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 <sound/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 (*wall_clock)(struct snd_pcm_substream *substream,
  75                           struct timespec *audio_ts);
  76         int (*copy)(struct snd_pcm_substream *substream, int channel,
  77                     snd_pcm_uframes_t pos,
  78                     void __user *buf, snd_pcm_uframes_t count);
  79         int (*silence)(struct snd_pcm_substream *substream, int channel,
  80                        snd_pcm_uframes_t pos, snd_pcm_uframes_t count);
  81         struct page *(*page)(struct snd_pcm_substream *substream,
  82                              unsigned long offset);
  83         int (*mmap)(struct snd_pcm_substream *substream, struct vm_area_struct *vma);
  84         int (*ack)(struct snd_pcm_substream *substream);
  85 };
  86
  87 /*
  88  *
  89  */
  90
  91 #if defined(CONFIG_SND_DYNAMIC_MINORS)
  92 #define SNDRV_PCM_DEVICES       (SNDRV_OS_MINORS-2)
  93 #else
  94 #define SNDRV_PCM_DEVICES       8
  95 #endif
  96
  97 #define SNDRV_PCM_IOCTL1_FALSE          ((void *)0)
  98 #define SNDRV_PCM_IOCTL1_TRUE           ((void *)1)
  99
 100 #define SNDRV_PCM_IOCTL1_RESET          0
 101 #define SNDRV_PCM_IOCTL1_INFO           1
 102 #define SNDRV_PCM_IOCTL1_CHANNEL_INFO   2
 103 #define SNDRV_PCM_IOCTL1_GSTATE         3
 104 #define SNDRV_PCM_IOCTL1_FIFO_SIZE      4
 105
 106 #define SNDRV_PCM_TRIGGER_STOP          0
 107 #define SNDRV_PCM_TRIGGER_START         1
 108 #define SNDRV_PCM_TRIGGER_PAUSE_PUSH    3
 109 #define SNDRV_PCM_TRIGGER_PAUSE_RELEASE 4
 110 #define SNDRV_PCM_TRIGGER_SUSPEND       5
 111 #define SNDRV_PCM_TRIGGER_RESUME        6
 112
 113 #define SNDRV_PCM_POS_XRUN              ((snd_pcm_uframes_t)-1)
 114
 115 /* If you change this don't forget to change rates[] table in pcm_native.c */
 116 #define SNDRV_PCM_RATE_5512             (1<<0)          /* 5512Hz */
 117 #define SNDRV_PCM_RATE_8000             (1<<1)          /* 8000Hz */
 118 #define SNDRV_PCM_RATE_11025            (1<<2)          /* 11025Hz */
 119 #define SNDRV_PCM_RATE_16000            (1<<3)          /* 16000Hz */
 120 #define SNDRV_PCM_RATE_22050            (1<<4)          /* 22050Hz */
 121 #define SNDRV_PCM_RATE_32000            (1<<5)          /* 32000Hz */
 122 #define SNDRV_PCM_RATE_44100            (1<<6)          /* 44100Hz */
 123 #define SNDRV_PCM_RATE_48000            (1<<7)          /* 48000Hz */
 124 #define SNDRV_PCM_RATE_64000            (1<<8)          /* 64000Hz */
 125 #define SNDRV_PCM_RATE_88200            (1<<9)          /* 88200Hz */
 126 #define SNDRV_PCM_RATE_96000            (1<<10)         /* 96000Hz */
 127 #define SNDRV_PCM_RATE_176400           (1<<11)         /* 176400Hz */
 128 #define SNDRV_PCM_RATE_192000           (1<<12)         /* 192000Hz */
 129
 130 #define SNDRV_PCM_RATE_CONTINUOUS       (1<<30)         /* continuous range */
 131 #define SNDRV_PCM_RATE_KNOT             (1<<31)         /* supports more non-continuos rates */
 132
 133 #define SNDRV_PCM_RATE_8000_44100       (SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_11025|\
 134                                          SNDRV_PCM_RATE_16000|SNDRV_PCM_RATE_22050|\
 135                                          SNDRV_PCM_RATE_32000|SNDRV_PCM_RATE_44100)
 136 #define SNDRV_PCM_RATE_8000_48000       (SNDRV_PCM_RATE_8000_44100|SNDRV_PCM_RATE_48000)
 137 #define SNDRV_PCM_RATE_8000_96000       (SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_64000|\
 138                                          SNDRV_PCM_RATE_88200|SNDRV_PCM_RATE_96000)
 139 #define SNDRV_PCM_RATE_8000_192000      (SNDRV_PCM_RATE_8000_96000|SNDRV_PCM_RATE_176400|\
 140                                          SNDRV_PCM_RATE_192000)
 141 #define _SNDRV_PCM_FMTBIT(fmt)          (1ULL << (__force int)SNDRV_PCM_FORMAT_##fmt)
 142 #define SNDRV_PCM_FMTBIT_S8             _SNDRV_PCM_FMTBIT(S8)
 143 #define SNDRV_PCM_FMTBIT_U8             _SNDRV_PCM_FMTBIT(U8)
 144 #define SNDRV_PCM_FMTBIT_S16_LE         _SNDRV_PCM_FMTBIT(S16_LE)
 145 #define SNDRV_PCM_FMTBIT_S16_BE         _SNDRV_PCM_FMTBIT(S16_BE)
 146 #define SNDRV_PCM_FMTBIT_U16_LE         _SNDRV_PCM_FMTBIT(U16_LE)
 147 #define SNDRV_PCM_FMTBIT_U16_BE         _SNDRV_PCM_FMTBIT(U16_BE)
 148 #define SNDRV_PCM_FMTBIT_S24_LE         _SNDRV_PCM_FMTBIT(S24_LE)
 149 #define SNDRV_PCM_FMTBIT_S24_BE         _SNDRV_PCM_FMTBIT(S24_BE)
 150 #define SNDRV_PCM_FMTBIT_U24_LE         _SNDRV_PCM_FMTBIT(U24_LE)
 151 #define SNDRV_PCM_FMTBIT_U24_BE         _SNDRV_PCM_FMTBIT(U24_BE)
 152 #define SNDRV_PCM_FMTBIT_S32_LE         _SNDRV_PCM_FMTBIT(S32_LE)
 153 #define SNDRV_PCM_FMTBIT_S32_BE         _SNDRV_PCM_FMTBIT(S32_BE)
 154 #define SNDRV_PCM_FMTBIT_U32_LE         _SNDRV_PCM_FMTBIT(U32_LE)
 155 #define SNDRV_PCM_FMTBIT_U32_BE         _SNDRV_PCM_FMTBIT(U32_BE)
 156 #define SNDRV_PCM_FMTBIT_FLOAT_LE       _SNDRV_PCM_FMTBIT(FLOAT_LE)
 157 #define SNDRV_PCM_FMTBIT_FLOAT_BE       _SNDRV_PCM_FMTBIT(FLOAT_BE)
 158 #define SNDRV_PCM_FMTBIT_FLOAT64_LE     _SNDRV_PCM_FMTBIT(FLOAT64_LE)
 159 #define SNDRV_PCM_FMTBIT_FLOAT64_BE     _SNDRV_PCM_FMTBIT(FLOAT64_BE)
