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 #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 "pcm_oss.h"
  39 #endif
  40
  41 /*
  42  *  Hardware (lowlevel) section
  43  */
  44
  45 struct 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
  61 struct snd_pcm_substream;
  62
  63 struct 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
 206 struct snd_pcm_file {
 207         struct snd_pcm_substream *substream;
 208         int no_compat_mmap;
 209 };
 210
 211 struct snd_pcm_hw_rule;
 212 typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params,
 213                                       struct snd_pcm_hw_rule *rule);
 214
 215 struct 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
 223 struct 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
 233 static 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
 239 static 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
 245 struct snd_ratnum {
 246         unsigned int num;
 247         unsigned int den_min, den_max, den_step;
 248 };
 249
 250 struct snd_ratden {
 251         unsigned int num_min, num_max, num_step;
 252         unsigned int den;
 253 };
 254
 255 struct snd_pcm_hw_constraint_ratnums {
 256         int nrats;
 257         struct snd_ratnum *rats;
 258 };
 259
 260 struct snd_pcm_hw_constraint_ratdens {
 261         int nrats;
 262         struct snd_ratden *rats;
 263 };
 264
 265 struct snd_pcm_hw_constraint_list {
 266         unsigned int count;
 267         unsigned int *list;
 268         unsigned int mask;
 269 };
 270
 271 struct snd_pcm_hwptr_log;
 272
 273 struct 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
 361 struct snd_pcm_group {          /* keep linked substreams */
 362         spinlock_t lock;
 363         struct list_head substreams;
 364         int count;
 365 };
 366
 367 struct pid;
 368
 369 struct 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
 421 struct 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 };
 441
 442 struct snd_pcm {
 443         struct snd_card *card;
 444         struct list_head list;
 445         int device; /* device number */
 446         unsigned int info_flags;
 447         unsigned short dev_class;
 448         unsigned short dev_subclass;
 449         char id[64];
 450         char name[80];
 451         struct snd_pcm_str streams[2];
 452         struct mutex open_mutex;
 453         wait_queue_head_t open_wait;
 454         void *private_data;
 455         void (*private_free) (struct snd_pcm *pcm);
 456         struct device *dev; /* actual hw device this belongs to */
 457 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 458         struct snd_pcm_oss oss;
 459 #endif
 460 };
 461
 462 struct snd_pcm_notify {
 463         int (*n_register) (struct snd_pcm * pcm);
 464         int (*n_disconnect) (struct snd_pcm * pcm);
 465         int (*n_unregister) (struct snd_pcm * pcm);
 466         struct list_head list;
 467 };
 468
 469 /*
 470  *  Registering
 471  */
 472
 473 extern const struct file_operations snd_pcm_f_ops[2];
 474
 475 int snd_pcm_new(struct snd_card *card, const char *id, int device,
 476                 int playback_count, int capture_count,
 477                 struct snd_pcm **rpcm);
 478 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
 479
 480 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
 481
 482 /*
 483  *  Native I/O
 484  */
 485
 486 extern rwlock_t snd_pcm_link_rwlock;
 487
 488 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
 489 int snd_pcm_info_user(struct snd_pcm_substream *substream,
 490                       struct snd_pcm_info __user *info);
 491 int snd_pcm_status(struct snd_pcm_substream *substream,
 492                    struct snd_pcm_status *status);
 493 int snd_pcm_start(struct snd_pcm_substream *substream);
 494 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t status);
 495 int snd_pcm_drain_done(struct snd_pcm_substream *substream);
 496 #ifdef CONFIG_PM
 497 int snd_pcm_suspend(struct snd_pcm_substream *substream);
 498 int snd_pcm_suspend_all(struct snd_pcm *pcm);
 499 #endif
 500 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
 501 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
 502                            struct snd_pcm_substream **rsubstream);
 503 void snd_pcm_release_substream(struct snd_pcm_substream *substream);
 504 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
 505                              struct snd_pcm_substream **rsubstream);
 506 void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
 507 void snd_pcm_vma_notify_data(void *client, void *data);
 508 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
 509
 510
 511 #ifdef CONFIG_SND_DEBUG
 512 void snd_pcm_debug_name(struct snd_pcm_substream *substream,
 513                            char *name, size_t len);
 514 #else
 515 static inline void
 516 snd_pcm_debug_name(struct snd_pcm_substream *substream, char *buf, size_t size)
 517 {
 518         *buf = 0;
 519 }
 520 #endif
 521
 522 /*
 523  *  PCM library
 524  */
 525
 526 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
 527 {
 528         return substream->group != &substream->self_group;
