Pileus Git - ~andy/linux/blob - 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_hwptr_log;
 266
 267 struct snd_pcm_runtime {
 268         /* -- Status -- */
 269         struct snd_pcm_substream *trigger_master;
 270         struct timespec trigger_tstamp; /* trigger timestamp */
 271         int overrange;
 272         snd_pcm_uframes_t avail_max;
 273         snd_pcm_uframes_t hw_ptr_base;  /* Position at buffer restart */
 274         unsigned long hw_ptr_jiffies;   /* Time when hw_ptr is updated */
 275         snd_pcm_sframes_t delay;        /* extra delay; typically FIFO size */
 276
 277         /* -- HW params -- */
 278         snd_pcm_access_t access;        /* access mode */
 279         snd_pcm_format_t format;        /* SNDRV_PCM_FORMAT_* */
 280         snd_pcm_subformat_t subformat;  /* subformat */
 281         unsigned int rate;              /* rate in Hz */
 282         unsigned int channels;          /* channels */
 283         snd_pcm_uframes_t period_size;  /* period size */
 284         unsigned int periods;           /* periods */
 285         snd_pcm_uframes_t buffer_size;  /* buffer size */
 286         snd_pcm_uframes_t min_align;    /* Min alignment for the format */
 287         size_t byte_align;
 288         unsigned int frame_bits;
 289         unsigned int sample_bits;
 290         unsigned int info;
 291         unsigned int rate_num;
 292         unsigned int rate_den;
 293
 294         /* -- SW params -- */
 295         int tstamp_mode;                /* mmap timestamp is updated */
 296         unsigned int period_step;
 297         snd_pcm_uframes_t start_threshold;
 298         snd_pcm_uframes_t stop_threshold;
 299         snd_pcm_uframes_t silence_threshold; /* Silence filling happens when
 300                                                 noise is nearest than this */
 301         snd_pcm_uframes_t silence_size; /* Silence filling size */
 302         snd_pcm_uframes_t boundary;     /* pointers wrap point */
 303
 304         snd_pcm_uframes_t silence_start; /* starting pointer to silence area */
 305         snd_pcm_uframes_t silence_filled; /* size filled with silence */
 306
 307         union snd_pcm_sync_id sync;     /* hardware synchronization ID */
 308
 309         /* -- mmap -- */
 310         struct snd_pcm_mmap_status *status;
 311         struct snd_pcm_mmap_control *control;
 312
 313         /* -- locking / scheduling -- */
 314         unsigned int nowake: 1;         /* no wakeup (data-copy in progress) */
 315         wait_queue_head_t sleep;
 316         struct fasync_struct *fasync;
 317
 318         /* -- private section -- */
 319         void *private_data;
 320         void (*private_free)(struct snd_pcm_runtime *runtime);
 321
 322         /* -- hardware description -- */
 323         struct snd_pcm_hardware hw;
 324         struct snd_pcm_hw_constraints hw_constraints;
 325
 326         /* -- interrupt callbacks -- */
 327         void (*transfer_ack_begin)(struct snd_pcm_substream *substream);
 328         void (*transfer_ack_end)(struct snd_pcm_substream *substream);
 329
 330         /* -- timer -- */
 331         unsigned int timer_resolution;  /* timer resolution */
 332         int tstamp_type;                /* timestamp type */
 333
 334         /* -- DMA -- */
 335         unsigned char *dma_area;        /* DMA area */
 336         dma_addr_t dma_addr;            /* physical bus address (not accessible from main CPU) */
 337         size_t dma_bytes;               /* size of DMA area */
 338
 339         struct snd_dma_buffer *dma_buffer_p;    /* allocated buffer */
 340
 341 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 342         /* -- OSS things -- */
 343         struct snd_pcm_oss_runtime oss;
 344 #endif
 345
 346 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 347         struct snd_pcm_hwptr_log *hwptr_log;
 348 #endif
 349 };
 350
 351 struct snd_pcm_group {          /* keep linked substreams */
 352         spinlock_t lock;
 353         struct list_head substreams;
 354         int count;
 355 };
 356
 357 struct pid;
 358
