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 (*copy)(struct snd_pcm_substream *substream, int channel,
  75                    snd_pcm_uframes_t pos,
  76                    void __user *buf, snd_pcm_uframes_t count);
  77        int (*silence)(struct snd_pcm_substream *substream, int channel, 
  78                       snd_pcm_uframes_t pos, snd_pcm_uframes_t count);
  79        struct page *(*page)(struct snd_pcm_substream *substream,
  80                             unsigned long offset);
  81        int (*mmap)(struct snd_pcm_substream *substream, struct vm_area_struct *vma);
  82        int (*ack)(struct snd_pcm_substream *substream);
  83};
  84
  85/*
  86 *
  87 */
  88
  89#if defined(CONFIG_SND_DYNAMIC_MINORS)
  90#define SNDRV_PCM_DEVICES       (SNDRV_OS_MINORS-2)
  91#else
  92#define SNDRV_PCM_DEVICES       8
  93#endif
  94
  95#define SNDRV_PCM_IOCTL1_FALSE          ((void *)0)
  96#define SNDRV_PCM_IOCTL1_TRUE           ((void *)1)
  97
  98#define SNDRV_PCM_IOCTL1_RESET          0
  99#define SNDRV_PCM_IOCTL1_INFO           1
 100#define SNDRV_PCM_IOCTL1_CHANNEL_INFO   2
 101#define SNDRV_PCM_IOCTL1_GSTATE         3
 102#define SNDRV_PCM_IOCTL1_FIFO_SIZE      4
 103
 104#define SNDRV_PCM_TRIGGER_STOP          0
 105#define SNDRV_PCM_TRIGGER_START         1
 106#define SNDRV_PCM_TRIGGER_PAUSE_PUSH    3
 107#define SNDRV_PCM_TRIGGER_PAUSE_RELEASE 4
 108#define SNDRV_PCM_TRIGGER_SUSPEND       5
 109#define SNDRV_PCM_TRIGGER_RESUME        6
 110
 111#define SNDRV_PCM_POS_XRUN              ((snd_pcm_uframes_t)-1)
 112
 113/* If you change this don't forget to change rates[] table in pcm_native.c */
 114#define SNDRV_PCM_RATE_5512             (1<<0)          /* 5512Hz */
 115#define SNDRV_PCM_RATE_8000             (1<<1)          /* 8000Hz */
 116#define SNDRV_PCM_RATE_11025            (1<<2)          /* 11025Hz */
 117#define SNDRV_PCM_RATE_16000            (1<<3)          /* 16000Hz */
 118#define SNDRV_PCM_RATE_22050            (1<<4)          /* 22050Hz */
 119#define SNDRV_PCM_RATE_32000            (1<<5)          /* 32000Hz */
 120#define SNDRV_PCM_RATE_44100            (1<<6)          /* 44100Hz */
 121#define SNDRV_PCM_RATE_48000            (1<<7)          /* 48000Hz */
 122#define SNDRV_PCM_RATE_64000            (1<<8)          /* 64000Hz */
 123#define SNDRV_PCM_RATE_88200            (1<<9)          /* 88200Hz */
 124#define SNDRV_PCM_RATE_96000            (1<<10)         /* 96000Hz */
 125#define SNDRV_PCM_RATE_176400           (1<<11)         /* 176400Hz */
 126#define SNDRV_PCM_RATE_192000           (1<<12)         /* 192000Hz */
 127
 128#define SNDRV_PCM_RATE_CONTINUOUS       (1<<30)         /* continuous range */
 129#define SNDRV_PCM_RATE_KNOT             (1<<31)         /* supports more non-continuos rates */
 130
 131#define SNDRV_PCM_RATE_8000_44100       (SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_11025|\
 132                                         SNDRV_PCM_RATE_16000|SNDRV_PCM_RATE_22050|\
 133                                         SNDRV_PCM_RATE_32000|SNDRV_PCM_RATE_44100)
 134#define SNDRV_PCM_RATE_8000_48000       (SNDRV_PCM_RATE_8000_44100|SNDRV_PCM_RATE_48000)
 135#define SNDRV_PCM_RATE_8000_96000       (SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_64000|\
 136                                         SNDRV_PCM_RATE_88200|SNDRV_PCM_RATE_96000)
 137#define SNDRV_PCM_RATE_8000_192000      (SNDRV_PCM_RATE_8000_96000|SNDRV_PCM_RATE_176400|\
 138                                         SNDRV_PCM_RATE_192000)
 139#define _SNDRV_PCM_FMTBIT(fmt)          (1ULL << (__force int)SNDRV_PCM_FORMAT_##fmt)
 140#define SNDRV_PCM_FMTBIT_S8             _SNDRV_PCM_FMTBIT(S8)
 141#define SNDRV_PCM_FMTBIT_U8             _SNDRV_PCM_FMTBIT(U8)
 142#define SNDRV_PCM_FMTBIT_S16_LE         _SNDRV_PCM_FMTBIT(S16_LE)
 143#define SNDRV_PCM_FMTBIT_S16_BE         _SNDRV_PCM_FMTBIT(S16_BE)
 144#define SNDRV_PCM_FMTBIT_U16_LE         _SNDRV_PCM_FMTBIT(U16_LE)
 145#define SNDRV_PCM_FMTBIT_U16_BE         _SNDRV_PCM_FMTBIT(U16_BE)
 146#define SNDRV_PCM_FMTBIT_S24_LE         _SNDRV_PCM_FMTBIT(S24_LE)
 147#define SNDRV_PCM_FMTBIT_S24_BE         _SNDRV_PCM_FMTBIT(S24_BE)
 148#define SNDRV_PCM_FMTBIT_U24_LE         _SNDRV_PCM_FMTBIT(U24_LE)
 149#define SNDRV_PCM_FMTBIT_U24_BE         _SNDRV_PCM_FMTBIT(U24_BE)
 150#define SNDRV_PCM_FMTBIT_S32_LE         _SNDRV_PCM_FMTBIT(S32_LE)
 151#define SNDRV_PCM_FMTBIT_S32_BE         _SNDRV_PCM_FMTBIT(S32_BE)
 152#define SNDRV_PCM_FMTBIT_U32_LE         _SNDRV_PCM_FMTBIT(U32_LE)
 153#define SNDRV_PCM_FMTBIT_U32_BE         _SNDRV_PCM_FMTBIT(U32_BE)
 154#define SNDRV_PCM_FMTBIT_FLOAT_LE       _SNDRV_PCM_FMTBIT(FLOAT_LE)
 155#define SNDRV_PCM_FMTBIT_FLOAT_BE       _SNDRV_PCM_FMTBIT(FLOAT_BE)
 156#define SNDRV_PCM_FMTBIT_FLOAT64_LE     _SNDRV_PCM_FMTBIT(FLOAT64_LE)
 157#define SNDRV_PCM_FMTBIT_FLOAT64_BE     _SNDRV_PCM_FMTBIT(FLOAT64_BE)
 158#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_LE)
