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 <linux/poll.h>
  29 #include <linux/mm.h>
  30 #include <linux/bitops.h>
  31
  32 #define snd_pcm_substream_chip(substream) ((substream)->private_data)
  33 #define snd_pcm_chip(pcm) ((pcm)->private_data)
  34
  35 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
  36 #include "pcm_oss.h"
  37 #endif
  38
  39 /*
  40  *  Hardware (lowlevel) section
  41  */
  42
  43 struct snd_pcm_hardware {
  44         unsigned int info;              /* SNDRV_PCM_INFO_* */
  45         u64 formats;                    /* SNDRV_PCM_FMTBIT_* */
  46         unsigned int rates;             /* SNDRV_PCM_RATE_* */
  47         unsigned int rate_min;          /* min rate */
  48         unsigned int rate_max;          /* max rate */
  49         unsigned int channels_min;      /* min channels */
  50         unsigned int channels_max;      /* max channels */
  51         size_t buffer_bytes_max;        /* max buffer size */
  52         size_t period_bytes_min;        /* min period size */
  53         size_t period_bytes_max;        /* max period size */
  54         unsigned int periods_min;       /* min # of periods */
  55         unsigned int periods_max;       /* max # of periods */
  56         size_t fifo_size;               /* fifo size in bytes */
  57 };
  58
  59 struct snd_pcm_substream;
  60
  61 struct snd_pcm_ops {
  62         int (*open)(struct snd_pcm_substream *substream);
  63         int (*close)(struct snd_pcm_substream *substream);
  64         int (*ioctl)(struct snd_pcm_substream * substream,
  65                      unsigned int cmd, void *arg);
  66         int (*hw_params)(struct snd_pcm_substream *substream,
  67                          struct snd_pcm_hw_params *params);
  68         int (*hw_free)(struct snd_pcm_substream *substream);
  69         int (*prepare)(struct snd_pcm_substream *substream);
  70         int (*trigger)(struct snd_pcm_substream *substream, int cmd);
  71         snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *substream);
  72         int (*copy)(struct snd_pcm_substream *substream, int channel,
  73                     snd_pcm_uframes_t pos,
  74                     void __user *buf, snd_pcm_uframes_t count);
  75         int (*silence)(struct snd_pcm_substream *substream, int channel,
  76                        snd_pcm_uframes_t pos, snd_pcm_uframes_t count);
  77         struct page *(*page)(struct snd_pcm_substream *substream,
  78                              unsigned long offset);
  79         int (*mmap)(struct snd_pcm_substream *substream, struct vm_area_struct *vma);
  80         int (*ack)(struct snd_pcm_substream *substream);
  81 };
  82
  83 /*
  84  *
  85  */
  86
  87 #define SNDRV_PCM_IOCTL1_FALSE          ((void *)0)
  88 #define SNDRV_PCM_IOCTL1_TRUE           ((void *)1)
  89
  90 #define SNDRV_PCM_IOCTL1_RESET          0
  91 #define SNDRV_PCM_IOCTL1_INFO           1
  92 #define SNDRV_PCM_IOCTL1_CHANNEL_INFO   2
  93 #define SNDRV_PCM_IOCTL1_GSTATE         3
  94
  95 #define SNDRV_PCM_TRIGGER_STOP          0
  96 #define SNDRV_PCM_TRIGGER_START         1
  97 #define SNDRV_PCM_TRIGGER_PAUSE_PUSH    3
  98 #define SNDRV_PCM_TRIGGER_PAUSE_RELEASE 4
  99 #define SNDRV_PCM_TRIGGER_SUSPEND       5
 100 #define SNDRV_PCM_TRIGGER_RESUME        6
 101
 102 #define SNDRV_PCM_POS_XRUN              ((snd_pcm_uframes_t)-1)
 103
 104 /* If you change this don't forget to change rates[] table in pcm_native.c */
 105 #define SNDRV_PCM_RATE_5512             (1<<0)          /* 5512Hz */
 106 #define SNDRV_PCM_RATE_8000             (1<<1)          /* 8000Hz */
 107 #define SNDRV_PCM_RATE_11025            (1<<2)          /* 11025Hz */
 108 #define SNDRV_PCM_RATE_16000            (1<<3)          /* 16000Hz */
 109 #define SNDRV_PCM_RATE_22050            (1<<4)          /* 22050Hz */
 110 #define SNDRV_PCM_RATE_32000            (1<<5)          /* 32000Hz */
 111 #define SNDRV_PCM_RATE_44100            (1<<6)          /* 44100Hz */
 112 #define SNDRV_PCM_RATE_48000            (1<<7)          /* 48000Hz */
 113 #define SNDRV_PCM_RATE_64000            (1<<8)          /* 64000Hz */
 114 #define SNDRV_PCM_RATE_88200            (1<<9)          /* 88200Hz */
 115 #define SNDRV_PCM_RATE_96000            (1<<10)         /* 96000Hz */
 116 #define SNDRV_PCM_RATE_176400           (1<<11)         /* 176400Hz */
 117 #define SNDRV_PCM_RATE_192000           (1<<12)         /* 192000Hz */
 118
 119 #define SNDRV_PCM_RATE_CONTINUOUS       (1<<30)         /* continuous range */
 120 #define SNDRV_PCM_RATE_KNOT             (1<<31)         /* supports more non-continuos rates */
 121
 122 #define SNDRV_PCM_RATE_8000_44100       (SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_11025|\