 359 struct snd_pcm_substream {
 360         struct snd_pcm *pcm;
 361         struct snd_pcm_str *pstr;
 362         void *private_data;             /* copied from pcm->private_data */
 363         int number;
 364         char name[32];                  /* substream name */
 365         int stream;                     /* stream (direction) */
 366         char latency_id[20];            /* latency identifier */
 367         size_t buffer_bytes_max;        /* limit ring buffer size */
 368         struct snd_dma_buffer dma_buffer;
 369         unsigned int dma_buf_id;
 370         size_t dma_max;
 371         /* -- hardware operations -- */
 372         struct snd_pcm_ops *ops;
 373         /* -- runtime information -- */
 374         struct snd_pcm_runtime *runtime;
 375         /* -- timer section -- */
 376         struct snd_timer *timer;                /* timer */
 377         unsigned timer_running: 1;      /* time is running */
 378         /* -- next substream -- */
 379         struct snd_pcm_substream *next;
 380         /* -- linked substreams -- */
 381         struct list_head link_list;     /* linked list member */
 382         struct snd_pcm_group self_group;        /* fake group for non linked substream (with substream lock inside) */
 383         struct snd_pcm_group *group;            /* pointer to current group */
 384         /* -- assigned files -- */
 385         void *file;
 386         int ref_count;
 387         atomic_t mmap_count;
 388         unsigned int f_flags;
 389         void (*pcm_release)(struct snd_pcm_substream *);
 390         struct pid *pid;
 391 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 392         /* -- OSS things -- */
 393         struct snd_pcm_oss_substream oss;
 394 #endif
 395 #ifdef CONFIG_SND_VERBOSE_PROCFS
 396         struct snd_info_entry *proc_root;
 397         struct snd_info_entry *proc_info_entry;
 398         struct snd_info_entry *proc_hw_params_entry;
 399         struct snd_info_entry *proc_sw_params_entry;
 400         struct snd_info_entry *proc_status_entry;
 401         struct snd_info_entry *proc_prealloc_entry;
 402         struct snd_info_entry *proc_prealloc_max_entry;
 403 #endif
 404         /* misc flags */
 405         unsigned int hw_opened: 1;
 406 };
 407
 408 #define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0)
 409
 410
 411 struct snd_pcm_str {
 412         int stream;                             /* stream (direction) */
 413         struct snd_pcm *pcm;
 414         /* -- substreams -- */
 415         unsigned int substream_count;
 416         unsigned int substream_opened;
 417         struct snd_pcm_substream *substream;
 418 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 419         /* -- OSS things -- */
 420         struct snd_pcm_oss_stream oss;
 421 #endif
 422 #ifdef CONFIG_SND_VERBOSE_PROCFS
 423         struct snd_info_entry *proc_root;
 424         struct snd_info_entry *proc_info_entry;
 425 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 426         unsigned int xrun_debug;        /* 0 = disabled, 1 = verbose, 2 = stacktrace */
 427         struct snd_info_entry *proc_xrun_debug_entry;
 428 #endif
 429 #endif
 430 };
 431
 432 struct snd_pcm {
 433         struct snd_card *card;
 434         struct list_head list;
 435         int device; /* device number */
 436         unsigned int info_flags;
 437         unsigned short dev_class;
 438         unsigned short dev_subclass;
 439         char id[64];
 440         char name[80];
 441         struct snd_pcm_str streams[2];
 442         struct mutex open_mutex;
 443         wait_queue_head_t open_wait;
 444         void *private_data;
 445         void (*private_free) (struct snd_pcm *pcm);
 446         struct device *dev; /* actual hw device this belongs to */
 447 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 448         struct snd_pcm_oss oss;
 449 #endif
 450 };
 451
 452 struct snd_pcm_notify {
 453         int (*n_register) (struct snd_pcm * pcm);
 454         int (*n_disconnect) (struct snd_pcm * pcm);
 455         int (*n_unregister) (struct snd_pcm * pcm);