 159#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_BE)
 160#define SNDRV_PCM_FMTBIT_MU_LAW         _SNDRV_PCM_FMTBIT(MU_LAW)
 161#define SNDRV_PCM_FMTBIT_A_LAW          _SNDRV_PCM_FMTBIT(A_LAW)
 162#define SNDRV_PCM_FMTBIT_IMA_ADPCM      _SNDRV_PCM_FMTBIT(IMA_ADPCM)
 163#define SNDRV_PCM_FMTBIT_MPEG           _SNDRV_PCM_FMTBIT(MPEG)
 164#define SNDRV_PCM_FMTBIT_GSM            _SNDRV_PCM_FMTBIT(GSM)
 165#define SNDRV_PCM_FMTBIT_SPECIAL        _SNDRV_PCM_FMTBIT(SPECIAL)
 166#define SNDRV_PCM_FMTBIT_S24_3LE        _SNDRV_PCM_FMTBIT(S24_3LE)
 167#define SNDRV_PCM_FMTBIT_U24_3LE        _SNDRV_PCM_FMTBIT(U24_3LE)
 168#define SNDRV_PCM_FMTBIT_S24_3BE        _SNDRV_PCM_FMTBIT(S24_3BE)
 169#define SNDRV_PCM_FMTBIT_U24_3BE        _SNDRV_PCM_FMTBIT(U24_3BE)
 170#define SNDRV_PCM_FMTBIT_S20_3LE        _SNDRV_PCM_FMTBIT(S20_3LE)
 171#define SNDRV_PCM_FMTBIT_U20_3LE        _SNDRV_PCM_FMTBIT(U20_3LE)
 172#define SNDRV_PCM_FMTBIT_S20_3BE        _SNDRV_PCM_FMTBIT(S20_3BE)
 173#define SNDRV_PCM_FMTBIT_U20_3BE        _SNDRV_PCM_FMTBIT(U20_3BE)
 174#define SNDRV_PCM_FMTBIT_S18_3LE        _SNDRV_PCM_FMTBIT(S18_3LE)
 175#define SNDRV_PCM_FMTBIT_U18_3LE        _SNDRV_PCM_FMTBIT(U18_3LE)
 176#define SNDRV_PCM_FMTBIT_S18_3BE        _SNDRV_PCM_FMTBIT(S18_3BE)
 177#define SNDRV_PCM_FMTBIT_U18_3BE        _SNDRV_PCM_FMTBIT(U18_3BE)
 178#define SNDRV_PCM_FMTBIT_G723_24        _SNDRV_PCM_FMTBIT(G723_24)
 179#define SNDRV_PCM_FMTBIT_G723_24_1B     _SNDRV_PCM_FMTBIT(G723_24_1B)
 180#define SNDRV_PCM_FMTBIT_G723_40        _SNDRV_PCM_FMTBIT(G723_40)
 181#define SNDRV_PCM_FMTBIT_G723_40_1B     _SNDRV_PCM_FMTBIT(G723_40_1B)
 182
 183#ifdef SNDRV_LITTLE_ENDIAN
 184#define SNDRV_PCM_FMTBIT_S16            SNDRV_PCM_FMTBIT_S16_LE
 185#define SNDRV_PCM_FMTBIT_U16            SNDRV_PCM_FMTBIT_U16_LE
 186#define SNDRV_PCM_FMTBIT_S24            SNDRV_PCM_FMTBIT_S24_LE
 187#define SNDRV_PCM_FMTBIT_U24            SNDRV_PCM_FMTBIT_U24_LE
 188#define SNDRV_PCM_FMTBIT_S32            SNDRV_PCM_FMTBIT_S32_LE
 189#define SNDRV_PCM_FMTBIT_U32            SNDRV_PCM_FMTBIT_U32_LE
 190#define SNDRV_PCM_FMTBIT_FLOAT          SNDRV_PCM_FMTBIT_FLOAT_LE
 191#define SNDRV_PCM_FMTBIT_FLOAT64        SNDRV_PCM_FMTBIT_FLOAT64_LE
 192#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE
 193#endif
 194#ifdef SNDRV_BIG_ENDIAN
 195#define SNDRV_PCM_FMTBIT_S16            SNDRV_PCM_FMTBIT_S16_BE
 196#define SNDRV_PCM_FMTBIT_U16            SNDRV_PCM_FMTBIT_U16_BE
 197#define SNDRV_PCM_FMTBIT_S24            SNDRV_PCM_FMTBIT_S24_BE
 198#define SNDRV_PCM_FMTBIT_U24            SNDRV_PCM_FMTBIT_U24_BE
 199#define SNDRV_PCM_FMTBIT_S32            SNDRV_PCM_FMTBIT_S32_BE
 200#define SNDRV_PCM_FMTBIT_U32            SNDRV_PCM_FMTBIT_U32_BE
 201#define SNDRV_PCM_FMTBIT_FLOAT          SNDRV_PCM_FMTBIT_FLOAT_BE
 202#define SNDRV_PCM_FMTBIT_FLOAT64        SNDRV_PCM_FMTBIT_FLOAT64_BE
 203#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE
 204#endif
 205
 206struct snd_pcm_file {
 207        struct snd_pcm_substream *substream;
 208        int no_compat_mmap;
 209};
 210
 211struct snd_pcm_hw_rule;
 212typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params,
 213                                      struct snd_pcm_hw_rule *rule);
 214
 215struct snd_pcm_hw_rule {
 216        unsigned int cond;
 217        snd_pcm_hw_rule_func_t func;
 218        int var;
 219        int deps[4];
 220        void *private;
 221};
 222
 223struct snd_pcm_hw_constraints {
 224        struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK - 
 225                         SNDRV_PCM_HW_PARAM_FIRST_MASK + 1];
 226        struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL -
 227                             SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
 228        unsigned int rules_num;
 229        unsigned int rules_all;
 230        struct snd_pcm_hw_rule *rules;
 231};
 232
 233static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs,
 234                                            snd_pcm_hw_param_t var)
 235{
 236        return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 237}
 238
 239static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs,
 240                                                    snd_pcm_hw_param_t var)
 241{
 242        return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 243}
 244
 245struct snd_ratnum {
 246        unsigned int num;
 247        unsigned int den_min, den_max, den_step;
 248};
 249
 250struct snd_ratden {
 251        unsigned int num_min, num_max, num_step;
 252        unsigned int den;
 253};
 254
 255struct snd_pcm_hw_constraint_ratnums {
 256        int nrats;
 257        struct snd_ratnum *rats;
 258};
 259
 260struct snd_pcm_hw_constraint_ratdens {
 261        int nrats;
 262        struct snd_ratden *rats;
 263};
 264
 265struct snd_pcm_hw_constraint_list {
 266        unsigned int count;
 267        const unsigned int *list;
 268        unsigned int mask;
 269};
