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         atomic_t mmap_count;
 304
 305         /* -- locking / scheduling -- */
 306         wait_queue_head_t sleep;
 307         struct timer_list tick_timer;
 308         struct fasync_struct *fasync;
 309
 310         /* -- private section -- */
 311         void *private_data;
 312         void (*private_free)(struct snd_pcm_runtime *runtime);
 313
 314         /* -- hardware description -- */
 315         struct snd_pcm_hardware hw;
 316         struct snd_pcm_hw_constraints hw_constraints;
 317
 318         /* -- interrupt callbacks -- */
 319         void (*transfer_ack_begin)(struct snd_pcm_substream *substream);
 320         void (*transfer_ack_end)(struct snd_pcm_substream *substream);
 321
 322         /* -- timer -- */
 323         unsigned int timer_resolution;  /* timer resolution */
 324
 325         /* -- DMA -- */
 326         unsigned char *dma_area;        /* DMA area */
 327         dma_addr_t dma_addr;            /* physical bus address (not accessible from main CPU) */
 328         size_t dma_bytes;               /* size of DMA area */
 329
 330         struct snd_dma_buffer *dma_buffer_p;    /* allocated buffer */
 331
 332 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 333         /* -- OSS things -- */
 334         struct snd_pcm_oss_runtime oss;
 335 #endif
 336 };
 337
 338 struct snd_pcm_group {          /* keep linked substreams */
 339         spinlock_t lock;
 340         struct list_head substreams;
 341         int count;
 342 };
 343
 344 struct snd_pcm_substream {
 345         struct snd_pcm *pcm;
 346         struct snd_pcm_str *pstr;
 347         void *private_data;             /* copied from pcm->private_data */
 348         int number;
 349         char name[32];                  /* substream name */
 350         int stream;                     /* stream (direction) */
 351         size_t buffer_bytes_max;        /* limit ring buffer size */
 352         struct snd_dma_buffer dma_buffer;
 353         unsigned int dma_buf_id;
 354         size_t dma_max;
 355         /* -- hardware operations -- */
 356         struct snd_pcm_ops *ops;
 357         /* -- runtime information -- */
 358         struct snd_pcm_runtime *runtime;
 359         /* -- timer section -- */
 360         struct snd_timer *timer;                /* timer */
 361         unsigned timer_running: 1;      /* time is running */
 362         spinlock_t timer_lock;
 363         /* -- next substream -- */
 364         struct snd_pcm_substream *next;
 365         /* -- linked substreams -- */
 366         struct list_head link_list;     /* linked list member */
 367         struct snd_pcm_group self_group;        /* fake group for non linked substream (with substream lock inside) */
 368         struct snd_pcm_group *group;            /* pointer to current group */
 369         /* -- assigned files -- */
 370         void *file;
 371         struct file *ffile;
 372         void (*pcm_release)(struct snd_pcm_substream *);
 373 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 374         /* -- OSS things -- */
 375         struct snd_pcm_oss_substream oss;
 376 #endif
 377         struct snd_info_entry *proc_root;
 378         struct snd_info_entry *proc_info_entry;
 379         struct snd_info_entry *proc_hw_params_entry;
 380         struct snd_info_entry *proc_sw_params_entry;
 381         struct snd_info_entry *proc_status_entry;
 382         struct snd_info_entry *proc_prealloc_entry;
 383         /* misc flags */
 384         unsigned int no_mmap_ctrl: 1;
 385         unsigned int hw_opened: 1;
 386 };
 387
 388 #define SUBSTREAM_BUSY(substream) ((substream)->file != NULL)
 389
 390
 391 struct snd_pcm_str {
 392         int stream;                             /* stream (direction) */
 393         struct snd_pcm *pcm;
 394         /* -- substreams -- */
 395         unsigned int substream_count;
 396         unsigned int substream_opened;
 397         struct snd_pcm_substream *substream;
 398 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 399         /* -- OSS things -- */
 400         struct snd_pcm_oss_stream oss;
 401 #endif
 402         struct snd_pcm_file *files;
 403         struct snd_info_entry *proc_root;
 404         struct snd_info_entry *proc_info_entry;
 405 #ifdef CONFIG_SND_DEBUG
 406         unsigned int xrun_debug;        /* 0 = disabled, 1 = verbose, 2 = stacktrace */
 407         struct snd_info_entry *proc_xrun_debug_entry;
 408 #endif
 409 };
 410
 411 struct snd_pcm {
 412         struct snd_card *card;
