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pcm.h

#ifndef __SOUND_PCM_H
#define __SOUND_PCM_H

/*
 *  Digital Audio (PCM) abstract layer
 *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
 *                   Abramo Bagnara <abramo@alsa-project.org>
 *
 *
 *   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
 *
 */

#include <sound/asound.h>
#include <sound/memalloc.h>
#include <linux/poll.h>
#include <linux/bitops.h>

typedef sndrv_pcm_uframes_t snd_pcm_uframes_t;
typedef sndrv_pcm_sframes_t snd_pcm_sframes_t;
typedef enum sndrv_pcm_class snd_pcm_class_t;
typedef enum sndrv_pcm_subclass snd_pcm_subclass_t;
typedef enum sndrv_pcm_stream snd_pcm_stream_t;
typedef enum sndrv_pcm_access snd_pcm_access_t;
typedef enum sndrv_pcm_format snd_pcm_format_t;
typedef enum sndrv_pcm_subformat snd_pcm_subformat_t;
typedef enum sndrv_pcm_state snd_pcm_state_t;
typedef union sndrv_pcm_sync_id snd_pcm_sync_id_t;
typedef struct sndrv_pcm_info snd_pcm_info_t;
typedef enum sndrv_pcm_hw_param snd_pcm_hw_param_t;
typedef struct sndrv_pcm_hw_params snd_pcm_hw_params_t;
typedef enum sndrv_pcm_start snd_pcm_start_t;
typedef enum sndrv_pcm_xrun snd_pcm_xrun_t;
typedef enum sndrv_pcm_tstamp snd_pcm_tstamp_t;
typedef struct sndrv_pcm_sw_params snd_pcm_sw_params_t;
typedef struct sndrv_pcm_channel_info snd_pcm_channel_info_t;
typedef struct sndrv_pcm_status snd_pcm_status_t;
typedef struct sndrv_pcm_mmap_status snd_pcm_mmap_status_t;
typedef struct sndrv_pcm_mmap_control snd_pcm_mmap_control_t;
typedef struct sndrv_mask snd_mask_t;
typedef struct snd_sg_buf snd_pcm_sgbuf_t;

#define snd_pcm_substream_chip(substream) ((substream)->private_data)
#define snd_pcm_chip(pcm) ((pcm)->private_data)

typedef struct _snd_pcm_file snd_pcm_file_t;
typedef struct _snd_pcm_runtime snd_pcm_runtime_t;

#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
#include "pcm_oss.h"
#endif

/*
 *  Hardware (lowlevel) section
 */

typedef struct _snd_pcm_hardware {
      unsigned int info;            /* SNDRV_PCM_INFO_* */
      u64 formats;                  /* SNDRV_PCM_FMTBIT_* */
      unsigned int rates;           /* SNDRV_PCM_RATE_* */
      unsigned int rate_min;        /* min rate */
      unsigned int rate_max;        /* max rate */
      unsigned int channels_min;    /* min channels */
      unsigned int channels_max;    /* max channels */
      size_t buffer_bytes_max;      /* max buffer size */
      size_t period_bytes_min;      /* min period size */
      size_t period_bytes_max;      /* max period size */
      unsigned int periods_min;     /* min # of periods */
      unsigned int periods_max;     /* max # of periods */
      size_t fifo_size;       /* fifo size in bytes */
} snd_pcm_hardware_t;

typedef struct _snd_pcm_ops {
      int (*open)(snd_pcm_substream_t *substream);
      int (*close)(snd_pcm_substream_t *substream);
      int (*ioctl)(snd_pcm_substream_t * substream,
                 unsigned int cmd, void *arg);
      int (*hw_params)(snd_pcm_substream_t * substream, snd_pcm_hw_params_t * params);
      int (*hw_free)(snd_pcm_substream_t *substream);
      int (*prepare)(snd_pcm_substream_t * substream);
      int (*trigger)(snd_pcm_substream_t * substream, int cmd);
      snd_pcm_uframes_t (*pointer)(snd_pcm_substream_t * substream);
      int (*copy)(snd_pcm_substream_t *substream, int channel, snd_pcm_uframes_t pos,
                void __user *buf, snd_pcm_uframes_t count);
      int (*silence)(snd_pcm_substream_t *substream, int channel, 
                   snd_pcm_uframes_t pos, snd_pcm_uframes_t count);
      struct page *(*page)(snd_pcm_substream_t *substream, unsigned long offset);
      int (*mmap)(snd_pcm_substream_t *substream, struct vm_area_struct *vma);
      int (*ack)(snd_pcm_substream_t *substream);
} snd_pcm_ops_t;

/*
 *
 */

#define SNDRV_PCM_DEVICES           8

#define SNDRV_PCM_IOCTL1_FALSE            ((void *)0)
#define SNDRV_PCM_IOCTL1_TRUE       ((void *)1)

#define SNDRV_PCM_IOCTL1_RESET            0
#define SNDRV_PCM_IOCTL1_INFO       1
#define SNDRV_PCM_IOCTL1_CHANNEL_INFO     2
#define SNDRV_PCM_IOCTL1_GSTATE           3

#define SNDRV_PCM_TRIGGER_STOP            0
#define SNDRV_PCM_TRIGGER_START           1
#define SNDRV_PCM_TRIGGER_PAUSE_PUSH      3
#define SNDRV_PCM_TRIGGER_PAUSE_RELEASE   4
#define SNDRV_PCM_TRIGGER_SUSPEND   5
#define SNDRV_PCM_TRIGGER_RESUME    6

#define SNDRV_PCM_POS_XRUN          ((snd_pcm_uframes_t)-1)

