/* SPDX-License-Identifier: GPL-2.0-or-later */

  #ifndef __SOUND_PCM_H
  #define __SOUND_PCM_H
  
  /*
   *  Digital Audio (PCM) abstract layer

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

   *                   Abramo Bagnara <abramo@alsa-project.org>

   */
  
  #include <sound/asound.h>
  #include <sound/memalloc.h>

  #include <sound/minors.h>

  #include <linux/poll.h>

  #include <linux/mm.h>

  #include <linux/bitops.h>

  #include <linux/pm_qos.h>

  #include <linux/refcount.h>

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

  #if IS_ENABLED(CONFIG_SND_PCM_OSS)

  #include <sound/pcm_oss.h>

  #endif
  
  /*
   *  Hardware (lowlevel) section
   */

  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 */

  };

  struct snd_pcm_substream;

  struct snd_pcm_audio_tstamp_config; /* definitions further down */
  struct snd_pcm_audio_tstamp_report;

  struct snd_pcm_ops {
  	int (*open)(struct snd_pcm_substream *substream);
  	int (*close)(struct snd_pcm_substream *substream);
  	int (*ioctl)(struct snd_pcm_substream * substream,

  		     unsigned int cmd, void *arg);

  	int (*hw_params)(struct snd_pcm_substream *substream,
  			 struct snd_pcm_hw_params *params);
  	int (*hw_free)(struct snd_pcm_substream *substream);
  	int (*prepare)(struct snd_pcm_substream *substream);
  	int (*trigger)(struct snd_pcm_substream *substream, int cmd);
  	snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *substream);

  	int (*get_time_info)(struct snd_pcm_substream *substream,
  			struct timespec *system_ts, struct timespec *audio_ts,
  			struct snd_pcm_audio_tstamp_config *audio_tstamp_config,
  			struct snd_pcm_audio_tstamp_report *audio_tstamp_report);

  	int (*fill_silence)(struct snd_pcm_substream *substream, int channel,
  			    unsigned long pos, unsigned long bytes);
  	int (*copy_user)(struct snd_pcm_substream *substream, int channel,
  			 unsigned long pos, void __user *buf,
  			 unsigned long bytes);
  	int (*copy_kernel)(struct snd_pcm_substream *substream, int channel,
  			   unsigned long pos, void *buf, unsigned long bytes);

  	struct page *(*page)(struct snd_pcm_substream *substream,
  			     unsigned long offset);
  	int (*mmap)(struct snd_pcm_substream *substream, struct vm_area_struct *vma);
  	int (*ack)(struct snd_pcm_substream *substream);
  };

  
  /*
   *
   */

  #if defined(CONFIG_SND_DYNAMIC_MINORS)
  #define SNDRV_PCM_DEVICES	(SNDRV_OS_MINORS-2)
  #else
  #define SNDRV_PCM_DEVICES	8
  #endif

  #define SNDRV_PCM_IOCTL1_RESET		0

  /* 1 is absent slot. */

  #define SNDRV_PCM_IOCTL1_CHANNEL_INFO	2

  /* 3 is absent slot. */

  #define SNDRV_PCM_IOCTL1_FIFO_SIZE	4

  
  #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_TRIGGER_DRAIN		7

  
  #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_352800		(1<<13)		/* 352800Hz */
  #define SNDRV_PCM_RATE_384000		(1<<14)		/* 384000Hz */

  
  #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_RATE_8000_384000	(SNDRV_PCM_RATE_8000_192000|\
  					 SNDRV_PCM_RATE_352800|\
  					 SNDRV_PCM_RATE_384000)

  #define _SNDRV_PCM_FMTBIT(fmt)		(1ULL << (__force int)SNDRV_PCM_FORMAT_##fmt)
  #define SNDRV_PCM_FMTBIT_S8		_SNDRV_PCM_FMTBIT(S8)
  #define SNDRV_PCM_FMTBIT_U8		_SNDRV_PCM_FMTBIT(U8)
  #define SNDRV_PCM_FMTBIT_S16_LE		_SNDRV_PCM_FMTBIT(S16_LE)
  #define SNDRV_PCM_FMTBIT_S16_BE		_SNDRV_PCM_FMTBIT(S16_BE)
  #define SNDRV_PCM_FMTBIT_U16_LE		_SNDRV_PCM_FMTBIT(U16_LE)
  #define SNDRV_PCM_FMTBIT_U16_BE		_SNDRV_PCM_FMTBIT(U16_BE)
  #define SNDRV_PCM_FMTBIT_S24_LE		_SNDRV_PCM_FMTBIT(S24_LE)
  #define SNDRV_PCM_FMTBIT_S24_BE		_SNDRV_PCM_FMTBIT(S24_BE)
  #define SNDRV_PCM_FMTBIT_U24_LE		_SNDRV_PCM_FMTBIT(U24_LE)
  #define SNDRV_PCM_FMTBIT_U24_BE		_SNDRV_PCM_FMTBIT(U24_BE)
  #define SNDRV_PCM_FMTBIT_S32_LE		_SNDRV_PCM_FMTBIT(S32_LE)
  #define SNDRV_PCM_FMTBIT_S32_BE		_SNDRV_PCM_FMTBIT(S32_BE)
  #define SNDRV_PCM_FMTBIT_U32_LE		_SNDRV_PCM_FMTBIT(U32_LE)
  #define SNDRV_PCM_FMTBIT_U32_BE		_SNDRV_PCM_FMTBIT(U32_BE)
  #define SNDRV_PCM_FMTBIT_FLOAT_LE	_SNDRV_PCM_FMTBIT(FLOAT_LE)
  #define SNDRV_PCM_FMTBIT_FLOAT_BE	_SNDRV_PCM_FMTBIT(FLOAT_BE)
  #define SNDRV_PCM_FMTBIT_FLOAT64_LE	_SNDRV_PCM_FMTBIT(FLOAT64_LE)
  #define SNDRV_PCM_FMTBIT_FLOAT64_BE	_SNDRV_PCM_FMTBIT(FLOAT64_BE)
  #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_LE)
  #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_BE)
  #define SNDRV_PCM_FMTBIT_MU_LAW		_SNDRV_PCM_FMTBIT(MU_LAW)
  #define SNDRV_PCM_FMTBIT_A_LAW		_SNDRV_PCM_FMTBIT(A_LAW)
  #define SNDRV_PCM_FMTBIT_IMA_ADPCM	_SNDRV_PCM_FMTBIT(IMA_ADPCM)
  #define SNDRV_PCM_FMTBIT_MPEG		_SNDRV_PCM_FMTBIT(MPEG)
  #define SNDRV_PCM_FMTBIT_GSM		_SNDRV_PCM_FMTBIT(GSM)

