linux/include/sound/pcm.h
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   1#ifndef __SOUND_PCM_H
   2#define __SOUND_PCM_H
   3
   4/*
   5 *  Digital Audio (PCM) abstract layer
   6 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   7 *                   Abramo Bagnara <abramo@alsa-project.org>
   8 *
   9 *
  10 *   This program is free software; you can redistribute it and/or modify
  11 *   it under the terms of the GNU General Public License as published by
  12 *   the Free Software Foundation; either version 2 of the License, or
  13 *   (at your option) any later version.
  14 *
  15 *   This program is distributed in the hope that it will be useful,
  16 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 *   GNU General Public License for more details.
  19 *
  20 *   You should have received a copy of the GNU General Public License
  21 *   along with this program; if not, write to the Free Software
  22 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  23 *
  24 */
  25
  26#include <sound/asound.h>
  27#include <sound/memalloc.h>
  28#include <sound/minors.h>
  29#include <linux/poll.h>
  30#include <linux/mm.h>
  31#include <linux/bitops.h>
  32#include <linux/pm_qos.h>
  33
  34#define snd_pcm_substream_chip(substream) ((substream)->private_data)
  35#define snd_pcm_chip(pcm) ((pcm)->private_data)
  36
  37#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
  38#include <sound/pcm_oss.h>
  39#endif
  40
  41/*
  42 *  Hardware (lowlevel) section
  43 */
  44
  45struct snd_pcm_hardware {
  46        unsigned int info;              /* SNDRV_PCM_INFO_* */
  47        u64 formats;                    /* SNDRV_PCM_FMTBIT_* */
  48        unsigned int rates;             /* SNDRV_PCM_RATE_* */
  49        unsigned int rate_min;          /* min rate */
  50        unsigned int rate_max;          /* max rate */
  51        unsigned int channels_min;      /* min channels */
  52        unsigned int channels_max;      /* max channels */
  53        size_t buffer_bytes_max;        /* max buffer size */
  54        size_t period_bytes_min;        /* min period size */
  55        size_t period_bytes_max;        /* max period size */
  56        unsigned int periods_min;       /* min # of periods */
  57        unsigned int periods_max;       /* max # of periods */
  58        size_t fifo_size;               /* fifo size in bytes */
  59};
  60
  61struct snd_pcm_substream;
  62
  63struct snd_pcm_ops {
  64        int (*open)(struct snd_pcm_substream *substream);
  65        int (*close)(struct snd_pcm_substream *substream);
  66        int (*ioctl)(struct snd_pcm_substream * substream,
  67                     unsigned int cmd, void *arg);
  68        int (*hw_params)(struct snd_pcm_substream *substream,
  69                         struct snd_pcm_hw_params *params);
  70        int (*hw_free)(struct snd_pcm_substream *substream);
  71        int (*prepare)(struct snd_pcm_substream *substream);
  72        int (*trigger)(struct snd_pcm_substream *substream, int cmd);
  73        snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *substream);
  74        int (*wall_clock)(struct snd_pcm_substream *substream,
  75                          struct timespec *audio_ts);
  76        int (*copy)(struct snd_pcm_substream *substream, int channel,
  77                    snd_pcm_uframes_t pos,
  78                    void __user *buf, snd_pcm_uframes_t count);
  79        int (*silence)(struct snd_pcm_substream *substream, int channel, 
  80                       snd_pcm_uframes_t pos, snd_pcm_uframes_t count);
  81        struct page *(*page)(struct snd_pcm_substream *substream,
  82                             unsigned long offset);
  83        int (*mmap)(struct snd_pcm_substream *substream, struct vm_area_struct *vma);
  84        int (*ack)(struct snd_pcm_substream *substream);
  85};
  86
  87/*
  88 *
  89 */
  90
  91#if defined(CONFIG_SND_DYNAMIC_MINORS)
  92#define SNDRV_PCM_DEVICES       (SNDRV_OS_MINORS-2)
  93#else
  94#define SNDRV_PCM_DEVICES       8
  95#endif
  96
  97#define SNDRV_PCM_IOCTL1_FALSE          ((void *)0)
  98#define SNDRV_PCM_IOCTL1_TRUE           ((void *)1)
  99
 100#define SNDRV_PCM_IOCTL1_RESET          0
 101#define SNDRV_PCM_IOCTL1_INFO           1
 102#define SNDRV_PCM_IOCTL1_CHANNEL_INFO   2
 103#define SNDRV_PCM_IOCTL1_GSTATE         3
 104#define SNDRV_PCM_IOCTL1_FIFO_SIZE      4
 105
 106#define SNDRV_PCM_TRIGGER_STOP          0
 107#define SNDRV_PCM_TRIGGER_START         1
 108#define SNDRV_PCM_TRIGGER_PAUSE_PUSH    3
 109#define SNDRV_PCM_TRIGGER_PAUSE_RELEASE 4
 110#define SNDRV_PCM_TRIGGER_SUSPEND       5
 111#define SNDRV_PCM_TRIGGER_RESUME        6
 112
 113#define SNDRV_PCM_POS_XRUN              ((snd_pcm_uframes_t)-1)
 114
 115/* If you change this don't forget to change rates[] table in pcm_native.c */
 116#define SNDRV_PCM_RATE_5512             (1<<0)          /* 5512Hz */
 117#define SNDRV_PCM_RATE_8000             (1<<1)          /* 8000Hz */
 118#define SNDRV_PCM_RATE_11025            (1<<2)          /* 11025Hz */
 119#define SNDRV_PCM_RATE_16000            (1<<3)          /* 16000Hz */
 120#define SNDRV_PCM_RATE_22050            (1<<4)          /* 22050Hz */
 121#define SNDRV_PCM_RATE_32000            (1<<5)          /* 32000Hz */
 122#define SNDRV_PCM_RATE_44100            (1<<6)          /* 44100Hz */
 123#define SNDRV_PCM_RATE_48000            (1<<7)          /* 48000Hz */
 124#define SNDRV_PCM_RATE_64000            (1<<8)          /* 64000Hz */
 125#define SNDRV_PCM_RATE_88200            (1<<9)          /* 88200Hz */
 126#define SNDRV_PCM_RATE_96000            (1<<10)         /* 96000Hz */
