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
  33#define snd_pcm_substream_chip(substream) ((substream)->private_data)
  34#define snd_pcm_chip(pcm) ((pcm)->private_data)
  35
  36#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
  37#include "pcm_oss.h"
  38#endif
  39
  40/*
  41 *  Hardware (lowlevel) section
  42 */
  43
  44struct snd_pcm_hardware {
  45        unsigned int info;              /* SNDRV_PCM_INFO_* */
  46        u64 formats;                    /* SNDRV_PCM_FMTBIT_* */
  47        unsigned int rates;             /* SNDRV_PCM_RATE_* */
  48        unsigned int rate_min;          /* min rate */
  49        unsigned int rate_max;          /* max rate */
  50        unsigned int channels_min;      /* min channels */
  51        unsigned int channels_max;      /* max channels */
  52        size_t buffer_bytes_max;        /* max buffer size */
  53        size_t period_bytes_min;        /* min period size */
  54        size_t period_bytes_max;        /* max period size */
  55        unsigned int periods_min;       /* min # of periods */
  56        unsigned int periods_max;       /* max # of periods */
  57        size_t fifo_size;               /* fifo size in bytes */
  58};
  59
  60struct snd_pcm_substream;
  61
  62struct snd_pcm_ops {
  63        int (*open)(struct snd_pcm_substream *substream);
  64        int (*close)(struct snd_pcm_substream *substream);
  65        int (*ioctl)(struct snd_pcm_substream * substream,
  66                     unsigned int cmd, void *arg);
  67        int (*hw_params)(struct snd_pcm_substream *substream,
  68                         struct snd_pcm_hw_params *params);
  69        int (*hw_free)(struct snd_pcm_substream *substream);
  70        int (*prepare)(struct snd_pcm_substream *substream);
  71        int (*trigger)(struct snd_pcm_substream *substream, int cmd);
  72        snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *substream);
  73        int (*copy)(struct snd_pcm_substream *substream, int channel,
  74                    snd_pcm_uframes_t pos,
  75                    void __user *buf, snd_pcm_uframes_t count);
  76        int (*silence)(struct snd_pcm_substream *substream, int channel, 
  77                       snd_pcm_uframes_t pos, snd_pcm_uframes_t count);
  78        struct page *(*page)(struct snd_pcm_substream *substream,
  79                             unsigned long offset);
  80        int (*mmap)(struct snd_pcm_substream *substream, struct vm_area_struct *vma);
  81        int (*ack)(struct snd_pcm_substream *substream);
  82};
  83
  84/*
  85 *
  86 */
  87
  88#if defined(CONFIG_SND_DYNAMIC_MINORS)
  89#define SNDRV_PCM_DEVICES       (SNDRV_OS_MINORS-2)
  90#else
  91#define SNDRV_PCM_DEVICES       8
  92#endif
  93
  94#define SNDRV_PCM_IOCTL1_FALSE          ((void *)0)
  95#define SNDRV_PCM_IOCTL1_TRUE           ((void *)1)
  96
  97#define SNDRV_PCM_IOCTL1_RESET          0
  98#define SNDRV_PCM_IOCTL1_INFO           1
  99#define SNDRV_PCM_IOCTL1_CHANNEL_INFO   2
 100#define SNDRV_PCM_IOCTL1_GSTATE         3
 101#define SNDRV_PCM_IOCTL1_FIFO_SIZE      4
 102
 103#define SNDRV_PCM_TRIGGER_STOP          0
 104#define SNDRV_PCM_TRIGGER_START         1
 105#define SNDRV_PCM_TRIGGER_PAUSE_PUSH    3
 106#define SNDRV_PCM_TRIGGER_PAUSE_RELEASE 4
 107#define SNDRV_PCM_TRIGGER_SUSPEND       5
 108#define SNDRV_PCM_TRIGGER_RESUME        6
 109
 110#define SNDRV_PCM_POS_XRUN              ((snd_pcm_uframes_t)-1)
 111
 112/* If you change this don't forget to change rates[] table in pcm_native.c */
 113#define SNDRV_PCM_RATE_5512             (1<<0)          /* 5512Hz */
 114#define SNDRV_PCM_RATE_8000             (1<<1)          /* 8000Hz */
 115#define SNDRV_PCM_RATE_11025            (1<<2)          /* 11025Hz */
 116#define SNDRV_PCM_RATE_16000            (1<<3)          /* 16000Hz */
 117#define SNDRV_PCM_RATE_22050            (1<<4)          /* 22050Hz */
 118#define SNDRV_PCM_RATE_32000            (1<<5)          /* 32000Hz */
 119#define SNDRV_PCM_RATE_44100            (1<<6)          /* 44100Hz */
 120#define SNDRV_PCM_RATE_48000            (1<<7)          /* 48000Hz */
 121#define SNDRV_PCM_RATE_64000            (1<<8)          /* 64000Hz */
 122#define SNDRV_PCM_RATE_88200            (1<<9)          /* 88200Hz */
 123#define SNDRV_PCM_RATE_96000            (1<<10)         /* 96000Hz */
 124#define SNDRV_PCM_RATE_176400           (1<<11)         /* 176400Hz */
 125#define SNDRV_PCM_RATE_192000           (1<<12)         /* 192000Hz */
 126
 127#define SNDRV_PCM_RATE_CONTINUOUS       (1<<30)         /* continuous range */
