include/sound/pcm.h

   1 #ifndef __SOUND_PCM_H
   2 #define __SOUND_PCM_H
   3
   4 /*
   5  *  Digital Audio (PCM) abstract layer
   6  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   7  *                   Abramo Bagnara <abramo@alsa-project.org>
   8  *
   9  *
  10  *   This program is free software; you can redistribute it and/or modify
  11  *   it under the terms of the GNU General Public License as published by
  12  *   the Free Software Foundation; either version 2 of the License, or
  13  *   (at your option) any later version.
  14  *
  15  *   This program is distributed in the hope that it will be useful,
  16  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *   GNU General Public License for more details.
  19  *
  20  *   You should have received a copy of the GNU General Public License
  21  *   along with this program; if not, write to the Free Software
  22  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  23  *
  24  */
  25
  26 #include <sound/asound.h>
  27 #include <sound/memalloc.h>
  28 #include <sound/minors.h>
  29 #include <linux/poll.h>
  30 #include <linux/mm.h>
  31 #include <linux/bitops.h>
  32
  33 #define snd_pcm_substream_chip(substream) ((substream)->private_data)
  34 #define snd_pcm_chip(pcm) ((pcm)->private_data)
  35
  36 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
  37 #include "pcm_oss.h"
  38 #endif
  39
  40 /*
  41  *  Hardware (lowlevel) section
  42  */
  43
  44 struct snd_pcm_hardware {
  45         unsigned int info;              /* SNDRV_PCM_INFO_* */
  46         u64 formats;                    /* SNDRV_PCM_FMTBIT_* */
  47         unsigned int rates;             /* SNDRV_PCM_RATE_* */
  48         unsigned int rate_min;          /* min rate */
  49         unsigned int rate_max;          /* max rate */
  50         unsigned int channels_min;      /* min channels */
  51         unsigned int channels_max;      /* max channels */
  52         size_t buffer_bytes_max;        /* max buffer size */
  53         size_t period_bytes_min;        /* min period size */
  54         size_t period_bytes_max;        /* max period size */
  55         unsigned int periods_min;       /* min # of periods */
  56         unsigned int periods_max;       /* max # of periods */
  57         size_t fifo_size;               /* fifo size in bytes */
  58 };
  59
  60 struct snd_pcm_substream;
  61
  62 struct snd_pcm_ops {
  63         int (*open)(struct snd_pcm_substream *substream);
  64         int (*close)(struct snd_pcm_substream *substream);
  65         int (*ioctl)(struct snd_pcm_substream * substream,
  66                      unsigned int cmd, void *arg);
  67         int (*hw_params)(struct snd_pcm_substream *substream,
  68                          struct snd_pcm_hw_params *params);
  69         int (*hw_free)(struct snd_pcm_substream *substream);
  70         int (*prepare)(struct snd_pcm_substream *substream);
  71         int (*trigger)(struct snd_pcm_substream *substream, int cmd);
  72         snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *substream);
  73         int (*copy)(struct snd_pcm_substream *substream, int channel,
  74                     snd_pcm_uframes_t pos,
  75                     void __user *buf, snd_pcm_uframes_t count);
  76         int (*silence)(struct snd_pcm_substream *substream, int channel,
  77                        snd_pcm_uframes_t pos, snd_pcm_uframes_t count);
  78         struct page *(*page)(struct snd_pcm_substream *substream,
  79                              unsigned long offset);
  80         int (*mmap)(struct snd_pcm_substream *substream, struct vm_area_struct *vma);
  81         int (*ack)(struct snd_pcm_substream *substream);
  82 };
  83
  84 /*
  85  *
  86  */
  87
  88 #if defined(CONFIG_SND_DYNAMIC_MINORS)
  89 #define SNDRV_PCM_DEVICES       (SNDRV_OS_MINORS-2)
  90 #else
  91 #define SNDRV_PCM_DEVICES       8
  92 #endif
  93
  94 #define SNDRV_PCM_IOCTL1_FALSE          ((void *)0)
  95 #define SNDRV_PCM_IOCTL1_TRUE           ((void *)1)
  96
  97 #define SNDRV_PCM_IOCTL1_RESET          0
  98 #define SNDRV_PCM_IOCTL1_INFO           1
  99 #define SNDRV_PCM_IOCTL1_CHANNEL_INFO   2
 100 #define SNDRV_PCM_IOCTL1_GSTATE         3
 101
 102 #define SNDRV_PCM_TRIGGER_STOP          0
 103 #define SNDRV_PCM_TRIGGER_START         1
 104 #define SNDRV_PCM_TRIGGER_PAUSE_PUSH    3
 105 #define SNDRV_PCM_TRIGGER_PAUSE_RELEASE 4
 106 #define SNDRV_PCM_TRIGGER_SUSPEND       5
 107 #define SNDRV_PCM_TRIGGER_RESUME        6
 108
 109 #define SNDRV_PCM_POS_XRUN              ((snd_pcm_uframes_t)-1)
 110
 111 /* If you change this don't forget to change rates[] table in pcm_native.c */
 112 #define SNDRV_PCM_RATE_5512             (1<<0)          /* 5512Hz */
 113 #define SNDRV_PCM_RATE_8000             (1<<1)          /* 8000Hz */
 114 #define SNDRV_PCM_RATE_11025            (1<<2)          /* 11025Hz */