 127#define SNDRV_PCM_RATE_176400           (1<<11)         /* 176400Hz */
 128#define SNDRV_PCM_RATE_192000           (1<<12)         /* 192000Hz */
 129
 130#define SNDRV_PCM_RATE_CONTINUOUS       (1<<30)         /* continuous range */
 131#define SNDRV_PCM_RATE_KNOT             (1<<31)         /* supports more non-continuos rates */
 132
 133#define SNDRV_PCM_RATE_8000_44100       (SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_11025|\
 134                                         SNDRV_PCM_RATE_16000|SNDRV_PCM_RATE_22050|\
 135                                         SNDRV_PCM_RATE_32000|SNDRV_PCM_RATE_44100)
 136#define SNDRV_PCM_RATE_8000_48000       (SNDRV_PCM_RATE_8000_44100|SNDRV_PCM_RATE_48000)
 137#define SNDRV_PCM_RATE_8000_96000       (SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_64000|\
 138                                         SNDRV_PCM_RATE_88200|SNDRV_PCM_RATE_96000)
 139#define SNDRV_PCM_RATE_8000_192000      (SNDRV_PCM_RATE_8000_96000|SNDRV_PCM_RATE_176400|\
 140                                         SNDRV_PCM_RATE_192000)
 141#define _SNDRV_PCM_FMTBIT(fmt)          (1ULL << (__force int)SNDRV_PCM_FORMAT_##fmt)
 142#define SNDRV_PCM_FMTBIT_S8             _SNDRV_PCM_FMTBIT(S8)
 143#define SNDRV_PCM_FMTBIT_U8             _SNDRV_PCM_FMTBIT(U8)
 144#define SNDRV_PCM_FMTBIT_S16_LE         _SNDRV_PCM_FMTBIT(S16_LE)
 145#define SNDRV_PCM_FMTBIT_S16_BE         _SNDRV_PCM_FMTBIT(S16_BE)
 146#define SNDRV_PCM_FMTBIT_U16_LE         _SNDRV_PCM_FMTBIT(U16_LE)
 147#define SNDRV_PCM_FMTBIT_U16_BE         _SNDRV_PCM_FMTBIT(U16_BE)
 148#define SNDRV_PCM_FMTBIT_S24_LE         _SNDRV_PCM_FMTBIT(S24_LE)
 149#define SNDRV_PCM_FMTBIT_S24_BE         _SNDRV_PCM_FMTBIT(S24_BE)
 150#define SNDRV_PCM_FMTBIT_U24_LE         _SNDRV_PCM_FMTBIT(U24_LE)
 151#define SNDRV_PCM_FMTBIT_U24_BE         _SNDRV_PCM_FMTBIT(U24_BE)
 152#define SNDRV_PCM_FMTBIT_S32_LE         _SNDRV_PCM_FMTBIT(S32_LE)
 153#define SNDRV_PCM_FMTBIT_S32_BE         _SNDRV_PCM_FMTBIT(S32_BE)
 154#define SNDRV_PCM_FMTBIT_U32_LE         _SNDRV_PCM_FMTBIT(U32_LE)
 155#define SNDRV_PCM_FMTBIT_U32_BE         _SNDRV_PCM_FMTBIT(U32_BE)
 156#define SNDRV_PCM_FMTBIT_FLOAT_LE       _SNDRV_PCM_FMTBIT(FLOAT_LE)
 157#define SNDRV_PCM_FMTBIT_FLOAT_BE       _SNDRV_PCM_FMTBIT(FLOAT_BE)
 158#define SNDRV_PCM_FMTBIT_FLOAT64_LE     _SNDRV_PCM_FMTBIT(FLOAT64_LE)
 159#define SNDRV_PCM_FMTBIT_FLOAT64_BE     _SNDRV_PCM_FMTBIT(FLOAT64_BE)
 160#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_LE)
 161#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_BE)
 162#define SNDRV_PCM_FMTBIT_MU_LAW         _SNDRV_PCM_FMTBIT(MU_LAW)
 163#define SNDRV_PCM_FMTBIT_A_LAW          _SNDRV_PCM_FMTBIT(A_LAW)
 164#define SNDRV_PCM_FMTBIT_IMA_ADPCM      _SNDRV_PCM_FMTBIT(IMA_ADPCM)
 165#define SNDRV_PCM_FMTBIT_MPEG           _SNDRV_PCM_FMTBIT(MPEG)
 166#define SNDRV_PCM_FMTBIT_GSM            _SNDRV_PCM_FMTBIT(GSM)
 167#define SNDRV_PCM_FMTBIT_SPECIAL        _SNDRV_PCM_FMTBIT(SPECIAL)
 168#define SNDRV_PCM_FMTBIT_S24_3LE        _SNDRV_PCM_FMTBIT(S24_3LE)
 169#define SNDRV_PCM_FMTBIT_U24_3LE        _SNDRV_PCM_FMTBIT(U24_3LE)
 170#define SNDRV_PCM_FMTBIT_S24_3BE        _SNDRV_PCM_FMTBIT(S24_3BE)
 171#define SNDRV_PCM_FMTBIT_U24_3BE        _SNDRV_PCM_FMTBIT(U24_3BE)
 172#define SNDRV_PCM_FMTBIT_S20_3LE        _SNDRV_PCM_FMTBIT(S20_3LE)
 173#define SNDRV_PCM_FMTBIT_U20_3LE        _SNDRV_PCM_FMTBIT(U20_3LE)
 174#define SNDRV_PCM_FMTBIT_S20_3BE        _SNDRV_PCM_FMTBIT(S20_3BE)
 175#define SNDRV_PCM_FMTBIT_U20_3BE        _SNDRV_PCM_FMTBIT(U20_3BE)
 176#define SNDRV_PCM_FMTBIT_S18_3LE        _SNDRV_PCM_FMTBIT(S18_3LE)
 177#define SNDRV_PCM_FMTBIT_U18_3LE        _SNDRV_PCM_FMTBIT(U18_3LE)
 178#define SNDRV_PCM_FMTBIT_S18_3BE        _SNDRV_PCM_FMTBIT(S18_3BE)
 179#define SNDRV_PCM_FMTBIT_U18_3BE        _SNDRV_PCM_FMTBIT(U18_3BE)
 180#define SNDRV_PCM_FMTBIT_G723_24        _SNDRV_PCM_FMTBIT(G723_24)
 181#define SNDRV_PCM_FMTBIT_G723_24_1B     _SNDRV_PCM_FMTBIT(G723_24_1B)
 182#define SNDRV_PCM_FMTBIT_G723_40        _SNDRV_PCM_FMTBIT(G723_40)
 183#define SNDRV_PCM_FMTBIT_G723_40_1B     _SNDRV_PCM_FMTBIT(G723_40_1B)
 184#define SNDRV_PCM_FMTBIT_DSD_U8         _SNDRV_PCM_FMTBIT(DSD_U8)
 185#define SNDRV_PCM_FMTBIT_DSD_U16_LE     _SNDRV_PCM_FMTBIT(DSD_U16_LE)
 186
 187#ifdef SNDRV_LITTLE_ENDIAN
 188#define SNDRV_PCM_FMTBIT_S16            SNDRV_PCM_FMTBIT_S16_LE
 189#define SNDRV_PCM_FMTBIT_U16            SNDRV_PCM_FMTBIT_U16_LE
 190#define SNDRV_PCM_FMTBIT_S24            SNDRV_PCM_FMTBIT_S24_LE
 191#define SNDRV_PCM_FMTBIT_U24            SNDRV_PCM_FMTBIT_U24_LE
 192#define SNDRV_PCM_FMTBIT_S32            SNDRV_PCM_FMTBIT_S32_LE
 193#define SNDRV_PCM_FMTBIT_U32            SNDRV_PCM_FMTBIT_U32_LE
 194#define SNDRV_PCM_FMTBIT_FLOAT          SNDRV_PCM_FMTBIT_FLOAT_LE
 195#define SNDRV_PCM_FMTBIT_FLOAT64        SNDRV_PCM_FMTBIT_FLOAT64_LE
 196#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE
 197#endif
 198#ifdef SNDRV_BIG_ENDIAN
 199#define SNDRV_PCM_FMTBIT_S16            SNDRV_PCM_FMTBIT_S16_BE
 200#define SNDRV_PCM_FMTBIT_U16            SNDRV_PCM_FMTBIT_U16_BE
 201#define SNDRV_PCM_FMTBIT_S24            SNDRV_PCM_FMTBIT_S24_BE
 202#define SNDRV_PCM_FMTBIT_U24            SNDRV_PCM_FMTBIT_U24_BE
 203#define SNDRV_PCM_FMTBIT_S32            SNDRV_PCM_FMTBIT_S32_BE
 204#define SNDRV_PCM_FMTBIT_U32            SNDRV_PCM_FMTBIT_U32_BE
 205#define SNDRV_PCM_FMTBIT_FLOAT          SNDRV_PCM_FMTBIT_FLOAT_BE
 206#define SNDRV_PCM_FMTBIT_FLOAT64        SNDRV_PCM_FMTBIT_FLOAT64_BE
 207#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE
 208#endif
 209
 210struct snd_pcm_file {