 128#define SNDRV_PCM_RATE_KNOT             (1<<31)         /* supports more non-continuos rates */
 129
 130#define SNDRV_PCM_RATE_8000_44100       (SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_11025|\
 131                                         SNDRV_PCM_RATE_16000|SNDRV_PCM_RATE_22050|\
 132                                         SNDRV_PCM_RATE_32000|SNDRV_PCM_RATE_44100)
 133#define SNDRV_PCM_RATE_8000_48000       (SNDRV_PCM_RATE_8000_44100|SNDRV_PCM_RATE_48000)
 134#define SNDRV_PCM_RATE_8000_96000       (SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_64000|\
 135                                         SNDRV_PCM_RATE_88200|SNDRV_PCM_RATE_96000)
 136#define SNDRV_PCM_RATE_8000_192000      (SNDRV_PCM_RATE_8000_96000|SNDRV_PCM_RATE_176400|\
 137                                         SNDRV_PCM_RATE_192000)
 138#define SNDRV_PCM_FMTBIT_S8             (1ULL << SNDRV_PCM_FORMAT_S8)
 139#define SNDRV_PCM_FMTBIT_U8             (1ULL << SNDRV_PCM_FORMAT_U8)
 140#define SNDRV_PCM_FMTBIT_S16_LE         (1ULL << SNDRV_PCM_FORMAT_S16_LE)
 141#define SNDRV_PCM_FMTBIT_S16_BE         (1ULL << SNDRV_PCM_FORMAT_S16_BE)
 142#define SNDRV_PCM_FMTBIT_U16_LE         (1ULL << SNDRV_PCM_FORMAT_U16_LE)
 143#define SNDRV_PCM_FMTBIT_U16_BE         (1ULL << SNDRV_PCM_FORMAT_U16_BE)
 144#define SNDRV_PCM_FMTBIT_S24_LE         (1ULL << SNDRV_PCM_FORMAT_S24_LE)
 145#define SNDRV_PCM_FMTBIT_S24_BE         (1ULL << SNDRV_PCM_FORMAT_S24_BE)
 146#define SNDRV_PCM_FMTBIT_U24_LE         (1ULL << SNDRV_PCM_FORMAT_U24_LE)
 147#define SNDRV_PCM_FMTBIT_U24_BE         (1ULL << SNDRV_PCM_FORMAT_U24_BE)
 148#define SNDRV_PCM_FMTBIT_S32_LE         (1ULL << SNDRV_PCM_FORMAT_S32_LE)
 149#define SNDRV_PCM_FMTBIT_S32_BE         (1ULL << SNDRV_PCM_FORMAT_S32_BE)
 150#define SNDRV_PCM_FMTBIT_U32_LE         (1ULL << SNDRV_PCM_FORMAT_U32_LE)
 151#define SNDRV_PCM_FMTBIT_U32_BE         (1ULL << SNDRV_PCM_FORMAT_U32_BE)
 152#define SNDRV_PCM_FMTBIT_FLOAT_LE       (1ULL << SNDRV_PCM_FORMAT_FLOAT_LE)
 153#define SNDRV_PCM_FMTBIT_FLOAT_BE       (1ULL << SNDRV_PCM_FORMAT_FLOAT_BE)
 154#define SNDRV_PCM_FMTBIT_FLOAT64_LE     (1ULL << SNDRV_PCM_FORMAT_FLOAT64_LE)
 155#define SNDRV_PCM_FMTBIT_FLOAT64_BE     (1ULL << SNDRV_PCM_FORMAT_FLOAT64_BE)
 156#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE (1ULL << SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE)
 157#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE (1ULL << SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE)
 158#define SNDRV_PCM_FMTBIT_MU_LAW         (1ULL << SNDRV_PCM_FORMAT_MU_LAW)
 159#define SNDRV_PCM_FMTBIT_A_LAW          (1ULL << SNDRV_PCM_FORMAT_A_LAW)
 160#define SNDRV_PCM_FMTBIT_IMA_ADPCM      (1ULL << SNDRV_PCM_FORMAT_IMA_ADPCM)
 161#define SNDRV_PCM_FMTBIT_MPEG           (1ULL << SNDRV_PCM_FORMAT_MPEG)
 162#define SNDRV_PCM_FMTBIT_GSM            (1ULL << SNDRV_PCM_FORMAT_GSM)
 163#define SNDRV_PCM_FMTBIT_SPECIAL        (1ULL << SNDRV_PCM_FORMAT_SPECIAL)
 164#define SNDRV_PCM_FMTBIT_S24_3LE        (1ULL << SNDRV_PCM_FORMAT_S24_3LE)
 165#define SNDRV_PCM_FMTBIT_U24_3LE        (1ULL << SNDRV_PCM_FORMAT_U24_3LE)
 166#define SNDRV_PCM_FMTBIT_S24_3BE        (1ULL << SNDRV_PCM_FORMAT_S24_3BE)
 167#define SNDRV_PCM_FMTBIT_U24_3BE        (1ULL << SNDRV_PCM_FORMAT_U24_3BE)
 168#define SNDRV_PCM_FMTBIT_S20_3LE        (1ULL << SNDRV_PCM_FORMAT_S20_3LE)
 169#define SNDRV_PCM_FMTBIT_U20_3LE        (1ULL << SNDRV_PCM_FORMAT_U20_3LE)
 170#define SNDRV_PCM_FMTBIT_S20_3BE        (1ULL << SNDRV_PCM_FORMAT_S20_3BE)
 171#define SNDRV_PCM_FMTBIT_U20_3BE        (1ULL << SNDRV_PCM_FORMAT_U20_3BE)
 172#define SNDRV_PCM_FMTBIT_S18_3LE        (1ULL << SNDRV_PCM_FORMAT_S18_3LE)
 173#define SNDRV_PCM_FMTBIT_U18_3LE        (1ULL << SNDRV_PCM_FORMAT_U18_3LE)
 174#define SNDRV_PCM_FMTBIT_S18_3BE        (1ULL << SNDRV_PCM_FORMAT_S18_3BE)
 175#define SNDRV_PCM_FMTBIT_U18_3BE        (1ULL << SNDRV_PCM_FORMAT_U18_3BE)
 176
 177#ifdef SNDRV_LITTLE_ENDIAN
 178#define SNDRV_PCM_FMTBIT_S16            SNDRV_PCM_FMTBIT_S16_LE
 179#define SNDRV_PCM_FMTBIT_U16            SNDRV_PCM_FMTBIT_U16_LE
 180#define SNDRV_PCM_FMTBIT_S24            SNDRV_PCM_FMTBIT_S24_LE
 181#define SNDRV_PCM_FMTBIT_U24            SNDRV_PCM_FMTBIT_U24_LE
 182#define SNDRV_PCM_FMTBIT_S32            SNDRV_PCM_FMTBIT_S32_LE
 183#define SNDRV_PCM_FMTBIT_U32            SNDRV_PCM_FMTBIT_U32_LE
 184#define SNDRV_PCM_FMTBIT_FLOAT          SNDRV_PCM_FMTBIT_FLOAT_LE
 185#define SNDRV_PCM_FMTBIT_FLOAT64        SNDRV_PCM_FMTBIT_FLOAT64_LE
 186#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE
 187#endif
 188#ifdef SNDRV_BIG_ENDIAN
 189#define SNDRV_PCM_FMTBIT_S16            SNDRV_PCM_FMTBIT_S16_BE
