNDRV_PCM_FORMAT_MPEG;

  	case AFMT_S32_LE:	return SNDRV_PCM_FORMAT_S32_LE;
  	case AFMT_S32_BE:	return SNDRV_PCM_FORMAT_S32_BE;
  	case AFMT_S24_LE:	return SNDRV_PCM_FORMAT_S24_LE;
  	case AFMT_S24_BE:	return SNDRV_PCM_FORMAT_S24_BE;
  	case AFMT_S24_PACKED:	return SNDRV_PCM_FORMAT_S24_3LE;
  	case AFMT_FLOAT:	return SNDRV_PCM_FORMAT_FLOAT;
  	case AFMT_SPDIF_RAW:	return SNDRV_PCM_FORMAT_IEC958_SUBFRAME;

  	default:		return SNDRV_PCM_FORMAT_U8;
  	}
  }

  static int snd_pcm_oss_format_to(snd_pcm_format_t format)

  {
  	switch (format) {
  	case SNDRV_PCM_FORMAT_MU_LAW:	return AFMT_MU_LAW;
  	case SNDRV_PCM_FORMAT_A_LAW:	return AFMT_A_LAW;
  	case SNDRV_PCM_FORMAT_IMA_ADPCM:	return AFMT_IMA_ADPCM;
  	case SNDRV_PCM_FORMAT_U8:		return AFMT_U8;
  	case SNDRV_PCM_FORMAT_S16_LE:	return AFMT_S16_LE;
  	case SNDRV_PCM_FORMAT_S16_BE:	return AFMT_S16_BE;
  	case SNDRV_PCM_FORMAT_S8:		return AFMT_S8;
  	case SNDRV_PCM_FORMAT_U16_LE:	return AFMT_U16_LE;
  	case SNDRV_PCM_FORMAT_U16_BE:	return AFMT_U16_BE;
  	case SNDRV_PCM_FORMAT_MPEG:		return AFMT_MPEG;

  	case SNDRV_PCM_FORMAT_S32_LE:	return AFMT_S32_LE;
  	case SNDRV_PCM_FORMAT_S32_BE:	return AFMT_S32_BE;
  	case SNDRV_PCM_FORMAT_S24_LE:	return AFMT_S24_LE;
  	case SNDRV_PCM_FORMAT_S24_BE:	return AFMT_S24_BE;
  	case SNDRV_PCM_FORMAT_S24_3LE:	return AFMT_S24_PACKED;
  	case SNDRV_PCM_FORMAT_FLOAT:	return AFMT_FLOAT;
  	case SNDRV_PCM_FORMAT_IEC958_SUBFRAME: return AFMT_SPDIF_RAW;

  	default:			return -EINVAL;
  	}
  }

  static int snd_pcm_oss_period_size(struct snd_pcm_substream *substream, 
  				   struct snd_pcm_hw_params *oss_params,
  				   struct snd_pcm_hw_params *slave_params)

  {
  	size_t s;
  	size_t oss_buffer_size, oss_period_size, oss_periods;
  	size_t min_period_size, max_period_size;

  	struct snd_pcm_runtime *runtime = substream->runtime;

  	size_t oss_frame_size;
  
  	oss_frame_size = snd_pcm_format_physical_width(params_format(oss_params)) *
  			 params_channels(oss_params) / 8;
  
  	oss_buffer_size = snd_pcm_plug_client_size(substream,
  						   snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, NULL)) * oss_frame_size;
  	oss_buffer_size = 1 << ld2(oss_buffer_size);

  	if (atomic_read(&substream->mmap_count)) {

  		if (oss_buffer_size > runtime->oss.mmap_bytes)
  			oss_buffer_size = runtime->oss.mmap_bytes;
  	}

  	if (substream->oss.setup.period_size > 16)
  		oss_period_size = substream->oss.setup.period_size;

  	else if (runtime->oss.fragshift) {
  		oss_period_size = 1 << runtime->oss.fragshift;
  		if (oss_period_size > oss_buffer_size / 2)
  			oss_period_size = oss_buffer_size / 2;
  	} else {
  		int sd;
  		size_t bytes_per_sec = params_rate(oss_params) * snd_pcm_format_physical_width(params_format(oss_params)) * params_channels(oss_params) / 8;
  
  		oss_period_size = oss_buffer_size;
  		do {
  			oss_period_size /= 2;
  		} while (oss_period_size > bytes_per_sec);
  		if (runtime->oss.subdivision == 0) {
  			sd = 4;
  			if (oss_period_size / sd > 4096)
  				sd *= 2;
  			if (oss_period_size / sd < 4096)
  				sd = 1;
  		} else
  			sd = runtime->oss.subdivision;
  		oss_period_size /= sd;
  		if (oss_period_size < 16)
  			oss_period_size = 16;
  	}
  
  	min_period_size = snd_pcm_plug_client_size(substream,
  						   snd_pcm_hw_param_value_min(slave_params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, NULL));
  	min_period_size *= oss_frame_size;
  	min_period_size = 1 << (ld2(min_period_size - 1) + 1);
  	if (oss_period_size < min_period_size)
  		oss_period_size = min_period_size;
  
  	max_period_size = snd_pcm_plug_client_size(substream,
  						   snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, NULL));
  	max_period_size *= oss_frame_size;
  	max_period_size = 1 << ld2(max_period_size);
  	if (oss_period_size > max_period_size)
  		oss_period_size = max_period_size;
  
  	oss_periods = oss_buffer_size / oss_period_size;

  	if (substream->oss.setup.periods > 1)
  		oss_periods = substream->oss.setup.periods;

  
  	s = snd_pcm_hw_param_value_max(slave_params, SNDRV_PCM_HW_PARAM_PERIODS, NULL);
  	if (runtime->oss.maxfrags && s > runtime->oss.maxfrags)
  		s = runtime->oss.maxfrags;
  	if (oss_periods > s)
  		oss_periods = s;
  
  	s = snd_pcm_hw_param_value_min(slave_params, SNDRV_PCM_HW_PARAM_PERIODS, NULL);
  	if (s < 2)
  		s = 2;
  	if (oss_periods < s)
  		oss_periods = s;
  
  	while (oss_period_size * oss_periods > oss_buffer_size)
  		oss_period_size /= 2;

  	if (oss_period_size < 16)
  		return -EINVAL;

  	runtime->oss.period_bytes = oss_period_size;
  	runtime->oss.period_frames = 1;
  	runtime->oss.periods = oss_periods;
  	return 0;
  }

  static int choose_rate(struct snd_pcm_substream *substream,
  		       struct snd_pcm_hw_params *params, unsigned int best_rate)

  {

  	struct snd_interval *it;
  	struct snd_pcm_hw_params *save;

  	unsigned int rate, prev;
  
  	save = kmalloc(sizeof(*save), GFP_KERNEL);
  	if (save == NULL)
  		return -ENOMEM;
  	*save = *params;
  	it = hw_param_interval(save, SNDRV_PCM_HW_PARAM_RATE);
  
  	/* try multiples of the best rate */
  	rate = best_rate;
  	for (;;) {
  		if (it->max < rate || (it->max == rate && it->openmax))
  			break;
  		if (it->min < rate || (it->min == rate && !it->openmin)) {
  			int ret;
  			ret = snd_pcm_hw_param_set(substream, params,
  						   SNDRV_PCM_HW_PARAM_RATE,
  						   rate, 0);
  			if (ret == (int)rate) {
  				kfree(save);
  				return rate;
  			}
  			*params = *save;
  		}
  		prev = rate;
  		rate += best_rate;
  		if (rate <= prev)
  			break;
  	}
  
  	/* not found, use the nearest rate */
  	kfree(save);
  	return snd_pcm_hw_param_near(substream, params, SNDRV_PCM_HW_PARAM_RATE, best_rate, NULL);
  }

  static int snd_pcm_oss_change_params(struct snd_pcm_substream *substream)

  {

  	struct snd_pcm_runtime *runtime = substream->runtime;
  	struct snd_pcm_hw_params *params, *sparams;
  	struct snd_pcm_sw_params *sw_params;

  	ssize_t oss_buffer_size, oss_period_size;
  	size_t oss_frame_size;
  	int err;
  	int direct;

  	snd_pcm_format_t format, sformat;
  	int n;

  	struct snd_mask sformat_mask;
  	struct snd_mask mask;

  	if (mutex_lock_interruptible(&runtime->oss.params_lock))
  		return -EINTR;

  	sw_params = kmalloc(sizeof(*sw_params), GFP_KERNEL);
  	params = kmalloc(sizeof(*params), GFP_KERNEL);
  	sparams = kmalloc(sizeof(*sparams), GFP_KERNEL);
  	if (!sw_params || !params || !sparams) {
  		snd_printd("No memory
  ");
  		err = -ENOMEM;
  		goto failure;
  	}

  	if (atomic_read(&substream->mmap_count))

  		direct = 1;

  	else
  		direct = substream->oss.setup.direct;

  
  	_snd_pcm_hw_params_any(sparams);
  	_snd_pcm_hw_param_setinteger(sparams, SNDRV_PCM_HW_PARAM_PERIODS);
  	_snd_pcm_hw_param_min(sparams, SNDRV_PCM_HW_PARAM_PERIODS, 2, 0);
  	snd_mask_none(&mask);

  	if (atomic_read(&substream->mmap_count))

  		snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);

  	else {

  		snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED);

  		if (!direct)

  			snd_mask_set(&mask, (__force int)SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);

  	}
  	err = snd_pcm_hw_param_mask(substream, sparams, SNDRV_PCM_HW_PARAM_ACCESS, &mask);
  	if (err < 0) {
  		snd_printd("No usable accesses
  ");
  		err = -EINVAL;
  		goto failure;
  	}
  	choose_rate(substream, sparams, runtime->oss.rate);
  	snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_CHANNELS, runtime->oss.channels, NULL);
  
  	format = snd_pcm_oss_format_from(runtime->oss.format);
  
  	sformat_mask = *hw_param_mask(sparams, SNDRV_PCM_HW_PARAM_FORMAT);
  	if (direct)
  		sformat = format;
  	else
  		sformat = snd_pcm_plug_slave_format(format, &sformat_mask);

  	if ((__force int)sformat < 0 ||
  	    !snd_mask_test(&sformat_mask, (__force int)sformat)) {
  		for (sformat = (__force snd_pcm_format_t)0;
  		     (__force int)sformat <= (__force int)SNDRV_PCM_FORMAT_LAST;
  		     sformat = (__force snd_pcm_format_t)((__force int)sformat + 1)) {
  			if (snd_mask_test(&sformat_mask, (__force int)sformat) &&

  			    snd_pcm_oss_format_to(sformat) >= 0)
  				break;
  		}

  		if ((__force int)sformat > (__force int)SNDRV_PCM_FORMAT_LAST) {

  			snd_printd("Cannot find a format!!!
  ");
  			err = -EINVAL;
  			goto failure;
  		}
  	}

  	err = _snd_pcm_hw_param_set(sparams, SNDRV_PCM_HW_PARAM_FORMAT, (__force int)sformat, 0);

  	if (err < 0)
  		goto failure;

  
  	if (direct) {
  		memcpy(params, sparams, sizeof(*params));
  	} else {
  		_snd_pcm_hw_params_any(params);
  		_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_ACCESS,

