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 typedef sndrv_pcm_uframes_t snd_pcm_uframes_t;
  32 typedef sndrv_pcm_sframes_t snd_pcm_sframes_t;
  33 typedef enum sndrv_pcm_class snd_pcm_class_t;
  34 typedef enum sndrv_pcm_subclass snd_pcm_subclass_t;
  35 typedef enum sndrv_pcm_stream snd_pcm_stream_t;
  36 typedef enum sndrv_pcm_access snd_pcm_access_t;
  37 typedef enum sndrv_pcm_format snd_pcm_format_t;
  38 typedef enum sndrv_pcm_subformat snd_pcm_subformat_t;
  39 typedef enum sndrv_pcm_state snd_pcm_state_t;
  40 typedef union sndrv_pcm_sync_id snd_pcm_sync_id_t;
  41 typedef struct sndrv_pcm_info snd_pcm_info_t;
  42 typedef enum sndrv_pcm_hw_param snd_pcm_hw_param_t;
  43 typedef struct sndrv_pcm_hw_params snd_pcm_hw_params_t;
  44 typedef enum sndrv_pcm_start snd_pcm_start_t;
  45 typedef enum sndrv_pcm_xrun snd_pcm_xrun_t;
  46 typedef enum sndrv_pcm_tstamp snd_pcm_tstamp_t;
  47 typedef struct sndrv_pcm_sw_params snd_pcm_sw_params_t;
  48 typedef struct sndrv_pcm_channel_info snd_pcm_channel_info_t;
  49 typedef struct sndrv_pcm_status snd_pcm_status_t;
  50 typedef struct sndrv_pcm_mmap_status snd_pcm_mmap_status_t;
  51 typedef struct sndrv_pcm_mmap_control snd_pcm_mmap_control_t;
  52 typedef struct sndrv_mask snd_mask_t;
  53 typedef struct snd_sg_buf snd_pcm_sgbuf_t;
  54
  55 #define snd_pcm_substream_chip(substream) ((substream)->private_data)
  56 #define snd_pcm_chip(pcm) ((pcm)->private_data)
  57
  58 typedef struct _snd_pcm_file snd_pcm_file_t;
  59 typedef struct _snd_pcm_runtime snd_pcm_runtime_t;
  60
  61 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
  62 #include "pcm_oss.h"
  63 #endif
  64
  65 /*
  66  *  Hardware (lowlevel) section
  67  */
  68
  69 typedef struct _snd_pcm_hardware {
  70         unsigned int info;              /* SNDRV_PCM_INFO_* */
  71         u64 formats;                    /* SNDRV_PCM_FMTBIT_* */
  72         unsigned int rates;             /* SNDRV_PCM_RATE_* */
  73         unsigned int rate_min;          /* min rate */
  74         unsigned int rate_max;          /* max rate */
  75         unsigned int channels_min;      /* min channels */
  76         unsigned int channels_max;      /* max channels */
  77         size_t buffer_bytes_max;        /* max buffer size */
  78         size_t period_bytes_min;        /* min period size */
  79         size_t period_bytes_max;        /* max period size */
  80         unsigned int periods_min;       /* min # of periods */
  81         unsigned int periods_max;       /* max # of periods */
  82         size_t fifo_size;               /* fifo size in bytes */
  83 } snd_pcm_hardware_t;
  84
  85 typedef struct _snd_pcm_ops {
  86         int (*open)(snd_pcm_substream_t *substream);
  87         int (*close)(snd_pcm_substream_t *substream);
  88         int (*ioctl)(snd_pcm_substream_t * substream,
  89                      unsigned int cmd, void *arg);
  90         int (*hw_params)(snd_pcm_substream_t * substream, snd_pcm_hw_params_t * params);
  91         int (*hw_free)(snd_pcm_substream_t *substream);
  92         int (*prepare)(snd_pcm_substream_t * substream);
  93         int (*trigger)(snd_pcm_substream_t * substream, int cmd);
  94         snd_pcm_uframes_t (*pointer)(snd_pcm_substream_t * substream);
  95         int (*copy)(snd_pcm_substream_t *substream, int channel, snd_pcm_uframes_t pos,
  96                     void __user *buf, snd_pcm_uframes_t count);
  97         int (*silence)(snd_pcm_substream_t *substream, int channel,
  98                        snd_pcm_uframes_t pos, snd_pcm_uframes_t count);
  99         struct page *(*page)(snd_pcm_substream_t *substream, unsigned long offset);
 100         int (*mmap)(snd_pcm_substream_t *substream, struct vm_area_struct *vma);
 101         int (*ack)(snd_pcm_substream_t *substream);
 102 } snd_pcm_ops_t;
 103
 104 /*
 105  *
 106  */
 107
 108 #define SNDRV_PCM_DEVICES               8
 109
 110 #define SNDRV_PCM_IOCTL1_FALSE          ((void *)0)
 111 #define SNDRV_PCM_IOCTL1_TRUE           ((void *)1)
 112
 113 #define SNDRV_PCM_IOCTL1_RESET          0
 114 #define SNDRV_PCM_IOCTL1_INFO           1