 529 }
 530
 531 static inline void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
 532 {
 533         read_lock(&snd_pcm_link_rwlock);
 534         spin_lock(&substream->self_group.lock);
 535 }
 536
 537 static inline void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
 538 {
 539         spin_unlock(&substream->self_group.lock);
 540         read_unlock(&snd_pcm_link_rwlock);
 541 }
 542
 543 static inline void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
 544 {
 545         read_lock_irq(&snd_pcm_link_rwlock);
 546         spin_lock(&substream->self_group.lock);
 547 }
 548
 549 static inline void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
 550 {
 551         spin_unlock(&substream->self_group.lock);
 552         read_unlock_irq(&snd_pcm_link_rwlock);
 553 }
 554
 555 #define snd_pcm_stream_lock_irqsave(substream, flags) \
 556 do { \
 557         read_lock_irqsave(&snd_pcm_link_rwlock, (flags)); \
 558         spin_lock(&substream->self_group.lock); \
 559 } while (0)
 560
 561 #define snd_pcm_stream_unlock_irqrestore(substream, flags) \
 562 do { \
 563         spin_unlock(&substream->self_group.lock); \
 564         read_unlock_irqrestore(&snd_pcm_link_rwlock, (flags)); \
 565 } while (0)
 566
 567 #define snd_pcm_group_for_each_entry(s, substream) \
 568         list_for_each_entry(s, &substream->group->substreams, link_list)
 569
 570 static inline int snd_pcm_running(struct snd_pcm_substream *substream)
 571 {
 572         return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 573                 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
 574                  substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
 575 }
 576
 577 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
 578 {
 579         return size * 8 / runtime->sample_bits;
 580 }
 581
 582 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
 583 {
 584         return size * 8 / runtime->frame_bits;
 585 }
 586
 587 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
 588 {
 589         return size * runtime->sample_bits / 8;
 590 }
 591
 592 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
 593 {
 594         return size * runtime->frame_bits / 8;
 595 }
 596
 597 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
 598 {
 599         return bytes % runtime->byte_align == 0;
 600 }
 601
 602 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
 603 {
 604         struct snd_pcm_runtime *runtime = substream->runtime;
 605         return frames_to_bytes(runtime, runtime->buffer_size);
 606 }
 607
 608 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
 609 {
 610         struct snd_pcm_runtime *runtime = substream->runtime;
 611         return frames_to_bytes(runtime, runtime->period_size);
 612 }
 613
 614 /*
 615  *  result is: 0 ... (boundary - 1)
 616  */
 617 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
 618 {
 619         snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
 620         if (avail < 0)
 621                 avail += runtime->boundary;
 622         else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
 623                 avail -= runtime->boundary;
 624         return avail;
 625 }
 626
 627 /*
 628  *  result is: 0 ... (boundary - 1)
 629  */
 630 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
 631 {
 632         snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
 633         if (avail < 0)
 634                 avail += runtime->boundary;
 635         return avail;
 636 }
 637
 638 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
 639 {
 640         return runtime->buffer_size - snd_pcm_playback_avail(runtime);
 641 }
 642
 643 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
 644 {
 645         return runtime->buffer_size - snd_pcm_capture_avail(runtime);
 646 }
 647
 648 /**
 649  * snd_pcm_playback_ready - check whether the playback buffer is available
 650  * @substream: the pcm substream instance
 651  *
 652  * Checks whether enough free space is available on the playback buffer.
 653  *
 654  * Returns non-zero if available, or zero if not.
 655  */
 656 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
 657 {
 658         struct snd_pcm_runtime *runtime = substream->runtime;
 659         return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
 660 }
 661
 662 /**
 663  * snd_pcm_capture_ready - check whether the capture buffer is available
 664  * @substream: the pcm substream instance
 665  *
 666  * Checks whether enough capture data is available on the capture buffer.
 667  *
 668  * Returns non-zero if available, or zero if not.
 669  */
 670 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
 671 {
 672         struct snd_pcm_runtime *runtime = substream->runtime;
 673         return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
 674 }
 675
 676 /**
 677  * snd_pcm_playback_data - check whether any data exists on the playback buffer
 678  * @substream: the pcm substream instance
 679  *
 680  * Checks whether any data exists on the playback buffer. If stop_threshold
 681  * is bigger or equal to boundary, then this function returns always non-zero.