  #define SNDRV_PCM_FMTBIT_S20_LE	_SNDRV_PCM_FMTBIT(S20_LE)
  #define SNDRV_PCM_FMTBIT_U20_LE	_SNDRV_PCM_FMTBIT(U20_LE)
  #define SNDRV_PCM_FMTBIT_S20_BE	_SNDRV_PCM_FMTBIT(S20_BE)
  #define SNDRV_PCM_FMTBIT_U20_BE	_SNDRV_PCM_FMTBIT(U20_BE)

  #define SNDRV_PCM_FMTBIT_SPECIAL	_SNDRV_PCM_FMTBIT(SPECIAL)
  #define SNDRV_PCM_FMTBIT_S24_3LE	_SNDRV_PCM_FMTBIT(S24_3LE)
  #define SNDRV_PCM_FMTBIT_U24_3LE	_SNDRV_PCM_FMTBIT(U24_3LE)
  #define SNDRV_PCM_FMTBIT_S24_3BE	_SNDRV_PCM_FMTBIT(S24_3BE)
  #define SNDRV_PCM_FMTBIT_U24_3BE	_SNDRV_PCM_FMTBIT(U24_3BE)
  #define SNDRV_PCM_FMTBIT_S20_3LE	_SNDRV_PCM_FMTBIT(S20_3LE)
  #define SNDRV_PCM_FMTBIT_U20_3LE	_SNDRV_PCM_FMTBIT(U20_3LE)
  #define SNDRV_PCM_FMTBIT_S20_3BE	_SNDRV_PCM_FMTBIT(S20_3BE)
  #define SNDRV_PCM_FMTBIT_U20_3BE	_SNDRV_PCM_FMTBIT(U20_3BE)
  #define SNDRV_PCM_FMTBIT_S18_3LE	_SNDRV_PCM_FMTBIT(S18_3LE)
  #define SNDRV_PCM_FMTBIT_U18_3LE	_SNDRV_PCM_FMTBIT(U18_3LE)
  #define SNDRV_PCM_FMTBIT_S18_3BE	_SNDRV_PCM_FMTBIT(S18_3BE)
  #define SNDRV_PCM_FMTBIT_U18_3BE	_SNDRV_PCM_FMTBIT(U18_3BE)
  #define SNDRV_PCM_FMTBIT_G723_24	_SNDRV_PCM_FMTBIT(G723_24)
  #define SNDRV_PCM_FMTBIT_G723_24_1B	_SNDRV_PCM_FMTBIT(G723_24_1B)
  #define SNDRV_PCM_FMTBIT_G723_40	_SNDRV_PCM_FMTBIT(G723_40)
  #define SNDRV_PCM_FMTBIT_G723_40_1B	_SNDRV_PCM_FMTBIT(G723_40_1B)

  #define SNDRV_PCM_FMTBIT_DSD_U8		_SNDRV_PCM_FMTBIT(DSD_U8)
  #define SNDRV_PCM_FMTBIT_DSD_U16_LE	_SNDRV_PCM_FMTBIT(DSD_U16_LE)

  #define SNDRV_PCM_FMTBIT_DSD_U32_LE	_SNDRV_PCM_FMTBIT(DSD_U32_LE)

  #define SNDRV_PCM_FMTBIT_DSD_U16_BE	_SNDRV_PCM_FMTBIT(DSD_U16_BE)
  #define SNDRV_PCM_FMTBIT_DSD_U32_BE	_SNDRV_PCM_FMTBIT(DSD_U32_BE)

  
  #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

  #define SNDRV_PCM_FMTBIT_S20		SNDRV_PCM_FMTBIT_S20_LE
  #define SNDRV_PCM_FMTBIT_U20		SNDRV_PCM_FMTBIT_U20_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

  #define SNDRV_PCM_FMTBIT_S20		SNDRV_PCM_FMTBIT_S20_BE
  #define SNDRV_PCM_FMTBIT_U20		SNDRV_PCM_FMTBIT_U20_BE

  #endif

  struct snd_pcm_file {
  	struct snd_pcm_substream *substream;

  	int no_compat_mmap;

  	unsigned int user_pversion;	/* supported protocol version */

  };

  struct snd_pcm_hw_rule;
  typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params,
  				      struct snd_pcm_hw_rule *rule);

  struct snd_pcm_hw_rule {

  	unsigned int cond;

  	int var;
  	int deps[4];

  
  	snd_pcm_hw_rule_func_t func;

  	void *private;
  };

  struct snd_pcm_hw_constraints {
  	struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK - 