 115 #define SNDRV_PCM_IOCTL1_CHANNEL_INFO   2
 116 #define SNDRV_PCM_IOCTL1_GSTATE         3
 117
 118 #define SNDRV_PCM_TRIGGER_STOP          0
 119 #define SNDRV_PCM_TRIGGER_START         1
 120 #define SNDRV_PCM_TRIGGER_PAUSE_PUSH    3
 121 #define SNDRV_PCM_TRIGGER_PAUSE_RELEASE 4
 122 #define SNDRV_PCM_TRIGGER_SUSPEND       5
 123 #define SNDRV_PCM_TRIGGER_RESUME        6
 124
 125 #define SNDRV_PCM_POS_XRUN              ((snd_pcm_uframes_t)-1)
 126
 127 /* If you change this don't forget to change rates[] table in pcm_native.c */
 128 #define SNDRV_PCM_RATE_5512             (1<<0)          /* 5512Hz */
 129 #define SNDRV_PCM_RATE_8000             (1<<1)          /* 8000Hz */
 130 #define SNDRV_PCM_RATE_11025            (1<<2)          /* 11025Hz */
 131 #define SNDRV_PCM_RATE_16000            (1<<3)          /* 16000Hz */
 132 #define SNDRV_PCM_RATE_22050            (1<<4)          /* 22050Hz */
 133 #define SNDRV_PCM_RATE_32000            (1<<5)          /* 32000Hz */
 134 #define SNDRV_PCM_RATE_44100            (1<<6)          /* 44100Hz */
 135 #define SNDRV_PCM_RATE_48000            (1<<7)          /* 48000Hz */
 136 #define SNDRV_PCM_RATE_64000            (1<<8)          /* 64000Hz */
 137 #define SNDRV_PCM_RATE_88200            (1<<9)          /* 88200Hz */
 138 #define SNDRV_PCM_RATE_96000            (1<<10)         /* 96000Hz */
 139 #define SNDRV_PCM_RATE_176400           (1<<11)         /* 176400Hz */
 140 #define SNDRV_PCM_RATE_192000           (1<<12)         /* 192000Hz */
 141
 142 #define SNDRV_PCM_RATE_CONTINUOUS       (1<<30)         /* continuous range */
 143 #define SNDRV_PCM_RATE_KNOT             (1<<31)         /* supports more non-continuos rates */
 144
 145 #define SNDRV_PCM_RATE_8000_44100       (SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_11025|\
 146                                          SNDRV_PCM_RATE_16000|SNDRV_PCM_RATE_22050|\
 147                                          SNDRV_PCM_RATE_32000|SNDRV_PCM_RATE_44100)
 148 #define SNDRV_PCM_RATE_8000_48000       (SNDRV_PCM_RATE_8000_44100|SNDRV_PCM_RATE_48000)
 149 #define SNDRV_PCM_RATE_8000_96000       (SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_64000|\
 150                                          SNDRV_PCM_RATE_88200|SNDRV_PCM_RATE_96000)
 151 #define SNDRV_PCM_RATE_8000_192000      (SNDRV_PCM_RATE_8000_96000|SNDRV_PCM_RATE_176400|\
 152                                          SNDRV_PCM_RATE_192000)
 153 #define SNDRV_PCM_FMTBIT_S8             (1ULL << SNDRV_PCM_FORMAT_S8)
 154 #define SNDRV_PCM_FMTBIT_U8             (1ULL << SNDRV_PCM_FORMAT_U8)
 155 #define SNDRV_PCM_FMTBIT_S16_LE         (1ULL << SNDRV_PCM_FORMAT_S16_LE)
 156 #define SNDRV_PCM_FMTBIT_S16_BE         (1ULL << SNDRV_PCM_FORMAT_S16_BE)
 157 #define SNDRV_PCM_FMTBIT_U16_LE         (1ULL << SNDRV_PCM_FORMAT_U16_LE)
 158 #define SNDRV_PCM_FMTBIT_U16_BE         (1ULL << SNDRV_PCM_FORMAT_U16_BE)
 159 #define SNDRV_PCM_FMTBIT_S24_LE         (1ULL << SNDRV_PCM_FORMAT_S24_LE)
 160 #define SNDRV_PCM_FMTBIT_S24_BE         (1ULL << SNDRV_PCM_FORMAT_S24_BE)
 161 #define SNDRV_PCM_FMTBIT_U24_LE         (1ULL << SNDRV_PCM_FORMAT_U24_LE)
 162 #define SNDRV_PCM_FMTBIT_U24_BE         (1ULL << SNDRV_PCM_FORMAT_U24_BE)
 163 #define SNDRV_PCM_FMTBIT_S32_LE         (1ULL << SNDRV_PCM_FORMAT_S32_LE)
 164 #define SNDRV_PCM_FMTBIT_S32_BE         (1ULL << SNDRV_PCM_FORMAT_S32_BE)
 165 #define SNDRV_PCM_FMTBIT_U32_LE         (1ULL << SNDRV_PCM_FORMAT_U32_LE)
 166 #define SNDRV_PCM_FMTBIT_U32_BE         (1ULL << SNDRV_PCM_FORMAT_U32_BE)
 167 #define SNDRV_PCM_FMTBIT_FLOAT_LE       (1ULL << SNDRV_PCM_FORMAT_FLOAT_LE)
 168 #define SNDRV_PCM_FMTBIT_FLOAT_BE       (1ULL << SNDRV_PCM_FORMAT_FLOAT_BE)
 169 #define SNDRV_PCM_FMTBIT_FLOAT64_LE     (1ULL << SNDRV_PCM_FORMAT_FLOAT64_LE)
 170 #define SNDRV_PCM_FMTBIT_FLOAT64_BE     (1ULL << SNDRV_PCM_FORMAT_FLOAT64_BE)
 171 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE (1ULL << SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE)
 172 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE (1ULL << SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE)
