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         int no_compat_mmap;
 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 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         unsigned 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 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 429         struct snd_pcm_oss oss;
 430 #endif
 431 };
 432
 433 struct snd_pcm_notify {
 434         int (*n_register) (struct snd_pcm * pcm);
 435         int (*n_disconnect) (struct snd_pcm * pcm);
 436         int (*n_unregister) (struct snd_pcm * pcm);
 437         struct list_head list;
 438 };
 439
 440 /*
 441  *  Registering
 442  */
 443
 444 extern struct file_operations snd_pcm_f_ops[2];
 445
 446 int snd_pcm_new(struct snd_card *card, char *id, int device,
 447                 int playback_count, int capture_count,
 448                 struct snd_pcm **rpcm);
 449 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
 450
 451 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
 452
 453 /*
 454  *  Native I/O
 455  */
 456
 457 extern rwlock_t snd_pcm_link_rwlock;
 458
 459 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
 460 int snd_pcm_info_user(struct snd_pcm_substream *substream,
 461                       struct snd_pcm_info __user *info);
 462 int snd_pcm_status(struct snd_pcm_substream *substream,
 463                    struct snd_pcm_status *status);
 464 int snd_pcm_start(struct snd_pcm_substream *substream);
 465 int snd_pcm_stop(struct snd_pcm_substream *substream, int status);
 466 int snd_pcm_drain_done(struct snd_pcm_substream *substream);
 467 #ifdef CONFIG_PM
 468 int snd_pcm_suspend(struct snd_pcm_substream *substream);
 469 int snd_pcm_suspend_all(struct snd_pcm *pcm);
 470 #endif
 471 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
 472 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
 473                            struct snd_pcm_substream **rsubstream);
 474 void snd_pcm_release_substream(struct snd_pcm_substream *substream);
 475 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
 476                              struct snd_pcm_substream **rsubstream);
 477 void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
 478 void snd_pcm_vma_notify_data(void *client, void *data);
 479 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
 480
 481 #if BITS_PER_LONG >= 64
 482
 483 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
 484 {
 485         *rem = *n % div;
 486         *n /= div;
 487 }
 488
 489 #elif defined(i386)
 490
 491 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
 492 {
 493         u_int32_t low, high;
 494         low = *n & 0xffffffff;
 495         high = *n >> 32;
 496         if (high) {
 497                 u_int32_t high1 = high % div;
 498                 high /= div;
 499                 asm("divl %2":"=a" (low), "=d" (*rem):"rm" (div), "a" (low), "d" (high1));
 500                 *n = (u_int64_t)high << 32 | low;
 501         } else {
 502                 *n = low / div;
 503                 *rem = low % div;
 504         }
 505 }
 506 #else
 507
 508 static inline void divl(u_int32_t high, u_int32_t low,
 509                         u_int32_t div,
 510                         u_int32_t *q, u_int32_t *r)
 511 {
 512         u_int64_t n = (u_int64_t)high << 32 | low;
 513         u_int64_t d = (u_int64_t)div << 31;
 514         u_int32_t q1 = 0;
 515         int c = 32;
 516         while (n > 0xffffffffU) {
 517                 q1 <<= 1;
 518                 if (n >= d) {
 519                         n -= d;
 520                         q1 |= 1;
 521                 }
 522                 d >>= 1;
 523                 c--;
 524         }
 525         q1 <<= c;
 526         if (n) {
 527                 low = n;
 528                 *q = q1 | (low / div);
 529                 *r = low % div;
 530         } else {
 531                 *r = 0;
 532                 *q = q1;
 533         }
 534         return;
 535 }
 536
 537 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
 538 {
 539         u_int32_t low, high;
 540         low = *n & 0xffffffff;
 541         high = *n >> 32;
 542         if (high) {
 543                 u_int32_t high1 = high % div;
 544                 u_int32_t low1 = low;
 545                 high /= div;
 546                 divl(high1, low1, div, &low, rem);
 547                 *n = (u_int64_t)high << 32 | low;
 548         } else {
 549                 *n = low / div;
 550                 *rem = low % div;
 551         }
 552 }
 553 #endif
 554
 555 /*
 556  *  PCM library
 557  */
 558
 559 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
 560 {
 561         return substream->group != &substream->self_group;
 562 }
 563
 564 static inline void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
 565 {
 566         read_lock(&snd_pcm_link_rwlock);
 567         spin_lock(&substream->self_group.lock);
 568 }
 569
 570 static inline void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
 571 {
 572         spin_unlock(&substream->self_group.lock);
 573         read_unlock(&snd_pcm_link_rwlock);
 574 }
 575
 576 static inline void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
 577 {
 578         read_lock_irq(&snd_pcm_link_rwlock);
 579         spin_lock(&substream->self_group.lock);