/* If you change this don't forget to change rates[] table in pcm_native.c */
#define SNDRV_PCM_RATE_5512         (1<<0)            /* 5512Hz */
#define SNDRV_PCM_RATE_8000         (1<<1)            /* 8000Hz */
#define SNDRV_PCM_RATE_11025        (1<<2)            /* 11025Hz */
#define SNDRV_PCM_RATE_16000        (1<<3)            /* 16000Hz */
#define SNDRV_PCM_RATE_22050        (1<<4)            /* 22050Hz */
#define SNDRV_PCM_RATE_32000        (1<<5)            /* 32000Hz */
#define SNDRV_PCM_RATE_44100        (1<<6)            /* 44100Hz */
#define SNDRV_PCM_RATE_48000        (1<<7)            /* 48000Hz */
#define SNDRV_PCM_RATE_64000        (1<<8)            /* 64000Hz */
#define SNDRV_PCM_RATE_88200        (1<<9)            /* 88200Hz */
#define SNDRV_PCM_RATE_96000        (1<<10)           /* 96000Hz */
#define SNDRV_PCM_RATE_176400       (1<<11)           /* 176400Hz */
#define SNDRV_PCM_RATE_192000       (1<<12)           /* 192000Hz */

#define SNDRV_PCM_RATE_CONTINUOUS   (1<<30)           /* continuous range */
#define SNDRV_PCM_RATE_KNOT         (1<<31)           /* supports more non-continuos rates */

#define SNDRV_PCM_RATE_8000_44100   (SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_11025|\
                               SNDRV_PCM_RATE_16000|SNDRV_PCM_RATE_22050|\
                               SNDRV_PCM_RATE_32000|SNDRV_PCM_RATE_44100)
#define SNDRV_PCM_RATE_8000_48000   (SNDRV_PCM_RATE_8000_44100|SNDRV_PCM_RATE_48000)
#define SNDRV_PCM_RATE_8000_96000   (SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_64000|\
                               SNDRV_PCM_RATE_88200|SNDRV_PCM_RATE_96000)
#define SNDRV_PCM_RATE_8000_192000  (SNDRV_PCM_RATE_8000_96000|SNDRV_PCM_RATE_176400|\
                               SNDRV_PCM_RATE_192000)
#define SNDRV_PCM_FMTBIT_S8         (1ULL << SNDRV_PCM_FORMAT_S8)
#define SNDRV_PCM_FMTBIT_U8         (1ULL << SNDRV_PCM_FORMAT_U8)
#define SNDRV_PCM_FMTBIT_S16_LE           (1ULL << SNDRV_PCM_FORMAT_S16_LE)
#define SNDRV_PCM_FMTBIT_S16_BE           (1ULL << SNDRV_PCM_FORMAT_S16_BE)
#define SNDRV_PCM_FMTBIT_U16_LE           (1ULL << SNDRV_PCM_FORMAT_U16_LE)
#define SNDRV_PCM_FMTBIT_U16_BE           (1ULL << SNDRV_PCM_FORMAT_U16_BE)
#define SNDRV_PCM_FMTBIT_S24_LE           (1ULL << SNDRV_PCM_FORMAT_S24_LE)
#define SNDRV_PCM_FMTBIT_S24_BE           (1ULL << SNDRV_PCM_FORMAT_S24_BE)
#define SNDRV_PCM_FMTBIT_U24_LE           (1ULL << SNDRV_PCM_FORMAT_U24_LE)
#define SNDRV_PCM_FMTBIT_U24_BE           (1ULL << SNDRV_PCM_FORMAT_U24_BE)
#define SNDRV_PCM_FMTBIT_S32_LE           (1ULL << SNDRV_PCM_FORMAT_S32_LE)
#define SNDRV_PCM_FMTBIT_S32_BE           (1ULL << SNDRV_PCM_FORMAT_S32_BE)
#define SNDRV_PCM_FMTBIT_U32_LE           (1ULL << SNDRV_PCM_FORMAT_U32_LE)
#define SNDRV_PCM_FMTBIT_U32_BE           (1ULL << SNDRV_PCM_FORMAT_U32_BE)
#define SNDRV_PCM_FMTBIT_FLOAT_LE   (1ULL << SNDRV_PCM_FORMAT_FLOAT_LE)
#define SNDRV_PCM_FMTBIT_FLOAT_BE   (1ULL << SNDRV_PCM_FORMAT_FLOAT_BE)
#define SNDRV_PCM_FMTBIT_FLOAT64_LE (1ULL << SNDRV_PCM_FORMAT_FLOAT64_LE)
#define SNDRV_PCM_FMTBIT_FLOAT64_BE (1ULL << SNDRV_PCM_FORMAT_FLOAT64_BE)
#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE (1ULL << SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE)
#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE (1ULL << SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE)
#define SNDRV_PCM_FMTBIT_MU_LAW           (1ULL << SNDRV_PCM_FORMAT_MU_LAW)
#define SNDRV_PCM_FMTBIT_A_LAW            (1ULL << SNDRV_PCM_FORMAT_A_LAW)
#define SNDRV_PCM_FMTBIT_IMA_ADPCM  (1ULL << SNDRV_PCM_FORMAT_IMA_ADPCM)
#define SNDRV_PCM_FMTBIT_MPEG       (1ULL << SNDRV_PCM_FORMAT_MPEG)
#define SNDRV_PCM_FMTBIT_GSM        (1ULL << SNDRV_PCM_FORMAT_GSM)
#define SNDRV_PCM_FMTBIT_SPECIAL    (1ULL << SNDRV_PCM_FORMAT_SPECIAL)
#define SNDRV_PCM_FMTBIT_S24_3LE    (1ULL << SNDRV_PCM_FORMAT_S24_3LE)
#define SNDRV_PCM_FMTBIT_U24_3LE    (1ULL << SNDRV_PCM_FORMAT_U24_3LE)
#define SNDRV_PCM_FMTBIT_S24_3BE    (1ULL << SNDRV_PCM_FORMAT_S24_3BE)
#define SNDRV_PCM_FMTBIT_U24_3BE    (1ULL << SNDRV_PCM_FORMAT_U24_3BE)
#define SNDRV_PCM_FMTBIT_S20_3LE    (1ULL << SNDRV_PCM_FORMAT_S20_3LE)
#define SNDRV_PCM_FMTBIT_U20_3LE    (1ULL << SNDRV_PCM_FORMAT_U20_3LE)
#define SNDRV_PCM_FMTBIT_S20_3BE    (1ULL << SNDRV_PCM_FORMAT_S20_3BE)
#define SNDRV_PCM_FMTBIT_U20_3BE    (1ULL << SNDRV_PCM_FORMAT_U20_3BE)
#define SNDRV_PCM_FMTBIT_S18_3LE    (1ULL << SNDRV_PCM_FORMAT_S18_3LE)
#define SNDRV_PCM_FMTBIT_U18_3LE    (1ULL << SNDRV_PCM_FORMAT_U18_3LE)
#define SNDRV_PCM_FMTBIT_S18_3BE    (1ULL << SNDRV_PCM_FORMAT_S18_3BE)
#define SNDRV_PCM_FMTBIT_U18_3BE    (1ULL << SNDRV_PCM_FORMAT_U18_3BE)