 123                                          SNDRV_PCM_RATE_16000|SNDRV_PCM_RATE_22050|\
 124                                          SNDRV_PCM_RATE_32000|SNDRV_PCM_RATE_44100)
 125 #define SNDRV_PCM_RATE_8000_48000       (SNDRV_PCM_RATE_8000_44100|SNDRV_PCM_RATE_48000)
 126 #define SNDRV_PCM_RATE_8000_96000       (SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_64000|\
 127                                          SNDRV_PCM_RATE_88200|SNDRV_PCM_RATE_96000)
 128 #define SNDRV_PCM_RATE_8000_192000      (SNDRV_PCM_RATE_8000_96000|SNDRV_PCM_RATE_176400|\
 129                                          SNDRV_PCM_RATE_192000)
 130 #define SNDRV_PCM_FMTBIT_S8             (1ULL << SNDRV_PCM_FORMAT_S8)
 131 #define SNDRV_PCM_FMTBIT_U8             (1ULL << SNDRV_PCM_FORMAT_U8)
 132 #define SNDRV_PCM_FMTBIT_S16_LE         (1ULL << SNDRV_PCM_FORMAT_S16_LE)
 133 #define SNDRV_PCM_FMTBIT_S16_BE         (1ULL << SNDRV_PCM_FORMAT_S16_BE)
 134 #define SNDRV_PCM_FMTBIT_U16_LE         (1ULL << SNDRV_PCM_FORMAT_U16_LE)
 135 #define SNDRV_PCM_FMTBIT_U16_BE         (1ULL << SNDRV_PCM_FORMAT_U16_BE)
 136 #define SNDRV_PCM_FMTBIT_S24_LE         (1ULL << SNDRV_PCM_FORMAT_S24_LE)
 137 #define SNDRV_PCM_FMTBIT_S24_BE         (1ULL << SNDRV_PCM_FORMAT_S24_BE)
 138 #define SNDRV_PCM_FMTBIT_U24_LE         (1ULL << SNDRV_PCM_FORMAT_U24_LE)
 139 #define SNDRV_PCM_FMTBIT_U24_BE         (1ULL << SNDRV_PCM_FORMAT_U24_BE)
 140 #define SNDRV_PCM_FMTBIT_S32_LE         (1ULL << SNDRV_PCM_FORMAT_S32_LE)
 141 #define SNDRV_PCM_FMTBIT_S32_BE         (1ULL << SNDRV_PCM_FORMAT_S32_BE)
 142 #define SNDRV_PCM_FMTBIT_U32_LE         (1ULL << SNDRV_PCM_FORMAT_U32_LE)
 143 #define SNDRV_PCM_FMTBIT_U32_BE         (1ULL << SNDRV_PCM_FORMAT_U32_BE)
 144 #define SNDRV_PCM_FMTBIT_FLOAT_LE       (1ULL << SNDRV_PCM_FORMAT_FLOAT_LE)
 145 #define SNDRV_PCM_FMTBIT_FLOAT_BE       (1ULL << SNDRV_PCM_FORMAT_FLOAT_BE)
 146 #define SNDRV_PCM_FMTBIT_FLOAT64_LE     (1ULL << SNDRV_PCM_FORMAT_FLOAT64_LE)
 147 #define SNDRV_PCM_FMTBIT_FLOAT64_BE     (1ULL << SNDRV_PCM_FORMAT_FLOAT64_BE)
 148 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE (1ULL << SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE)
 149 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE (1ULL << SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE)
 150 #define SNDRV_PCM_FMTBIT_MU_LAW         (1ULL << SNDRV_PCM_FORMAT_MU_LAW)
 151 #define SNDRV_PCM_FMTBIT_A_LAW          (1ULL << SNDRV_PCM_FORMAT_A_LAW)
 152 #define SNDRV_PCM_FMTBIT_IMA_ADPCM      (1ULL << SNDRV_PCM_FORMAT_IMA_ADPCM)
 153 #define SNDRV_PCM_FMTBIT_MPEG           (1ULL << SNDRV_PCM_FORMAT_MPEG)
 154 #define SNDRV_PCM_FMTBIT_GSM            (1ULL << SNDRV_PCM_FORMAT_GSM)
 155 #define SNDRV_PCM_FMTBIT_SPECIAL        (1ULL << SNDRV_PCM_FORMAT_SPECIAL)
 156 #define SNDRV_PCM_FMTBIT_S24_3LE        (1ULL << SNDRV_PCM_FORMAT_S24_3LE)
 157 #define SNDRV_PCM_FMTBIT_U24_3LE        (1ULL << SNDRV_PCM_FORMAT_U24_3LE)
 158 #define SNDRV_PCM_FMTBIT_S24_3BE        (1ULL << SNDRV_PCM_FORMAT_S24_3BE)
 159 #define SNDRV_PCM_FMTBIT_U24_3BE        (1ULL << SNDRV_PCM_FORMAT_U24_3BE)
 160 #define SNDRV_PCM_FMTBIT_S20_3LE        (1ULL << SNDRV_PCM_FORMAT_S20_3LE)
 161 #define SNDRV_PCM_FMTBIT_U20_3LE        (1ULL << SNDRV_PCM_FORMAT_U20_3LE)
 162 #define SNDRV_PCM_FMTBIT_S20_3BE        (1ULL << SNDRV_PCM_FORMAT_S20_3BE)
 163 #define SNDRV_PCM_FMTBIT_U20_3BE        (1ULL << SNDRV_PCM_FORMAT_U20_3BE)
 164 #define SNDRV_PCM_FMTBIT_S18_3LE        (1ULL << SNDRV_PCM_FORMAT_S18_3LE)
 165 #define SNDRV_PCM_FMTBIT_U18_3LE        (1ULL << SNDRV_PCM_FORMAT_U18_3LE)
 166 #define SNDRV_PCM_FMTBIT_S18_3BE        (1ULL << SNDRV_PCM_FORMAT_S18_3BE)
 167 #define SNDRV_PCM_FMTBIT_U18_3BE        (1ULL << SNDRV_PCM_FORMAT_U18_3BE)
 168
 169 #ifdef SNDRV_LITTLE_ENDIAN
 170 #define SNDRV_PCM_FMTBIT_S16            SNDRV_PCM_FMTBIT_S16_LE
 171 #define SNDRV_PCM_FMTBIT_U16            SNDRV_PCM_FMTBIT_U16_LE
 172 #define SNDRV_PCM_FMTBIT_S24            SNDRV_PCM_FMTBIT_S24_LE
 173 #define SNDRV_PCM_FMTBIT_U24            SNDRV_PCM_FMTBIT_U24_LE
 174 #define SNDRV_PCM_FMTBIT_S32            SNDRV_PCM_FMTBIT_S32_LE
 175 #define SNDRV_PCM_FMTBIT_U32            SNDRV_PCM_FMTBIT_U32_LE
 176 #define SNDRV_PCM_FMTBIT_FLOAT          SNDRV_PCM_FMTBIT_FLOAT_LE
 177 #define SNDRV_PCM_FMTBIT_FLOAT64        SNDRV_PCM_FMTBIT_FLOAT64_LE
 178 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE
 179 #endif
 180 #ifdef SNDRV_BIG_ENDIAN
 181 #define SNDRV_PCM_FMTBIT_S16            SNDRV_PCM_FMTBIT_S16_BE
 182 #define SNDRV_PCM_FMTBIT_U16            SNDRV_PCM_FMTBIT_U16_BE
 183 #define SNDRV_PCM_FMTBIT_S24            SNDRV_PCM_FMTBIT_S24_BE
 184 #define SNDRV_PCM_FMTBIT_U24            SNDRV_PCM_FMTBIT_U24_BE