 413         struct list_head list;
 414         unsigned int device;    /* device number */
 415         unsigned int info_flags;
 416         unsigned short dev_class;
 417         unsigned short dev_subclass;
 418         char id[64];
 419         char name[80];
 420         struct snd_pcm_str streams[2];
 421         struct mutex open_mutex;
 422         wait_queue_head_t open_wait;
 423         void *private_data;
 424         void (*private_free) (struct snd_pcm *pcm);
 425 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 426         struct snd_pcm_oss oss;
 427 #endif
 428 };
 429
 430 struct snd_pcm_notify {
 431         int (*n_register) (struct snd_pcm * pcm);
 432         int (*n_disconnect) (struct snd_pcm * pcm);
 433         int (*n_unregister) (struct snd_pcm * pcm);
 434         struct list_head list;
 435 };
 436
 437 /*
 438  *  Registering
 439  */
 440
 441 extern struct file_operations snd_pcm_f_ops[2];
 442
 443 int snd_pcm_new(struct snd_card *card, char *id, int device,
 444                 int playback_count, int capture_count,
 445                 struct snd_pcm **rpcm);
 446 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
 447
 448 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
 449
 450 /*
 451  *  Native I/O
 452  */
 453
 454 extern rwlock_t snd_pcm_link_rwlock;
 455
 456 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
 457 int snd_pcm_info_user(struct snd_pcm_substream *substream,
 458                       struct snd_pcm_info __user *info);
 459 int snd_pcm_status(struct snd_pcm_substream *substream,
 460                    struct snd_pcm_status *status);
 461 int snd_pcm_start(struct snd_pcm_substream *substream);
 462 int snd_pcm_stop(struct snd_pcm_substream *substream, int status);
 463 int snd_pcm_drain_done(struct snd_pcm_substream *substream);
 464 #ifdef CONFIG_PM
 465 int snd_pcm_suspend(struct snd_pcm_substream *substream);
 466 int snd_pcm_suspend_all(struct snd_pcm *pcm);
 467 #endif
 468 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
 469 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
 470                            struct snd_pcm_substream **rsubstream);
 471 void snd_pcm_release_substream(struct snd_pcm_substream *substream);
 472 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
 473                              struct snd_pcm_substream **rsubstream);
 474 void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
 475 void snd_pcm_vma_notify_data(void *client, void *data);
 476 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
 477
 478 #if BITS_PER_LONG >= 64
 479
 480 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
 481 {
 482         *rem = *n % div;
 483         *n /= div;
 484 }
 485
 486 #elif defined(i386)
 487
 488 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
 489 {
 490         u_int32_t low, high;
 491         low = *n & 0xffffffff;
 492         high = *n >> 32;
 493         if (high) {
 494                 u_int32_t high1 = high % div;
 495                 high /= div;
 496                 asm("divl %2":"=a" (low), "=d" (*rem):"rm" (div), "a" (low), "d" (high1));
 497                 *n = (u_int64_t)high << 32 | low;
 498         } else {
 499                 *n = low / div;
 500                 *rem = low % div;
 501         }
 502 }
 503 #else
 504
 505 static inline void divl(u_int32_t high, u_int32_t low,
 506                         u_int32_t div,
 507                         u_int32_t *q, u_int32_t *r)
 508 {
 509         u_int64_t n = (u_int64_t)high << 32 | low;
 510         u_int64_t d = (u_int64_t)div << 31;
 511         u_int32_t q1 = 0;
 512         int c = 32;
 513         while (n > 0xffffffffU) {
 514                 q1 <<= 1;
 515                 if (n >= d) {
 516                         n -= d;
 517                         q1 |= 1;
 518                 }
 519                 d >>= 1;
 520                 c--;
 521         }
 522         q1 <<= c;
 523         if (n) {
 524                 low = n;
 525                 *q = q1 | (low / div);
 526                 *r = low % div;
 527         } else {
 528                 *r = 0;
 529                 *q = q1;
 530         }
 531         return;
 532 }
 533
 534 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
 535 {
 536         u_int32_t low, high;
 537         low = *n & 0xffffffff;
 538         high = *n >> 32;
 539         if (high) {
 540                 u_int32_t high1 = high % div;
 541                 u_int32_t low1 = low;
 542                 high /= div;
 543                 divl(high1, low1, div, &low, rem);
