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