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 #define SNDRV_PCM_FMTBIT_DSD_U32_LE     _SNDRV_PCM_FMTBIT(DSD_U32_LE)
 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_hwptr_log;
 277
 278 struct snd_pcm_runtime {
 279         /* -- Status -- */
 280         struct snd_pcm_substream *trigger_master;
 281         struct timespec trigger_tstamp; /* trigger timestamp */
 282         int overrange;
 283         snd_pcm_uframes_t avail_max;
 284         snd_pcm_uframes_t hw_ptr_base;  /* Position at buffer restart */
 285         snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time */
 286         unsigned long hw_ptr_jiffies;   /* Time when hw_ptr is updated */
 287         unsigned long hw_ptr_buffer_jiffies; /* buffer time in jiffies */
 288         snd_pcm_sframes_t delay;        /* extra delay; typically FIFO size */
 289         u64 hw_ptr_wrap;                /* offset for hw_ptr due to boundary wrap-around */
 290
 291         /* -- HW params -- */
 292         snd_pcm_access_t access;        /* access mode */
 293         snd_pcm_format_t format;        /* SNDRV_PCM_FORMAT_* */
 294         snd_pcm_subformat_t subformat;  /* subformat */
 295         unsigned int rate;              /* rate in Hz */
 296         unsigned int channels;          /* channels */
 297         snd_pcm_uframes_t period_size;  /* period size */
 298         unsigned int periods;           /* periods */
 299         snd_pcm_uframes_t buffer_size;  /* buffer size */
 300         snd_pcm_uframes_t min_align;    /* Min alignment for the format */
 301         size_t byte_align;
 302         unsigned int frame_bits;
 303         unsigned int sample_bits;
 304         unsigned int info;
 305         unsigned int rate_num;
 306         unsigned int rate_den;
 307         unsigned int no_period_wakeup: 1;
 308
 309         /* -- SW params -- */
 310         int tstamp_mode;                /* mmap timestamp is updated */
 311         unsigned int period_step;
 312         snd_pcm_uframes_t start_threshold;
 313         snd_pcm_uframes_t stop_threshold;
 314         snd_pcm_uframes_t silence_threshold; /* Silence filling happens when
 315                                                 noise is nearest than this */
 316         snd_pcm_uframes_t silence_size; /* Silence filling size */
 317         snd_pcm_uframes_t boundary;     /* pointers wrap point */
 318
 319         snd_pcm_uframes_t silence_start; /* starting pointer to silence area */
 320         snd_pcm_uframes_t silence_filled; /* size filled with silence */
 321
 322         union snd_pcm_sync_id sync;     /* hardware synchronization ID */
 323
 324         /* -- mmap -- */
 325         struct snd_pcm_mmap_status *status;
 326         struct snd_pcm_mmap_control *control;
 327
 328         /* -- locking / scheduling -- */
 329         snd_pcm_uframes_t twake;        /* do transfer (!poll) wakeup if non-zero */
 330         wait_queue_head_t sleep;        /* poll sleep */
 331         wait_queue_head_t tsleep;       /* transfer sleep */
 332         struct fasync_struct *fasync;
 333
 334         /* -- private section -- */
 335         void *private_data;
 336         void (*private_free)(struct snd_pcm_runtime *runtime);
 337
 338         /* -- hardware description -- */
 339         struct snd_pcm_hardware hw;
 340         struct snd_pcm_hw_constraints hw_constraints;
 341
 342         /* -- interrupt callbacks -- */
 343         void (*transfer_ack_begin)(struct snd_pcm_substream *substream);
 344         void (*transfer_ack_end)(struct snd_pcm_substream *substream);
 345
 346         /* -- timer -- */
 347         unsigned int timer_resolution;  /* timer resolution */
 348         int tstamp_type;                /* timestamp type */
 349
 350         /* -- DMA -- */
 351         unsigned char *dma_area;        /* DMA area */
 352         dma_addr_t dma_addr;            /* physical bus address (not accessible from main CPU) */
 353         size_t dma_bytes;               /* size of DMA area */
 354
 355         struct snd_dma_buffer *dma_buffer_p;    /* allocated buffer */
 356
 357 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 358         /* -- OSS things -- */
 359         struct snd_pcm_oss_runtime oss;
 360 #endif
 361
 362 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 363         struct snd_pcm_hwptr_log *hwptr_log;
 364 #endif
 365 };
 366
 367 struct snd_pcm_group {          /* keep linked substreams */
 368         spinlock_t lock;
 369         struct mutex mutex;
 370         struct list_head substreams;
 371         int count;
 372 };
 373
 374 struct pid;
 375
 376 struct snd_pcm_substream {
 377         struct snd_pcm *pcm;
 378         struct snd_pcm_str *pstr;