 211        struct snd_pcm_substream *substream;
 212        int no_compat_mmap;
 213};
 214
 215struct snd_pcm_hw_rule;
 216typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params,
 217                                      struct snd_pcm_hw_rule *rule);
 218
 219struct snd_pcm_hw_rule {
 220        unsigned int cond;
 221        snd_pcm_hw_rule_func_t func;
 222        int var;
 223        int deps[4];
 224        void *private;
 225};
 226
 227struct snd_pcm_hw_constraints {
 228        struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK - 
 229                         SNDRV_PCM_HW_PARAM_FIRST_MASK + 1];
 230        struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL -
 231                             SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
 232        unsigned int rules_num;
 233        unsigned int rules_all;
 234        struct snd_pcm_hw_rule *rules;
 235};
 236
 237static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs,
 238                                            snd_pcm_hw_param_t var)
 239{
 240        return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 241}
 242
 243static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs,
 244                                                    snd_pcm_hw_param_t var)
 245{
 246        return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 247}
 248
 249struct snd_ratnum {
 250        unsigned int num;
 251        unsigned int den_min, den_max, den_step;
 252};
 253
 254struct snd_ratden {
 255        unsigned int num_min, num_max, num_step;
 256        unsigned int den;
 257};
 258
 259struct snd_pcm_hw_constraint_ratnums {
 260        int nrats;
 261        struct snd_ratnum *rats;
 262};
 263
 264struct snd_pcm_hw_constraint_ratdens {
 265        int nrats;
 266        struct snd_ratden *rats;
 267};
 268
 269struct snd_pcm_hw_constraint_list {
 270        unsigned int count;
 271        const unsigned int *list;
 272        unsigned int mask;
 273};
 274
 275struct snd_pcm_hwptr_log;
 276
 277struct snd_pcm_runtime {
 278        /* -- Status -- */
 279        struct snd_pcm_substream *trigger_master;
 280        struct timespec trigger_tstamp; /* trigger timestamp */
 281        int overrange;
 282        snd_pcm_uframes_t avail_max;
 283        snd_pcm_uframes_t hw_ptr_base;  /* Position at buffer restart */
 284        snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time */
 285        unsigned long hw_ptr_jiffies;   /* Time when hw_ptr is updated */
 286        unsigned long hw_ptr_buffer_jiffies; /* buffer time in jiffies */
 287        snd_pcm_sframes_t delay;        /* extra delay; typically FIFO size */
 288        u64 hw_ptr_wrap;                /* offset for hw_ptr due to boundary wrap-around */
 289
 290        /* -- HW params -- */
 291        snd_pcm_access_t access;        /* access mode */
 292        snd_pcm_format_t format;        /* SNDRV_PCM_FORMAT_* */
 293        snd_pcm_subformat_t subformat;  /* subformat */
 294        unsigned int rate;              /* rate in Hz */
 295        unsigned int channels;          /* channels */
 296        snd_pcm_uframes_t period_size;  /* period size */
 297        unsigned int periods;           /* periods */
 298        snd_pcm_uframes_t buffer_size;  /* buffer size */
 299        snd_pcm_uframes_t min_align;    /* Min alignment for the format */
 300        size_t byte_align;
 301        unsigned int frame_bits;
 302        unsigned int sample_bits;
 303        unsigned int info;
 304        unsigned int rate_num;
 305        unsigned int rate_den;
 306        unsigned int no_period_wakeup: 1;
 307
 308        /* -- SW params -- */
 309        int tstamp_mode;                /* mmap timestamp is updated */
 310        unsigned int period_step;
 311        snd_pcm_uframes_t start_threshold;
 312        snd_pcm_uframes_t stop_threshold;
 313        snd_pcm_uframes_t silence_threshold; /* Silence filling happens when
 314                                                noise is nearest than this */
 315        snd_pcm_uframes_t silence_size; /* Silence filling size */
 316        snd_pcm_uframes_t boundary;     /* pointers wrap point */
 317
 318        snd_pcm_uframes_t silence_start; /* starting pointer to silence area */
 319        snd_pcm_uframes_t silence_filled; /* size filled with silence */
 320
 321        union snd_pcm_sync_id sync;     /* hardware synchronization ID */
 322
 323        /* -- mmap -- */
 324        struct snd_pcm_mmap_status *status;
 325        struct snd_pcm_mmap_control *control;
 326
 327        /* -- locking / scheduling -- */
 328        snd_pcm_uframes_t twake;        /* do transfer (!poll) wakeup if non-zero */
 329        wait_queue_head_t sleep;        /* poll sleep */
 330        wait_queue_head_t tsleep;       /* transfer sleep */
 331        struct fasync_struct *fasync;
 332
 333        /* -- private section -- */
 334        void *private_data;
 335        void (*private_free)(struct snd_pcm_runtime *runtime);
 336
 337        /* -- hardware description -- */
 338        struct snd_pcm_hardware hw;
 339        struct snd_pcm_hw_constraints hw_constraints;
 340
 341        /* -- interrupt callbacks -- */
 342        void (*transfer_ack_begin)(struct snd_pcm_substream *substream);
 343        void (*transfer_ack_end)(struct snd_pcm_substream *substream);
 344
 345        /* -- timer -- */
 346        unsigned int timer_resolution;  /* timer resolution */
 347        int tstamp_type;                /* timestamp type */
 348
 349        /* -- DMA -- */           
 350        unsigned char *dma_area;        /* DMA area */
