LXR linux/include/sound/pcm.h

   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 pid;
 352
 353struct snd_pcm_substream {
 354        struct snd_pcm *pcm;
 355        struct snd_pcm_str *pstr;
 356        void *private_data;             /* copied from pcm->private_data */
 357        int number;
 358        char name[32];                  /* substream name */
 359        int stream;                     /* stream (direction) */
 360        char latency_id[20];            /* latency identifier */
 361        size_t buffer_bytes_max;        /* limit ring buffer size */
 362        struct snd_dma_buffer dma_buffer;
 363        unsigned int dma_buf_id;
 364        size_t dma_max;
 365        /* -- hardware operations -- */
 366        struct snd_pcm_ops *ops;
 367        /* -- runtime information -- */
 368        struct snd_pcm_runtime *runtime;
 369        /* -- timer section -- */
 370        struct snd_timer *timer;                /* timer */
 371        unsigned timer_running: 1;      /* time is running */
 372        /* -- next substream -- */
 373        struct snd_pcm_substream *next;
 374        /* -- linked substreams -- */
 375        struct list_head link_list;     /* linked list member */
 376        struct snd_pcm_group self_group;        /* fake group for non linked substream (with substream lock inside) */
 377        struct snd_pcm_group *group;            /* pointer to current group */
 378        /* -- assigned files -- */
 379        void *file;
 380        int ref_count;
 381        atomic_t mmap_count;
 382        unsigned int f_flags;
 383        void (*pcm_release)(struct snd_pcm_substream *);
 384        struct pid *pid;
 385#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 386        /* -- OSS things -- */
 387        struct snd_pcm_oss_substream oss;
 388#endif
 389#ifdef CONFIG_SND_VERBOSE_PROCFS
 390        struct snd_info_entry *proc_root;
 391        struct snd_info_entry *proc_info_entry;
 392        struct snd_info_entry *proc_hw_params_entry;
 393        struct snd_info_entry *proc_sw_params_entry;
 394        struct snd_info_entry *proc_status_entry;
 395        struct snd_info_entry *proc_prealloc_entry;
 396        struct snd_info_entry *proc_prealloc_max_entry;
 397#endif
 398        /* misc flags */
 399        unsigned int hw_opened: 1;
 400};
 401
 402#define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0)
 403
 404
 405struct snd_pcm_str {
 406        int stream;                             /* stream (direction) */
 407        struct snd_pcm *pcm;
 408        /* -- substreams -- */
 409        unsigned int substream_count;
 410        unsigned int substream_opened;
 411        struct snd_pcm_substream *substream;
 412#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 413        /* -- OSS things -- */
 414        struct snd_pcm_oss_stream oss;
 415#endif
 416#ifdef CONFIG_SND_VERBOSE_PROCFS
 417        struct snd_info_entry *proc_root;
 418        struct snd_info_entry *proc_info_entry;
 419#ifdef CONFIG_SND_PCM_XRUN_DEBUG
 420        unsigned int xrun_debug;        /* 0 = disabled, 1 = verbose, 2 = stacktrace */
 421        struct snd_info_entry *proc_xrun_debug_entry;
 422#endif
 423#endif
 424};
 425
 426struct snd_pcm {
 427        struct snd_card *card;
 428        struct list_head list;
 429        int device; /* device number */
 430        unsigned int info_flags;
 431        unsigned short dev_class;
 432        unsigned short dev_subclass;
 433        char id[64];
 434        char name[80];
 435        struct snd_pcm_str streams[2];
 436        struct mutex open_mutex;
 437        wait_queue_head_t open_wait;
 438        void *private_data;
 439        void (*private_free) (struct snd_pcm *pcm);
 440        struct device *dev; /* actual hw device this belongs to */
 441#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 442        struct snd_pcm_oss oss;
 443#endif
 444};
 445
 446struct snd_pcm_notify {
 447        int (*n_register) (struct snd_pcm * pcm);
 448        int (*n_disconnect) (struct snd_pcm * pcm);
 449        int (*n_unregister) (struct snd_pcm * pcm);
 450        struct list_head list;
 451};
 452
 453/*
 454 *  Registering
 455 */
 456
 457extern const struct file_operations snd_pcm_f_ops[2];
 458
 459int snd_pcm_new(struct snd_card *card, const char *id, int device,
 460                int playback_count, int capture_count,
 461                struct snd_pcm **rpcm);
 462int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
 463
 464int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
 465
 466/*
 467 *  Native I/O
 468 */
 469
 470extern rwlock_t snd_pcm_link_rwlock;
 471
 472int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
 473int snd_pcm_info_user(struct snd_pcm_substream *substream,
 474                      struct snd_pcm_info __user *info);
 475int snd_pcm_status(struct snd_pcm_substream *substream,
 476                   struct snd_pcm_status *status);
 477int snd_pcm_start(struct snd_pcm_substream *substream);