 682  *
 683  * Returns non-zero if exists, or zero if not.
 684  */
 685 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
 686 {
 687         struct snd_pcm_runtime *runtime = substream->runtime;
 688
 689         if (runtime->stop_threshold >= runtime->boundary)
 690                 return 1;
 691         return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
 692 }
 693
 694 /**
 695  * snd_pcm_playback_empty - check whether the playback buffer is empty
 696  * @substream: the pcm substream instance
 697  *
 698  * Checks whether the playback buffer is empty.
 699  *
 700  * Returns non-zero if empty, or zero if not.
 701  */
 702 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
 703 {
 704         struct snd_pcm_runtime *runtime = substream->runtime;
 705         return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
 706 }
 707
 708 /**
 709  * snd_pcm_capture_empty - check whether the capture buffer is empty
 710  * @substream: the pcm substream instance
 711  *
 712  * Checks whether the capture buffer is empty.
 713  *
 714  * Returns non-zero if empty, or zero if not.
 715  */
 716 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
 717 {
 718         struct snd_pcm_runtime *runtime = substream->runtime;
 719         return snd_pcm_capture_avail(runtime) == 0;
 720 }
 721
 722 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream,
 723                                         struct snd_pcm_substream *master)
 724 {
 725         substream->runtime->trigger_master = master;
 726 }
 727
 728 static inline int hw_is_mask(int var)
 729 {
 730         return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
 731                 var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
 732 }
 733
 734 static inline int hw_is_interval(int var)
 735 {
 736         return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
 737                 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
 738 }
 739
 740 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
 741                                      snd_pcm_hw_param_t var)
 742 {
 743         return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 744 }
 745
 746 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
 747                                              snd_pcm_hw_param_t var)
 748 {
 749         return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 750 }
 751
 752 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
 753                                              snd_pcm_hw_param_t var)
 754 {
 755         return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 756 }
 757
 758 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
 759                                                      snd_pcm_hw_param_t var)
 760 {
 761         return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 762 }
 763
 764 #define params_channels(p) \
 765         (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_CHANNELS)->min)
 766 #define params_rate(p) \
 767         (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_RATE)->min)
 768 #define params_period_size(p) \
 769         (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min)
 770 #define params_periods(p) \
 771         (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_PERIODS)->min)
 772 #define params_buffer_size(p) \
 773         (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min)
 774 #define params_buffer_bytes(p) \
 775         (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min)
 776
 777 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
 778 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
 779 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
 780 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
 781                           unsigned int k, struct snd_interval *c);
 782 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
 783                           const struct snd_interval *b, struct snd_interval *c);
 784 int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask);
 785 int snd_interval_ratnum(struct snd_interval *i,
 786                         unsigned int rats_count, struct snd_ratnum *rats,
 787                         unsigned int *nump, unsigned int *denp);
 788
 789 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
 790 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
 791 int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
 792
 793 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
 794
 795 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream);
 796 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream);
 797
 798 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 799                                u_int32_t mask);
 800 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 801                                  u_int64_t mask);
 802 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 803                                  unsigned int min, unsigned int max);
 804 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
 805 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
 806                                unsigned int cond,
 807                                snd_pcm_hw_param_t var,
 808                                struct snd_pcm_hw_constraint_list *l);
 809 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
 810                                   unsigned int cond,
 811                                   snd_pcm_hw_param_t var,
 812                                   struct snd_pcm_hw_constraint_ratnums *r);
 813 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
 814                                   unsigned int cond,
 815                                   snd_pcm_hw_param_t var,
 816                                   struct snd_pcm_hw_constraint_ratdens *r);
 817 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
 818                                  unsigned int cond,
 819                                  unsigned int width,
 820                                  unsigned int msbits);
 821 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
 822                                unsigned int cond,
 823                                snd_pcm_hw_param_t var,
 824                                unsigned long step);
 825 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
 826                                unsigned int cond,
 827                                snd_pcm_hw_param_t var);
 828 int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
 829                                unsigned int base_rate);
 830 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
 831                         unsigned int cond,
 832                         int var,
 833                         snd_pcm_hw_rule_func_t func, void *private,
 834                         int dep, ...);
 835
 836 int snd_pcm_format_signed(snd_pcm_format_t format);
 837 int snd_pcm_format_unsigned(snd_pcm_format_t format);
 838 int snd_pcm_format_linear(snd_pcm_format_t format);
 839 int snd_pcm_format_little_endian(snd_pcm_format_t format);
 840 int snd_pcm_format_big_endian(snd_pcm_format_t format);
 841 #if 0 /* just for DocBook */
 842 /**
 843  * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
 844  * @format: the format to check
 845  *
 846  * Returns 1 if the given PCM format is CPU-endian, 0 if
 847  * opposite, or a negative error code if endian not specified.