 190#define SNDRV_PCM_FMTBIT_U16            SNDRV_PCM_FMTBIT_U16_BE
 191#define SNDRV_PCM_FMTBIT_S24            SNDRV_PCM_FMTBIT_S24_BE
 192#define SNDRV_PCM_FMTBIT_U24            SNDRV_PCM_FMTBIT_U24_BE
 193#define SNDRV_PCM_FMTBIT_S32            SNDRV_PCM_FMTBIT_S32_BE
 194#define SNDRV_PCM_FMTBIT_U32            SNDRV_PCM_FMTBIT_U32_BE
 195#define SNDRV_PCM_FMTBIT_FLOAT          SNDRV_PCM_FMTBIT_FLOAT_BE
 196#define SNDRV_PCM_FMTBIT_FLOAT64        SNDRV_PCM_FMTBIT_FLOAT64_BE
 197#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE
 198#endif
 199
 200struct snd_pcm_file {
 201        struct snd_pcm_substream *substream;
 202        int no_compat_mmap;
 203};
 204
 205struct snd_pcm_hw_rule;
 206typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params,
 207                                      struct snd_pcm_hw_rule *rule);
 208
 209struct snd_pcm_hw_rule {
 210        unsigned int cond;
 211        snd_pcm_hw_rule_func_t func;
 212        int var;
 213        int deps[4];
 214        void *private;
 215};
 216
 217struct snd_pcm_hw_constraints {
 218        struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK - 
 219                         SNDRV_PCM_HW_PARAM_FIRST_MASK + 1];
 220        struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL -
 221                             SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
 222        unsigned int rules_num;
 223        unsigned int rules_all;
 224        struct snd_pcm_hw_rule *rules;
 225};
 226
 227static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs,
 228                                            snd_pcm_hw_param_t var)
 229{
 230        return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 231}
 232
 233static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs,
 234                                                    snd_pcm_hw_param_t var)
 235{
 236        return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 237}
 238
 239struct snd_ratnum {
 240        unsigned int num;
 241        unsigned int den_min, den_max, den_step;
 242};
 243
 244struct snd_ratden {
 245        unsigned int num_min, num_max, num_step;
 246        unsigned int den;
 247};
 248
 249struct snd_pcm_hw_constraint_ratnums {
 250        int nrats;
 251        struct snd_ratnum *rats;
 252};
 253
 254struct snd_pcm_hw_constraint_ratdens {
 255        int nrats;
 256        struct snd_ratden *rats;
 257};
 258
 259struct snd_pcm_hw_constraint_list {
 260        unsigned int count;
 261        unsigned int *list;
 262        unsigned int mask;
 263};
 264
 265struct snd_pcm_runtime {
 266        /* -- Status -- */
 267        struct snd_pcm_substream *trigger_master;
 268        struct timespec trigger_tstamp; /* trigger timestamp */
 269        int overrange;
 270        snd_pcm_uframes_t avail_max;
 271        snd_pcm_uframes_t hw_ptr_base;  /* Position at buffer restart */
 272        snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time */
 273        unsigned long hw_ptr_jiffies;   /* Time when hw_ptr is updated */
 274        snd_pcm_sframes_t delay;        /* extra delay; typically FIFO size */
 275
 276        /* -- HW params -- */
 277        snd_pcm_access_t access;        /* access mode */
 278        snd_pcm_format_t format;        /* SNDRV_PCM_FORMAT_* */
 279        snd_pcm_subformat_t subformat;  /* subformat */
 280        unsigned int rate;              /* rate in Hz */
 281        unsigned int channels;          /* channels */
 282        snd_pcm_uframes_t period_size;  /* period size */
 283        unsigned int periods;           /* periods */
 284        snd_pcm_uframes_t buffer_size;  /* buffer size */
 285        snd_pcm_uframes_t min_align;    /* Min alignment for the format */
 286        size_t byte_align;
 287        unsigned int frame_bits;
 288        unsigned int sample_bits;
 289        unsigned int info;
 290        unsigned int rate_num;
 291        unsigned int rate_den;
 292
 293        /* -- SW params -- */
 294        int tstamp_mode;                /* mmap timestamp is updated */
 295        unsigned int period_step;
 296        snd_pcm_uframes_t start_threshold;
 297        snd_pcm_uframes_t stop_threshold;
 298        snd_pcm_uframes_t silence_threshold; /* Silence filling happens when
 299                                                noise is nearest than this */
 300        snd_pcm_uframes_t silence_size; /* Silence filling size */
 301        snd_pcm_uframes_t boundary;     /* pointers wrap point */
 302
 303        snd_pcm_uframes_t silence_start; /* starting pointer to silence area */