 351        dma_addr_t dma_addr;            /* physical bus address (not accessible from main CPU) */
 352        size_t dma_bytes;               /* size of DMA area */
 353
 354        struct snd_dma_buffer *dma_buffer_p;    /* allocated buffer */
 355
 356#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 357        /* -- OSS things -- */
 358        struct snd_pcm_oss_runtime oss;
 359#endif
 360
 361#ifdef CONFIG_SND_PCM_XRUN_DEBUG
 362        struct snd_pcm_hwptr_log *hwptr_log;
 363#endif
 364};
 365
 366struct snd_pcm_group {          /* keep linked substreams */
 367        spinlock_t lock;
 368        struct list_head substreams;
 369        int count;
 370};
 371
 372struct pid;
 373
 374struct snd_pcm_substream {
 375        struct snd_pcm *pcm;
 376        struct snd_pcm_str *pstr;
 377        void *private_data;             /* copied from pcm->private_data */
 378        int number;
 379        char name[32];                  /* substream name */
 380        int stream;                     /* stream (direction) */
 381        struct pm_qos_request latency_pm_qos_req; /* pm_qos request */
 382        size_t buffer_bytes_max;        /* limit ring buffer size */
 383        struct snd_dma_buffer dma_buffer;
 384        unsigned int dma_buf_id;
 385        size_t dma_max;
 386        /* -- hardware operations -- */
 387        const struct snd_pcm_ops *ops;
 388        /* -- runtime information -- */
 389        struct snd_pcm_runtime *runtime;
 390        /* -- timer section -- */
 391        struct snd_timer *timer;                /* timer */
 392        unsigned timer_running: 1;      /* time is running */
 393        /* -- next substream -- */
 394        struct snd_pcm_substream *next;
 395        /* -- linked substreams -- */
 396        struct list_head link_list;     /* linked list member */
 397        struct snd_pcm_group self_group;        /* fake group for non linked substream (with substream lock inside) */
 398        struct snd_pcm_group *group;            /* pointer to current group */
 399        /* -- assigned files -- */
 400        void *file;
 401        int ref_count;
 402        atomic_t mmap_count;
 403        unsigned int f_flags;
 404        void (*pcm_release)(struct snd_pcm_substream *);
 405        struct pid *pid;
 406#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 407        /* -- OSS things -- */
 408        struct snd_pcm_oss_substream oss;
 409#endif
 410#ifdef CONFIG_SND_VERBOSE_PROCFS
 411        struct snd_info_entry *proc_root;
 412        struct snd_info_entry *proc_info_entry;
 413        struct snd_info_entry *proc_hw_params_entry;
 414        struct snd_info_entry *proc_sw_params_entry;
 415        struct snd_info_entry *proc_status_entry;
 416        struct snd_info_entry *proc_prealloc_entry;
 417        struct snd_info_entry *proc_prealloc_max_entry;
 418#endif
 419        /* misc flags */
 420        unsigned int hw_opened: 1;
 421};
 422
 423#define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0)
 424
 425
 426struct snd_pcm_str {
 427        int stream;                             /* stream (direction) */
 428        struct snd_pcm *pcm;
 429        /* -- substreams -- */
 430        unsigned int substream_count;
 431        unsigned int substream_opened;
 432        struct snd_pcm_substream *substream;
 433#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 434        /* -- OSS things -- */
 435        struct snd_pcm_oss_stream oss;
 436#endif
 437#ifdef CONFIG_SND_VERBOSE_PROCFS
 438        struct snd_info_entry *proc_root;
 439        struct snd_info_entry *proc_info_entry;
 440#ifdef CONFIG_SND_PCM_XRUN_DEBUG
 441        unsigned int xrun_debug;        /* 0 = disabled, 1 = verbose, 2 = stacktrace */
 442        struct snd_info_entry *proc_xrun_debug_entry;
 443#endif
 444#endif
 445        struct snd_kcontrol *chmap_kctl; /* channel-mapping controls */
 446};
 447
 448struct snd_pcm {
 449        struct snd_card *card;
 450        struct list_head list;
 451        int device; /* device number */
 452        unsigned int info_flags;
 453        unsigned short dev_class;
 454        unsigned short dev_subclass;
 455        char id[64];
 456        char name[80];
 457        struct snd_pcm_str streams[2];
 458        struct mutex open_mutex;
 459        wait_queue_head_t open_wait;
 460        void *private_data;
 461        void (*private_free) (struct snd_pcm *pcm);
 462        struct device *dev; /* actual hw device this belongs to */
 463        bool internal; /* pcm is for internal use only */
 464#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 465        struct snd_pcm_oss oss;
 466#endif
 467};
 468
 469struct snd_pcm_notify {
 470        int (*n_register) (struct snd_pcm * pcm);
 471        int (*n_disconnect) (struct snd_pcm * pcm);
 472        int (*n_unregister) (struct snd_pcm * pcm);
 473        struct list_head list;
 474};
 475
 476/*
 477 *  Registering
 478 */
 479
 480extern const struct file_operations snd_pcm_f_ops[2];
 481
 482int snd_pcm_new(struct snd_card *card, const char *id, int device,
 483                int playback_count, int capture_count,
 484                struct snd_pcm **rpcm);
 485int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
 486                int playback_count, int capture_count,
 487                struct snd_pcm **rpcm);
 488int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
 489
 490int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
 491
 492/*
 493 *  Native I/O
 494 */
 495
 496extern rwlock_t snd_pcm_link_rwlock;
 497
 498int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
 499int snd_pcm_info_user(struct snd_pcm_substream *substream,