 185 #define SNDRV_PCM_FMTBIT_S32            SNDRV_PCM_FMTBIT_S32_BE
 186 #define SNDRV_PCM_FMTBIT_U32            SNDRV_PCM_FMTBIT_U32_BE
 187 #define SNDRV_PCM_FMTBIT_FLOAT          SNDRV_PCM_FMTBIT_FLOAT_BE
 188 #define SNDRV_PCM_FMTBIT_FLOAT64        SNDRV_PCM_FMTBIT_FLOAT64_BE
 189 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE
 190 #endif
 191
 192 struct snd_pcm_file {
 193         struct snd_pcm_substream *substream;
 194         int no_compat_mmap;
 195 };
 196
 197 struct snd_pcm_hw_rule;
 198 typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params,
 199                                       struct snd_pcm_hw_rule *rule);
 200
 201 struct snd_pcm_hw_rule {
 202         unsigned int cond;
 203         snd_pcm_hw_rule_func_t func;
 204         int var;
 205         int deps[4];
 206         void *private;
 207 };
 208
 209 struct snd_pcm_hw_constraints {
 210         struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK -
 211                          SNDRV_PCM_HW_PARAM_FIRST_MASK + 1];
 212         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL -
 213                              SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
 214         unsigned int rules_num;
 215         unsigned int rules_all;
 216         struct snd_pcm_hw_rule *rules;
 217 };
 218
 219 static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs,
 220                                             snd_pcm_hw_param_t var)
 221 {
 222         return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 223 }
 224
 225 static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs,
 226                                                     snd_pcm_hw_param_t var)
 227 {
 228         return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 229 }
 230
 231 struct snd_ratnum {
 232         unsigned int num;
 233         unsigned int den_min, den_max, den_step;
 234 };
 235
 236 struct snd_ratden {
 237         unsigned int num_min, num_max, num_step;
 238         unsigned int den;
 239 };
 240
 241 struct snd_pcm_hw_constraint_ratnums {
 242         int nrats;
 243         struct snd_ratnum *rats;
 244 };
 245
 246 struct snd_pcm_hw_constraint_ratdens {
 247         int nrats;
 248         struct snd_ratden *rats;
 249 };
 250
 251 struct snd_pcm_hw_constraint_list {
 252         unsigned int count;
 253         unsigned int *list;
 254         unsigned int mask;
 255 };
 256
 257 struct snd_pcm_runtime {
 258         /* -- Status -- */
 259         struct snd_pcm_substream *trigger_master;
 260         struct timespec trigger_tstamp; /* trigger timestamp */
 261         int overrange;
 262         snd_pcm_uframes_t avail_max;
 263         snd_pcm_uframes_t hw_ptr_base;  /* Position at buffer restart */
 264         snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time*/
 265
 266         /* -- HW params -- */
 267         snd_pcm_access_t access;        /* access mode */
 268         snd_pcm_format_t format;        /* SNDRV_PCM_FORMAT_* */
 269         snd_pcm_subformat_t subformat;  /* subformat */
 270         unsigned int rate;              /* rate in Hz */
 271         unsigned int channels;          /* channels */
 272         snd_pcm_uframes_t period_size;  /* period size */
 273         unsigned int periods;           /* periods */
 274         snd_pcm_uframes_t buffer_size;  /* buffer size */
 275         snd_pcm_uframes_t min_align;    /* Min alignment for the format */
 276         size_t byte_align;
 277         unsigned int frame_bits;
 278         unsigned int sample_bits;
 279         unsigned int info;
 280         unsigned int rate_num;
 281         unsigned int rate_den;
 282
 283         /* -- SW params -- */
 284         int tstamp_mode;                /* mmap timestamp is updated */
 285         unsigned int period_step;
 286         snd_pcm_uframes_t start_threshold;
 287         snd_pcm_uframes_t stop_threshold;
 288         snd_pcm_uframes_t silence_threshold; /* Silence filling happens when
 289                                                 noise is nearest than this */
 290         snd_pcm_uframes_t silence_size; /* Silence filling size */
 291         snd_pcm_uframes_t boundary;     /* pointers wrap point */
 292
 293         snd_pcm_uframes_t silence_start; /* starting pointer to silence area */
 294         snd_pcm_uframes_t silence_filled; /* size filled with silence */
 295
 296         union snd_pcm_sync_id sync;     /* hardware synchronization ID */
 297
 298         /* -- mmap -- */
 299         struct snd_pcm_mmap_status *status;
 300         struct snd_pcm_mmap_control *control;
 301
 302         /* -- locking / scheduling -- */
 303         wait_queue_head_t sleep;
 304         struct fasync_struct *fasync;