 304        snd_pcm_uframes_t silence_filled; /* size filled with silence */
 305
 306        union snd_pcm_sync_id sync;     /* hardware synchronization ID */
 307
 308        /* -- mmap -- */
 309        struct snd_pcm_mmap_status *status;
 310        struct snd_pcm_mmap_control *control;
 311
 312        /* -- locking / scheduling -- */
 313        wait_queue_head_t sleep;
 314        struct fasync_struct *fasync;
 315
 316        /* -- private section -- */
 317        void *private_data;
 318        void (*private_free)(struct snd_pcm_runtime *runtime);
 319
 320        /* -- hardware description -- */
 321        struct snd_pcm_hardware hw;
 322        struct snd_pcm_hw_constraints hw_constraints;
 323
 324        /* -- interrupt callbacks -- */
 325        void (*transfer_ack_begin)(struct snd_pcm_substream *substream);
 326        void (*transfer_ack_end)(struct snd_pcm_substream *substream);
 327
 328        /* -- timer -- */
 329        unsigned int timer_resolution;  /* timer resolution */
 330        int tstamp_type;                /* timestamp type */
 331
 332        /* -- DMA -- */           
 333        unsigned char *dma_area;        /* DMA area */
 334        dma_addr_t dma_addr;            /* physical bus address (not accessible from main CPU) */
 335        size_t dma_bytes;               /* size of DMA area */
 336
 337        struct snd_dma_buffer *dma_buffer_p;    /* allocated buffer */
 338
 339#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 340        /* -- OSS things -- */
 341        struct snd_pcm_oss_runtime oss;
 342#endif
 343};
 344
 345struct snd_pcm_group {          /* keep linked substreams */
 346        spinlock_t lock;
 347        struct list_head substreams;
 348        int count;
 349};
 350
 351struct snd_pcm_substream {
 352        struct snd_pcm *pcm;
 353        struct snd_pcm_str *pstr;
 354        void *private_data;             /* copied from pcm->private_data */
 355        int number;
 356        char name[32];                  /* substream name */
 357        int stream;                     /* stream (direction) */
 358        char latency_id[20];            /* latency identifier */
 359        size_t buffer_bytes_max;        /* limit ring buffer size */
 360        struct snd_dma_buffer dma_buffer;
 361        unsigned int dma_buf_id;
 362        size_t dma_max;
 363        /* -- hardware operations -- */
 364        struct snd_pcm_ops *ops;
 365        /* -- runtime information -- */
 366        struct snd_pcm_runtime *runtime;
 367        /* -- timer section -- */
 368        struct snd_timer *timer;                /* timer */
 369        unsigned timer_running: 1;      /* time is running */
 370        /* -- next substream -- */
 371        struct snd_pcm_substream *next;
 372        /* -- linked substreams -- */
 373        struct list_head link_list;     /* linked list member */
 374        struct snd_pcm_group self_group;        /* fake group for non linked substream (with substream lock inside) */
 375        struct snd_pcm_group *group;            /* pointer to current group */
 376        /* -- assigned files -- */
 377        void *file;
 378        int ref_count;
 379        atomic_t mmap_count;
 380        unsigned int f_flags;
 381        void (*pcm_release)(struct snd_pcm_substream *);
 382#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 383        /* -- OSS things -- */
 384        struct snd_pcm_oss_substream oss;
 385#endif
 386#ifdef CONFIG_SND_VERBOSE_PROCFS
 387        struct snd_info_entry *proc_root;
 388        struct snd_info_entry *proc_info_entry;
 389        struct snd_info_entry *proc_hw_params_entry;
 390        struct snd_info_entry *proc_sw_params_entry;
 391        struct snd_info_entry *proc_status_entry;
 392        struct snd_info_entry *proc_prealloc_entry;
 393        struct snd_info_entry *proc_prealloc_max_entry;
 394#endif
 395        /* misc flags */
 396        unsigned int hw_opened: 1;
 397};
 398
 399#define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0)
 400
 401
 402struct snd_pcm_str {
 403        int stream;                             /* stream (direction) */
 404        struct snd_pcm *pcm;
 405        /* -- substreams -- */
 406        unsigned int substream_count;
 407        unsigned int substream_opened;
 408        struct snd_pcm_substream *substream;
 409#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 410        /* -- OSS things -- */
 411        struct snd_pcm_oss_stream oss;
 412#endif
 413#ifdef CONFIG_SND_VERBOSE_PROCFS
 414        struct snd_info_entry *proc_root;
 415        struct snd_info_entry *proc_info_entry;