 160 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_LE)
 161 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_BE)
 162 #define SNDRV_PCM_FMTBIT_MU_LAW         _SNDRV_PCM_FMTBIT(MU_LAW)
 163 #define SNDRV_PCM_FMTBIT_A_LAW          _SNDRV_PCM_FMTBIT(A_LAW)
 164 #define SNDRV_PCM_FMTBIT_IMA_ADPCM      _SNDRV_PCM_FMTBIT(IMA_ADPCM)
 165 #define SNDRV_PCM_FMTBIT_MPEG           _SNDRV_PCM_FMTBIT(MPEG)
 166 #define SNDRV_PCM_FMTBIT_GSM            _SNDRV_PCM_FMTBIT(GSM)
 167 #define SNDRV_PCM_FMTBIT_SPECIAL        _SNDRV_PCM_FMTBIT(SPECIAL)
 168 #define SNDRV_PCM_FMTBIT_S24_3LE        _SNDRV_PCM_FMTBIT(S24_3LE)
 169 #define SNDRV_PCM_FMTBIT_U24_3LE        _SNDRV_PCM_FMTBIT(U24_3LE)
 170 #define SNDRV_PCM_FMTBIT_S24_3BE        _SNDRV_PCM_FMTBIT(S24_3BE)
 171 #define SNDRV_PCM_FMTBIT_U24_3BE        _SNDRV_PCM_FMTBIT(U24_3BE)
 172 #define SNDRV_PCM_FMTBIT_S20_3LE        _SNDRV_PCM_FMTBIT(S20_3LE)
 173 #define SNDRV_PCM_FMTBIT_U20_3LE        _SNDRV_PCM_FMTBIT(U20_3LE)
 174 #define SNDRV_PCM_FMTBIT_S20_3BE        _SNDRV_PCM_FMTBIT(S20_3BE)
 175 #define SNDRV_PCM_FMTBIT_U20_3BE        _SNDRV_PCM_FMTBIT(U20_3BE)
 176 #define SNDRV_PCM_FMTBIT_S18_3LE        _SNDRV_PCM_FMTBIT(S18_3LE)
 177 #define SNDRV_PCM_FMTBIT_U18_3LE        _SNDRV_PCM_FMTBIT(U18_3LE)
 178 #define SNDRV_PCM_FMTBIT_S18_3BE        _SNDRV_PCM_FMTBIT(S18_3BE)
 179 #define SNDRV_PCM_FMTBIT_U18_3BE        _SNDRV_PCM_FMTBIT(U18_3BE)
 180 #define SNDRV_PCM_FMTBIT_G723_24        _SNDRV_PCM_FMTBIT(G723_24)
 181 #define SNDRV_PCM_FMTBIT_G723_24_1B     _SNDRV_PCM_FMTBIT(G723_24_1B)
 182 #define SNDRV_PCM_FMTBIT_G723_40        _SNDRV_PCM_FMTBIT(G723_40)
 183 #define SNDRV_PCM_FMTBIT_G723_40_1B     _SNDRV_PCM_FMTBIT(G723_40_1B)
 184 #define SNDRV_PCM_FMTBIT_DSD_U8         _SNDRV_PCM_FMTBIT(DSD_U8)
 185 #define SNDRV_PCM_FMTBIT_DSD_U16_LE     _SNDRV_PCM_FMTBIT(DSD_U16_LE)
 186
 187 #ifdef SNDRV_LITTLE_ENDIAN
 188 #define SNDRV_PCM_FMTBIT_S16            SNDRV_PCM_FMTBIT_S16_LE
 189 #define SNDRV_PCM_FMTBIT_U16            SNDRV_PCM_FMTBIT_U16_LE
 190 #define SNDRV_PCM_FMTBIT_S24            SNDRV_PCM_FMTBIT_S24_LE
 191 #define SNDRV_PCM_FMTBIT_U24            SNDRV_PCM_FMTBIT_U24_LE
 192 #define SNDRV_PCM_FMTBIT_S32            SNDRV_PCM_FMTBIT_S32_LE
 193 #define SNDRV_PCM_FMTBIT_U32            SNDRV_PCM_FMTBIT_U32_LE
 194 #define SNDRV_PCM_FMTBIT_FLOAT          SNDRV_PCM_FMTBIT_FLOAT_LE
 195 #define SNDRV_PCM_FMTBIT_FLOAT64        SNDRV_PCM_FMTBIT_FLOAT64_LE
 196 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE
 197 #endif
 198 #ifdef SNDRV_BIG_ENDIAN
 199 #define SNDRV_PCM_FMTBIT_S16            SNDRV_PCM_FMTBIT_S16_BE
 200 #define SNDRV_PCM_FMTBIT_U16            SNDRV_PCM_FMTBIT_U16_BE
 201 #define SNDRV_PCM_FMTBIT_S24            SNDRV_PCM_FMTBIT_S24_BE
 202 #define SNDRV_PCM_FMTBIT_U24            SNDRV_PCM_FMTBIT_U24_BE
 203 #define SNDRV_PCM_FMTBIT_S32            SNDRV_PCM_FMTBIT_S32_BE
 204 #define SNDRV_PCM_FMTBIT_U32            SNDRV_PCM_FMTBIT_U32_BE
 205 #define SNDRV_PCM_FMTBIT_FLOAT          SNDRV_PCM_FMTBIT_FLOAT_BE
 206 #define SNDRV_PCM_FMTBIT_FLOAT64        SNDRV_PCM_FMTBIT_FLOAT64_BE
 207 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE
 208 #endif
 209
 210 struct snd_pcm_file {
 211         struct snd_pcm_substream *substream;
 212         int no_compat_mmap;
 213 };
 214
 215 struct snd_pcm_hw_rule;
 216 typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params,
 217                                       struct snd_pcm_hw_rule *rule);
 218
 219 struct snd_pcm_hw_rule {
 220         unsigned int cond;
 221         snd_pcm_hw_rule_func_t func;
 222         int var;
 223         int deps[4];
 224         void *private;
 225 };
 226
 227 struct snd_pcm_hw_constraints {
 228         struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK -
 229                          SNDRV_PCM_HW_PARAM_FIRST_MASK + 1];
 230         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL -
 231                              SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
 232         unsigned int rules_num;
 233         unsigned int rules_all;
 234         struct snd_pcm_hw_rule *rules;
 235 };
 236
 237 static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs,
 238                                             snd_pcm_hw_param_t var)
 239 {
 240         return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 241 }
 242
 243 static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs,
 244                                                     snd_pcm_hw_param_t var)
 245 {
 246         return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 247 }
 248
 249 struct snd_ratnum {
 250         unsigned int num;
 251         unsigned int den_min, den_max, den_step;
 252 };
 253
 254 struct snd_ratden {
 255         unsigned int num_min, num_max, num_step;
 256         unsigned int den;
 257 };
 258
 259 struct snd_pcm_hw_constraint_ratnums {
 260         int nrats;
 261         struct snd_ratnum *rats;
 262 };
 263
 264 struct snd_pcm_hw_constraint_ratdens {
 265         int nrats;
 266         struct snd_ratden *rats;
 267 };
 268