 270
 271struct snd_pcm_hwptr_log;
 272
 273struct snd_pcm_runtime {
 274        /* -- Status -- */
 275        struct snd_pcm_substream *trigger_master;
 276        struct timespec trigger_tstamp; /* trigger timestamp */
 277        int overrange;
 278        snd_pcm_uframes_t avail_max;
 279        snd_pcm_uframes_t hw_ptr_base;  /* Position at buffer restart */
 280        snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time */
 281        unsigned long hw_ptr_jiffies;   /* Time when hw_ptr is updated */
 282        unsigned long hw_ptr_buffer_jiffies; /* buffer time in jiffies */
 283        snd_pcm_sframes_t delay;        /* extra delay; typically FIFO size */
 284
 285        /* -- HW params -- */
 286        snd_pcm_access_t access;        /* access mode */
 287        snd_pcm_format_t format;        /* SNDRV_PCM_FORMAT_* */
 288        snd_pcm_subformat_t subformat;  /* subformat */
 289        unsigned int rate;              /* rate in Hz */
 290        unsigned int channels;          /* channels */
 291        snd_pcm_uframes_t period_size;  /* period size */
 292        unsigned int periods;           /* periods */
 293        snd_pcm_uframes_t buffer_size;  /* buffer size */
 294        snd_pcm_uframes_t min_align;    /* Min alignment for the format */
 295        size_t byte_align;
 296        unsigned int frame_bits;
 297        unsigned int sample_bits;
 298        unsigned int info;
 299        unsigned int rate_num;
 300        unsigned int rate_den;
 301        unsigned int no_period_wakeup: 1;
 302
 303        /* -- SW params -- */
 304        int tstamp_mode;                /* mmap timestamp is updated */
 305        unsigned int period_step;
 306        snd_pcm_uframes_t start_threshold;
 307        snd_pcm_uframes_t stop_threshold;
 308        snd_pcm_uframes_t silence_threshold; /* Silence filling happens when
 309                                                noise is nearest than this */
 310        snd_pcm_uframes_t silence_size; /* Silence filling size */
 311        snd_pcm_uframes_t boundary;     /* pointers wrap point */
 312
 313        snd_pcm_uframes_t silence_start; /* starting pointer to silence area */
 314        snd_pcm_uframes_t silence_filled; /* size filled with silence */
 315
 316        union snd_pcm_sync_id sync;     /* hardware synchronization ID */
 317
 318        /* -- mmap -- */
 319        struct snd_pcm_mmap_status *status;
 320        struct snd_pcm_mmap_control *control;
 321
 322        /* -- locking / scheduling -- */
 323        snd_pcm_uframes_t twake;        /* do transfer (!poll) wakeup if non-zero */
 324        wait_queue_head_t sleep;        /* poll sleep */
 325        wait_queue_head_t tsleep;       /* transfer sleep */
 326        struct fasync_struct *fasync;
 327
 328        /* -- private section -- */
 329        void *private_data;
 330        void (*private_free)(struct snd_pcm_runtime *runtime);
 331
 332        /* -- hardware description -- */
 333        struct snd_pcm_hardware hw;
 334        struct snd_pcm_hw_constraints hw_constraints;
 335
 336        /* -- interrupt callbacks -- */
 337        void (*transfer_ack_begin)(struct snd_pcm_substream *substream);
 338        void (*transfer_ack_end)(struct snd_pcm_substream *substream);
 339
 340        /* -- timer -- */
 341        unsigned int timer_resolution;  /* timer resolution */
 342        int tstamp_type;                /* timestamp type */
 343
 344        /* -- DMA -- */           
 345        unsigned char *dma_area;        /* DMA area */
 346        dma_addr_t dma_addr;            /* physical bus address (not accessible from main CPU) */
 347        size_t dma_bytes;               /* size of DMA area */
 348
 349        struct snd_dma_buffer *dma_buffer_p;    /* allocated buffer */
 350
 351#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 352        /* -- OSS things -- */
 353        struct snd_pcm_oss_runtime oss;
 354#endif
 355
 356#ifdef CONFIG_SND_PCM_XRUN_DEBUG
 357        struct snd_pcm_hwptr_log *hwptr_log;
 358#endif
 359};
 360
 361struct snd_pcm_group {          /* keep linked substreams */
 362        spinlock_t lock;
 363        struct list_head substreams;
 364        int count;
 365};
 366
 367struct pid;
 368
 369struct snd_pcm_substream {
 370        struct snd_pcm *pcm;
 371        struct snd_pcm_str *pstr;
 372        void *private_data;             /* copied from pcm->private_data */
 373        int number;
 374        char name[32];                  /* substream name */
 375        int stream;                     /* stream (direction) */
 376        struct pm_qos_request latency_pm_qos_req; /* pm_qos request */
 377        size_t buffer_bytes_max;        /* limit ring buffer size */
 378        struct snd_dma_buffer dma_buffer;
 379        unsigned int dma_buf_id;
 380        size_t dma_max;
 381        /* -- hardware operations -- */
 382        struct snd_pcm_ops *ops;