 379         void *private_data;             /* copied from pcm->private_data */
 380         int number;
 381         char name[32];                  /* substream name */
 382         int stream;                     /* stream (direction) */
 383         struct pm_qos_request latency_pm_qos_req; /* pm_qos request */
 384         size_t buffer_bytes_max;        /* limit ring buffer size */
 385         struct snd_dma_buffer dma_buffer;
 386         size_t dma_max;
 387         /* -- hardware operations -- */
 388         const struct snd_pcm_ops *ops;
 389         /* -- runtime information -- */
 390         struct snd_pcm_runtime *runtime;
 391         /* -- timer section -- */
 392         struct snd_timer *timer;                /* timer */
 393         unsigned timer_running: 1;      /* time is running */
 394         /* -- next substream -- */
 395         struct snd_pcm_substream *next;
 396         /* -- linked substreams -- */
 397         struct list_head link_list;     /* linked list member */
 398         struct snd_pcm_group self_group;        /* fake group for non linked substream (with substream lock inside) */
 399         struct snd_pcm_group *group;            /* pointer to current group */
 400         /* -- assigned files -- */
 401         void *file;
 402         int ref_count;
 403         atomic_t mmap_count;
 404         unsigned int f_flags;
 405         void (*pcm_release)(struct snd_pcm_substream *);
 406         struct pid *pid;
 407 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 408         /* -- OSS things -- */
 409         struct snd_pcm_oss_substream oss;
 410 #endif
 411 #ifdef CONFIG_SND_VERBOSE_PROCFS
 412         struct snd_info_entry *proc_root;
 413         struct snd_info_entry *proc_info_entry;
 414         struct snd_info_entry *proc_hw_params_entry;
 415         struct snd_info_entry *proc_sw_params_entry;
 416         struct snd_info_entry *proc_status_entry;
 417         struct snd_info_entry *proc_prealloc_entry;
 418         struct snd_info_entry *proc_prealloc_max_entry;
 419 #endif
 420         /* misc flags */
 421         unsigned int hw_opened: 1;
 422 };
 423
 424 #define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0)
 425
 426
 427 struct snd_pcm_str {
 428         int stream;                             /* stream (direction) */
 429         struct snd_pcm *pcm;
 430         /* -- substreams -- */
 431         unsigned int substream_count;
 432         unsigned int substream_opened;
 433         struct snd_pcm_substream *substream;
 434 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 435         /* -- OSS things -- */
 436         struct snd_pcm_oss_stream oss;
 437 #endif
 438 #ifdef CONFIG_SND_VERBOSE_PROCFS
 439         struct snd_info_entry *proc_root;
 440         struct snd_info_entry *proc_info_entry;
 441 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 442         unsigned int xrun_debug;        /* 0 = disabled, 1 = verbose, 2 = stacktrace */
 443         struct snd_info_entry *proc_xrun_debug_entry;
 444 #endif
 445 #endif
 446         struct snd_kcontrol *chmap_kctl; /* channel-mapping controls */
 447 };
 448
 449 struct snd_pcm {
 450         struct snd_card *card;
 451         struct list_head list;
 452         int device; /* device number */
 453         unsigned int info_flags;
 454         unsigned short dev_class;
 455         unsigned short dev_subclass;
 456         char id[64];
 457         char name[80];
 458         struct snd_pcm_str streams[2];
 459         struct mutex open_mutex;
 460         wait_queue_head_t open_wait;
 461         void *private_data;
 462         void (*private_free) (struct snd_pcm *pcm);
 463         struct device *dev; /* actual hw device this belongs to */
 464         bool internal; /* pcm is for internal use only */
 465         bool nonatomic; /* whole PCM operations are in non-atomic context */
 466 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 467         struct snd_pcm_oss oss;
 468 #endif
 469 };
 470
 471 struct snd_pcm_notify {
 472         int (*n_register) (struct snd_pcm * pcm);
 473         int (*n_disconnect) (struct snd_pcm * pcm);
 474         int (*n_unregister) (struct snd_pcm * pcm);
 475         struct list_head list;
 476 };
 477
 478 /*
 479  *  Registering
 480  */
 481
 482 extern const struct file_operations snd_pcm_f_ops[2];
 483
 484 int snd_pcm_new(struct snd_card *card, const char *id, int device,
 485                 int playback_count, int capture_count,
 486                 struct snd_pcm **rpcm);
 487 int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
 488                 int playback_count, int capture_count,
 489                 struct snd_pcm **rpcm);
 490 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
