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