 269 struct snd_pcm_hw_constraint_list {
 270         unsigned int count;
 271         const unsigned int *list;
 272         unsigned int mask;
 273 };
 274
 275 struct snd_pcm_hwptr_log;
 276
 277 struct snd_pcm_runtime {
 278         /* -- Status -- */
 279         struct snd_pcm_substream *trigger_master;
 280         struct timespec trigger_tstamp; /* trigger timestamp */
 281         int overrange;
 282         snd_pcm_uframes_t avail_max;
 283         snd_pcm_uframes_t hw_ptr_base;  /* Position at buffer restart */
 284         snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time */
 285         unsigned long hw_ptr_jiffies;   /* Time when hw_ptr is updated */
 286         unsigned long hw_ptr_buffer_jiffies; /* buffer time in jiffies */
 287         snd_pcm_sframes_t delay;        /* extra delay; typically FIFO size */
 288         u64 hw_ptr_wrap;                /* offset for hw_ptr due to boundary wrap-around */
 289
 290         /* -- HW params -- */
 291         snd_pcm_access_t access;        /* access mode */
 292         snd_pcm_format_t format;        /* SNDRV_PCM_FORMAT_* */
 293         snd_pcm_subformat_t subformat;  /* subformat */
 294         unsigned int rate;              /* rate in Hz */
 295         unsigned int channels;          /* channels */
 296         snd_pcm_uframes_t period_size;  /* period size */
 297         unsigned int periods;           /* periods */
 298         snd_pcm_uframes_t buffer_size;  /* buffer size */
 299         snd_pcm_uframes_t min_align;    /* Min alignment for the format */
 300         size_t byte_align;
 301         unsigned int frame_bits;
 302         unsigned int sample_bits;
 303         unsigned int info;
 304         unsigned int rate_num;
 305         unsigned int rate_den;
 306         unsigned int no_period_wakeup: 1;
 307
 308         /* -- SW params -- */
 309         int tstamp_mode;                /* mmap timestamp is updated */
 310         unsigned int period_step;
 311         snd_pcm_uframes_t start_threshold;
 312         snd_pcm_uframes_t stop_threshold;
 313         snd_pcm_uframes_t silence_threshold; /* Silence filling happens when
 314                                                 noise is nearest than this */
 315         snd_pcm_uframes_t silence_size; /* Silence filling size */
 316         snd_pcm_uframes_t boundary;     /* pointers wrap point */
 317
 318         snd_pcm_uframes_t silence_start; /* starting pointer to silence area */
 319         snd_pcm_uframes_t silence_filled; /* size filled with silence */
 320
 321         union snd_pcm_sync_id sync;     /* hardware synchronization ID */
 322
 323         /* -- mmap -- */
 324         struct snd_pcm_mmap_status *status;
 325         struct snd_pcm_mmap_control *control;
 326
 327         /* -- locking / scheduling -- */
 328         snd_pcm_uframes_t twake;        /* do transfer (!poll) wakeup if non-zero */
 329         wait_queue_head_t sleep;        /* poll sleep */
 330         wait_queue_head_t tsleep;       /* transfer sleep */
 331         struct fasync_struct *fasync;
 332
 333         /* -- private section -- */
 334         void *private_data;
 335         void (*private_free)(struct snd_pcm_runtime *runtime);
 336
 337         /* -- hardware description -- */
 338         struct snd_pcm_hardware hw;
 339         struct snd_pcm_hw_constraints hw_constraints;
 340
 341         /* -- interrupt callbacks -- */
 342         void (*transfer_ack_begin)(struct snd_pcm_substream *substream);
 343         void (*transfer_ack_end)(struct snd_pcm_substream *substream);
 344
 345         /* -- timer -- */
 346         unsigned int timer_resolution;  /* timer resolution */
 347         int tstamp_type;                /* timestamp type */
 348
 349         /* -- DMA -- */
 350         unsigned char *dma_area;        /* DMA area */
 351         dma_addr_t dma_addr;            /* physical bus address (not accessible from main CPU) */
 352         size_t dma_bytes;               /* size of DMA area */
 353
 354         struct snd_dma_buffer *dma_buffer_p;    /* allocated buffer */
 355
 356 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 357         /* -- OSS things -- */
 358         struct snd_pcm_oss_runtime oss;
 359 #endif
 360
 361 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 362         struct snd_pcm_hwptr_log *hwptr_log;
 363 #endif
 364 };
 365
 366 struct snd_pcm_group {          /* keep linked substreams */
 367         spinlock_t lock;
 368         struct list_head substreams;
 369         int count;
 370 };
 371
 372 struct pid;
 373
 374 struct snd_pcm_substream {
 375         struct snd_pcm *pcm;
 376         struct snd_pcm_str *pstr;
 377         void *private_data;             /* copied from pcm->private_data */
 378         int number;
 379         char name[32];                  /* substream name */
 380         int stream;                     /* stream (direction) */
 381         struct pm_qos_request latency_pm_qos_req; /* pm_qos request */
 382         size_t buffer_bytes_max;        /* limit ring buffer size */
 383         struct snd_dma_buffer dma_buffer;