 173 #define SNDRV_PCM_FMTBIT_MU_LAW         (1ULL << SNDRV_PCM_FORMAT_MU_LAW)
 174 #define SNDRV_PCM_FMTBIT_A_LAW          (1ULL << SNDRV_PCM_FORMAT_A_LAW)
 175 #define SNDRV_PCM_FMTBIT_IMA_ADPCM      (1ULL << SNDRV_PCM_FORMAT_IMA_ADPCM)
 176 #define SNDRV_PCM_FMTBIT_MPEG           (1ULL << SNDRV_PCM_FORMAT_MPEG)
 177 #define SNDRV_PCM_FMTBIT_GSM            (1ULL << SNDRV_PCM_FORMAT_GSM)
 178 #define SNDRV_PCM_FMTBIT_SPECIAL        (1ULL << SNDRV_PCM_FORMAT_SPECIAL)
 179 #define SNDRV_PCM_FMTBIT_S24_3LE        (1ULL << SNDRV_PCM_FORMAT_S24_3LE)
 180 #define SNDRV_PCM_FMTBIT_U24_3LE        (1ULL << SNDRV_PCM_FORMAT_U24_3LE)
 181 #define SNDRV_PCM_FMTBIT_S24_3BE        (1ULL << SNDRV_PCM_FORMAT_S24_3BE)
 182 #define SNDRV_PCM_FMTBIT_U24_3BE        (1ULL << SNDRV_PCM_FORMAT_U24_3BE)
 183 #define SNDRV_PCM_FMTBIT_S20_3LE        (1ULL << SNDRV_PCM_FORMAT_S20_3LE)
 184 #define SNDRV_PCM_FMTBIT_U20_3LE        (1ULL << SNDRV_PCM_FORMAT_U20_3LE)
 185 #define SNDRV_PCM_FMTBIT_S20_3BE        (1ULL << SNDRV_PCM_FORMAT_S20_3BE)
 186 #define SNDRV_PCM_FMTBIT_U20_3BE        (1ULL << SNDRV_PCM_FORMAT_U20_3BE)
 187 #define SNDRV_PCM_FMTBIT_S18_3LE        (1ULL << SNDRV_PCM_FORMAT_S18_3LE)
 188 #define SNDRV_PCM_FMTBIT_U18_3LE        (1ULL << SNDRV_PCM_FORMAT_U18_3LE)
 189 #define SNDRV_PCM_FMTBIT_S18_3BE        (1ULL << SNDRV_PCM_FORMAT_S18_3BE)
 190 #define SNDRV_PCM_FMTBIT_U18_3BE        (1ULL << SNDRV_PCM_FORMAT_U18_3BE)
 191
 192 #ifdef SNDRV_LITTLE_ENDIAN
 193 #define SNDRV_PCM_FMTBIT_S16            SNDRV_PCM_FMTBIT_S16_LE
 194 #define SNDRV_PCM_FMTBIT_U16            SNDRV_PCM_FMTBIT_U16_LE
 195 #define SNDRV_PCM_FMTBIT_S24            SNDRV_PCM_FMTBIT_S24_LE
 196 #define SNDRV_PCM_FMTBIT_U24            SNDRV_PCM_FMTBIT_U24_LE
 197 #define SNDRV_PCM_FMTBIT_S32            SNDRV_PCM_FMTBIT_S32_LE
 198 #define SNDRV_PCM_FMTBIT_U32            SNDRV_PCM_FMTBIT_U32_LE
 199 #define SNDRV_PCM_FMTBIT_FLOAT          SNDRV_PCM_FMTBIT_FLOAT_LE
 200 #define SNDRV_PCM_FMTBIT_FLOAT64        SNDRV_PCM_FMTBIT_FLOAT64_LE
 201 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE
 202 #endif
 203 #ifdef SNDRV_BIG_ENDIAN
 204 #define SNDRV_PCM_FMTBIT_S16            SNDRV_PCM_FMTBIT_S16_BE
 205 #define SNDRV_PCM_FMTBIT_U16            SNDRV_PCM_FMTBIT_U16_BE
 206 #define SNDRV_PCM_FMTBIT_S24            SNDRV_PCM_FMTBIT_S24_BE
 207 #define SNDRV_PCM_FMTBIT_U24            SNDRV_PCM_FMTBIT_U24_BE
 208 #define SNDRV_PCM_FMTBIT_S32            SNDRV_PCM_FMTBIT_S32_BE
 209 #define SNDRV_PCM_FMTBIT_U32            SNDRV_PCM_FMTBIT_U32_BE
 210 #define SNDRV_PCM_FMTBIT_FLOAT          SNDRV_PCM_FMTBIT_FLOAT_BE
 211 #define SNDRV_PCM_FMTBIT_FLOAT64        SNDRV_PCM_FMTBIT_FLOAT64_BE
 212 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE
 213 #endif
 214
 215 struct _snd_pcm_file {
 216         snd_pcm_substream_t * substream;
 217         struct _snd_pcm_file * next;
 218 };
 219
 220 typedef struct _snd_pcm_hw_rule snd_pcm_hw_rule_t;
 221
 222 typedef int (*snd_pcm_hw_rule_func_t)(snd_pcm_hw_params_t *params,
 223                                       snd_pcm_hw_rule_t *rule);
 224
 225 struct _snd_pcm_hw_rule {
 226         unsigned int cond;
 227         snd_pcm_hw_rule_func_t func;
 228         int var;
 229         int deps[4];
 230         void *private;
 231 };
 232
 233 typedef struct _snd_pcm_hw_constraints {
 234         snd_mask_t masks[SNDRV_PCM_HW_PARAM_LAST_MASK -
 235                          SNDRV_PCM_HW_PARAM_FIRST_MASK + 1];
 236         snd_interval_t intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL -
 237                              SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
 238         unsigned int rules_num;
 239         unsigned int rules_all;
 240         snd_pcm_hw_rule_t *rules;
 241 } snd_pcm_hw_constraints_t;
 242
 243 static inline snd_mask_t *constrs_mask(snd_pcm_hw_constraints_t *constrs,
 244                                        snd_pcm_hw_param_t var)
 245 {
 246         return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 247 }
 248
 249 static inline snd_interval_t *constrs_interval(snd_pcm_hw_constraints_t *constrs,
 250                                           snd_pcm_hw_param_t var)