  			 SNDRV_PCM_HW_PARAM_FIRST_MASK + 1];

  	struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL -

  			     SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
  	unsigned int rules_num;
  	unsigned int rules_all;

  	struct snd_pcm_hw_rule *rules;
  };

  static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs,
  					    snd_pcm_hw_param_t var)

  {
  	return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
  }

  static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs,
  						    snd_pcm_hw_param_t var)

  {
  	return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
  }

  struct snd_ratnum {

  	unsigned int num;
  	unsigned int den_min, den_max, den_step;

  };

  struct snd_ratden {

  	unsigned int num_min, num_max, num_step;
  	unsigned int den;

  };

  struct snd_pcm_hw_constraint_ratnums {

  	int nrats;

  	const struct snd_ratnum *rats;

  };

  struct snd_pcm_hw_constraint_ratdens {

  	int nrats;

  	const struct snd_ratden *rats;

  };

  struct snd_pcm_hw_constraint_list {

  	const unsigned int *list;

  	unsigned int count;

  	unsigned int mask;

  };

  struct snd_pcm_hw_constraint_ranges {
  	unsigned int count;
  	const struct snd_interval *ranges;
  	unsigned int mask;
  };

  /*
   * userspace-provided audio timestamp config to kernel,
   * structure is for internal use only and filled with dedicated unpack routine
   */
  struct snd_pcm_audio_tstamp_config {
  	/* 5 of max 16 bits used */
  	u32 type_requested:4;
  	u32 report_delay:1; /* add total delay to A/D or D/A */
  };
  
  static inline void snd_pcm_unpack_audio_tstamp_config(__u32 data,
  						struct snd_pcm_audio_tstamp_config *config)
  {
  	config->type_requested = data & 0xF;
  	config->report_delay = (data >> 4) & 1;
  }
  
  /*
   * kernel-provided audio timestamp report to user-space
   * structure is for internal use only and read by dedicated pack routine
   */
  struct snd_pcm_audio_tstamp_report {
  	/* 6 of max 16 bits used for bit-fields */
  
  	/* for backwards compatibility */
  	u32 valid:1;
  
  	/* actual type if hardware could not support requested timestamp */
  	u32 actual_type:4;
  
  	/* accuracy represented in ns units */
  	u32 accuracy_report:1; /* 0 if accuracy unknown, 1 if accuracy field is valid */
  	u32 accuracy; /* up to 4.29s, will be packed in separate field  */
  };
  
  static inline void snd_pcm_pack_audio_tstamp_report(__u32 *data, __u32 *accuracy,
  						const struct snd_pcm_audio_tstamp_report *report)
  {
  	u32 tmp;
  
  	tmp = report->accuracy_report;
  	tmp <<= 4;
  	tmp |= report->actual_type;
  	tmp <<= 1;
  	tmp |= report->valid;
  
  	*data &= 0xffff; /* zero-clear MSBs */
  	*data |= (tmp << 16);
  	*accuracy = report->accuracy;
  }

  struct snd_pcm_runtime {

  	/* -- Status -- */

  	struct snd_pcm_substream *trigger_master;

  	struct timespec trigger_tstamp;	/* trigger timestamp */

  	bool trigger_tstamp_latched;     /* trigger timestamp latched in low-level driver/hardware */

  	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 */

  	unsigned long hw_ptr_jiffies;	/* Time when hw_ptr is updated */

  	unsigned long hw_ptr_buffer_jiffies; /* buffer time in jiffies */

  	snd_pcm_sframes_t delay;	/* extra delay; typically FIFO size */

  	u64 hw_ptr_wrap;                /* offset for hw_ptr due to boundary wrap-around */

  
  	/* -- 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 */

  	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;

  	unsigned int no_period_wakeup: 1;

  
  	/* -- SW params -- */

  	int tstamp_mode;		/* mmap timestamp is updated */

    	unsigned int period_step;

  	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 */

  	union snd_pcm_sync_id sync;	/* hardware synchronization ID */

  
  	/* -- mmap -- */

  	struct snd_pcm_mmap_status *status;
  	struct snd_pcm_mmap_control *control;

  
  	/* -- locking / scheduling -- */

  	snd_pcm_uframes_t twake; 	/* do transfer (!poll) wakeup if non-zero */

  	wait_queue_head_t sleep;	/* poll sleep */
  	wait_queue_head_t tsleep;	/* transfer sleep */

  	struct fasync_struct *fasync;
  
  	/* -- private section -- */
  	void *private_data;

  	void (*private_free)(struct snd_pcm_runtime *runtime);

  
  	/* -- hardware description -- */

  	struct snd_pcm_hardware hw;
  	struct snd_pcm_hw_constraints hw_constraints;

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

  	int tstamp_type;		/* timestamp type */

  
  	/* -- 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 */

  	/* -- audio timestamp config -- */
  	struct snd_pcm_audio_tstamp_config audio_tstamp_config;
  	struct snd_pcm_audio_tstamp_report audio_tstamp_report;
  	struct timespec driver_tstamp;

  #if IS_ENABLED(CONFIG_SND_PCM_OSS)

  	/* -- OSS things -- */

  	struct snd_pcm_oss_runtime oss;

  #endif
  };

  struct snd_pcm_group {		/* keep linked substreams */

  	spinlock_t lock;

  	struct mutex mutex;

  	struct list_head substreams;

  	refcount_t refs;