 544                 *n = (u_int64_t)high << 32 | low;
 545         } else {
 546                 *n = low / div;
 547                 *rem = low % div;
 548         }
 549 }
 550 #endif
 551
 552 /*
 553  *  PCM library
 554  */
 555
 556 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
 557 {
 558         return substream->group != &substream->self_group;
 559 }
 560
 561 static inline void snd_pcm_stream_lock(struct snd_pcm_substream *substream)
 562 {
 563         read_lock(&snd_pcm_link_rwlock);
 564         spin_lock(&substream->self_group.lock);
 565 }
 566
 567 static inline void snd_pcm_stream_unlock(struct snd_pcm_substream *substream)
 568 {
 569         spin_unlock(&substream->self_group.lock);
 570         read_unlock(&snd_pcm_link_rwlock);
 571 }
 572
 573 static inline void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream)
 574 {
 575         read_lock_irq(&snd_pcm_link_rwlock);
 576         spin_lock(&substream->self_group.lock);
 577 }
 578
 579 static inline void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream)
 580 {
 581         spin_unlock(&substream->self_group.lock);
 582         read_unlock_irq(&snd_pcm_link_rwlock);
 583 }
 584
 585 #define snd_pcm_stream_lock_irqsave(substream, flags) \
 586 do { \
 587         read_lock_irqsave(&snd_pcm_link_rwlock, (flags)); \
 588         spin_lock(&substream->self_group.lock); \
 589 } while (0)
 590
 591 #define snd_pcm_stream_unlock_irqrestore(substream, flags) \
 592 do { \
 593         spin_unlock(&substream->self_group.lock); \
 594         read_unlock_irqrestore(&snd_pcm_link_rwlock, (flags)); \
 595 } while (0)
 596
 597 #define snd_pcm_group_for_each(pos, substream) \
 598         list_for_each(pos, &substream->group->substreams)
 599
 600 #define snd_pcm_group_substream_entry(pos) \
 601         list_entry(pos, struct snd_pcm_substream, link_list)
 602
 603 static inline int snd_pcm_running(struct snd_pcm_substream *substream)
 604 {
 605         return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 606                 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
 607                  substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
 608 }
 609
 610 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
 611 {
 612         return size * 8 / runtime->sample_bits;
 613 }
 614
 615 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
 616 {
 617         return size * 8 / runtime->frame_bits;
 618 }
 619
 620 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
 621 {
 622         return size * runtime->sample_bits / 8;
 623 }
 624
 625 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
 626 {
 627         return size * runtime->frame_bits / 8;
 628 }
 629
 630 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
 631 {
 632         return bytes % runtime->byte_align == 0;
 633 }
 634
 635 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
 636 {
 637         struct snd_pcm_runtime *runtime = substream->runtime;
 638         return frames_to_bytes(runtime, runtime->buffer_size);
 639 }
 640
 641 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
 642 {
 643         struct snd_pcm_runtime *runtime = substream->runtime;
 644         return frames_to_bytes(runtime, runtime->period_size);
 645 }
 646
 647 /*
 648  *  result is: 0 ... (boundary - 1)
 649  */
 650 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
 651 {
 652         snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
 653         if (avail < 0)
 654                 avail += runtime->boundary;
 655         else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
 656                 avail -= runtime->boundary;
 657         return avail;
 658 }
 659
 660 /*
 661  *  result is: 0 ... (boundary - 1)
 662  */
 663 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
 664 {
 665         snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
 666         if (avail < 0)
 667                 avail += runtime->boundary;
 668         return avail;
 669 }
 670
 671 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
 672 {
 673         return runtime->buffer_size - snd_pcm_playback_avail(runtime);
 674 }
 675
 676 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
 677 {
 678         return runtime->buffer_size - snd_pcm_capture_avail(runtime);
 679 }
 680
 681 /**
 682  * snd_pcm_playback_ready - check whether the playback buffer is available
 683  * @substream: the pcm substream instance
 684  *
 685  * Checks whether enough free space is available on the playback buffer.