 115 #define SNDRV_PCM_RATE_16000            (1<<3)          /* 16000Hz */
 116 #define SNDRV_PCM_RATE_22050            (1<<4)          /* 22050Hz */
 117 #define SNDRV_PCM_RATE_32000            (1<<5)          /* 32000Hz */
 118 #define SNDRV_PCM_RATE_44100            (1<<6)          /* 44100Hz */
 119 #define SNDRV_PCM_RATE_48000            (1<<7)          /* 48000Hz */
 120 #define SNDRV_PCM_RATE_64000            (1<<8)          /* 64000Hz */
 121 #define SNDRV_PCM_RATE_88200            (1<<9)          /* 88200Hz */
 122 #define SNDRV_PCM_RATE_96000            (1<<10)         /* 96000Hz */
 123 #define SNDRV_PCM_RATE_176400           (1<<11)         /* 176400Hz */
 124 #define SNDRV_PCM_RATE_192000           (1<<12)         /* 192000Hz */
 125
 126 #define SNDRV_PCM_RATE_CONTINUOUS       (1<<30)         /* continuous range */
 127 #define SNDRV_PCM_RATE_KNOT             (1<<31)         /* supports more non-continuos rates */
 128
 129 #define SNDRV_PCM_RATE_8000_44100       (SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_11025|\
 130                                          SNDRV_PCM_RATE_16000|SNDRV_PCM_RATE_22050|\
 131                                          SNDRV_PCM_RATE_32000|SNDRV_PCM_RATE_44100)
 132 #define SNDRV_PCM_RATE_8000_48000       (SNDRV_PCM_RATE_8000_44100|SNDRV_PCM_RATE_48000)
 133 #define SNDRV_PCM_RATE_8000_96000       (SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_64000|\
 134                                          SNDRV_PCM_RATE_88200|SNDRV_PCM_RATE_96000)
 135 #define SNDRV_PCM_RATE_8000_192000      (SNDRV_PCM_RATE_8000_96000|SNDRV_PCM_RATE_176400|\
 136                                          SNDRV_PCM_RATE_192000)
 137 #define SNDRV_PCM_FMTBIT_S8             (1ULL << SNDRV_PCM_FORMAT_S8)
 138 #define SNDRV_PCM_FMTBIT_U8             (1ULL << SNDRV_PCM_FORMAT_U8)
 139 #define SNDRV_PCM_FMTBIT_S16_LE         (1ULL << SNDRV_PCM_FORMAT_S16_LE)
 140 #define SNDRV_PCM_FMTBIT_S16_BE         (1ULL << SNDRV_PCM_FORMAT_S16_BE)
 141 #define SNDRV_PCM_FMTBIT_U16_LE         (1ULL << SNDRV_PCM_FORMAT_U16_LE)
 142 #define SNDRV_PCM_FMTBIT_U16_BE         (1ULL << SNDRV_PCM_FORMAT_U16_BE)
 143 #define SNDRV_PCM_FMTBIT_S24_LE         (1ULL << SNDRV_PCM_FORMAT_S24_LE)
 144 #define SNDRV_PCM_FMTBIT_S24_BE         (1ULL << SNDRV_PCM_FORMAT_S24_BE)
 145 #define SNDRV_PCM_FMTBIT_U24_LE         (1ULL << SNDRV_PCM_FORMAT_U24_LE)
 146 #define SNDRV_PCM_FMTBIT_U24_BE         (1ULL << SNDRV_PCM_FORMAT_U24_BE)
 147 #define SNDRV_PCM_FMTBIT_S32_LE         (1ULL << SNDRV_PCM_FORMAT_S32_LE)
 148 #define SNDRV_PCM_FMTBIT_S32_BE         (1ULL << SNDRV_PCM_FORMAT_S32_BE)
 149 #define SNDRV_PCM_FMTBIT_U32_LE         (1ULL << SNDRV_PCM_FORMAT_U32_LE)
 150 #define SNDRV_PCM_FMTBIT_U32_BE         (1ULL << SNDRV_PCM_FORMAT_U32_BE)
 151 #define SNDRV_PCM_FMTBIT_FLOAT_LE       (1ULL << SNDRV_PCM_FORMAT_FLOAT_LE)
 152 #define SNDRV_PCM_FMTBIT_FLOAT_BE       (1ULL << SNDRV_PCM_FORMAT_FLOAT_BE)
 153 #define SNDRV_PCM_FMTBIT_FLOAT64_LE     (1ULL << SNDRV_PCM_FORMAT_FLOAT64_LE)
 154 #define SNDRV_PCM_FMTBIT_FLOAT64_BE     (1ULL << SNDRV_PCM_FORMAT_FLOAT64_BE)
 155 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE (1ULL << SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE)
 156 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE (1ULL << SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE)
 157 #define SNDRV_PCM_FMTBIT_MU_LAW         (1ULL << SNDRV_PCM_FORMAT_MU_LAW)
 158 #define SNDRV_PCM_FMTBIT_A_LAW          (1ULL << SNDRV_PCM_FORMAT_A_LAW)
 159 #define SNDRV_PCM_FMTBIT_IMA_ADPCM      (1ULL << SNDRV_PCM_FORMAT_IMA_ADPCM)
 160 #define SNDRV_PCM_FMTBIT_MPEG           (1ULL << SNDRV_PCM_FORMAT_MPEG)
 161 #define SNDRV_PCM_FMTBIT_GSM            (1ULL << SNDRV_PCM_FORMAT_GSM)
 162 #define SNDRV_PCM_FMTBIT_SPECIAL        (1ULL << SNDRV_PCM_FORMAT_SPECIAL)
 163 #define SNDRV_PCM_FMTBIT_S24_3LE        (1ULL << SNDRV_PCM_FORMAT_S24_3LE)
 164 #define SNDRV_PCM_FMTBIT_U24_3LE        (1ULL << SNDRV_PCM_FORMAT_U24_3LE)
 165 #define SNDRV_PCM_FMTBIT_S24_3BE        (1ULL << SNDRV_PCM_FORMAT_S24_3BE)
 166 #define SNDRV_PCM_FMTBIT_U24_3BE        (1ULL << SNDRV_PCM_FORMAT_U24_3BE)
 167 #define SNDRV_PCM_FMTBIT_S20_3LE        (1ULL << SNDRV_PCM_FORMAT_S20_3LE)
 168 #define SNDRV_PCM_FMTBIT_U20_3LE        (1ULL << SNDRV_PCM_FORMAT_U20_3LE)
 169 #define SNDRV_PCM_FMTBIT_S20_3BE        (1ULL << SNDRV_PCM_FORMAT_S20_3BE)
 170 #define SNDRV_PCM_FMTBIT_U20_3BE        (1ULL << SNDRV_PCM_FORMAT_U20_3BE)
 171 #define SNDRV_PCM_FMTBIT_S18_3LE        (1ULL << SNDRV_PCM_FORMAT_S18_3LE)
 172 #define SNDRV_PCM_FMTBIT_U18_3LE        (1ULL << SNDRV_PCM_FORMAT_U18_3LE)
 173 #define SNDRV_PCM_FMTBIT_S18_3BE        (1ULL << SNDRV_PCM_FORMAT_S18_3BE)
 174 #define SNDRV_PCM_FMTBIT_U18_3BE        (1ULL << SNDRV_PCM_FORMAT_U18_3BE)
 175
 176 #ifdef SNDRV_LITTLE_ENDIAN
 177 #define SNDRV_PCM_FMTBIT_S16            SNDRV_PCM_FMTBIT_S16_LE