  };

  struct pid;

  struct snd_pcm_substream {
  	struct snd_pcm *pcm;
  	struct snd_pcm_str *pstr;

  	void *private_data;		/* copied from pcm->private_data */
  	int number;
  	char name[32];			/* substream name */
  	int stream;			/* stream (direction) */

  	struct pm_qos_request latency_pm_qos_req; /* pm_qos request */

  	size_t buffer_bytes_max;	/* limit ring buffer size */
  	struct snd_dma_buffer dma_buffer;

  	size_t dma_max;
  	/* -- hardware operations -- */

  	const struct snd_pcm_ops *ops;

  	/* -- runtime information -- */

  	struct snd_pcm_runtime *runtime;

          /* -- timer section -- */

  	struct snd_timer *timer;		/* timer */

  	unsigned timer_running: 1;	/* time is running */

  	long wait_time;	/* time in ms for R/W to wait for avail */

  	/* -- next substream -- */

  	struct snd_pcm_substream *next;

  	/* -- linked substreams -- */
  	struct list_head link_list;	/* linked list member */

  	struct snd_pcm_group self_group;	/* fake group for non linked substream (with substream lock inside) */
  	struct snd_pcm_group *group;		/* pointer to current group */

  	/* -- assigned files -- */

  	int ref_count;

  	atomic_t mmap_count;

  	unsigned int f_flags;

  	void (*pcm_release)(struct snd_pcm_substream *);

  	struct pid *pid;

  #if IS_ENABLED(CONFIG_SND_PCM_OSS)

  	/* -- OSS things -- */

  	struct snd_pcm_oss_substream oss;

  #endif

  #ifdef CONFIG_SND_VERBOSE_PROCFS

  	struct snd_info_entry *proc_root;

  #endif /* CONFIG_SND_VERBOSE_PROCFS */

  	/* misc flags */

  	unsigned int hw_opened: 1;

  };

  #define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0)

  struct snd_pcm_str {

  	int stream;				/* stream (direction) */

  	struct snd_pcm *pcm;

  	/* -- substreams -- */
  	unsigned int substream_count;
  	unsigned int substream_opened;

  	struct snd_pcm_substream *substream;

  #if IS_ENABLED(CONFIG_SND_PCM_OSS)

  	/* -- OSS things -- */

  	struct snd_pcm_oss_stream oss;

  #endif

  #ifdef CONFIG_SND_VERBOSE_PROCFS

  	struct snd_info_entry *proc_root;

  #ifdef CONFIG_SND_PCM_XRUN_DEBUG

  	unsigned int xrun_debug;	/* 0 = disabled, 1 = verbose, 2 = stacktrace */

  #endif

  #endif

  	struct snd_kcontrol *chmap_kctl; /* channel-mapping controls */

  	struct device dev;

  };

  struct snd_pcm {
  	struct snd_card *card;

  	struct list_head list;

  	int device; /* device number */

  	unsigned int info_flags;
  	unsigned short dev_class;
  	unsigned short dev_subclass;
  	char id[64];
  	char name[80];

  	struct snd_pcm_str streams[2];

  	struct mutex open_mutex;

  	wait_queue_head_t open_wait;
  	void *private_data;

  	void (*private_free) (struct snd_pcm *pcm);

  	bool internal; /* pcm is for internal use only */

  	bool nonatomic; /* whole PCM operations are in non-atomic context */

  	bool no_device_suspend; /* don't invoke device PM suspend */

  #if IS_ENABLED(CONFIG_SND_PCM_OSS)

  	struct snd_pcm_oss oss;

  #endif
  };

  /*
   *  Registering
   */

  extern const struct file_operations snd_pcm_f_ops[2];

  int snd_pcm_new(struct snd_card *card, const char *id, int device,

  		int playback_count, int capture_count,

  		struct snd_pcm **rpcm);

  int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
  		int playback_count, int capture_count,
  		struct snd_pcm **rpcm);

  int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);

  #if IS_ENABLED(CONFIG_SND_PCM_OSS)
  struct snd_pcm_notify {
  	int (*n_register) (struct snd_pcm * pcm);
  	int (*n_disconnect) (struct snd_pcm * pcm);
  	int (*n_unregister) (struct snd_pcm * pcm);
  	struct list_head list;
  };

  int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);

  #endif

  
  /*
   *  Native I/O
   */

  int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
  int snd_pcm_info_user(struct snd_pcm_substream *substream,
  		      struct snd_pcm_info __user *info);
  int snd_pcm_status(struct snd_pcm_substream *substream,
  		   struct snd_pcm_status *status);

  int snd_pcm_start(struct snd_pcm_substream *substream);

  int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t status);

  int snd_pcm_drain_done(struct snd_pcm_substream *substream);

  int snd_pcm_stop_xrun(struct snd_pcm_substream *substream);

  #ifdef CONFIG_PM

  int snd_pcm_suspend_all(struct snd_pcm *pcm);

  #else

  static inline int snd_pcm_suspend_all(struct snd_pcm *pcm)
  {
  	return 0;
  }

  #endif

  int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);

  int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
  			   struct snd_pcm_substream **rsubstream);

  void snd_pcm_release_substream(struct snd_pcm_substream *substream);

  int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
  			     struct snd_pcm_substream **rsubstream);
  void snd_pcm_detach_substream(struct snd_pcm_substream *substream);

  int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);

  
  #ifdef CONFIG_SND_DEBUG
  void snd_pcm_debug_name(struct snd_pcm_substream *substream,
  			   char *name, size_t len);
  #else
  static inline void
  snd_pcm_debug_name(struct snd_pcm_substream *substream, char *buf, size_t size)
  {
  	*buf = 0;
  }
  #endif

