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_RESET          0
  98 #define SNDRV_PCM_IOCTL1_INFO           1
  99 #define SNDRV_PCM_IOCTL1_CHANNEL_INFO   2
 100 #define SNDRV_PCM_IOCTL1_GSTATE         3
 101 #define SNDRV_PCM_IOCTL1_FIFO_SIZE      4
 102
 103 #define SNDRV_PCM_TRIGGER_STOP          0
 104 #define SNDRV_PCM_TRIGGER_START         1
 105 #define SNDRV_PCM_TRIGGER_PAUSE_PUSH    3
 106 #define SNDRV_PCM_TRIGGER_PAUSE_RELEASE 4
 107 #define SNDRV_PCM_TRIGGER_SUSPEND       5
 108 #define SNDRV_PCM_TRIGGER_RESUME        6
 109 #define SNDRV_PCM_TRIGGER_DRAIN         7
 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 #define SNDRV_PCM_FMTBIT_DSD_U8         _SNDRV_PCM_FMTBIT(DSD_U8)
 183 #define SNDRV_PCM_FMTBIT_DSD_U16_LE     _SNDRV_PCM_FMTBIT(DSD_U16_LE)
 184 #define SNDRV_PCM_FMTBIT_DSD_U32_LE     _SNDRV_PCM_FMTBIT(DSD_U32_LE)
 185 #define SNDRV_PCM_FMTBIT_DSD_U16_BE     _SNDRV_PCM_FMTBIT(DSD_U16_BE)
 186 #define SNDRV_PCM_FMTBIT_DSD_U32_BE     _SNDRV_PCM_FMTBIT(DSD_U32_BE)
 187
 188 #ifdef SNDRV_LITTLE_ENDIAN
 189 #define SNDRV_PCM_FMTBIT_S16            SNDRV_PCM_FMTBIT_S16_LE
 190 #define SNDRV_PCM_FMTBIT_U16            SNDRV_PCM_FMTBIT_U16_LE
 191 #define SNDRV_PCM_FMTBIT_S24            SNDRV_PCM_FMTBIT_S24_LE
 192 #define SNDRV_PCM_FMTBIT_U24            SNDRV_PCM_FMTBIT_U24_LE
 193 #define SNDRV_PCM_FMTBIT_S32            SNDRV_PCM_FMTBIT_S32_LE
 194 #define SNDRV_PCM_FMTBIT_U32            SNDRV_PCM_FMTBIT_U32_LE
 195 #define SNDRV_PCM_FMTBIT_FLOAT          SNDRV_PCM_FMTBIT_FLOAT_LE
 196 #define SNDRV_PCM_FMTBIT_FLOAT64        SNDRV_PCM_FMTBIT_FLOAT64_LE
 197 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE
 198 #endif
 199 #ifdef SNDRV_BIG_ENDIAN
 200 #define SNDRV_PCM_FMTBIT_S16            SNDRV_PCM_FMTBIT_S16_BE
 201 #define SNDRV_PCM_FMTBIT_U16            SNDRV_PCM_FMTBIT_U16_BE
 202 #define SNDRV_PCM_FMTBIT_S24            SNDRV_PCM_FMTBIT_S24_BE
 203 #define SNDRV_PCM_FMTBIT_U24            SNDRV_PCM_FMTBIT_U24_BE
 204 #define SNDRV_PCM_FMTBIT_S32            SNDRV_PCM_FMTBIT_S32_BE
 205 #define SNDRV_PCM_FMTBIT_U32            SNDRV_PCM_FMTBIT_U32_BE
 206 #define SNDRV_PCM_FMTBIT_FLOAT          SNDRV_PCM_FMTBIT_FLOAT_BE
 207 #define SNDRV_PCM_FMTBIT_FLOAT64        SNDRV_PCM_FMTBIT_FLOAT64_BE
 208 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE
 209 #endif
 210
 211 struct snd_pcm_file {
 212         struct snd_pcm_substream *substream;
 213         int no_compat_mmap;
 214 };
 215
 216 struct snd_pcm_hw_rule;
 217 typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params,
 218                                       struct snd_pcm_hw_rule *rule);
 219
 220 struct snd_pcm_hw_rule {
 221         unsigned int cond;
 222         snd_pcm_hw_rule_func_t func;
 223         int var;
 224         int deps[4];
 225         void *private;
 226 };
 227
 228 struct snd_pcm_hw_constraints {
 229         struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK -
 230                          SNDRV_PCM_HW_PARAM_FIRST_MASK + 1];
 231         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL -
 232                              SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
 233         unsigned int rules_num;
 234         unsigned int rules_all;
 235         struct snd_pcm_hw_rule *rules;
 236 };
 237
 238 static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs,
 239                                             snd_pcm_hw_param_t var)
 240 {
 241         return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 242 }
 243
 244 static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs,
 245                                                     snd_pcm_hw_param_t var)
 246 {
 247         return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 248 }
 249
 250 struct snd_ratnum {
 251         unsigned int num;
 252         unsigned int den_min, den_max, den_step;
 253 };
 254
 255 struct snd_ratden {
 256         unsigned int num_min, num_max, num_step;
 257         unsigned int den;
 258 };
 259
 260 struct snd_pcm_hw_constraint_ratnums {
 261         int nrats;
 262         struct snd_ratnum *rats;
 263 };
 264
 265 struct snd_pcm_hw_constraint_ratdens {
 266         int nrats;
 267         struct snd_ratden *rats;
 268 };
 269
 270 struct snd_pcm_hw_constraint_list {
 271         unsigned int count;
 272         const unsigned int *list;
 273         unsigned int mask;
 274 };
 275
 276 struct snd_pcm_hw_constraint_ranges {
 277         unsigned int count;
 278         const struct snd_interval *ranges;
 279         unsigned int mask;
 280 };
 281
 282 struct snd_pcm_hwptr_log;
 283
 284 struct snd_pcm_runtime {
 285         /* -- Status -- */
 286         struct snd_pcm_substream *trigger_master;
 287         struct timespec trigger_tstamp; /* trigger timestamp */
 288         bool trigger_tstamp_latched;     /* trigger timestamp latched in low-level driver/hardware */
 289         int overrange;
 290         snd_pcm_uframes_t avail_max;
 291         snd_pcm_uframes_t hw_ptr_base;  /* Position at buffer restart */
 292         snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time */
 293         unsigned long hw_ptr_jiffies;   /* Time when hw_ptr is updated */
 294         unsigned long hw_ptr_buffer_jiffies; /* buffer time in jiffies */
 295         snd_pcm_sframes_t delay;        /* extra delay; typically FIFO size */