 383        /* -- runtime information -- */
 384        struct snd_pcm_runtime *runtime;
 385        /* -- timer section -- */
 386        struct snd_timer *timer;                /* timer */
 387        unsigned timer_running: 1;      /* time is running */
 388        /* -- next substream -- */
 389        struct snd_pcm_substream *next;
 390        /* -- linked substreams -- */
 391        struct list_head link_list;     /* linked list member */
 392        struct snd_pcm_group self_group;        /* fake group for non linked substream (with substream lock inside) */
 393        struct snd_pcm_group *group;            /* pointer to current group */
 394        /* -- assigned files -- */
 395        void *file;
 396        int ref_count;
 397        atomic_t mmap_count;
 398        unsigned int f_flags;
 399        void (*pcm_release)(struct snd_pcm_substream *);
 400        struct pid *pid;
 401#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 402        /* -- OSS things -- */
 403        struct snd_pcm_oss_substream oss;
 404#endif
 405#ifdef CONFIG_SND_VERBOSE_PROCFS
 406        struct snd_info_entry *proc_root;
 407        struct snd_info_entry *proc_info_entry;
 408        struct snd_info_entry *proc_hw_params_entry;
 409        struct snd_info_entry *proc_sw_params_entry;
 410        struct snd_info_entry *proc_status_entry;
 411        struct snd_info_entry *proc_prealloc_entry;
 412        struct snd_info_entry *proc_prealloc_max_entry;
 413#endif
 414        /* misc flags */
 415        unsigned int hw_opened: 1;
 416};
 417
 418#define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0)
 419
 420
 421struct snd_pcm_str {
 422        int stream;                             /* stream (direction) */
 423        struct snd_pcm *pcm;
 424        /* -- substreams -- */
 425        unsigned int substream_count;
 426        unsigned int substream_opened;
 427        struct snd_pcm_substream *substream;
 428#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 429        /* -- OSS things -- */
 430        struct snd_pcm_oss_stream oss;
 431#endif
 432#ifdef CONFIG_SND_VERBOSE_PROCFS
 433        struct snd_info_entry *proc_root;
 434        struct snd_info_entry *proc_info_entry;
 435#ifdef CONFIG_SND_PCM_XRUN_DEBUG
 436        unsigned int xrun_debug;        /* 0 = disabled, 1 = verbose, 2 = stacktrace */
 437        struct snd_info_entry *proc_xrun_debug_entry;
 438#endif
 439#endif
 440        struct snd_kcontrol *chmap_kctl; /* channel-mapping controls */
 441};
 442
 443struct snd_pcm {
 444        struct snd_card *card;
 445        struct list_head list;
 446        int device; /* device number */
 447        unsigned int info_flags;
 448        unsigned short dev_class;
 449        unsigned short dev_subclass;
 450        char id[64];
 451        char name[80];
 452        struct snd_pcm_str streams[2];
 453        struct mutex open_mutex;
 454        wait_queue_head_t open_wait;
 455        void *private_data;
 456        void (*private_free) (struct snd_pcm *pcm);
 457        struct device *dev; /* actual hw device this belongs to */
 458        bool internal; /* pcm is for internal use only */
 459#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 460        struct snd_pcm_oss oss;
 461#endif
 462};
 463
 464struct snd_pcm_notify {
 465        int (*n_register) (struct snd_pcm * pcm);
 466        int (*n_disconnect) (struct snd_pcm * pcm);
 467        int (*n_unregister) (struct snd_pcm * pcm);
 468        struct list_head list;
 469};
 470
 471/*
 472 *  Registering
 473 */
 474
 475extern const struct file_operations snd_pcm_f_ops[2];
 476
 477int snd_pcm_new(struct snd_card *card, const char *id, int device,
 478                int playback_count, int capture_count,
 479                struct snd_pcm **rpcm);
 480int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
 481                int playback_count, int capture_count,
 482                struct snd_pcm **rpcm);
 483int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
 484
 485int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
 486
 487/*
 488 *  Native I/O
 489 */
 490
 491extern rwlock_t snd_pcm_link_rwlock;
 492
 493int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
 494int snd_pcm_info_user(struct snd_pcm_substream *substream,
 495                      struct snd_pcm_info __user *info);
 496int snd_pcm_status(struct snd_pcm_substream *substream,
 497                   struct snd_pcm_status *status);
 498int snd_pcm_start(struct snd_pcm_substream *substream);
 499int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t status);
 500int snd_pcm_drain_done(struct snd_pcm_substream *substream);
 501#ifdef CONFIG_PM
 502int snd_pcm_suspend(struct snd_pcm_substream *substream);
 503int snd_pcm_suspend_all(struct snd_pcm *pcm);
 504#endif
 505int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
 506int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