 848  */
 849 int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
 850 #endif /* DocBook */
 851 #ifdef SNDRV_LITTLE_ENDIAN
 852 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
 853 #else
 854 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
 855 #endif
 856 int snd_pcm_format_width(snd_pcm_format_t format);                      /* in bits */
 857 int snd_pcm_format_physical_width(snd_pcm_format_t format);             /* in bits */
 858 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
 859 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
 860 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
 861 snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsignd, int big_endian);
 862
 863 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction, struct snd_pcm_ops *ops);
 864 void snd_pcm_set_sync(struct snd_pcm_substream *substream);
 865 int snd_pcm_lib_interleave_len(struct snd_pcm_substream *substream);
 866 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
 867                       unsigned int cmd, void *arg);
 868 int snd_pcm_update_state(struct snd_pcm_substream *substream,
 869                          struct snd_pcm_runtime *runtime);
 870 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream);
 871 int snd_pcm_playback_xrun_check(struct snd_pcm_substream *substream);
 872 int snd_pcm_capture_xrun_check(struct snd_pcm_substream *substream);
 873 int snd_pcm_playback_xrun_asap(struct snd_pcm_substream *substream);
 874 int snd_pcm_capture_xrun_asap(struct snd_pcm_substream *substream);
 875 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr);
 876 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
 877 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream,
 878                                     const void __user *buf,
 879                                     snd_pcm_uframes_t frames);
 880 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream,
 881                                    void __user *buf, snd_pcm_uframes_t frames);
 882 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
 883                                      void __user **bufs, snd_pcm_uframes_t frames);
 884 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
 885                                     void __user **bufs, snd_pcm_uframes_t frames);
 886
 887 extern const struct snd_pcm_hw_constraint_list snd_pcm_known_rates;
 888
 889 int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime);
 890 unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate);
 891
 892 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
 893                                               struct snd_dma_buffer *bufp)
 894 {
 895         struct snd_pcm_runtime *runtime = substream->runtime;
 896         if (bufp) {
 897                 runtime->dma_buffer_p = bufp;
 898                 runtime->dma_area = bufp->area;
 899                 runtime->dma_addr = bufp->addr;
 900                 runtime->dma_bytes = bufp->bytes;
 901         } else {
 902                 runtime->dma_buffer_p = NULL;
 903                 runtime->dma_area = NULL;
 904                 runtime->dma_addr = 0;
 905                 runtime->dma_bytes = 0;
 906         }
 907 }
 908
 909 /*
 910  *  Timer interface
 911  */
 912
 913 void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream);
 914 void snd_pcm_timer_init(struct snd_pcm_substream *substream);
 915 void snd_pcm_timer_done(struct snd_pcm_substream *substream);
 916
 917 static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime,
 918                                    struct timespec *tv)
 919 {
 920         if (runtime->tstamp_type == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
 921                 do_posix_clock_monotonic_gettime(tv);
 922         else
 923                 getnstimeofday(tv);
 924 }
 925
 926 /*
 927  *  Memory
 928  */
 929
 930 int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
 931 int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
 932 int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
 933                                   int type, struct device *data,
 934                                   size_t size, size_t max);
 935 int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
 936                                           int type, void *data,
 937                                           size_t size, size_t max);
 938 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
 939 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
 940
 941 int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream,
 942                                       size_t size, gfp_t gfp_flags);
 943 int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream);
 944 struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream,
 945                                           unsigned long offset);
 946 #if 0 /* for kernel-doc */
 947 /**
 948  * snd_pcm_lib_alloc_vmalloc_buffer - allocate virtual DMA buffer
 949  * @substream: the substream to allocate the buffer to
 950  * @size: the requested buffer size, in bytes
 951  *
 952  * Allocates the PCM substream buffer using vmalloc(), i.e., the memory is
 953  * contiguous in kernel virtual space, but not in physical memory.  Use this
 954  * if the buffer is accessed by kernel code but not by device DMA.