 296         u64 hw_ptr_wrap;                /* offset for hw_ptr due to boundary wrap-around */
 297
 298         /* -- HW params -- */
 299         snd_pcm_access_t access;        /* access mode */
 300         snd_pcm_format_t format;        /* SNDRV_PCM_FORMAT_* */
 301         snd_pcm_subformat_t subformat;  /* subformat */
 302         unsigned int rate;              /* rate in Hz */
 303         unsigned int channels;          /* channels */
 304         snd_pcm_uframes_t period_size;  /* period size */
 305         unsigned int periods;           /* periods */
 306         snd_pcm_uframes_t buffer_size;  /* buffer size */
 307         snd_pcm_uframes_t min_align;    /* Min alignment for the format */
 308         size_t byte_align;
 309         unsigned int frame_bits;
 310         unsigned int sample_bits;
 311         unsigned int info;
 312         unsigned int rate_num;
 313         unsigned int rate_den;
 314         unsigned int no_period_wakeup: 1;
 315
 316         /* -- SW params -- */
 317         int tstamp_mode;                /* mmap timestamp is updated */
 318         unsigned int period_step;
 319         snd_pcm_uframes_t start_threshold;
 320         snd_pcm_uframes_t stop_threshold;
 321         snd_pcm_uframes_t silence_threshold; /* Silence filling happens when
 322                                                 noise is nearest than this */
 323         snd_pcm_uframes_t silence_size; /* Silence filling size */
 324         snd_pcm_uframes_t boundary;     /* pointers wrap point */
 325
 326         snd_pcm_uframes_t silence_start; /* starting pointer to silence area */
 327         snd_pcm_uframes_t silence_filled; /* size filled with silence */
 328
 329         union snd_pcm_sync_id sync;     /* hardware synchronization ID */
 330
 331         /* -- mmap -- */
 332         struct snd_pcm_mmap_status *status;
 333         struct snd_pcm_mmap_control *control;
 334
 335         /* -- locking / scheduling -- */
 336         snd_pcm_uframes_t twake;        /* do transfer (!poll) wakeup if non-zero */
 337         wait_queue_head_t sleep;        /* poll sleep */
 338         wait_queue_head_t tsleep;       /* transfer sleep */
 339         struct fasync_struct *fasync;
 340
 341         /* -- private section -- */
 342         void *private_data;
 343         void (*private_free)(struct snd_pcm_runtime *runtime);
 344
 345         /* -- hardware description -- */
 346         struct snd_pcm_hardware hw;
 347         struct snd_pcm_hw_constraints hw_constraints;
 348
 349         /* -- interrupt callbacks -- */
 350         void (*transfer_ack_begin)(struct snd_pcm_substream *substream);
 351         void (*transfer_ack_end)(struct snd_pcm_substream *substream);
 352
 353         /* -- timer -- */
 354         unsigned int timer_resolution;  /* timer resolution */
 355         int tstamp_type;                /* timestamp type */
 356
 357         /* -- DMA -- */
 358         unsigned char *dma_area;        /* DMA area */
 359         dma_addr_t dma_addr;            /* physical bus address (not accessible from main CPU) */
 360         size_t dma_bytes;               /* size of DMA area */
 361
 362         struct snd_dma_buffer *dma_buffer_p;    /* allocated buffer */
 363
 364 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 365         /* -- OSS things -- */
 366         struct snd_pcm_oss_runtime oss;
 367 #endif
 368
 369 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 370         struct snd_pcm_hwptr_log *hwptr_log;
 371 #endif
 372 };
 373
 374 struct snd_pcm_group {          /* keep linked substreams */
 375         spinlock_t lock;
 376         struct mutex mutex;
 377         struct list_head substreams;
 378         int count;
 379 };
 380
 381 struct pid;
 382
 383 struct snd_pcm_substream {
 384         struct snd_pcm *pcm;
 385         struct snd_pcm_str *pstr;
 386         void *private_data;             /* copied from pcm->private_data */
 387         int number;
 388         char name[32];                  /* substream name */
 389         int stream;                     /* stream (direction) */
 390         struct pm_qos_request latency_pm_qos_req; /* pm_qos request */
 391         size_t buffer_bytes_max;        /* limit ring buffer size */
 392         struct snd_dma_buffer dma_buffer;
 393         size_t dma_max;
 394         /* -- hardware operations -- */
 395         const struct snd_pcm_ops *ops;
 396         /* -- runtime information -- */
 397         struct snd_pcm_runtime *runtime;
 398         /* -- timer section -- */
 399         struct snd_timer *timer;                /* timer */
 400         unsigned timer_running: 1;      /* time is running */
 401         /* -- next substream -- */
 402         struct snd_pcm_substream *next;
 403         /* -- linked substreams -- */
 404         struct list_head link_list;     /* linked list member */
 405         struct snd_pcm_group self_group;        /* fake group for non linked substream (with substream lock inside) */
 406         struct snd_pcm_group *group;            /* pointer to current group */
 407         /* -- assigned files -- */
 408         void *file;
 409         int ref_count;
 410         atomic_t mmap_count;
 411         unsigned int f_flags;
 412         void (*pcm_release)(struct snd_pcm_substream *);
 413         struct pid *pid;