 500                      struct snd_pcm_info __user *info);
 501int snd_pcm_status(struct snd_pcm_substream *substream,
 502                   struct snd_pcm_status *status);
 503int snd_pcm_start(struct snd_pcm_substream *substream);
 504int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t status);
 505int snd_pcm_drain_done(struct snd_pcm_substream *substream);
 506#ifdef CONFIG_PM
 507int snd_pcm_suspend(struct snd_pcm_substream *substream);
 508int snd_pcm_suspend_all(struct snd_pcm *pcm);
 509#endif
 510int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
 511int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
 512                           struct snd_pcm_substream **rsubstream);
 513void snd_pcm_release_substream(struct snd_pcm_substream *substream);
 514int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
 515                             struct snd_pcm_substream **rsubstream);
 516void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
 517void snd_pcm_vma_notify_data(void *client, void *data);
 518int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
 519
 520
 521#ifdef CONFIG_SND_DEBUG
 522void snd_pcm_debug_name(struct snd_pcm_substream *substream,
 523                           char *name, size_t len);
 524#else
 525static inline void
 526snd_pcm_debug_name(struct snd_pcm_substream *substream, char *buf, size_t size)
 527{
 528        *buf = 0;
 529}
 530#endif
 531
 532/*
 533 *  PCM library
 534 */
 535
 536static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
 537{
 538        return substream->group != &substream->self_group;
 539}
 540
 541static inline void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
 542{
 543        read_lock(&snd_pcm_link_rwlock);
 544        spin_lock(&substream->self_group.lock);
 545}
 546
 547static inline void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
 548{
 549        spin_unlock(&substream->self_group.lock);
 550        read_unlock(&snd_pcm_link_rwlock);
 551}
 552
 553static inline void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
 554{
 555        read_lock_irq(&snd_pcm_link_rwlock);
 556        spin_lock(&substream->self_group.lock);
 557}
 558
 559static inline void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
 560{
 561        spin_unlock(&substream->self_group.lock);
 562        read_unlock_irq(&snd_pcm_link_rwlock);
 563}
 564
 565#define snd_pcm_stream_lock_irqsave(substream, flags) \
 566do { \
 567        read_lock_irqsave(&snd_pcm_link_rwlock, (flags)); \
 568        spin_lock(&substream->self_group.lock); \
 569} while (0)
 570
 571#define snd_pcm_stream_unlock_irqrestore(substream, flags) \
 572do { \
 573        spin_unlock(&substream->self_group.lock); \
 574        read_unlock_irqrestore(&snd_pcm_link_rwlock, (flags)); \
 575} while (0)
 576
 577#define snd_pcm_group_for_each_entry(s, substream) \
 578        list_for_each_entry(s, &substream->group->substreams, link_list)
 579
 580static inline int snd_pcm_running(struct snd_pcm_substream *substream)
 581{
 582        return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 583                (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
 584                 substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
 585}
 586
 587static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
 588{
 589        return size * 8 / runtime->sample_bits;
 590}
 591
 592static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
 593{
 594        return size * 8 / runtime->frame_bits;
 595}
 596
 597static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
 598{
 599        return size * runtime->sample_bits / 8;
 600}
 601
 602static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
 603{
 604        return size * runtime->frame_bits / 8;
 605}
 606
 607static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
 608{
 609        return bytes % runtime->byte_align == 0;
 610}
 611
 612static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
 613{
 614        struct snd_pcm_runtime *runtime = substream->runtime;
 615        return frames_to_bytes(runtime, runtime->buffer_size);
 616}
 617
 618static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
 619{
 620        struct snd_pcm_runtime *runtime = substream->runtime;
 621        return frames_to_bytes(runtime, runtime->period_size);
 622}
 623
 624/*
 625 *  result is: 0 ... (boundary - 1)
 626 */
 627static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
 628{
 629        snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
 630        if (avail < 0)
 631                avail += runtime->boundary;
 632        else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
 633                avail -= runtime->boundary;
 634        return avail;
 635}
 636
 637/*
 638 *  result is: 0 ... (boundary - 1)
 639 */
 640static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
 641{
 642        snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
 643        if (avail < 0)
 644                avail += runtime->boundary;
 645        return avail;
 646}
 647
 648static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
 649{
 650        return runtime->buffer_size - snd_pcm_playback_avail(runtime);
 651}
 652
 653static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
 654{
 655        return runtime->buffer_size - snd_pcm_capture_avail(runtime);
 656}
 657
 658/**
 659 * snd_pcm_playback_ready - check whether the playback buffer is available
 660 * @substream: the pcm substream instance
 661 *
 662 * Checks whether enough free space is available on the playback buffer.
