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         unsigned long hw_ptr_jiffies;   /* Time when hw_ptr is updated */
 273         snd_pcm_sframes_t delay;        /* extra delay; typically FIFO size */
 274
 275         /* -- HW params -- */
 276         snd_pcm_access_t access;        /* access mode */
 277         snd_pcm_format_t format;        /* SNDRV_PCM_FORMAT_* */
 278         snd_pcm_subformat_t subformat;  /* subformat */
 279         unsigned int rate;              /* rate in Hz */
 280         unsigned int channels;          /* channels */
 281         snd_pcm_uframes_t period_size;  /* period size */
 282         unsigned int periods;           /* periods */
 283         snd_pcm_uframes_t buffer_size;  /* buffer size */
 284         snd_pcm_uframes_t min_align;    /* Min alignment for the format */
 285         size_t byte_align;
 286         unsigned int frame_bits;
 287         unsigned int sample_bits;
 288         unsigned int info;
 289         unsigned int rate_num;
 290         unsigned int rate_den;
 291
 292         /* -- SW params -- */
 293         int tstamp_mode;                /* mmap timestamp is updated */
 294         unsigned int period_step;
 295         snd_pcm_uframes_t start_threshold;
 296         snd_pcm_uframes_t stop_threshold;
 297         snd_pcm_uframes_t silence_threshold; /* Silence filling happens when
 298                                                 noise is nearest than this */
 299         snd_pcm_uframes_t silence_size; /* Silence filling size */
 300         snd_pcm_uframes_t boundary;     /* pointers wrap point */
 301
 302         snd_pcm_uframes_t silence_start; /* starting pointer to silence area */
 303         snd_pcm_uframes_t silence_filled; /* size filled with silence */
 304
 305         union snd_pcm_sync_id sync;     /* hardware synchronization ID */
 306
 307         /* -- mmap -- */
 308         struct snd_pcm_mmap_status *status;
 309         struct snd_pcm_mmap_control *control;
 310
 311         /* -- locking / scheduling -- */
 312         wait_queue_head_t sleep;
 313         struct fasync_struct *fasync;
 314
 315         /* -- private section -- */
 316         void *private_data;
 317         void (*private_free)(struct snd_pcm_runtime *runtime);
 318
 319         /* -- hardware description -- */
 320         struct snd_pcm_hardware hw;
 321         struct snd_pcm_hw_constraints hw_constraints;
 322
 323         /* -- interrupt callbacks -- */
 324         void (*transfer_ack_begin)(struct snd_pcm_substream *substream);
 325         void (*transfer_ack_end)(struct snd_pcm_substream *substream);
 326
 327         /* -- timer -- */
 328         unsigned int timer_resolution;  /* timer resolution */
 329         int tstamp_type;                /* timestamp type */
 330
 331         /* -- DMA -- */
 332         unsigned char *dma_area;        /* DMA area */
 333         dma_addr_t dma_addr;            /* physical bus address (not accessible from main CPU) */
 334         size_t dma_bytes;               /* size of DMA area */
 335
 336         struct snd_dma_buffer *dma_buffer_p;    /* allocated buffer */
 337
 338 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 339         /* -- OSS things -- */
 340         struct snd_pcm_oss_runtime oss;
 341 #endif
 342 };
 343
 344 struct snd_pcm_group {          /* keep linked substreams */
 345         spinlock_t lock;
 346         struct list_head substreams;
 347         int count;
 348 };
 349
 350 struct snd_pcm_substream {
 351         struct snd_pcm *pcm;
 352         struct snd_pcm_str *pstr;
 353         void *private_data;             /* copied from pcm->private_data */
 354         int number;
 355         char name[32];                  /* substream name */
 356         int stream;                     /* stream (direction) */
 357         char latency_id[20];            /* latency identifier */
 358         size_t buffer_bytes_max;        /* limit ring buffer size */
 359         struct snd_dma_buffer dma_buffer;
 360         unsigned int dma_buf_id;
 361         size_t dma_max;
 362         /* -- hardware operations -- */
 363         struct snd_pcm_ops *ops;
 364         /* -- runtime information -- */
 365         struct snd_pcm_runtime *runtime;
 366         /* -- timer section -- */
 367         struct snd_timer *timer;                /* timer */
 368         unsigned timer_running: 1;      /* time is running */
 369         /* -- next substream -- */
 370         struct snd_pcm_substream *next;