 416#ifdef CONFIG_SND_PCM_XRUN_DEBUG
 417        unsigned int xrun_debug;        /* 0 = disabled, 1 = verbose, 2 = stacktrace */
 418        struct snd_info_entry *proc_xrun_debug_entry;
 419#endif
 420#endif
 421};
 422
 423struct snd_pcm {
 424        struct snd_card *card;
 425        struct list_head list;
 426        int device; /* device number */
 427        unsigned int info_flags;
 428        unsigned short dev_class;
 429        unsigned short dev_subclass;
 430        char id[64];
 431        char name[80];
 432        struct snd_pcm_str streams[2];
 433        struct mutex open_mutex;
 434        wait_queue_head_t open_wait;
 435        void *private_data;
 436        void (*private_free) (struct snd_pcm *pcm);
 437        struct device *dev; /* actual hw device this belongs to */
 438#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 439        struct snd_pcm_oss oss;
 440#endif
 441};
 442
 443struct snd_pcm_notify {
 444        int (*n_register) (struct snd_pcm * pcm);
 445        int (*n_disconnect) (struct snd_pcm * pcm);
 446        int (*n_unregister) (struct snd_pcm * pcm);
 447        struct list_head list;
 448};
 449
 450/*
 451 *  Registering
 452 */
 453
 454extern const struct file_operations snd_pcm_f_ops[2];
 455
 456int snd_pcm_new(struct snd_card *card, const char *id, int device,
 457                int playback_count, int capture_count,
 458                struct snd_pcm **rpcm);
 459int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
 460
 461int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
 462
 463/*
 464 *  Native I/O
 465 */
 466
 467extern rwlock_t snd_pcm_link_rwlock;
 468
 469int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
 470int snd_pcm_info_user(struct snd_pcm_substream *substream,
 471                      struct snd_pcm_info __user *info);
 472int snd_pcm_status(struct snd_pcm_substream *substream,
 473                   struct snd_pcm_status *status);
 474int snd_pcm_start(struct snd_pcm_substream *substream);
 475int snd_pcm_stop(struct snd_pcm_substream *substream, int status);
 476int snd_pcm_drain_done(struct snd_pcm_substream *substream);
 477#ifdef CONFIG_PM
 478int snd_pcm_suspend(struct snd_pcm_substream *substream);
 479int snd_pcm_suspend_all(struct snd_pcm *pcm);
 480#endif
 481int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
 482int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
 483                           struct snd_pcm_substream **rsubstream);
 484void snd_pcm_release_substream(struct snd_pcm_substream *substream);
 485int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
 486                             struct snd_pcm_substream **rsubstream);
 487void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
 488void snd_pcm_vma_notify_data(void *client, void *data);
 489int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
 490
 491/*
 492 *  PCM library
 493 */
 494
 495static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
 496{
 497        return substream->group != &substream->self_group;
 498}
 499
 500static inline void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
 501{
 502        read_lock(&snd_pcm_link_rwlock);
 503        spin_lock(&substream->self_group.lock);
 504}
 505
 506static inline void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
 507{
 508        spin_unlock(&substream->self_group.lock);
 509        read_unlock(&snd_pcm_link_rwlock);
 510}
 511
 512static inline void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
 513{
 514        read_lock_irq(&snd_pcm_link_rwlock);
 515        spin_lock(&substream->self_group.lock);
 516}
 517
 518static inline void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
 519{
 520        spin_unlock(&substream->self_group.lock);
 521        read_unlock_irq(&snd_pcm_link_rwlock);
 522}
 523
 524#define snd_pcm_stream_lock_irqsave(substream, flags) \
 525do { \
 526        read_lock_irqsave(&snd_pcm_link_rwlock, (flags)); \
 527        spin_lock(&substream->self_group.lock); \
 528} while (0)
 529
 530#define snd_pcm_stream_unlock_irqrestore(substream, flags) \
 531do { \
 532        spin_unlock(&substream->self_group.lock); \
 533        read_unlock_irqrestore(&snd_pcm_link_rwlock, (flags)); \
 534} while (0)
 535
 536#define snd_pcm_group_for_each_entry(s, substream) \
 537        list_for_each_entry(s, &substream->group->substreams, link_list)
 538
 539static inline int snd_pcm_running(struct snd_pcm_substream *substream)
 540{
 541        return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 542                (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