 663 *
 664 * Return: Non-zero if available, or zero if not.
 665 */
 666static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
 667{
 668        struct snd_pcm_runtime *runtime = substream->runtime;
 669        return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
 670}
 671
 672/**
 673 * snd_pcm_capture_ready - check whether the capture buffer is available
 674 * @substream: the pcm substream instance
 675 *
 676 * Checks whether enough capture data is available on the capture buffer.
 677 *
 678 * Return: Non-zero if available, or zero if not.
 679 */
 680static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
 681{
 682        struct snd_pcm_runtime *runtime = substream->runtime;
 683        return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
 684}
 685
 686/**
 687 * snd_pcm_playback_data - check whether any data exists on the playback buffer
 688 * @substream: the pcm substream instance
 689 *
 690 * Checks whether any data exists on the playback buffer.
 691 *
 692 * Return: Non-zero if any data exists, or zero if not. If stop_threshold
 693 * is bigger or equal to boundary, then this function returns always non-zero.
 694 */
 695static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
 696{
 697        struct snd_pcm_runtime *runtime = substream->runtime;
 698        
 699        if (runtime->stop_threshold >= runtime->boundary)
 700                return 1;
 701        return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
 702}
 703
 704/**
 705 * snd_pcm_playback_empty - check whether the playback buffer is empty
 706 * @substream: the pcm substream instance
 707 *
 708 * Checks whether the playback buffer is empty.
 709 *
 710 * Return: Non-zero if empty, or zero if not.
 711 */
 712static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
 713{
 714        struct snd_pcm_runtime *runtime = substream->runtime;
 715        return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
 716}
 717
 718/**
 719 * snd_pcm_capture_empty - check whether the capture buffer is empty
 720 * @substream: the pcm substream instance
 721 *
 722 * Checks whether the capture buffer is empty.
 723 *
 724 * Return: Non-zero if empty, or zero if not.
 725 */
 726static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
 727{
 728        struct snd_pcm_runtime *runtime = substream->runtime;
 729        return snd_pcm_capture_avail(runtime) == 0;
 730}
 731
 732static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream, 
 733                                        struct snd_pcm_substream *master)
 734{
 735        substream->runtime->trigger_master = master;
 736}
 737
 738static inline int hw_is_mask(int var)
 739{
 740        return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
 741                var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
 742}
 743
 744static inline int hw_is_interval(int var)
 745{
 746        return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
 747                var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
 748}
 749
 750static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
 751                                     snd_pcm_hw_param_t var)
 752{
 753        return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 754}
 755
 756static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
 757                                             snd_pcm_hw_param_t var)
 758{
 759        return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 760}
 761
 762static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
 763                                             snd_pcm_hw_param_t var)
 764{
 765        return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 766}
 767
 768static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
 769                                                     snd_pcm_hw_param_t var)
 770{
 771        return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 772}
 773
 774#define params_channels(p) \
 775        (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_CHANNELS)->min)
 776#define params_rate(p) \
 777        (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_RATE)->min)
 778#define params_period_size(p) \
 779        (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min)
 780#define params_periods(p) \
 781        (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_PERIODS)->min)
 782#define params_buffer_size(p) \
 783        (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min)
 784#define params_buffer_bytes(p) \
 785        (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min)
 786
 787int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
 788void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
 789void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
 790void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b, 
 791                          unsigned int k, struct snd_interval *c);
 792void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
 793                          const struct snd_interval *b, struct snd_interval *c);
 794int snd_interval_list(struct snd_interval *i, unsigned int count,
 795                      const unsigned int *list, unsigned int mask);
 796int snd_interval_ratnum(struct snd_interval *i,
 797                        unsigned int rats_count, struct snd_ratnum *rats,
 798                        unsigned int *nump, unsigned int *denp);
 799
 800void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
 801void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
 802int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
 803
 804int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
 805
 806int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream);
 807int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream);
 808
 809int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 810                               u_int32_t mask);
 811int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 812                                 u_int64_t mask);
 813int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 814                                 unsigned int min, unsigned int max);
 815int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
 816int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime, 
 817                               unsigned int cond,
 818                               snd_pcm_hw_param_t var,
 819                               const struct snd_pcm_hw_constraint_list *l);
 820int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime, 
 821                                  unsigned int cond,
 822                                  snd_pcm_hw_param_t var,
 823                                  struct snd_pcm_hw_constraint_ratnums *r);
 824int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime, 
 825                                  unsigned int cond,
 826                                  snd_pcm_hw_param_t var,
 827                                  struct snd_pcm_hw_constraint_ratdens *r);
 828int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime, 
 829                                 unsigned int cond,
 830                                 unsigned int width,
 831                                 unsigned int msbits);
 832int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
 833                               unsigned int cond,
 834                               snd_pcm_hw_param_t var,
 835                               unsigned long step);
 836int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
 837                               unsigned int cond,
 838                               snd_pcm_hw_param_t var);
 839int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
 840                               unsigned int base_rate);
 841int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
 842                        unsigned int cond,
 843                        int var,
 844                        snd_pcm_hw_rule_func_t func, void *private,
 845                        int dep, ...);
 846
 847int snd_pcm_format_signed(snd_pcm_format_t format);
 848int snd_pcm_format_unsigned(snd_pcm_format_t format);
 849int snd_pcm_format_linear(snd_pcm_format_t format);
 850int snd_pcm_format_little_endian(snd_pcm_format_t format);
 851int snd_pcm_format_big_endian(snd_pcm_format_t format);
 852#if 0 /* just for DocBook */
 853/**
 854 * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
 855 * @format: the format to check
 856 *
 857 * Return: 1 if the given PCM format is CPU-endian, 0 if
 858 * opposite, or a negative error code if endian not specified.