 371         /* -- linked substreams -- */
 372         struct list_head link_list;     /* linked list member */
 373         struct snd_pcm_group self_group;        /* fake group for non linked substream (with substream lock inside) */
 374         struct snd_pcm_group *group;            /* pointer to current group */
 375         /* -- assigned files -- */
 376         void *file;
 377         int ref_count;
 378         atomic_t mmap_count;
 379         unsigned int f_flags;
 380         void (*pcm_release)(struct snd_pcm_substream *);
 381 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 382         /* -- OSS things -- */
 383         struct snd_pcm_oss_substream oss;
 384 #endif
 385 #ifdef CONFIG_SND_VERBOSE_PROCFS
 386         struct snd_info_entry *proc_root;
 387         struct snd_info_entry *proc_info_entry;
 388         struct snd_info_entry *proc_hw_params_entry;
 389         struct snd_info_entry *proc_sw_params_entry;
 390         struct snd_info_entry *proc_status_entry;
 391         struct snd_info_entry *proc_prealloc_entry;
 392         struct snd_info_entry *proc_prealloc_max_entry;
 393 #endif
 394         /* misc flags */
 395         unsigned int hw_opened: 1;
 396 };
 397
 398 #define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0)
 399
 400
 401 struct snd_pcm_str {
 402         int stream;                             /* stream (direction) */
 403         struct snd_pcm *pcm;
 404         /* -- substreams -- */
 405         unsigned int substream_count;
 406         unsigned int substream_opened;
 407         struct snd_pcm_substream *substream;
 408 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 409         /* -- OSS things -- */
 410         struct snd_pcm_oss_stream oss;
 411 #endif
 412 #ifdef CONFIG_SND_VERBOSE_PROCFS
 413         struct snd_info_entry *proc_root;
 414         struct snd_info_entry *proc_info_entry;
 415 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 416         unsigned int xrun_debug;        /* 0 = disabled, 1 = verbose, 2 = stacktrace */
 417         struct snd_info_entry *proc_xrun_debug_entry;
 418 #endif
 419 #endif
 420 };
 421
 422 struct snd_pcm {
 423         struct snd_card *card;
 424         struct list_head list;
 425         int device; /* device number */
 426         unsigned int info_flags;
 427         unsigned short dev_class;
 428         unsigned short dev_subclass;
 429         char id[64];
 430         char name[80];
 431         struct snd_pcm_str streams[2];
 432         struct mutex open_mutex;
 433         wait_queue_head_t open_wait;
 434         void *private_data;
 435         void (*private_free) (struct snd_pcm *pcm);
 436         struct device *dev; /* actual hw device this belongs to */
 437 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 438         struct snd_pcm_oss oss;
 439 #endif
 440 };
 441
 442 struct snd_pcm_notify {
 443         int (*n_register) (struct snd_pcm * pcm);
 444         int (*n_disconnect) (struct snd_pcm * pcm);
 445         int (*n_unregister) (struct snd_pcm * pcm);
 446         struct list_head list;
 447 };
 448
 449 /*
 450  *  Registering
 451  */
 452
 453 extern const struct file_operations snd_pcm_f_ops[2];
 454
 455 int snd_pcm_new(struct snd_card *card, const char *id, int device,
 456                 int playback_count, int capture_count,
 457                 struct snd_pcm **rpcm);
 458 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
 459
 460 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
 461
 462 /*
 463  *  Native I/O
 464  */
 465
 466 extern rwlock_t snd_pcm_link_rwlock;
 467
 468 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
 469 int snd_pcm_info_user(struct snd_pcm_substream *substream,
 470                       struct snd_pcm_info __user *info);
 471 int snd_pcm_status(struct snd_pcm_substream *substream,
 472                    struct snd_pcm_status *status);
 473 int snd_pcm_start(struct snd_pcm_substream *substream);
 474 int snd_pcm_stop(struct snd_pcm_substream *substream, int status);
 475 int snd_pcm_drain_done(struct snd_pcm_substream *substream);
 476 #ifdef CONFIG_PM
 477 int snd_pcm_suspend(struct snd_pcm_substream *substream);
 478 int snd_pcm_suspend_all(struct snd_pcm *pcm);
 479 #endif
 480 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
 481 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
 482                            struct snd_pcm_substream **rsubstream);
 483 void snd_pcm_release_substream(struct snd_pcm_substream *substream);