 507                           struct snd_pcm_substream **rsubstream);
 508void snd_pcm_release_substream(struct snd_pcm_substream *substream);
 509int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
 510                             struct snd_pcm_substream **rsubstream);
 511void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
 512void snd_pcm_vma_notify_data(void *client, void *data);
 513int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
 514
 515
 516#ifdef CONFIG_SND_DEBUG
 517void snd_pcm_debug_name(struct snd_pcm_substream *substream,
 518                           char *name, size_t len);
 519#else
 520static inline void
 521snd_pcm_debug_name(struct snd_pcm_substream *substream, char *buf, size_t size)
 522{
 523        *buf = 0;
 524}
 525#endif
 526
 527/*
 528 *  PCM library
 529 */
 530
 531static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
 532{
 533        return substream->group != &substream->self_group;
 534}
 535
 536static inline void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
 537{
 538        read_lock(&snd_pcm_link_rwlock);
 539        spin_lock(&substream->self_group.lock);
 540}
 541
 542static inline void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
 543{
 544        spin_unlock(&substream->self_group.lock);
 545        read_unlock(&snd_pcm_link_rwlock);
 546}
 547
 548static inline void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
 549{
 550        read_lock_irq(&snd_pcm_link_rwlock);
 551        spin_lock(&substream->self_group.lock);
 552}
 553
 554static inline void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
 555{
 556        spin_unlock(&substream->self_group.lock);
 557        read_unlock_irq(&snd_pcm_link_rwlock);
 558}
 559
 560#define snd_pcm_stream_lock_irqsave(substream, flags) \
 561do { \
 562        read_lock_irqsave(&snd_pcm_link_rwlock, (flags)); \
 563        spin_lock(&substream->self_group.lock); \
 564} while (0)
 565
 566#define snd_pcm_stream_unlock_irqrestore(substream, flags) \
 567do { \
 568        spin_unlock(&substream->self_group.lock); \
 569        read_unlock_irqrestore(&snd_pcm_link_rwlock, (flags)); \
 570} while (0)
 571
 572#define snd_pcm_group_for_each_entry(s, substream) \
 573        list_for_each_entry(s, &substream->group->substreams, link_list)
 574
 575static inline int snd_pcm_running(struct snd_pcm_substream *substream)
 576{
 577        return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 578                (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
 579                 substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
 580}
 581
 582static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
 583{
 584        return size * 8 / runtime->sample_bits;
 585}
 586
 587static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
 588{
 589        return size * 8 / runtime->frame_bits;
 590}
 591
 592static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
 593{
 594        return size * runtime->sample_bits / 8;
 595}
 596
 597static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
 598{
 599        return size * runtime->frame_bits / 8;
 600}
 601
 602static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
 603{
 604        return bytes % runtime->byte_align == 0;
 605}
 606
 607static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
 608{
 609        struct snd_pcm_runtime *runtime = substream->runtime;
 610        return frames_to_bytes(runtime, runtime->buffer_size);
 611}
 612
 613static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
 614{
 615        struct snd_pcm_runtime *runtime = substream->runtime;
 616        return frames_to_bytes(runtime, runtime->period_size);
 617}
 618
 619/*
 620 *  result is: 0 ... (boundary - 1)
 621 */
 622static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
 623{
 624        snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
 625        if (avail < 0)
 626                avail += runtime->boundary;
 627        else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
 628                avail -= runtime->boundary;
 629        return avail;
 630}
 631
 632/*
 633 *  result is: 0 ... (boundary - 1)
 634 */
 635static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
 636{
 637        snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
 638        if (avail < 0)
 639                avail += runtime->boundary;
 640        return avail;
 641}
 642
 643static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
 644{
 645        return runtime->buffer_size - snd_pcm_playback_avail(runtime);
 646}
 647
 648static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
 649{
 650        return runtime->buffer_size - snd_pcm_capture_avail(runtime);
 651}
 652
 653/**
 654 * snd_pcm_playback_ready - check whether the playback buffer is available
 655 * @substream: the pcm substream instance
 656 *
 657 * Checks whether enough free space is available on the playback buffer.