 491
 492 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
 493
 494 /*
 495  *  Native I/O
 496  */
 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 void snd_pcm_stream_lock(struct snd_pcm_substream *substream);
 542 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream);
 543 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream);
 544 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream);
 545 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream);
 546 #define snd_pcm_stream_lock_irqsave(substream, flags)            \
 547         do {                                                     \
 548                 typecheck(unsigned long, flags);                 \
 549                 flags = _snd_pcm_stream_lock_irqsave(substream); \
 550         } while (0)
 551 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
 552                                       unsigned long flags);
 553
 554 #define snd_pcm_group_for_each_entry(s, substream) \
 555         list_for_each_entry(s, &substream->group->substreams, link_list)
 556
 557 static inline int snd_pcm_running(struct snd_pcm_substream *substream)
 558 {
 559         return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 560                 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
 561                  substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
 562 }
 563
 564 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
 565 {
 566         return size * 8 / runtime->sample_bits;
 567 }
 568
 569 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
 570 {
 571         return size * 8 / runtime->frame_bits;
 572 }
 573
 574 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
 575 {
 576         return size * runtime->sample_bits / 8;
 577 }
 578
 579 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
 580 {
 581         return size * runtime->frame_bits / 8;
 582 }
 583
 584 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
 585 {
 586         return bytes % runtime->byte_align == 0;
 587 }
 588
 589 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
 590 {
 591         struct snd_pcm_runtime *runtime = substream->runtime;
 592         return frames_to_bytes(runtime, runtime->buffer_size);
 593 }
 594
 595 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
 596 {
 597         struct snd_pcm_runtime *runtime = substream->runtime;
 598         return frames_to_bytes(runtime, runtime->period_size);
 599 }
 600
 601 /*
 602  *  result is: 0 ... (boundary - 1)
 603  */
 604 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
 605 {
 606         snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
 607         if (avail < 0)
 608                 avail += runtime->boundary;
 609         else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
 610                 avail -= runtime->boundary;
 611         return avail;
 612 }
 613
 614 /*
 615  *  result is: 0 ... (boundary - 1)
 616  */
 617 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
 618 {
 619         snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
 620         if (avail < 0)
 621                 avail += runtime->boundary;
 622         return avail;
 623 }
 624
 625 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
 626 {
 627         return runtime->buffer_size - snd_pcm_playback_avail(runtime);
 628 }
 629
 630 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
 631 {
 632         return runtime->buffer_size - snd_pcm_capture_avail(runtime);
 633 }
 634
 635 /**
 636  * snd_pcm_playback_ready - check whether the playback buffer is available
 637  * @substream: the pcm substream instance
 638  *
 639  * Checks whether enough free space is available on the playback buffer.
 640  *
 641  * Return: Non-zero if available, or zero if not.
 642  */
 643 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
 644 {
 645         struct snd_pcm_runtime *runtime = substream->runtime;
 646         return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
 647 }
 648
 649 /**
 650  * snd_pcm_capture_ready - check whether the capture buffer is available
 651  * @substream: the pcm substream instance
 652  *
 653  * Checks whether enough capture data is available on the capture buffer.
 654  *
 655  * Return: Non-zero if available, or zero if not.
 656  */
 657 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
 658 {
 659         struct snd_pcm_runtime *runtime = substream->runtime;
 660         return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
 661 }
 662
 663 /**
 664  * snd_pcm_playback_data - check whether any data exists on the playback buffer
 665  * @substream: the pcm substream instance
 666  *
 667  * Checks whether any data exists on the playback buffer.