  				      (__force int)SNDRV_PCM_ACCESS_RW_INTERLEAVED, 0);

  		_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_FORMAT,

  				      (__force int)snd_pcm_oss_format_from(runtime->oss.format), 0);

  		_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_CHANNELS,
  				      runtime->oss.channels, 0);
  		_snd_pcm_hw_param_set(params, SNDRV_PCM_HW_PARAM_RATE,
  				      runtime->oss.rate, 0);
  		pdprintf("client: access = %i, format = %i, channels = %i, rate = %i
  ",
  			 params_access(params), params_format(params),
  			 params_channels(params), params_rate(params));
  	}
  	pdprintf("slave: access = %i, format = %i, channels = %i, rate = %i
  ",
  		 params_access(sparams), params_format(sparams),
  		 params_channels(sparams), params_rate(sparams));
  
  	oss_frame_size = snd_pcm_format_physical_width(params_format(params)) *
  			 params_channels(params) / 8;

  #ifdef CONFIG_SND_PCM_OSS_PLUGINS

  	snd_pcm_oss_plugin_clear(substream);
  	if (!direct) {
  		/* add necessary plugins */
  		snd_pcm_oss_plugin_clear(substream);
  		if ((err = snd_pcm_plug_format_plugins(substream,
  						       params, 
  						       sparams)) < 0) {
  			snd_printd("snd_pcm_plug_format_plugins failed: %i
  ", err);
  			snd_pcm_oss_plugin_clear(substream);
  			goto failure;
  		}
  		if (runtime->oss.plugin_first) {

  			struct snd_pcm_plugin *plugin;

  			if ((err = snd_pcm_plugin_build_io(substream, sparams, &plugin)) < 0) {
  				snd_printd("snd_pcm_plugin_build_io failed: %i
  ", err);
  				snd_pcm_oss_plugin_clear(substream);
  				goto failure;
  			}
  			if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
  				err = snd_pcm_plugin_append(plugin);
  			} else {
  				err = snd_pcm_plugin_insert(plugin);
  			}
  			if (err < 0) {
  				snd_pcm_oss_plugin_clear(substream);
  				goto failure;
  			}
  		}
  	}

  #endif

  
  	err = snd_pcm_oss_period_size(substream, params, sparams);
  	if (err < 0)
  		goto failure;
  
  	n = snd_pcm_plug_slave_size(substream, runtime->oss.period_bytes / oss_frame_size);
  	err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, n, NULL);

  	if (err < 0)
  		goto failure;

  
  	err = snd_pcm_hw_param_near(substream, sparams, SNDRV_PCM_HW_PARAM_PERIODS,
  				     runtime->oss.periods, NULL);

  	if (err < 0)
  		goto failure;

  
  	snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
  
  	if ((err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_HW_PARAMS, sparams)) < 0) {
  		snd_printd("HW_PARAMS failed: %i
  ", err);
  		goto failure;
  	}
  
  	memset(sw_params, 0, sizeof(*sw_params));
  	if (runtime->oss.trigger) {
  		sw_params->start_threshold = 1;
  	} else {
  		sw_params->start_threshold = runtime->boundary;
  	}

  	if (atomic_read(&substream->mmap_count) ||
  	    substream->stream == SNDRV_PCM_STREAM_CAPTURE)

  		sw_params->stop_threshold = runtime->boundary;
  	else
  		sw_params->stop_threshold = runtime->buffer_size;
  	sw_params->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
  	sw_params->period_step = 1;

  	sw_params->avail_min = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
  		1 : runtime->period_size;

  	if (atomic_read(&substream->mmap_count) ||

  	    substream->oss.setup.nosilence) {

  		sw_params->silence_threshold = 0;
  		sw_params->silence_size = 0;
  	} else {
  		snd_pcm_uframes_t frames;
  		frames = runtime->period_size + 16;
  		if (frames > runtime->buffer_size)
  			frames = runtime->buffer_size;
  		sw_params->silence_threshold = frames;
  		sw_params->silence_size = frames;
  	}
  
  	if ((err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_SW_PARAMS, sw_params)) < 0) {
  		snd_printd("SW_PARAMS failed: %i
  ", err);
  		goto failure;
  	}
  
  	runtime->oss.periods = params_periods(sparams);
  	oss_period_size = snd_pcm_plug_client_size(substream, params_period_size(sparams));

  	if (oss_period_size < 0) {
  		err = -EINVAL;
  		goto failure;
  	}

  #ifdef CONFIG_SND_PCM_OSS_PLUGINS

  	if (runtime->oss.plugin_first) {
  		err = snd_pcm_plug_alloc(substream, oss_period_size);
  		if (err < 0)
  			goto failure;
  	}

  #endif

  	oss_period_size *= oss_frame_size;
  
  	oss_buffer_size = oss_period_size * runtime->oss.periods;

  	if (oss_buffer_size < 0) {
  		err = -EINVAL;
  		goto failure;
  	}

  
  	runtime->oss.period_bytes = oss_period_size;
  	runtime->oss.buffer_bytes = oss_buffer_size;
  
  	pdprintf("oss: period bytes = %i, buffer bytes = %i
  ",
  		 runtime->oss.period_bytes,
  		 runtime->oss.buffer_bytes);
  	pdprintf("slave: period_size = %i, buffer_size = %i
  ",
  		 params_period_size(sparams),
  		 params_buffer_size(sparams));
  
  	runtime->oss.format = snd_pcm_oss_format_to(params_format(params));
  	runtime->oss.channels = params_channels(params);
  	runtime->oss.rate = params_rate(params);

  	vfree(runtime->oss.buffer);
  	runtime->oss.buffer = vmalloc(runtime->oss.period_bytes);

  	if (!runtime->oss.buffer) {
  		err = -ENOMEM;
  		goto failure;
  	}
  
  	runtime->oss.params = 0;
  	runtime->oss.prepare = 1;

  	runtime->oss.buffer_used = 0;
  	if (runtime->dma_area)
  		snd_pcm_format_set_silence(runtime->format, runtime->dma_area, bytes_to_samples(runtime, runtime->dma_bytes));
  
  	runtime->oss.period_frames = snd_pcm_alsa_frames(substream, oss_period_size);
  
  	err = 0;
  failure:
  	kfree(sw_params);
  	kfree(params);
  	kfree(sparams);

  	mutex_unlock(&runtime->oss.params_lock);

  	return err;
  }

  static int snd_pcm_oss_get_active_substream(struct snd_pcm_oss_file *pcm_oss_file, struct snd_pcm_substream **r_substream)

  {
  	int idx, err;

  	struct snd_pcm_substream *asubstream = NULL, *substream;

  
  	for (idx = 0; idx < 2; idx++) {
  		substream = pcm_oss_file->streams[idx];
  		if (substream == NULL)
  			continue;
  		if (asubstream == NULL)
  			asubstream = substream;
  		if (substream->runtime->oss.params) {
  			err = snd_pcm_oss_change_params(substream);
  			if (err < 0)
  				return err;
  		}
  	}

  	if (!asubstream)
  		return -EIO;

  	if (r_substream)
  		*r_substream = asubstream;
  	return 0;
  }

  static int snd_pcm_oss_prepare(struct snd_pcm_substream *substream)

  {
  	int err;

  	struct snd_pcm_runtime *runtime = substream->runtime;

  
  	err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_PREPARE, NULL);
  	if (err < 0) {
  		snd_printd("snd_pcm_oss_prepare: SNDRV_PCM_IOCTL_PREPARE failed
  ");
  		return err;
  	}
  	runtime->oss.prepare = 0;

  	runtime->oss.prev_hw_ptr_period = 0;

  	runtime->oss.period_ptr = 0;
  	runtime->oss.buffer_used = 0;
  
  	return 0;
  }

  static int snd_pcm_oss_make_ready(struct snd_pcm_substream *substream)

  {

  	struct snd_pcm_runtime *runtime;

  	int err;
  
  	if (substream == NULL)
  		return 0;
  	runtime = substream->runtime;
  	if (runtime->oss.params) {
  		err = snd_pcm_oss_change_params(substream);
  		if (err < 0)
  			return err;
  	}
  	if (runtime->oss.prepare) {
  		err = snd_pcm_oss_prepare(substream);
  		if (err < 0)
  			return err;
  	}
  	return 0;
  }

  static int snd_pcm_oss_capture_position_fixup(struct snd_pcm_substream *substream, snd_pcm_sframes_t *delay)

  {

  	struct snd_pcm_runtime *runtime;

  	snd_pcm_uframes_t frames;
  	int err = 0;
  
  	while (1) {
  		err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, delay);
  		if (err < 0)
  			break;
  		runtime = substream->runtime;
  		if (*delay <= (snd_pcm_sframes_t)runtime->buffer_size)
  			break;
  		/* in case of overrun, skip whole periods like OSS/Linux driver does */
  		/* until avail(delay) <= buffer_size */
  		frames = (*delay - runtime->buffer_size) + runtime->period_size - 1;
  		frames /= runtime->period_size;
  		frames *= runtime->period_size;
  		err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_FORWARD, &frames);
  		if (err < 0)
  			break;
  	}
  	return err;
  }

  snd_pcm_sframes_t snd_pcm_oss_write3(struct snd_pcm_substream *substream, const char *ptr, snd_pcm_uframes_t frames, int in_kernel)

  {

  	struct snd_pcm_runtime *runtime = substream->runtime;

  	int ret;
  	while (1) {
  		if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
  		    runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
  #ifdef OSS_DEBUG
  			if (runtime->status->state == SNDRV_PCM_STATE_XRUN)

  				printk(KERN_DEBUG "pcm_oss: write: "
  				       "recovering from XRUN
  ");

  			else

  				printk(KERN_DEBUG "pcm_oss: write: "
  				       "recovering from SUSPEND
  ");

  #endif
  			ret = snd_pcm_oss_prepare(substream);
  			if (ret < 0)
  				break;
  		}
  		if (in_kernel) {
  			mm_segment_t fs;
  			fs = snd_enter_user();

  			ret = snd_pcm_lib_write(substream, (void __force __user *)ptr, frames);

  			snd_leave_user(fs);
  		} else {

  			ret = snd_pcm_lib_write(substream, (void __force __user *)ptr, frames);