 658 *
 659 * Returns non-zero if available, or zero if not.
 660 */
 661static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
 662{
 663        struct snd_pcm_runtime *runtime = substream->runtime;
 664        return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
 665}
 666
 667/**
 668 * snd_pcm_capture_ready - check whether the capture buffer is available
 669 * @substream: the pcm substream instance
 670 *
 671 * Checks whether enough capture data is available on the capture buffer.
 672 *
 673 * Returns non-zero if available, or zero if not.
 674 */
 675static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
 676{
 677        struct snd_pcm_runtime *runtime = substream->runtime;
 678        return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
 679}
 680
 681/**
 682 * snd_pcm_playback_data - check whether any data exists on the playback buffer
 683 * @substream: the pcm substream instance
 684 *
 685 * Checks whether any data exists on the playback buffer. If stop_threshold
 686 * is bigger or equal to boundary, then this function returns always non-zero.
 687 *
 688 * Returns non-zero if exists, or zero if not.
 689 */
 690static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
 691{
 692        struct snd_pcm_runtime *runtime = substream->runtime;
 693        
 694        if (runtime->stop_threshold >= runtime->boundary)
 695                return 1;
 696        return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
 697}
 698
 699/**
 700 * snd_pcm_playback_empty - check whether the playback buffer is empty
 701 * @substream: the pcm substream instance
 702 *
 703 * Checks whether the playback buffer is empty.
 704 *
 705 * Returns non-zero if empty, or zero if not.
 706 */
 707static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
 708{
 709        struct snd_pcm_runtime *runtime = substream->runtime;
 710        return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
 711}
 712
 713/**
 714 * snd_pcm_capture_empty - check whether the capture buffer is empty
 715 * @substream: the pcm substream instance
 716 *
 717 * Checks whether the capture buffer is empty.
 718 *
 719 * Returns non-zero if empty, or zero if not.
 720 */
 721static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
 722{
 723        struct snd_pcm_runtime *runtime = substream->runtime;
 724        return snd_pcm_capture_avail(runtime) == 0;
 725}
 726
 727static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream, 
 728                                        struct snd_pcm_substream *master)
 729{
 730        substream->runtime->trigger_master = master;
 731}
 732
 733static inline int hw_is_mask(int var)
 734{
 735        return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
 736                var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
 737}
 738
 739static inline int hw_is_interval(int var)
 740{
 741        return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
 742                var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
 743}
 744
 745static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
 746                                     snd_pcm_hw_param_t var)
 747{
 748        return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 749}
 750
 751static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
 752                                             snd_pcm_hw_param_t var)
 753{
 754        return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 755}
 756
 757static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
 758                                             snd_pcm_hw_param_t var)
 759{
 760        return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 761}
 762
 763static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
 764                                                     snd_pcm_hw_param_t var)
 765{
 766        return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 767}
 768
 769#define params_channels(p) \
 770        (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_CHANNELS)->min)
 771#define params_rate(p) \
 772        (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_RATE)->min)
 773#define params_period_size(p) \
 774        (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min)
 775#define params_periods(p) \
 776        (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_PERIODS)->min)
 777#define params_buffer_size(p) \
 778        (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min)
 779#define params_buffer_bytes(p) \
 780        (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min)
 781
 782int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
 783void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
 784void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
 785void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b, 
 786                          unsigned int k, struct snd_interval *c);
 787void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
 788                          const struct snd_interval *b, struct snd_interval *c);
 789int snd_interval_list(struct snd_interval *i, unsigned int count,
 790                      const unsigned int *list, unsigned int mask);
 791int snd_interval_ratnum(struct snd_interval *i,
 792                        unsigned int rats_count, struct snd_ratnum *rats,
 793                        unsigned int *nump, unsigned int *denp);
 794
 795void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
 796void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
 797int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
 798
 799int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
 800
 801int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream);
 802int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream);
 803
 804int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 805                               u_int32_t mask);
 806int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 807                                 u_int64_t mask);
 808int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 809                                 unsigned int min, unsigned int max);
 810int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
 811int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime, 
 812                               unsigned int cond,
 813                               snd_pcm_hw_param_t var,
 814                               const struct snd_pcm_hw_constraint_list *l);
 815int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime, 
 816                                  unsigned int cond,
 817                                  snd_pcm_hw_param_t var,
 818                                  struct snd_pcm_hw_constraint_ratnums *r);
 819int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime, 
 820                                  unsigned int cond,
 821                                  snd_pcm_hw_param_t var,
 822                                  struct snd_pcm_hw_constraint_ratdens *r);
 823int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime, 
 824                                 unsigned int cond,
 825                                 unsigned int width,
 826                                 unsigned int msbits);
 827int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
 828                               unsigned int cond,
 829                               snd_pcm_hw_param_t var,
 830                               unsigned long step);
 831int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
 832                               unsigned int cond,
 833                               snd_pcm_hw_param_t var);
 834int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
 835                               unsigned int base_rate);
 836int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
 837                        unsigned int cond,
 838                        int var,
 839                        snd_pcm_hw_rule_func_t func, void *private,
 840                        int dep, ...);
 841
 842int snd_pcm_format_signed(snd_pcm_format_t format);
 843int snd_pcm_format_unsigned(snd_pcm_format_t format);
 844int snd_pcm_format_linear(snd_pcm_format_t format);
 845int snd_pcm_format_little_endian(snd_pcm_format_t format);
 846int snd_pcm_format_big_endian(snd_pcm_format_t format);
 847#if 0 /* just for DocBook */
 848/**
 849 * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
 850 * @format: the format to check
 851 *
 852 * Returns 1 if the given PCM format is CPU-endian, 0 if
 853 * opposite, or a negative error code if endian not specified.