 668  *
 669  * Return: Non-zero if any data exists, or zero if not. If stop_threshold
 670  * is bigger or equal to boundary, then this function returns always non-zero.
 671  */
 672 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
 673 {
 674         struct snd_pcm_runtime *runtime = substream->runtime;
 675
 676         if (runtime->stop_threshold >= runtime->boundary)
 677                 return 1;
 678         return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
 679 }
 680
 681 /**
 682  * snd_pcm_playback_empty - check whether the playback buffer is empty
 683  * @substream: the pcm substream instance
 684  *
 685  * Checks whether the playback buffer is empty.
 686  *
 687  * Return: Non-zero if empty, or zero if not.
 688  */
 689 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
 690 {
 691         struct snd_pcm_runtime *runtime = substream->runtime;
 692         return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
 693 }
 694
 695 /**
 696  * snd_pcm_capture_empty - check whether the capture buffer is empty
 697  * @substream: the pcm substream instance
 698  *
 699  * Checks whether the capture buffer is empty.
 700  *
 701  * Return: Non-zero if empty, or zero if not.
 702  */
 703 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
 704 {
 705         struct snd_pcm_runtime *runtime = substream->runtime;
 706         return snd_pcm_capture_avail(runtime) == 0;
 707 }
 708
 709 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream,
 710                                         struct snd_pcm_substream *master)
 711 {
 712         substream->runtime->trigger_master = master;
 713 }
 714
 715 static inline int hw_is_mask(int var)
 716 {
 717         return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
 718                 var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
 719 }
 720
 721 static inline int hw_is_interval(int var)
 722 {
 723         return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
 724                 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
 725 }
 726
 727 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
 728                                      snd_pcm_hw_param_t var)
 729 {
 730         return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 731 }
 732
 733 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
 734                                              snd_pcm_hw_param_t var)
 735 {
 736         return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 737 }
 738
 739 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
 740                                              snd_pcm_hw_param_t var)
 741 {
 742         return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 743 }
 744
 745 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
 746                                                      snd_pcm_hw_param_t var)
 747 {
 748         return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 749 }
 750
 751 #define params_channels(p) \
 752         (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_CHANNELS)->min)
 753 #define params_rate(p) \
 754         (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_RATE)->min)
 755 #define params_period_size(p) \
 756         (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min)
 757 #define params_periods(p) \
 758         (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_PERIODS)->min)
 759 #define params_buffer_size(p) \
 760         (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min)
 761 #define params_buffer_bytes(p) \
 762         (hw_param_interval_c((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min)
 763
 764 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
 765 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
 766 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
 767 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
 768                           unsigned int k, struct snd_interval *c);
 769 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
 770                           const struct snd_interval *b, struct snd_interval *c);
 771 int snd_interval_list(struct snd_interval *i, unsigned int count,
 772                       const unsigned int *list, unsigned int mask);
 773 int snd_interval_ratnum(struct snd_interval *i,
 774                         unsigned int rats_count, struct snd_ratnum *rats,
 775                         unsigned int *nump, unsigned int *denp);
 776
 777 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
 778 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
 779 int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
 780
 781 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
 782
 783 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream);
 784 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream);
 785
 786 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 787                                u_int32_t mask);
 788 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 789                                  u_int64_t mask);
 790 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 791                                  unsigned int min, unsigned int max);
 792 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
 793 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
 794                                unsigned int cond,
 795                                snd_pcm_hw_param_t var,
 796                                const struct snd_pcm_hw_constraint_list *l);
 797 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
 798                                   unsigned int cond,
 799                                   snd_pcm_hw_param_t var,
 800                                   struct snd_pcm_hw_constraint_ratnums *r);
 801 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
 802                                   unsigned int cond,
 803                                   snd_pcm_hw_param_t var,
 804                                   struct snd_pcm_hw_constraint_ratdens *r);
 805 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
 806                                  unsigned int cond,
 807                                  unsigned int width,
 808                                  unsigned int msbits);
 809 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
 810                                unsigned int cond,
 811                                snd_pcm_hw_param_t var,
 812                                unsigned long step);
 813 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
 814                                unsigned int cond,
 815                                snd_pcm_hw_param_t var);
 816 int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
 817                                unsigned int base_rate);
 818 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
 819                         unsigned int cond,
 820                         int var,
 821                         snd_pcm_hw_rule_func_t func, void *private,
 822                         int dep, ...);
 823
 824 int snd_pcm_format_signed(snd_pcm_format_t format);
 825 int snd_pcm_format_unsigned(snd_pcm_format_t format);
 826 int snd_pcm_format_linear(snd_pcm_format_t format);
 827 int snd_pcm_format_little_endian(snd_pcm_format_t format);
 828 int snd_pcm_format_big_endian(snd_pcm_format_t format);
 829 #if 0 /* just for DocBook */
 830 /**
 831  * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
 832  * @format: the format to check
 833  *
 834  * Return: 1 if the given PCM format is CPU-endian, 0 if
 835  * opposite, or a negative error code if endian not specified.