  /*
   *  PCM library
   */

  /**
   * snd_pcm_stream_linked - Check whether the substream is linked with others
   * @substream: substream to check
   *
   * Returns true if the given substream is being linked with others.
   */

  static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)

  {
  	return substream->group != &substream->self_group;
  }

  void snd_pcm_stream_lock(struct snd_pcm_substream *substream);
  void snd_pcm_stream_unlock(struct snd_pcm_substream *substream);
  void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream);
  void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream);
  unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream);

  
  /**
   * snd_pcm_stream_lock_irqsave - Lock the PCM stream
   * @substream: PCM substream
   * @flags: irq flags
   *
   * This locks the PCM stream like snd_pcm_stream_lock() but with the local
   * IRQ (only when nonatomic is false).  In nonatomic case, this is identical
   * as snd_pcm_stream_lock().
   */

  #define snd_pcm_stream_lock_irqsave(substream, flags)		 \
  	do {							 \
  		typecheck(unsigned long, flags);		 \
  		flags = _snd_pcm_stream_lock_irqsave(substream); \
  	} while (0)
  void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
  				      unsigned long flags);

  /**
   * snd_pcm_group_for_each_entry - iterate over the linked substreams
   * @s: the iterator
   * @substream: the substream
   *
   * Iterate over the all linked substreams to the given @substream.
   * When @substream isn't linked with any others, this gives returns @substream
   * itself once.
   */

  #define snd_pcm_group_for_each_entry(s, substream) \
  	list_for_each_entry(s, &substream->group->substreams, link_list)

  /**
   * snd_pcm_running - Check whether the substream is in a running state
   * @substream: substream to check
   *
   * Returns true if the given substream is in the state RUNNING, or in the
   * state DRAINING for playback.
   */

  static inline int snd_pcm_running(struct snd_pcm_substream *substream)

  {
  	return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
  		(substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
  		 substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
  }

  /**
   * bytes_to_samples - Unit conversion of the size from bytes to samples
   * @runtime: PCM runtime instance
   * @size: size in bytes
   */

  static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)

  {
  	return size * 8 / runtime->sample_bits;
  }

  /**
   * bytes_to_frames - Unit conversion of the size from bytes to frames
   * @runtime: PCM runtime instance
   * @size: size in bytes
   */

  static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)

  {
  	return size * 8 / runtime->frame_bits;
  }

  /**
   * samples_to_bytes - Unit conversion of the size from samples to bytes
   * @runtime: PCM runtime instance
   * @size: size in samples
   */

  static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)

  {
  	return size * runtime->sample_bits / 8;
  }

  /**
   * frames_to_bytes - Unit conversion of the size from frames to bytes
   * @runtime: PCM runtime instance
   * @size: size in frames
   */

  static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)

  {
  	return size * runtime->frame_bits / 8;
  }

  /**
   * frame_aligned - Check whether the byte size is aligned to frames
   * @runtime: PCM runtime instance
   * @bytes: size in bytes
   */

  static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)

  {
  	return bytes % runtime->byte_align == 0;
  }

  /**
   * snd_pcm_lib_buffer_bytes - Get the buffer size of the current PCM in bytes
   * @substream: PCM substream
   */

  static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)

  {

  	struct snd_pcm_runtime *runtime = substream->runtime;

  	return frames_to_bytes(runtime, runtime->buffer_size);
  }

  /**
   * snd_pcm_lib_period_bytes - Get the period size of the current PCM in bytes
   * @substream: PCM substream
   */

  static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)

  {

  	struct snd_pcm_runtime *runtime = substream->runtime;

  	return frames_to_bytes(runtime, runtime->period_size);
  }

  /**
   * snd_pcm_playback_avail - Get the available (writable) space for playback
   * @runtime: PCM runtime instance
   *
   * Result is between 0 ... (boundary - 1)

   */

  static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *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;
  }

  /**

   * snd_pcm_capture_avail - Get the available (readable) space for capture

   * @runtime: PCM runtime instance
   *
   * Result is between 0 ... (boundary - 1)

   */

  static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)

  {
  	snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
  	if (avail < 0)
  		avail += runtime->boundary;
  	return avail;
  }

  /**
   * snd_pcm_playback_hw_avail - Get the queued space for playback
   * @runtime: PCM runtime instance
   */

  static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)

  {
  	return runtime->buffer_size - snd_pcm_playback_avail(runtime);
  }

  /**
   * snd_pcm_capture_hw_avail - Get the free space for capture
   * @runtime: PCM runtime instance
   */

  static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *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.
   *

   * Return: Non-zero if available, or zero if not.

   */

  static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)

  {

  	struct snd_pcm_runtime *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.
   *

   * Return: Non-zero if available, or zero if not.

   */

  static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)

  {

  	struct snd_pcm_runtime *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.

   *

   * Return: Non-zero if any data exists, or zero if not. If stop_threshold
   * is bigger or equal to boundary, then this function returns always non-zero.

   */

  static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)

  {

  	struct snd_pcm_runtime *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.
   *

   * Return: Non-zero if empty, or zero if not.

   */

  static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)

  {

  	struct snd_pcm_runtime *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.
   *

   * Return: Non-zero if empty, or zero if not.