 456         struct list_head list;
 457 };
 458
 459 /*
 460  *  Registering
 461  */
 462
 463 extern const struct file_operations snd_pcm_f_ops[2];
 464
 465 int snd_pcm_new(struct snd_card *card, const char *id, int device,
 466                 int playback_count, int capture_count,
 467                 struct snd_pcm **rpcm);
 468 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
 469
 470 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
 471
 472 /*
 473  *  Native I/O
 474  */
 475
 476 extern rwlock_t snd_pcm_link_rwlock;
 477
 478 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
 479 int snd_pcm_info_user(struct snd_pcm_substream *substream,
 480                       struct snd_pcm_info __user *info);
 481 int snd_pcm_status(struct snd_pcm_substream *substream,
 482                    struct snd_pcm_status *status);
 483 int snd_pcm_start(struct snd_pcm_substream *substream);
 484 int snd_pcm_stop(struct snd_pcm_substream *substream, int status);
 485 int snd_pcm_drain_done(struct snd_pcm_substream *substream);
 486 #ifdef CONFIG_PM
 487 int snd_pcm_suspend(struct snd_pcm_substream *substream);
 488 int snd_pcm_suspend_all(struct snd_pcm *pcm);
 489 #endif
 490 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
 491 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
 492                            struct snd_pcm_substream **rsubstream);
 493 void snd_pcm_release_substream(struct snd_pcm_substream *substream);
 494 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
 495                              struct snd_pcm_substream **rsubstream);
 496 void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
 497 void snd_pcm_vma_notify_data(void *client, void *data);
 498 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
 499
 500 /*
 501  *  PCM library
 502  */
 503
 504 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
 505 {
 506         return substream->group != &substream->self_group;
 507 }
 508
 509 static inline void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
 510 {
 511         read_lock(&snd_pcm_link_rwlock);
 512         spin_lock(&substream->self_group.lock);
 513 }
 514
 515 static inline void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
 516 {
 517         spin_unlock(&substream->self_group.lock);
 518         read_unlock(&snd_pcm_link_rwlock);
 519 }
 520
 521 static inline void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
 522 {
 523         read_lock_irq(&snd_pcm_link_rwlock);
 524         spin_lock(&substream->self_group.lock);
 525 }
 526
 527 static inline void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
 528 {
 529         spin_unlock(&substream->self_group.lock);
 530         read_unlock_irq(&snd_pcm_link_rwlock);
 531 }
 532
 533 #define snd_pcm_stream_lock_irqsave(substream, flags) \
 534 do { \
 535         read_lock_irqsave(&snd_pcm_link_rwlock, (flags)); \
 536         spin_lock(&substream->self_group.lock); \
 537 } while (0)
 538
 539 #define snd_pcm_stream_unlock_irqrestore(substream, flags) \
 540 do { \
 541         spin_unlock(&substream->self_group.lock); \
 542         read_unlock_irqrestore(&snd_pcm_link_rwlock, (flags)); \
 543 } while (0)
 544
 545 #define snd_pcm_group_for_each_entry(s, substream) \
 546         list_for_each_entry(s, &substream->group->substreams, link_list)
 547
 548 static inline int snd_pcm_running(struct snd_pcm_substream *substream)
 549 {
 550         return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 551                 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
 552                  substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
 553 }
 554
 555 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
 556 {
 557         return size * 8 / runtime->sample_bits;
 558 }
 559
 560 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
 561 {
 562         return size * 8 / runtime->frame_bits;
 563 }
 564
 565 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
 566 {
 567         return size * runtime->sample_bits / 8;
 568 }
 569
 570 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
 571 {