 836  */
 837 int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
 838 #endif /* DocBook */
 839 #ifdef SNDRV_LITTLE_ENDIAN
 840 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
 841 #else
 842 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
 843 #endif
 844 int snd_pcm_format_width(snd_pcm_format_t format);                      /* in bits */
 845 int snd_pcm_format_physical_width(snd_pcm_format_t format);             /* in bits */
 846 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
 847 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
 848 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
 849 snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsigned, int big_endian);
 850
 851 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction,
 852                      const struct snd_pcm_ops *ops);
 853 void snd_pcm_set_sync(struct snd_pcm_substream *substream);
 854 int snd_pcm_lib_interleave_len(struct snd_pcm_substream *substream);
 855 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
 856                       unsigned int cmd, void *arg);
 857 int snd_pcm_update_state(struct snd_pcm_substream *substream,
 858                          struct snd_pcm_runtime *runtime);
 859 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream);
 860 int snd_pcm_playback_xrun_check(struct snd_pcm_substream *substream);
 861 int snd_pcm_capture_xrun_check(struct snd_pcm_substream *substream);
 862 int snd_pcm_playback_xrun_asap(struct snd_pcm_substream *substream);
 863 int snd_pcm_capture_xrun_asap(struct snd_pcm_substream *substream);
 864 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr);
 865 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
 866 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream,
 867                                     const void __user *buf,
 868                                     snd_pcm_uframes_t frames);
 869 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream,
 870                                    void __user *buf, snd_pcm_uframes_t frames);
 871 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
 872                                      void __user **bufs, snd_pcm_uframes_t frames);
 873 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
 874                                     void __user **bufs, snd_pcm_uframes_t frames);
 875
 876 extern const struct snd_pcm_hw_constraint_list snd_pcm_known_rates;
 877
 878 int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime);
 879 unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate);
 880 unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit);
 881 unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a,
 882                                          unsigned int rates_b);
 883
 884 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
 885                                               struct snd_dma_buffer *bufp)
 886 {
 887         struct snd_pcm_runtime *runtime = substream->runtime;
 888         if (bufp) {
 889                 runtime->dma_buffer_p = bufp;
 890                 runtime->dma_area = bufp->area;
 891                 runtime->dma_addr = bufp->addr;
 892                 runtime->dma_bytes = bufp->bytes;
 893         } else {
 894                 runtime->dma_buffer_p = NULL;
 895                 runtime->dma_area = NULL;
 896                 runtime->dma_addr = 0;
 897                 runtime->dma_bytes = 0;
 898         }
 899 }
 900
 901 /*
 902  *  Timer interface
 903  */
 904
 905 void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream);
 906 void snd_pcm_timer_init(struct snd_pcm_substream *substream);
 907 void snd_pcm_timer_done(struct snd_pcm_substream *substream);
 908
 909 static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime,
 910                                    struct timespec *tv)
 911 {
 912         switch (runtime->tstamp_type) {
 913         case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC:
 914                 ktime_get_ts(tv);
 915                 break;
 916         case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC_RAW:
 917                 getrawmonotonic(tv);
 918                 break;
 919         default:
 920                 getnstimeofday(tv);
 921                 break;
 922         }
 923 }
 924
 925 /*
 926  *  Memory
 927  */
 928
 929 int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
 930 int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
 931 int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
 932                                   int type, struct device *data,
 933                                   size_t size, size_t max);
 934 int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
 935                                           int type, void *data,
 936                                           size_t size, size_t max);
 937 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
 938 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
 939
 940 int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream,
 941                                       size_t size, gfp_t gfp_flags);
 942 int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream);
 943 struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream,
 944                                           unsigned long offset);
 945 #if 0 /* for kernel-doc */
 946 /**
 947  * snd_pcm_lib_alloc_vmalloc_buffer - allocate virtual DMA buffer
 948  * @substream: the substream to allocate the buffer to
 949  * @size: the requested buffer size, in bytes
 950  *
 951  * Allocates the PCM substream buffer using vmalloc(), i.e., the memory is
 952  * contiguous in kernel virtual space, but not in physical memory.  Use this
 953  * if the buffer is accessed by kernel code but not by device DMA.