 580 }
 581
 582 static inline void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
 583 {
 584         spin_unlock(&substream->self_group.lock);
 585         read_unlock_irq(&snd_pcm_link_rwlock);
 586 }
 587
 588 #define snd_pcm_stream_lock_irqsave(substream, flags) \
 589 do { \
 590         read_lock_irqsave(&snd_pcm_link_rwlock, (flags)); \
 591         spin_lock(&substream->self_group.lock); \
 592 } while (0)
 593
 594 #define snd_pcm_stream_unlock_irqrestore(substream, flags) \
 595 do { \
 596         spin_unlock(&substream->self_group.lock); \
 597         read_unlock_irqrestore(&snd_pcm_link_rwlock, (flags)); \
 598 } while (0)
 599
 600 #define snd_pcm_group_for_each(pos, substream) \
 601         list_for_each(pos, &substream->group->substreams)
 602
 603 #define snd_pcm_group_substream_entry(pos) \
 604         list_entry(pos, struct snd_pcm_substream, link_list)
 605
 606 static inline int snd_pcm_running(struct snd_pcm_substream *substream)
 607 {
 608         return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 609                 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
 610                  substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
 611 }
 612
 613 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
 614 {
 615         return size * 8 / runtime->sample_bits;
 616 }
 617
 618 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
 619 {
 620         return size * 8 / runtime->frame_bits;
 621 }
 622
 623 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
 624 {
 625         return size * runtime->sample_bits / 8;
 626 }
 627
 628 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
 629 {
 630         return size * runtime->frame_bits / 8;
 631 }
 632
 633 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
 634 {
 635         return bytes % runtime->byte_align == 0;
 636 }
 637
 638 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
 639 {
 640         struct snd_pcm_runtime *runtime = substream->runtime;
 641         return frames_to_bytes(runtime, runtime->buffer_size);
 642 }
 643
 644 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
 645 {
 646         struct snd_pcm_runtime *runtime = substream->runtime;
 647         return frames_to_bytes(runtime, runtime->period_size);
 648 }
 649
 650 /*
 651  *  result is: 0 ... (boundary - 1)
 652  */
 653 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
 654 {
 655         snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
 656         if (avail < 0)
 657                 avail += runtime->boundary;
 658         else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
 659                 avail -= runtime->boundary;
 660         return avail;
 661 }
 662
 663 /*
 664  *  result is: 0 ... (boundary - 1)
 665  */
 666 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
 667 {
 668         snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
 669         if (avail < 0)
 670                 avail += runtime->boundary;
 671         return avail;
 672 }
 673
 674 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
 675 {
 676         return runtime->buffer_size - snd_pcm_playback_avail(runtime);
 677 }
 678
 679 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
 680 {
 681         return runtime->buffer_size - snd_pcm_capture_avail(runtime);
 682 }
 683
 684 /**
 685  * snd_pcm_playback_ready - check whether the playback buffer is available
 686  * @substream: the pcm substream instance
 687  *
 688  * Checks whether enough free space is available on the playback buffer.
 689  *
 690  * Returns non-zero if available, or zero if not.
 691  */
 692 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
 693 {
 694         struct snd_pcm_runtime *runtime = substream->runtime;
 695         return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
 696 }
 697
 698 /**
 699  * snd_pcm_capture_ready - check whether the capture buffer is available
 700  * @substream: the pcm substream instance
 701  *
 702  * Checks whether enough capture data is available on the capture buffer.
 703  *
 704  * Returns non-zero if available, or zero if not.
 705  */
 706 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
 707 {
 708         struct snd_pcm_runtime *runtime = substream->runtime;
 709         return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
 710 }
 711
 712 /**
 713  * snd_pcm_playback_data - check whether any data exists on the playback buffer
 714  * @substream: the pcm substream instance
 715  *
 716  * Checks whether any data exists on the playback buffer. If stop_threshold
 717  * is bigger or equal to boundary, then this function returns always non-zero.
 718  *
 719  * Returns non-zero if exists, or zero if not.
 720  */
 721 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
 722 {
 723         struct snd_pcm_runtime *runtime = substream->runtime;
 724
 725         if (runtime->stop_threshold >= runtime->boundary)
 726                 return 1;
 727         return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
 728 }
 729
 730 /**
 731  * snd_pcm_playback_empty - check whether the playback buffer is empty
 732  * @substream: the pcm substream instance
 733  *
 734  * Checks whether the playback buffer is empty.
 735  *
 736  * Returns non-zero if empty, or zero if not.