 178 #define SNDRV_PCM_FMTBIT_U16            SNDRV_PCM_FMTBIT_U16_LE
 179 #define SNDRV_PCM_FMTBIT_S24            SNDRV_PCM_FMTBIT_S24_LE
 180 #define SNDRV_PCM_FMTBIT_U24            SNDRV_PCM_FMTBIT_U24_LE
 181 #define SNDRV_PCM_FMTBIT_S32            SNDRV_PCM_FMTBIT_S32_LE
 182 #define SNDRV_PCM_FMTBIT_U32            SNDRV_PCM_FMTBIT_U32_LE
 183 #define SNDRV_PCM_FMTBIT_FLOAT          SNDRV_PCM_FMTBIT_FLOAT_LE
 184 #define SNDRV_PCM_FMTBIT_FLOAT64        SNDRV_PCM_FMTBIT_FLOAT64_LE
 185 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE
 186 #endif
 187 #ifdef SNDRV_BIG_ENDIAN
 188 #define SNDRV_PCM_FMTBIT_S16            SNDRV_PCM_FMTBIT_S16_BE
 189 #define SNDRV_PCM_FMTBIT_U16            SNDRV_PCM_FMTBIT_U16_BE
 190 #define SNDRV_PCM_FMTBIT_S24            SNDRV_PCM_FMTBIT_S24_BE
 191 #define SNDRV_PCM_FMTBIT_U24            SNDRV_PCM_FMTBIT_U24_BE
 192 #define SNDRV_PCM_FMTBIT_S32            SNDRV_PCM_FMTBIT_S32_BE
 193 #define SNDRV_PCM_FMTBIT_U32            SNDRV_PCM_FMTBIT_U32_BE
 194 #define SNDRV_PCM_FMTBIT_FLOAT          SNDRV_PCM_FMTBIT_FLOAT_BE
 195 #define SNDRV_PCM_FMTBIT_FLOAT64        SNDRV_PCM_FMTBIT_FLOAT64_BE
 196 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE
 197 #endif
 198
 199 struct snd_pcm_file {
 200         struct snd_pcm_substream *substream;
 201         int no_compat_mmap;
 202 };
 203
 204 struct snd_pcm_hw_rule;
 205 typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params,
 206                                       struct snd_pcm_hw_rule *rule);
 207
 208 struct snd_pcm_hw_rule {
 209         unsigned int cond;
 210         snd_pcm_hw_rule_func_t func;
 211         int var;
 212         int deps[4];
 213         void *private;
 214 };
 215
 216 struct snd_pcm_hw_constraints {
 217         struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK -
 218                          SNDRV_PCM_HW_PARAM_FIRST_MASK + 1];
 219         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL -
 220                              SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
 221         unsigned int rules_num;
 222         unsigned int rules_all;
 223         struct snd_pcm_hw_rule *rules;
 224 };
 225
 226 static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs,
 227                                             snd_pcm_hw_param_t var)
 228 {
 229         return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 230 }
 231
 232 static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs,
 233                                                     snd_pcm_hw_param_t var)
 234 {
 235         return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 236 }
 237
 238 struct snd_ratnum {
 239         unsigned int num;
 240         unsigned int den_min, den_max, den_step;
 241 };
 242
 243 struct snd_ratden {
 244         unsigned int num_min, num_max, num_step;
 245         unsigned int den;
 246 };
 247
 248 struct snd_pcm_hw_constraint_ratnums {
 249         int nrats;
 250         struct snd_ratnum *rats;
 251 };
 252
 253 struct snd_pcm_hw_constraint_ratdens {
 254         int nrats;
 255         struct snd_ratden *rats;
 256 };
 257
 258 struct snd_pcm_hw_constraint_list {
 259         unsigned int count;
 260         unsigned int *list;
 261         unsigned int mask;
 262 };
 263
 264 struct snd_pcm_runtime {
 265         /* -- Status -- */
 266         struct snd_pcm_substream *trigger_master;
 267         struct timespec trigger_tstamp; /* trigger timestamp */
 268         int overrange;
 269         snd_pcm_uframes_t avail_max;
 270         snd_pcm_uframes_t hw_ptr_base;  /* Position at buffer restart */
 271         snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time*/
 272
 273         /* -- HW params -- */
 274         snd_pcm_access_t access;        /* access mode */
 275         snd_pcm_format_t format;        /* SNDRV_PCM_FORMAT_* */
 276         snd_pcm_subformat_t subformat;  /* subformat */
 277         unsigned int rate;              /* rate in Hz */
 278         unsigned int channels;          /* channels */
 279         snd_pcm_uframes_t period_size;  /* period size */
 280         unsigned int periods;           /* periods */
 281         snd_pcm_uframes_t buffer_size;  /* buffer size */
 282         snd_pcm_uframes_t min_align;    /* Min alignment for the format */
 283         size_t byte_align;
 284         unsigned int frame_bits;
 285         unsigned int sample_bits;
 286         unsigned int info;
 287         unsigned int rate_num;
 288         unsigned int rate_den;
 289
 290         /* -- SW params -- */
 291         int tstamp_mode;                /* mmap timestamp is updated */
 292         unsigned int period_step;
 293         snd_pcm_uframes_t start_threshold;
 294         snd_pcm_uframes_t stop_threshold;
 295         snd_pcm_uframes_t silence_threshold; /* Silence filling happens when
 296                                                 noise is nearest than this */