  		}
  		if (ret != -EPIPE && ret != -ESTRPIPE)
  			break;
  		/* test, if we can't store new data, because the stream */
  		/* has not been started */
  		if (runtime->status->state == SNDRV_PCM_STATE_PREPARED)
  			return -EAGAIN;
  	}
  	return ret;
  }

  snd_pcm_sframes_t snd_pcm_oss_read3(struct snd_pcm_substream *substream, char *ptr, snd_pcm_uframes_t frames, int in_kernel)

  {

  	struct snd_pcm_runtime *runtime = substream->runtime;

  	snd_pcm_sframes_t delay;
  	int ret;
  	while (1) {
  		if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
  		    runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
  #ifdef OSS_DEBUG
  			if (runtime->status->state == SNDRV_PCM_STATE_XRUN)

  				printk(KERN_DEBUG "pcm_oss: read: "
  				       "recovering from XRUN
  ");

  			else

  				printk(KERN_DEBUG "pcm_oss: read: "
  				       "recovering from SUSPEND
  ");

  #endif
  			ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
  			if (ret < 0)
  				break;
  		} else if (runtime->status->state == SNDRV_PCM_STATE_SETUP) {
  			ret = snd_pcm_oss_prepare(substream);
  			if (ret < 0)
  				break;
  		}
  		ret = snd_pcm_oss_capture_position_fixup(substream, &delay);
  		if (ret < 0)
  			break;
  		if (in_kernel) {
  			mm_segment_t fs;
  			fs = snd_enter_user();

  			ret = snd_pcm_lib_read(substream, (void __force __user *)ptr, frames);

  			snd_leave_user(fs);
  		} else {

  			ret = snd_pcm_lib_read(substream, (void __force __user *)ptr, frames);

  		}
  		if (ret == -EPIPE) {
  			if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
  				ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);
  				if (ret < 0)
  					break;
  			}
  			continue;
  		}
  		if (ret != -ESTRPIPE)
  			break;
  	}
  	return ret;
  }

  snd_pcm_sframes_t snd_pcm_oss_writev3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames, int in_kernel)

  {

  	struct snd_pcm_runtime *runtime = substream->runtime;

  	int ret;
  	while (1) {
  		if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
  		    runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
  #ifdef OSS_DEBUG
  			if (runtime->status->state == SNDRV_PCM_STATE_XRUN)

  				printk(KERN_DEBUG "pcm_oss: writev: "
  				       "recovering from XRUN
  ");

  			else

  				printk(KERN_DEBUG "pcm_oss: writev: "
  				       "recovering from SUSPEND
  ");

  #endif
  			ret = snd_pcm_oss_prepare(substream);
  			if (ret < 0)
  				break;
  		}
  		if (in_kernel) {
  			mm_segment_t fs;
  			fs = snd_enter_user();
  			ret = snd_pcm_lib_writev(substream, (void __user **)bufs, frames);
  			snd_leave_user(fs);
  		} else {
  			ret = snd_pcm_lib_writev(substream, (void __user **)bufs, frames);
  		}
  		if (ret != -EPIPE && ret != -ESTRPIPE)
  			break;
  
  		/* test, if we can't store new data, because the stream */
  		/* has not been started */
  		if (runtime->status->state == SNDRV_PCM_STATE_PREPARED)
  			return -EAGAIN;
  	}
  	return ret;
  }
  	

  snd_pcm_sframes_t snd_pcm_oss_readv3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames, int in_kernel)

  {

  	struct snd_pcm_runtime *runtime = substream->runtime;

  	int ret;
  	while (1) {
  		if (runtime->status->state == SNDRV_PCM_STATE_XRUN ||
  		    runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
  #ifdef OSS_DEBUG
  			if (runtime->status->state == SNDRV_PCM_STATE_XRUN)

  				printk(KERN_DEBUG "pcm_oss: readv: "
  				       "recovering from XRUN
  ");

  			else

  				printk(KERN_DEBUG "pcm_oss: readv: "
  				       "recovering from SUSPEND
  ");

  #endif
  			ret = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);
  			if (ret < 0)
  				break;
  		} else if (runtime->status->state == SNDRV_PCM_STATE_SETUP) {
  			ret = snd_pcm_oss_prepare(substream);
  			if (ret < 0)
  				break;
  		}
  		if (in_kernel) {
  			mm_segment_t fs;
  			fs = snd_enter_user();
  			ret = snd_pcm_lib_readv(substream, (void __user **)bufs, frames);
  			snd_leave_user(fs);
  		} else {
  			ret = snd_pcm_lib_readv(substream, (void __user **)bufs, frames);
  		}
  		if (ret != -EPIPE && ret != -ESTRPIPE)
  			break;
  	}
  	return ret;
  }

  static ssize_t snd_pcm_oss_write2(struct snd_pcm_substream *substream, const char *buf, size_t bytes, int in_kernel)

  {

  	struct snd_pcm_runtime *runtime = substream->runtime;

  	snd_pcm_sframes_t frames, frames1;

  #ifdef CONFIG_SND_PCM_OSS_PLUGINS

  	if (runtime->oss.plugin_first) {

  		struct snd_pcm_plugin_channel *channels;

  		size_t oss_frame_bytes = (runtime->oss.plugin_first->src_width * runtime->oss.plugin_first->src_format.channels) / 8;
  		if (!in_kernel) {

  			if (copy_from_user(runtime->oss.buffer, (const char __force __user *)buf, bytes))

  				return -EFAULT;
  			buf = runtime->oss.buffer;
  		}
  		frames = bytes / oss_frame_bytes;
  		frames1 = snd_pcm_plug_client_channels_buf(substream, (char *)buf, frames, &channels);
  		if (frames1 < 0)
  			return frames1;
  		frames1 = snd_pcm_plug_write_transfer(substream, channels, frames1);
  		if (frames1 <= 0)
  			return frames1;
  		bytes = frames1 * oss_frame_bytes;

  	} else
  #endif
  	{

  		frames = bytes_to_frames(runtime, bytes);
  		frames1 = snd_pcm_oss_write3(substream, buf, frames, in_kernel);
  		if (frames1 <= 0)
  			return frames1;
  		bytes = frames_to_bytes(runtime, frames1);
  	}
  	return bytes;
  }

  static ssize_t snd_pcm_oss_write1(struct snd_pcm_substream *substream, const char __user *buf, size_t bytes)

  {
  	size_t xfer = 0;
  	ssize_t tmp;

  	struct snd_pcm_runtime *runtime = substream->runtime;

  	if (atomic_read(&substream->mmap_count))

  		return -ENXIO;
  
  	if ((tmp = snd_pcm_oss_make_ready(substream)) < 0)
  		return tmp;

  	mutex_lock(&runtime->oss.params_lock);

  	while (bytes > 0) {
  		if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
  			tmp = bytes;
  			if (tmp + runtime->oss.buffer_used > runtime->oss.period_bytes)
  				tmp = runtime->oss.period_bytes - runtime->oss.buffer_used;
  			if (tmp > 0) {

  				if (copy_from_user(runtime->oss.buffer + runtime->oss.buffer_used, buf, tmp)) {
  					tmp = -EFAULT;
  					goto err;
  				}

  			}
  			runtime->oss.buffer_used += tmp;
  			buf += tmp;
  			bytes -= tmp;
  			xfer += tmp;

  			if (substream->oss.setup.partialfrag ||

  			    runtime->oss.buffer_used == runtime->oss.period_bytes) {
  				tmp = snd_pcm_oss_write2(substream, runtime->oss.buffer + runtime->oss.period_ptr, 
  							 runtime->oss.buffer_used - runtime->oss.period_ptr, 1);
  				if (tmp <= 0)

  					goto err;

  				runtime->oss.bytes += tmp;
  				runtime->oss.period_ptr += tmp;
  				runtime->oss.period_ptr %= runtime->oss.period_bytes;
  				if (runtime->oss.period_ptr == 0 ||
  				    runtime->oss.period_ptr == runtime->oss.buffer_used)
  					runtime->oss.buffer_used = 0;

  				else if ((substream->f_flags & O_NONBLOCK) != 0) {
  					tmp = -EAGAIN;
  					goto err;
  				}

  			}
  		} else {

  			tmp = snd_pcm_oss_write2(substream,
  						 (const char __force *)buf,
  						 runtime->oss.period_bytes, 0);

  			if (tmp <= 0)

  				goto err;

  			runtime->oss.bytes += tmp;
  			buf += tmp;
  			bytes -= tmp;
  			xfer += tmp;

  			if ((substream->f_flags & O_NONBLOCK) != 0 &&

  			    tmp != runtime->oss.period_bytes)
  				break;
  		}
  	}

  	mutex_unlock(&runtime->oss.params_lock);

  	return xfer;

  
   err:
  	mutex_unlock(&runtime->oss.params_lock);
  	return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;

  }

  static ssize_t snd_pcm_oss_read2(struct snd_pcm_substream *substream, char *buf, size_t bytes, int in_kernel)

  {

  	struct snd_pcm_runtime *runtime = substream->runtime;

  	snd_pcm_sframes_t frames, frames1;

  #ifdef CONFIG_SND_PCM_OSS_PLUGINS

  	char __user *final_dst = (char __force __user *)buf;

  	if (runtime->oss.plugin_first) {

  		struct snd_pcm_plugin_channel *channels;

  		size_t oss_frame_bytes = (runtime->oss.plugin_last->dst_width * runtime->oss.plugin_last->dst_format.channels) / 8;
  		if (!in_kernel)
  			buf = runtime->oss.buffer;
  		frames = bytes / oss_frame_bytes;
  		frames1 = snd_pcm_plug_client_channels_buf(substream, buf, frames, &channels);
  		if (frames1 < 0)
  			return frames1;
  		frames1 = snd_pcm_plug_read_transfer(substream, channels, frames1);
  		if (frames1 <= 0)
  			return frames1;
  		bytes = frames1 * oss_frame_bytes;
  		if (!in_kernel && copy_to_user(final_dst, buf, bytes))
  			return -EFAULT;

  	} else
  #endif
  	{

  		frames = bytes_to_frames(runtime, bytes);
  		frames1 = snd_pcm_oss_read3(substream, buf, frames, in_kernel);
  		if (frames1 <= 0)
  			return frames1;
  		bytes = frames_to_bytes(runtime, frames1);
  	}
  	return bytes;
  }

  static ssize_t snd_pcm_oss_read1(struct snd_pcm_substream *substream, char __user *buf, size_t bytes)

