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 #define SNDRV_PCM_IOCTL1_FIFO_SIZE      4
 102
 103 #define SNDRV_PCM_TRIGGER_STOP          0
 104 #define SNDRV_PCM_TRIGGER_START         1
 105 #define SNDRV_PCM_TRIGGER_PAUSE_PUSH    3
 106 #define SNDRV_PCM_TRIGGER_PAUSE_RELEASE 4
 107 #define SNDRV_PCM_TRIGGER_SUSPEND       5
 108 #define SNDRV_PCM_TRIGGER_RESUME        6
 109
 110 #define SNDRV_PCM_POS_XRUN              ((snd_pcm_uframes_t)-1)
 111
 112 /* If you change this don't forget to change rates[] table in pcm_native.c */
 113 #define SNDRV_PCM_RATE_5512             (1<<0)          /* 5512Hz */
 114 #define SNDRV_PCM_RATE_8000             (1<<1)          /* 8000Hz */
 115 #define SNDRV_PCM_RATE_11025            (1<<2)          /* 11025Hz */
 116 #define SNDRV_PCM_RATE_16000            (1<<3)          /* 16000Hz */
 117 #define SNDRV_PCM_RATE_22050            (1<<4)          /* 22050Hz */
 118 #define SNDRV_PCM_RATE_32000            (1<<5)          /* 32000Hz */
 119 #define SNDRV_PCM_RATE_44100            (1<<6)          /* 44100Hz */
 120 #define SNDRV_PCM_RATE_48000            (1<<7)          /* 48000Hz */
 121 #define SNDRV_PCM_RATE_64000            (1<<8)          /* 64000Hz */
 122 #define SNDRV_PCM_RATE_88200            (1<<9)          /* 88200Hz */
 123 #define SNDRV_PCM_RATE_96000            (1<<10)         /* 96000Hz */
 124 #define SNDRV_PCM_RATE_176400           (1<<11)         /* 176400Hz */
 125 #define SNDRV_PCM_RATE_192000           (1<<12)         /* 192000Hz */
 126
 127 #define SNDRV_PCM_RATE_CONTINUOUS       (1<<30)         /* continuous range */
 128 #define SNDRV_PCM_RATE_KNOT             (1<<31)         /* supports more non-continuos rates */
 129
 130 #define SNDRV_PCM_RATE_8000_44100       (SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_11025|\
 131                                          SNDRV_PCM_RATE_16000|SNDRV_PCM_RATE_22050|\
 132                                          SNDRV_PCM_RATE_32000|SNDRV_PCM_RATE_44100)
 133 #define SNDRV_PCM_RATE_8000_48000       (SNDRV_PCM_RATE_8000_44100|SNDRV_PCM_RATE_48000)
 134 #define SNDRV_PCM_RATE_8000_96000       (SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_64000|\
 135                                          SNDRV_PCM_RATE_88200|SNDRV_PCM_RATE_96000)
 136 #define SNDRV_PCM_RATE_8000_192000      (SNDRV_PCM_RATE_8000_96000|SNDRV_PCM_RATE_176400|\
 137                                          SNDRV_PCM_RATE_192000)
 138 #define SNDRV_PCM_FMTBIT_S8             (1ULL << SNDRV_PCM_FORMAT_S8)
 139 #define SNDRV_PCM_FMTBIT_U8             (1ULL << SNDRV_PCM_FORMAT_U8)
 140 #define SNDRV_PCM_FMTBIT_S16_LE         (1ULL << SNDRV_PCM_FORMAT_S16_LE)
 141 #define SNDRV_PCM_FMTBIT_S16_BE         (1ULL << SNDRV_PCM_FORMAT_S16_BE)
 142 #define SNDRV_PCM_FMTBIT_U16_LE         (1ULL << SNDRV_PCM_FORMAT_U16_LE)
 143 #define SNDRV_PCM_FMTBIT_U16_BE         (1ULL << SNDRV_PCM_FORMAT_U16_BE)
 144 #define SNDRV_PCM_FMTBIT_S24_LE         (1ULL << SNDRV_PCM_FORMAT_S24_LE)
 145 #define SNDRV_PCM_FMTBIT_S24_BE         (1ULL << SNDRV_PCM_FORMAT_S24_BE)
 146 #define SNDRV_PCM_FMTBIT_U24_LE         (1ULL << SNDRV_PCM_FORMAT_U24_LE)
 147 #define SNDRV_PCM_FMTBIT_U24_BE         (1ULL << SNDRV_PCM_FORMAT_U24_BE)
 148 #define SNDRV_PCM_FMTBIT_S32_LE         (1ULL << SNDRV_PCM_FORMAT_S32_LE)
 149 #define SNDRV_PCM_FMTBIT_S32_BE         (1ULL << SNDRV_PCM_FORMAT_S32_BE)
 150 #define SNDRV_PCM_FMTBIT_U32_LE         (1ULL << SNDRV_PCM_FORMAT_U32_LE)
 151 #define SNDRV_PCM_FMTBIT_U32_BE         (1ULL << SNDRV_PCM_FORMAT_U32_BE)
 152 #define SNDRV_PCM_FMTBIT_FLOAT_LE       (1ULL << SNDRV_PCM_FORMAT_FLOAT_LE)
 153 #define SNDRV_PCM_FMTBIT_FLOAT_BE       (1ULL << SNDRV_PCM_FORMAT_FLOAT_BE)
 154 #define SNDRV_PCM_FMTBIT_FLOAT64_LE     (1ULL << SNDRV_PCM_FORMAT_FLOAT64_LE)
 155 #define SNDRV_PCM_FMTBIT_FLOAT64_BE     (1ULL << SNDRV_PCM_FORMAT_FLOAT64_BE)
 156 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE (1ULL << SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE)
 157 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE (1ULL << SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE)
 158 #define SNDRV_PCM_FMTBIT_MU_LAW         (1ULL << SNDRV_PCM_FORMAT_MU_LAW)