 297         snd_pcm_uframes_t silence_size; /* Silence filling size */
 298         snd_pcm_uframes_t boundary;     /* pointers wrap point */
 299
 300         snd_pcm_uframes_t silence_start; /* starting pointer to silence area */
 301         snd_pcm_uframes_t silence_filled; /* size filled with silence */
 302
 303         union snd_pcm_sync_id sync;     /* hardware synchronization ID */
 304
 305         /* -- mmap -- */
 306         struct snd_pcm_mmap_status *status;
 307         struct snd_pcm_mmap_control *control;
 308
 309         /* -- locking / scheduling -- */
 310         wait_queue_head_t sleep;
 311         struct fasync_struct *fasync;
 312
 313         /* -- private section -- */
 314         void *private_data;
 315         void (*private_free)(struct snd_pcm_runtime *runtime);
 316
 317         /* -- hardware description -- */
 318         struct snd_pcm_hardware hw;
 319         struct snd_pcm_hw_constraints hw_constraints;
 320
 321         /* -- interrupt callbacks -- */
 322         void (*transfer_ack_begin)(struct snd_pcm_substream *substream);
 323         void (*transfer_ack_end)(struct snd_pcm_substream *substream);
 324
 325         /* -- timer -- */
 326         unsigned int timer_resolution;  /* timer resolution */
 327         int tstamp_type;                /* timestamp type */
 328
 329         /* -- DMA -- */
 330         unsigned char *dma_area;        /* DMA area */
 331         dma_addr_t dma_addr;            /* physical bus address (not accessible from main CPU) */
 332         size_t dma_bytes;               /* size of DMA area */
 333
 334         struct snd_dma_buffer *dma_buffer_p;    /* allocated buffer */
 335
 336 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 337         /* -- OSS things -- */
 338         struct snd_pcm_oss_runtime oss;
 339 #endif
 340 };
 341
 342 struct snd_pcm_group {          /* keep linked substreams */
 343         spinlock_t lock;
 344         struct list_head substreams;
 345         int count;
 346 };
 347
 348 struct snd_pcm_substream {
 349         struct snd_pcm *pcm;
 350         struct snd_pcm_str *pstr;
 351         void *private_data;             /* copied from pcm->private_data */
 352         int number;
 353         char name[32];                  /* substream name */
 354         int stream;                     /* stream (direction) */
 355         char latency_id[20];            /* latency identifier */
 356         size_t buffer_bytes_max;        /* limit ring buffer size */
 357         struct snd_dma_buffer dma_buffer;
 358         unsigned int dma_buf_id;
 359         size_t dma_max;
 360         /* -- hardware operations -- */
 361         struct snd_pcm_ops *ops;
 362         /* -- runtime information -- */
 363         struct snd_pcm_runtime *runtime;
 364         /* -- timer section -- */
 365         struct snd_timer *timer;                /* timer */
 366         unsigned timer_running: 1;      /* time is running */
 367         spinlock_t timer_lock;
 368         /* -- next substream -- */
 369         struct snd_pcm_substream *next;
 370         /* -- linked substreams -- */
 371         struct list_head link_list;     /* linked list member */
 372         struct snd_pcm_group self_group;        /* fake group for non linked substream (with substream lock inside) */
 373         struct snd_pcm_group *group;            /* pointer to current group */
 374         /* -- assigned files -- */
 375         void *file;
 376         int ref_count;
 377         atomic_t mmap_count;
 378         unsigned int f_flags;
 379         void (*pcm_release)(struct snd_pcm_substream *);
 380 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 381         /* -- OSS things -- */
 382         struct snd_pcm_oss_substream oss;
 383 #endif
 384 #ifdef CONFIG_SND_VERBOSE_PROCFS
 385         struct snd_info_entry *proc_root;
 386         struct snd_info_entry *proc_info_entry;
 387         struct snd_info_entry *proc_hw_params_entry;
 388         struct snd_info_entry *proc_sw_params_entry;
 389         struct snd_info_entry *proc_status_entry;
 390         struct snd_info_entry *proc_prealloc_entry;
 391         struct snd_info_entry *proc_prealloc_max_entry;
 392 #endif
 393         /* misc flags */
 394         unsigned int hw_opened: 1;
 395 };
 396
 397 #define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0)
 398
 399
 400 struct snd_pcm_str {
 401         int stream;                             /* stream (direction) */
 402         struct snd_pcm *pcm;
 403         /* -- substreams -- */
 404         unsigned int substream_count;
 405         unsigned int substream_opened;
 406         struct snd_pcm_substream *substream;
 407 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 408         /* -- OSS things -- */
 409         struct snd_pcm_oss_stream 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 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 415         unsigned int xrun_debug;        /* 0 = disabled, 1 = verbose, 2 = stacktrace */