 859 */
 860int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
 861#endif /* DocBook */
 862#ifdef SNDRV_LITTLE_ENDIAN
 863#define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
 864#else
 865#define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
 866#endif
 867int snd_pcm_format_width(snd_pcm_format_t format);                      /* in bits */
 868int snd_pcm_format_physical_width(snd_pcm_format_t format);             /* in bits */
 869ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
 870const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
 871int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
 872snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsigned, int big_endian);
 873
 874void snd_pcm_set_ops(struct snd_pcm * pcm, int direction,
 875                     const struct snd_pcm_ops *ops);
 876void snd_pcm_set_sync(struct snd_pcm_substream *substream);
 877int snd_pcm_lib_interleave_len(struct snd_pcm_substream *substream);
 878int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
 879                      unsigned int cmd, void *arg);                      
 880int snd_pcm_update_state(struct snd_pcm_substream *substream,
 881                         struct snd_pcm_runtime *runtime);
 882int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream);
 883int snd_pcm_playback_xrun_check(struct snd_pcm_substream *substream);
 884int snd_pcm_capture_xrun_check(struct snd_pcm_substream *substream);
 885int snd_pcm_playback_xrun_asap(struct snd_pcm_substream *substream);
 886int snd_pcm_capture_xrun_asap(struct snd_pcm_substream *substream);
 887void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr);
 888void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
 889snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream,
 890                                    const void __user *buf,
 891                                    snd_pcm_uframes_t frames);
 892snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream,
 893                                   void __user *buf, snd_pcm_uframes_t frames);
 894snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
 895                                     void __user **bufs, snd_pcm_uframes_t frames);
 896snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
 897                                    void __user **bufs, snd_pcm_uframes_t frames);
 898
 899extern const struct snd_pcm_hw_constraint_list snd_pcm_known_rates;
 900
 901int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime);
 902unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate);
 903unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit);
 904
 905static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
 906                                              struct snd_dma_buffer *bufp)
 907{
 908        struct snd_pcm_runtime *runtime = substream->runtime;
 909        if (bufp) {
 910                runtime->dma_buffer_p = bufp;
 911                runtime->dma_area = bufp->area;
 912                runtime->dma_addr = bufp->addr;
 913                runtime->dma_bytes = bufp->bytes;
 914        } else {
 915                runtime->dma_buffer_p = NULL;
 916                runtime->dma_area = NULL;
 917                runtime->dma_addr = 0;
 918                runtime->dma_bytes = 0;
 919        }
 920}
 921
 922/*
 923 *  Timer interface
 924 */
 925
 926void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream);
 927void snd_pcm_timer_init(struct snd_pcm_substream *substream);
 928void snd_pcm_timer_done(struct snd_pcm_substream *substream);
 929
 930static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime,
 931                                   struct timespec *tv)
 932{
 933        if (runtime->tstamp_type == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
 934                do_posix_clock_monotonic_gettime(tv);
 935        else
 936                getnstimeofday(tv);
 937}
 938
 939/*
 940 *  Memory
 941 */
 942
 943int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
 944int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
 945int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
 946                                  int type, struct device *data,
 947                                  size_t size, size_t max);
 948int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
 949                                          int type, void *data,
 950                                          size_t size, size_t max);
 951int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
 952int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
 953
 954int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream,
 955                                      size_t size, gfp_t gfp_flags);
 956int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream);
 957struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream,
 958                                          unsigned long offset);
 959#if 0 /* for kernel-doc */
 960/**
 961 * snd_pcm_lib_alloc_vmalloc_buffer - allocate virtual DMA buffer
 962 * @substream: the substream to allocate the buffer to
 963 * @size: the requested buffer size, in bytes
 964 *
 965 * Allocates the PCM substream buffer using vmalloc(), i.e., the memory is
 966 * contiguous in kernel virtual space, but not in physical memory.  Use this
 967 * if the buffer is accessed by kernel code but not by device DMA.
 968 *
 969 * Return: 1 if the buffer was changed, 0 if not changed, or a negative error
 970 * code.
 971 */
 972static int snd_pcm_lib_alloc_vmalloc_buffer
 973                        (struct snd_pcm_substream *substream, size_t size);
 974/**
 975 * snd_pcm_lib_alloc_vmalloc_32_buffer - allocate 32-bit-addressable buffer
 976 * @substream: the substream to allocate the buffer to
 977 * @size: the requested buffer size, in bytes
 978 *
 979 * This function works like snd_pcm_lib_alloc_vmalloc_buffer(), but uses
 980 * vmalloc_32(), i.e., the pages are allocated from 32-bit-addressable memory.
 981 *
 982 * Return: 1 if the buffer was changed, 0 if not changed, or a negative error
 983 * code.