 305
 306         /* -- private section -- */
 307         void *private_data;
 308         void (*private_free)(struct snd_pcm_runtime *runtime);
 309
 310         /* -- hardware description -- */
 311         struct snd_pcm_hardware hw;
 312         struct snd_pcm_hw_constraints hw_constraints;
 313
 314         /* -- interrupt callbacks -- */
 315         void (*transfer_ack_begin)(struct snd_pcm_substream *substream);
 316         void (*transfer_ack_end)(struct snd_pcm_substream *substream);
 317
 318         /* -- timer -- */
 319         unsigned int timer_resolution;  /* timer resolution */
 320         int tstamp_type;                /* timestamp type */
 321
 322         /* -- DMA -- */
 323         unsigned char *dma_area;        /* DMA area */
 324         dma_addr_t dma_addr;            /* physical bus address (not accessible from main CPU) */
 325         size_t dma_bytes;               /* size of DMA area */
 326
 327         struct snd_dma_buffer *dma_buffer_p;    /* allocated buffer */
 328
 329 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 330         /* -- OSS things -- */
 331         struct snd_pcm_oss_runtime oss;
 332 #endif
 333 };
 334
 335 struct snd_pcm_group {          /* keep linked substreams */
 336         spinlock_t lock;
 337         struct list_head substreams;
 338         int count;
 339 };
 340
 341 struct snd_pcm_substream {
 342         struct snd_pcm *pcm;
 343         struct snd_pcm_str *pstr;
 344         void *private_data;             /* copied from pcm->private_data */
 345         int number;
 346         char name[32];                  /* substream name */
 347         int stream;                     /* stream (direction) */
 348         char latency_id[20];            /* latency identifier */
 349         size_t buffer_bytes_max;        /* limit ring buffer size */
 350         struct snd_dma_buffer dma_buffer;
 351         unsigned int dma_buf_id;
 352         size_t dma_max;
 353         /* -- hardware operations -- */
 354         struct snd_pcm_ops *ops;
 355         /* -- runtime information -- */
 356         struct snd_pcm_runtime *runtime;
 357         /* -- timer section -- */
 358         struct snd_timer *timer;                /* timer */
 359         unsigned timer_running: 1;      /* time is running */
 360         spinlock_t timer_lock;
 361         /* -- next substream -- */
 362         struct snd_pcm_substream *next;
 363         /* -- linked substreams -- */
 364         struct list_head link_list;     /* linked list member */
 365         struct snd_pcm_group self_group;        /* fake group for non linked substream (with substream lock inside) */
 366         struct snd_pcm_group *group;            /* pointer to current group */
 367         /* -- assigned files -- */
 368         void *file;
 369         int ref_count;
 370         atomic_t mmap_count;
 371         unsigned int f_flags;
 372         void (*pcm_release)(struct snd_pcm_substream *);
 373 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 374         /* -- OSS things -- */
 375         struct snd_pcm_oss_substream oss;
 376 #endif
 377 #ifdef CONFIG_SND_VERBOSE_PROCFS
 378         struct snd_info_entry *proc_root;
 379         struct snd_info_entry *proc_info_entry;
 380         struct snd_info_entry *proc_hw_params_entry;
 381         struct snd_info_entry *proc_sw_params_entry;
 382         struct snd_info_entry *proc_status_entry;
 383         struct snd_info_entry *proc_prealloc_entry;
 384         struct snd_info_entry *proc_prealloc_max_entry;
 385 #endif
 386         /* misc flags */
 387         unsigned int hw_opened: 1;
 388 };
 389
 390 #define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0)
 391
 392
 393 struct snd_pcm_str {
 394         int stream;                             /* stream (direction) */
 395         struct snd_pcm *pcm;
 396         /* -- substreams -- */
 397         unsigned int substream_count;
 398         unsigned int substream_opened;
 399         struct snd_pcm_substream *substream;
 400 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 401         /* -- OSS things -- */
 402         struct snd_pcm_oss_stream oss;
 403 #endif
 404 #ifdef CONFIG_SND_VERBOSE_PROCFS
 405         struct snd_info_entry *proc_root;
 406         struct snd_info_entry *proc_info_entry;
 407 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 408         unsigned int xrun_debug;        /* 0 = disabled, 1 = verbose, 2 = stacktrace */
 409         struct snd_info_entry *proc_xrun_debug_entry;
 410 #endif
 411 #endif
 412 };
 413
 414 struct snd_pcm {
 415         struct snd_card *card;
 416         struct list_head list;
 417         int device; /* device number */
 418         unsigned int info_flags;