 414 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 415         /* -- OSS things -- */
 416         struct snd_pcm_oss_substream oss;
 417 #endif
 418 #ifdef CONFIG_SND_VERBOSE_PROCFS
 419         struct snd_info_entry *proc_root;
 420         struct snd_info_entry *proc_info_entry;
 421         struct snd_info_entry *proc_hw_params_entry;
 422         struct snd_info_entry *proc_sw_params_entry;
 423         struct snd_info_entry *proc_status_entry;
 424         struct snd_info_entry *proc_prealloc_entry;
 425         struct snd_info_entry *proc_prealloc_max_entry;
 426 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 427         struct snd_info_entry *proc_xrun_injection_entry;
 428 #endif
 429 #endif /* CONFIG_SND_VERBOSE_PROCFS */
 430         /* misc flags */
 431         unsigned int hw_opened: 1;
 432 };
 433
 434 #define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0)
 435
 436
 437 struct snd_pcm_str {
 438         int stream;                             /* stream (direction) */
 439         struct snd_pcm *pcm;
 440         /* -- substreams -- */
 441         unsigned int substream_count;
 442         unsigned int substream_opened;
 443         struct snd_pcm_substream *substream;
 444 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 445         /* -- OSS things -- */
 446         struct snd_pcm_oss_stream oss;
 447 #endif
 448 #ifdef CONFIG_SND_VERBOSE_PROCFS
 449         struct snd_info_entry *proc_root;
 450         struct snd_info_entry *proc_info_entry;
 451 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 452         unsigned int xrun_debug;        /* 0 = disabled, 1 = verbose, 2 = stacktrace */
 453         struct snd_info_entry *proc_xrun_debug_entry;
 454 #endif
 455 #endif
 456         struct snd_kcontrol *chmap_kctl; /* channel-mapping controls */
 457         struct device dev;
 458 };
 459
 460 struct snd_pcm {
 461         struct snd_card *card;
 462         struct list_head list;
 463         int device; /* device number */
 464         unsigned int info_flags;
 465         unsigned short dev_class;
 466         unsigned short dev_subclass;
 467         char id[64];
 468         char name[80];
 469         struct snd_pcm_str streams[2];
 470         struct mutex open_mutex;
 471         wait_queue_head_t open_wait;
 472         void *private_data;
 473         void (*private_free) (struct snd_pcm *pcm);
 474         bool internal; /* pcm is for internal use only */
 475         bool nonatomic; /* whole PCM operations are in non-atomic context */
 476 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 477         struct snd_pcm_oss oss;
 478 #endif
 479 };
 480
 481 struct snd_pcm_notify {
 482         int (*n_register) (struct snd_pcm * pcm);
 483         int (*n_disconnect) (struct snd_pcm * pcm);
 484         int (*n_unregister) (struct snd_pcm * pcm);
 485         struct list_head list;
 486 };
 487
 488 /*
 489  *  Registering
 490  */
 491
 492 extern const struct file_operations snd_pcm_f_ops[2];
 493
 494 int snd_pcm_new(struct snd_card *card, const char *id, int device,
 495                 int playback_count, int capture_count,
 496                 struct snd_pcm **rpcm);
 497 int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
 498                 int playback_count, int capture_count,
 499                 struct snd_pcm **rpcm);
 500 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
 501
 502 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
 503
 504 /*
 505  *  Native I/O
 506  */
 507
 508 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
 509 int snd_pcm_info_user(struct snd_pcm_substream *substream,
 510                       struct snd_pcm_info __user *info);
 511 int snd_pcm_status(struct snd_pcm_substream *substream,
 512                    struct snd_pcm_status *status);
 513 int snd_pcm_start(struct snd_pcm_substream *substream);
 514 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t status);
 515 int snd_pcm_drain_done(struct snd_pcm_substream *substream);
 516 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream);
 517 #ifdef CONFIG_PM
 518 int snd_pcm_suspend(struct snd_pcm_substream *substream);
 519 int snd_pcm_suspend_all(struct snd_pcm *pcm);
 520 #endif
 521 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
 522 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
 523                            struct snd_pcm_substream **rsubstream);
 524 void snd_pcm_release_substream(struct snd_pcm_substream *substream);
 525 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
 526                              struct snd_pcm_substream **rsubstream);
 527 void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
 528 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
 529
 530
 531 #ifdef CONFIG_SND_DEBUG
 532 void snd_pcm_debug_name(struct snd_pcm_substream *substream,
 533                            char *name, size_t len);
 534 #else
 535 static inline void
 536 snd_pcm_debug_name(struct snd_pcm_substream *substream, char *buf, size_t size)
 537 {
 538         *buf = 0;
 539 }
 540 #endif
 541
 542 /*
 543  *  PCM library
 544  */
 545
 546 /**
 547  * snd_pcm_stream_linked - Check whether the substream is linked with others
 548  * @substream: substream to check
 549  *
 550  * Returns true if the given substream is being linked with others.