 159 #define SNDRV_PCM_FMTBIT_A_LAW          (1ULL << SNDRV_PCM_FORMAT_A_LAW)
 160 #define SNDRV_PCM_FMTBIT_IMA_ADPCM      (1ULL << SNDRV_PCM_FORMAT_IMA_ADPCM)
 161 #define SNDRV_PCM_FMTBIT_MPEG           (1ULL << SNDRV_PCM_FORMAT_MPEG)
 162 #define SNDRV_PCM_FMTBIT_GSM            (1ULL << SNDRV_PCM_FORMAT_GSM)
 163 #define SNDRV_PCM_FMTBIT_SPECIAL        (1ULL << SNDRV_PCM_FORMAT_SPECIAL)
 164 #define SNDRV_PCM_FMTBIT_S24_3LE        (1ULL << SNDRV_PCM_FORMAT_S24_3LE)
 165 #define SNDRV_PCM_FMTBIT_U24_3LE        (1ULL << SNDRV_PCM_FORMAT_U24_3LE)
 166 #define SNDRV_PCM_FMTBIT_S24_3BE        (1ULL << SNDRV_PCM_FORMAT_S24_3BE)
 167 #define SNDRV_PCM_FMTBIT_U24_3BE        (1ULL << SNDRV_PCM_FORMAT_U24_3BE)
 168 #define SNDRV_PCM_FMTBIT_S20_3LE        (1ULL << SNDRV_PCM_FORMAT_S20_3LE)
 169 #define SNDRV_PCM_FMTBIT_U20_3LE        (1ULL << SNDRV_PCM_FORMAT_U20_3LE)
 170 #define SNDRV_PCM_FMTBIT_S20_3BE        (1ULL << SNDRV_PCM_FORMAT_S20_3BE)
 171 #define SNDRV_PCM_FMTBIT_U20_3BE        (1ULL << SNDRV_PCM_FORMAT_U20_3BE)
 172 #define SNDRV_PCM_FMTBIT_S18_3LE        (1ULL << SNDRV_PCM_FORMAT_S18_3LE)
 173 #define SNDRV_PCM_FMTBIT_U18_3LE        (1ULL << SNDRV_PCM_FORMAT_U18_3LE)
 174 #define SNDRV_PCM_FMTBIT_S18_3BE        (1ULL << SNDRV_PCM_FORMAT_S18_3BE)
 175 #define SNDRV_PCM_FMTBIT_U18_3BE        (1ULL << SNDRV_PCM_FORMAT_U18_3BE)
 176
 177 #ifdef SNDRV_LITTLE_ENDIAN
 178 #define SNDRV_PCM_FMTBIT_S16            SNDRV_PCM_FMTBIT_S16_LE
 179 #define SNDRV_PCM_FMTBIT_U16            SNDRV_PCM_FMTBIT_U16_LE
 180 #define SNDRV_PCM_FMTBIT_S24            SNDRV_PCM_FMTBIT_S24_LE
 181 #define SNDRV_PCM_FMTBIT_U24            SNDRV_PCM_FMTBIT_U24_LE
 182 #define SNDRV_PCM_FMTBIT_S32            SNDRV_PCM_FMTBIT_S32_LE
 183 #define SNDRV_PCM_FMTBIT_U32            SNDRV_PCM_FMTBIT_U32_LE
 184 #define SNDRV_PCM_FMTBIT_FLOAT          SNDRV_PCM_FMTBIT_FLOAT_LE
 185 #define SNDRV_PCM_FMTBIT_FLOAT64        SNDRV_PCM_FMTBIT_FLOAT64_LE
 186 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE
 187 #endif
 188 #ifdef SNDRV_BIG_ENDIAN
 189 #define SNDRV_PCM_FMTBIT_S16            SNDRV_PCM_FMTBIT_S16_BE
 190 #define SNDRV_PCM_FMTBIT_U16            SNDRV_PCM_FMTBIT_U16_BE
 191 #define SNDRV_PCM_FMTBIT_S24            SNDRV_PCM_FMTBIT_S24_BE
 192 #define SNDRV_PCM_FMTBIT_U24            SNDRV_PCM_FMTBIT_U24_BE
 193 #define SNDRV_PCM_FMTBIT_S32            SNDRV_PCM_FMTBIT_S32_BE
 194 #define SNDRV_PCM_FMTBIT_U32            SNDRV_PCM_FMTBIT_U32_BE
 195 #define SNDRV_PCM_FMTBIT_FLOAT          SNDRV_PCM_FMTBIT_FLOAT_BE
 196 #define SNDRV_PCM_FMTBIT_FLOAT64        SNDRV_PCM_FMTBIT_FLOAT64_BE
 197 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE
 198 #endif
 199
 200 struct snd_pcm_file {
 201         struct snd_pcm_substream *substream;
 202         int no_compat_mmap;
 203 };
 204
 205 struct snd_pcm_hw_rule;
 206 typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params,
 207                                       struct snd_pcm_hw_rule *rule);
 208
 209 struct snd_pcm_hw_rule {
 210         unsigned int cond;
 211         snd_pcm_hw_rule_func_t func;
 212         int var;
 213         int deps[4];
 214         void *private;
 215 };
 216
 217 struct snd_pcm_hw_constraints {
 218         struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK -
 219                          SNDRV_PCM_HW_PARAM_FIRST_MASK + 1];
 220         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL -
 221                              SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
 222         unsigned int rules_num;
 223         unsigned int rules_all;
 224         struct snd_pcm_hw_rule *rules;
 225 };
 226
 227 static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs,
 228                                             snd_pcm_hw_param_t var)
 229 {
 230         return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 231 }
 232
 233 static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs,
 234                                                     snd_pcm_hw_param_t var)
 235 {
 236         return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 237 }
 238
 239 struct snd_ratnum {
 240         unsigned int num;