#ifdef SNDRV_LITTLE_ENDIAN
#define SNDRV_PCM_FMTBIT_S16        SNDRV_PCM_FMTBIT_S16_LE
#define SNDRV_PCM_FMTBIT_U16        SNDRV_PCM_FMTBIT_U16_LE
#define SNDRV_PCM_FMTBIT_S24        SNDRV_PCM_FMTBIT_S24_LE
#define SNDRV_PCM_FMTBIT_U24        SNDRV_PCM_FMTBIT_U24_LE
#define SNDRV_PCM_FMTBIT_S32        SNDRV_PCM_FMTBIT_S32_LE
#define SNDRV_PCM_FMTBIT_U32        SNDRV_PCM_FMTBIT_U32_LE
#define SNDRV_PCM_FMTBIT_FLOAT            SNDRV_PCM_FMTBIT_FLOAT_LE
#define SNDRV_PCM_FMTBIT_FLOAT64    SNDRV_PCM_FMTBIT_FLOAT64_LE
#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE
#endif
#ifdef SNDRV_BIG_ENDIAN
#define SNDRV_PCM_FMTBIT_S16        SNDRV_PCM_FMTBIT_S16_BE
#define SNDRV_PCM_FMTBIT_U16        SNDRV_PCM_FMTBIT_U16_BE
#define SNDRV_PCM_FMTBIT_S24        SNDRV_PCM_FMTBIT_S24_BE
#define SNDRV_PCM_FMTBIT_U24        SNDRV_PCM_FMTBIT_U24_BE
#define SNDRV_PCM_FMTBIT_S32        SNDRV_PCM_FMTBIT_S32_BE
#define SNDRV_PCM_FMTBIT_U32        SNDRV_PCM_FMTBIT_U32_BE
#define SNDRV_PCM_FMTBIT_FLOAT            SNDRV_PCM_FMTBIT_FLOAT_BE
#define SNDRV_PCM_FMTBIT_FLOAT64    SNDRV_PCM_FMTBIT_FLOAT64_BE
#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE
#endif

struct _snd_pcm_file {
      snd_pcm_substream_t * substream;
      struct _snd_pcm_file * next;
};

typedef struct _snd_pcm_hw_rule snd_pcm_hw_rule_t;

typedef int (*snd_pcm_hw_rule_func_t)(snd_pcm_hw_params_t *params,
                              snd_pcm_hw_rule_t *rule);

struct _snd_pcm_hw_rule {
      unsigned int cond;
      snd_pcm_hw_rule_func_t func;
      int var;
      int deps[4];
      void *private;
};

typedef struct _snd_pcm_hw_constraints {
      snd_mask_t masks[SNDRV_PCM_HW_PARAM_LAST_MASK - 
                   SNDRV_PCM_HW_PARAM_FIRST_MASK + 1];
      snd_interval_t intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL -
                       SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
      unsigned int rules_num;
      unsigned int rules_all;
      snd_pcm_hw_rule_t *rules;
} snd_pcm_hw_constraints_t;

static inline snd_mask_t *constrs_mask(snd_pcm_hw_constraints_t *constrs,
                               snd_pcm_hw_param_t var)
{
      return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
}

static inline snd_interval_t *constrs_interval(snd_pcm_hw_constraints_t *constrs,
                                snd_pcm_hw_param_t var)
{
      return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
}

typedef struct {
      unsigned int num;
      unsigned int den_min, den_max, den_step;
} ratnum_t;

typedef struct {
      unsigned int num_min, num_max, num_step;
      unsigned int den;
} ratden_t;

typedef struct {
      int nrats;
      ratnum_t *rats;
} snd_pcm_hw_constraint_ratnums_t;

typedef struct {
      int nrats;
      ratden_t *rats;
} snd_pcm_hw_constraint_ratdens_t;

typedef struct {
      unsigned int count;
      unsigned int *list;
      unsigned int mask;
} snd_pcm_hw_constraint_list_t;

struct _snd_pcm_runtime {
      /* -- Status -- */
      snd_pcm_substream_t *trigger_master;
      snd_timestamp_t trigger_tstamp;     /* trigger timestamp */
      int overrange;
      snd_pcm_uframes_t avail_max;
      snd_pcm_uframes_t hw_ptr_base;      /* Position at buffer restart */
      snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time*/