 551  */
 552 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
 553 {
 554         return substream->group != &substream->self_group;
 555 }
 556
 557 void snd_pcm_stream_lock(struct snd_pcm_substream *substream);
 558 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream);
 559 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream);
 560 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream);
 561 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream);
 562
 563 /**
 564  * snd_pcm_stream_lock_irqsave - Lock the PCM stream
 565  * @substream: PCM substream
 566  * @flags: irq flags
 567  *
 568  * This locks the PCM stream like snd_pcm_stream_lock() but with the local
 569  * IRQ (only when nonatomic is false).  In nonatomic case, this is identical
 570  * as snd_pcm_stream_lock().
 571  */
 572 #define snd_pcm_stream_lock_irqsave(substream, flags)            \
 573         do {                                                     \
 574                 typecheck(unsigned long, flags);                 \
 575                 flags = _snd_pcm_stream_lock_irqsave(substream); \
 576         } while (0)
 577 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
 578                                       unsigned long flags);
 579
 580 /**
 581  * snd_pcm_group_for_each_entry - iterate over the linked substreams
 582  * @s: the iterator
 583  * @substream: the substream
 584  *
 585  * Iterate over the all linked substreams to the given @substream.
 586  * When @substream isn't linked with any others, this gives returns @substream
 587  * itself once.
 588  */
 589 #define snd_pcm_group_for_each_entry(s, substream) \
 590         list_for_each_entry(s, &substream->group->substreams, link_list)
 591
 592 /**
 593  * snd_pcm_running - Check whether the substream is in a running state
 594  * @substream: substream to check
 595  *
 596  * Returns true if the given substream is in the state RUNNING, or in the
 597  * state DRAINING for playback.
 598  */
 599 static inline int snd_pcm_running(struct snd_pcm_substream *substream)
 600 {
 601         return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 602                 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
 603                  substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
 604 }
 605
 606 /**
 607  * bytes_to_samples - Unit conversion of the size from bytes to samples
 608  * @runtime: PCM runtime instance
 609  * @size: size in bytes
 610  */
 611 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
 612 {
 613         return size * 8 / runtime->sample_bits;
 614 }
 615
 616 /**
 617  * bytes_to_frames - Unit conversion of the size from bytes to frames
 618  * @runtime: PCM runtime instance
 619  * @size: size in bytes
 620  */
 621 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
 622 {
 623         return size * 8 / runtime->frame_bits;
 624 }
 625
 626 /**
 627  * samples_to_bytes - Unit conversion of the size from samples to bytes
 628  * @runtime: PCM runtime instance
 629  * @size: size in samples
 630  */
 631 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
 632 {
 633         return size * runtime->sample_bits / 8;
 634 }
 635
 636 /**
 637  * frames_to_bytes - Unit conversion of the size from frames to bytes
 638  * @runtime: PCM runtime instance
 639  * @size: size in frames
 640  */
 641 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
 642 {
 643         return size * runtime->frame_bits / 8;
 644 }
 645
 646 /**
 647  * frame_aligned - Check whether the byte size is aligned to frames
 648  * @runtime: PCM runtime instance
 649  * @bytes: size in bytes
 650  */
 651 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
 652 {
 653         return bytes % runtime->byte_align == 0;
 654 }
 655
 656 /**
 657  * snd_pcm_lib_buffer_bytes - Get the buffer size of the current PCM in bytes
 658  * @substream: PCM substream
 659  */
 660 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
 661 {
 662         struct snd_pcm_runtime *runtime = substream->runtime;
 663         return frames_to_bytes(runtime, runtime->buffer_size);
 664 }
 665
 666 /**
 667  * snd_pcm_lib_period_bytes - Get the period size of the current PCM in bytes
 668  * @substream: PCM substream
 669  */
 670 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
 671 {
 672         struct snd_pcm_runtime *runtime = substream->runtime;
 673         return frames_to_bytes(runtime, runtime->period_size);
 674 }
 675
 676 /**
 677  * snd_pcm_playback_avail - Get the available (writable) space for playback
 678  * @runtime: PCM runtime instance
 679  *
 680  * Result is between 0 ... (boundary - 1)
 681  */
 682 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
 683 {
 684         snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
 685         if (avail < 0)
 686                 avail += runtime->boundary;
 687         else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
 688                 avail -= runtime->boundary;
 689         return avail;
 690 }
 691
 692 /**
 693  * snd_pcm_playback_avail - Get the available (readable) space for capture
 694  * @runtime: PCM runtime instance
 695  *
 696  * Result is between 0 ... (boundary - 1)
 697  */
 698 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
 699 {
 700         snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
 701         if (avail < 0)
 702                 avail += runtime->boundary;
 703         return avail;
 704 }
 705
 706 /**
 707  * snd_pcm_playback_hw_avail - Get the queued space for playback
 708  * @runtime: PCM runtime instance
 709  */
 710 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
 711 {
 712         return runtime->buffer_size - snd_pcm_playback_avail(runtime);
 713 }
 714
 715 /**
 716  * snd_pcm_capture_hw_avail - Get the free space for capture
 717  * @runtime: PCM runtime instance
 718  */
 719 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
 720 {
 721         return runtime->buffer_size - snd_pcm_capture_avail(runtime);
 722 }
 723
 724 /**
 725  * snd_pcm_playback_ready - check whether the playback buffer is available
 726  * @substream: the pcm substream instance
 727  *
 728  * Checks whether enough free space is available on the playback buffer.