  {
  	size_t xfer = 0;
  	ssize_t tmp;

  	struct snd_pcm_runtime *runtime = substream->runtime;

  	if (atomic_read(&substream->mmap_count))

  		return -ENXIO;
  
  	if ((tmp = snd_pcm_oss_make_ready(substream)) < 0)
  		return tmp;

  	mutex_lock(&runtime->oss.params_lock);

  	while (bytes > 0) {
  		if (bytes < runtime->oss.period_bytes || runtime->oss.buffer_used > 0) {
  			if (runtime->oss.buffer_used == 0) {
  				tmp = snd_pcm_oss_read2(substream, runtime->oss.buffer, runtime->oss.period_bytes, 1);
  				if (tmp <= 0)

  					goto err;

  				runtime->oss.bytes += tmp;
  				runtime->oss.period_ptr = tmp;
  				runtime->oss.buffer_used = tmp;
  			}
  			tmp = bytes;
  			if ((size_t) tmp > runtime->oss.buffer_used)
  				tmp = runtime->oss.buffer_used;

  			if (copy_to_user(buf, runtime->oss.buffer + (runtime->oss.period_ptr - runtime->oss.buffer_used), tmp)) {
  				tmp = -EFAULT;
  				goto err;
  			}

  			buf += tmp;
  			bytes -= tmp;
  			xfer += tmp;
  			runtime->oss.buffer_used -= tmp;
  		} else {

  			tmp = snd_pcm_oss_read2(substream, (char __force *)buf,
  						runtime->oss.period_bytes, 0);

  			if (tmp <= 0)

  				goto err;

  			runtime->oss.bytes += tmp;
  			buf += tmp;
  			bytes -= tmp;
  			xfer += tmp;
  		}
  	}

  	mutex_unlock(&runtime->oss.params_lock);

  	return xfer;

  
   err:
  	mutex_unlock(&runtime->oss.params_lock);
  	return xfer > 0 ? (snd_pcm_sframes_t)xfer : tmp;

  }

  static int snd_pcm_oss_reset(struct snd_pcm_oss_file *pcm_oss_file)

  {

  	struct snd_pcm_substream *substream;

  	struct snd_pcm_runtime *runtime;
  	int i;

  	for (i = 0; i < 2; i++) { 
  		substream = pcm_oss_file->streams[i];
  		if (!substream)
  			continue;
  		runtime = substream->runtime;

  		snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);

  		runtime->oss.prepare = 1;
  		runtime->oss.buffer_used = 0;
  		runtime->oss.prev_hw_ptr_period = 0;
  		runtime->oss.period_ptr = 0;

  	}
  	return 0;
  }

  static int snd_pcm_oss_post(struct snd_pcm_oss_file *pcm_oss_file)

  {

  	struct snd_pcm_substream *substream;

  	int err;
  
  	substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
  	if (substream != NULL) {
  		if ((err = snd_pcm_oss_make_ready(substream)) < 0)
  			return err;

  		snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_START, NULL);

  	}
  	/* note: all errors from the start action are ignored */
  	/* OSS apps do not know, how to handle them */
  	return 0;
  }

  static int snd_pcm_oss_sync1(struct snd_pcm_substream *substream, size_t size)

  {

  	struct snd_pcm_runtime *runtime;

  	ssize_t result = 0;

  	snd_pcm_state_t state;

  	long res;
  	wait_queue_t wait;
  
  	runtime = substream->runtime;
  	init_waitqueue_entry(&wait, current);
  	add_wait_queue(&runtime->sleep, &wait);
  #ifdef OSS_DEBUG

  	printk(KERN_DEBUG "sync1: size = %li
  ", size);

  #endif
  	while (1) {
  		result = snd_pcm_oss_write2(substream, runtime->oss.buffer, size, 1);
  		if (result > 0) {
  			runtime->oss.buffer_used = 0;
  			result = 0;
  			break;
  		}
  		if (result != 0 && result != -EAGAIN)
  			break;
  		result = 0;
  		set_current_state(TASK_INTERRUPTIBLE);
  		snd_pcm_stream_lock_irq(substream);

  		state = runtime->status->state;

  		snd_pcm_stream_unlock_irq(substream);

  		if (state != SNDRV_PCM_STATE_RUNNING) {

  			set_current_state(TASK_RUNNING);
  			break;
  		}
  		res = schedule_timeout(10 * HZ);
  		if (signal_pending(current)) {
  			result = -ERESTARTSYS;
  			break;
  		}
  		if (res == 0) {
  			snd_printk(KERN_ERR "OSS sync error - DMA timeout
  ");
  			result = -EIO;
  			break;
  		}
  	}
  	remove_wait_queue(&runtime->sleep, &wait);
  	return result;
  }

  static int snd_pcm_oss_sync(struct snd_pcm_oss_file *pcm_oss_file)

  {
  	int err = 0;
  	unsigned int saved_f_flags;

  	struct snd_pcm_substream *substream;
  	struct snd_pcm_runtime *runtime;

  	snd_pcm_format_t format;
  	unsigned long width;
  	size_t size;
  
  	substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
  	if (substream != NULL) {
  		runtime = substream->runtime;

  		if (atomic_read(&substream->mmap_count))

  			goto __direct;
  		if ((err = snd_pcm_oss_make_ready(substream)) < 0)
  			return err;
  		format = snd_pcm_oss_format_from(runtime->oss.format);
  		width = snd_pcm_format_physical_width(format);

  		mutex_lock(&runtime->oss.params_lock);

  		if (runtime->oss.buffer_used > 0) {
  #ifdef OSS_DEBUG

  			printk(KERN_DEBUG "sync: buffer_used
  ");

  #endif
  			size = (8 * (runtime->oss.period_bytes - runtime->oss.buffer_used) + 7) / width;
  			snd_pcm_format_set_silence(format,
  						   runtime->oss.buffer + runtime->oss.buffer_used,
  						   size);
  			err = snd_pcm_oss_sync1(substream, runtime->oss.period_bytes);

  			if (err < 0) {
  				mutex_unlock(&runtime->oss.params_lock);

  				return err;

  			}

  		} else if (runtime->oss.period_ptr > 0) {
  #ifdef OSS_DEBUG

  			printk(KERN_DEBUG "sync: period_ptr
  ");

  #endif
  			size = runtime->oss.period_bytes - runtime->oss.period_ptr;
  			snd_pcm_format_set_silence(format,
  						   runtime->oss.buffer,
  						   size * 8 / width);
  			err = snd_pcm_oss_sync1(substream, size);

  			if (err < 0) {
  				mutex_unlock(&runtime->oss.params_lock);

  				return err;

  			}

  		}
  		/*
  		 * The ALSA's period might be a bit large than OSS one.
  		 * Fill the remain portion of ALSA period with zeros.
  		 */
  		size = runtime->control->appl_ptr % runtime->period_size;
  		if (size > 0) {
  			size = runtime->period_size - size;
  			if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) {
  				size = (runtime->frame_bits * size) / 8;
  				while (size > 0) {
  					mm_segment_t fs;
  					size_t size1 = size < runtime->oss.period_bytes ? size : runtime->oss.period_bytes;
  					size -= size1;
  					size1 *= 8;
  					size1 /= runtime->sample_bits;
  					snd_pcm_format_set_silence(runtime->format,
  								   runtime->oss.buffer,
  								   size1);

  					size1 /= runtime->channels; /* frames */

  					fs = snd_enter_user();

  					snd_pcm_lib_write(substream, (void __force __user *)runtime->oss.buffer, size1);

  					snd_leave_user(fs);
  				}
  			} else if (runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) {
  				void __user *buffers[runtime->channels];
  				memset(buffers, 0, runtime->channels * sizeof(void *));
  				snd_pcm_lib_writev(substream, buffers, size);
  			}
  		}

  		mutex_unlock(&runtime->oss.params_lock);

  		/*
  		 * finish sync: drain the buffer
  		 */
  	      __direct:

  		saved_f_flags = substream->f_flags;
  		substream->f_flags &= ~O_NONBLOCK;

  		err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DRAIN, NULL);

  		substream->f_flags = saved_f_flags;

  		if (err < 0)
  			return err;
  		runtime->oss.prepare = 1;
  	}
  
  	substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
  	if (substream != NULL) {
  		if ((err = snd_pcm_oss_make_ready(substream)) < 0)
  			return err;
  		runtime = substream->runtime;

  		err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DROP, NULL);

  		if (err < 0)
  			return err;
  		runtime->oss.buffer_used = 0;
  		runtime->oss.prepare = 1;
  	}
  	return 0;
  }

  static int snd_pcm_oss_set_rate(struct snd_pcm_oss_file *pcm_oss_file, int rate)

  {
  	int idx;
  
  	for (idx = 1; idx >= 0; --idx) {

  		struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
  		struct snd_pcm_runtime *runtime;

  		if (substream == NULL)
  			continue;
  		runtime = substream->runtime;
  		if (rate < 1000)
  			rate = 1000;
  		else if (rate > 192000)
  			rate = 192000;
  		if (runtime->oss.rate != rate) {
  			runtime->oss.params = 1;
  			runtime->oss.rate = rate;
  		}
  	}
  	return snd_pcm_oss_get_rate(pcm_oss_file);
  }

  static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file)

  {

  	struct snd_pcm_substream *substream;

  	int err;
  	
  	if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
  		return err;
  	return substream->runtime->oss.rate;
  }

  static int snd_pcm_oss_set_channels(struct snd_pcm_oss_file *pcm_oss_file, unsigned int channels)

  {
  	int idx;
  	if (channels < 1)
  		channels = 1;
  	if (channels > 128)
  		return -EINVAL;
  	for (idx = 1; idx >= 0; --idx) {

  		struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
  		struct snd_pcm_runtime *runtime;

  		if (substream == NULL)
  			continue;
  		runtime = substream->runtime;
  		if (runtime->oss.channels != channels) {
  			runtime->oss.params = 1;
  			runtime->oss.channels = channels;
  		}
  	}
  	return snd_pcm_oss_get_channels(pcm_oss_file);
  }

  static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file)

  {

  	struct snd_pcm_substream *substream;

  	int err;
  	
  	if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
  		return err;
  	return substream->runtime->oss.channels;
  }

  static int snd_pcm_oss_get_block_size(struct snd_pcm_oss_file *pcm_oss_file)

  {

  	struct snd_pcm_substream *substream;

  	int err;
  	
  	if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
  		return err;
  	return substream->runtime->oss.period_bytes;
  }

  static int snd_pcm_oss_get_formats(struct snd_pcm_oss_file *pcm_oss_file)

  {

  	struct snd_pcm_substream *substream;

  	int err;
  	int direct;

  	struct snd_pcm_hw_params *params;

  	unsigned int formats = 0;

  	struct snd_mask format_mask;

  	int fmt;
  
  	if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
  		return err;

  	if (atomic_read(&substream->mmap_count))

  		direct = 1;

  	else
  		direct = substream->oss.setup.direct;

  	if (!direct)
  		return AFMT_MU_LAW | AFMT_U8 |
  		       AFMT_S16_LE | AFMT_S16_BE |
  		       AFMT_S8 | AFMT_U16_LE |