 419         unsigned short dev_class;
 420         unsigned short dev_subclass;
 421         char id[64];
 422         char name[80];
 423         struct snd_pcm_str streams[2];
 424         struct mutex open_mutex;
 425         wait_queue_head_t open_wait;
 426         void *private_data;
 427         void (*private_free) (struct snd_pcm *pcm);
 428         struct device *dev; /* actual hw device this belongs to */
 429 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 430         struct snd_pcm_oss oss;
 431 #endif
 432 };
 433
 434 struct snd_pcm_notify {
 435         int (*n_register) (struct snd_pcm * pcm);
 436         int (*n_disconnect) (struct snd_pcm * pcm);
 437         int (*n_unregister) (struct snd_pcm * pcm);
 438         struct list_head list;
 439 };
 440
 441 /*
 442  *  Registering
 443  */
 444
 445 extern const struct file_operations snd_pcm_f_ops[2];
 446
 447 int snd_pcm_new(struct snd_card *card, char *id, int device,
 448                 int playback_count, int capture_count,
 449                 struct snd_pcm **rpcm);
 450 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
 451
 452 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
 453
 454 /*
 455  *  Native I/O
 456  */
 457
 458 extern rwlock_t snd_pcm_link_rwlock;
 459
 460 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
 461 int snd_pcm_info_user(struct snd_pcm_substream *substream,
 462                       struct snd_pcm_info __user *info);
 463 int snd_pcm_status(struct snd_pcm_substream *substream,
 464                    struct snd_pcm_status *status);
 465 int snd_pcm_start(struct snd_pcm_substream *substream);
 466 int snd_pcm_stop(struct snd_pcm_substream *substream, int status);
 467 int snd_pcm_drain_done(struct snd_pcm_substream *substream);
 468 #ifdef CONFIG_PM
 469 int snd_pcm_suspend(struct snd_pcm_substream *substream);
 470 int snd_pcm_suspend_all(struct snd_pcm *pcm);
 471 #endif
 472 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
 473 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
 474                            struct snd_pcm_substream **rsubstream);
 475 void snd_pcm_release_substream(struct snd_pcm_substream *substream);
 476 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
 477                              struct snd_pcm_substream **rsubstream);
 478 void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
 479 void snd_pcm_vma_notify_data(void *client, void *data);
 480 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
 481
 482 #if BITS_PER_LONG >= 64
 483
 484 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
 485 {
 486         *rem = *n % div;
 487         *n /= div;
 488 }
 489
 490 #elif defined(i386)
 491
 492 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
 493 {
 494         u_int32_t low, high;
 495         low = *n & 0xffffffff;
 496         high = *n >> 32;
 497         if (high) {
 498                 u_int32_t high1 = high % div;
 499                 high /= div;
 500                 asm("divl %2":"=a" (low), "=d" (*rem):"rm" (div), "a" (low), "d" (high1));
 501                 *n = (u_int64_t)high << 32 | low;
 502         } else {
 503                 *n = low / div;
 504                 *rem = low % div;
 505         }
 506 }
 507 #else
 508
 509 static inline void divl(u_int32_t high, u_int32_t low,
 510                         u_int32_t div,
 511                         u_int32_t *q, u_int32_t *r)
 512 {
 513         u_int64_t n = (u_int64_t)high << 32 | low;
 514         u_int64_t d = (u_int64_t)div << 31;
 515         u_int32_t q1 = 0;
 516         int c = 32;
 517         while (n > 0xffffffffU) {
 518                 q1 <<= 1;
 519                 if (n >= d) {
 520                         n -= d;
 521                         q1 |= 1;
 522                 }
 523                 d >>= 1;
 524                 c--;
 525         }
 526         q1 <<= c;
 527         if (n) {
 528                 low = n;
 529                 *q = q1 | (low / div);
 530                 *r = low % div;
 531         } else {
 532                 *r = 0;
 533                 *q = q1;
 534         }
 535         return;
 536 }
 537
 538 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
 539 {
 540         u_int32_t low, high;
 541         low = *n & 0xffffffff;
 542         high = *n >> 32;
 543         if (high) {
 544                 u_int32_t high1 = high % div;
 545                 u_int32_t low1 = low;
 546                 high /= div;
 547                 divl(high1, low1, div, &low, rem);
 548                 *n = (u_int64_t)high << 32 | low;
 549         } else {
 550                 *n = low / div;
 551                 *rem = low % div;
 552         }
 553 }
 554 #endif
 555