 954  *
 955  * Return: 1 if the buffer was changed, 0 if not changed, or a negative error
 956  * code.
 957  */
 958 static int snd_pcm_lib_alloc_vmalloc_buffer
 959                         (struct snd_pcm_substream *substream, size_t size);
 960 /**
 961  * snd_pcm_lib_alloc_vmalloc_32_buffer - allocate 32-bit-addressable buffer
 962  * @substream: the substream to allocate the buffer to
 963  * @size: the requested buffer size, in bytes
 964  *
 965  * This function works like snd_pcm_lib_alloc_vmalloc_buffer(), but uses
 966  * vmalloc_32(), i.e., the pages are allocated from 32-bit-addressable memory.
 967  *
 968  * Return: 1 if the buffer was changed, 0 if not changed, or a negative error
 969  * code.
 970  */
 971 static int snd_pcm_lib_alloc_vmalloc_32_buffer
 972                         (struct snd_pcm_substream *substream, size_t size);
 973 #endif
 974 #define snd_pcm_lib_alloc_vmalloc_buffer(subs, size) \
 975         _snd_pcm_lib_alloc_vmalloc_buffer \
 976                         (subs, size, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO)
 977 #define snd_pcm_lib_alloc_vmalloc_32_buffer(subs, size) \
 978         _snd_pcm_lib_alloc_vmalloc_buffer \
 979                         (subs, size, GFP_KERNEL | GFP_DMA32 | __GFP_ZERO)
 980
 981 #define snd_pcm_get_dma_buf(substream) ((substream)->runtime->dma_buffer_p)
 982
 983 #ifdef CONFIG_SND_DMA_SGBUF
 984 /*
 985  * SG-buffer handling
 986  */
 987 #define snd_pcm_substream_sgbuf(substream) \
 988         snd_pcm_get_dma_buf(substream)->private_data
 989
 990 struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream,
 991                                     unsigned long offset);
 992 #else /* !SND_DMA_SGBUF */
 993 /*
 994  * fake using a continuous buffer
 995  */
 996 #define snd_pcm_sgbuf_ops_page  NULL
 997 #endif /* SND_DMA_SGBUF */
 998
 999 static inline dma_addr_t
1000 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
1001 {
1002         return snd_sgbuf_get_addr(snd_pcm_get_dma_buf(substream), ofs);
1003 }
1004
1005 static inline void *
1006 snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
1007 {
1008         return snd_sgbuf_get_ptr(snd_pcm_get_dma_buf(substream), ofs);
1009 }
1010
1011 static inline unsigned int
1012 snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
1013                              unsigned int ofs, unsigned int size)
1014 {
1015         return snd_sgbuf_get_chunk_size(snd_pcm_get_dma_buf(substream), ofs, size);
1016 }
1017
1018 /* handle mmap counter - PCM mmap callback should handle this counter properly */
1019 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
1020 {
1021         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1022         atomic_inc(&substream->mmap_count);
1023 }
1024
1025 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
1026 {
1027         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1028         atomic_dec(&substream->mmap_count);
1029 }
1030
1031 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
1032                              struct vm_area_struct *area);
1033 /* mmap for io-memory area */
1034 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
1035 #define SNDRV_PCM_INFO_MMAP_IOMEM       SNDRV_PCM_INFO_MMAP
1036 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
1037 #else
1038 #define SNDRV_PCM_INFO_MMAP_IOMEM       0
1039 #define snd_pcm_lib_mmap_iomem  NULL
1040 #endif
1041
1042 #define snd_pcm_lib_mmap_vmalloc NULL
1043
1044 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
1045 {
1046         *max = dma < 4 ? 64 * 1024 : 128 * 1024;
1047 }
1048
1049 /*
1050  *  Misc
1051  */
1052
1053 #define SNDRV_PCM_DEFAULT_CON_SPDIF     (IEC958_AES0_CON_EMPHASIS_NONE|\
1054                                          (IEC958_AES1_CON_ORIGINAL<<8)|\
1055                                          (IEC958_AES1_CON_PCM_CODER<<8)|\
1056                                          (IEC958_AES3_CON_FS_48000<<24))
1057
1058 #define PCM_RUNTIME_CHECK(sub) snd_BUG_ON(!(sub) || !(sub)->runtime)
1059
1060 const char *snd_pcm_format_name(snd_pcm_format_t format);
1061
1062 /**
1063  * snd_pcm_stream_str - Get a string naming the direction of a stream
1064  * @substream: the pcm substream instance
1065  *
1066  * Return: A string naming the direction of the stream.