 572         return size * runtime->frame_bits / 8;
 573 }
 574
 575 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
 576 {
 577         return bytes % runtime->byte_align == 0;
 578 }
 579
 580 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
 581 {
 582         struct snd_pcm_runtime *runtime = substream->runtime;
 583         return frames_to_bytes(runtime, runtime->buffer_size);
 584 }
 585
 586 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
 587 {
 588         struct snd_pcm_runtime *runtime = substream->runtime;
 589         return frames_to_bytes(runtime, runtime->period_size);
 590 }
 591
 592 /*
 593  *  result is: 0 ... (boundary - 1)
 594  */
 595 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
 596 {
 597         snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
 598         if (avail < 0)
 599                 avail += runtime->boundary;
 600         else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
 601                 avail -= runtime->boundary;
 602         return avail;
 603 }
 604
 605 /*
 606  *  result is: 0 ... (boundary - 1)
 607  */
 608 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
 609 {
 610         snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
 611         if (avail < 0)
 612                 avail += runtime->boundary;
 613         return avail;
 614 }
 615
 616 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
 617 {
 618         return runtime->buffer_size - snd_pcm_playback_avail(runtime);
 619 }
 620
 621 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
 622 {
 623         return runtime->buffer_size - snd_pcm_capture_avail(runtime);
 624 }
 625
 626 /**
 627  * snd_pcm_playback_ready - check whether the playback buffer is available
 628  * @substream: the pcm substream instance
 629  *
 630  * Checks whether enough free space is available on the playback buffer.
 631  *
 632  * Returns non-zero if available, or zero if not.
 633  */
 634 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
 635 {
 636         struct snd_pcm_runtime *runtime = substream->runtime;
 637         return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
 638 }
 639
 640 /**
 641  * snd_pcm_capture_ready - check whether the capture buffer is available
 642  * @substream: the pcm substream instance
 643  *
 644  * Checks whether enough capture data is available on the capture buffer.
 645  *
 646  * Returns non-zero if available, or zero if not.
 647  */
 648 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
 649 {
 650         struct snd_pcm_runtime *runtime = substream->runtime;
 651         return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
 652 }
 653
 654 /**
 655  * snd_pcm_playback_data - check whether any data exists on the playback buffer
 656  * @substream: the pcm substream instance
 657  *
 658  * Checks whether any data exists on the playback buffer. If stop_threshold
 659  * is bigger or equal to boundary, then this function returns always non-zero.
 660  *
 661  * Returns non-zero if exists, or zero if not.
 662  */
 663 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
 664 {
 665         struct snd_pcm_runtime *runtime = substream->runtime;
 666
 667         if (runtime->stop_threshold >= runtime->boundary)
 668                 return 1;
 669         return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
 670 }
 671
 672 /**
 673  * snd_pcm_playback_empty - check whether the playback buffer is empty
 674  * @substream: the pcm substream instance
 675  *
 676  * Checks whether the playback buffer is empty.
 677  *
 678  * Returns non-zero if empty, or zero if not.
 679  */
 680 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
 681 {
 682         struct snd_pcm_runtime *runtime = substream->runtime;
 683         return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
 684 }
 685
 686 /**
 687  * snd_pcm_capture_empty - check whether the capture buffer is empty
 688  * @substream: the pcm substream instance
 689  *
 690  * Checks whether the capture buffer is empty.
 691  *
 692  * Returns non-zero if empty, or zero if not.