  		       AFMT_U16_BE |
  			AFMT_S32_LE | AFMT_S32_BE |

  			AFMT_S24_LE | AFMT_S24_BE |

  			AFMT_S24_PACKED;

  	params = kmalloc(sizeof(*params), GFP_KERNEL);
  	if (!params)
  		return -ENOMEM;
  	_snd_pcm_hw_params_any(params);
  	err = snd_pcm_hw_refine(substream, params);
  	format_mask = *hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 
  	kfree(params);

  	if (err < 0)
  		return err;

  	for (fmt = 0; fmt < 32; ++fmt) {
  		if (snd_mask_test(&format_mask, fmt)) {
  			int f = snd_pcm_oss_format_to(fmt);
  			if (f >= 0)
  				formats |= f;
  		}
  	}
  	return formats;
  }

  static int snd_pcm_oss_set_format(struct snd_pcm_oss_file *pcm_oss_file, int format)

  {
  	int formats, idx;
  	
  	if (format != AFMT_QUERY) {
  		formats = snd_pcm_oss_get_formats(pcm_oss_file);

  		if (formats < 0)
  			return formats;

  		if (!(formats & format))
  			format = AFMT_U8;
  		for (idx = 1; idx >= 0; --idx) {

  			struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];
  			struct snd_pcm_runtime *runtime;

  			if (substream == NULL)
  				continue;
  			runtime = substream->runtime;
  			if (runtime->oss.format != format) {
  				runtime->oss.params = 1;
  				runtime->oss.format = format;
  			}
  		}
  	}
  	return snd_pcm_oss_get_format(pcm_oss_file);
  }

  static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file)

  {

  	struct snd_pcm_substream *substream;

  	int err;
  	
  	if ((err = snd_pcm_oss_get_active_substream(pcm_oss_file, &substream)) < 0)
  		return err;
  	return substream->runtime->oss.format;
  }

  static int snd_pcm_oss_set_subdivide1(struct snd_pcm_substream *substream, int subdivide)

  {

  	struct snd_pcm_runtime *runtime;

  
  	if (substream == NULL)
  		return 0;
  	runtime = substream->runtime;
  	if (subdivide == 0) {
  		subdivide = runtime->oss.subdivision;
  		if (subdivide == 0)
  			subdivide = 1;
  		return subdivide;
  	}
  	if (runtime->oss.subdivision || runtime->oss.fragshift)
  		return -EINVAL;
  	if (subdivide != 1 && subdivide != 2 && subdivide != 4 &&
  	    subdivide != 8 && subdivide != 16)
  		return -EINVAL;
  	runtime->oss.subdivision = subdivide;
  	runtime->oss.params = 1;
  	return subdivide;
  }

  static int snd_pcm_oss_set_subdivide(struct snd_pcm_oss_file *pcm_oss_file, int subdivide)

  {
  	int err = -EINVAL, idx;
  
  	for (idx = 1; idx >= 0; --idx) {

  		struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];

  		if (substream == NULL)
  			continue;
  		if ((err = snd_pcm_oss_set_subdivide1(substream, subdivide)) < 0)
  			return err;
  	}
  	return err;
  }

  static int snd_pcm_oss_set_fragment1(struct snd_pcm_substream *substream, unsigned int val)

  {

  	struct snd_pcm_runtime *runtime;

  
  	if (substream == NULL)
  		return 0;
  	runtime = substream->runtime;
  	if (runtime->oss.subdivision || runtime->oss.fragshift)
  		return -EINVAL;
  	runtime->oss.fragshift = val & 0xffff;
  	runtime->oss.maxfrags = (val >> 16) & 0xffff;
  	if (runtime->oss.fragshift < 4)		/* < 16 */
  		runtime->oss.fragshift = 4;
  	if (runtime->oss.maxfrags < 2)
  		runtime->oss.maxfrags = 2;
  	runtime->oss.params = 1;
  	return 0;
  }

  static int snd_pcm_oss_set_fragment(struct snd_pcm_oss_file *pcm_oss_file, unsigned int val)

  {
  	int err = -EINVAL, idx;
  
  	for (idx = 1; idx >= 0; --idx) {

  		struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];

  		if (substream == NULL)
  			continue;
  		if ((err = snd_pcm_oss_set_fragment1(substream, val)) < 0)
  			return err;
  	}
  	return err;
  }
  
  static int snd_pcm_oss_nonblock(struct file * file)
  {

  	spin_lock(&file->f_lock);

  	file->f_flags |= O_NONBLOCK;

  	spin_unlock(&file->f_lock);

  	return 0;
  }

  static int snd_pcm_oss_get_caps1(struct snd_pcm_substream *substream, int res)

  {
  
  	if (substream == NULL) {
  		res &= ~DSP_CAP_DUPLEX;
  		return res;
  	}
  #ifdef DSP_CAP_MULTI
  	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
  		if (substream->pstr->substream_count > 1)
  			res |= DSP_CAP_MULTI;
  #endif
  	/* DSP_CAP_REALTIME is set all times: */
  	/* all ALSA drivers can return actual pointer in ring buffer */
  #if defined(DSP_CAP_REALTIME) && 0
  	{

  		struct snd_pcm_runtime *runtime = substream->runtime;

  		if (runtime->info & (SNDRV_PCM_INFO_BLOCK_TRANSFER|SNDRV_PCM_INFO_BATCH))
  			res &= ~DSP_CAP_REALTIME;
  	}
  #endif
  	return res;
  }

  static int snd_pcm_oss_get_caps(struct snd_pcm_oss_file *pcm_oss_file)

  {
  	int result, idx;
  	
  	result = DSP_CAP_TRIGGER | DSP_CAP_MMAP	| DSP_CAP_DUPLEX | DSP_CAP_REALTIME;
  	for (idx = 0; idx < 2; idx++) {

  		struct snd_pcm_substream *substream = pcm_oss_file->streams[idx];

  		result = snd_pcm_oss_get_caps1(substream, result);
  	}
  	result |= 0x0001;	/* revision - same as SB AWE 64 */
  	return result;
  }

  static void snd_pcm_oss_simulate_fill(struct snd_pcm_substream *substream,
  				      snd_pcm_uframes_t hw_ptr)

  {

  	struct snd_pcm_runtime *runtime = substream->runtime;

  	snd_pcm_uframes_t appl_ptr;
  	appl_ptr = hw_ptr + runtime->buffer_size;
  	appl_ptr %= runtime->boundary;
  	runtime->control->appl_ptr = appl_ptr;
  }

  static int snd_pcm_oss_set_trigger(struct snd_pcm_oss_file *pcm_oss_file, int trigger)

  {

  	struct snd_pcm_runtime *runtime;
  	struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;

  	int err, cmd;
  
  #ifdef OSS_DEBUG

  	printk(KERN_DEBUG "pcm_oss: trigger = 0x%x
  ", trigger);

  #endif
  	
  	psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
  	csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
  
  	if (psubstream) {
  		if ((err = snd_pcm_oss_make_ready(psubstream)) < 0)
  			return err;
  	}
  	if (csubstream) {
  		if ((err = snd_pcm_oss_make_ready(csubstream)) < 0)
  			return err;
  	}
        	if (psubstream) {
        		runtime = psubstream->runtime;
  		if (trigger & PCM_ENABLE_OUTPUT) {
  			if (runtime->oss.trigger)
  				goto _skip1;

  			if (atomic_read(&psubstream->mmap_count))

  				snd_pcm_oss_simulate_fill(psubstream,
  						get_hw_ptr_period(runtime));

  			runtime->oss.trigger = 1;
  			runtime->start_threshold = 1;
  			cmd = SNDRV_PCM_IOCTL_START;
  		} else {
  			if (!runtime->oss.trigger)
  				goto _skip1;
  			runtime->oss.trigger = 0;
  			runtime->start_threshold = runtime->boundary;
  			cmd = SNDRV_PCM_IOCTL_DROP;
  			runtime->oss.prepare = 1;
  		}

  		err = snd_pcm_kernel_ioctl(psubstream, cmd, NULL);

  		if (err < 0)
  			return err;
  	}
   _skip1:
  	if (csubstream) {
        		runtime = csubstream->runtime;
  		if (trigger & PCM_ENABLE_INPUT) {
  			if (runtime->oss.trigger)
  				goto _skip2;
  			runtime->oss.trigger = 1;
  			runtime->start_threshold = 1;
  			cmd = SNDRV_PCM_IOCTL_START;
  		} else {
  			if (!runtime->oss.trigger)
  				goto _skip2;
  			runtime->oss.trigger = 0;
  			runtime->start_threshold = runtime->boundary;
  			cmd = SNDRV_PCM_IOCTL_DROP;
  			runtime->oss.prepare = 1;
  		}

  		err = snd_pcm_kernel_ioctl(csubstream, cmd, NULL);

  		if (err < 0)
  			return err;
  	}
   _skip2:
  	return 0;
  }

  static int snd_pcm_oss_get_trigger(struct snd_pcm_oss_file *pcm_oss_file)

  {

  	struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;

  	int result = 0;
  
  	psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
  	csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
  	if (psubstream && psubstream->runtime && psubstream->runtime->oss.trigger)
  		result |= PCM_ENABLE_OUTPUT;
  	if (csubstream && csubstream->runtime && csubstream->runtime->oss.trigger)
  		result |= PCM_ENABLE_INPUT;
  	return result;
  }

  static int snd_pcm_oss_get_odelay(struct snd_pcm_oss_file *pcm_oss_file)

  {

  	struct snd_pcm_substream *substream;
  	struct snd_pcm_runtime *runtime;

  	snd_pcm_sframes_t delay;
  	int err;
  
  	substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
  	if (substream == NULL)
  		return -EINVAL;
  	if ((err = snd_pcm_oss_make_ready(substream)) < 0)
  		return err;
  	runtime = substream->runtime;
  	if (runtime->oss.params || runtime->oss.prepare)
  		return 0;

  	err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);

  	if (err == -EPIPE)
  		delay = 0;	/* hack for broken OSS applications */
  	else if (err < 0)
  		return err;
  	return snd_pcm_oss_bytes(substream, delay);
  }

  static int snd_pcm_oss_get_ptr(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct count_info __user * _info)

  {	

  	struct snd_pcm_substream *substream;
  	struct snd_pcm_runtime *runtime;

  	snd_pcm_sframes_t delay;
  	int fixup;
  	struct count_info info;
  	int err;
  
  	if (_info == NULL)
  		return -EFAULT;
  	substream = pcm_oss_file->streams[stream];
  	if (substream == NULL)
  		return -EINVAL;
  	if ((err = snd_pcm_oss_make_ready(substream)) < 0)
  		return err;
  	runtime = substream->runtime;
  	if (runtime->oss.params || runtime->oss.prepare) {
  		memset(&info, 0, sizeof(info));
  		if (copy_to_user(_info, &info, sizeof(info)))
  			return -EFAULT;
  		return 0;
  	}
  	if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
  		err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &delay);
  		if (err == -EPIPE || err == -ESTRPIPE || (! err && delay < 0)) {
  			err = 0;
  			delay = 0;
  			fixup = 0;
  		} else {
  			fixup = runtime->oss.buffer_used;
  		}
  	} else {
  		err = snd_pcm_oss_capture_position_fixup(substream, &delay);
  		fixup = -runtime->oss.buffer_used;
  	}
  	if (err < 0)
  		return err;
  	info.ptr = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr % runtime->buffer_size);

  	if (atomic_read(&substream->mmap_count)) {

  		snd_pcm_sframes_t n;

  		delay = get_hw_ptr_period(runtime);
  		n = delay - runtime->oss.prev_hw_ptr_period;

  		if (n < 0)
  			n += runtime->boundary;
  		info.blocks = n / runtime->period_size;

  		runtime->oss.prev_hw_ptr_period = delay;