      /* -- HW params -- */
      snd_pcm_access_t access;      /* access mode */
      snd_pcm_format_t format;      /* SNDRV_PCM_FORMAT_* */
      snd_pcm_subformat_t subformat;      /* subformat */
      unsigned int rate;            /* rate in Hz */
      unsigned int channels;        /* channels */
      snd_pcm_uframes_t period_size;      /* period size */
      unsigned int periods;         /* periods */
      snd_pcm_uframes_t buffer_size;      /* buffer size */
      unsigned int tick_time;       /* tick time */
      snd_pcm_uframes_t min_align;  /* Min alignment for the format */
      size_t byte_align;
      unsigned int frame_bits;
      unsigned int sample_bits;
      unsigned int info;
      unsigned int rate_num;
      unsigned int rate_den;

      /* -- SW params -- */
      int tstamp_timespec;          /* use timeval (0) or timespec (1) */
      snd_pcm_tstamp_t tstamp_mode; /* mmap timestamp is updated */
      unsigned int period_step;
      unsigned int sleep_min;       /* min ticks to sleep */
      snd_pcm_uframes_t xfer_align; /* xfer size need to be a multiple */
      snd_pcm_uframes_t start_threshold;
      snd_pcm_uframes_t stop_threshold;
      snd_pcm_uframes_t silence_threshold; /* Silence filling happens when
                                    noise is nearest than this */
      snd_pcm_uframes_t silence_size;     /* Silence filling size */
      snd_pcm_uframes_t boundary;   /* pointers wrap point */

      snd_pcm_uframes_t silence_start; /* starting pointer to silence area */
      snd_pcm_uframes_t silence_filled; /* size filled with silence */

      snd_pcm_sync_id_t sync;       /* hardware synchronization ID */

      /* -- mmap -- */
      volatile snd_pcm_mmap_status_t *status;
      volatile snd_pcm_mmap_control_t *control;
      atomic_t mmap_count;

      /* -- locking / scheduling -- */
      wait_queue_head_t sleep;
      struct timer_list tick_timer;
      struct fasync_struct *fasync;

      /* -- private section -- */
      void *private_data;
      void (*private_free)(snd_pcm_runtime_t *runtime);

      /* -- hardware description -- */
      snd_pcm_hardware_t hw;
      snd_pcm_hw_constraints_t hw_constraints;

      /* -- interrupt callbacks -- */
      void (*transfer_ack_begin)(snd_pcm_substream_t *substream);
      void (*transfer_ack_end)(snd_pcm_substream_t *substream);

      /* -- timer -- */
      unsigned int timer_resolution;      /* timer resolution */

      /* -- DMA -- */           
      unsigned char *dma_area;      /* DMA area */
      dma_addr_t dma_addr;          /* physical bus address (not accessible from main CPU) */
      size_t dma_bytes;       /* size of DMA area */

      struct snd_dma_buffer *dma_buffer_p;      /* allocated buffer */

#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
      /* -- OSS things -- */
      snd_pcm_oss_runtime_t oss;
#endif
};

typedef struct _snd_pcm_group {           /* keep linked substreams */
      spinlock_t lock;
      struct list_head substreams;
      int count;
} snd_pcm_group_t;

struct _snd_pcm_substream {
      snd_pcm_t *pcm;
      snd_pcm_str_t *pstr;
      void *private_data;           /* copied from pcm->private_data */
      int number;
      char name[32];                /* substream name */
      int stream;             /* stream (direction) */
      size_t buffer_bytes_max;      /* limit ring buffer size */
      struct snd_dma_buffer dma_buffer;
      unsigned int dma_buf_id;
      size_t dma_max;
      /* -- hardware operations -- */
      unsigned int open_flag: 1;    /* lowlevel device has been opened */
      snd_pcm_ops_t *ops;
      /* -- runtime information -- */
      snd_pcm_runtime_t *runtime;
        /* -- timer section -- */
      snd_timer_t *timer;           /* timer */
      unsigned timer_running: 1;    /* time is running */
      spinlock_t timer_lock;
      /* -- next substream -- */
      snd_pcm_substream_t *next;
      /* -- linked substreams -- */
      struct list_head link_list;   /* linked list member */
      snd_pcm_group_t self_group;   /* fake group for non linked substream (with substream lock inside) */
      snd_pcm_group_t *group;       /* pointer to current group */
      /* -- assigned files -- */
      snd_pcm_file_t *file;
      struct file *ffile;
#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
      /* -- OSS things -- */
      snd_pcm_oss_substream_t oss;
#endif
      snd_info_entry_t *proc_root;
      snd_info_entry_t *proc_info_entry;
      snd_info_entry_t *proc_hw_params_entry;
      snd_info_entry_t *proc_sw_params_entry;
      snd_info_entry_t *proc_status_entry;
      snd_info_entry_t *proc_prealloc_entry;
      /* misc flags */
      unsigned int no_mmap_ctrl: 1;
};

#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
#define SUBSTREAM_BUSY(substream) ((substream)->file != NULL || ((substream)->oss.file != NULL))
#else
#define SUBSTREAM_BUSY(substream) ((substream)->file != NULL)
#endif


struct _snd_pcm_str {
      int stream;                   /* stream (direction) */
      snd_pcm_t *pcm;
      /* -- substreams -- */
      unsigned int substream_count;
      unsigned int substream_opened;
      snd_pcm_substream_t *substream;
#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
      /* -- OSS things -- */
      snd_pcm_oss_stream_t oss;
#endif
      snd_pcm_file_t *files;
      snd_minor_t *reg;
      snd_info_entry_t *proc_root;
      snd_info_entry_t *proc_info_entry;
#ifdef CONFIG_SND_DEBUG
      unsigned int xrun_debug;      /* 0 = disabled, 1 = verbose, 2 = stacktrace */
      snd_info_entry_t *proc_xrun_debug_entry;
#endif
};

struct _snd_pcm {
      snd_card_t *card;
      unsigned int device;    /* device number */
      unsigned int info_flags;
      unsigned short dev_class;
      unsigned short dev_subclass;
      char id[64];
      char name[80];
      snd_pcm_str_t streams[2];
      struct semaphore open_mutex;
      wait_queue_head_t open_wait;
      void *private_data;
      void (*private_free) (snd_pcm_t *pcm);
#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
      snd_pcm_oss_t oss;
#endif
};

typedef struct _snd_pcm_notify {
      int (*n_register) (snd_pcm_t * pcm);
      int (*n_disconnect) (snd_pcm_t * pcm);
      int (*n_unregister) (snd_pcm_t * pcm);
      struct list_head list;
} snd_pcm_notify_t;