 693  */
 694 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
 695 {
 696         struct snd_pcm_runtime *runtime = substream->runtime;
 697         return snd_pcm_capture_avail(runtime) == 0;
 698 }
 699
 700 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream,
 701                                         struct snd_pcm_substream *master)
 702 {
 703         substream->runtime->trigger_master = master;
 704 }
 705
 706 static inline int hw_is_mask(int var)
 707 {
 708         return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
 709                 var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
 710 }
 711
 712 static inline int hw_is_interval(int var)
 713 {
 714         return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
 715                 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
 716 }
 717
 718 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
 719                                      snd_pcm_hw_param_t var)
 720 {
 721         return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 722 }
 723
 724 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
 725                                              snd_pcm_hw_param_t var)
 726 {
 727         return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 728 }
 729
 730 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
 731                                              snd_pcm_hw_param_t var)
 732 {
 733         return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 734 }
 735
 736 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
 737                                                      snd_pcm_hw_param_t var)
 738 {
 739         return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 740 }
 741
 742 #define params_access(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_ACCESS))
 743 #define params_format(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_FORMAT))
 744 #define params_subformat(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_SUBFORMAT))
 745 #define params_channels(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_CHANNELS)->min
 746 #define params_rate(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_RATE)->min
 747 #define params_period_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min
 748 #define params_period_bytes(p) ((params_period_size(p)*snd_pcm_format_physical_width(params_format(p))*params_channels(p))/8)
 749 #define params_periods(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIODS)->min
 750 #define params_buffer_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min
 751 #define params_buffer_bytes(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min
 752
 753
 754 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
 755 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
 756 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
 757 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
 758                           unsigned int k, struct snd_interval *c);
 759 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
 760                           const struct snd_interval *b, struct snd_interval *c);
 761 int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask);
 762 int snd_interval_ratnum(struct snd_interval *i,
 763                         unsigned int rats_count, struct snd_ratnum *rats,
 764                         unsigned int *nump, unsigned int *denp);
 765
 766 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
 767 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
 768 int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
 769
 770 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
 771
 772 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream);
 773 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream);
 774
 775 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 776                                u_int32_t mask);
 777 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 778                                  u_int64_t mask);
 779 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 780                                  unsigned int min, unsigned int max);
 781 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
 782 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
 783                                unsigned int cond,
 784                                snd_pcm_hw_param_t var,
 785                                struct snd_pcm_hw_constraint_list *l);
 786 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
 787                                   unsigned int cond,
 788                                   snd_pcm_hw_param_t var,
 789                                   struct snd_pcm_hw_constraint_ratnums *r);
 790 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
 791                                   unsigned int cond,
 792                                   snd_pcm_hw_param_t var,
 793                                   struct snd_pcm_hw_constraint_ratdens *r);
 794 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
 795                                  unsigned int cond,
 796                                  unsigned int width,
 797                                  unsigned int msbits);
 798 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
 799                                unsigned int cond,
 800                                snd_pcm_hw_param_t var,
 801                                unsigned long step);
 802 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
 803                                unsigned int cond,
 804                                snd_pcm_hw_param_t var);
 805 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
 806                         unsigned int cond,
 807                         int var,
 808                         snd_pcm_hw_rule_func_t func, void *private,
 809                         int dep, ...);
 810
 811 int snd_pcm_format_signed(snd_pcm_format_t format);
 812 int snd_pcm_format_unsigned(snd_pcm_format_t format);
 813 int snd_pcm_format_linear(snd_pcm_format_t format);
 814 int snd_pcm_format_little_endian(snd_pcm_format_t format);
 815 int snd_pcm_format_big_endian(snd_pcm_format_t format);
 816 #if 0 /* just for DocBook */
 817 /**
 818  * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
 819  * @format: the format to check
 820  *
 821  * Returns 1 if the given PCM format is CPU-endian, 0 if
 822  * opposite, or a negative error code if endian not specified.