 251 {
 252         return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 253 }
 254
 255 typedef struct {
 256         unsigned int num;
 257         unsigned int den_min, den_max, den_step;
 258 } ratnum_t;
 259
 260 typedef struct {
 261         unsigned int num_min, num_max, num_step;
 262         unsigned int den;
 263 } ratden_t;
 264
 265 typedef struct {
 266         int nrats;
 267         ratnum_t *rats;
 268 } snd_pcm_hw_constraint_ratnums_t;
 269
 270 typedef struct {
 271         int nrats;
 272         ratden_t *rats;
 273 } snd_pcm_hw_constraint_ratdens_t;
 274
 275 typedef struct {
 276         unsigned int count;
 277         unsigned int *list;
 278         unsigned int mask;
 279 } snd_pcm_hw_constraint_list_t;
 280
 281 struct _snd_pcm_runtime {
 282         /* -- Status -- */
 283         snd_pcm_substream_t *trigger_master;
 284         snd_timestamp_t trigger_tstamp; /* trigger timestamp */
 285         int overrange;
 286         snd_pcm_uframes_t avail_max;
 287         snd_pcm_uframes_t hw_ptr_base;  /* Position at buffer restart */
 288         snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time*/
 289
 290         /* -- HW params -- */
 291         snd_pcm_access_t access;        /* access mode */
 292         snd_pcm_format_t format;        /* SNDRV_PCM_FORMAT_* */
 293         snd_pcm_subformat_t subformat;  /* subformat */
 294         unsigned int rate;              /* rate in Hz */
 295         unsigned int channels;          /* channels */
 296         snd_pcm_uframes_t period_size;  /* period size */
 297         unsigned int periods;           /* periods */
 298         snd_pcm_uframes_t buffer_size;  /* buffer size */
 299         unsigned int tick_time;         /* tick time */
 300         snd_pcm_uframes_t min_align;    /* Min alignment for the format */
 301         size_t byte_align;
 302         unsigned int frame_bits;
 303         unsigned int sample_bits;
 304         unsigned int info;
 305         unsigned int rate_num;
 306         unsigned int rate_den;
 307
 308         /* -- SW params -- */
 309         int tstamp_timespec;            /* use timeval (0) or timespec (1) */
 310         snd_pcm_tstamp_t tstamp_mode;   /* mmap timestamp is updated */
 311         unsigned int period_step;
 312         unsigned int sleep_min;         /* min ticks to sleep */
 313         snd_pcm_uframes_t xfer_align;   /* xfer size need to be a multiple */
 314         snd_pcm_uframes_t start_threshold;
 315         snd_pcm_uframes_t stop_threshold;
 316         snd_pcm_uframes_t silence_threshold; /* Silence filling happens when
 317                                                 noise is nearest than this */
 318         snd_pcm_uframes_t silence_size; /* Silence filling size */
 319         snd_pcm_uframes_t boundary;     /* pointers wrap point */
 320
 321         snd_pcm_uframes_t silence_start; /* starting pointer to silence area */
 322         snd_pcm_uframes_t silence_filled; /* size filled with silence */
 323
 324         snd_pcm_sync_id_t sync;         /* hardware synchronization ID */
 325
 326         /* -- mmap -- */
 327         volatile snd_pcm_mmap_status_t *status;
 328         volatile snd_pcm_mmap_control_t *control;
 329         atomic_t mmap_count;
 330
 331         /* -- locking / scheduling -- */
 332         wait_queue_head_t sleep;
 333         struct timer_list tick_timer;
 334         struct fasync_struct *fasync;
 335
 336         /* -- private section -- */
 337         void *private_data;
 338         void (*private_free)(snd_pcm_runtime_t *runtime);
 339
 340         /* -- hardware description -- */
 341         snd_pcm_hardware_t hw;
 342         snd_pcm_hw_constraints_t hw_constraints;
 343
 344         /* -- interrupt callbacks -- */
 345         void (*transfer_ack_begin)(snd_pcm_substream_t *substream);
 346         void (*transfer_ack_end)(snd_pcm_substream_t *substream);
 347
 348         /* -- timer -- */
 349         unsigned int timer_resolution;  /* timer resolution */
 350
 351         /* -- DMA -- */
 352         unsigned char *dma_area;        /* DMA area */