 384         unsigned int dma_buf_id;
 385         size_t dma_max;
 386         /* -- hardware operations -- */
 387         const struct snd_pcm_ops *ops;
 388         /* -- runtime information -- */
 389         struct snd_pcm_runtime *runtime;
 390         /* -- timer section -- */
 391         struct snd_timer *timer;                /* timer */
 392         unsigned timer_running: 1;      /* time is running */
 393         /* -- next substream -- */
 394         struct snd_pcm_substream *next;
 395         /* -- linked substreams -- */
 396         struct list_head link_list;     /* linked list member */
 397         struct snd_pcm_group self_group;        /* fake group for non linked substream (with substream lock inside) */
 398         struct snd_pcm_group *group;            /* pointer to current group */
 399         /* -- assigned files -- */
 400         void *file;
 401         int ref_count;
 402         atomic_t mmap_count;
 403         unsigned int f_flags;
 404         void (*pcm_release)(struct snd_pcm_substream *);
 405         struct pid *pid;
 406 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 407         /* -- OSS things -- */
 408         struct snd_pcm_oss_substream oss;
 409 #endif
 410 #ifdef CONFIG_SND_VERBOSE_PROCFS
 411         struct snd_info_entry *proc_root;
 412         struct snd_info_entry *proc_info_entry;
 413         struct snd_info_entry *proc_hw_params_entry;
 414         struct snd_info_entry *proc_sw_params_entry;
 415         struct snd_info_entry *proc_status_entry;
 416         struct snd_info_entry *proc_prealloc_entry;
 417         struct snd_info_entry *proc_prealloc_max_entry;
 418 #endif
 419         /* misc flags */
 420         unsigned int hw_opened: 1;
 421 };
 422
 423 #define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0)
 424
 425
 426 struct snd_pcm_str {
 427         int stream;                             /* stream (direction) */
 428         struct snd_pcm *pcm;
 429         /* -- substreams -- */
 430         unsigned int substream_count;
 431         unsigned int substream_opened;
 432         struct snd_pcm_substream *substream;
 433 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 434         /* -- OSS things -- */
 435         struct snd_pcm_oss_stream oss;
 436 #endif
 437 #ifdef CONFIG_SND_VERBOSE_PROCFS
 438         struct snd_info_entry *proc_root;
 439         struct snd_info_entry *proc_info_entry;
 440 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 441         unsigned int xrun_debug;        /* 0 = disabled, 1 = verbose, 2 = stacktrace */
 442         struct snd_info_entry *proc_xrun_debug_entry;
 443 #endif
 444 #endif
 445         struct snd_kcontrol *chmap_kctl; /* channel-mapping controls */
 446 };
 447
 448 struct snd_pcm {
 449         struct snd_card *card;
 450         struct list_head list;
 451         int device; /* device number */
 452         unsigned int info_flags;
 453         unsigned short dev_class;
 454         unsigned short dev_subclass;
 455         char id[64];
 456         char name[80];
 457         struct snd_pcm_str streams[2];
 458         struct mutex open_mutex;
 459         wait_queue_head_t open_wait;
 460         void *private_data;
 461         void (*private_free) (struct snd_pcm *pcm);
 462         struct device *dev; /* actual hw device this belongs to */
 463         bool internal; /* pcm is for internal use only */
 464 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 465         struct snd_pcm_oss oss;
 466 #endif
 467 };
 468
 469 struct snd_pcm_notify {
 470         int (*n_register) (struct snd_pcm * pcm);
 471         int (*n_disconnect) (struct snd_pcm * pcm);
 472         int (*n_unregister) (struct snd_pcm * pcm);
 473         struct list_head list;
 474 };
 475
 476 /*
 477  *  Registering
 478  */
 479
 480 extern const struct file_operations snd_pcm_f_ops[2];
 481
 482 int snd_pcm_new(struct snd_card *card, const char *id, int device,
 483                 int playback_count, int capture_count,
 484                 struct snd_pcm **rpcm);
 485 int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
 486                 int playback_count, int capture_count,
 487                 struct snd_pcm **rpcm);
 488 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
 489
 490 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
 491
 492 /*
 493  *  Native I/O
 494  */
 495
 496 extern rwlock_t snd_pcm_link_rwlock;
 497
 498 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
 499 int snd_pcm_info_user(struct snd_pcm_substream *substream,
 500                       struct snd_pcm_info __user *info);
 501 int snd_pcm_status(struct snd_pcm_substream *substream,
 502                    struct snd_pcm_status *status);
 503 int snd_pcm_start(struct snd_pcm_substream *substream);
 504 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t status);
 505 int snd_pcm_drain_done(struct snd_pcm_substream *substream);
 506 #ifdef CONFIG_PM
 507 int snd_pcm_suspend(struct snd_pcm_substream *substream);
 508 int snd_pcm_suspend_all(struct snd_pcm *pcm);
 509 #endif