 416         struct snd_info_entry *proc_xrun_debug_entry;
 417 #endif
 418 #endif
 419 };
 420
 421 struct snd_pcm {
 422         struct snd_card *card;
 423         struct list_head list;
 424         int device; /* device number */
 425         unsigned int info_flags;
 426         unsigned short dev_class;
 427         unsigned short dev_subclass;
 428         char id[64];
 429         char name[80];
 430         struct snd_pcm_str streams[2];
 431         struct mutex open_mutex;
 432         wait_queue_head_t open_wait;
 433         void *private_data;
 434         void (*private_free) (struct snd_pcm *pcm);
 435         struct device *dev; /* actual hw device this belongs to */
 436 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 437         struct snd_pcm_oss oss;
 438 #endif
 439 };
 440
 441 struct snd_pcm_notify {
 442         int (*n_register) (struct snd_pcm * pcm);
 443         int (*n_disconnect) (struct snd_pcm * pcm);
 444         int (*n_unregister) (struct snd_pcm * pcm);
 445         struct list_head list;
 446 };
 447
 448 /*
 449  *  Registering
 450  */
 451
 452 extern const struct file_operations snd_pcm_f_ops[2];
 453
 454 int snd_pcm_new(struct snd_card *card, char *id, int device,
 455                 int playback_count, int capture_count,
 456                 struct snd_pcm **rpcm);
 457 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
 458
 459 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
 460
 461 /*
 462  *  Native I/O
 463  */
 464
 465 extern rwlock_t snd_pcm_link_rwlock;
 466
 467 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
 468 int snd_pcm_info_user(struct snd_pcm_substream *substream,
 469                       struct snd_pcm_info __user *info);
 470 int snd_pcm_status(struct snd_pcm_substream *substream,
 471                    struct snd_pcm_status *status);
 472 int snd_pcm_start(struct snd_pcm_substream *substream);
 473 int snd_pcm_stop(struct snd_pcm_substream *substream, int status);
 474 int snd_pcm_drain_done(struct snd_pcm_substream *substream);
 475 #ifdef CONFIG_PM
 476 int snd_pcm_suspend(struct snd_pcm_substream *substream);
 477 int snd_pcm_suspend_all(struct snd_pcm *pcm);
 478 #endif
 479 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
 480 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
 481                            struct snd_pcm_substream **rsubstream);
 482 void snd_pcm_release_substream(struct snd_pcm_substream *substream);
 483 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
 484                              struct snd_pcm_substream **rsubstream);
 485 void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
 486 void snd_pcm_vma_notify_data(void *client, void *data);
 487 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
 488
 489 #if BITS_PER_LONG >= 64
 490
 491 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
 492 {
 493         *rem = *n % div;
 494         *n /= div;
 495 }
 496
 497 #elif defined(i386)
 498
 499 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
 500 {
 501         u_int32_t low, high;
 502         low = *n & 0xffffffff;
 503         high = *n >> 32;
 504         if (high) {
 505                 u_int32_t high1 = high % div;
 506                 high /= div;
 507                 asm("divl %2":"=a" (low), "=d" (*rem):"rm" (div), "a" (low), "d" (high1));
 508                 *n = (u_int64_t)high << 32 | low;
 509         } else {
 510                 *n = low / div;
 511                 *rem = low % div;
 512         }
 513 }
 514 #else
 515
 516 static inline void divl(u_int32_t high, u_int32_t low,
 517                         u_int32_t div,
 518                         u_int32_t *q, u_int32_t *r)
 519 {
 520         u_int64_t n = (u_int64_t)high << 32 | low;
 521         u_int64_t d = (u_int64_t)div << 31;
 522         u_int32_t q1 = 0;
 523         int c = 32;
 524         while (n > 0xffffffffU) {
 525                 q1 <<= 1;
 526                 if (n >= d) {
 527                         n -= d;
 528                         q1 |= 1;
 529                 }
 530                 d >>= 1;
 531                 c--;
 532         }
 533         q1 <<= c;
 534         if (n) {
 535                 low = n;
 536                 *q = q1 | (low / div);
 537                 *r = low % div;
 538         } else {
 539                 *r = 0;
 540                 *q = q1;
 541         }
 542         return;
 543 }
 544
 545 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
 546 {
 547         u_int32_t low, high;
 548         low = *n & 0xffffffff;
 549         high = *n >> 32;
 550         if (high) {
 551                 u_int32_t high1 = high % div;
 552                 u_int32_t low1 = low;
 553                 high /= div;
 554                 divl(high1, low1, div, &low, rem);