 729  *
 730  * Return: Non-zero if available, or zero if not.
 731  */
 732 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
 733 {
 734         struct snd_pcm_runtime *runtime = substream->runtime;
 735         return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
 736 }
 737
 738 /**
 739  * snd_pcm_capture_ready - check whether the capture buffer is available
 740  * @substream: the pcm substream instance
 741  *
 742  * Checks whether enough capture data is available on the capture buffer.
 743  *
 744  * Return: Non-zero if available, or zero if not.
 745  */
 746 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
 747 {
 748         struct snd_pcm_runtime *runtime = substream->runtime;
 749         return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
 750 }
 751
 752 /**
 753  * snd_pcm_playback_data - check whether any data exists on the playback buffer
 754  * @substream: the pcm substream instance
 755  *
 756  * Checks whether any data exists on the playback buffer.
 757  *
 758  * Return: Non-zero if any data exists, or zero if not. If stop_threshold
 759  * is bigger or equal to boundary, then this function returns always non-zero.
 760  */
 761 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
 762 {
 763         struct snd_pcm_runtime *runtime = substream->runtime;
 764
 765         if (runtime->stop_threshold >= runtime->boundary)
 766                 return 1;
 767         return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
 768 }
 769
 770 /**
 771  * snd_pcm_playback_empty - check whether the playback buffer is empty
 772  * @substream: the pcm substream instance
 773  *
 774  * Checks whether the playback buffer is empty.
 775  *
 776  * Return: Non-zero if empty, or zero if not.
 777  */
 778 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
 779 {
 780         struct snd_pcm_runtime *runtime = substream->runtime;
 781         return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
 782 }
 783
 784 /**
 785  * snd_pcm_capture_empty - check whether the capture buffer is empty
 786  * @substream: the pcm substream instance
 787  *
 788  * Checks whether the capture buffer is empty.
 789  *
 790  * Return: Non-zero if empty, or zero if not.
 791  */
 792 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
 793 {
 794         struct snd_pcm_runtime *runtime = substream->runtime;
 795         return snd_pcm_capture_avail(runtime) == 0;
 796 }
 797
 798 /**
 799  * snd_pcm_trigger_done - Mark the master substream
 800  * @substream: the pcm substream instance
 801  * @master: the linked master substream
 802  *
 803  * When multiple substreams of the same card are linked and the hardware
 804  * supports the single-shot operation, the driver calls this in the loop
 805  * in snd_pcm_group_for_each_entry() for marking the substream as "done".
 806  * Then most of trigger operations are performed only to the given master
 807  * substream.
 808  *
 809  * The trigger_master mark is cleared at timestamp updates at the end
 810  * of trigger operations.
 811  */
 812 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream,
 813                                         struct snd_pcm_substream *master)
 814 {
 815         substream->runtime->trigger_master = master;
 816 }
 817
 818 static inline int hw_is_mask(int var)
 819 {
 820         return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
 821                 var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
 822 }
 823
 824 static inline int hw_is_interval(int var)
 825 {
 826         return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
 827                 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
 828 }
 829
 830 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
 831                                      snd_pcm_hw_param_t var)
 832 {
 833         return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 834 }
 835
 836 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
 837                                              snd_pcm_hw_param_t var)
 838 {
 839         return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 840 }
 841
 842 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
 843                                              snd_pcm_hw_param_t var)
 844 {
 845         return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 846 }
 847
 848 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
 849                                                      snd_pcm_hw_param_t var)
 850 {
 851         return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 852 }
 853
 854 /**
 855  * params_channels - Get the number of channels from the hw params
 856  * @p: hw params
 857  */
 858 static inline unsigned int params_channels(const struct snd_pcm_hw_params *p)
 859 {
 860         return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_CHANNELS)->min;
 861 }
 862
 863 /**
 864  * params_rate - Get the sample rate from the hw params
 865  * @p: hw params
 866  */
 867 static inline unsigned int params_rate(const struct snd_pcm_hw_params *p)
 868 {
 869         return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_RATE)->min;
 870 }
 871
 872 /**
 873  * params_period_size - Get the period size (in frames) from the hw params
 874  * @p: hw params
 875  */
 876 static inline unsigned int params_period_size(const struct snd_pcm_hw_params *p)
 877 {
 878         return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min;
 879 }
 880
 881 /**
 882  * params_periods - Get the number of periods from the hw params
 883  * @p: hw params
 884  */
 885 static inline unsigned int params_periods(const struct snd_pcm_hw_params *p)
 886 {
 887         return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIODS)->min;
 888 }
 889
 890 /**
 891  * params_buffer_size - Get the buffer size (in frames) from the hw params
 892  * @p: hw params
 893  */
 894 static inline unsigned int params_buffer_size(const struct snd_pcm_hw_params *p)
 895 {
 896         return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min;
 897 }
 898
 899 /**
 900  * params_buffer_bytes - Get the buffer size (in bytes) from the hw params
 901  * @p: hw params
 902  */
 903 static inline unsigned int params_buffer_bytes(const struct snd_pcm_hw_params *p)
 904 {
 905         return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min;
 906 }
 907
 908 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
 909 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
 910 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
 911 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
 912                           unsigned int k, struct snd_interval *c);