 543                 substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
 544}
 545
 546static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
 547{
 548        return size * 8 / runtime->sample_bits;
 549}
 550
 551static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
 552{
 553        return size * 8 / runtime->frame_bits;
 554}
 555
 556static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
 557{
 558        return size * runtime->sample_bits / 8;
 559}
 560
 561static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
 562{
 563        return size * runtime->frame_bits / 8;
 564}
 565
 566static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
 567{
 568        return bytes % runtime->byte_align == 0;
 569}
 570
 571static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
 572{
 573        struct snd_pcm_runtime *runtime = substream->runtime;
 574        return frames_to_bytes(runtime, runtime->buffer_size);
 575}
 576
 577static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
 578{
 579        struct snd_pcm_runtime *runtime = substream->runtime;
 580        return frames_to_bytes(runtime, runtime->period_size);
 581}
 582
 583/*
 584 *  result is: 0 ... (boundary - 1)
 585 */
 586static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
 587{
 588        snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
 589        if (avail < 0)
 590                avail += runtime->boundary;
 591        else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
 592                avail -= runtime->boundary;
 593        return avail;
 594}
 595
 596/*
 597 *  result is: 0 ... (boundary - 1)
 598 */
 599static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
 600{
 601        snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
 602        if (avail < 0)
 603                avail += runtime->boundary;
 604        return avail;
 605}
 606
 607static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
 608{
 609        return runtime->buffer_size - snd_pcm_playback_avail(runtime);
 610}
 611
 612static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
 613{
 614        return runtime->buffer_size - snd_pcm_capture_avail(runtime);
 615}
 616
 617/**
 618 * snd_pcm_playback_ready - check whether the playback buffer is available
 619 * @substream: the pcm substream instance
 620 *
 621 * Checks whether enough free space is available on the playback buffer.
 622 *
 623 * Returns non-zero if available, or zero if not.
 624 */
 625static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
 626{
 627        struct snd_pcm_runtime *runtime = substream->runtime;
 628        return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
 629}
 630
 631/**
 632 * snd_pcm_capture_ready - check whether the capture buffer is available
 633 * @substream: the pcm substream instance
 634 *
 635 * Checks whether enough capture data is available on the capture buffer.
 636 *
 637 * Returns non-zero if available, or zero if not.
 638 */
 639static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
 640{
 641        struct snd_pcm_runtime *runtime = substream->runtime;
 642        return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
 643}
 644
 645/**
 646 * snd_pcm_playback_data - check whether any data exists on the playback buffer
 647 * @substream: the pcm substream instance
 648 *
 649 * Checks whether any data exists on the playback buffer. If stop_threshold
 650 * is bigger or equal to boundary, then this function returns always non-zero.
 651 *
 652 * Returns non-zero if exists, or zero if not.
 653 */
 654static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
 655{
 656        struct snd_pcm_runtime *runtime = substream->runtime;
 657        
 658        if (runtime->stop_threshold >= runtime->boundary)
 659                return 1;
 660        return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
 661}
 662
 663/**
 664 * snd_pcm_playback_empty - check whether the playback buffer is empty
 665 * @substream: the pcm substream instance
 666 *
 667 * Checks whether the playback buffer is empty.
 668 *
 669 * Returns non-zero if empty, or zero if not.
 670 */
 671static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
 672{
 673        struct snd_pcm_runtime *runtime = substream->runtime;
 674        return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
 675}
 676
 677/**
 678 * snd_pcm_capture_empty - check whether the capture buffer is empty
 679 * @substream: the pcm substream instance
 680 *
 681 * Checks whether the capture buffer is empty.