 686  *
 687  * Returns non-zero if available, or zero if not.
 688  */
 689 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
 690 {
 691         struct snd_pcm_runtime *runtime = substream->runtime;
 692         return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
 693 }
 694
 695 /**
 696  * snd_pcm_capture_ready - check whether the capture buffer is available
 697  * @substream: the pcm substream instance
 698  *
 699  * Checks whether enough capture data is available on the capture buffer.
 700  *
 701  * Returns non-zero if available, or zero if not.
 702  */
 703 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
 704 {
 705         struct snd_pcm_runtime *runtime = substream->runtime;
 706         return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
 707 }
 708
 709 /**
 710  * snd_pcm_playback_data - check whether any data exists on the playback buffer
 711  * @substream: the pcm substream instance
 712  *
 713  * Checks whether any data exists on the playback buffer. If stop_threshold
 714  * is bigger or equal to boundary, then this function returns always non-zero.
 715  *
 716  * Returns non-zero if exists, or zero if not.
 717  */
 718 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
 719 {
 720         struct snd_pcm_runtime *runtime = substream->runtime;
 721
 722         if (runtime->stop_threshold >= runtime->boundary)
 723                 return 1;
 724         return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
 725 }
 726
 727 /**
 728  * snd_pcm_playback_empty - check whether the playback buffer is empty
 729  * @substream: the pcm substream instance
 730  *
 731  * Checks whether the playback buffer is empty.
 732  *
 733  * Returns non-zero if empty, or zero if not.
 734  */
 735 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
 736 {
 737         struct snd_pcm_runtime *runtime = substream->runtime;
 738         return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
 739 }
 740
 741 /**
 742  * snd_pcm_capture_empty - check whether the capture buffer is empty
 743  * @substream: the pcm substream instance
 744  *
 745  * Checks whether the capture buffer is empty.
 746  *
 747  * Returns non-zero if empty, or zero if not.
 748  */
 749 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
 750 {
 751         struct snd_pcm_runtime *runtime = substream->runtime;
 752         return snd_pcm_capture_avail(runtime) == 0;
 753 }
 754
 755 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream,
 756                                         struct snd_pcm_substream *master)
 757 {
 758         substream->runtime->trigger_master = master;
 759 }
 760
 761 static inline int hw_is_mask(int var)
 762 {
 763         return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
 764                 var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
 765 }
 766
 767 static inline int hw_is_interval(int var)
 768 {
 769         return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
 770                 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
 771 }
 772
 773 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
 774                                      snd_pcm_hw_param_t var)
 775 {
 776         return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 777 }
 778
 779 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
 780                                              snd_pcm_hw_param_t var)
 781 {
 782         return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 783 }
 784
 785 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
 786                                              snd_pcm_hw_param_t var)
 787 {
 788         return (const struct snd_mask *)hw_param_mask((struct snd_pcm_hw_params*) params, var);
 789 }
 790
 791 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
 792                                                      snd_pcm_hw_param_t var)
 793 {
 794         return (const struct snd_interval *)hw_param_interval((struct snd_pcm_hw_params*) params, var);
 795 }
 796
 797 #define params_access(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_ACCESS))
 798 #define params_format(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_FORMAT))
 799 #define params_subformat(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_SUBFORMAT))
 800 #define params_channels(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_CHANNELS)->min
 801 #define params_rate(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_RATE)->min
 802 #define params_period_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min
 803 #define params_period_bytes(p) ((params_period_size(p)*snd_pcm_format_physical_width(params_format(p))*params_channels(p))/8)