 510 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
 511 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
 512                            struct snd_pcm_substream **rsubstream);
 513 void snd_pcm_release_substream(struct snd_pcm_substream *substream);
 514 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
 515                              struct snd_pcm_substream **rsubstream);
 516 void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
 517 void snd_pcm_vma_notify_data(void *client, void *data);
 518 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
 519
 520
 521 #ifdef CONFIG_SND_DEBUG
 522 void snd_pcm_debug_name(struct snd_pcm_substream *substream,
 523                            char *name, size_t len);
 524 #else
 525 static inline void
 526 snd_pcm_debug_name(struct snd_pcm_substream *substream, char *buf, size_t size)
 527 {
 528         *buf = 0;
 529 }
 530 #endif
 531
 532 /*
 533  *  PCM library
 534  */
 535
 536 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
 537 {
 538         return substream->group != &substream->self_group;
 539 }
 540
 541 static inline void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
 542 {
 543         read_lock(&snd_pcm_link_rwlock);
 544         spin_lock(&substream->self_group.lock);
 545 }
 546
 547 static inline void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
 548 {
 549         spin_unlock(&substream->self_group.lock);
 550         read_unlock(&snd_pcm_link_rwlock);
 551 }
 552
 553 static inline void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
 554 {
 555         read_lock_irq(&snd_pcm_link_rwlock);
 556         spin_lock(&substream->self_group.lock);
 557 }
 558
 559 static inline void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
 560 {
 561         spin_unlock(&substream->self_group.lock);
 562         read_unlock_irq(&snd_pcm_link_rwlock);
 563 }
 564
 565 #define snd_pcm_stream_lock_irqsave(substream, flags) \
 566 do { \
 567         read_lock_irqsave(&snd_pcm_link_rwlock, (flags)); \
 568         spin_lock(&substream->self_group.lock); \
 569 } while (0)
 570
 571 #define snd_pcm_stream_unlock_irqrestore(substream, flags) \
 572 do { \
 573         spin_unlock(&substream->self_group.lock); \
 574         read_unlock_irqrestore(&snd_pcm_link_rwlock, (flags)); \
 575 } while (0)
 576
 577 #define snd_pcm_group_for_each_entry(s, substream) \
 578         list_for_each_entry(s, &substream->group->substreams, link_list)
 579
 580 static inline int snd_pcm_running(struct snd_pcm_substream *substream)
 581 {
 582         return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 583                 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
 584                  substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
 585 }
 586
 587 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
 588 {
 589         return size * 8 / runtime->sample_bits;
 590 }
 591
 592 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
 593 {
 594         return size * 8 / runtime->frame_bits;
 595 }
 596
 597 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
 598 {
 599         return size * runtime->sample_bits / 8;
 600 }
 601
 602 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
 603 {
 604         return size * runtime->frame_bits / 8;
 605 }
 606
 607 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
 608 {
 609         return bytes % runtime->byte_align == 0;
 610 }
 611
 612 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
 613 {
 614         struct snd_pcm_runtime *runtime = substream->runtime;
 615         return frames_to_bytes(runtime, runtime->buffer_size);
 616 }
 617
 618 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
 619 {
 620         struct snd_pcm_runtime *runtime = substream->runtime;
 621         return frames_to_bytes(runtime, runtime->period_size);
 622 }
 623
 624 /*
 625  *  result is: 0 ... (boundary - 1)
 626  */
 627 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
 628 {
 629         snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
 630         if (avail < 0)
 631                 avail += runtime->boundary;
 632         else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
 633                 avail -= runtime->boundary;
 634         return avail;
 635 }
 636
 637 /*
 638  *  result is: 0 ... (boundary - 1)
 639  */
 640 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
 641 {
 642         snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
 643         if (avail < 0)
 644                 avail += runtime->boundary;
 645         return avail;
 646 }
 647
 648 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
 649 {
 650         return runtime->buffer_size - snd_pcm_playback_avail(runtime);
 651 }
 652
 653 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
 654 {
 655         return runtime->buffer_size - snd_pcm_capture_avail(runtime);
 656 }
 657
 658 /**
 659  * snd_pcm_playback_ready - check whether the playback buffer is available
 660  * @substream: the pcm substream instance
 661  *
 662  * Checks whether enough free space is available on the playback buffer.