 682 *
 683 * Returns non-zero if empty, or zero if not.
 684 */
 685static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
 686{
 687        struct snd_pcm_runtime *runtime = substream->runtime;
 688        return snd_pcm_capture_avail(runtime) == 0;
 689}
 690
 691static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream, 
 692                                        struct snd_pcm_substream *master)
 693{
 694        substream->runtime->trigger_master = master;
 695}
 696
 697static inline int hw_is_mask(int var)
 698{
 699        return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
 700                var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
 701}
 702
 703static inline int hw_is_interval(int var)
 704{
 705        return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
 706                var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
 707}
 708
 709static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
 710                                     snd_pcm_hw_param_t var)
 711{
 712        return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 713}
 714
 715static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
 716                                             snd_pcm_hw_param_t var)
 717{
 718        return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 719}
 720
 721static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
 722                                             snd_pcm_hw_param_t var)
 723{
 724        return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 725}
 726
 727static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
 728                                                     snd_pcm_hw_param_t var)
 729{
 730        return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 731}
 732
 733#define params_access(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_ACCESS))
 734#define params_format(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_FORMAT))
 735#define params_subformat(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_SUBFORMAT))
 736#define params_channels(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_CHANNELS)->min
 737#define params_rate(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_RATE)->min
 738#define params_period_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min
 739#define params_period_bytes(p) ((params_period_size(p)*snd_pcm_format_physical_width(params_format(p))*params_channels(p))/8)
 740#define params_periods(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIODS)->min
 741#define params_buffer_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min
 742#define params_buffer_bytes(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min
 743
 744
 745int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
 746void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
 747void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
 748void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b, 
 749                          unsigned int k, struct snd_interval *c);
 750void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
 751                          const struct snd_interval *b, struct snd_interval *c);
 752int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask);
 753int snd_interval_ratnum(struct snd_interval *i,
 754                        unsigned int rats_count, struct snd_ratnum *rats,
 755                        unsigned int *nump, unsigned int *denp);
 756
 757void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
 758void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
 759int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
 760
 761int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
 762
 763int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream);
 764int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream);
 765
 766int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 767                               u_int32_t mask);
 768int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 769                                 u_int64_t mask);
 770int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 771                                 unsigned int min, unsigned int max);
 772int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
 773int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime, 
 774                               unsigned int cond,
 775                               snd_pcm_hw_param_t var,
 776                               struct snd_pcm_hw_constraint_list *l);
 777int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime, 
 778                                  unsigned int cond,
 779                                  snd_pcm_hw_param_t var,
 780                                  struct snd_pcm_hw_constraint_ratnums *r);
 781int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime, 
 782                                  unsigned int cond,
 783                                  snd_pcm_hw_param_t var,
 784                                  struct snd_pcm_hw_constraint_ratdens *r);
 785int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime, 
 786                                 unsigned int cond,
 787                                 unsigned int width,
 788                                 unsigned int msbits);
 789int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
 790                               unsigned int cond,
 791                               snd_pcm_hw_param_t var,
 792                               unsigned long step);
 793int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
 794                               unsigned int cond,
 795                               snd_pcm_hw_param_t var);
 796int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
 797                        unsigned int cond,
 798                        int var,
 799                        snd_pcm_hw_rule_func_t func, void *private,
 800                        int dep, ...);
 801
 802int snd_pcm_format_signed(snd_pcm_format_t format);
 803int snd_pcm_format_unsigned(snd_pcm_format_t format);
 804int snd_pcm_format_linear(snd_pcm_format_t format);
 805int snd_pcm_format_little_endian(snd_pcm_format_t format);
 806int snd_pcm_format_big_endian(snd_pcm_format_t format);
 807#if 0 /* just for DocBook */
 808/**
 809 * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
 810 * @format: the format to check
 811 *
 812 * Returns 1 if the given PCM format is CPU-endian, 0 if
 813 * opposite, or a negative error code if endian not specified.