 854 */
 855int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
 856#endif /* DocBook */
 857#ifdef SNDRV_LITTLE_ENDIAN
 858#define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
 859#else
 860#define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
 861#endif
 862int snd_pcm_format_width(snd_pcm_format_t format);                      /* in bits */
 863int snd_pcm_format_physical_width(snd_pcm_format_t format);             /* in bits */
 864ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
 865const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
 866int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
 867snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsignd, int big_endian);
 868
 869void snd_pcm_set_ops(struct snd_pcm * pcm, int direction, struct snd_pcm_ops *ops);
 870void snd_pcm_set_sync(struct snd_pcm_substream *substream);
 871int snd_pcm_lib_interleave_len(struct snd_pcm_substream *substream);
 872int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
 873                      unsigned int cmd, void *arg);                      
 874int snd_pcm_update_state(struct snd_pcm_substream *substream,
 875                         struct snd_pcm_runtime *runtime);
 876int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream);
 877int snd_pcm_playback_xrun_check(struct snd_pcm_substream *substream);
 878int snd_pcm_capture_xrun_check(struct snd_pcm_substream *substream);
 879int snd_pcm_playback_xrun_asap(struct snd_pcm_substream *substream);
 880int snd_pcm_capture_xrun_asap(struct snd_pcm_substream *substream);
 881void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr);
 882void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
 883snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream,
 884                                    const void __user *buf,
 885                                    snd_pcm_uframes_t frames);
 886snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream,
 887                                   void __user *buf, snd_pcm_uframes_t frames);
 888snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
 889                                     void __user **bufs, snd_pcm_uframes_t frames);
 890snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
 891                                    void __user **bufs, snd_pcm_uframes_t frames);
 892
 893extern const struct snd_pcm_hw_constraint_list snd_pcm_known_rates;
 894
 895int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime);
 896unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate);
 897unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit);
 898
 899static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
 900                                              struct snd_dma_buffer *bufp)
 901{
 902        struct snd_pcm_runtime *runtime = substream->runtime;
 903        if (bufp) {
 904                runtime->dma_buffer_p = bufp;
 905                runtime->dma_area = bufp->area;
 906                runtime->dma_addr = bufp->addr;
 907                runtime->dma_bytes = bufp->bytes;
 908        } else {
 909                runtime->dma_buffer_p = NULL;
 910                runtime->dma_area = NULL;
 911                runtime->dma_addr = 0;
 912                runtime->dma_bytes = 0;
 913        }
 914}
 915
 916/*
 917 *  Timer interface
 918 */
 919
 920void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream);
 921void snd_pcm_timer_init(struct snd_pcm_substream *substream);
 922void snd_pcm_timer_done(struct snd_pcm_substream *substream);
 923
 924static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime,
 925                                   struct timespec *tv)
 926{
 927        if (runtime->tstamp_type == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
 928                do_posix_clock_monotonic_gettime(tv);
 929        else
 930                getnstimeofday(tv);
 931}
 932
 933/*
 934 *  Memory
 935 */
 936
 937int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
 938int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
 939int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
 940                                  int type, struct device *data,
 941                                  size_t size, size_t max);
 942int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
 943                                          int type, void *data,
 944                                          size_t size, size_t max);
 945int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
 946int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
 947
 948int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream,
 949                                      size_t size, gfp_t gfp_flags);
 950int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream);
 951struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream,
 952                                          unsigned long offset);
 953#if 0 /* for kernel-doc */
 954/**
 955 * snd_pcm_lib_alloc_vmalloc_buffer - allocate virtual DMA buffer
 956 * @substream: the substream to allocate the buffer to
 957 * @size: the requested buffer size, in bytes
 958 *
 959 * Allocates the PCM substream buffer using vmalloc(), i.e., the memory is
 960 * contiguous in kernel virtual space, but not in physical memory.  Use this
 961 * if the buffer is accessed by kernel code but not by device DMA.
 962 *
 963 * Returns 1 if the buffer was changed, 0 if not changed, or a negative error
 964 * code.
 965 */
 966static int snd_pcm_lib_alloc_vmalloc_buffer
 967                        (struct snd_pcm_substream *substream, size_t size);
 968/**
 969 * snd_pcm_lib_alloc_vmalloc_32_buffer - allocate 32-bit-addressable buffer
 970 * @substream: the substream to allocate the buffer to
 971 * @size: the requested buffer size, in bytes
 972 *
 973 * This function works like snd_pcm_lib_alloc_vmalloc_buffer(), but uses
 974 * vmalloc_32(), i.e., the pages are allocated from 32-bit-addressable memory.