 913 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
 914                           const struct snd_interval *b, struct snd_interval *c);
 915 int snd_interval_list(struct snd_interval *i, unsigned int count,
 916                       const unsigned int *list, unsigned int mask);
 917 int snd_interval_ranges(struct snd_interval *i, unsigned int count,
 918                         const struct snd_interval *list, unsigned int mask);
 919 int snd_interval_ratnum(struct snd_interval *i,
 920                         unsigned int rats_count, struct snd_ratnum *rats,
 921                         unsigned int *nump, unsigned int *denp);
 922
 923 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
 924 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
 925 int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
 926
 927 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
 928
 929 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream);
 930 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream);
 931
 932 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 933                                u_int32_t mask);
 934 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 935                                  u_int64_t mask);
 936 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 937                                  unsigned int min, unsigned int max);
 938 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
 939 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
 940                                unsigned int cond,
 941                                snd_pcm_hw_param_t var,
 942                                const struct snd_pcm_hw_constraint_list *l);
 943 int snd_pcm_hw_constraint_ranges(struct snd_pcm_runtime *runtime,
 944                                  unsigned int cond,
 945                                  snd_pcm_hw_param_t var,
 946                                  const struct snd_pcm_hw_constraint_ranges *r);
 947 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
 948                                   unsigned int cond,
 949                                   snd_pcm_hw_param_t var,
 950                                   struct snd_pcm_hw_constraint_ratnums *r);
 951 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
 952                                   unsigned int cond,
 953                                   snd_pcm_hw_param_t var,
 954                                   struct snd_pcm_hw_constraint_ratdens *r);
 955 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
 956                                  unsigned int cond,
 957                                  unsigned int width,
 958                                  unsigned int msbits);
 959 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
 960                                unsigned int cond,
 961                                snd_pcm_hw_param_t var,
 962                                unsigned long step);
 963 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
 964                                unsigned int cond,
 965                                snd_pcm_hw_param_t var);
 966 int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
 967                                unsigned int base_rate);
 968 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
 969                         unsigned int cond,
 970                         int var,
 971                         snd_pcm_hw_rule_func_t func, void *private,
 972                         int dep, ...);
 973
 974 int snd_pcm_format_signed(snd_pcm_format_t format);
 975 int snd_pcm_format_unsigned(snd_pcm_format_t format);
 976 int snd_pcm_format_linear(snd_pcm_format_t format);
 977 int snd_pcm_format_little_endian(snd_pcm_format_t format);
 978 int snd_pcm_format_big_endian(snd_pcm_format_t format);
 979 #if 0 /* just for DocBook */
 980 /**
 981  * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
 982  * @format: the format to check
 983  *
 984  * Return: 1 if the given PCM format is CPU-endian, 0 if
 985  * opposite, or a negative error code if endian not specified.
 986  */
 987 int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
 988 #endif /* DocBook */
 989 #ifdef SNDRV_LITTLE_ENDIAN
 990 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
 991 #else
 992 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
 993 #endif
 994 int snd_pcm_format_width(snd_pcm_format_t format);                      /* in bits */
 995 int snd_pcm_format_physical_width(snd_pcm_format_t format);             /* in bits */
 996 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
 997 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
 998 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
 999
1000 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction,
1001                      const struct snd_pcm_ops *ops);
1002 void snd_pcm_set_sync(struct snd_pcm_substream *substream);
1003 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1004                       unsigned int cmd, void *arg);
1005 int snd_pcm_update_state(struct snd_pcm_substream *substream,
1006                          struct snd_pcm_runtime *runtime);
1007 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream);
1008 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr);
1009 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
1010 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream,
1011                                     const void __user *buf,
1012                                     snd_pcm_uframes_t frames);
1013 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream,
1014                                    void __user *buf, snd_pcm_uframes_t frames);
1015 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
1016                                      void __user **bufs, snd_pcm_uframes_t frames);
1017 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
1018                                     void __user **bufs, snd_pcm_uframes_t frames);
1019
1020 extern const struct snd_pcm_hw_constraint_list snd_pcm_known_rates;
1021
1022 int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime);
1023 unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate);
1024 unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit);
1025 unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a,
1026                                          unsigned int rates_b);
1027
1028 /**
1029  * snd_pcm_set_runtime_buffer - Set the PCM runtime buffer
1030  * @substream: PCM substream to set
1031  * @bufp: the buffer information, NULL to clear
1032  *
1033  * Copy the buffer information to runtime->dma_buffer when @bufp is non-NULL.
1034  * Otherwise it clears the current buffer information.