 484 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
 485                              struct snd_pcm_substream **rsubstream);
 486 void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
 487 void snd_pcm_vma_notify_data(void *client, void *data);
 488 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
 489
 490 #if BITS_PER_LONG >= 64
 491
 492 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
 493 {
 494         *rem = *n % div;
 495         *n /= div;
 496 }
 497
 498 #elif defined(i386)
 499
 500 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
 501 {
 502         u_int32_t low, high;
 503         low = *n & 0xffffffff;
 504         high = *n >> 32;
 505         if (high) {
 506                 u_int32_t high1 = high % div;
 507                 high /= div;
 508                 asm("divl %2":"=a" (low), "=d" (*rem):"rm" (div), "a" (low), "d" (high1));
 509                 *n = (u_int64_t)high << 32 | low;
 510         } else {
 511                 *n = low / div;
 512                 *rem = low % div;
 513         }
 514 }
 515 #else
 516
 517 static inline void divl(u_int32_t high, u_int32_t low,
 518                         u_int32_t div,
 519                         u_int32_t *q, u_int32_t *r)
 520 {
 521         u_int64_t n = (u_int64_t)high << 32 | low;
 522         u_int64_t d = (u_int64_t)div << 31;
 523         u_int32_t q1 = 0;
 524         int c = 32;
 525         while (n > 0xffffffffU) {
 526                 q1 <<= 1;
 527                 if (n >= d) {
 528                         n -= d;
 529                         q1 |= 1;
 530                 }
 531                 d >>= 1;
 532                 c--;
 533         }
 534         q1 <<= c;
 535         if (n) {
 536                 low = n;
 537                 *q = q1 | (low / div);
 538                 *r = low % div;
 539         } else {
 540                 *r = 0;
 541                 *q = q1;
 542         }
 543         return;
 544 }
 545
 546 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
 547 {
 548         u_int32_t low, high;
 549         low = *n & 0xffffffff;
 550         high = *n >> 32;
 551         if (high) {
 552                 u_int32_t high1 = high % div;
 553                 u_int32_t low1 = low;
 554                 high /= div;
 555                 divl(high1, low1, div, &low, rem);
 556                 *n = (u_int64_t)high << 32 | low;
 557         } else {
 558                 *n = low / div;
 559                 *rem = low % div;
 560         }
 561 }
 562 #endif
 563
 564 /*
 565  *  PCM library
 566  */
 567
 568 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
 569 {
 570         return substream->group != &substream->self_group;
 571 }
 572
 573 static inline void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
 574 {
 575         read_lock(&snd_pcm_link_rwlock);
 576         spin_lock(&substream->self_group.lock);
 577 }
 578
 579 static inline void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
 580 {
 581         spin_unlock(&substream->self_group.lock);
 582         read_unlock(&snd_pcm_link_rwlock);
 583 }
 584
 585 static inline void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
 586 {
 587         read_lock_irq(&snd_pcm_link_rwlock);
 588         spin_lock(&substream->self_group.lock);
 589 }
 590
 591 static inline void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
 592 {
 593         spin_unlock(&substream->self_group.lock);
 594         read_unlock_irq(&snd_pcm_link_rwlock);
 595 }
 596
 597 #define snd_pcm_stream_lock_irqsave(substream, flags) \
 598 do { \
 599         read_lock_irqsave(&snd_pcm_link_rwlock, (flags)); \
 600         spin_lock(&substream->self_group.lock); \
 601 } while (0)
 602
 603 #define snd_pcm_stream_unlock_irqrestore(substream, flags) \
 604 do { \
 605         spin_unlock(&substream->self_group.lock); \
 606         read_unlock_irqrestore(&snd_pcm_link_rwlock, (flags)); \
 607 } while (0)
 608
 609 #define snd_pcm_group_for_each_entry(s, substream) \
 610         list_for_each_entry(s, &substream->group->substreams, link_list)
 611
 612 static inline int snd_pcm_running(struct snd_pcm_substream *substream)
 613 {
 614         return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 615                 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
 616                  substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
 617 }
 618
 619 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
 620 {