1067  */
1068 static inline const char *snd_pcm_stream_str(struct snd_pcm_substream *substream)
1069 {
1070         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1071                 return "Playback";
1072         else
1073                 return "Capture";
1074 }
1075
1076 /*
1077  * PCM channel-mapping control API
1078  */
1079 /* array element of channel maps */
1080 struct snd_pcm_chmap_elem {
1081         unsigned char channels;
1082         unsigned char map[15];
1083 };
1084
1085 /* channel map information; retrieved via snd_kcontrol_chip() */
1086 struct snd_pcm_chmap {
1087         struct snd_pcm *pcm;    /* assigned PCM instance */
1088         int stream;             /* PLAYBACK or CAPTURE */
1089         struct snd_kcontrol *kctl;
1090         const struct snd_pcm_chmap_elem *chmap;
1091         unsigned int max_channels;
1092         unsigned int channel_mask;      /* optional: active channels bitmask */
1093         void *private_data;     /* optional: private data pointer */
1094 };
1095
1096 /* get the PCM substream assigned to the given chmap info */
1097 static inline struct snd_pcm_substream *
1098 snd_pcm_chmap_substream(struct snd_pcm_chmap *info, unsigned int idx)
1099 {
1100         struct snd_pcm_substream *s;
1101         for (s = info->pcm->streams[info->stream].substream; s; s = s->next)
1102                 if (s->number == idx)
1103                         return s;
1104         return NULL;
1105 }
1106
1107 /* ALSA-standard channel maps (RL/RR prior to C/LFE) */
1108 extern const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[];
1109 /* Other world's standard channel maps (C/LFE prior to RL/RR) */
1110 extern const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[];
1111
1112 /* bit masks to be passed to snd_pcm_chmap.channel_mask field */
1113 #define SND_PCM_CHMAP_MASK_24   ((1U << 2) | (1U << 4))
1114 #define SND_PCM_CHMAP_MASK_246  (SND_PCM_CHMAP_MASK_24 | (1U << 6))
1115 #define SND_PCM_CHMAP_MASK_2468 (SND_PCM_CHMAP_MASK_246 | (1U << 8))
1116
1117 int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
1118                            const struct snd_pcm_chmap_elem *chmap,
1119                            int max_channels,
1120                            unsigned long private_value,
1121                            struct snd_pcm_chmap **info_ret);
1122
1123 /* Strong-typed conversion of pcm_format to bitwise */
1124 static inline u64 pcm_format_to_bits(snd_pcm_format_t pcm_format)
1125 {
1126         return 1ULL << (__force int) pcm_format;
1127 }
1128
1129 /* printk helpers */
1130 #define pcm_err(pcm, fmt, args...) \
1131         dev_err((pcm)->card->dev, fmt, ##args)
1132 #define pcm_warn(pcm, fmt, args...) \
1133         dev_warn((pcm)->card->dev, fmt, ##args)
1134 #define pcm_dbg(pcm, fmt, args...) \
1135         dev_dbg((pcm)->card->dev, fmt, ##args)
1136
1137 #endif /* __SOUND_PCM_H */