 241         unsigned int den_min, den_max, den_step;
 242 };
 243
 244 struct snd_ratden {
 245         unsigned int num_min, num_max, num_step;
 246         unsigned int den;
 247 };
 248
 249 struct snd_pcm_hw_constraint_ratnums {
 250         int nrats;
 251         struct snd_ratnum *rats;
 252 };
 253
 254 struct snd_pcm_hw_constraint_ratdens {
 255         int nrats;
 256         struct snd_ratden *rats;
 257 };
 258
 259 struct snd_pcm_hw_constraint_list {
 260         unsigned int count;
 261         unsigned int *list;
 262         unsigned int mask;
 263 };
 264
 265 struct snd_pcm_runtime {
 266         /* -- Status -- */
 267         struct snd_pcm_substream *trigger_master;
 268         struct timespec trigger_tstamp; /* trigger timestamp */
 269         int overrange;
 270         snd_pcm_uframes_t avail_max;
 271         snd_pcm_uframes_t hw_ptr_base;  /* Position at buffer restart */
 272         snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time */
 273         unsigned long hw_ptr_jiffies;   /* Time when hw_ptr is updated */
 274         snd_pcm_sframes_t delay;        /* extra delay; typically FIFO size */
 275
 276         /* -- HW params -- */
 277         snd_pcm_access_t access;        /* access mode */
 278         snd_pcm_format_t format;        /* SNDRV_PCM_FORMAT_* */
 279         snd_pcm_subformat_t subformat;  /* subformat */
 280         unsigned int rate;              /* rate in Hz */
 281         unsigned int channels;          /* channels */
 282         snd_pcm_uframes_t period_size;  /* period size */
 283         unsigned int periods;           /* periods */
 284         snd_pcm_uframes_t buffer_size;  /* buffer size */
 285         snd_pcm_uframes_t min_align;    /* Min alignment for the format */
 286         size_t byte_align;
 287         unsigned int frame_bits;
 288         unsigned int sample_bits;
 289         unsigned int info;
 290         unsigned int rate_num;
 291         unsigned int rate_den;
 292
 293         /* -- SW params -- */
 294         int tstamp_mode;                /* mmap timestamp is updated */
 295         unsigned int period_step;
 296         snd_pcm_uframes_t start_threshold;
 297         snd_pcm_uframes_t stop_threshold;
 298         snd_pcm_uframes_t silence_threshold; /* Silence filling happens when
 299                                                 noise is nearest than this */
 300         snd_pcm_uframes_t silence_size; /* Silence filling size */
 301         snd_pcm_uframes_t boundary;     /* pointers wrap point */
 302
 303         snd_pcm_uframes_t silence_start; /* starting pointer to silence area */
 304         snd_pcm_uframes_t silence_filled; /* size filled with silence */
 305
 306         union snd_pcm_sync_id sync;     /* hardware synchronization ID */
 307
 308         /* -- mmap -- */
 309         struct snd_pcm_mmap_status *status;
 310         struct snd_pcm_mmap_control *control;
 311
 312         /* -- locking / scheduling -- */
 313         wait_queue_head_t sleep;
 314         struct fasync_struct *fasync;
 315
 316         /* -- private section -- */
 317         void *private_data;
 318         void (*private_free)(struct snd_pcm_runtime *runtime);
 319
 320         /* -- hardware description -- */
 321         struct snd_pcm_hardware hw;
 322         struct snd_pcm_hw_constraints hw_constraints;
 323
 324         /* -- interrupt callbacks -- */
 325         void (*transfer_ack_begin)(struct snd_pcm_substream *substream);
 326         void (*transfer_ack_end)(struct snd_pcm_substream *substream);
 327
 328         /* -- timer -- */
 329         unsigned int timer_resolution;  /* timer resolution */
 330         int tstamp_type;                /* timestamp type */
 331
 332         /* -- DMA -- */
 333         unsigned char *dma_area;        /* DMA area */
 334         dma_addr_t dma_addr;            /* physical bus address (not accessible from main CPU) */
 335         size_t dma_bytes;               /* size of DMA area */
 336
 337         struct snd_dma_buffer *dma_buffer_p;    /* allocated buffer */
 338
 339 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 340         /* -- OSS things -- */