 737  */
 738 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
 739 {
 740         struct snd_pcm_runtime *runtime = substream->runtime;
 741         return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
 742 }
 743
 744 /**
 745  * snd_pcm_capture_empty - check whether the capture buffer is empty
 746  * @substream: the pcm substream instance
 747  *
 748  * Checks whether the capture buffer is empty.
 749  *
 750  * Returns non-zero if empty, or zero if not.
 751  */
 752 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
 753 {
 754         struct snd_pcm_runtime *runtime = substream->runtime;
 755         return snd_pcm_capture_avail(runtime) == 0;
 756 }
 757
 758 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream,
 759                                         struct snd_pcm_substream *master)
 760 {
 761         substream->runtime->trigger_master = master;
 762 }
 763
 764 static inline int hw_is_mask(int var)
 765 {
 766         return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
 767                 var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
 768 }
 769
 770 static inline int hw_is_interval(int var)
 771 {
 772         return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
 773                 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
 774 }
 775
 776 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
 777                                      snd_pcm_hw_param_t var)
 778 {
 779         return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 780 }
 781
 782 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
 783                                              snd_pcm_hw_param_t var)
 784 {
 785         return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 786 }
 787
 788 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
 789                                              snd_pcm_hw_param_t var)
 790 {
 791         return (const struct snd_mask *)hw_param_mask((struct snd_pcm_hw_params*) params, var);
 792 }
 793
 794 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
 795                                                      snd_pcm_hw_param_t var)
 796 {
 797         return (const struct snd_interval *)hw_param_interval((struct snd_pcm_hw_params*) params, var);
 798 }
 799
 800 #define params_access(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_ACCESS))
 801 #define params_format(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_FORMAT))
 802 #define params_subformat(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_SUBFORMAT))
 803 #define params_channels(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_CHANNELS)->min
 804 #define params_rate(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_RATE)->min
 805 #define params_period_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min
 806 #define params_period_bytes(p) ((params_period_size(p)*snd_pcm_format_physical_width(params_format(p))*params_channels(p))/8)
 807 #define params_periods(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIODS)->min
 808 #define params_buffer_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min
 809 #define params_buffer_bytes(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min
 810 #define params_tick_time(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_TICK_TIME)->min
 811
 812
 813 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
 814 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
 815 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
 816 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
 817                           unsigned int k, struct snd_interval *c);
 818 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
 819                           const struct snd_interval *b, struct snd_interval *c);
 820 int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask);
 821 int snd_interval_ratnum(struct snd_interval *i,
 822                         unsigned int rats_count, struct snd_ratnum *rats,
 823                         unsigned int *nump, unsigned int *denp);
 824
 825 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
 826 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
 827 int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
 828
 829 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
 830
 831 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream);
 832 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream);
 833
 834 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 835                                u_int32_t mask);
 836 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 837                                  u_int64_t mask);
 838 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 839                                  unsigned int min, unsigned int max);
 840 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
 841 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
 842                                unsigned int cond,
 843                                snd_pcm_hw_param_t var,
 844                                struct snd_pcm_hw_constraint_list *l);
 845 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
 846                                   unsigned int cond,
 847                                   snd_pcm_hw_param_t var,
 848                                   struct snd_pcm_hw_constraint_ratnums *r);
 849 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
 850                                   unsigned int cond,
 851                                   snd_pcm_hw_param_t var,
 852                                   struct snd_pcm_hw_constraint_ratdens *r);
 853 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
 854                                  unsigned int cond,
 855                                  unsigned int width,
 856                                  unsigned int msbits);
 857 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
 858                                unsigned int cond,
 859                                snd_pcm_hw_param_t var,
 860                                unsigned long step);
 861 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
 862                                unsigned int cond,
 863                                snd_pcm_hw_param_t var);
 864 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
 865                         unsigned int cond,
 866                         int var,
 867                         snd_pcm_hw_rule_func_t func, void *private,
 868                         int dep, ...);
 869
 870 int snd_pcm_format_signed(snd_pcm_format_t format);
 871 int snd_pcm_format_unsigned(snd_pcm_format_t format);
 872 int snd_pcm_format_linear(snd_pcm_format_t format);
 873 int snd_pcm_format_little_endian(snd_pcm_format_t format);
 874 int snd_pcm_format_big_endian(snd_pcm_format_t format);
 875 #if 0 /* just for DocBook */
 876 /**
 877  * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
 878  * @format: the format to check
 879  *
 880  * Returns 1 if the given PCM format is CPU-endian, 0 if
 881  * opposite, or a negative error code if endian not specified.