 663  *
 664  * Return: Non-zero if available, or zero if not.
 665  */
 666 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
 667 {
 668         struct snd_pcm_runtime *runtime = substream->runtime;
 669         return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
 670 }
 671
 672 /**
 673  * snd_pcm_capture_ready - check whether the capture buffer is available
 674  * @substream: the pcm substream instance
 675  *
 676  * Checks whether enough capture data is available on the capture buffer.
 677  *
 678  * Return: Non-zero if available, or zero if not.
 679  */
 680 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
 681 {
 682         struct snd_pcm_runtime *runtime = substream->runtime;
 683         return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
 684 }
 685
 686 /**
 687  * snd_pcm_playback_data - check whether any data exists on the playback buffer
 688  * @substream: the pcm substream instance
 689  *
 690  * Checks whether any data exists on the playback buffer.
 691  *
 692  * Return: Non-zero if any data exists, or zero if not. If stop_threshold
 693  * is bigger or equal to boundary, then this function returns always non-zero.
 694  */
 695 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
 696 {
 697         struct snd_pcm_runtime *runtime = substream->runtime;
 698
 699         if (runtime->stop_threshold >= runtime->boundary)
 700                 return 1;
 701         return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
 702 }
 703
 704 /**
 705  * snd_pcm_playback_empty - check whether the playback buffer is empty
 706  * @substream: the pcm substream instance
 707  *
 708  * Checks whether the playback buffer is empty.
 709  *
 710  * Return: Non-zero if empty, or zero if not.
 711  */
 712 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
 713 {
 714         struct snd_pcm_runtime *runtime = substream->runtime;
 715         return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
 716 }
 717
 718 /**
 719  * snd_pcm_capture_empty - check whether the capture buffer is empty
 720  * @substream: the pcm substream instance
 721  *
 722  * Checks whether the capture buffer is empty.
 723  *
 724  * Return: Non-zero if empty, or zero if not.
 725  */
 726 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
 727 {
 728         struct snd_pcm_runtime *runtime = substream->runtime;
 729         return snd_pcm_capture_avail(runtime) == 0;
 730 }
 731
 732 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream,
 733                                         struct snd_pcm_substream *master)
 734 {
 735         substream->runtime->trigger_master = master;
 736 }
 737
 738 static inline int hw_is_mask(int var)
 739 {
 740         return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
 741                 var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
 742 }
 743
 744 static inline int hw_is_interval(int var)
 745 {
 746         return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
 747                 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
 748 }
 749
 750 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
 751                                      snd_pcm_hw_param_t var)
 752 {
 753         return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 754 }
 755
 756 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
 757                                              snd_pcm_hw_param_t var)
 758 {
 759         return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 760 }
 761
 762 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
 763                                              snd_pcm_hw_param_t var)
 764 {
 765         return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 766 }
 767
 768 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
 769                                                      snd_pcm_hw_param_t var)
 770 {
 771         return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 772 }
 773
 774 #define params_channels(p) \
 775         (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_CHANNELS)->min)
 776 #define params_rate(p) \
 777         (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_RATE)->min)
 778 #define params_period_size(p) \
 779         (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min)
 780 #define params_periods(p) \
 781         (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_PERIODS)->min)
 782 #define params_buffer_size(p) \
 783         (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min)
 784 #define params_buffer_bytes(p) \
 785         (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min)
 786
 787 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
 788 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
 789 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
 790 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
 791                           unsigned int k, struct snd_interval *c);
 792 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
 793                           const struct snd_interval *b, struct snd_interval *c);
 794 int snd_interval_list(struct snd_interval *i, unsigned int count,
 795                       const unsigned int *list, unsigned int mask);
 796 int snd_interval_ratnum(struct snd_interval *i,
 797                         unsigned int rats_count, struct snd_ratnum *rats,
 798                         unsigned int *nump, unsigned int *denp);
 799
 800 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
 801 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
 802 int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
 803
 804 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
 805
 806 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream);
 807 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream);
 808
 809 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 810                                u_int32_t mask);
 811 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 812                                  u_int64_t mask);
 813 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 814                                  unsigned int min, unsigned int max);
 815 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
 816 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
 817                                unsigned int cond,
 818                                snd_pcm_hw_param_t var,
 819                                const struct snd_pcm_hw_constraint_list *l);
 820 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
 821                                   unsigned int cond,
 822                                   snd_pcm_hw_param_t var,
 823                                   struct snd_pcm_hw_constraint_ratnums *r);
 824 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
 825                                   unsigned int cond,
 826                                   snd_pcm_hw_param_t var,
 827                                   struct snd_pcm_hw_constraint_ratdens *r);
 828 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
 829                                  unsigned int cond,
 830                                  unsigned int width,
 831                                  unsigned int msbits);
 832 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
 833                                unsigned int cond,
 834                                snd_pcm_hw_param_t var,
 835                                unsigned long step);
 836 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
 837                                unsigned int cond,
 838                                snd_pcm_hw_param_t var);
 839 int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
 840                                unsigned int base_rate);
 841 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
 842                         unsigned int cond,
 843                         int var,
 844                         snd_pcm_hw_rule_func_t func, void *private,
 845                         int dep, ...);
 846
 847 int snd_pcm_format_signed(snd_pcm_format_t format);
 848 int snd_pcm_format_unsigned(snd_pcm_format_t format);
 849 int snd_pcm_format_linear(snd_pcm_format_t format);
 850 int snd_pcm_format_little_endian(snd_pcm_format_t format);
 851 int snd_pcm_format_big_endian(snd_pcm_format_t format);
 852 #if 0 /* just for DocBook */
 853 /**
 854  * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
 855  * @format: the format to check
 856  *
 857  * Return: 1 if the given PCM format is CPU-endian, 0 if
 858  * opposite, or a negative error code if endian not specified.
