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