 478int snd_pcm_stop(struct snd_pcm_substream *substream, int status);
 479int snd_pcm_drain_done(struct snd_pcm_substream *substream);
 480#ifdef CONFIG_PM
 481int snd_pcm_suspend(struct snd_pcm_substream *substream);
 482int snd_pcm_suspend_all(struct snd_pcm *pcm);
 483#endif
 484int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
 485int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
 486                           struct snd_pcm_substream **rsubstream);
 487void snd_pcm_release_substream(struct snd_pcm_substream *substream);
 488int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
 489                             struct snd_pcm_substream **rsubstream);
 490void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
 491void snd_pcm_vma_notify_data(void *client, void *data);
 492int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
 493
 494/*
 495 *  PCM library
 496 */
 497
 498static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
 499{
 500        return substream->group != &substream->self_group;
 501}
 502
 503static inline void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
 504{
 505        read_lock(&snd_pcm_link_rwlock);
 506        spin_lock(&substream->self_group.lock);
 507}
 508
 509static inline void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
 510{
 511        spin_unlock(&substream->self_group.lock);
 512        read_unlock(&snd_pcm_link_rwlock);
 513}
 514
 515static inline void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
 516{
 517        read_lock_irq(&snd_pcm_link_rwlock);
 518        spin_lock(&substream->self_group.lock);
 519}
 520
 521static inline void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
 522{
 523        spin_unlock(&substream->self_group.lock);
 524        read_unlock_irq(&snd_pcm_link_rwlock);
 525}
 526
 527#define snd_pcm_stream_lock_irqsave(substream, flags) \
 528do { \
 529        read_lock_irqsave(&snd_pcm_link_rwlock, (flags)); \
 530        spin_lock(&substream->self_group.lock); \
 531} while (0)
 532
 533#define snd_pcm_stream_unlock_irqrestore(substream, flags) \
 534do { \
 535        spin_unlock(&substream->self_group.lock); \
 536        read_unlock_irqrestore(&snd_pcm_link_rwlock, (flags)); \
 537} while (0)
 538
 539#define snd_pcm_group_for_each_entry(s, substream) \
 540        list_for_each_entry(s, &substream->group->substreams, link_list)
 541
 542static inline int snd_pcm_running(struct snd_pcm_substream *substream)
 543{
 544        return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 545                (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
 546                 substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
 547}
 548
 549static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
 550{
 551        return size * 8 / runtime->sample_bits;
 552}
 553
 554static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
 555{
 556        return size * 8 / runtime->frame_bits;
 557}
 558
 559static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
 560{
 561        return size * runtime->sample_bits / 8;
 562}
 563
 564static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
 565{
 566        return size * runtime->frame_bits / 8;
 567}
 568
 569static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
 570{
 571        return bytes % runtime->byte_align == 0;
 572}
 573
 574static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
 575{
 576        struct snd_pcm_runtime *runtime = substream->runtime;
 577        return frames_to_bytes(runtime, runtime->buffer_size);
 578}
 579
 580static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
 581{
 582        struct snd_pcm_runtime *runtime = substream->runtime;
 583        return frames_to_bytes(runtime, runtime->period_size);
 584}
 585
 586/*
 587 *  result is: 0 ... (boundary - 1)
 588 */
 589static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
 590{
 591        snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
 592        if (avail < 0)
 593                avail += runtime->boundary;
 594        else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
 595                avail -= runtime->boundary;
 596        return avail;
 597}
 598
 599/*
 600 *  result is: 0 ... (boundary - 1)
 601 */
 602static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
 603{
 604        snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
 605        if (avail < 0)
 606                avail += runtime->boundary;
 607        return avail;
 608}
 609
 610static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
 611{
 612        return runtime->buffer_size - snd_pcm_playback_avail(runtime);
 613}
 614
 615static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
 616{
 617        return runtime->buffer_size - snd_pcm_capture_avail(runtime);
 618}
 619
 620/**
 621 * snd_pcm_playback_ready - check whether the playback buffer is available
 622 * @substream: the pcm substream instance
 623 *
 624 * Checks whether enough free space is available on the playback buffer.