 341         struct snd_pcm_oss_runtime oss;
 342 #endif
 343 };
 344
 345 struct snd_pcm_group {          /* keep linked substreams */
 346         spinlock_t lock;
 347         struct list_head substreams;
 348         int count;
 349 };
 350
 351 struct snd_pcm_substream {
 352         struct snd_pcm *pcm;
 353         struct snd_pcm_str *pstr;
 354         void *private_data;             /* copied from pcm->private_data */
 355         int number;
 356         char name[32];                  /* substream name */
 357         int stream;                     /* stream (direction) */
 358         char latency_id[20];            /* latency identifier */
 359         size_t buffer_bytes_max;        /* limit ring buffer size */
 360         struct snd_dma_buffer dma_buffer;
 361         unsigned int dma_buf_id;
 362         size_t dma_max;
 363         /* -- hardware operations -- */
 364         struct snd_pcm_ops *ops;
 365         /* -- runtime information -- */
 366         struct snd_pcm_runtime *runtime;
 367         /* -- timer section -- */
 368         struct snd_timer *timer;                /* timer */
 369         unsigned timer_running: 1;      /* time is running */
 370         /* -- next substream -- */
 371         struct snd_pcm_substream *next;
 372         /* -- linked substreams -- */
 373         struct list_head link_list;     /* linked list member */
 374         struct snd_pcm_group self_group;        /* fake group for non linked substream (with substream lock inside) */
 375         struct snd_pcm_group *group;            /* pointer to current group */
 376         /* -- assigned files -- */
 377         void *file;
 378         int ref_count;
 379         atomic_t mmap_count;
 380         unsigned int f_flags;
 381         void (*pcm_release)(struct snd_pcm_substream *);
 382 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 383         /* -- OSS things -- */
 384         struct snd_pcm_oss_substream oss;
 385 #endif
 386 #ifdef CONFIG_SND_VERBOSE_PROCFS
 387         struct snd_info_entry *proc_root;
 388         struct snd_info_entry *proc_info_entry;
 389         struct snd_info_entry *proc_hw_params_entry;
 390         struct snd_info_entry *proc_sw_params_entry;
 391         struct snd_info_entry *proc_status_entry;
 392         struct snd_info_entry *proc_prealloc_entry;
 393         struct snd_info_entry *proc_prealloc_max_entry;
 394 #endif
 395         /* misc flags */
 396         unsigned int hw_opened: 1;
 397 };
 398
 399 #define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0)
 400
 401
 402 struct snd_pcm_str {
 403         int stream;                             /* stream (direction) */
 404         struct snd_pcm *pcm;
 405         /* -- substreams -- */
 406         unsigned int substream_count;
 407         unsigned int substream_opened;
 408         struct snd_pcm_substream *substream;
 409 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 410         /* -- OSS things -- */
 411         struct snd_pcm_oss_stream oss;
 412 #endif
 413 #ifdef CONFIG_SND_VERBOSE_PROCFS
 414         struct snd_info_entry *proc_root;
 415         struct snd_info_entry *proc_info_entry;
 416 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 417         unsigned int xrun_debug;        /* 0 = disabled, 1 = verbose, 2 = stacktrace */
 418         struct snd_info_entry *proc_xrun_debug_entry;
 419 #endif
 420 #endif
 421 };
 422
 423 struct snd_pcm {
 424         struct snd_card *card;
 425         struct list_head list;
 426         int device; /* device number */
 427         unsigned int info_flags;
 428         unsigned short dev_class;
 429         unsigned short dev_subclass;
 430         char id[64];
 431         char name[80];
 432         struct snd_pcm_str streams[2];
 433         struct mutex open_mutex;
 434         wait_queue_head_t open_wait;
 435         void *private_data;
 436         void (*private_free) (struct snd_pcm *pcm);
 437         struct device *dev; /* actual hw device this belongs to */
 438 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 439         struct snd_pcm_oss oss;
 440 #endif
 441 };
 442
 443 struct snd_pcm_notify {
 444         int (*n_register) (struct snd_pcm * pcm);