  		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
  			snd_pcm_oss_simulate_fill(substream, delay);
  		info.bytes = snd_pcm_oss_bytes(substream, runtime->status->hw_ptr) & INT_MAX;
  	} else {

  		delay = snd_pcm_oss_bytes(substream, delay);

  		if (stream == SNDRV_PCM_STREAM_PLAYBACK) {

  			if (substream->oss.setup.buggyptr)

  				info.blocks = (runtime->oss.buffer_bytes - delay - fixup) / runtime->oss.period_bytes;
  			else
  				info.blocks = (delay + fixup) / runtime->oss.period_bytes;

  			info.bytes = (runtime->oss.bytes - delay) & INT_MAX;

  		} else {

  			delay += fixup;
  			info.blocks = delay / runtime->oss.period_bytes;

  			info.bytes = (runtime->oss.bytes + delay) & INT_MAX;

  		}

  	}
  	if (copy_to_user(_info, &info, sizeof(info)))
  		return -EFAULT;
  	return 0;
  }

  static int snd_pcm_oss_get_space(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct audio_buf_info __user *_info)

  {

  	struct snd_pcm_substream *substream;
  	struct snd_pcm_runtime *runtime;

  	snd_pcm_sframes_t avail;
  	int fixup;
  	struct audio_buf_info info;
  	int err;
  
  	if (_info == NULL)
  		return -EFAULT;
  	substream = pcm_oss_file->streams[stream];
  	if (substream == NULL)
  		return -EINVAL;
  	runtime = substream->runtime;
  
  	if (runtime->oss.params &&
  	    (err = snd_pcm_oss_change_params(substream)) < 0)
  		return err;
  
  	info.fragsize = runtime->oss.period_bytes;
  	info.fragstotal = runtime->periods;
  	if (runtime->oss.prepare) {
  		if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
  			info.bytes = runtime->oss.period_bytes * runtime->oss.periods;
  			info.fragments = runtime->oss.periods;
  		} else {
  			info.bytes = 0;
  			info.fragments = 0;
  		}
  	} else {
  		if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
  			err = snd_pcm_kernel_ioctl(substream, SNDRV_PCM_IOCTL_DELAY, &avail);
  			if (err == -EPIPE || err == -ESTRPIPE || (! err && avail < 0)) {
  				avail = runtime->buffer_size;
  				err = 0;
  				fixup = 0;
  			} else {
  				avail = runtime->buffer_size - avail;
  				fixup = -runtime->oss.buffer_used;
  			}
  		} else {
  			err = snd_pcm_oss_capture_position_fixup(substream, &avail);
  			fixup = runtime->oss.buffer_used;
  		}
  		if (err < 0)
  			return err;
  		info.bytes = snd_pcm_oss_bytes(substream, avail) + fixup;
  		info.fragments = info.bytes / runtime->oss.period_bytes;
  	}
  
  #ifdef OSS_DEBUG

  	printk(KERN_DEBUG "pcm_oss: space: bytes = %i, fragments = %i, "
  	       "fragstotal = %i, fragsize = %i
  ",
  	       info.bytes, info.fragments, info.fragstotal, info.fragsize);

  #endif
  	if (copy_to_user(_info, &info, sizeof(info)))
  		return -EFAULT;
  	return 0;
  }

  static int snd_pcm_oss_get_mapbuf(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct buffmem_desc __user * _info)

  {
  	// it won't be probably implemented
  	// snd_printd("TODO: snd_pcm_oss_get_mapbuf
  ");
  	return -EINVAL;
  }

  static const char *strip_task_path(const char *path)

  {

  	const char *ptr, *ptrl = NULL;
  	for (ptr = path; *ptr; ptr++) {

  		if (*ptr == '/')
  			ptrl = ptr + 1;

  	}

  	return ptrl;
  }
  
  static void snd_pcm_oss_look_for_setup(struct snd_pcm *pcm, int stream,
  				      const char *task_name,
  				      struct snd_pcm_oss_setup *rsetup)
  {
  	struct snd_pcm_oss_setup *setup;
  
  	mutex_lock(&pcm->streams[stream].oss.setup_mutex);
  	do {
  		for (setup = pcm->streams[stream].oss.setup_list; setup;
  		     setup = setup->next) {
  			if (!strcmp(setup->task_name, task_name))
  				goto out;

  		}

  	} while ((task_name = strip_task_path(task_name)) != NULL);
   out:
  	if (setup)
  		*rsetup = *setup;

  	mutex_unlock(&pcm->streams[stream].oss.setup_mutex);

  }

  static void snd_pcm_oss_release_substream(struct snd_pcm_substream *substream)
  {
  	struct snd_pcm_runtime *runtime;
  	runtime = substream->runtime;
  	vfree(runtime->oss.buffer);
  	runtime->oss.buffer = NULL;
  #ifdef CONFIG_SND_PCM_OSS_PLUGINS
  	snd_pcm_oss_plugin_clear(substream);
  #endif
  	substream->oss.oss = 0;
  }

  static void snd_pcm_oss_init_substream(struct snd_pcm_substream *substream,
  				       struct snd_pcm_oss_setup *setup,

  				       int minor)
  {

  	struct snd_pcm_runtime *runtime;

  
  	substream->oss.oss = 1;

  	substream->oss.setup = *setup;

  	if (setup->nonblock)

  		substream->f_flags |= O_NONBLOCK;

  	else if (setup->block)

  		substream->f_flags &= ~O_NONBLOCK;

  	runtime = substream->runtime;
  	runtime->oss.params = 1;
  	runtime->oss.trigger = 1;
  	runtime->oss.rate = 8000;

  	mutex_init(&runtime->oss.params_lock);

  	switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
  	case SNDRV_MINOR_OSS_PCM_8:
  		runtime->oss.format = AFMT_U8;
  		break;
  	case SNDRV_MINOR_OSS_PCM_16:
  		runtime->oss.format = AFMT_S16_LE;
  		break;
  	default:
  		runtime->oss.format = AFMT_MU_LAW;
  	}
  	runtime->oss.channels = 1;
  	runtime->oss.fragshift = 0;
  	runtime->oss.maxfrags = 0;
  	runtime->oss.subdivision = 0;

  	substream->pcm_release = snd_pcm_oss_release_substream;

  }

  static int snd_pcm_oss_release_file(struct snd_pcm_oss_file *pcm_oss_file)

  {
  	int cidx;

  	if (!pcm_oss_file)
  		return 0;

  	for (cidx = 0; cidx < 2; ++cidx) {

  		struct snd_pcm_substream *substream = pcm_oss_file->streams[cidx];

  		if (substream)
  			snd_pcm_release_substream(substream);

  	}
  	kfree(pcm_oss_file);
  	return 0;
  }
  
  static int snd_pcm_oss_open_file(struct file *file,

  				 struct snd_pcm *pcm,
  				 struct snd_pcm_oss_file **rpcm_oss_file,

  				 int minor,

  				 struct snd_pcm_oss_setup *setup)

  {

  	int idx, err;

  	struct snd_pcm_oss_file *pcm_oss_file;

  	struct snd_pcm_substream *substream;

  	fmode_t f_mode = file->f_mode;

  	if (rpcm_oss_file)
  		*rpcm_oss_file = NULL;

  	pcm_oss_file = kzalloc(sizeof(*pcm_oss_file), GFP_KERNEL);

  	if (pcm_oss_file == NULL)
  		return -ENOMEM;
  
  	if ((f_mode & (FMODE_WRITE|FMODE_READ)) == (FMODE_WRITE|FMODE_READ) &&
  	    (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX))
  		f_mode = FMODE_WRITE;

  	file->f_flags &= ~O_APPEND;

  	for (idx = 0; idx < 2; idx++) {

  		if (setup[idx].disable)

  			continue;

  		if (! pcm->streams[idx].substream_count)
  			continue; /* no matching substream */

  		if (idx == SNDRV_PCM_STREAM_PLAYBACK) {
  			if (! (f_mode & FMODE_WRITE))
  				continue;
  		} else {
  			if (! (f_mode & FMODE_READ))
  				continue;
  		}
  		err = snd_pcm_open_substream(pcm, idx, file, &substream);
  		if (err < 0) {

  			snd_pcm_oss_release_file(pcm_oss_file);
  			return err;
  		}

  
  		pcm_oss_file->streams[idx] = substream;

  		substream->file = pcm_oss_file;

  		snd_pcm_oss_init_substream(substream, &setup[idx], minor);

  	}
  	

  	if (!pcm_oss_file->streams[0] && !pcm_oss_file->streams[1]) {

  		snd_pcm_oss_release_file(pcm_oss_file);
  		return -EINVAL;
  	}

  
  	file->private_data = pcm_oss_file;

  	if (rpcm_oss_file)
  		*rpcm_oss_file = pcm_oss_file;

  	return 0;
  }

  static int snd_task_name(struct task_struct *task, char *name, size_t size)
  {
  	unsigned int idx;

  	if (snd_BUG_ON(!task || !name || size < 2))
  		return -EINVAL;

  	for (idx = 0; idx < sizeof(task->comm) && idx + 1 < size; idx++)
  		name[idx] = task->comm[idx];
  	name[idx] = '\0';
  	return 0;
  }

  static int snd_pcm_oss_open(struct inode *inode, struct file *file)
  {

  	int err;
  	char task_name[32];

  	struct snd_pcm *pcm;
  	struct snd_pcm_oss_file *pcm_oss_file;

  	struct snd_pcm_oss_setup setup[2];

  	int nonblock;
  	wait_queue_t wait;

  	err = nonseekable_open(inode, file);
  	if (err < 0)
  		return err;

  	pcm = snd_lookup_oss_minor_data(iminor(inode),
  					SNDRV_OSS_DEVICE_TYPE_PCM);

  	if (pcm == NULL) {
  		err = -ENODEV;
  		goto __error1;
  	}
  	err = snd_card_file_add(pcm->card, file);
  	if (err < 0)
  		goto __error1;
  	if (!try_module_get(pcm->card->module)) {
  		err = -EFAULT;
  		goto __error2;
  	}
  	if (snd_task_name(current, task_name, sizeof(task_name)) < 0) {
  		err = -EFAULT;
  		goto __error;
  	}

  	memset(setup, 0, sizeof(setup));

  	if (file->f_mode & FMODE_WRITE)

  		snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_PLAYBACK,
  					   task_name, &setup[0]);

  	if (file->f_mode & FMODE_READ)

  		snd_pcm_oss_look_for_setup(pcm, SNDRV_PCM_STREAM_CAPTURE,
  					   task_name, &setup[1]);

  
  	nonblock = !!(file->f_flags & O_NONBLOCK);

  	if (!nonblock)
  		nonblock = nonblock_open;
  
  	init_waitqueue_entry(&wait, current);
  	add_wait_queue(&pcm->open_wait, &wait);

  	mutex_lock(&pcm->open_mutex);

  	while (1) {
  		err = snd_pcm_oss_open_file(file, pcm, &pcm_oss_file,

  					    iminor(inode), setup);

  		if (err >= 0)
  			break;
  		if (err == -EAGAIN) {
  			if (nonblock) {
  				err = -EBUSY;
  				break;
  			}
  		} else
  			break;
  		set_current_state(TASK_INTERRUPTIBLE);

  		mutex_unlock(&pcm->open_mutex);

  		schedule();

  		mutex_lock(&pcm->open_mutex);

  		if (signal_pending(current)) {
  			err = -ERESTARTSYS;
  			break;
  		}
  	}
  	remove_wait_queue(&pcm->open_wait, &wait);

  	mutex_unlock(&pcm->open_mutex);

  	if (err < 0)
  		goto __error;
  	return err;
  