 859  */
 860 int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
 861 #endif /* DocBook */
 862 #ifdef SNDRV_LITTLE_ENDIAN
 863 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
 864 #else
 865 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
 866 #endif
 867 int snd_pcm_format_width(snd_pcm_format_t format);                      /* in bits */
 868 int snd_pcm_format_physical_width(snd_pcm_format_t format);             /* in bits */
 869 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
 870 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
 871 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
 872 snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsigned, int big_endian);
 873
 874 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction,
 875                      const struct snd_pcm_ops *ops);
 876 void snd_pcm_set_sync(struct snd_pcm_substream *substream);
 877 int snd_pcm_lib_interleave_len(struct snd_pcm_substream *substream);
 878 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
 879                       unsigned int cmd, void *arg);
 880 int snd_pcm_update_state(struct snd_pcm_substream *substream,
 881                          struct snd_pcm_runtime *runtime);
 882 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream);
 883 int snd_pcm_playback_xrun_check(struct snd_pcm_substream *substream);
 884 int snd_pcm_capture_xrun_check(struct snd_pcm_substream *substream);
 885 int snd_pcm_playback_xrun_asap(struct snd_pcm_substream *substream);
 886 int snd_pcm_capture_xrun_asap(struct snd_pcm_substream *substream);
 887 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr);
 888 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
 889 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream,
 890                                     const void __user *buf,
 891                                     snd_pcm_uframes_t frames);
 892 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream,
 893                                    void __user *buf, snd_pcm_uframes_t frames);
 894 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
 895                                      void __user **bufs, snd_pcm_uframes_t frames);
 896 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
 897                                     void __user **bufs, snd_pcm_uframes_t frames);
 898
 899 extern const struct snd_pcm_hw_constraint_list snd_pcm_known_rates;
 900
 901 int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime);
 902 unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate);
 903 unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit);
 904
 905 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
 906                                               struct snd_dma_buffer *bufp)
 907 {
 908         struct snd_pcm_runtime *runtime = substream->runtime;
 909         if (bufp) {
 910                 runtime->dma_buffer_p = bufp;
 911                 runtime->dma_area = bufp->area;
 912                 runtime->dma_addr = bufp->addr;
 913                 runtime->dma_bytes = bufp->bytes;
 914         } else {
 915                 runtime->dma_buffer_p = NULL;
 916                 runtime->dma_area = NULL;
 917                 runtime->dma_addr = 0;
 918                 runtime->dma_bytes = 0;
 919         }
 920 }
 921
 922 /*
 923  *  Timer interface
 924  */
 925
 926 void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream);
 927 void snd_pcm_timer_init(struct snd_pcm_substream *substream);
 928 void snd_pcm_timer_done(struct snd_pcm_substream *substream);
 929
 930 static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime,
 931                                    struct timespec *tv)
 932 {
 933         if (runtime->tstamp_type == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
 934                 do_posix_clock_monotonic_gettime(tv);
 935         else
 936                 getnstimeofday(tv);
 937 }
 938
 939 /*
 940  *  Memory
 941  */
 942
 943 int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
 944 int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
 945 int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
 946                                   int type, struct device *data,
 947                                   size_t size, size_t max);
 948 int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
 949                                           int type, void *data,
 950                                           size_t size, size_t max);
 951 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
 952 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
 953
 954 int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream,
 955                                       size_t size, gfp_t gfp_flags);
 956 int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream);
 957 struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream,
 958                                           unsigned long offset);
 959 #if 0 /* for kernel-doc */
 960 /**
 961  * snd_pcm_lib_alloc_vmalloc_buffer - allocate virtual DMA buffer
 962  * @substream: the substream to allocate the buffer to
 963  * @size: the requested buffer size, in bytes
 964  *
 965  * Allocates the PCM substream buffer using vmalloc(), i.e., the memory is
 966  * contiguous in kernel virtual space, but not in physical memory.  Use this
 967  * if the buffer is accessed by kernel code but not by device DMA.
 968  *
 969  * Return: 1 if the buffer was changed, 0 if not changed, or a negative error
 970  * code.
 971  */
 972 static int snd_pcm_lib_alloc_vmalloc_buffer
 973                         (struct snd_pcm_substream *substream, size_t size);
 974 /**
 975  * snd_pcm_lib_alloc_vmalloc_32_buffer - allocate 32-bit-addressable buffer
 976  * @substream: the substream to allocate the buffer to
 977  * @size: the requested buffer size, in bytes
 978  *
 979  * This function works like snd_pcm_lib_alloc_vmalloc_buffer(), but uses
 980  * vmalloc_32(), i.e., the pages are allocated from 32-bit-addressable memory.
 981  *
 982  * Return: 1 if the buffer was changed, 0 if not changed, or a negative error
 983  * code.