 621         return size * 8 / runtime->sample_bits;
 622 }
 623
 624 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
 625 {
 626         return size * 8 / runtime->frame_bits;
 627 }
 628
 629 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
 630 {
 631         return size * runtime->sample_bits / 8;
 632 }
 633
 634 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
 635 {
 636         return size * runtime->frame_bits / 8;
 637 }
 638
 639 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
 640 {
 641         return bytes % runtime->byte_align == 0;
 642 }
 643
 644 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
 645 {
 646         struct snd_pcm_runtime *runtime = substream->runtime;
 647         return frames_to_bytes(runtime, runtime->buffer_size);
 648 }
 649
 650 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
 651 {
 652         struct snd_pcm_runtime *runtime = substream->runtime;
 653         return frames_to_bytes(runtime, runtime->period_size);
 654 }
 655
 656 /*
 657  *  result is: 0 ... (boundary - 1)
 658  */
 659 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
 660 {
 661         snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
 662         if (avail < 0)
 663                 avail += runtime->boundary;
 664         else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
 665                 avail -= runtime->boundary;
 666         return avail;
 667 }
 668
 669 /*
 670  *  result is: 0 ... (boundary - 1)
 671  */
 672 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
 673 {
 674         snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
 675         if (avail < 0)
 676                 avail += runtime->boundary;
 677         return avail;
 678 }
 679
 680 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
 681 {
 682         return runtime->buffer_size - snd_pcm_playback_avail(runtime);
 683 }
 684
 685 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
 686 {
 687         return runtime->buffer_size - snd_pcm_capture_avail(runtime);
 688 }
 689
 690 /**
 691  * snd_pcm_playback_ready - check whether the playback buffer is available
 692  * @substream: the pcm substream instance
 693  *
 694  * Checks whether enough free space is available on the playback buffer.
 695  *
 696  * Returns non-zero if available, or zero if not.
 697  */
 698 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
 699 {
 700         struct snd_pcm_runtime *runtime = substream->runtime;
 701         return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
 702 }
 703
 704 /**
 705  * snd_pcm_capture_ready - check whether the capture buffer is available
 706  * @substream: the pcm substream instance
 707  *
 708  * Checks whether enough capture data is available on the capture buffer.
 709  *
 710  * Returns non-zero if available, or zero if not.
 711  */
 712 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
 713 {
 714         struct snd_pcm_runtime *runtime = substream->runtime;
 715         return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
 716 }
 717
 718 /**
 719  * snd_pcm_playback_data - check whether any data exists on the playback buffer
 720  * @substream: the pcm substream instance
 721  *
 722  * Checks whether any data exists on the playback buffer. If stop_threshold
 723  * is bigger or equal to boundary, then this function returns always non-zero.
 724  *
 725  * Returns non-zero if exists, or zero if not.
 726  */
 727 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
 728 {
 729         struct snd_pcm_runtime *runtime = substream->runtime;
 730
 731         if (runtime->stop_threshold >= runtime->boundary)
 732                 return 1;
 733         return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
 734 }
 735
 736 /**
 737  * snd_pcm_playback_empty - check whether the playback buffer is empty
 738  * @substream: the pcm substream instance
 739  *
 740  * Checks whether the playback buffer is empty.
 741  *
 742  * Returns non-zero if empty, or zero if not.
 743  */
 744 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
 745 {
 746         struct snd_pcm_runtime *runtime = substream->runtime;
 747         return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
 748 }
 749
 750 /**
 751  * snd_pcm_capture_empty - check whether the capture buffer is empty
 752  * @substream: the pcm substream instance
 753  *
 754  * Checks whether the capture buffer is empty.
 755  *
 756  * Returns non-zero if empty, or zero if not.