/*
 *  Registering
 */

extern snd_pcm_t *snd_pcm_devices[];
extern snd_minor_t snd_pcm_reg[2];

int snd_pcm_new(snd_card_t * card, char *id, int device,
            int playback_count, int capture_count,
            snd_pcm_t **rpcm);
int snd_pcm_new_stream(snd_pcm_t *pcm, int stream, int substream_count);

int snd_pcm_notify(snd_pcm_notify_t *notify, int nfree);

/*
 *  Native I/O
 */

extern rwlock_t snd_pcm_link_rwlock;

int snd_pcm_info(snd_pcm_substream_t * substream, snd_pcm_info_t *info);
int snd_pcm_info_user(snd_pcm_substream_t * substream, snd_pcm_info_t __user *info);
int snd_pcm_status(snd_pcm_substream_t * substream, snd_pcm_status_t *status);
int snd_pcm_prepare(snd_pcm_substream_t *substream);
int snd_pcm_start(snd_pcm_substream_t *substream);
int snd_pcm_stop(snd_pcm_substream_t *substream, int status);
int snd_pcm_drain_done(snd_pcm_substream_t *substream);
#ifdef CONFIG_PM
int snd_pcm_suspend(snd_pcm_substream_t *substream);
int snd_pcm_suspend_all(snd_pcm_t *pcm);
#endif
int snd_pcm_kernel_playback_ioctl(snd_pcm_substream_t *substream, unsigned int cmd, void *arg);
int snd_pcm_kernel_capture_ioctl(snd_pcm_substream_t *substream, unsigned int cmd, void *arg);
int snd_pcm_kernel_ioctl(snd_pcm_substream_t *substream, unsigned int cmd, void *arg);
int snd_pcm_open_substream(snd_pcm_t *pcm, int stream, snd_pcm_substream_t **rsubstream);
void snd_pcm_release_substream(snd_pcm_substream_t *substream);
void snd_pcm_vma_notify_data(void *client, void *data);
int snd_pcm_mmap_data(snd_pcm_substream_t *substream, struct file *file, struct vm_area_struct *area);

#if BITS_PER_LONG >= 64

static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
{
      *rem = *n % div;
      *n /= div;
}

#elif defined(i386)

static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
{
      u_int32_t low, high;
      low = *n & 0xffffffff;
      high = *n >> 32;
      if (high) {
            u_int32_t high1 = high % div;
            high /= div;
            asm("divl %2":"=a" (low), "=d" (*rem):"rm" (div), "a" (low), "d" (high1));
            *n = (u_int64_t)high << 32 | low;
      } else {
            *n = low / div;
            *rem = low % div;
      }
}
#else

static inline void divl(u_int32_t high, u_int32_t low,
                  u_int32_t div,
                  u_int32_t *q, u_int32_t *r)
{
      u_int64_t n = (u_int64_t)high << 32 | low;
      u_int64_t d = (u_int64_t)div << 31;
      u_int32_t q1 = 0;
      int c = 32;
      while (n > 0xffffffffU) {
            q1 <<= 1;
            if (n >= d) {
                  n -= d;
                  q1 |= 1;
            }
            d >>= 1;
            c--;
      }
      q1 <<= c;
      if (n) {
            low = n;
            *q = q1 | (low / div);
            *r = low % div;
      } else {
            *r = 0;
            *q = q1;
      }
      return;
}

static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
{
      u_int32_t low, high;
      low = *n & 0xffffffff;
      high = *n >> 32;
      if (high) {
            u_int32_t high1 = high % div;
            u_int32_t low1 = low;
            high /= div;
            divl(high1, low1, div, &low, rem);
            *n = (u_int64_t)high << 32 | low;
      } else {
            *n = low / div;
            *rem = low % div;
      }
}
#endif

/*
 *  PCM library
 */

static inline int snd_pcm_stream_linked(snd_pcm_substream_t *substream)
{
      return substream->group != &substream->self_group;
}

static inline void snd_pcm_stream_lock(snd_pcm_substream_t *substream)
{
      read_lock(&snd_pcm_link_rwlock);
      spin_lock(&substream->self_group.lock);
}

static inline void snd_pcm_stream_unlock(snd_pcm_substream_t *substream)
{
      spin_unlock(&substream->self_group.lock);
      read_unlock(&snd_pcm_link_rwlock);
}

static inline void snd_pcm_stream_lock_irq(snd_pcm_substream_t *substream)
{
      read_lock_irq(&snd_pcm_link_rwlock);
      spin_lock(&substream->self_group.lock);
}

static inline void snd_pcm_stream_unlock_irq(snd_pcm_substream_t *substream)
{
      spin_unlock(&substream->self_group.lock);
      read_unlock_irq(&snd_pcm_link_rwlock);
}

#define snd_pcm_stream_lock_irqsave(substream, flags) \
do { \
      read_lock_irqsave(&snd_pcm_link_rwlock, (flags)); \
      spin_lock(&substream->self_group.lock); \
} while (0)

#define snd_pcm_stream_unlock_irqrestore(substream, flags) \
do { \
      spin_unlock(&substream->self_group.lock); \
      read_unlock_irqrestore(&snd_pcm_link_rwlock, (flags)); \
} while (0)