 555                 *n = (u_int64_t)high << 32 | low;
 556         } else {
 557                 *n = low / div;
 558                 *rem = low % div;
 559         }
 560 }
 561 #endif
 562
 563 /*
 564  *  PCM library
 565  */
 566
 567 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
 568 {
 569         return substream->group != &substream->self_group;
 570 }
 571
 572 static inline void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
 573 {
 574         read_lock(&snd_pcm_link_rwlock);
 575         spin_lock(&substream->self_group.lock);
 576 }
 577
 578 static inline void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
 579 {
 580         spin_unlock(&substream->self_group.lock);
 581         read_unlock(&snd_pcm_link_rwlock);
 582 }
 583
 584 static inline void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
 585 {
 586         read_lock_irq(&snd_pcm_link_rwlock);
 587         spin_lock(&substream->self_group.lock);
 588 }
 589
 590 static inline void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
 591 {
 592         spin_unlock(&substream->self_group.lock);
 593         read_unlock_irq(&snd_pcm_link_rwlock);
 594 }
 595
 596 #define snd_pcm_stream_lock_irqsave(substream, flags) \
 597 do { \
 598         read_lock_irqsave(&snd_pcm_link_rwlock, (flags)); \
 599         spin_lock(&substream->self_group.lock); \
 600 } while (0)
 601
 602 #define snd_pcm_stream_unlock_irqrestore(substream, flags) \
 603 do { \
 604         spin_unlock(&substream->self_group.lock); \
 605         read_unlock_irqrestore(&snd_pcm_link_rwlock, (flags)); \
 606 } while (0)
 607
 608 #define snd_pcm_group_for_each_entry(s, substream) \
 609         list_for_each_entry(s, &substream->group->substreams, link_list)
 610
 611 static inline int snd_pcm_running(struct snd_pcm_substream *substream)
 612 {
 613         return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 614                 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
 615                  substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
 616 }
 617
 618 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
 619 {
 620         return size * 8 / runtime->sample_bits;
 621 }
 622
 623 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
 624 {
 625         return size * 8 / runtime->frame_bits;
 626 }
 627
 628 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
 629 {
 630         return size * runtime->sample_bits / 8;
 631 }
 632
 633 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
 634 {
 635         return size * runtime->frame_bits / 8;
 636 }
 637
 638 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
 639 {
 640         return bytes % runtime->byte_align == 0;
 641 }
 642
 643 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
 644 {
 645         struct snd_pcm_runtime *runtime = substream->runtime;
 646         return frames_to_bytes(runtime, runtime->buffer_size);
 647 }
 648
 649 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
 650 {
 651         struct snd_pcm_runtime *runtime = substream->runtime;
 652         return frames_to_bytes(runtime, runtime->period_size);
 653 }
 654
 655 /*
 656  *  result is: 0 ... (boundary - 1)
 657  */
 658 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
 659 {
 660         snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
 661         if (avail < 0)
 662                 avail += runtime->boundary;
 663         else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
 664                 avail -= runtime->boundary;
 665         return avail;
 666 }
 667
 668 /*
 669  *  result is: 0 ... (boundary - 1)
 670  */
 671 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
 672 {
 673         snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
 674         if (avail < 0)
 675                 avail += runtime->boundary;
 676         return avail;
 677 }
 678
 679 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
 680 {
 681         return runtime->buffer_size - snd_pcm_playback_avail(runtime);
 682 }
 683
 684 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
 685 {
 686         return runtime->buffer_size - snd_pcm_capture_avail(runtime);
 687 }
 688
 689 /**
 690  * snd_pcm_playback_ready - check whether the playback buffer is available
 691  * @substream: the pcm substream instance
 692  *
 693  * Checks whether enough free space is available on the playback buffer.
 694  *
 695  * Returns non-zero if available, or zero if not.
 696  */
 697 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
 698 {
 699         struct snd_pcm_runtime *runtime = substream->runtime;
 700         return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
 701 }
 702
 703 /**
 704  * snd_pcm_capture_ready - check whether the capture buffer is available
 705  * @substream: the pcm substream instance
 706  *
 707  * Checks whether enough capture data is available on the capture buffer.