 353         dma_addr_t dma_addr;            /* physical bus address (not accessible from main CPU) */
 354         size_t dma_bytes;               /* size of DMA area */
 355
 356         struct snd_dma_buffer *dma_buffer_p;    /* allocated buffer */
 357
 358 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 359         /* -- OSS things -- */
 360         snd_pcm_oss_runtime_t oss;
 361 #endif
 362 };
 363
 364 typedef struct _snd_pcm_group {         /* keep linked substreams */
 365         spinlock_t lock;
 366         struct list_head substreams;
 367         int count;
 368 } snd_pcm_group_t;
 369
 370 struct _snd_pcm_substream {
 371         snd_pcm_t *pcm;
 372         snd_pcm_str_t *pstr;
 373         void *private_data;             /* copied from pcm->private_data */
 374         int number;
 375         char name[32];                  /* substream name */
 376         int stream;                     /* stream (direction) */
 377         size_t buffer_bytes_max;        /* limit ring buffer size */
 378         struct snd_dma_buffer dma_buffer;
 379         unsigned int dma_buf_id;
 380         size_t dma_max;
 381         /* -- hardware operations -- */
 382         unsigned int open_flag: 1;      /* lowlevel device has been opened */
 383         snd_pcm_ops_t *ops;
 384         /* -- runtime information -- */
 385         snd_pcm_runtime_t *runtime;
 386         /* -- timer section -- */
 387         snd_timer_t *timer;             /* timer */
 388         unsigned timer_running: 1;      /* time is running */
 389         spinlock_t timer_lock;
 390         /* -- next substream -- */
 391         snd_pcm_substream_t *next;
 392         /* -- linked substreams -- */
 393         struct list_head link_list;     /* linked list member */
 394         snd_pcm_group_t self_group;     /* fake group for non linked substream (with substream lock inside) */
 395         snd_pcm_group_t *group;         /* pointer to current group */
 396         /* -- assigned files -- */
 397         snd_pcm_file_t *file;
 398         struct file *ffile;
 399 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 400         /* -- OSS things -- */
 401         snd_pcm_oss_substream_t oss;
 402 #endif
 403         snd_info_entry_t *proc_root;
 404         snd_info_entry_t *proc_info_entry;
 405         snd_info_entry_t *proc_hw_params_entry;
 406         snd_info_entry_t *proc_sw_params_entry;
 407         snd_info_entry_t *proc_status_entry;
 408         snd_info_entry_t *proc_prealloc_entry;
 409         /* misc flags */
 410         unsigned int no_mmap_ctrl: 1;
 411 };
 412
 413 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 414 #define SUBSTREAM_BUSY(substream) ((substream)->file != NULL || ((substream)->oss.file != NULL))
 415 #else
 416 #define SUBSTREAM_BUSY(substream) ((substream)->file != NULL)
 417 #endif
 418
 419
 420 struct _snd_pcm_str {
 421         int stream;                             /* stream (direction) */
 422         snd_pcm_t *pcm;
 423         /* -- substreams -- */
 424         unsigned int substream_count;
 425         unsigned int substream_opened;
 426         snd_pcm_substream_t *substream;
 427 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 428         /* -- OSS things -- */
 429         snd_pcm_oss_stream_t oss;
 430 #endif
 431         snd_pcm_file_t *files;
 432         snd_minor_t *reg;
 433         snd_info_entry_t *proc_root;
 434         snd_info_entry_t *proc_info_entry;
 435 #ifdef CONFIG_SND_DEBUG
 436         unsigned int xrun_debug;        /* 0 = disabled, 1 = verbose, 2 = stacktrace */
 437         snd_info_entry_t *proc_xrun_debug_entry;
 438 #endif
 439 };
 440
 441 struct _snd_pcm {
 442         snd_card_t *card;
 443         unsigned int device;    /* device number */
 444         unsigned int info_flags;
 445         unsigned short dev_class;
 446         unsigned short dev_subclass;
 447         char id[64];
 448         char name[80];
 449         snd_pcm_str_t streams[2];
 450         struct semaphore open_mutex;
 451         wait_queue_head_t open_wait;
 452         void *private_data;
 453         void (*private_free) (snd_pcm_t *pcm);