 984  */
 985 static int snd_pcm_lib_alloc_vmalloc_32_buffer
 986                         (struct snd_pcm_substream *substream, size_t size);
 987 #endif
 988 #define snd_pcm_lib_alloc_vmalloc_buffer(subs, size) \
 989         _snd_pcm_lib_alloc_vmalloc_buffer \
 990                         (subs, size, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO)
 991 #define snd_pcm_lib_alloc_vmalloc_32_buffer(subs, size) \
 992         _snd_pcm_lib_alloc_vmalloc_buffer \
 993                         (subs, size, GFP_KERNEL | GFP_DMA32 | __GFP_ZERO)
 994
 995 #define snd_pcm_get_dma_buf(substream) ((substream)->runtime->dma_buffer_p)
 996
 997 #ifdef CONFIG_SND_DMA_SGBUF
 998 /*
 999  * SG-buffer handling
1000  */
1001 #define snd_pcm_substream_sgbuf(substream) \
1002         snd_pcm_get_dma_buf(substream)->private_data
1003
1004 struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream,
1005                                     unsigned long offset);
1006 #else /* !SND_DMA_SGBUF */
1007 /*
1008  * fake using a continuous buffer
1009  */
1010 #define snd_pcm_sgbuf_ops_page  NULL
1011 #endif /* SND_DMA_SGBUF */
1012
1013 static inline dma_addr_t
1014 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
1015 {
1016         return snd_sgbuf_get_addr(snd_pcm_get_dma_buf(substream), ofs);
1017 }
1018
1019 static inline void *
1020 snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
1021 {
1022         return snd_sgbuf_get_ptr(snd_pcm_get_dma_buf(substream), ofs);
1023 }
1024
1025 static inline unsigned int
1026 snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
1027                              unsigned int ofs, unsigned int size)
1028 {
1029         return snd_sgbuf_get_chunk_size(snd_pcm_get_dma_buf(substream), ofs, size);
1030 }
1031
1032 /* handle mmap counter - PCM mmap callback should handle this counter properly */
1033 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
1034 {
1035         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1036         atomic_inc(&substream->mmap_count);
1037 }
1038
1039 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
1040 {
1041         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1042         atomic_dec(&substream->mmap_count);
1043 }
1044
1045 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
1046                              struct vm_area_struct *area);
1047 /* mmap for io-memory area */
1048 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
1049 #define SNDRV_PCM_INFO_MMAP_IOMEM       SNDRV_PCM_INFO_MMAP
1050 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
1051 #else
1052 #define SNDRV_PCM_INFO_MMAP_IOMEM       0
1053 #define snd_pcm_lib_mmap_iomem  NULL
1054 #endif
1055
1056 #define snd_pcm_lib_mmap_vmalloc NULL
1057
1058 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
1059 {
1060         *max = dma < 4 ? 64 * 1024 : 128 * 1024;
1061 }
1062
1063 /*
1064  *  Misc
1065  */
1066
1067 #define SNDRV_PCM_DEFAULT_CON_SPDIF     (IEC958_AES0_CON_EMPHASIS_NONE|\
1068                                          (IEC958_AES1_CON_ORIGINAL<<8)|\
1069                                          (IEC958_AES1_CON_PCM_CODER<<8)|\
1070                                          (IEC958_AES3_CON_FS_48000<<24))
1071
1072 #define PCM_RUNTIME_CHECK(sub) snd_BUG_ON(!(sub) || !(sub)->runtime)
1073
1074 const char *snd_pcm_format_name(snd_pcm_format_t format);
1075
1076 /**
1077  * snd_pcm_stream_str - Get a string naming the direction of a stream
1078  * @substream: the pcm substream instance
1079  *
1080  * Return: A string naming the direction of the stream.
1081  */
1082 static inline const char *snd_pcm_stream_str(struct snd_pcm_substream *substream)
1083 {
1084         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1085                 return "Playback";
1086         else
1087                 return "Capture";
1088 }
1089
1090 /*
1091  * PCM channel-mapping control API
1092  */
1093 /* array element of channel maps */
1094 struct snd_pcm_chmap_elem {
1095         unsigned char channels;
1096         unsigned char map[15];
1097 };
1098
1099 /* channel map information; retrieved via snd_kcontrol_chip() */
1100 struct snd_pcm_chmap {
1101         struct snd_pcm *pcm;    /* assigned PCM instance */
1102         int stream;             /* PLAYBACK or CAPTURE */
1103         struct snd_kcontrol *kctl;
1104         const struct snd_pcm_chmap_elem *chmap;
1105         unsigned int max_channels;
1106         unsigned int channel_mask;      /* optional: active channels bitmask */
1107         void *private_data;     /* optional: private data pointer */
1108 };
1109
1110 /* get the PCM substream assigned to the given chmap info */
1111 static inline struct snd_pcm_substream *
1112 snd_pcm_chmap_substream(struct snd_pcm_chmap *info, unsigned int idx)
1113 {
1114         struct snd_pcm_substream *s;
1115         for (s = info->pcm->streams[info->stream].substream; s; s = s->next)
1116                 if (s->number == idx)
1117                         return s;
1118         return NULL;
1119 }
1120
1121 /* ALSA-standard channel maps (RL/RR prior to C/LFE) */
1122 extern const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[];
1123 /* Other world's standard channel maps (C/LFE prior to RL/RR) */
1124 extern const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[];
1125
1126 /* bit masks to be passed to snd_pcm_chmap.channel_mask field */
1127 #define SND_PCM_CHMAP_MASK_24   ((1U << 2) | (1U << 4))
1128 #define SND_PCM_CHMAP_MASK_246  (SND_PCM_CHMAP_MASK_24 | (1U << 6))
1129 #define SND_PCM_CHMAP_MASK_2468 (SND_PCM_CHMAP_MASK_246 | (1U << 8))
1130
1131 int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
1132                            const struct snd_pcm_chmap_elem *chmap,
1133                            int max_channels,
1134                            unsigned long private_value,
1135                            struct snd_pcm_chmap **info_ret);
1136
1137 /* Strong-typed conversion of pcm_format to bitwise */
1138 static inline u64 pcm_format_to_bits(snd_pcm_format_t pcm_format)
1139 {
1140         return 1ULL << (__force int) pcm_format;
1141 }
1142
1143 #endif /* __SOUND_PCM_H */