#define snd_pcm_group_for_each(pos, substream) \
      list_for_each(pos, &substream->group->substreams)

#define snd_pcm_group_substream_entry(pos) \
      list_entry(pos, snd_pcm_substream_t, link_list)

static inline int snd_pcm_running(snd_pcm_substream_t *substream)
{
      return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
            (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
             substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
}

static inline ssize_t bytes_to_samples(snd_pcm_runtime_t *runtime, ssize_t size)
{
      return size * 8 / runtime->sample_bits;
}

static inline snd_pcm_sframes_t bytes_to_frames(snd_pcm_runtime_t *runtime, ssize_t size)
{
      return size * 8 / runtime->frame_bits;
}

static inline ssize_t samples_to_bytes(snd_pcm_runtime_t *runtime, ssize_t size)
{
      return size * runtime->sample_bits / 8;
}

static inline ssize_t frames_to_bytes(snd_pcm_runtime_t *runtime, snd_pcm_sframes_t size)
{
      return size * runtime->frame_bits / 8;
}

static inline int frame_aligned(snd_pcm_runtime_t *runtime, ssize_t bytes)
{
      return bytes % runtime->byte_align == 0;
}

static inline size_t snd_pcm_lib_buffer_bytes(snd_pcm_substream_t *substream)
{
      snd_pcm_runtime_t *runtime = substream->runtime;
      return frames_to_bytes(runtime, runtime->buffer_size);
}

static inline size_t snd_pcm_lib_period_bytes(snd_pcm_substream_t *substream)
{
      snd_pcm_runtime_t *runtime = substream->runtime;
      return frames_to_bytes(runtime, runtime->period_size);
}

/*
 *  result is: 0 ... (boundary - 1)
 */
static inline snd_pcm_uframes_t snd_pcm_playback_avail(snd_pcm_runtime_t *runtime)
{
      snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
      if (avail < 0)
            avail += runtime->boundary;
      else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
            avail -= runtime->boundary;
      return avail;
}

/*
 *  result is: 0 ... (boundary - 1)
 */
static inline snd_pcm_uframes_t snd_pcm_capture_avail(snd_pcm_runtime_t *runtime)
{
      snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
      if (avail < 0)
            avail += runtime->boundary;
      return avail;
}

static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(snd_pcm_runtime_t *runtime)
{
      return runtime->buffer_size - snd_pcm_playback_avail(runtime);
}

static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(snd_pcm_runtime_t *runtime)
{
      return runtime->buffer_size - snd_pcm_capture_avail(runtime);
}

/**
 * snd_pcm_playback_ready - check whether the playback buffer is available
 * @substream: the pcm substream instance
 *
 * Checks whether enough free space is available on the playback buffer.
 *
 * Returns non-zero if available, or zero if not.
 */
static inline int snd_pcm_playback_ready(snd_pcm_substream_t *substream)
{
      snd_pcm_runtime_t *runtime = substream->runtime;
      return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
}

/**
 * snd_pcm_capture_ready - check whether the capture buffer is available
 * @substream: the pcm substream instance
 *
 * Checks whether enough capture data is available on the capture buffer.
 *
 * Returns non-zero if available, or zero if not.
 */
static inline int snd_pcm_capture_ready(snd_pcm_substream_t *substream)
{
      snd_pcm_runtime_t *runtime = substream->runtime;
      return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
}

/**
 * snd_pcm_playback_data - check whether any data exists on the playback buffer
 * @substream: the pcm substream instance
 *
 * Checks whether any data exists on the playback buffer. If stop_threshold
 * is bigger or equal to boundary, then this function returns always non-zero.
 *
 * Returns non-zero if exists, or zero if not.
 */
static inline int snd_pcm_playback_data(snd_pcm_substream_t *substream)
{
      snd_pcm_runtime_t *runtime = substream->runtime;
      
      if (runtime->stop_threshold >= runtime->boundary)
            return 1;
      return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
}

/**
 * snd_pcm_playback_empty - check whether the playback buffer is empty
 * @substream: the pcm substream instance
 *
 * Checks whether the playback buffer is empty.
 *
 * Returns non-zero if empty, or zero if not.
 */
static inline int snd_pcm_playback_empty(snd_pcm_substream_t *substream)
{
      snd_pcm_runtime_t *runtime = substream->runtime;
      return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
}

/**
 * snd_pcm_capture_empty - check whether the capture buffer is empty
 * @substream: the pcm substream instance
 *
 * Checks whether the capture buffer is empty.
 *
 * Returns non-zero if empty, or zero if not.
 */
static inline int snd_pcm_capture_empty(snd_pcm_substream_t *substream)
{
      snd_pcm_runtime_t *runtime = substream->runtime;
      return snd_pcm_capture_avail(runtime) == 0;
}

static inline void snd_pcm_trigger_done(snd_pcm_substream_t *substream, 
                              snd_pcm_substream_t *master)
{
      substream->runtime->trigger_master = master;
}

static inline int hw_is_mask(int var)
{
      return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
            var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
}

static inline int hw_is_interval(int var)
{
      return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
            var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
}

static inline snd_mask_t *hw_param_mask(snd_pcm_hw_params_t *params,
                             snd_pcm_hw_param_t var)
{
      return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
}

static inline snd_interval_t *hw_param_interval(snd_pcm_hw_params_t *params,
                                   snd_pcm_hw_param_t var)
{
      return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
}

static inline const snd_mask_t *hw_param_mask_c(const snd_pcm_hw_params_t *params,
                                   snd_pcm_hw_param_t var)
{
      return (const snd_mask_t *)hw_param_mask((snd_pcm_hw_params_t*) params, var);
}

static inline const snd_interval_t *hw_param_interval_c(const snd_pcm_hw_params_t *params,
                                         snd_pcm_hw_param_t var)
{
      return (const snd_interval_t *)hw_param_interval((snd_pcm_hw_params_t*) params, var);
}