 454 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 455         snd_pcm_oss_t oss;
 456 #endif
 457 };
 458
 459 typedef struct _snd_pcm_notify {
 460         int (*n_register) (snd_pcm_t * pcm);
 461         int (*n_disconnect) (snd_pcm_t * pcm);
 462         int (*n_unregister) (snd_pcm_t * pcm);
 463         struct list_head list;
 464 } snd_pcm_notify_t;
 465
 466 /*
 467  *  Registering
 468  */
 469
 470 extern snd_pcm_t *snd_pcm_devices[];
 471 extern snd_minor_t snd_pcm_reg[2];
 472
 473 int snd_pcm_new(snd_card_t * card, char *id, int device,
 474                 int playback_count, int capture_count,
 475                 snd_pcm_t **rpcm);
 476 int snd_pcm_new_stream(snd_pcm_t *pcm, int stream, int substream_count);
 477
 478 int snd_pcm_notify(snd_pcm_notify_t *notify, int nfree);
 479
 480 /*
 481  *  Native I/O
 482  */
 483
 484 extern rwlock_t snd_pcm_link_rwlock;
 485
 486 int snd_pcm_info(snd_pcm_substream_t * substream, snd_pcm_info_t *info);
 487 int snd_pcm_info_user(snd_pcm_substream_t * substream, snd_pcm_info_t __user *info);
 488 int snd_pcm_status(snd_pcm_substream_t * substream, snd_pcm_status_t *status);
 489 int snd_pcm_prepare(snd_pcm_substream_t *substream);
 490 int snd_pcm_start(snd_pcm_substream_t *substream);
 491 int snd_pcm_stop(snd_pcm_substream_t *substream, int status);
 492 int snd_pcm_drain_done(snd_pcm_substream_t *substream);
 493 #ifdef CONFIG_PM
 494 int snd_pcm_suspend(snd_pcm_substream_t *substream);
 495 int snd_pcm_suspend_all(snd_pcm_t *pcm);
 496 #endif
 497 int snd_pcm_kernel_playback_ioctl(snd_pcm_substream_t *substream, unsigned int cmd, void *arg);
 498 int snd_pcm_kernel_capture_ioctl(snd_pcm_substream_t *substream, unsigned int cmd, void *arg);
 499 int snd_pcm_kernel_ioctl(snd_pcm_substream_t *substream, unsigned int cmd, void *arg);
 500 int snd_pcm_open_substream(snd_pcm_t *pcm, int stream, snd_pcm_substream_t **rsubstream);
 501 void snd_pcm_release_substream(snd_pcm_substream_t *substream);
 502 void snd_pcm_vma_notify_data(void *client, void *data);
 503 int snd_pcm_mmap_data(snd_pcm_substream_t *substream, struct file *file, struct vm_area_struct *area);
 504
 505 #if BITS_PER_LONG >= 64
 506
 507 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
 508 {
 509         *rem = *n % div;
 510         *n /= div;
 511 }
 512
 513 #elif defined(i386)
 514
 515 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
 516 {
 517         u_int32_t low, high;
 518         low = *n & 0xffffffff;
 519         high = *n >> 32;
 520         if (high) {
 521                 u_int32_t high1 = high % div;
 522                 high /= div;
 523                 asm("divl %2":"=a" (low), "=d" (*rem):"rm" (div), "a" (low), "d" (high1));
 524                 *n = (u_int64_t)high << 32 | low;
 525         } else {
 526                 *n = low / div;
 527                 *rem = low % div;
 528         }
 529 }
 530 #else
 531
 532 static inline void divl(u_int32_t high, u_int32_t low,
 533                         u_int32_t div,
 534                         u_int32_t *q, u_int32_t *r)
 535 {
 536         u_int64_t n = (u_int64_t)high << 32 | low;
 537         u_int64_t d = (u_int64_t)div << 31;
 538         u_int32_t q1 = 0;
 539         int c = 32;
 540         while (n > 0xffffffffU) {
 541                 q1 <<= 1;
 542                 if (n >= d) {
 543                         n -= d;
 544                         q1 |= 1;
 545                 }
 546                 d >>= 1;
 547                 c--;
 548         }
 549         q1 <<= c;
 550         if (n) {
 551                 low = n;
 552                 *q = q1 | (low / div);
 553                 *r = low % div;
 554         } else {
 555                 *r = 0;
 556                 *q = q1;
 557         }
 558         return;
 559 }
 560
 561 static inline void div64_32(u_int64_t *n, u_int32_t div, u_int32_t *rem)
 562 {
 563         u_int32_t low, high;
 564         low = *n & 0xffffffff;
 565         high = *n >> 32;
 566         if (high) {
 567                 u_int32_t high1 = high % div;
 568                 u_int32_t low1 = low;
 569                 high /= div;