 556 /*
 557  *  PCM library
 558  */
 559
 560 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
 561 {
 562         return substream->group != &substream->self_group;
 563 }
 564
 565 static inline void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
 566 {
 567         read_lock(&snd_pcm_link_rwlock);
 568         spin_lock(&substream->self_group.lock);
 569 }
 570
 571 static inline void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
 572 {
 573         spin_unlock(&substream->self_group.lock);
 574         read_unlock(&snd_pcm_link_rwlock);
 575 }
 576
 577 static inline void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
 578 {
 579         read_lock_irq(&snd_pcm_link_rwlock);
 580         spin_lock(&substream->self_group.lock);
 581 }
 582
 583 static inline void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
 584 {
 585         spin_unlock(&substream->self_group.lock);
 586         read_unlock_irq(&snd_pcm_link_rwlock);
 587 }
 588
 589 #define snd_pcm_stream_lock_irqsave(substream, flags) \
 590 do { \
 591         read_lock_irqsave(&snd_pcm_link_rwlock, (flags)); \
 592         spin_lock(&substream->self_group.lock); \
 593 } while (0)
 594
 595 #define snd_pcm_stream_unlock_irqrestore(substream, flags) \
 596 do { \
 597         spin_unlock(&substream->self_group.lock); \
 598         read_unlock_irqrestore(&snd_pcm_link_rwlock, (flags)); \
 599 } while (0)
 600
 601 #define snd_pcm_group_for_each_entry(s, substream) \
 602         list_for_each_entry(s, &substream->group->substreams, link_list)
 603
 604 static inline int snd_pcm_running(struct snd_pcm_substream *substream)
 605 {
 606         return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 607                 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
 608                  substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
 609 }
 610
 611 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
 612 {
 613         return size * 8 / runtime->sample_bits;
 614 }
 615
 616 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
 617 {
 618         return size * 8 / runtime->frame_bits;
 619 }
 620
 621 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
 622 {
 623         return size * runtime->sample_bits / 8;
 624 }
 625
 626 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
 627 {
 628         return size * runtime->frame_bits / 8;
 629 }
 630
 631 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
 632 {
 633         return bytes % runtime->byte_align == 0;
 634 }
 635
 636 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
 637 {
 638         struct snd_pcm_runtime *runtime = substream->runtime;
 639         return frames_to_bytes(runtime, runtime->buffer_size);
 640 }
 641
 642 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
 643 {
 644         struct snd_pcm_runtime *runtime = substream->runtime;
 645         return frames_to_bytes(runtime, runtime->period_size);
 646 }
 647
 648 /*
 649  *  result is: 0 ... (boundary - 1)
 650  */
 651 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
 652 {
 653         snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
 654         if (avail < 0)
 655                 avail += runtime->boundary;
 656         else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
 657                 avail -= runtime->boundary;
 658         return avail;
 659 }
 660
 661 /*
 662  *  result is: 0 ... (boundary - 1)
 663  */
 664 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
 665 {
 666         snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
 667         if (avail < 0)
 668                 avail += runtime->boundary;
 669         return avail;
 670 }
 671
 672 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
 673 {
 674         return runtime->buffer_size - snd_pcm_playback_avail(runtime);
 675 }
 676
 677 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
 678 {
 679         return runtime->buffer_size - snd_pcm_capture_avail(runtime);
 680 }
 681
 682 /**
 683  * snd_pcm_playback_ready - check whether the playback buffer is available
 684  * @substream: the pcm substream instance
 685  *
 686  * Checks whether enough free space is available on the playback buffer.
 687  *
 688  * Returns non-zero if available, or zero if not.
 689  */
 690 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
 691 {
 692         struct snd_pcm_runtime *runtime = substream->runtime;
 693         return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
 694 }
 695
 696 /**
 697  * snd_pcm_capture_ready - check whether the capture buffer is available
 698  * @substream: the pcm substream instance
 699  *
 700  * Checks whether enough capture data is available on the capture buffer.