   */

  static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)

  {

  	struct snd_pcm_runtime *runtime = substream->runtime;

  	return snd_pcm_capture_avail(runtime) == 0;
  }

  /**
   * snd_pcm_trigger_done - Mark the master substream
   * @substream: the pcm substream instance
   * @master: the linked master substream
   *
   * When multiple substreams of the same card are linked and the hardware
   * supports the single-shot operation, the driver calls this in the loop
   * in snd_pcm_group_for_each_entry() for marking the substream as "done".
   * Then most of trigger operations are performed only to the given master
   * substream.
   *
   * The trigger_master mark is cleared at timestamp updates at the end
   * of trigger operations.
   */

  static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream, 
  					struct snd_pcm_substream *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 struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,

  				     snd_pcm_hw_param_t var)
  {
  	return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
  }

  static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,

  					     snd_pcm_hw_param_t var)
  {
  	return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
  }

  static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,

  					     snd_pcm_hw_param_t var)
  {

  	return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];

  }

  static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,

  						     snd_pcm_hw_param_t var)
  {

  	return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];

  }

  /**
   * params_channels - Get the number of channels from the hw params
   * @p: hw params
   */
  static inline unsigned int params_channels(const struct snd_pcm_hw_params *p)
  {
  	return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_CHANNELS)->min;
  }
  
  /**

   * params_rate - Get the sample rate from the hw params

   * @p: hw params
   */
  static inline unsigned int params_rate(const struct snd_pcm_hw_params *p)
  {
  	return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_RATE)->min;
  }
  
  /**

   * params_period_size - Get the period size (in frames) from the hw params

   * @p: hw params
   */
  static inline unsigned int params_period_size(const struct snd_pcm_hw_params *p)
  {
  	return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min;
  }
  
  /**

   * params_periods - Get the number of periods from the hw params

   * @p: hw params
   */
  static inline unsigned int params_periods(const struct snd_pcm_hw_params *p)
  {
  	return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIODS)->min;
  }
  
  /**

   * params_buffer_size - Get the buffer size (in frames) from the hw params

   * @p: hw params
   */
  static inline unsigned int params_buffer_size(const struct snd_pcm_hw_params *p)
  {
  	return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min;
  }
  
  /**

   * params_buffer_bytes - Get the buffer size (in bytes) from the hw params

   * @p: hw params
   */
  static inline unsigned int params_buffer_bytes(const struct snd_pcm_hw_params *p)
  {
  	return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min;
  }

  int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);

  int snd_interval_list(struct snd_interval *i, unsigned int count,
  		      const unsigned int *list, unsigned int mask);

  int snd_interval_ranges(struct snd_interval *i, unsigned int count,
  			const struct snd_interval *list, unsigned int mask);

  int snd_interval_ratnum(struct snd_interval *i,

  			unsigned int rats_count, const struct snd_ratnum *rats,

  			unsigned int *nump, unsigned int *denp);

  void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
  void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);

  int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);

  int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,

  				 u_int64_t mask);

  int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,

  				 unsigned int min, unsigned int max);

  int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
  int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime, 

  			       unsigned int cond,
  			       snd_pcm_hw_param_t var,

  			       const struct snd_pcm_hw_constraint_list *l);

  int snd_pcm_hw_constraint_ranges(struct snd_pcm_runtime *runtime,
  				 unsigned int cond,
  				 snd_pcm_hw_param_t var,
  				 const struct snd_pcm_hw_constraint_ranges *r);

  int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime, 

  				  unsigned int cond,
  				  snd_pcm_hw_param_t var,

  				  const struct snd_pcm_hw_constraint_ratnums *r);

  int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime, 

  				  unsigned int cond,
  				  snd_pcm_hw_param_t var,

  				  const struct snd_pcm_hw_constraint_ratdens *r);

  int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime, 

  				 unsigned int cond,
  				 unsigned int width,
  				 unsigned int msbits);

  int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,

  			       unsigned int cond,
  			       snd_pcm_hw_param_t var,
  			       unsigned long step);

  int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,

  			       unsigned int cond,
  			       snd_pcm_hw_param_t var);

  int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
  			       unsigned int base_rate);

  int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,

  			unsigned int cond,
  			int var,
  			snd_pcm_hw_rule_func_t func, void *private,
  			int dep, ...);

  /**
   * snd_pcm_hw_constraint_single() - Constrain parameter to a single value
   * @runtime: PCM runtime instance
   * @var: The hw_params variable to constrain
   * @val: The value to constrain to
   *
   * Return: Positive if the value is changed, zero if it's not changed, or a
   * negative error code.
   */
  static inline int snd_pcm_hw_constraint_single(
  	struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
  	unsigned int val)
  {
  	return snd_pcm_hw_constraint_minmax(runtime, var, val, val);
  }

  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);

  #if 0 /* just for kernel-doc */

  /**

   * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
   * @format: the format to check
   *

   * Return: 1 if the given PCM format is CPU-endian, 0 if

   * opposite, or a negative error code if endian not specified.
   */

  int snd_pcm_format_cpu_endian(snd_pcm_format_t format);

  #endif /* DocBook */

  #ifdef SNDRV_LITTLE_ENDIAN

  #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)

  #else

  #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)

  #endif

  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 */

  ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);

  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);

  void snd_pcm_set_ops(struct snd_pcm * pcm, int direction,
  		     const struct snd_pcm_ops *ops);

  void snd_pcm_set_sync(struct snd_pcm_substream *substream);

  int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,

  		      unsigned int cmd, void *arg);                      

  void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);

  snd_pcm_sframes_t __snd_pcm_lib_xfer(struct snd_pcm_substream *substream,

  				     void *buf, bool interleaved,

  				     snd_pcm_uframes_t frames, bool in_kernel);

  
  static inline snd_pcm_sframes_t
  snd_pcm_lib_write(struct snd_pcm_substream *substream,
  		  const void __user *buf, snd_pcm_uframes_t frames)
  {

  	return __snd_pcm_lib_xfer(substream, (void __force *)buf, true, frames, false);