 708  *
 709  * Returns non-zero if available, or zero if not.
 710  */
 711 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
 712 {
 713         struct snd_pcm_runtime *runtime = substream->runtime;
 714         return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
 715 }
 716
 717 /**
 718  * snd_pcm_playback_data - check whether any data exists on the playback buffer
 719  * @substream: the pcm substream instance
 720  *
 721  * Checks whether any data exists on the playback buffer. If stop_threshold
 722  * is bigger or equal to boundary, then this function returns always non-zero.
 723  *
 724  * Returns non-zero if exists, or zero if not.
 725  */
 726 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
 727 {
 728         struct snd_pcm_runtime *runtime = substream->runtime;
 729
 730         if (runtime->stop_threshold >= runtime->boundary)
 731                 return 1;
 732         return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
 733 }
 734
 735 /**
 736  * snd_pcm_playback_empty - check whether the playback buffer is empty
 737  * @substream: the pcm substream instance
 738  *
 739  * Checks whether the playback buffer is empty.
 740  *
 741  * Returns non-zero if empty, or zero if not.
 742  */
 743 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
 744 {
 745         struct snd_pcm_runtime *runtime = substream->runtime;
 746         return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
 747 }
 748
 749 /**
 750  * snd_pcm_capture_empty - check whether the capture buffer is empty
 751  * @substream: the pcm substream instance
 752  *
 753  * Checks whether the capture buffer is empty.
 754  *
 755  * Returns non-zero if empty, or zero if not.
 756  */
 757 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
 758 {
 759         struct snd_pcm_runtime *runtime = substream->runtime;
 760         return snd_pcm_capture_avail(runtime) == 0;
 761 }
 762
 763 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream,
 764                                         struct snd_pcm_substream *master)
 765 {
 766         substream->runtime->trigger_master = master;
 767 }
 768
 769 static inline int hw_is_mask(int var)
 770 {
 771         return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
 772                 var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
 773 }
 774
 775 static inline int hw_is_interval(int var)
 776 {
 777         return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
 778                 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
 779 }
 780
 781 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
 782                                      snd_pcm_hw_param_t var)
 783 {
 784         return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 785 }
 786
 787 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
 788                                              snd_pcm_hw_param_t var)
 789 {
 790         return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 791 }
 792
 793 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
 794                                              snd_pcm_hw_param_t var)
 795 {
 796         return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 797 }
 798
 799 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
 800                                                      snd_pcm_hw_param_t var)
 801 {
 802         return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 803 }
 804
 805 #define params_access(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_ACCESS))
 806 #define params_format(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_FORMAT))
 807 #define params_subformat(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_SUBFORMAT))
 808 #define params_channels(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_CHANNELS)->min
 809 #define params_rate(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_RATE)->min
 810 #define params_period_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min
 811 #define params_period_bytes(p) ((params_period_size(p)*snd_pcm_format_physical_width(params_format(p))*params_channels(p))/8)
 812 #define params_periods(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIODS)->min
 813 #define params_buffer_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min
 814 #define params_buffer_bytes(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min
 815
 816
 817 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
 818 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
 819 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
 820 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
 821                           unsigned int k, struct snd_interval *c);
 822 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
 823                           const struct snd_interval *b, struct snd_interval *c);
 824 int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask);
 825 int snd_interval_ratnum(struct snd_interval *i,
 826                         unsigned int rats_count, struct snd_ratnum *rats,
 827                         unsigned int *nump, unsigned int *denp);
 828
 829 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
 830 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
 831 int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
 832
 833 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
 834
 835 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream);
 836 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream);
 837
 838 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 839                                u_int32_t mask);
 840 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 841                                  u_int64_t mask);
 842 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 843                                  unsigned int min, unsigned int max);
 844 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
 845 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
 846                                unsigned int cond,
 847                                snd_pcm_hw_param_t var,
 848                                struct snd_pcm_hw_constraint_list *l);
 849 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
 850                                   unsigned int cond,
 851                                   snd_pcm_hw_param_t var,
 852                                   struct snd_pcm_hw_constraint_ratnums *r);
 853 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
 854                                   unsigned int cond,
 855                                   snd_pcm_hw_param_t var,
 856                                   struct snd_pcm_hw_constraint_ratdens *r);
 857 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
 858                                  unsigned int cond,
 859                                  unsigned int width,
 860                                  unsigned int msbits);
 861 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
 862                                unsigned int cond,
 863                                snd_pcm_hw_param_t var,
 864                                unsigned long step);
 865 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
 866                                unsigned int cond,
 867                                snd_pcm_hw_param_t var);
 868 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
 869                         unsigned int cond,
 870                         int var,
 871                         snd_pcm_hw_rule_func_t func, void *private,
 872                         int dep, ...);
 873
 874 int snd_pcm_format_signed(snd_pcm_format_t format);
 875 int snd_pcm_format_unsigned(snd_pcm_format_t format);
 876 int snd_pcm_format_linear(snd_pcm_format_t format);
 877 int snd_pcm_format_little_endian(snd_pcm_format_t format);
 878 int snd_pcm_format_big_endian(snd_pcm_format_t format);
 879 #if 0 /* just for DocBook */
 880 /**
 881  * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
 882  * @format: the format to check
 883  *
 884  * Returns 1 if the given PCM format is CPU-endian, 0 if
 885  * opposite, or a negative error code if endian not specified.