 625 *
 626 * Returns non-zero if available, or zero if not.
 627 */
 628static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
 629{
 630        struct snd_pcm_runtime *runtime = substream->runtime;
 631        return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
 632}
 633
 634/**
 635 * snd_pcm_capture_ready - check whether the capture buffer is available
 636 * @substream: the pcm substream instance
 637 *
 638 * Checks whether enough capture data is available on the capture buffer.
 639 *
 640 * Returns non-zero if available, or zero if not.
 641 */
 642static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
 643{
 644        struct snd_pcm_runtime *runtime = substream->runtime;
 645        return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
 646}
 647
 648/**
 649 * snd_pcm_playback_data - check whether any data exists on the playback buffer
 650 * @substream: the pcm substream instance
 651 *
 652 * Checks whether any data exists on the playback buffer. If stop_threshold
 653 * is bigger or equal to boundary, then this function returns always non-zero.
 654 *
 655 * Returns non-zero if exists, or zero if not.
 656 */
 657static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
 658{
 659        struct snd_pcm_runtime *runtime = substream->runtime;
 660        
 661        if (runtime->stop_threshold >= runtime->boundary)
 662                return 1;
 663        return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
 664}
 665
 666/**
 667 * snd_pcm_playback_empty - check whether the playback buffer is empty
 668 * @substream: the pcm substream instance
 669 *
 670 * Checks whether the playback buffer is empty.
 671 *
 672 * Returns non-zero if empty, or zero if not.
 673 */
 674static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
 675{
 676        struct snd_pcm_runtime *runtime = substream->runtime;
 677        return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
 678}
 679
 680/**
 681 * snd_pcm_capture_empty - check whether the capture buffer is empty
 682 * @substream: the pcm substream instance
 683 *
 684 * Checks whether the capture buffer is empty.
 685 *
 686 * Returns non-zero if empty, or zero if not.
 687 */
 688static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
 689{
 690        struct snd_pcm_runtime *runtime = substream->runtime;
 691        return snd_pcm_capture_avail(runtime) == 0;
 692}
 693
 694static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream, 
 695                                        struct snd_pcm_substream *master)
 696{
 697        substream->runtime->trigger_master = master;
 698}
 699
 700static inline int hw_is_mask(int var)
 701{
 702        return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
 703                var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
 704}
 705
 706static inline int hw_is_interval(int var)
 707{
 708        return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
 709                var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
 710}
 711
 712static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
 713                                     snd_pcm_hw_param_t var)
 714{
 715        return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 716}
 717
 718static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
 719                                             snd_pcm_hw_param_t var)
 720{
 721        return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 722}
 723
 724static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
 725                                             snd_pcm_hw_param_t var)
 726{
 727        return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 728}
 729
 730static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
 731                                                     snd_pcm_hw_param_t var)
 732{
 733        return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 734}
 735
 736#define params_access(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_ACCESS))
 737#define params_format(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_FORMAT))
 738#define params_subformat(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_SUBFORMAT))
 739#define params_channels(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_CHANNELS)->min
 740#define params_rate(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_RATE)->min
 741#define params_period_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min
 742#define params_period_bytes(p) ((params_period_size(p)*snd_pcm_format_physical_width(params_format(p))*params_channels(p))/8)
 743#define params_periods(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIODS)->min
 744#define params_buffer_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min
 745#define params_buffer_bytes(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min
 746
 747
 748int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
 749void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
 750void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
 751void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b, 
 752                          unsigned int k, struct snd_interval *c);
 753void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
 754                          const struct snd_interval *b, struct snd_interval *c);