  }
  
  static inline snd_pcm_sframes_t
  snd_pcm_lib_read(struct snd_pcm_substream *substream,
  		 void __user *buf, snd_pcm_uframes_t frames)
  {

  	return __snd_pcm_lib_xfer(substream, (void __force *)buf, true, frames, false);

  }
  
  static inline snd_pcm_sframes_t
  snd_pcm_lib_writev(struct snd_pcm_substream *substream,
  		   void __user **bufs, snd_pcm_uframes_t frames)
  {

  	return __snd_pcm_lib_xfer(substream, (void *)bufs, false, frames, false);

  }
  
  static inline snd_pcm_sframes_t
  snd_pcm_lib_readv(struct snd_pcm_substream *substream,
  		  void __user **bufs, snd_pcm_uframes_t frames)
  {

  	return __snd_pcm_lib_xfer(substream, (void *)bufs, false, frames, false);
  }
  
  static inline snd_pcm_sframes_t
  snd_pcm_kernel_write(struct snd_pcm_substream *substream,
  		     const void *buf, snd_pcm_uframes_t frames)
  {
  	return __snd_pcm_lib_xfer(substream, (void *)buf, true, frames, true);
  }
  
  static inline snd_pcm_sframes_t
  snd_pcm_kernel_read(struct snd_pcm_substream *substream,
  		    void *buf, snd_pcm_uframes_t frames)
  {
  	return __snd_pcm_lib_xfer(substream, buf, true, frames, true);
  }
  
  static inline snd_pcm_sframes_t
  snd_pcm_kernel_writev(struct snd_pcm_substream *substream,
  		      void **bufs, snd_pcm_uframes_t frames)
  {
  	return __snd_pcm_lib_xfer(substream, bufs, false, frames, true);
  }
  
  static inline snd_pcm_sframes_t
  snd_pcm_kernel_readv(struct snd_pcm_substream *substream,
  		     void **bufs, snd_pcm_uframes_t frames)
  {
  	return __snd_pcm_lib_xfer(substream, bufs, false, frames, true);

  }

  int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime);

  unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate);

  unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit);

  unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a,
  					 unsigned int rates_b);

  unsigned int snd_pcm_rate_range_to_bits(unsigned int rate_min,
  					unsigned int rate_max);

  /**
   * snd_pcm_set_runtime_buffer - Set the PCM runtime buffer
   * @substream: PCM substream to set
   * @bufp: the buffer information, NULL to clear
   *
   * Copy the buffer information to runtime->dma_buffer when @bufp is non-NULL.
   * Otherwise it clears the current buffer information.
   */

  static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,

  					      struct snd_dma_buffer *bufp)
  {

  	struct snd_pcm_runtime *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;
  	}
  }

  /**
   * snd_pcm_gettime - Fill the timespec depending on the timestamp mode
   * @runtime: PCM runtime instance
   * @tv: timespec to fill
   */

  static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime,
  				   struct timespec *tv)
  {

  	switch (runtime->tstamp_type) {
  	case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC:

  		ktime_get_ts(tv);

  		break;
  	case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC_RAW:
  		getrawmonotonic(tv);
  		break;
  	default:

  		getnstimeofday(tv);

  		break;
  	}

  }

  /*
   *  Memory
   */

  void snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
  void snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
  void snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,

  				  int type, struct device *data,
  				  size_t size, size_t max);

  void snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,

  					  int type, void *data,
  					  size_t size, size_t max);

  int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
  int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);

  int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream,
  				      size_t size, gfp_t gfp_flags);
  int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream);
  struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream,
  					  unsigned long offset);

  /**
   * snd_pcm_lib_alloc_vmalloc_buffer - allocate virtual DMA buffer
   * @substream: the substream to allocate the buffer to
   * @size: the requested buffer size, in bytes
   *
   * Allocates the PCM substream buffer using vmalloc(), i.e., the memory is
   * contiguous in kernel virtual space, but not in physical memory.  Use this
   * if the buffer is accessed by kernel code but not by device DMA.
   *

   * Return: 1 if the buffer was changed, 0 if not changed, or a negative error

   * code.
   */

  static inline int snd_pcm_lib_alloc_vmalloc_buffer
  			(struct snd_pcm_substream *substream, size_t size)
  {
  	return _snd_pcm_lib_alloc_vmalloc_buffer(substream, size,
  						 GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
  }

  /**
   * snd_pcm_lib_alloc_vmalloc_32_buffer - allocate 32-bit-addressable buffer
   * @substream: the substream to allocate the buffer to
   * @size: the requested buffer size, in bytes
   *
   * This function works like snd_pcm_lib_alloc_vmalloc_buffer(), but uses
   * vmalloc_32(), i.e., the pages are allocated from 32-bit-addressable memory.

   *
   * Return: 1 if the buffer was changed, 0 if not changed, or a negative error
   * code.