 984 */
 985static int snd_pcm_lib_alloc_vmalloc_32_buffer
 986                        (struct snd_pcm_substream *substream, size_t size);
 987#endif
 988#define snd_pcm_lib_alloc_vmalloc_buffer(subs, size) \
 989        _snd_pcm_lib_alloc_vmalloc_buffer \
 990                        (subs, size, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO)
 991#define snd_pcm_lib_alloc_vmalloc_32_buffer(subs, size) \
 992        _snd_pcm_lib_alloc_vmalloc_buffer \
 993                        (subs, size, GFP_KERNEL | GFP_DMA32 | __GFP_ZERO)
 994
 995#define snd_pcm_get_dma_buf(substream) ((substream)->runtime->dma_buffer_p)
 996
 997#ifdef CONFIG_SND_DMA_SGBUF
 998/*
 999 * SG-buffer handling
1000 */

1001#define snd_pcm_substream_sgbuf(substream) \
1002        snd_pcm_get_dma_buf(substream)->private_data
1003
1004struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream,
1005                                    unsigned long offset);
1006#else /* !SND_DMA_SGBUF */
1007/*
1008 * fake using a continuous buffer
1009 */
1010#define snd_pcm_sgbuf_ops_page  NULL
1011#endif /* SND_DMA_SGBUF */
1012
1013static inline dma_addr_t
1014snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
1015{
1016        return snd_sgbuf_get_addr(snd_pcm_get_dma_buf(substream), ofs);
1017}
1018
1019static inline void *
1020snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
1021{
1022        return snd_sgbuf_get_ptr(snd_pcm_get_dma_buf(substream), ofs);
1023}
1024
1025static inline unsigned int
1026snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
1027                             unsigned int ofs, unsigned int size)
1028{
1029        return snd_sgbuf_get_chunk_size(snd_pcm_get_dma_buf(substream), ofs, size);
1030}
1031
1032/* handle mmap counter - PCM mmap callback should handle this counter properly */
1033static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
1034{
1035        struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1036        atomic_inc(&substream->mmap_count);
1037}
1038
1039static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
1040{
1041        struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1042        atomic_dec(&substream->mmap_count);
1043}
1044
1045int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
1046                             struct vm_area_struct *area);
1047/* mmap for io-memory area */
1048#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
1049#define SNDRV_PCM_INFO_MMAP_IOMEM       SNDRV_PCM_INFO_MMAP
1050int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
1051#else
1052#define SNDRV_PCM_INFO_MMAP_IOMEM       0
1053#define snd_pcm_lib_mmap_iomem  NULL
1054#endif
1055
1056#define snd_pcm_lib_mmap_vmalloc NULL
1057
1058static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
1059{
1060        *max = dma < 4 ? 64 * 1024 : 128 * 1024;
1061}
1062
1063/*
1064 *  Misc
1065 */
1066
1067#define SNDRV_PCM_DEFAULT_CON_SPDIF     (IEC958_AES0_CON_EMPHASIS_NONE|\
1068                                         (IEC958_AES1_CON_ORIGINAL<<8)|\
1069                                         (IEC958_AES1_CON_PCM_CODER<<8)|\
1070                                         (IEC958_AES3_CON_FS_48000<<24))
1071
1072#define PCM_RUNTIME_CHECK(sub) snd_BUG_ON(!(sub) || !(sub)->runtime)
1073
1074const char *snd_pcm_format_name(snd_pcm_format_t format);
1075
1076/**
1077 * snd_pcm_stream_str - Get a string naming the direction of a stream
1078 * @substream: the pcm substream instance
1079 *
1080 * Return: A string naming the direction of the stream.
1081 */
1082static inline const char *snd_pcm_stream_str(struct snd_pcm_substream *substream)
1083{
1084        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1085                return "Playback";
1086        else
1087                return "Capture";
1088}
1089
1090/*
1091 * PCM channel-mapping control API
1092 */
1093/* array element of channel maps */
1094struct snd_pcm_chmap_elem {
1095        unsigned char channels;
1096        unsigned char map[15];
1097};
1098
1099/* channel map information; retrieved via snd_kcontrol_chip() */
1100struct snd_pcm_chmap {
1101        struct snd_pcm *pcm;    /* assigned PCM instance */
1102        int stream;             /* PLAYBACK or CAPTURE */
1103        struct snd_kcontrol *kctl;
1104        const struct snd_pcm_chmap_elem *chmap;
1105        unsigned int max_channels;
1106        unsigned int channel_mask;      /* optional: active channels bitmask */
1107        void *private_data;     /* optional: private data pointer */
1108};
1109
1110/* get the PCM substream assigned to the given chmap info */
1111static inline struct snd_pcm_substream *
1112snd_pcm_chmap_substream(struct snd_pcm_chmap *info, unsigned int idx)
1113{
1114        struct snd_pcm_substream *s;
1115        for (s = info->pcm->streams[info->stream].substream; s; s = s->next)
1116                if (s->number == idx)
1117                        return s;
1118        return NULL;
1119}
1120
1121/* ALSA-standard channel maps (RL/RR prior to C/LFE) */
1122extern const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[];
1123/* Other world's standard channel maps (C/LFE prior to RL/RR) */
1124extern const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[];
1125
1126/* bit masks to be passed to snd_pcm_chmap.channel_mask field */
1127#define SND_PCM_CHMAP_MASK_24   ((1U << 2) | (1U << 4))
1128#define SND_PCM_CHMAP_MASK_246  (SND_PCM_CHMAP_MASK_24 | (1U << 6))
1129#define SND_PCM_CHMAP_MASK_2468 (SND_PCM_CHMAP_MASK_246 | (1U << 8))
1130
1131int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
1132                           const struct snd_pcm_chmap_elem *chmap,
1133                           int max_channels,
1134                           unsigned long private_value,
1135                           struct snd_pcm_chmap **info_ret);
1136
1137/* Strong-typed conversion of pcm_format to bitwise */
1138static inline u64 pcm_format_to_bits(snd_pcm_format_t pcm_format)
1139{
1140        return 1ULL << (__force int) pcm_format;
1141}
1142
1143#endif /* __SOUND_PCM_H */
1144
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