 755int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask);
 756int snd_interval_ratnum(struct snd_interval *i,
 757                        unsigned int rats_count, struct snd_ratnum *rats,
 758                        unsigned int *nump, unsigned int *denp);
 759
 760void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
 761void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
 762int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
 763
 764int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
 765
 766int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream);
 767int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream);
 768
 769int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 770                               u_int32_t mask);
 771int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 772                                 u_int64_t mask);
 773int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 774                                 unsigned int min, unsigned int max);
 775int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
 776int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime, 
 777                               unsigned int cond,
 778                               snd_pcm_hw_param_t var,
 779                               struct snd_pcm_hw_constraint_list *l);
 780int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime, 
 781                                  unsigned int cond,
 782                                  snd_pcm_hw_param_t var,
 783                                  struct snd_pcm_hw_constraint_ratnums *r);
 784int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime, 
 785                                  unsigned int cond,
 786                                  snd_pcm_hw_param_t var,
 787                                  struct snd_pcm_hw_constraint_ratdens *r);
 788int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime, 
 789                                 unsigned int cond,
 790                                 unsigned int width,
 791                                 unsigned int msbits);
 792int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
 793                               unsigned int cond,
 794                               snd_pcm_hw_param_t var,
 795                               unsigned long step);
 796int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
 797                               unsigned int cond,
 798                               snd_pcm_hw_param_t var);
 799int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
 800                        unsigned int cond,
 801                        int var,
 802                        snd_pcm_hw_rule_func_t func, void *private,
 803                        int dep, ...);
 804
 805int snd_pcm_format_signed(snd_pcm_format_t format);
 806int snd_pcm_format_unsigned(snd_pcm_format_t format);
 807int snd_pcm_format_linear(snd_pcm_format_t format);
 808int snd_pcm_format_little_endian(snd_pcm_format_t format);
 809int snd_pcm_format_big_endian(snd_pcm_format_t format);
 810#if 0 /* just for DocBook */
 811/**
 812 * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
 813 * @format: the format to check
 814 *
 815 * Returns 1 if the given PCM format is CPU-endian, 0 if
 816 * opposite, or a negative error code if endian not specified.
 817 */
 818int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
 819#endif /* DocBook */
 820#ifdef SNDRV_LITTLE_ENDIAN
 821#define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
 822#else
 823#define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
 824#endif
 825int snd_pcm_format_width(snd_pcm_format_t format);                      /* in bits */
 826int snd_pcm_format_physical_width(snd_pcm_format_t format);             /* in bits */
 827ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
 828const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
 829int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
 830snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsignd, int big_endian);
 831
 832void snd_pcm_set_ops(struct snd_pcm * pcm, int direction, struct snd_pcm_ops *ops);
 833void snd_pcm_set_sync(struct snd_pcm_substream *substream);
 834int snd_pcm_lib_interleave_len(struct snd_pcm_substream *substream);
 835int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
 836                      unsigned int cmd, void *arg);                      
 837int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream);
 838int snd_pcm_playback_xrun_check(struct snd_pcm_substream *substream);
 839int snd_pcm_capture_xrun_check(struct snd_pcm_substream *substream);
 840int snd_pcm_playback_xrun_asap(struct snd_pcm_substream *substream);
 841int snd_pcm_capture_xrun_asap(struct snd_pcm_substream *substream);
 842void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr);
 843void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
 844snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream,
 845                                    const void __user *buf,
 846                                    snd_pcm_uframes_t frames);
 847snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream,
 848                                   void __user *buf, snd_pcm_uframes_t frames);
 849snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