 886  */
 887 int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
 888 #endif /* DocBook */
 889 #ifdef SNDRV_LITTLE_ENDIAN
 890 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
 891 #else
 892 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
 893 #endif
 894 int snd_pcm_format_width(snd_pcm_format_t format);                      /* in bits */
 895 int snd_pcm_format_physical_width(snd_pcm_format_t format);             /* in bits */
 896 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
 897 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
 898 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
 899 snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsignd, int big_endian);
 900
 901 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction, struct snd_pcm_ops *ops);
 902 void snd_pcm_set_sync(struct snd_pcm_substream *substream);
 903 int snd_pcm_lib_interleave_len(struct snd_pcm_substream *substream);
 904 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
 905                       unsigned int cmd, void *arg);
 906 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream);
 907 int snd_pcm_playback_xrun_check(struct snd_pcm_substream *substream);
 908 int snd_pcm_capture_xrun_check(struct snd_pcm_substream *substream);
 909 int snd_pcm_playback_xrun_asap(struct snd_pcm_substream *substream);
 910 int snd_pcm_capture_xrun_asap(struct snd_pcm_substream *substream);
 911 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr);
 912 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
 913 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream,
 914                                     const void __user *buf,
 915                                     snd_pcm_uframes_t frames);
 916 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream,
 917                                    void __user *buf, snd_pcm_uframes_t frames);
 918 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
 919                                      void __user **bufs, snd_pcm_uframes_t frames);
 920 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
 921                                     void __user **bufs, snd_pcm_uframes_t frames);
 922
 923 extern const struct snd_pcm_hw_constraint_list snd_pcm_known_rates;
 924
 925 int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime);
 926 unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate);
 927
 928 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
 929                                               struct snd_dma_buffer *bufp)
 930 {
 931         struct snd_pcm_runtime *runtime = substream->runtime;
 932         if (bufp) {
 933                 runtime->dma_buffer_p = bufp;
 934                 runtime->dma_area = bufp->area;
 935                 runtime->dma_addr = bufp->addr;
 936                 runtime->dma_bytes = bufp->bytes;
 937         } else {
 938                 runtime->dma_buffer_p = NULL;
 939                 runtime->dma_area = NULL;
 940                 runtime->dma_addr = 0;
 941                 runtime->dma_bytes = 0;
 942         }
 943 }
 944
 945 /*
 946  *  Timer interface
 947  */
 948
 949 void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream);
 950 void snd_pcm_timer_init(struct snd_pcm_substream *substream);
 951 void snd_pcm_timer_done(struct snd_pcm_substream *substream);
 952
 953 static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime,
 954                                    struct timespec *tv)
 955 {
 956         if (runtime->tstamp_type == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
 957                 do_posix_clock_monotonic_gettime(tv);
 958         else
 959                 getnstimeofday(tv);
 960 }
 961
 962 /*
 963  *  Memory
 964  */
 965
 966 int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
 967 int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
 968 int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
 969                                   int type, struct device *data,
 970                                   size_t size, size_t max);
 971 int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
 972                                           int type, void *data,
 973                                           size_t size, size_t max);
 974 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
 975 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
 976
 977 /*
 978  * SG-buffer handling
 979  */
 980 #define snd_pcm_substream_sgbuf(substream) \
 981         ((substream)->runtime->dma_buffer_p->private_data)
 982
 983 static inline dma_addr_t
 984 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
 985 {
 986         struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream);
 987         return snd_sgbuf_get_addr(sg, ofs);
 988 }
 989
 990 static inline void *
 991 snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
 992 {
 993         struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream);
 994         return snd_sgbuf_get_ptr(sg, ofs);
 995 }
 996
 997 struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream,
 998                                     unsigned long offset);
 999 unsigned int snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
1000                                           unsigned int ofs, unsigned int size);
1001
1002 /* handle mmap counter - PCM mmap callback should handle this counter properly */
1003 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
1004 {
1005         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1006         atomic_inc(&substream->mmap_count);
1007 }
1008
1009 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
1010 {
1011         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1012         atomic_dec(&substream->mmap_count);
1013 }
1014
1015 /* mmap for io-memory area */
1016 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
1017 #define SNDRV_PCM_INFO_MMAP_IOMEM       SNDRV_PCM_INFO_MMAP
1018 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
1019 #else
1020 #define SNDRV_PCM_INFO_MMAP_IOMEM       0
1021 #define snd_pcm_lib_mmap_iomem  NULL
1022 #endif
1023
1024 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
1025 {
1026         *max = dma < 4 ? 64 * 1024 : 128 * 1024;
1027 }
1028
1029 /*
1030  *  Misc
1031  */
1032
1033 #define SNDRV_PCM_DEFAULT_CON_SPDIF     (IEC958_AES0_CON_EMPHASIS_NONE|\
1034                                          (IEC958_AES1_CON_ORIGINAL<<8)|\
1035                                          (IEC958_AES1_CON_PCM_CODER<<8)|\
1036                                          (IEC958_AES3_CON_FS_48000<<24))
1037
1038 #define PCM_RUNTIME_CHECK(sub) snd_BUG_ON(!(sub) || !(sub)->runtime)
1039
1040 #endif /* __SOUND_PCM_H */