 757  */
 758 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
 759 {
 760         struct snd_pcm_runtime *runtime = substream->runtime;
 761         return snd_pcm_capture_avail(runtime) == 0;
 762 }
 763
 764 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream,
 765                                         struct snd_pcm_substream *master)
 766 {
 767         substream->runtime->trigger_master = master;
 768 }
 769
 770 static inline int hw_is_mask(int var)
 771 {
 772         return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
 773                 var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
 774 }
 775
 776 static inline int hw_is_interval(int var)
 777 {
 778         return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
 779                 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
 780 }
 781
 782 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
 783                                      snd_pcm_hw_param_t var)
 784 {
 785         return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 786 }
 787
 788 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
 789                                              snd_pcm_hw_param_t var)
 790 {
 791         return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 792 }
 793
 794 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
 795                                              snd_pcm_hw_param_t var)
 796 {
 797         return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 798 }
 799
 800 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
 801                                                      snd_pcm_hw_param_t var)
 802 {
 803         return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 804 }
 805
 806 #define params_access(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_ACCESS))
 807 #define params_format(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_FORMAT))
 808 #define params_subformat(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_SUBFORMAT))
 809 #define params_channels(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_CHANNELS)->min
 810 #define params_rate(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_RATE)->min
 811 #define params_period_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min
 812 #define params_period_bytes(p) ((params_period_size(p)*snd_pcm_format_physical_width(params_format(p))*params_channels(p))/8)
 813 #define params_periods(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIODS)->min
 814 #define params_buffer_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min
 815 #define params_buffer_bytes(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min
 816
 817
 818 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
 819 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
 820 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
 821 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
 822                           unsigned int k, struct snd_interval *c);
 823 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
 824                           const struct snd_interval *b, struct snd_interval *c);
 825 int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask);
 826 int snd_interval_ratnum(struct snd_interval *i,
 827                         unsigned int rats_count, struct snd_ratnum *rats,
 828                         unsigned int *nump, unsigned int *denp);
 829
 830 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
 831 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
 832 int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
 833
 834 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
 835
 836 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream);
 837 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream);
 838
 839 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 840                                u_int32_t mask);
 841 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 842                                  u_int64_t mask);
 843 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 844                                  unsigned int min, unsigned int max);
 845 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
 846 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
 847                                unsigned int cond,
 848                                snd_pcm_hw_param_t var,
 849                                struct snd_pcm_hw_constraint_list *l);
 850 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
 851                                   unsigned int cond,
 852                                   snd_pcm_hw_param_t var,
 853                                   struct snd_pcm_hw_constraint_ratnums *r);
 854 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
 855                                   unsigned int cond,
 856                                   snd_pcm_hw_param_t var,
 857                                   struct snd_pcm_hw_constraint_ratdens *r);
 858 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
 859                                  unsigned int cond,
 860                                  unsigned int width,
 861                                  unsigned int msbits);
 862 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
 863                                unsigned int cond,
 864                                snd_pcm_hw_param_t var,
 865                                unsigned long step);
 866 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
 867                                unsigned int cond,
 868                                snd_pcm_hw_param_t var);
 869 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
 870                         unsigned int cond,
 871                         int var,
 872                         snd_pcm_hw_rule_func_t func, void *private,
 873                         int dep, ...);
 874
 875 int snd_pcm_format_signed(snd_pcm_format_t format);
 876 int snd_pcm_format_unsigned(snd_pcm_format_t format);
 877 int snd_pcm_format_linear(snd_pcm_format_t format);
 878 int snd_pcm_format_little_endian(snd_pcm_format_t format);
 879 int snd_pcm_format_big_endian(snd_pcm_format_t format);
 880 #if 0 /* just for DocBook */
 881 /**
 882  * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
 883  * @format: the format to check
 884  *
 885  * Returns 1 if the given PCM format is CPU-endian, 0 if
 886  * opposite, or a negative error code if endian not specified.