 850                                     void __user **bufs, snd_pcm_uframes_t frames);
 851snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
 852                                    void __user **bufs, snd_pcm_uframes_t frames);
 853
 854extern const struct snd_pcm_hw_constraint_list snd_pcm_known_rates;
 855
 856int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime);
 857unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate);
 858
 859static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
 860                                              struct snd_dma_buffer *bufp)
 861{
 862        struct snd_pcm_runtime *runtime = substream->runtime;
 863        if (bufp) {
 864                runtime->dma_buffer_p = bufp;
 865                runtime->dma_area = bufp->area;
 866                runtime->dma_addr = bufp->addr;
 867                runtime->dma_bytes = bufp->bytes;
 868        } else {
 869                runtime->dma_buffer_p = NULL;
 870                runtime->dma_area = NULL;
 871                runtime->dma_addr = 0;
 872                runtime->dma_bytes = 0;
 873        }
 874}
 875
 876/*
 877 *  Timer interface
 878 */
 879
 880void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream);
 881void snd_pcm_timer_init(struct snd_pcm_substream *substream);
 882void snd_pcm_timer_done(struct snd_pcm_substream *substream);
 883
 884static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime,
 885                                   struct timespec *tv)
 886{
 887        if (runtime->tstamp_type == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
 888                do_posix_clock_monotonic_gettime(tv);
 889        else
 890                getnstimeofday(tv);
 891}
 892
 893/*
 894 *  Memory
 895 */
 896
 897int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
 898int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
 899int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
 900                                  int type, struct device *data,
 901                                  size_t size, size_t max);
 902int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
 903                                          int type, void *data,
 904                                          size_t size, size_t max);
 905int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
 906int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
 907
 908#ifdef CONFIG_SND_DMA_SGBUF
 909/*
 910 * SG-buffer handling
 911 */
 912#define snd_pcm_substream_sgbuf(substream) \
 913        ((substream)->runtime->dma_buffer_p->private_data)
 914
 915static inline dma_addr_t
 916snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
 917{
 918        struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream);
 919        return snd_sgbuf_get_addr(sg, ofs);
 920}
 921
 922static inline void *
 923snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
 924{
 925        struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream);
 926        return snd_sgbuf_get_ptr(sg, ofs);
 927}
 928
 929struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream,
 930                                    unsigned long offset);
 931unsigned int snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
 932                                          unsigned int ofs, unsigned int size);
 933
 934#else /* !SND_DMA_SGBUF */
 935/*
 936 * fake using a continuous buffer
 937 */
 938static inline dma_addr_t
 939snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
 940{
 941        return substream->runtime->dma_addr + ofs;
 942}
 943
 944static inline void *
 945snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
 946{
 947        return substream->runtime->dma_area + ofs;
 948}
 949
 950#define snd_pcm_sgbuf_ops_page  NULL
 951
 952#define snd_pcm_sgbuf_get_chunk_size(subs, ofs, size)   (size)
 953
 954#endif /* SND_DMA_SGBUF */
 955
 956/* handle mmap counter - PCM mmap callback should handle this counter properly */
 957static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
 958{
 959        struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
 960        atomic_inc(&substream->mmap_count);
 961}
 962
 963static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
 964{
 965        struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
 966        atomic_dec(&substream->mmap_count);
 967}
 968
 969/* mmap for io-memory area */
 970#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
 971#define SNDRV_PCM_INFO_MMAP_IOMEM       SNDRV_PCM_INFO_MMAP
 972int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
 973#else
 974#define SNDRV_PCM_INFO_MMAP_IOMEM       0
 975#define snd_pcm_lib_mmap_iomem  NULL
 976#endif
 977
 978static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
 979{
 980        *max = dma < 4 ? 64 * 1024 : 128 * 1024;
 981}
 982
 983/*
 984 *  Misc
 985 */
 986
 987#define SNDRV_PCM_DEFAULT_CON_SPDIF     (IEC958_AES0_CON_EMPHASIS_NONE|\
 988                                         (IEC958_AES1_CON_ORIGINAL<<8)|\
 989                                         (IEC958_AES1_CON_PCM_CODER<<8)|\
 990                                         (IEC958_AES3_CON_FS_48000<<24))
 991
 992#define PCM_RUNTIME_CHECK(sub) snd_BUG_ON(!(sub) || !(sub)->runtime)
 993
 994const char *snd_pcm_format_name(snd_pcm_format_t format);
 995
 996#endif /* __SOUND_PCM_H */
 997