#define params_access(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_ACCESS))
#define params_format(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_FORMAT))
#define params_subformat(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_SUBFORMAT))
#define params_channels(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_CHANNELS)->min
#define params_rate(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_RATE)->min
#define params_period_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min
#define params_period_bytes(p) ((params_period_size(p)*snd_pcm_format_physical_width(params_format(p))*params_channels(p))/8)
#define params_periods(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIODS)->min
#define params_buffer_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min
#define params_buffer_bytes(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min
#define params_tick_time(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_TICK_TIME)->min


int snd_interval_refine(snd_interval_t *i, const snd_interval_t *v);
void snd_interval_mul(const snd_interval_t *a, const snd_interval_t *b, snd_interval_t *c);
void snd_interval_div(const snd_interval_t *a, const snd_interval_t *b, snd_interval_t *c);
void snd_interval_muldivk(const snd_interval_t *a, const snd_interval_t *b, 
                    unsigned int k, snd_interval_t *c);
void snd_interval_mulkdiv(const snd_interval_t *a, unsigned int k,
                    const snd_interval_t *b, snd_interval_t *c);
int snd_interval_list(snd_interval_t *i, unsigned int count, unsigned int *list, unsigned int mask);
int snd_interval_ratnum(snd_interval_t *i,
                  unsigned int rats_count, ratnum_t *rats,
                  unsigned int *nump, unsigned int *denp);

void _snd_pcm_hw_params_any(snd_pcm_hw_params_t *params);
void _snd_pcm_hw_param_setempty(snd_pcm_hw_params_t *params, snd_pcm_hw_param_t var);
int snd_pcm_hw_param_min(snd_pcm_substream_t *substream, 
                   snd_pcm_hw_params_t *params,
                   snd_pcm_hw_param_t var,
                   unsigned int val, int *dir);
int snd_pcm_hw_param_max(snd_pcm_substream_t *substream, 
                   snd_pcm_hw_params_t *params,
                   snd_pcm_hw_param_t var,
                   unsigned int val, int *dir);
int snd_pcm_hw_param_setinteger(snd_pcm_substream_t *substream, 
                        snd_pcm_hw_params_t *params,
                        snd_pcm_hw_param_t var);
int snd_pcm_hw_param_first(snd_pcm_substream_t *substream, 
                     snd_pcm_hw_params_t *params,
                     snd_pcm_hw_param_t var, int *dir);
int snd_pcm_hw_param_last(snd_pcm_substream_t *substream, 
                    snd_pcm_hw_params_t *params,
                    snd_pcm_hw_param_t var, int *dir);
int snd_pcm_hw_param_near(snd_pcm_substream_t *substream, 
                    snd_pcm_hw_params_t *params,
                    snd_pcm_hw_param_t var, 
                    unsigned int val, int *dir);
int snd_pcm_hw_param_set(snd_pcm_substream_t *pcm,
                   snd_pcm_hw_params_t *params,
                   snd_pcm_hw_param_t var,
                   unsigned int val, int dir);
int snd_pcm_hw_params_choose(snd_pcm_substream_t *substream, snd_pcm_hw_params_t *params);

int snd_pcm_hw_refine(snd_pcm_substream_t *substream, snd_pcm_hw_params_t *params);
int snd_pcm_hw_params(snd_pcm_substream_t *substream, snd_pcm_hw_params_t *params);

int snd_pcm_hw_constraints_init(snd_pcm_substream_t *substream);
int snd_pcm_hw_constraints_complete(snd_pcm_substream_t *substream);

int snd_pcm_hw_constraint_mask(snd_pcm_runtime_t *runtime, snd_pcm_hw_param_t var,
                         u_int32_t mask);
int snd_pcm_hw_constraint_mask64(snd_pcm_runtime_t *runtime, snd_pcm_hw_param_t var,
                         u_int64_t mask);
int snd_pcm_hw_constraint_minmax(snd_pcm_runtime_t *runtime, snd_pcm_hw_param_t var,
                         unsigned int min, unsigned int max);
int snd_pcm_hw_constraint_integer(snd_pcm_runtime_t *runtime, snd_pcm_hw_param_t var);
int snd_pcm_hw_constraint_list(snd_pcm_runtime_t *runtime, 
                         unsigned int cond,
                         snd_pcm_hw_param_t var,
                         snd_pcm_hw_constraint_list_t *l);
int snd_pcm_hw_constraint_ratnums(snd_pcm_runtime_t *runtime, 
                          unsigned int cond,
                          snd_pcm_hw_param_t var,
                          snd_pcm_hw_constraint_ratnums_t *r);
int snd_pcm_hw_constraint_ratdens(snd_pcm_runtime_t *runtime, 
                          unsigned int cond,
                          snd_pcm_hw_param_t var,
                          snd_pcm_hw_constraint_ratdens_t *r);
int snd_pcm_hw_constraint_msbits(snd_pcm_runtime_t *runtime, 
                         unsigned int cond,
                         unsigned int width,
                         unsigned int msbits);
int snd_pcm_hw_constraint_step(snd_pcm_runtime_t *runtime,
                         unsigned int cond,
                         snd_pcm_hw_param_t var,
                         unsigned long step);
int snd_pcm_hw_constraint_pow2(snd_pcm_runtime_t *runtime,
                         unsigned int cond,
                         snd_pcm_hw_param_t var);
int snd_pcm_hw_rule_add(snd_pcm_runtime_t *runtime,
                  unsigned int cond,
                  int var,
                  snd_pcm_hw_rule_func_t func, void *private,
                  int dep, ...);