 445         int (*n_disconnect) (struct snd_pcm * pcm);
 446         int (*n_unregister) (struct snd_pcm * pcm);
 447         struct list_head list;
 448 };
 449
 450 /*
 451  *  Registering
 452  */
 453
 454 extern const struct file_operations snd_pcm_f_ops[2];
 455
 456 int snd_pcm_new(struct snd_card *card, const char *id, int device,
 457                 int playback_count, int capture_count,
 458                 struct snd_pcm **rpcm);
 459 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
 460
 461 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
 462
 463 /*
 464  *  Native I/O
 465  */
 466
 467 extern rwlock_t snd_pcm_link_rwlock;
 468
 469 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
 470 int snd_pcm_info_user(struct snd_pcm_substream *substream,
 471                       struct snd_pcm_info __user *info);
 472 int snd_pcm_status(struct snd_pcm_substream *substream,
 473                    struct snd_pcm_status *status);
 474 int snd_pcm_start(struct snd_pcm_substream *substream);
 475 int snd_pcm_stop(struct snd_pcm_substream *substream, int status);
 476 int snd_pcm_drain_done(struct snd_pcm_substream *substream);
 477 #ifdef CONFIG_PM
 478 int snd_pcm_suspend(struct snd_pcm_substream *substream);
 479 int snd_pcm_suspend_all(struct snd_pcm *pcm);
 480 #endif
 481 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
 482 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
 483                            struct snd_pcm_substream **rsubstream);
 484 void snd_pcm_release_substream(struct snd_pcm_substream *substream);
 485 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
 486                              struct snd_pcm_substream **rsubstream);
 487 void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
 488 void snd_pcm_vma_notify_data(void *client, void *data);
 489 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
 490
 491 /*
 492  *  PCM library
 493  */
 494
 495 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
 496 {
 497         return substream->group != &substream->self_group;
 498 }
 499
 500 static inline void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
 501 {
 502         read_lock(&snd_pcm_link_rwlock);
 503         spin_lock(&substream->self_group.lock);
 504 }
 505
 506 static inline void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
 507 {
 508         spin_unlock(&substream->self_group.lock);
 509         read_unlock(&snd_pcm_link_rwlock);
 510 }
 511
 512 static inline void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
 513 {
 514         read_lock_irq(&snd_pcm_link_rwlock);
 515         spin_lock(&substream->self_group.lock);
 516 }
 517
 518 static inline void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
 519 {
 520         spin_unlock(&substream->self_group.lock);
 521         read_unlock_irq(&snd_pcm_link_rwlock);
 522 }
 523
 524 #define snd_pcm_stream_lock_irqsave(substream, flags) \
 525 do { \
 526         read_lock_irqsave(&snd_pcm_link_rwlock, (flags)); \
 527         spin_lock(&substream->self_group.lock); \
 528 } while (0)
 529
 530 #define snd_pcm_stream_unlock_irqrestore(substream, flags) \
 531 do { \
 532         spin_unlock(&substream->self_group.lock); \
 533         read_unlock_irqrestore(&snd_pcm_link_rwlock, (flags)); \
 534 } while (0)
 535
 536 #define snd_pcm_group_for_each_entry(s, substream) \
 537         list_for_each_entry(s, &substream->group->substreams, link_list)
 538
 539 static inline int snd_pcm_running(struct snd_pcm_substream *substream)
 540 {
 541         return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 542                 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
 543                  substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
 544 }
 545
 546 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
 547 {
 548         return size * 8 / runtime->sample_bits;
 549 }
 550
 551 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
 552 {
 553         return size * 8 / runtime->frame_bits;
 554 }
 555
 556 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
 557 {
 558         return size * runtime->sample_bits / 8;