 570                 divl(high1, low1, div, &low, rem);
 571                 *n = (u_int64_t)high << 32 | low;
 572         } else {
 573                 *n = low / div;
 574                 *rem = low % div;
 575         }
 576 }
 577 #endif
 578
 579 /*
 580  *  PCM library
 581  */
 582
 583 static inline int snd_pcm_stream_linked(snd_pcm_substream_t *substream)
 584 {
 585         return substream->group != &substream->self_group;
 586 }
 587
 588 static inline void snd_pcm_stream_lock(snd_pcm_substream_t *substream)
 589 {
 590         read_lock(&snd_pcm_link_rwlock);
 591         spin_lock(&substream->self_group.lock);
 592 }
 593
 594 static inline void snd_pcm_stream_unlock(snd_pcm_substream_t *substream)
 595 {
 596         spin_unlock(&substream->self_group.lock);
 597         read_unlock(&snd_pcm_link_rwlock);
 598 }
 599
 600 static inline void snd_pcm_stream_lock_irq(snd_pcm_substream_t *substream)
 601 {
 602         read_lock_irq(&snd_pcm_link_rwlock);
 603         spin_lock(&substream->self_group.lock);
 604 }
 605
 606 static inline void snd_pcm_stream_unlock_irq(snd_pcm_substream_t *substream)
 607 {
 608         spin_unlock(&substream->self_group.lock);
 609         read_unlock_irq(&snd_pcm_link_rwlock);
 610 }
 611
 612 #define snd_pcm_stream_lock_irqsave(substream, flags) \
 613 do { \
 614         read_lock_irqsave(&snd_pcm_link_rwlock, (flags)); \
 615         spin_lock(&substream->self_group.lock); \
 616 } while (0)
 617
 618 #define snd_pcm_stream_unlock_irqrestore(substream, flags) \
 619 do { \
 620         spin_unlock(&substream->self_group.lock); \
 621         read_unlock_irqrestore(&snd_pcm_link_rwlock, (flags)); \
 622 } while (0)
 623
 624 #define snd_pcm_group_for_each(pos, substream) \
 625         list_for_each(pos, &substream->group->substreams)
 626
 627 #define snd_pcm_group_substream_entry(pos) \
 628         list_entry(pos, snd_pcm_substream_t, link_list)
 629
 630 static inline int snd_pcm_running(snd_pcm_substream_t *substream)
 631 {
 632         return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 633                 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
 634                  substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
 635 }
 636
 637 static inline ssize_t bytes_to_samples(snd_pcm_runtime_t *runtime, ssize_t size)
 638 {
 639         return size * 8 / runtime->sample_bits;
 640 }
 641
 642 static inline snd_pcm_sframes_t bytes_to_frames(snd_pcm_runtime_t *runtime, ssize_t size)
 643 {
 644         return size * 8 / runtime->frame_bits;
 645 }
 646
 647 static inline ssize_t samples_to_bytes(snd_pcm_runtime_t *runtime, ssize_t size)
 648 {
 649         return size * runtime->sample_bits / 8;
 650 }
 651
 652 static inline ssize_t frames_to_bytes(snd_pcm_runtime_t *runtime, snd_pcm_sframes_t size)
 653 {
 654         return size * runtime->frame_bits / 8;
 655 }
 656
 657 static inline int frame_aligned(snd_pcm_runtime_t *runtime, ssize_t bytes)
 658 {
 659         return bytes % runtime->byte_align == 0;
 660 }
 661
 662 static inline size_t snd_pcm_lib_buffer_bytes(snd_pcm_substream_t *substream)
 663 {
 664         snd_pcm_runtime_t *runtime = substream->runtime;
 665         return frames_to_bytes(runtime, runtime->buffer_size);
 666 }
 667
 668 static inline size_t snd_pcm_lib_period_bytes(snd_pcm_substream_t *substream)
 669 {
 670         snd_pcm_runtime_t *runtime = substream->runtime;
 671         return frames_to_bytes(runtime, runtime->period_size);
 672 }
 673
 674 /*
 675  *  result is: 0 ... (boundary - 1)
 676  */
 677 static inline snd_pcm_uframes_t snd_pcm_playback_avail(snd_pcm_runtime_t *runtime)
 678 {
 679         snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
 680         if (avail < 0)
 681                 avail += runtime->boundary;
 682         else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
 683                 avail -= runtime->boundary;
 684         return avail;
 685 }
 686
 687 /*
 688  *  result is: 0 ... (boundary - 1)
 689  */
 690 static inline snd_pcm_uframes_t snd_pcm_capture_avail(snd_pcm_runtime_t *runtime)
 691 {
 692         snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