1035  */
1036 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
1037                                               struct snd_dma_buffer *bufp)
1038 {
1039         struct snd_pcm_runtime *runtime = substream->runtime;
1040         if (bufp) {
1041                 runtime->dma_buffer_p = bufp;
1042                 runtime->dma_area = bufp->area;
1043                 runtime->dma_addr = bufp->addr;
1044                 runtime->dma_bytes = bufp->bytes;
1045         } else {
1046                 runtime->dma_buffer_p = NULL;
1047                 runtime->dma_area = NULL;
1048                 runtime->dma_addr = 0;
1049                 runtime->dma_bytes = 0;
1050         }
1051 }
1052
1053 /*
1054  *  Timer interface
1055  */
1056
1057 void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream);
1058 void snd_pcm_timer_init(struct snd_pcm_substream *substream);
1059 void snd_pcm_timer_done(struct snd_pcm_substream *substream);
1060
1061 /**
1062  * snd_pcm_gettime - Fill the timespec depending on the timestamp mode
1063  * @runtime: PCM runtime instance
1064  * @tv: timespec to fill
1065  */
1066 static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime,
1067                                    struct timespec *tv)
1068 {
1069         switch (runtime->tstamp_type) {
1070         case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC:
1071                 ktime_get_ts(tv);
1072                 break;
1073         case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC_RAW:
1074                 getrawmonotonic(tv);
1075                 break;
1076         default:
1077                 getnstimeofday(tv);
1078                 break;
1079         }
1080 }
1081
1082 /*
1083  *  Memory
1084  */
1085
1086 int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
1087 int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
1088 int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
1089                                   int type, struct device *data,
1090                                   size_t size, size_t max);
1091 int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
1092                                           int type, void *data,
1093                                           size_t size, size_t max);
1094 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
1095 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
1096
1097 int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream,
1098                                       size_t size, gfp_t gfp_flags);
1099 int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream);
1100 struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream,
1101                                           unsigned long offset);
1102 /**
1103  * snd_pcm_lib_alloc_vmalloc_buffer - allocate virtual DMA buffer
1104  * @substream: the substream to allocate the buffer to
1105  * @size: the requested buffer size, in bytes
1106  *
1107  * Allocates the PCM substream buffer using vmalloc(), i.e., the memory is
1108  * contiguous in kernel virtual space, but not in physical memory.  Use this
1109  * if the buffer is accessed by kernel code but not by device DMA.
1110  *
1111  * Return: 1 if the buffer was changed, 0 if not changed, or a negative error
1112  * code.
1113  */
1114 static inline int snd_pcm_lib_alloc_vmalloc_buffer
1115                         (struct snd_pcm_substream *substream, size_t size)
1116 {
1117         return _snd_pcm_lib_alloc_vmalloc_buffer(substream, size,
1118                                                  GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
1119 }
1120
1121 /**
1122  * snd_pcm_lib_alloc_vmalloc_32_buffer - allocate 32-bit-addressable buffer
1123  * @substream: the substream to allocate the buffer to
1124  * @size: the requested buffer size, in bytes
1125  *
1126  * This function works like snd_pcm_lib_alloc_vmalloc_buffer(), but uses
1127  * vmalloc_32(), i.e., the pages are allocated from 32-bit-addressable memory.
1128  *
1129  * Return: 1 if the buffer was changed, 0 if not changed, or a negative error
1130  * code.
1131  */
1132 static inline int snd_pcm_lib_alloc_vmalloc_32_buffer
1133                         (struct snd_pcm_substream *substream, size_t size)
1134 {
1135         return _snd_pcm_lib_alloc_vmalloc_buffer(substream, size,
1136                                                  GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1137 }
1138
1139 #define snd_pcm_get_dma_buf(substream) ((substream)->runtime->dma_buffer_p)
1140
1141 #ifdef CONFIG_SND_DMA_SGBUF
1142 /*
1143  * SG-buffer handling
1144  */
1145 #define snd_pcm_substream_sgbuf(substream) \
1146         snd_pcm_get_dma_buf(substream)->private_data
1147
1148 struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream,
1149                                     unsigned long offset);
1150 #else /* !SND_DMA_SGBUF */
1151 /*
1152  * fake using a continuous buffer
1153  */
1154 #define snd_pcm_sgbuf_ops_page  NULL
1155 #endif /* SND_DMA_SGBUF */
1156
1157 /**
1158  * snd_pcm_sgbuf_get_addr - Get the DMA address at the corresponding offset
1159  * @substream: PCM substream
1160  * @ofs: byte offset
1161  */
1162 static inline dma_addr_t
1163 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
1164 {
1165         return snd_sgbuf_get_addr(snd_pcm_get_dma_buf(substream), ofs);
1166 }
1167
1168 /**
1169  * snd_pcm_sgbuf_get_ptr - Get the virtual address at the corresponding offset
1170  * @substream: PCM substream
1171  * @ofs: byte offset
1172  */
1173 static inline void *
1174 snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
1175 {
1176         return snd_sgbuf_get_ptr(snd_pcm_get_dma_buf(substream), ofs);
1177 }
1178
1179 /**
1180  * snd_pcm_sgbuf_chunk_size - Compute the max size that fits within the contig.