int snd_pcm_format_signed(snd_pcm_format_t format);
int snd_pcm_format_unsigned(snd_pcm_format_t format);
int snd_pcm_format_linear(snd_pcm_format_t format);
int snd_pcm_format_little_endian(snd_pcm_format_t format);
int snd_pcm_format_big_endian(snd_pcm_format_t format);
int snd_pcm_format_width(snd_pcm_format_t format);                /* in bits */
int snd_pcm_format_physical_width(snd_pcm_format_t format);       /* in bits */
const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsignd, int big_endian);
const char *snd_pcm_format_name(snd_pcm_format_t format);

void snd_pcm_set_ops(snd_pcm_t * pcm, int direction, snd_pcm_ops_t *ops);
void snd_pcm_set_sync(snd_pcm_substream_t * substream);
int snd_pcm_lib_interleave_len(snd_pcm_substream_t *substream);
int snd_pcm_lib_ioctl(snd_pcm_substream_t *substream,
                  unsigned int cmd, void *arg);                      
int snd_pcm_update_hw_ptr(snd_pcm_substream_t *substream);
int snd_pcm_playback_xrun_check(snd_pcm_substream_t *substream);
int snd_pcm_capture_xrun_check(snd_pcm_substream_t *substream);
int snd_pcm_playback_xrun_asap(snd_pcm_substream_t *substream);
int snd_pcm_capture_xrun_asap(snd_pcm_substream_t *substream);
void snd_pcm_playback_silence(snd_pcm_substream_t *substream, snd_pcm_uframes_t new_hw_ptr);
void snd_pcm_tick_prepare(snd_pcm_substream_t *substream);
void snd_pcm_tick_set(snd_pcm_substream_t *substream, unsigned long ticks);
void snd_pcm_tick_elapsed(snd_pcm_substream_t *substream);
void snd_pcm_period_elapsed(snd_pcm_substream_t *substream);
snd_pcm_sframes_t snd_pcm_lib_write(snd_pcm_substream_t *substream,
                            const void __user *buf,
                            snd_pcm_uframes_t frames);
snd_pcm_sframes_t snd_pcm_lib_read(snd_pcm_substream_t *substream,
                           void __user *buf, snd_pcm_uframes_t frames);
snd_pcm_sframes_t snd_pcm_lib_writev(snd_pcm_substream_t *substream,
                             void __user **bufs, snd_pcm_uframes_t frames);
snd_pcm_sframes_t snd_pcm_lib_readv(snd_pcm_substream_t *substream,
                            void __user **bufs, snd_pcm_uframes_t frames);

int snd_pcm_limit_hw_rates(snd_pcm_runtime_t *runtime);

static inline void snd_pcm_set_runtime_buffer(snd_pcm_substream_t *substream,
                                    struct snd_dma_buffer *bufp)
{
      snd_pcm_runtime_t *runtime = substream->runtime;
      if (bufp) {
            runtime->dma_buffer_p = bufp;
            runtime->dma_area = bufp->area;
            runtime->dma_addr = bufp->addr;
            runtime->dma_bytes = bufp->bytes;
      } else {
            runtime->dma_buffer_p = NULL;
            runtime->dma_area = NULL;
            runtime->dma_addr = 0;
            runtime->dma_bytes = 0;
      }
}

/*
 *  Timer interface
 */

void snd_pcm_timer_resolution_change(snd_pcm_substream_t *substream);
void snd_pcm_timer_init(snd_pcm_substream_t * substream);
void snd_pcm_timer_done(snd_pcm_substream_t * substream);

/*
 *  Memory
 */

int snd_pcm_lib_preallocate_free(snd_pcm_substream_t *substream);
int snd_pcm_lib_preallocate_free_for_all(snd_pcm_t *pcm);
int snd_pcm_lib_preallocate_pages(snd_pcm_substream_t *substream,
                          int type, struct device *data,
                          size_t size, size_t max);
int snd_pcm_lib_preallocate_pages_for_all(snd_pcm_t *pcm,
                                int type, void *data,
                                size_t size, size_t max);
int snd_pcm_lib_malloc_pages(snd_pcm_substream_t *substream, size_t size);
int snd_pcm_lib_free_pages(snd_pcm_substream_t *substream);

#define snd_pcm_substream_sgbuf(substream) ((substream)->runtime->dma_buffer_p->private_data)
#define snd_pcm_sgbuf_pages(size) snd_sgbuf_aligned_pages(size)
#define snd_pcm_sgbuf_get_addr(sgbuf,ofs) snd_sgbuf_get_addr(sgbuf,ofs)
struct page *snd_pcm_sgbuf_ops_page(snd_pcm_substream_t *substream, unsigned long offset);

/* handle mmap counter - PCM mmap callback should handle this counter properly */
static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
{
      snd_pcm_substream_t *substream = (snd_pcm_substream_t *)area->vm_private_data;
      atomic_inc(&substream->runtime->mmap_count);
}

static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
{
      snd_pcm_substream_t *substream = (snd_pcm_substream_t *)area->vm_private_data;
      atomic_dec(&substream->runtime->mmap_count);
}

/* mmap for io-memory area */
#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
#define SNDRV_PCM_INFO_MMAP_IOMEM   SNDRV_PCM_INFO_MMAP
int snd_pcm_lib_mmap_iomem(snd_pcm_substream_t *substream, struct vm_area_struct *area);
#else
#define SNDRV_PCM_INFO_MMAP_IOMEM   0
#define snd_pcm_lib_mmap_iomem      NULL
#endif

static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
{
      *max = dma < 4 ? 64 * 1024 : 128 * 1024;
}

/*
 *  Misc
 */

#define SNDRV_PCM_DEFAULT_CON_SPDIF (IEC958_AES0_CON_EMPHASIS_NONE|\
                               (IEC958_AES1_CON_ORIGINAL<<8)|\
                               (IEC958_AES1_CON_PCM_CODER<<8)|\
                               (IEC958_AES3_CON_FS_48000<<24))

#endif /* __SOUND_PCM_H */

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