   */

  static inline int snd_pcm_lib_alloc_vmalloc_32_buffer
  			(struct snd_pcm_substream *substream, size_t size)
  {
  	return _snd_pcm_lib_alloc_vmalloc_buffer(substream, size,
  						 GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
  }

  #define snd_pcm_get_dma_buf(substream) ((substream)->runtime->dma_buffer_p)

  #ifdef CONFIG_SND_DMA_SGBUF

  /*
   * SG-buffer handling
   */
  #define snd_pcm_substream_sgbuf(substream) \

  	snd_pcm_get_dma_buf(substream)->private_data

  
  struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream,
  				    unsigned long offset);

  #else /* !SND_DMA_SGBUF */
  /*
   * fake using a continuous buffer
   */

  #define snd_pcm_sgbuf_ops_page	NULL
  #endif /* SND_DMA_SGBUF */

  /**
   * snd_pcm_sgbuf_get_addr - Get the DMA address at the corresponding offset
   * @substream: PCM substream
   * @ofs: byte offset
   */

  static inline dma_addr_t
  snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
  {

  	return snd_sgbuf_get_addr(snd_pcm_get_dma_buf(substream), ofs);

  }

  /**
   * snd_pcm_sgbuf_get_ptr - Get the virtual address at the corresponding offset
   * @substream: PCM substream
   * @ofs: byte offset
   */

  static inline void *
  snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
  {

  	return snd_sgbuf_get_ptr(snd_pcm_get_dma_buf(substream), ofs);

  }

  /**
   * snd_pcm_sgbuf_chunk_size - Compute the max size that fits within the contig.
   * page from the given size
   * @substream: PCM substream
   * @ofs: byte offset
   * @size: byte size to examine
   */

  static inline unsigned int
  snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
  			     unsigned int ofs, unsigned int size)
  {
  	return snd_sgbuf_get_chunk_size(snd_pcm_get_dma_buf(substream), ofs, size);
  }

  /**
   * snd_pcm_mmap_data_open - increase the mmap counter
   * @area: VMA
   *
   * PCM mmap callback should handle this counter properly
   */

  static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
  {

  	struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;

  	atomic_inc(&substream->mmap_count);

  }

  /**
   * snd_pcm_mmap_data_close - decrease the mmap counter
   * @area: VMA
   *
   * PCM mmap callback should handle this counter properly
   */

  static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
  {

  	struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;

  	atomic_dec(&substream->mmap_count);

  }

  int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
  			     struct vm_area_struct *area);

  /* 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(struct snd_pcm_substream *substream, struct vm_area_struct *area);

  #else
  #define SNDRV_PCM_INFO_MMAP_IOMEM	0
  #define snd_pcm_lib_mmap_iomem	NULL
  #endif

  /**
   * snd_pcm_limit_isa_dma_size - Get the max size fitting with ISA DMA transfer
   * @dma: DMA number
   * @max: pointer to store the max size
   */

  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))

  #define PCM_RUNTIME_CHECK(sub) snd_BUG_ON(!(sub) || !(sub)->runtime)

  const char *snd_pcm_format_name(snd_pcm_format_t format);

  /**

   * snd_pcm_stream_str - Get a string naming the direction of a stream
   * @substream: the pcm substream instance

   *
   * Return: A string naming the direction of the stream.

   */
  static inline const char *snd_pcm_stream_str(struct snd_pcm_substream *substream)
  {
  	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
  		return "Playback";
  	else
  		return "Capture";
  }

  /*
   * PCM channel-mapping control API
   */
  /* array element of channel maps */
  struct snd_pcm_chmap_elem {
  	unsigned char channels;
  	unsigned char map[15];
  };
  
  /* channel map information; retrieved via snd_kcontrol_chip() */
  struct snd_pcm_chmap {
  	struct snd_pcm *pcm;	/* assigned PCM instance */
  	int stream;		/* PLAYBACK or CAPTURE */
  	struct snd_kcontrol *kctl;
  	const struct snd_pcm_chmap_elem *chmap;
  	unsigned int max_channels;
  	unsigned int channel_mask;	/* optional: active channels bitmask */
  	void *private_data;	/* optional: private data pointer */
  };

  /**
   * snd_pcm_chmap_substream - get the PCM substream assigned to the given chmap info
   * @info: chmap information
   * @idx: the substream number index
   */

  static inline struct snd_pcm_substream *
  snd_pcm_chmap_substream(struct snd_pcm_chmap *info, unsigned int idx)
  {
  	struct snd_pcm_substream *s;
  	for (s = info->pcm->streams[info->stream].substream; s; s = s->next)
  		if (s->number == idx)
  			return s;
  	return NULL;
  }
  
  /* ALSA-standard channel maps (RL/RR prior to C/LFE) */
  extern const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[];
  /* Other world's standard channel maps (C/LFE prior to RL/RR) */
  extern const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[];
  
  /* bit masks to be passed to snd_pcm_chmap.channel_mask field */
  #define SND_PCM_CHMAP_MASK_24	((1U << 2) | (1U << 4))
  #define SND_PCM_CHMAP_MASK_246	(SND_PCM_CHMAP_MASK_24 | (1U << 6))
  #define SND_PCM_CHMAP_MASK_2468	(SND_PCM_CHMAP_MASK_246 | (1U << 8))
  
  int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
  			   const struct snd_pcm_chmap_elem *chmap,
  			   int max_channels,
  			   unsigned long private_value,
  			   struct snd_pcm_chmap **info_ret);

  /**
   * pcm_format_to_bits - Strong-typed conversion of pcm_format to bitwise
   * @pcm_format: PCM format
   */

  static inline u64 pcm_format_to_bits(snd_pcm_format_t pcm_format)
  {
  	return 1ULL << (__force int) pcm_format;
  }

  /* printk helpers */
  #define pcm_err(pcm, fmt, args...) \
  	dev_err((pcm)->card->dev, fmt, ##args)
  #define pcm_warn(pcm, fmt, args...) \
  	dev_warn((pcm)->card->dev, fmt, ##args)
  #define pcm_dbg(pcm, fmt, args...) \
  	dev_dbg((pcm)->card->dev, fmt, ##args)

  #endif /* __SOUND_PCM_H */