1181  * page from the given size
1182  * @substream: PCM substream
1183  * @ofs: byte offset
1184  * @size: byte size to examine
1185  */
1186 static inline unsigned int
1187 snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
1188                              unsigned int ofs, unsigned int size)
1189 {
1190         return snd_sgbuf_get_chunk_size(snd_pcm_get_dma_buf(substream), ofs, size);
1191 }
1192
1193 /**
1194  * snd_pcm_mmap_data_open - increase the mmap counter
1195  * @area: VMA
1196  *
1197  * PCM mmap callback should handle this counter properly
1198  */
1199 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
1200 {
1201         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1202         atomic_inc(&substream->mmap_count);
1203 }
1204
1205 /**
1206  * snd_pcm_mmap_data_close - decrease the mmap counter
1207  * @area: VMA
1208  *
1209  * PCM mmap callback should handle this counter properly
1210  */
1211 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
1212 {
1213         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1214         atomic_dec(&substream->mmap_count);
1215 }
1216
1217 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
1218                              struct vm_area_struct *area);
1219 /* mmap for io-memory area */
1220 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
1221 #define SNDRV_PCM_INFO_MMAP_IOMEM       SNDRV_PCM_INFO_MMAP
1222 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
1223 #else
1224 #define SNDRV_PCM_INFO_MMAP_IOMEM       0
1225 #define snd_pcm_lib_mmap_iomem  NULL
1226 #endif
1227
1228 #define snd_pcm_lib_mmap_vmalloc NULL
1229
1230 /**
1231  * snd_pcm_limit_isa_dma_size - Get the max size fitting with ISA DMA transfer
1232  * @dma: DMA number
1233  * @max: pointer to store the max size
1234  */
1235 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
1236 {
1237         *max = dma < 4 ? 64 * 1024 : 128 * 1024;
1238 }
1239
1240 /*
1241  *  Misc
1242  */
1243
1244 #define SNDRV_PCM_DEFAULT_CON_SPDIF     (IEC958_AES0_CON_EMPHASIS_NONE|\
1245                                          (IEC958_AES1_CON_ORIGINAL<<8)|\
1246                                          (IEC958_AES1_CON_PCM_CODER<<8)|\
1247                                          (IEC958_AES3_CON_FS_48000<<24))
1248
1249 #define PCM_RUNTIME_CHECK(sub) snd_BUG_ON(!(sub) || !(sub)->runtime)
1250
1251 const char *snd_pcm_format_name(snd_pcm_format_t format);
1252
1253 /**
1254  * snd_pcm_stream_str - Get a string naming the direction of a stream
1255  * @substream: the pcm substream instance
1256  *
1257  * Return: A string naming the direction of the stream.
1258  */
1259 static inline const char *snd_pcm_stream_str(struct snd_pcm_substream *substream)
1260 {
1261         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1262                 return "Playback";
1263         else
1264                 return "Capture";
1265 }
1266
1267 /*
1268  * PCM channel-mapping control API
1269  */
1270 /* array element of channel maps */
1271 struct snd_pcm_chmap_elem {
1272         unsigned char channels;
1273         unsigned char map[15];
1274 };
1275
1276 /* channel map information; retrieved via snd_kcontrol_chip() */
1277 struct snd_pcm_chmap {
1278         struct snd_pcm *pcm;    /* assigned PCM instance */
1279         int stream;             /* PLAYBACK or CAPTURE */
1280         struct snd_kcontrol *kctl;
1281         const struct snd_pcm_chmap_elem *chmap;
1282         unsigned int max_channels;
1283         unsigned int channel_mask;      /* optional: active channels bitmask */
1284         void *private_data;     /* optional: private data pointer */
1285 };
1286
1287 /**
1288  * snd_pcm_chmap_substream - get the PCM substream assigned to the given chmap info
1289  * @info: chmap information
1290  * @idx: the substream number index
1291  */
1292 static inline struct snd_pcm_substream *
1293 snd_pcm_chmap_substream(struct snd_pcm_chmap *info, unsigned int idx)
1294 {
1295         struct snd_pcm_substream *s;
1296         for (s = info->pcm->streams[info->stream].substream; s; s = s->next)
1297                 if (s->number == idx)
1298                         return s;
1299         return NULL;
1300 }
1301
1302 /* ALSA-standard channel maps (RL/RR prior to C/LFE) */
1303 extern const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[];
1304 /* Other world's standard channel maps (C/LFE prior to RL/RR) */
1305 extern const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[];
1306
1307 /* bit masks to be passed to snd_pcm_chmap.channel_mask field */
1308 #define SND_PCM_CHMAP_MASK_24   ((1U << 2) | (1U << 4))
1309 #define SND_PCM_CHMAP_MASK_246  (SND_PCM_CHMAP_MASK_24 | (1U << 6))
1310 #define SND_PCM_CHMAP_MASK_2468 (SND_PCM_CHMAP_MASK_246 | (1U << 8))
1311
1312 int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
1313                            const struct snd_pcm_chmap_elem *chmap,
1314                            int max_channels,
1315                            unsigned long private_value,
1316                            struct snd_pcm_chmap **info_ret);
1317
1318 /**
1319  * pcm_format_to_bits - Strong-typed conversion of pcm_format to bitwise
1320  * @pcm_format: PCM format
1321  */
1322 static inline u64 pcm_format_to_bits(snd_pcm_format_t pcm_format)
1323 {
1324         return 1ULL << (__force int) pcm_format;
1325 }
1326
1327 /* printk helpers */
1328 #define pcm_err(pcm, fmt, args...) \
1329         dev_err((pcm)->card->dev, fmt, ##args)
1330 #define pcm_warn(pcm, fmt, args...) \
1331         dev_warn((pcm)->card->dev, fmt, ##args)
1332 #define pcm_dbg(pcm, fmt, args...) \
1333         dev_dbg((pcm)->card->dev, fmt, ##args)
1334
1335 #endif /* __SOUND_PCM_H */