        __error:
       	module_put(pcm->card->module);
        __error2:
        	snd_card_file_remove(pcm->card, file);
        __error1:
  	return err;
  }
  
  static int snd_pcm_oss_release(struct inode *inode, struct file *file)
  {

  	struct snd_pcm *pcm;
  	struct snd_pcm_substream *substream;
  	struct snd_pcm_oss_file *pcm_oss_file;

  
  	pcm_oss_file = file->private_data;
  	substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
  	if (substream == NULL)
  		substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];

  	if (snd_BUG_ON(!substream))
  		return -ENXIO;

  	pcm = substream->pcm;

  	if (!pcm->card->shutdown)
  		snd_pcm_oss_sync(pcm_oss_file);

  	mutex_lock(&pcm->open_mutex);

  	snd_pcm_oss_release_file(pcm_oss_file);

  	mutex_unlock(&pcm->open_mutex);

  	wake_up(&pcm->open_wait);
  	module_put(pcm->card->module);
  	snd_card_file_remove(pcm->card, file);
  	return 0;
  }
  
  static long snd_pcm_oss_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
  {

  	struct snd_pcm_oss_file *pcm_oss_file;

  	int __user *p = (int __user *)arg;
  	int res;
  
  	pcm_oss_file = file->private_data;
  	if (cmd == OSS_GETVERSION)
  		return put_user(SNDRV_OSS_VERSION, p);
  	if (cmd == OSS_ALSAEMULVER)
  		return put_user(1, p);
  #if defined(CONFIG_SND_MIXER_OSS) || (defined(MODULE) && defined(CONFIG_SND_MIXER_OSS_MODULE))
  	if (((cmd >> 8) & 0xff) == 'M')	{	/* mixer ioctl - for OSS compatibility */

  		struct snd_pcm_substream *substream;

  		int idx;
  		for (idx = 0; idx < 2; ++idx) {
  			substream = pcm_oss_file->streams[idx];
  			if (substream != NULL)
  				break;
  		}

  		if (snd_BUG_ON(idx >= 2))
  			return -ENXIO;

  		return snd_mixer_oss_ioctl_card(substream->pcm->card, cmd, arg);
  	}
  #endif
  	if (((cmd >> 8) & 0xff) != 'P')
  		return -EINVAL;
  #ifdef OSS_DEBUG

  	printk(KERN_DEBUG "pcm_oss: ioctl = 0x%x
  ", cmd);

  #endif
  	switch (cmd) {
  	case SNDCTL_DSP_RESET:
  		return snd_pcm_oss_reset(pcm_oss_file);
  	case SNDCTL_DSP_SYNC:
  		return snd_pcm_oss_sync(pcm_oss_file);
  	case SNDCTL_DSP_SPEED:
  		if (get_user(res, p))
  			return -EFAULT;
  		if ((res = snd_pcm_oss_set_rate(pcm_oss_file, res))<0)
  			return res;
  		return put_user(res, p);
  	case SOUND_PCM_READ_RATE:
  		res = snd_pcm_oss_get_rate(pcm_oss_file);
  		if (res < 0)
  			return res;
  		return put_user(res, p);
  	case SNDCTL_DSP_STEREO:
  		if (get_user(res, p))
  			return -EFAULT;
  		res = res > 0 ? 2 : 1;
  		if ((res = snd_pcm_oss_set_channels(pcm_oss_file, res)) < 0)
  			return res;
  		return put_user(--res, p);
  	case SNDCTL_DSP_GETBLKSIZE:
  		res = snd_pcm_oss_get_block_size(pcm_oss_file);
  		if (res < 0)
  			return res;
  		return put_user(res, p);
  	case SNDCTL_DSP_SETFMT:
  		if (get_user(res, p))
  			return -EFAULT;
  		res = snd_pcm_oss_set_format(pcm_oss_file, res);
  		if (res < 0)
  			return res;
  		return put_user(res, p);
  	case SOUND_PCM_READ_BITS:
  		res = snd_pcm_oss_get_format(pcm_oss_file);
  		if (res < 0)
  			return res;
  		return put_user(res, p);
  	case SNDCTL_DSP_CHANNELS:
  		if (get_user(res, p))
  			return -EFAULT;
  		res = snd_pcm_oss_set_channels(pcm_oss_file, res);
  		if (res < 0)
  			return res;
  		return put_user(res, p);
  	case SOUND_PCM_READ_CHANNELS:
  		res = snd_pcm_oss_get_channels(pcm_oss_file);
  		if (res < 0)
  			return res;
  		return put_user(res, p);
  	case SOUND_PCM_WRITE_FILTER:
  	case SOUND_PCM_READ_FILTER:
  		return -EIO;
  	case SNDCTL_DSP_POST:
  		return snd_pcm_oss_post(pcm_oss_file);
  	case SNDCTL_DSP_SUBDIVIDE:
  		if (get_user(res, p))
  			return -EFAULT;
  		res = snd_pcm_oss_set_subdivide(pcm_oss_file, res);
  		if (res < 0)
  			return res;
  		return put_user(res, p);
  	case SNDCTL_DSP_SETFRAGMENT:
  		if (get_user(res, p))
  			return -EFAULT;
  		return snd_pcm_oss_set_fragment(pcm_oss_file, res);
  	case SNDCTL_DSP_GETFMTS:
  		res = snd_pcm_oss_get_formats(pcm_oss_file);
  		if (res < 0)
  			return res;
  		return put_user(res, p);
  	case SNDCTL_DSP_GETOSPACE:
  	case SNDCTL_DSP_GETISPACE:
  		return snd_pcm_oss_get_space(pcm_oss_file,
  			cmd == SNDCTL_DSP_GETISPACE ?
  				SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
  			(struct audio_buf_info __user *) arg);
  	case SNDCTL_DSP_NONBLOCK:
  		return snd_pcm_oss_nonblock(file);
  	case SNDCTL_DSP_GETCAPS:
  		res = snd_pcm_oss_get_caps(pcm_oss_file);
  		if (res < 0)
  			return res;
  		return put_user(res, p);
  	case SNDCTL_DSP_GETTRIGGER:
  		res = snd_pcm_oss_get_trigger(pcm_oss_file);
  		if (res < 0)
  			return res;
  		return put_user(res, p);
  	case SNDCTL_DSP_SETTRIGGER:
  		if (get_user(res, p))
  			return -EFAULT;
  		return snd_pcm_oss_set_trigger(pcm_oss_file, res);
  	case SNDCTL_DSP_GETIPTR:
  	case SNDCTL_DSP_GETOPTR:
  		return snd_pcm_oss_get_ptr(pcm_oss_file,
  			cmd == SNDCTL_DSP_GETIPTR ?
  				SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
  			(struct count_info __user *) arg);
  	case SNDCTL_DSP_MAPINBUF:
  	case SNDCTL_DSP_MAPOUTBUF:
  		return snd_pcm_oss_get_mapbuf(pcm_oss_file,
  			cmd == SNDCTL_DSP_MAPINBUF ?
  				SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK,
  			(struct buffmem_desc __user *) arg);
  	case SNDCTL_DSP_SETSYNCRO:
  		/* stop DMA now.. */
  		return 0;
  	case SNDCTL_DSP_SETDUPLEX:
  		if (snd_pcm_oss_get_caps(pcm_oss_file) & DSP_CAP_DUPLEX)
  			return 0;
  		return -EIO;
  	case SNDCTL_DSP_GETODELAY:
  		res = snd_pcm_oss_get_odelay(pcm_oss_file);
  		if (res < 0) {
  			/* it's for sure, some broken apps don't check for error codes */
  			put_user(0, p);
  			return res;
  		}
  		return put_user(res, p);
  	case SNDCTL_DSP_PROFILE:
  		return 0;	/* silently ignore */
  	default:
  		snd_printd("pcm_oss: unknown command = 0x%x
  ", cmd);
  	}
  	return -EINVAL;
  }
  
  #ifdef CONFIG_COMPAT
  /* all compatible */
  #define snd_pcm_oss_ioctl_compat	snd_pcm_oss_ioctl
  #else
  #define snd_pcm_oss_ioctl_compat	NULL
  #endif
  
  static ssize_t snd_pcm_oss_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
  {

  	struct snd_pcm_oss_file *pcm_oss_file;
  	struct snd_pcm_substream *substream;

  
  	pcm_oss_file = file->private_data;
  	substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
  	if (substream == NULL)
  		return -ENXIO;

  	substream->f_flags = file->f_flags & O_NONBLOCK;

  #ifndef OSS_DEBUG
  	return snd_pcm_oss_read1(substream, buf, count);
  #else
  	{
  		ssize_t res = snd_pcm_oss_read1(substream, buf, count);

  		printk(KERN_DEBUG "pcm_oss: read %li bytes "
  		       "(returned %li bytes)
  ", (long)count, (long)res);

  		return res;
  	}
  #endif
  }
  
  static ssize_t snd_pcm_oss_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
  {

  	struct snd_pcm_oss_file *pcm_oss_file;
  	struct snd_pcm_substream *substream;

  	long result;
  
  	pcm_oss_file = file->private_data;
  	substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
  	if (substream == NULL)
  		return -ENXIO;

  	substream->f_flags = file->f_flags & O_NONBLOCK;

  	result = snd_pcm_oss_write1(substream, buf, count);