 887  */
 888 int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
 889 #endif /* DocBook */
 890 #ifdef SNDRV_LITTLE_ENDIAN
 891 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
 892 #else
 893 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
 894 #endif
 895 int snd_pcm_format_width(snd_pcm_format_t format);                      /* in bits */
 896 int snd_pcm_format_physical_width(snd_pcm_format_t format);             /* in bits */
 897 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
 898 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
 899 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
 900 snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsignd, int big_endian);
 901
 902 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction, struct snd_pcm_ops *ops);
 903 void snd_pcm_set_sync(struct snd_pcm_substream *substream);
 904 int snd_pcm_lib_interleave_len(struct snd_pcm_substream *substream);
 905 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
 906                       unsigned int cmd, void *arg);
 907 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream);
 908 int snd_pcm_playback_xrun_check(struct snd_pcm_substream *substream);
 909 int snd_pcm_capture_xrun_check(struct snd_pcm_substream *substream);
 910 int snd_pcm_playback_xrun_asap(struct snd_pcm_substream *substream);
 911 int snd_pcm_capture_xrun_asap(struct snd_pcm_substream *substream);
 912 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr);
 913 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
 914 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream,
 915                                     const void __user *buf,
 916                                     snd_pcm_uframes_t frames);
 917 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream,
 918                                    void __user *buf, snd_pcm_uframes_t frames);
 919 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
 920                                      void __user **bufs, snd_pcm_uframes_t frames);
 921 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
 922                                     void __user **bufs, snd_pcm_uframes_t frames);
 923
 924 extern const struct snd_pcm_hw_constraint_list snd_pcm_known_rates;
 925
 926 int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime);
 927 unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate);
 928
 929 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
 930                                               struct snd_dma_buffer *bufp)
 931 {
 932         struct snd_pcm_runtime *runtime = substream->runtime;
 933         if (bufp) {
 934                 runtime->dma_buffer_p = bufp;
 935                 runtime->dma_area = bufp->area;
 936                 runtime->dma_addr = bufp->addr;
 937                 runtime->dma_bytes = bufp->bytes;
 938         } else {
 939                 runtime->dma_buffer_p = NULL;
 940                 runtime->dma_area = NULL;
 941                 runtime->dma_addr = 0;
 942                 runtime->dma_bytes = 0;
 943         }
 944 }
 945
 946 /*
 947  *  Timer interface
 948  */
 949
 950 void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream);
 951 void snd_pcm_timer_init(struct snd_pcm_substream *substream);
 952 void snd_pcm_timer_done(struct snd_pcm_substream *substream);
 953
 954 static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime,
 955                                    struct timespec *tv)
 956 {
 957         if (runtime->tstamp_type == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
 958                 do_posix_clock_monotonic_gettime(tv);
 959         else
 960                 getnstimeofday(tv);
 961 }
 962
 963 /*
 964  *  Memory
 965  */
 966
 967 int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
 968 int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
 969 int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
 970                                   int type, struct device *data,
 971                                   size_t size, size_t max);
 972 int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
 973                                           int type, void *data,
 974                                           size_t size, size_t max);
 975 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
 976 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
 977
 978 /*
 979  * SG-buffer handling
 980  */
 981 #define snd_pcm_substream_sgbuf(substream) \
 982         ((substream)->runtime->dma_buffer_p->private_data)
 983
 984 static inline dma_addr_t
 985 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
 986 {
 987         struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream);
 988         return snd_sgbuf_get_addr(sg, ofs);
 989 }
 990
 991 static inline void *
 992 snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
 993 {
 994         struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream);
 995         return snd_sgbuf_get_ptr(sg, ofs);
 996 }
 997
 998 struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream,
 999                                     unsigned long offset);
1000 unsigned int snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
1001                                           unsigned int ofs, unsigned int size);
1002
1003 /* handle mmap counter - PCM mmap callback should handle this counter properly */
1004 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
1005 {
1006         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1007         atomic_inc(&substream->mmap_count);
1008 }
1009
1010 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
1011 {
1012         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1013         atomic_dec(&substream->mmap_count);
1014 }
1015
1016 /* mmap for io-memory area */
1017 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
1018 #define SNDRV_PCM_INFO_MMAP_IOMEM       SNDRV_PCM_INFO_MMAP
1019 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
1020 #else
1021 #define SNDRV_PCM_INFO_MMAP_IOMEM       0
1022 #define snd_pcm_lib_mmap_iomem  NULL
1023 #endif
1024
1025 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
1026 {
1027         *max = dma < 4 ? 64 * 1024 : 128 * 1024;
1028 }
1029
1030 /*
1031  *  Misc
1032  */
1033
1034 #define SNDRV_PCM_DEFAULT_CON_SPDIF     (IEC958_AES0_CON_EMPHASIS_NONE|\
1035                                          (IEC958_AES1_CON_ORIGINAL<<8)|\
1036                                          (IEC958_AES1_CON_PCM_CODER<<8)|\
1037                                          (IEC958_AES3_CON_FS_48000<<24))
1038
1039 #define PCM_RUNTIME_CHECK(sub) snd_BUG_ON(!(sub) || !(sub)->runtime)
1040
1041 #endif /* __SOUND_PCM_H */