 559 }
 560
 561 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
 562 {
 563         return size * runtime->frame_bits / 8;
 564 }
 565
 566 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
 567 {
 568         return bytes % runtime->byte_align == 0;
 569 }
 570
 571 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
 572 {
 573         struct snd_pcm_runtime *runtime = substream->runtime;
 574         return frames_to_bytes(runtime, runtime->buffer_size);
 575 }
 576
 577 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
 578 {
 579         struct snd_pcm_runtime *runtime = substream->runtime;
 580         return frames_to_bytes(runtime, runtime->period_size);
 581 }
 582
 583 /*
 584  *  result is: 0 ... (boundary - 1)
 585  */
 586 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
 587 {
 588         snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
 589         if (avail < 0)
 590                 avail += runtime->boundary;
 591         else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
 592                 avail -= runtime->boundary;
 593         return avail;
 594 }
 595
 596 /*
 597  *  result is: 0 ... (boundary - 1)
 598  */
 599 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
 600 {
 601         snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
 602         if (avail < 0)
 603                 avail += runtime->boundary;
 604         return avail;
 605 }
 606
 607 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
 608 {
 609         return runtime->buffer_size - snd_pcm_playback_avail(runtime);
 610 }
 611
 612 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
 613 {
 614         return runtime->buffer_size - snd_pcm_capture_avail(runtime);
 615 }
 616
 617 /**
 618  * snd_pcm_playback_ready - check whether the playback buffer is available
 619  * @substream: the pcm substream instance
 620  *
 621  * Checks whether enough free space is available on the playback buffer.
 622  *
 623  * Returns non-zero if available, or zero if not.
 624  */
 625 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
 626 {
 627         struct snd_pcm_runtime *runtime = substream->runtime;
 628         return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
 629 }
 630
 631 /**
 632  * snd_pcm_capture_ready - check whether the capture buffer is available
 633  * @substream: the pcm substream instance
 634  *
 635  * Checks whether enough capture data is available on the capture buffer.
 636  *
 637  * Returns non-zero if available, or zero if not.
 638  */
 639 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
 640 {
 641         struct snd_pcm_runtime *runtime = substream->runtime;
 642         return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
 643 }
 644
 645 /**
 646  * snd_pcm_playback_data - check whether any data exists on the playback buffer
 647  * @substream: the pcm substream instance
 648  *
 649  * Checks whether any data exists on the playback buffer. If stop_threshold
 650  * is bigger or equal to boundary, then this function returns always non-zero.
 651  *
 652  * Returns non-zero if exists, or zero if not.
 653  */
 654 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
 655 {
 656         struct snd_pcm_runtime *runtime = substream->runtime;
 657
 658         if (runtime->stop_threshold >= runtime->boundary)
 659                 return 1;
 660         return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
 661 }
 662
 663 /**
 664  * snd_pcm_playback_empty - check whether the playback buffer is empty
 665  * @substream: the pcm substream instance
 666  *
 667  * Checks whether the playback buffer is empty.
 668  *
 669  * Returns non-zero if empty, or zero if not.
 670  */
 671 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
 672 {
 673         struct snd_pcm_runtime *runtime = substream->runtime;
 674         return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
 675 }
 676
 677 /**
 678  * snd_pcm_capture_empty - check whether the capture buffer is empty
 679  * @substream: the pcm substream instance
 680  *
 681  * Checks whether the capture buffer is empty.
 682  *
 683  * Returns non-zero if empty, or zero if not.