 975 */
 976static int snd_pcm_lib_alloc_vmalloc_32_buffer
 977                        (struct snd_pcm_substream *substream, size_t size);
 978#endif
 979#define snd_pcm_lib_alloc_vmalloc_buffer(subs, size) \
 980        _snd_pcm_lib_alloc_vmalloc_buffer \
 981                        (subs, size, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO)
 982#define snd_pcm_lib_alloc_vmalloc_32_buffer(subs, size) \
 983        _snd_pcm_lib_alloc_vmalloc_buffer \
 984                        (subs, size, GFP_KERNEL | GFP_DMA32 | __GFP_ZERO)
 985
 986#define snd_pcm_get_dma_buf(substream) ((substream)->runtime->dma_buffer_p)
 987
 988#ifdef CONFIG_SND_DMA_SGBUF
 989/*
 990 * SG-buffer handling
 991 */
 992#define snd_pcm_substream_sgbuf(substream) \
 993        snd_pcm_get_dma_buf(substream)->private_data
 994
 995struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream,
 996                                    unsigned long offset);
 997#else /* !SND_DMA_SGBUF */
 998/*
 999 * fake using a continuous buffer
1000 */
1001#define snd_pcm_sgbuf_ops_page  NULL
1002#endif /* SND_DMA_SGBUF */
1003
1004static inline dma_addr_t
1005snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
1006{
1007        return snd_sgbuf_get_addr(snd_pcm_get_dma_buf(substream), ofs);
1008}
1009
1010static inline void *
1011snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
1012{
1013        return snd_sgbuf_get_ptr(snd_pcm_get_dma_buf(substream), ofs);
1014}
1015
1016static inline unsigned int
1017snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
1018                             unsigned int ofs, unsigned int size)
1019{
1020        return snd_sgbuf_get_chunk_size(snd_pcm_get_dma_buf(substream), ofs, size);
1021}
1022
1023/* handle mmap counter - PCM mmap callback should handle this counter properly */
1024static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
1025{
1026        struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1027        atomic_inc(&substream->mmap_count);
1028}
1029
1030static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
1031{
1032        struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1033        atomic_dec(&substream->mmap_count);
1034}
1035
1036int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
1037                             struct vm_area_struct *area);
1038/* mmap for io-memory area */
1039#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
1040#define SNDRV_PCM_INFO_MMAP_IOMEM       SNDRV_PCM_INFO_MMAP
1041int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
1042#else
1043#define SNDRV_PCM_INFO_MMAP_IOMEM       0
1044#define snd_pcm_lib_mmap_iomem  NULL
1045#endif
1046
1047#define snd_pcm_lib_mmap_vmalloc NULL
1048
1049static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
1050{
1051        *max = dma < 4 ? 64 * 1024 : 128 * 1024;
1052}
1053
1054/*
1055 *  Misc
1056 */
1057
1058#define SNDRV_PCM_DEFAULT_CON_SPDIF     (IEC958_AES0_CON_EMPHASIS_NONE|\
1059                                         (IEC958_AES1_CON_ORIGINAL<<8)|\
1060                                         (IEC958_AES1_CON_PCM_CODER<<8)|\
1061                                         (IEC958_AES3_CON_FS_48000<<24))
1062
1063#define PCM_RUNTIME_CHECK(sub) snd_BUG_ON(!(sub) || !(sub)->runtime)
1064
1065const char *snd_pcm_format_name(snd_pcm_format_t format);
1066
1067/**
1068 * snd_pcm_stream_str - Get a string naming the direction of a stream
1069 * @substream: the pcm substream instance
1070 */
1071static inline const char *snd_pcm_stream_str(struct snd_pcm_substream *substream)
1072{
1073        if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1074                return "Playback";
1075        else
1076                return "Capture";
1077}
1078
1079/*
1080 * PCM channel-mapping control API
1081 */
1082/* array element of channel maps */
1083struct snd_pcm_chmap_elem {
1084        unsigned char channels;
1085        unsigned char map[15];
1086};
1087
1088/* channel map information; retrieved via snd_kcontrol_chip() */
1089struct snd_pcm_chmap {
1090        struct snd_pcm *pcm;    /* assigned PCM instance */
1091        int stream;             /* PLAYBACK or CAPTURE */
1092        struct snd_kcontrol *kctl;
1093        const struct snd_pcm_chmap_elem *chmap;
1094        unsigned int max_channels;
1095        unsigned int channel_mask;      /* optional: active channels bitmask */
1096        void *private_data;     /* optional: private data pointer */
1097};
1098
1099/* get the PCM substream assigned to the given chmap info */
1100static inline struct snd_pcm_substream *
1101snd_pcm_chmap_substream(struct snd_pcm_chmap *info, unsigned int idx)
1102{
1103        struct snd_pcm_substream *s;
1104        for (s = info->pcm->streams[info->stream].substream; s; s = s->next)
1105                if (s->number == idx)
1106                        return s;
1107        return NULL;
1108}
1109
1110/* ALSA-standard channel maps (RL/RR prior to C/LFE) */
1111extern const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[];
1112/* Other world's standard channel maps (C/LFE prior to RL/RR) */
1113extern const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[];
1114
1115/* bit masks to be passed to snd_pcm_chmap.channel_mask field */
1116#define SND_PCM_CHMAP_MASK_24   ((1U << 2) | (1U << 4))
1117#define SND_PCM_CHMAP_MASK_246  (SND_PCM_CHMAP_MASK_24 | (1U << 6))
1118#define SND_PCM_CHMAP_MASK_2468 (SND_PCM_CHMAP_MASK_246 | (1U << 8))
1119
1120int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
1121                           const struct snd_pcm_chmap_elem *chmap,
1122                           int max_channels,
1123                           unsigned long private_value,
1124                           struct snd_pcm_chmap **info_ret);
1125
1126#endif /* __SOUND_PCM_H */
1127
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