  #ifdef OSS_DEBUG

  	printk(KERN_DEBUG "pcm_oss: write %li bytes (wrote %li bytes)
  ",
  	       (long)count, (long)result);

  #endif
  	return result;
  }

  static int snd_pcm_oss_playback_ready(struct snd_pcm_substream *substream)

  {

  	struct snd_pcm_runtime *runtime = substream->runtime;

  	if (atomic_read(&substream->mmap_count))

  		return runtime->oss.prev_hw_ptr_period !=
  						get_hw_ptr_period(runtime);

  	else

  		return snd_pcm_playback_avail(runtime) >=
  						runtime->oss.period_frames;

  }

  static int snd_pcm_oss_capture_ready(struct snd_pcm_substream *substream)

  {

  	struct snd_pcm_runtime *runtime = substream->runtime;

  	if (atomic_read(&substream->mmap_count))

  		return runtime->oss.prev_hw_ptr_period !=
  						get_hw_ptr_period(runtime);

  	else

  		return snd_pcm_capture_avail(runtime) >=
  						runtime->oss.period_frames;

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

  	struct snd_pcm_oss_file *pcm_oss_file;

  	unsigned int mask;

  	struct snd_pcm_substream *psubstream = NULL, *csubstream = NULL;

  	
  	pcm_oss_file = file->private_data;
  
  	psubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
  	csubstream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
  
  	mask = 0;
  	if (psubstream != NULL) {

  		struct snd_pcm_runtime *runtime = psubstream->runtime;

  		poll_wait(file, &runtime->sleep, wait);
  		snd_pcm_stream_lock_irq(psubstream);
  		if (runtime->status->state != SNDRV_PCM_STATE_DRAINING &&
  		    (runtime->status->state != SNDRV_PCM_STATE_RUNNING ||
  		     snd_pcm_oss_playback_ready(psubstream)))
  			mask |= POLLOUT | POLLWRNORM;
  		snd_pcm_stream_unlock_irq(psubstream);
  	}
  	if (csubstream != NULL) {

  		struct snd_pcm_runtime *runtime = csubstream->runtime;
  		snd_pcm_state_t ostate;

  		poll_wait(file, &runtime->sleep, wait);
  		snd_pcm_stream_lock_irq(csubstream);
  		if ((ostate = runtime->status->state) != SNDRV_PCM_STATE_RUNNING ||
  		    snd_pcm_oss_capture_ready(csubstream))
  			mask |= POLLIN | POLLRDNORM;
  		snd_pcm_stream_unlock_irq(csubstream);
  		if (ostate != SNDRV_PCM_STATE_RUNNING && runtime->oss.trigger) {

  			struct snd_pcm_oss_file ofile;

  			memset(&ofile, 0, sizeof(ofile));
  			ofile.streams[SNDRV_PCM_STREAM_CAPTURE] = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
  			runtime->oss.trigger = 0;
  			snd_pcm_oss_set_trigger(&ofile, PCM_ENABLE_INPUT);
  		}
  	}
  
  	return mask;
  }
  
  static int snd_pcm_oss_mmap(struct file *file, struct vm_area_struct *area)
  {

  	struct snd_pcm_oss_file *pcm_oss_file;
  	struct snd_pcm_substream *substream = NULL;
  	struct snd_pcm_runtime *runtime;

  	int err;
  
  #ifdef OSS_DEBUG

  	printk(KERN_DEBUG "pcm_oss: mmap begin
  ");

  #endif
  	pcm_oss_file = file->private_data;
  	switch ((area->vm_flags & (VM_READ | VM_WRITE))) {
  	case VM_READ | VM_WRITE:
  		substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
  		if (substream)
  			break;
  		/* Fall through */
  	case VM_READ:
  		substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_CAPTURE];
  		break;
  	case VM_WRITE:
  		substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
  		break;
  	default:
  		return -EINVAL;
  	}
  	/* set VM_READ access as well to fix memset() routines that do
  	   reads before writes (to improve performance) */
  	area->vm_flags |= VM_READ;
  	if (substream == NULL)
  		return -ENXIO;
  	runtime = substream->runtime;
  	if (!(runtime->info & SNDRV_PCM_INFO_MMAP_VALID))
  		return -EIO;
  	if (runtime->info & SNDRV_PCM_INFO_INTERLEAVED)
  		runtime->access = SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
  	else
  		return -EIO;
  	
  	if (runtime->oss.params) {
  		if ((err = snd_pcm_oss_change_params(substream)) < 0)
  			return err;
  	}

  #ifdef CONFIG_SND_PCM_OSS_PLUGINS

  	if (runtime->oss.plugin_first != NULL)
  		return -EIO;

  #endif

  
  	if (area->vm_pgoff != 0)
  		return -EINVAL;
  
  	err = snd_pcm_mmap_data(substream, file, area);
  	if (err < 0)
  		return err;
  	runtime->oss.mmap_bytes = area->vm_end - area->vm_start;
  	runtime->silence_threshold = 0;
  	runtime->silence_size = 0;
  #ifdef OSS_DEBUG

  	printk(KERN_DEBUG "pcm_oss: mmap ok, bytes = 0x%x
  ",
  	       runtime->oss.mmap_bytes);

  #endif
  	/* In mmap mode we never stop */
  	runtime->stop_threshold = runtime->boundary;
  
  	return 0;
  }

  #ifdef CONFIG_SND_VERBOSE_PROCFS

  /*
   *  /proc interface
   */

  static void snd_pcm_oss_proc_read(struct snd_info_entry *entry,
  				  struct snd_info_buffer *buffer)

  {

  	struct snd_pcm_str *pstr = entry->private_data;
  	struct snd_pcm_oss_setup *setup = pstr->oss.setup_list;

  	mutex_lock(&pstr->oss.setup_mutex);

  	while (setup) {
  		snd_iprintf(buffer, "%s %u %u%s%s%s%s%s%s
  ",
  			    setup->task_name,
  			    setup->periods,
  			    setup->period_size,
  			    setup->disable ? " disable" : "",
  			    setup->direct ? " direct" : "",
  			    setup->block ? " block" : "",
  			    setup->nonblock ? " non-block" : "",
  			    setup->partialfrag ? " partial-frag" : "",
  			    setup->nosilence ? " no-silence" : "");
  		setup = setup->next;
  	}

  	mutex_unlock(&pstr->oss.setup_mutex);

  }

  static void snd_pcm_oss_proc_free_setup_list(struct snd_pcm_str * pstr)

  {

  	struct snd_pcm_oss_setup *setup, *setupn;

  	for (setup = pstr->oss.setup_list, pstr->oss.setup_list = NULL;
  	     setup; setup = setupn) {
  		setupn = setup->next;
  		kfree(setup->task_name);
  		kfree(setup);
  	}
  	pstr->oss.setup_list = NULL;
  }

  static void snd_pcm_oss_proc_write(struct snd_info_entry *entry,
  				   struct snd_info_buffer *buffer)

  {

  	struct snd_pcm_str *pstr = entry->private_data;

  	char line[128], str[32], task_name[32];
  	const char *ptr;

  	int idx1;

  	struct snd_pcm_oss_setup *setup, *setup1, template;

  
  	while (!snd_info_get_line(buffer, line, sizeof(line))) {

  		mutex_lock(&pstr->oss.setup_mutex);

  		memset(&template, 0, sizeof(template));
  		ptr = snd_info_get_str(task_name, line, sizeof(task_name));
  		if (!strcmp(task_name, "clear") || !strcmp(task_name, "erase")) {
  			snd_pcm_oss_proc_free_setup_list(pstr);

  			mutex_unlock(&pstr->oss.setup_mutex);

  			continue;
  		}
  		for (setup = pstr->oss.setup_list; setup; setup = setup->next) {
  			if (!strcmp(setup->task_name, task_name)) {
  				template = *setup;
  				break;
  			}
  		}
  		ptr = snd_info_get_str(str, ptr, sizeof(str));
  		template.periods = simple_strtoul(str, NULL, 10);
  		ptr = snd_info_get_str(str, ptr, sizeof(str));
  		template.period_size = simple_strtoul(str, NULL, 10);
  		for (idx1 = 31; idx1 >= 0; idx1--)
  			if (template.period_size & (1 << idx1))
  				break;
  		for (idx1--; idx1 >= 0; idx1--)
  			template.period_size &= ~(1 << idx1);
  		do {
  			ptr = snd_info_get_str(str, ptr, sizeof(str));
  			if (!strcmp(str, "disable")) {
  				template.disable = 1;
  			} else if (!strcmp(str, "direct")) {
  				template.direct = 1;
  			} else if (!strcmp(str, "block")) {
  				template.block = 1;
  			} else if (!strcmp(str, "non-block")) {
  				template.nonblock = 1;
  			} else if (!strcmp(str, "partial-frag")) {
  				template.partialfrag = 1;
  			} else if (!strcmp(str, "no-silence")) {
  				template.nosilence = 1;

  			} else if (!strcmp(str, "buggy-ptr")) {
  				template.buggyptr = 1;

  			}
  		} while (*str);
  		if (setup == NULL) {

  			setup = kmalloc(sizeof(*setup), GFP_KERNEL);
  			if (! setup) {
  				buffer->error = -ENOMEM;

  				mutex_unlock(&pstr->oss.setup_mutex);

  				return;
  			}
  			if (pstr->oss.setup_list == NULL)
  				pstr->oss.setup_list = setup;
  			else {
  				for (setup1 = pstr->oss.setup_list;
  				     setup1->next; setup1 = setup1->next);
  				setup1->next = setup;
  			}
  			template.task_name = kstrdup(task_name, GFP_KERNEL);
  			if (! template.task_name) {
  				kfree(setup);

  				buffer->error = -ENOMEM;

  				mutex_unlock(&pstr->oss.setup_mutex);

  				return;

  			}
  		}

  		*setup = template;

  		mutex_unlock(&pstr->oss.setup_mutex);

  	}
  }

  static void snd_pcm_oss_proc_init(struct snd_pcm *pcm)

  {
  	int stream;
  	for (stream = 0; stream < 2; ++stream) {

  		struct snd_info_entry *entry;
  		struct snd_pcm_str *pstr = &pcm->streams[stream];

  		if (pstr->substream_count == 0)
  			continue;
  		if ((entry = snd_info_create_card_entry(pcm->card, "oss", pstr->proc_root)) != NULL) {
  			entry->content = SNDRV_INFO_CONTENT_TEXT;
  			entry->mode = S_IFREG | S_IRUGO | S_IWUSR;

  			entry->c.text.read = snd_pcm_oss_proc_read;

  			entry->c.text.write = snd_pcm_oss_proc_write;
  			entry->private_data = pstr;
  			if (snd_info_register(entry) < 0) {
  				snd_info_free_entry(entry);
  				entry = NULL;
  			}
  		}
  		pstr->oss.proc_entry = entry;
  	}
  }

  static void snd_pcm_oss_proc_done(struct snd_pcm *pcm)