 684  */
 685 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
 686 {
 687         struct snd_pcm_runtime *runtime = substream->runtime;
 688         return snd_pcm_capture_avail(runtime) == 0;
 689 }
 690
 691 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream,
 692                                         struct snd_pcm_substream *master)
 693 {
 694         substream->runtime->trigger_master = master;
 695 }
 696
 697 static inline int hw_is_mask(int var)
 698 {
 699         return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
 700                 var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
 701 }
 702
 703 static inline int hw_is_interval(int var)
 704 {
 705         return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
 706                 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
 707 }
 708
 709 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
 710                                      snd_pcm_hw_param_t var)
 711 {
 712         return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 713 }
 714
 715 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
 716                                              snd_pcm_hw_param_t var)
 717 {
 718         return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 719 }
 720
 721 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
 722                                              snd_pcm_hw_param_t var)
 723 {
 724         return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 725 }
 726
 727 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
 728                                                      snd_pcm_hw_param_t var)
 729 {
 730         return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 731 }
 732
 733 #define params_access(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_ACCESS))
 734 #define params_format(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_FORMAT))
 735 #define params_subformat(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_SUBFORMAT))
 736 #define params_channels(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_CHANNELS)->min
 737 #define params_rate(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_RATE)->min
 738 #define params_period_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min
 739 #define params_period_bytes(p) ((params_period_size(p)*snd_pcm_format_physical_width(params_format(p))*params_channels(p))/8)
 740 #define params_periods(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIODS)->min
 741 #define params_buffer_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min
 742 #define params_buffer_bytes(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min
 743
 744
 745 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
 746 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
 747 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
 748 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
 749                           unsigned int k, struct snd_interval *c);
 750 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
 751                           const struct snd_interval *b, struct snd_interval *c);
 752 int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask);
 753 int snd_interval_ratnum(struct snd_interval *i,
 754                         unsigned int rats_count, struct snd_ratnum *rats,
 755                         unsigned int *nump, unsigned int *denp);
 756
 757 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
 758 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
 759 int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
 760
 761 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
 762
 763 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream);
 764 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream);
 765
 766 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 767                                u_int32_t mask);
 768 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 769                                  u_int64_t mask);
 770 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 771                                  unsigned int min, unsigned int max);
 772 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
 773 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
 774                                unsigned int cond,
 775                                snd_pcm_hw_param_t var,
 776                                struct snd_pcm_hw_constraint_list *l);
 777 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
 778                                   unsigned int cond,
 779                                   snd_pcm_hw_param_t var,
 780                                   struct snd_pcm_hw_constraint_ratnums *r);
 781 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
 782                                   unsigned int cond,
 783                                   snd_pcm_hw_param_t var,
 784                                   struct snd_pcm_hw_constraint_ratdens *r);
 785 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
 786                                  unsigned int cond,
 787                                  unsigned int width,
 788                                  unsigned int msbits);
 789 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
 790                                unsigned int cond,
 791                                snd_pcm_hw_param_t var,
 792                                unsigned long step);
 793 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
 794                                unsigned int cond,
 795                                snd_pcm_hw_param_t var);
 796 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
 797                         unsigned int cond,
 798                         int var,
 799                         snd_pcm_hw_rule_func_t func, void *private,
 800                         int dep, ...);
 801
 802 int snd_pcm_format_signed(snd_pcm_format_t format);
 803 int snd_pcm_format_unsigned(snd_pcm_format_t format);
 804 int snd_pcm_format_linear(snd_pcm_format_t format);
 805 int snd_pcm_format_little_endian(snd_pcm_format_t format);
 806 int snd_pcm_format_big_endian(snd_pcm_format_t format);
 807 #if 0 /* just for DocBook */
 808 /**
 809  * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
 810  * @format: the format to check
 811  *
 812  * Returns 1 if the given PCM format is CPU-endian, 0 if
 813  * opposite, or a negative error code if endian not specified.