 823  */
 824 int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
 825 #endif /* DocBook */
 826 #ifdef SNDRV_LITTLE_ENDIAN
 827 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
 828 #else
 829 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
 830 #endif
 831 int snd_pcm_format_width(snd_pcm_format_t format);                      /* in bits */
 832 int snd_pcm_format_physical_width(snd_pcm_format_t format);             /* in bits */
 833 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
 834 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
 835 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
 836 snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsignd, int big_endian);
 837
 838 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction, struct snd_pcm_ops *ops);
 839 void snd_pcm_set_sync(struct snd_pcm_substream *substream);
 840 int snd_pcm_lib_interleave_len(struct snd_pcm_substream *substream);
 841 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
 842                       unsigned int cmd, void *arg);
 843 int snd_pcm_update_state(struct snd_pcm_substream *substream,
 844                          struct snd_pcm_runtime *runtime);
 845 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream);
 846 int snd_pcm_playback_xrun_check(struct snd_pcm_substream *substream);
 847 int snd_pcm_capture_xrun_check(struct snd_pcm_substream *substream);
 848 int snd_pcm_playback_xrun_asap(struct snd_pcm_substream *substream);
 849 int snd_pcm_capture_xrun_asap(struct snd_pcm_substream *substream);
 850 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr);
 851 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
 852 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream,
 853                                     const void __user *buf,
 854                                     snd_pcm_uframes_t frames);
 855 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream,
 856                                    void __user *buf, snd_pcm_uframes_t frames);
 857 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
 858                                      void __user **bufs, snd_pcm_uframes_t frames);
 859 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
 860                                     void __user **bufs, snd_pcm_uframes_t frames);
 861
 862 extern const struct snd_pcm_hw_constraint_list snd_pcm_known_rates;
 863
 864 int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime);
 865 unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate);
 866
 867 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
 868                                               struct snd_dma_buffer *bufp)
 869 {
 870         struct snd_pcm_runtime *runtime = substream->runtime;
 871         if (bufp) {
 872                 runtime->dma_buffer_p = bufp;
 873                 runtime->dma_area = bufp->area;
 874                 runtime->dma_addr = bufp->addr;
 875                 runtime->dma_bytes = bufp->bytes;
 876         } else {
 877                 runtime->dma_buffer_p = NULL;
 878                 runtime->dma_area = NULL;
 879                 runtime->dma_addr = 0;
 880                 runtime->dma_bytes = 0;
 881         }
 882 }
 883
 884 /*
 885  *  Timer interface
 886  */
 887
 888 void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream);
 889 void snd_pcm_timer_init(struct snd_pcm_substream *substream);
 890 void snd_pcm_timer_done(struct snd_pcm_substream *substream);
 891
 892 static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime,
 893                                    struct timespec *tv)
 894 {
 895         if (runtime->tstamp_type == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
 896                 do_posix_clock_monotonic_gettime(tv);
 897         else
 898                 getnstimeofday(tv);
 899 }
 900
 901 /*
 902  *  Memory
 903  */
 904
 905 int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
 906 int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
 907 int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
 908                                   int type, struct device *data,
 909                                   size_t size, size_t max);
 910 int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
 911                                           int type, void *data,
 912                                           size_t size, size_t max);
 913 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
 914 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
 915
 916 int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream,
 917                                       size_t size, gfp_t gfp_flags);
 918 int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream);
 919 struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream,
 920                                           unsigned long offset);
 921 #if 0 /* for kernel-doc */
 922 /**
 923  * snd_pcm_lib_alloc_vmalloc_buffer - allocate virtual DMA buffer
 924  * @substream: the substream to allocate the buffer to
 925  * @size: the requested buffer size, in bytes
 926  *
 927  * Allocates the PCM substream buffer using vmalloc(), i.e., the memory is
 928  * contiguous in kernel virtual space, but not in physical memory.  Use this
 929  * if the buffer is accessed by kernel code but not by device DMA.
 930  *
 931  * Returns 1 if the buffer was changed, 0 if not changed, or a negative error
 932  * code.