 882  */
 883 int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
 884 #endif /* DocBook */
 885 #ifdef SNDRV_LITTLE_ENDIAN
 886 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
 887 #else
 888 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
 889 #endif
 890 int snd_pcm_format_width(snd_pcm_format_t format);                      /* in bits */
 891 int snd_pcm_format_physical_width(snd_pcm_format_t format);             /* in bits */
 892 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
 893 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
 894 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
 895 snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsignd, int big_endian);
 896
 897 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction, struct snd_pcm_ops *ops);
 898 void snd_pcm_set_sync(struct snd_pcm_substream *substream);
 899 int snd_pcm_lib_interleave_len(struct snd_pcm_substream *substream);
 900 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
 901                       unsigned int cmd, void *arg);
 902 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream);
 903 int snd_pcm_playback_xrun_check(struct snd_pcm_substream *substream);
 904 int snd_pcm_capture_xrun_check(struct snd_pcm_substream *substream);
 905 int snd_pcm_playback_xrun_asap(struct snd_pcm_substream *substream);
 906 int snd_pcm_capture_xrun_asap(struct snd_pcm_substream *substream);
 907 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr);
 908 void snd_pcm_tick_prepare(struct snd_pcm_substream *substream);
 909 void snd_pcm_tick_set(struct snd_pcm_substream *substream, unsigned long ticks);
 910 void snd_pcm_tick_elapsed(struct snd_pcm_substream *substream);
 911 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
 912 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream,
 913                                     const void __user *buf,
 914                                     snd_pcm_uframes_t frames);
 915 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream,
 916                                    void __user *buf, snd_pcm_uframes_t frames);
 917 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
 918                                      void __user **bufs, snd_pcm_uframes_t frames);
 919 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
 920                                     void __user **bufs, snd_pcm_uframes_t frames);
 921
 922 int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime);
 923
 924 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
 925                                               struct snd_dma_buffer *bufp)
 926 {
 927         struct snd_pcm_runtime *runtime = substream->runtime;
 928         if (bufp) {
 929                 runtime->dma_buffer_p = bufp;
 930                 runtime->dma_area = bufp->area;
 931                 runtime->dma_addr = bufp->addr;
 932                 runtime->dma_bytes = bufp->bytes;
 933         } else {
 934                 runtime->dma_buffer_p = NULL;
 935                 runtime->dma_area = NULL;
 936                 runtime->dma_addr = 0;
 937                 runtime->dma_bytes = 0;
 938         }
 939 }
 940
 941 /*
 942  *  Timer interface
 943  */
 944
 945 void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream);
 946 void snd_pcm_timer_init(struct snd_pcm_substream *substream);
 947 void snd_pcm_timer_done(struct snd_pcm_substream *substream);
 948
 949 /*
 950  *  Memory
 951  */
 952
 953 int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
 954 int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
 955 int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
 956                                   int type, struct device *data,
 957                                   size_t size, size_t max);
 958 int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
 959                                           int type, void *data,
 960                                           size_t size, size_t max);
 961 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
 962 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
 963
 964 #define snd_pcm_substream_sgbuf(substream) ((substream)->runtime->dma_buffer_p->private_data)
 965 #define snd_pcm_sgbuf_pages(size) snd_sgbuf_aligned_pages(size)
 966 #define snd_pcm_sgbuf_get_addr(sgbuf,ofs) snd_sgbuf_get_addr(sgbuf,ofs)
 967 struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream, unsigned long offset);
 968
 969 /* handle mmap counter - PCM mmap callback should handle this counter properly */
 970 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
 971 {
 972         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
 973         atomic_inc(&substream->mmap_count);
 974 }
 975
 976 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
 977 {
 978         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
 979         atomic_dec(&substream->mmap_count);
 980 }
 981
 982 /* mmap for io-memory area */
 983 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
 984 #define SNDRV_PCM_INFO_MMAP_IOMEM       SNDRV_PCM_INFO_MMAP
 985 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
 986 #else
 987 #define SNDRV_PCM_INFO_MMAP_IOMEM       0
 988 #define snd_pcm_lib_mmap_iomem  NULL
 989 #endif
 990
 991 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
 992 {
 993         *max = dma < 4 ? 64 * 1024 : 128 * 1024;
 994 }
 995
 996 /*
 997  *  Misc
 998  */
 999
1000 #define SNDRV_PCM_DEFAULT_CON_SPDIF     (IEC958_AES0_CON_EMPHASIS_NONE|\
1001                                          (IEC958_AES1_CON_ORIGINAL<<8)|\
1002                                          (IEC958_AES1_CON_PCM_CODER<<8)|\
1003                                          (IEC958_AES3_CON_FS_48000<<24))
1004
1005 #endif /* __SOUND_PCM_H */