 804 #define params_periods(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIODS)->min
 805 #define params_buffer_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min
 806 #define params_buffer_bytes(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min
 807 #define params_tick_time(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_TICK_TIME)->min
 808
 809
 810 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
 811 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
 812 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
 813 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
 814                           unsigned int k, struct snd_interval *c);
 815 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
 816                           const struct snd_interval *b, struct snd_interval *c);
 817 int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask);
 818 int snd_interval_ratnum(struct snd_interval *i,
 819                         unsigned int rats_count, struct snd_ratnum *rats,
 820                         unsigned int *nump, unsigned int *denp);
 821
 822 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
 823 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
 824 int snd_pcm_hw_param_near(struct snd_pcm_substream *substream,
 825                           struct snd_pcm_hw_params *params,
 826                           snd_pcm_hw_param_t var,
 827                           unsigned int val, int *dir);
 828 int snd_pcm_hw_param_set(struct snd_pcm_substream *pcm,
 829                          struct snd_pcm_hw_params *params,
 830                          snd_pcm_hw_param_t var,
 831                          unsigned int val, int dir);
 832 int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
 833
 834 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
 835
 836 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream);
 837 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream);
 838
 839 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 840                                u_int32_t mask);
 841 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 842                                  u_int64_t mask);
 843 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 844                                  unsigned int min, unsigned int max);
 845 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
 846 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
 847                                unsigned int cond,
 848                                snd_pcm_hw_param_t var,
 849                                struct snd_pcm_hw_constraint_list *l);
 850 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
 851                                   unsigned int cond,
 852                                   snd_pcm_hw_param_t var,
 853                                   struct snd_pcm_hw_constraint_ratnums *r);
 854 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
 855                                   unsigned int cond,
 856                                   snd_pcm_hw_param_t var,
 857                                   struct snd_pcm_hw_constraint_ratdens *r);
 858 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
 859                                  unsigned int cond,
 860                                  unsigned int width,
 861                                  unsigned int msbits);
 862 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
 863                                unsigned int cond,
 864                                snd_pcm_hw_param_t var,
 865                                unsigned long step);
 866 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
 867                                unsigned int cond,
 868                                snd_pcm_hw_param_t var);
 869 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
 870                         unsigned int cond,
 871                         int var,
 872                         snd_pcm_hw_rule_func_t func, void *private,
 873                         int dep, ...);
 874
 875 int snd_pcm_format_signed(snd_pcm_format_t format);
 876 int snd_pcm_format_unsigned(snd_pcm_format_t format);
 877 int snd_pcm_format_linear(snd_pcm_format_t format);
 878 int snd_pcm_format_little_endian(snd_pcm_format_t format);
 879 int snd_pcm_format_big_endian(snd_pcm_format_t format);
 880 #if 0 /* just for DocBook */
 881 /**
 882  * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
 883  * @format: the format to check
 884  *
 885  * Returns 1 if the given PCM format is CPU-endian, 0 if
 886  * opposite, or a negative error code if endian not specified.