 933  */
 934 static int snd_pcm_lib_alloc_vmalloc_buffer
 935                         (struct snd_pcm_substream *substream, size_t size);
 936 /**
 937  * snd_pcm_lib_alloc_vmalloc_32_buffer - allocate 32-bit-addressable buffer
 938  * @substream: the substream to allocate the buffer to
 939  * @size: the requested buffer size, in bytes
 940  *
 941  * This function works like snd_pcm_lib_alloc_vmalloc_buffer(), but uses
 942  * vmalloc_32(), i.e., the pages are allocated from 32-bit-addressable memory.
 943  */
 944 static int snd_pcm_lib_alloc_vmalloc_32_buffer
 945                         (struct snd_pcm_substream *substream, size_t size);
 946 #endif
 947 #define snd_pcm_lib_alloc_vmalloc_buffer(subs, size) \
 948         _snd_pcm_lib_alloc_vmalloc_buffer \
 949                         (subs, size, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO)
 950 #define snd_pcm_lib_alloc_vmalloc_32_buffer(subs, size) \
 951         _snd_pcm_lib_alloc_vmalloc_buffer \
 952                         (subs, size, GFP_KERNEL | GFP_DMA32 | __GFP_ZERO)
 953
 954 #ifdef CONFIG_SND_DMA_SGBUF
 955 /*
 956  * SG-buffer handling
 957  */
 958 #define snd_pcm_substream_sgbuf(substream) \
 959         ((substream)->runtime->dma_buffer_p->private_data)
 960
 961 static inline dma_addr_t
 962 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
 963 {
 964         struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream);
 965         return snd_sgbuf_get_addr(sg, ofs);
 966 }
 967
 968 static inline void *
 969 snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
 970 {
 971         struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream);
 972         return snd_sgbuf_get_ptr(sg, ofs);
 973 }
 974
 975 struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream,
 976                                     unsigned long offset);
 977 unsigned int snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
 978                                           unsigned int ofs, unsigned int size);
 979
 980 #else /* !SND_DMA_SGBUF */
 981 /*
 982  * fake using a continuous buffer
 983  */
 984 static inline dma_addr_t
 985 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
 986 {
 987         return substream->runtime->dma_addr + ofs;
 988 }
 989
 990 static inline void *
 991 snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
 992 {
 993         return substream->runtime->dma_area + ofs;
 994 }
 995
 996 #define snd_pcm_sgbuf_ops_page  NULL
 997
 998 #define snd_pcm_sgbuf_get_chunk_size(subs, ofs, size)   (size)
 999
1000 #endif /* SND_DMA_SGBUF */
1001
1002 /* handle mmap counter - PCM mmap callback should handle this counter properly */
1003 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
1004 {
1005         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1006         atomic_inc(&substream->mmap_count);
1007 }
1008
1009 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
1010 {
1011         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1012         atomic_dec(&substream->mmap_count);
1013 }
1014
1015 /* mmap for io-memory area */
1016 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
1017 #define SNDRV_PCM_INFO_MMAP_IOMEM       SNDRV_PCM_INFO_MMAP
1018 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
1019 #else
1020 #define SNDRV_PCM_INFO_MMAP_IOMEM       0
1021 #define snd_pcm_lib_mmap_iomem  NULL
1022 #endif
1023
1024 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
1025 {
1026         *max = dma < 4 ? 64 * 1024 : 128 * 1024;
1027 }
1028
1029 /*
1030  *  Misc
1031  */
1032
1033 #define SNDRV_PCM_DEFAULT_CON_SPDIF     (IEC958_AES0_CON_EMPHASIS_NONE|\
1034                                          (IEC958_AES1_CON_ORIGINAL<<8)|\
1035                                          (IEC958_AES1_CON_PCM_CODER<<8)|\
1036                                          (IEC958_AES3_CON_FS_48000<<24))
1037
1038 #define PCM_RUNTIME_CHECK(sub) snd_BUG_ON(!(sub) || !(sub)->runtime)
1039
1040 const char *snd_pcm_format_name(snd_pcm_format_t format);
1041
1042 #endif /* __SOUND_PCM_H */