 701  *
 702  * Returns non-zero if available, or zero if not.
 703  */
 704 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
 705 {
 706         struct snd_pcm_runtime *runtime = substream->runtime;
 707         return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
 708 }
 709
 710 /**
 711  * snd_pcm_playback_data - check whether any data exists on the playback buffer
 712  * @substream: the pcm substream instance
 713  *
 714  * Checks whether any data exists on the playback buffer. If stop_threshold
 715  * is bigger or equal to boundary, then this function returns always non-zero.
 716  *
 717  * Returns non-zero if exists, or zero if not.
 718  */
 719 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
 720 {
 721         struct snd_pcm_runtime *runtime = substream->runtime;
 722
 723         if (runtime->stop_threshold >= runtime->boundary)
 724                 return 1;
 725         return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
 726 }
 727
 728 /**
 729  * snd_pcm_playback_empty - check whether the playback buffer is empty
 730  * @substream: the pcm substream instance
 731  *
 732  * Checks whether the playback buffer is empty.
 733  *
 734  * Returns non-zero if empty, or zero if not.
 735  */
 736 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
 737 {
 738         struct snd_pcm_runtime *runtime = substream->runtime;
 739         return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
 740 }
 741
 742 /**
 743  * snd_pcm_capture_empty - check whether the capture buffer is empty
 744  * @substream: the pcm substream instance
 745  *
 746  * Checks whether the capture buffer is empty.
 747  *
 748  * Returns non-zero if empty, or zero if not.
 749  */
 750 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
 751 {
 752         struct snd_pcm_runtime *runtime = substream->runtime;
 753         return snd_pcm_capture_avail(runtime) == 0;
 754 }
 755
 756 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream,
 757                                         struct snd_pcm_substream *master)
 758 {
 759         substream->runtime->trigger_master = master;
 760 }
 761
 762 static inline int hw_is_mask(int var)
 763 {
 764         return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
 765                 var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
 766 }
 767
 768 static inline int hw_is_interval(int var)
 769 {
 770         return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
 771                 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
 772 }
 773
 774 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
 775                                      snd_pcm_hw_param_t var)
 776 {
 777         return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 778 }
 779
 780 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
 781                                              snd_pcm_hw_param_t var)
 782 {
 783         return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 784 }
 785
 786 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
 787                                              snd_pcm_hw_param_t var)
 788 {
 789         return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 790 }
 791
 792 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
 793                                                      snd_pcm_hw_param_t var)
 794 {
 795         return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 796 }
 797
 798 #define params_access(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_ACCESS))
 799 #define params_format(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_FORMAT))
 800 #define params_subformat(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_SUBFORMAT))
 801 #define params_channels(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_CHANNELS)->min
 802 #define params_rate(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_RATE)->min
 803 #define params_period_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min
 804 #define params_period_bytes(p) ((params_period_size(p)*snd_pcm_format_physical_width(params_format(p))*params_channels(p))/8)
 805 #define params_periods(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIODS)->min
 806 #define params_buffer_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min
 807 #define params_buffer_bytes(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min
 808
 809
 810 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
 811 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
 812 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
 813 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
 814                           unsigned int k, struct snd_interval *c);
 815 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
 816                           const struct snd_interval *b, struct snd_interval *c);
 817 int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask);
 818 int snd_interval_ratnum(struct snd_interval *i,
 819                         unsigned int rats_count, struct snd_ratnum *rats,
 820                         unsigned int *nump, unsigned int *denp);
 821
 822 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
 823 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
 824 int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
 825
 826 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
 827
 828 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream);
 829 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream);
 830
 831 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 832                                u_int32_t mask);
 833 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 834                                  u_int64_t mask);
 835 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 836                                  unsigned int min, unsigned int max);
 837 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
 838 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
 839                                unsigned int cond,
 840                                snd_pcm_hw_param_t var,
 841                                struct snd_pcm_hw_constraint_list *l);
 842 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
 843                                   unsigned int cond,
 844                                   snd_pcm_hw_param_t var,
 845                                   struct snd_pcm_hw_constraint_ratnums *r);
 846 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
 847                                   unsigned int cond,
 848                                   snd_pcm_hw_param_t var,
 849                                   struct snd_pcm_hw_constraint_ratdens *r);
 850 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
 851                                  unsigned int cond,
 852                                  unsigned int width,
 853                                  unsigned int msbits);
 854 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
 855                                unsigned int cond,
 856                                snd_pcm_hw_param_t var,
 857                                unsigned long step);
 858 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
 859                                unsigned int cond,
 860                                snd_pcm_hw_param_t var);
 861 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
 862                         unsigned int cond,
 863                         int var,
 864                         snd_pcm_hw_rule_func_t func, void *private,
 865                         int dep, ...);
 866
 867 int snd_pcm_format_signed(snd_pcm_format_t format);
 868 int snd_pcm_format_unsigned(snd_pcm_format_t format);
 869 int snd_pcm_format_linear(snd_pcm_format_t format);
 870 int snd_pcm_format_little_endian(snd_pcm_format_t format);
 871 int snd_pcm_format_big_endian(snd_pcm_format_t format);
 872 #if 0 /* just for DocBook */
 873 /**
 874  * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
 875  * @format: the format to check
 876  *
 877  * Returns 1 if the given PCM format is CPU-endian, 0 if
 878  * opposite, or a negative error code if endian not specified.