 955  *
 956  * Returns 1 if the buffer was changed, 0 if not changed, or a negative error
 957  * code.
 958  */
 959 static int snd_pcm_lib_alloc_vmalloc_buffer
 960                         (struct snd_pcm_substream *substream, size_t size);
 961 /**
 962  * snd_pcm_lib_alloc_vmalloc_32_buffer - allocate 32-bit-addressable buffer
 963  * @substream: the substream to allocate the buffer to
 964  * @size: the requested buffer size, in bytes
 965  *
 966  * This function works like snd_pcm_lib_alloc_vmalloc_buffer(), but uses
 967  * vmalloc_32(), i.e., the pages are allocated from 32-bit-addressable memory.
 968  */
 969 static int snd_pcm_lib_alloc_vmalloc_32_buffer
 970                         (struct snd_pcm_substream *substream, size_t size);
 971 #endif
 972 #define snd_pcm_lib_alloc_vmalloc_buffer(subs, size) \
 973         _snd_pcm_lib_alloc_vmalloc_buffer \
 974                         (subs, size, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO)
 975 #define snd_pcm_lib_alloc_vmalloc_32_buffer(subs, size) \
 976         _snd_pcm_lib_alloc_vmalloc_buffer \
 977                         (subs, size, GFP_KERNEL | GFP_DMA32 | __GFP_ZERO)
 978
 979 #ifdef CONFIG_SND_DMA_SGBUF
 980 /*
 981  * SG-buffer handling
 982  */
 983 #define snd_pcm_substream_sgbuf(substream) \
 984         ((substream)->runtime->dma_buffer_p->private_data)
 985
 986 static inline dma_addr_t
 987 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
 988 {
 989         struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream);
 990         return snd_sgbuf_get_addr(sg, ofs);
 991 }
 992
 993 static inline void *
 994 snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
 995 {
 996         struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream);
 997         return snd_sgbuf_get_ptr(sg, ofs);
 998 }
 999
1000 struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream,
1001                                     unsigned long offset);
1002 unsigned int snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
1003                                           unsigned int ofs, unsigned int size);
1004
1005 #else /* !SND_DMA_SGBUF */
1006 /*
1007  * fake using a continuous buffer
1008  */
1009 static inline dma_addr_t
1010 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
1011 {
1012         return substream->runtime->dma_addr + ofs;
1013 }
1014
1015 static inline void *
1016 snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
1017 {
1018         return substream->runtime->dma_area + ofs;
1019 }
1020
1021 #define snd_pcm_sgbuf_ops_page  NULL
1022
1023 #define snd_pcm_sgbuf_get_chunk_size(subs, ofs, size)   (size)
1024
1025 #endif /* SND_DMA_SGBUF */
1026
1027 /* handle mmap counter - PCM mmap callback should handle this counter properly */
1028 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
1029 {
1030         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1031         atomic_inc(&substream->mmap_count);
1032 }
1033
1034 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
1035 {
1036         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1037         atomic_dec(&substream->mmap_count);
1038 }
1039
1040 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
1041                              struct vm_area_struct *area);
1042 /* mmap for io-memory area */
1043 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
1044 #define SNDRV_PCM_INFO_MMAP_IOMEM       SNDRV_PCM_INFO_MMAP
1045 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
1046 #else
1047 #define SNDRV_PCM_INFO_MMAP_IOMEM       0
1048 #define snd_pcm_lib_mmap_iomem  NULL
1049 #endif
1050
1051 #define snd_pcm_lib_mmap_vmalloc NULL
1052
1053 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
1054 {
1055         *max = dma < 4 ? 64 * 1024 : 128 * 1024;
1056 }
1057
1058 /*
1059  *  Misc
1060  */
1061
1062 #define SNDRV_PCM_DEFAULT_CON_SPDIF     (IEC958_AES0_CON_EMPHASIS_NONE|\
1063                                          (IEC958_AES1_CON_ORIGINAL<<8)|\
1064                                          (IEC958_AES1_CON_PCM_CODER<<8)|\
1065                                          (IEC958_AES3_CON_FS_48000<<24))
1066
1067 #define PCM_RUNTIME_CHECK(sub) snd_BUG_ON(!(sub) || !(sub)->runtime)
1068
1069 const char *snd_pcm_format_name(snd_pcm_format_t format);
1070
1071 #endif /* __SOUND_PCM_H */