 814 */
 815int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
 816#endif /* DocBook */
 817#ifdef SNDRV_LITTLE_ENDIAN
 818#define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
 819#else
 820#define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
 821#endif
 822int snd_pcm_format_width(snd_pcm_format_t format);                      /* in bits */
 823int snd_pcm_format_physical_width(snd_pcm_format_t format);             /* in bits */
 824ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
 825const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
 826int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
 827snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsignd, int big_endian);
 828
 829void snd_pcm_set_ops(struct snd_pcm * pcm, int direction, struct snd_pcm_ops *ops);
 830void snd_pcm_set_sync(struct snd_pcm_substream *substream);
 831int snd_pcm_lib_interleave_len(struct snd_pcm_substream *substream);
 832int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
 833                      unsigned int cmd, void *arg);                      
 834int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream);
 835int snd_pcm_playback_xrun_check(struct snd_pcm_substream *substream);
 836int snd_pcm_capture_xrun_check(struct snd_pcm_substream *substream);
 837int snd_pcm_playback_xrun_asap(struct snd_pcm_substream *substream);
 838int snd_pcm_capture_xrun_asap(struct snd_pcm_substream *substream);
 839void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr);
 840void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
 841snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream,
 842                                    const void __user *buf,
 843                                    snd_pcm_uframes_t frames);
 844snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream,
 845                                   void __user *buf, snd_pcm_uframes_t frames);
 846snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
 847                                     void __user **bufs, snd_pcm_uframes_t frames);
 848snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
 849                                    void __user **bufs, snd_pcm_uframes_t frames);
 850
 851extern const struct snd_pcm_hw_constraint_list snd_pcm_known_rates;
 852
 853int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime);
 854unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate);
 855
 856static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
 857                                              struct snd_dma_buffer *bufp)
 858{
 859        struct snd_pcm_runtime *runtime = substream->runtime;
 860        if (bufp) {
 861                runtime->dma_buffer_p = bufp;
 862                runtime->dma_area = bufp->area;
 863                runtime->dma_addr = bufp->addr;
 864                runtime->dma_bytes = bufp->bytes;
 865        } else {
 866                runtime->dma_buffer_p = NULL;
 867                runtime->dma_area = NULL;
 868                runtime->dma_addr = 0;
 869                runtime->dma_bytes = 0;
 870        }
 871}
 872
 873/*
 874 *  Timer interface
 875 */
 876
 877void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream);
 878void snd_pcm_timer_init(struct snd_pcm_substream *substream);
 879void snd_pcm_timer_done(struct snd_pcm_substream *substream);
 880
 881static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime,
 882                                   struct timespec *tv)
 883{
 884        if (runtime->tstamp_type == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
 885                do_posix_clock_monotonic_gettime(tv);
 886        else
 887                getnstimeofday(tv);
 888}
 889
 890/*
 891 *  Memory
 892 */
 893
 894int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
 895int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
 896int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
 897                                  int type, struct device *data,
 898                                  size_t size, size_t max);
 899int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
 900                                          int type, void *data,
 901                                          size_t size, size_t max);
 902int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
 903int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
 904
 905#ifdef CONFIG_SND_DMA_SGBUF
 906/*
 907 * SG-buffer handling
 908 */
 909#define snd_pcm_substream_sgbuf(substream) \
 910        ((substream)->runtime->dma_buffer_p->private_data)
 911
 912static inline dma_addr_t
 913snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
 914{
 915        struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream);
 916        return snd_sgbuf_get_addr(sg, ofs);
 917}
 918
 919static inline void *
 920snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
 921{
 922        struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream);
 923        return snd_sgbuf_get_ptr(sg, ofs);
 924}
 925
 926struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream,
 927                                    unsigned long offset);
 928unsigned int snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
 929                                          unsigned int ofs, unsigned int size);
 930
 931#else /* !SND_DMA_SGBUF */
 932/*
 933 * fake using a continuous buffer
 934 */
 935static inline dma_addr_t
 936snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
 937{
 938        return substream->runtime->dma_addr + ofs;
 939}
 940
 941static inline void *
 942snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
 943{
 944        return substream->runtime->dma_area + ofs;
 945}
 946
 947#define snd_pcm_sgbuf_ops_page  NULL
 948
 949#define snd_pcm_sgbuf_get_chunk_size(subs, ofs, size)   (size)
 950
 951#endif /* SND_DMA_SGBUF */
 952
 953/* handle mmap counter - PCM mmap callback should handle this counter properly */
 954static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
 955{
 956        struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
 957        atomic_inc(&substream->mmap_count);
 958}
 959
 960static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
 961{
 962        struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
 963        atomic_dec(&substream->mmap_count);
 964}
 965
 966/* mmap for io-memory area */
 967#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
 968#define SNDRV_PCM_INFO_MMAP_IOMEM       SNDRV_PCM_INFO_MMAP
 969int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
 970#else
 971#define SNDRV_PCM_INFO_MMAP_IOMEM       0
 972#define snd_pcm_lib_mmap_iomem  NULL
 973#endif
 974
 975static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
 976{
 977        *max = dma < 4 ? 64 * 1024 : 128 * 1024;
 978}
 979
 980/*
 981 *  Misc
 982 */
 983
 984#define SNDRV_PCM_DEFAULT_CON_SPDIF     (IEC958_AES0_CON_EMPHASIS_NONE|\
 985                                         (IEC958_AES1_CON_ORIGINAL<<8)|\
 986                                         (IEC958_AES1_CON_PCM_CODER<<8)|\
 987                                         (IEC958_AES3_CON_FS_48000<<24))
 988
 989#define PCM_RUNTIME_CHECK(sub) snd_BUG_ON(!(sub) || !(sub)->runtime)
 990
 991const char *snd_pcm_format_name(snd_pcm_format_t format);
 992
 993#endif /* __SOUND_PCM_H */
 994
Hosted by Missing Link Electronics. The original LXR software by the LXR community, this experimental version by lxr@linux.no.