 879  */
 880 int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
 881 #endif /* DocBook */
 882 #ifdef SNDRV_LITTLE_ENDIAN
 883 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
 884 #else
 885 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
 886 #endif
 887 int snd_pcm_format_width(snd_pcm_format_t format);                      /* in bits */
 888 int snd_pcm_format_physical_width(snd_pcm_format_t format);             /* in bits */
 889 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
 890 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
 891 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
 892 snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsignd, int big_endian);
 893
 894 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction, struct snd_pcm_ops *ops);
 895 void snd_pcm_set_sync(struct snd_pcm_substream *substream);
 896 int snd_pcm_lib_interleave_len(struct snd_pcm_substream *substream);
 897 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
 898                       unsigned int cmd, void *arg);
 899 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream);
 900 int snd_pcm_playback_xrun_check(struct snd_pcm_substream *substream);
 901 int snd_pcm_capture_xrun_check(struct snd_pcm_substream *substream);
 902 int snd_pcm_playback_xrun_asap(struct snd_pcm_substream *substream);
 903 int snd_pcm_capture_xrun_asap(struct snd_pcm_substream *substream);
 904 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr);
 905 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
 906 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream,
 907                                     const void __user *buf,
 908                                     snd_pcm_uframes_t frames);
 909 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream,
 910                                    void __user *buf, snd_pcm_uframes_t frames);
 911 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
 912                                      void __user **bufs, snd_pcm_uframes_t frames);
 913 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
 914                                     void __user **bufs, snd_pcm_uframes_t frames);
 915
 916 extern const struct snd_pcm_hw_constraint_list snd_pcm_known_rates;
 917
 918 int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime);
 919 unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate);
 920
 921 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
 922                                               struct snd_dma_buffer *bufp)
 923 {
 924         struct snd_pcm_runtime *runtime = substream->runtime;
 925         if (bufp) {
 926                 runtime->dma_buffer_p = bufp;
 927                 runtime->dma_area = bufp->area;
 928                 runtime->dma_addr = bufp->addr;
 929                 runtime->dma_bytes = bufp->bytes;
 930         } else {
 931                 runtime->dma_buffer_p = NULL;
 932                 runtime->dma_area = NULL;
 933                 runtime->dma_addr = 0;
 934                 runtime->dma_bytes = 0;
 935         }
 936 }
 937
 938 /*
 939  *  Timer interface
 940  */
 941
 942 void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream);
 943 void snd_pcm_timer_init(struct snd_pcm_substream *substream);
 944 void snd_pcm_timer_done(struct snd_pcm_substream *substream);
 945
 946 static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime,
 947                                    struct timespec *tv)
 948 {
 949         if (runtime->tstamp_type == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
 950                 do_posix_clock_monotonic_gettime(tv);
 951         else
 952                 getnstimeofday(tv);
 953 }
 954
 955 /*
 956  *  Memory
 957  */
 958
 959 int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
 960 int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
 961 int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
 962                                   int type, struct device *data,
 963                                   size_t size, size_t max);
 964 int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
 965                                           int type, void *data,
 966                                           size_t size, size_t max);
 967 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
 968 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
 969
 970 #define snd_pcm_substream_sgbuf(substream) ((substream)->runtime->dma_buffer_p->private_data)
 971 #define snd_pcm_sgbuf_pages(size) snd_sgbuf_aligned_pages(size)
 972 #define snd_pcm_sgbuf_get_addr(sgbuf,ofs) snd_sgbuf_get_addr(sgbuf,ofs)
 973 struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream, unsigned long offset);
 974
 975 /* handle mmap counter - PCM mmap callback should handle this counter properly */
 976 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
 977 {
 978         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
 979         atomic_inc(&substream->mmap_count);
 980 }
 981
 982 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
 983 {
 984         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
 985         atomic_dec(&substream->mmap_count);
 986 }
 987
 988 /* mmap for io-memory area */
 989 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
 990 #define SNDRV_PCM_INFO_MMAP_IOMEM       SNDRV_PCM_INFO_MMAP
 991 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
 992 #else
 993 #define SNDRV_PCM_INFO_MMAP_IOMEM       0
 994 #define snd_pcm_lib_mmap_iomem  NULL
 995 #endif
 996
 997 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
 998 {
 999         *max = dma < 4 ? 64 * 1024 : 128 * 1024;
1000 }
1001
1002 /*
1003  *  Misc
1004  */
1005
1006 #define SNDRV_PCM_DEFAULT_CON_SPDIF     (IEC958_AES0_CON_EMPHASIS_NONE|\
1007                                          (IEC958_AES1_CON_ORIGINAL<<8)|\
1008                                          (IEC958_AES1_CON_PCM_CODER<<8)|\
1009                                          (IEC958_AES3_CON_FS_48000<<24))
1010
1011 #endif /* __SOUND_PCM_H */