 814  */
 815 int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
 816 #endif /* DocBook */
 817 #ifdef SNDRV_LITTLE_ENDIAN
 818 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
 819 #else
 820 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
 821 #endif
 822 int snd_pcm_format_width(snd_pcm_format_t format);                      /* in bits */
 823 int snd_pcm_format_physical_width(snd_pcm_format_t format);             /* in bits */
 824 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
 825 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
 826 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
 827 snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsignd, int big_endian);
 828
 829 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction, struct snd_pcm_ops *ops);
 830 void snd_pcm_set_sync(struct snd_pcm_substream *substream);
 831 int snd_pcm_lib_interleave_len(struct snd_pcm_substream *substream);
 832 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
 833                       unsigned int cmd, void *arg);
 834 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream);
 835 int snd_pcm_playback_xrun_check(struct snd_pcm_substream *substream);
 836 int snd_pcm_capture_xrun_check(struct snd_pcm_substream *substream);
 837 int snd_pcm_playback_xrun_asap(struct snd_pcm_substream *substream);
 838 int snd_pcm_capture_xrun_asap(struct snd_pcm_substream *substream);
 839 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr);
 840 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
 841 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream,
 842                                     const void __user *buf,
 843                                     snd_pcm_uframes_t frames);
 844 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream,
 845                                    void __user *buf, snd_pcm_uframes_t frames);
 846 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
 847                                      void __user **bufs, snd_pcm_uframes_t frames);
 848 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
 849                                     void __user **bufs, snd_pcm_uframes_t frames);
 850
 851 extern const struct snd_pcm_hw_constraint_list snd_pcm_known_rates;
 852
 853 int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime);
 854 unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate);
 855
 856 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
 857                                               struct snd_dma_buffer *bufp)
 858 {
 859         struct snd_pcm_runtime *runtime = substream->runtime;
 860         if (bufp) {
 861                 runtime->dma_buffer_p = bufp;
 862                 runtime->dma_area = bufp->area;
 863                 runtime->dma_addr = bufp->addr;
 864                 runtime->dma_bytes = bufp->bytes;
 865         } else {
 866                 runtime->dma_buffer_p = NULL;
 867                 runtime->dma_area = NULL;
 868                 runtime->dma_addr = 0;
 869                 runtime->dma_bytes = 0;
 870         }
 871 }
 872
 873 /*
 874  *  Timer interface
 875  */
 876
 877 void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream);
 878 void snd_pcm_timer_init(struct snd_pcm_substream *substream);
 879 void snd_pcm_timer_done(struct snd_pcm_substream *substream);
 880
 881 static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime,
 882                                    struct timespec *tv)
 883 {
 884         if (runtime->tstamp_type == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
 885                 do_posix_clock_monotonic_gettime(tv);
 886         else
 887                 getnstimeofday(tv);
 888 }
 889
 890 /*
 891  *  Memory
 892  */
 893
 894 int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
 895 int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
 896 int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
 897                                   int type, struct device *data,
 898                                   size_t size, size_t max);
 899 int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
 900                                           int type, void *data,
 901                                           size_t size, size_t max);
 902 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
 903 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
 904
 905 /*
 906  * SG-buffer handling
 907  */
 908 #define snd_pcm_substream_sgbuf(substream) \
 909         ((substream)->runtime->dma_buffer_p->private_data)
 910
 911 static inline dma_addr_t
 912 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
 913 {
 914         struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream);
 915         return snd_sgbuf_get_addr(sg, ofs);
 916 }
 917
 918 static inline void *
 919 snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
 920 {
 921         struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream);
 922         return snd_sgbuf_get_ptr(sg, ofs);
 923 }
 924
 925 struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream,
 926                                     unsigned long offset);
 927 unsigned int snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
 928                                           unsigned int ofs, unsigned int size);
 929
 930 /* handle mmap counter - PCM mmap callback should handle this counter properly */
 931 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
 932 {
 933         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
 934         atomic_inc(&substream->mmap_count);
 935 }
 936
 937 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
 938 {
 939         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
 940         atomic_dec(&substream->mmap_count);
 941 }
 942
 943 /* mmap for io-memory area */
 944 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
 945 #define SNDRV_PCM_INFO_MMAP_IOMEM       SNDRV_PCM_INFO_MMAP
 946 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
 947 #else
 948 #define SNDRV_PCM_INFO_MMAP_IOMEM       0
 949 #define snd_pcm_lib_mmap_iomem  NULL
 950 #endif
 951
 952 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
 953 {
 954         *max = dma < 4 ? 64 * 1024 : 128 * 1024;
 955 }
 956
 957 /*
 958  *  Misc
 959  */
 960
 961 #define SNDRV_PCM_DEFAULT_CON_SPDIF     (IEC958_AES0_CON_EMPHASIS_NONE|\
 962                                          (IEC958_AES1_CON_ORIGINAL<<8)|\
 963                                          (IEC958_AES1_CON_PCM_CODER<<8)|\
 964                                          (IEC958_AES3_CON_FS_48000<<24))
 965
 966 #define PCM_RUNTIME_CHECK(sub) snd_BUG_ON(!(sub) || !(sub)->runtime)
 967
 968 #endif /* __SOUND_PCM_H */