 887  */
 888 int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
 889 #endif /* DocBook */
 890 #ifdef SNDRV_LITTLE_ENDIAN
 891 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
 892 #else
 893 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
 894 #endif
 895 int snd_pcm_format_width(snd_pcm_format_t format);                      /* in bits */
 896 int snd_pcm_format_physical_width(snd_pcm_format_t format);             /* in bits */
 897 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
 898 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
 899 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
 900 snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsignd, int big_endian);
 901
 902 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction, struct snd_pcm_ops *ops);
 903 void snd_pcm_set_sync(struct snd_pcm_substream *substream);
 904 int snd_pcm_lib_interleave_len(struct snd_pcm_substream *substream);
 905 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
 906                       unsigned int cmd, void *arg);
 907 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream);
 908 int snd_pcm_playback_xrun_check(struct snd_pcm_substream *substream);
 909 int snd_pcm_capture_xrun_check(struct snd_pcm_substream *substream);
 910 int snd_pcm_playback_xrun_asap(struct snd_pcm_substream *substream);
 911 int snd_pcm_capture_xrun_asap(struct snd_pcm_substream *substream);
 912 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr);
 913 void snd_pcm_tick_prepare(struct snd_pcm_substream *substream);
 914 void snd_pcm_tick_set(struct snd_pcm_substream *substream, unsigned long ticks);
 915 void snd_pcm_tick_elapsed(struct snd_pcm_substream *substream);
 916 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
 917 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream,
 918                                     const void __user *buf,
 919                                     snd_pcm_uframes_t frames);
 920 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream,
 921                                    void __user *buf, snd_pcm_uframes_t frames);
 922 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
 923                                      void __user **bufs, snd_pcm_uframes_t frames);
 924 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
 925                                     void __user **bufs, snd_pcm_uframes_t frames);
 926
 927 int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime);
 928
 929 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
 930                                               struct snd_dma_buffer *bufp)
 931 {
 932         struct snd_pcm_runtime *runtime = substream->runtime;
 933         if (bufp) {
 934                 runtime->dma_buffer_p = bufp;
 935                 runtime->dma_area = bufp->area;
 936                 runtime->dma_addr = bufp->addr;
 937                 runtime->dma_bytes = bufp->bytes;
 938         } else {
 939                 runtime->dma_buffer_p = NULL;
 940                 runtime->dma_area = NULL;
 941                 runtime->dma_addr = 0;
 942                 runtime->dma_bytes = 0;
 943         }
 944 }
 945
 946 /*
 947  *  Timer interface
 948  */
 949
 950 void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream);
 951 void snd_pcm_timer_init(struct snd_pcm_substream *substream);
 952 void snd_pcm_timer_done(struct snd_pcm_substream *substream);
 953
 954 /*
 955  *  Memory
 956  */
 957
 958 int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
 959 int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
 960 int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
 961                                   int type, struct device *data,
 962                                   size_t size, size_t max);
 963 int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
 964                                           int type, void *data,
 965                                           size_t size, size_t max);
 966 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
 967 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
 968
 969 #define snd_pcm_substream_sgbuf(substream) ((substream)->runtime->dma_buffer_p->private_data)
 970 #define snd_pcm_sgbuf_pages(size) snd_sgbuf_aligned_pages(size)
 971 #define snd_pcm_sgbuf_get_addr(sgbuf,ofs) snd_sgbuf_get_addr(sgbuf,ofs)
 972 struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream, unsigned long offset);
 973
 974 /* handle mmap counter - PCM mmap callback should handle this counter properly */
 975 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
 976 {
 977         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
 978         atomic_inc(&substream->runtime->mmap_count);
 979 }
 980
 981 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
 982 {
 983         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
 984         atomic_dec(&substream->runtime->mmap_count);
 985 }
 986
 987 /* mmap for io-memory area */
 988 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
 989 #define SNDRV_PCM_INFO_MMAP_IOMEM       SNDRV_PCM_INFO_MMAP
 990 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
 991 #else
 992 #define SNDRV_PCM_INFO_MMAP_IOMEM       0
 993 #define snd_pcm_lib_mmap_iomem  NULL
 994 #endif
 995
 996 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
 997 {
 998         *max = dma < 4 ? 64 * 1024 : 128 * 1024;
 999 }
1000
1001 /*
1002  *  Misc
1003  */
1004
1005 #define SNDRV_PCM_DEFAULT_CON_SPDIF     (IEC958_AES0_CON_EMPHASIS_NONE|\
1006                                          (IEC958_AES1_CON_ORIGINAL<<8)|\
1007                                          (IEC958_AES1_CON_PCM_CODER<<8)|\
1008                                          (IEC958_AES3_CON_FS_48000<<24))
1009
1010 #endif /* __SOUND_PCM_H */