 693         if (avail < 0)
 694                 avail += runtime->boundary;
 695         return avail;
 696 }
 697
 698 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(snd_pcm_runtime_t *runtime)
 699 {
 700         return runtime->buffer_size - snd_pcm_playback_avail(runtime);
 701 }
 702
 703 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(snd_pcm_runtime_t *runtime)
 704 {
 705         return runtime->buffer_size - snd_pcm_capture_avail(runtime);
 706 }
 707
 708 /**
 709  * snd_pcm_playback_ready - check whether the playback buffer is available
 710  * @substream: the pcm substream instance
 711  *
 712  * Checks whether enough free space is available on the playback buffer.
 713  *
 714  * Returns non-zero if available, or zero if not.
 715  */
 716 static inline int snd_pcm_playback_ready(snd_pcm_substream_t *substream)
 717 {
 718         snd_pcm_runtime_t *runtime = substream->runtime;
 719         return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
 720 }
 721
 722 /**
 723  * snd_pcm_capture_ready - check whether the capture buffer is available
 724  * @substream: the pcm substream instance
 725  *
 726  * Checks whether enough capture data is available on the capture buffer.
 727  *
 728  * Returns non-zero if available, or zero if not.
 729  */
 730 static inline int snd_pcm_capture_ready(snd_pcm_substream_t *substream)
 731 {
 732         snd_pcm_runtime_t *runtime = substream->runtime;
 733         return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
 734 }
 735
 736 /**
 737  * snd_pcm_playback_data - check whether any data exists on the playback buffer
 738  * @substream: the pcm substream instance
 739  *
 740  * Checks whether any data exists on the playback buffer. If stop_threshold
 741  * is bigger or equal to boundary, then this function returns always non-zero.
 742  *
 743  * Returns non-zero if exists, or zero if not.
 744  */
 745 static inline int snd_pcm_playback_data(snd_pcm_substream_t *substream)
 746 {
 747         snd_pcm_runtime_t *runtime = substream->runtime;
 748
 749         if (runtime->stop_threshold >= runtime->boundary)
 750                 return 1;
 751         return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
 752 }
 753
 754 /**
 755  * snd_pcm_playback_empty - check whether the playback buffer is empty
 756  * @substream: the pcm substream instance
 757  *
 758  * Checks whether the playback buffer is empty.
 759  *
 760  * Returns non-zero if empty, or zero if not.
 761  */
 762 static inline int snd_pcm_playback_empty(snd_pcm_substream_t *substream)
 763 {
 764         snd_pcm_runtime_t *runtime = substream->runtime;
 765         return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
 766 }
 767
 768 /**
 769  * snd_pcm_capture_empty - check whether the capture buffer is empty
 770  * @substream: the pcm substream instance
 771  *
 772  * Checks whether the capture buffer is empty.
 773  *
 774  * Returns non-zero if empty, or zero if not.
 775  */
 776 static inline int snd_pcm_capture_empty(snd_pcm_substream_t *substream)
 777 {
 778         snd_pcm_runtime_t *runtime = substream->runtime;
 779         return snd_pcm_capture_avail(runtime) == 0;
 780 }
 781
 782 static inline void snd_pcm_trigger_done(snd_pcm_substream_t *substream,
 783                                         snd_pcm_substream_t *master)
 784 {
 785         substream->runtime->trigger_master = master;
 786 }
 787
 788 static inline int hw_is_mask(int var)
 789 {
 790         return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
 791                 var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
 792 }
 793
 794 static inline int hw_is_interval(int var)
 795 {
 796         return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
 797                 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
 798 }
 799
 800 static inline snd_mask_t *hw_param_mask(snd_pcm_hw_params_t *params,
 801                                      snd_pcm_hw_param_t var)
 802 {
 803         return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 804 }
 805
 806 static inline snd_interval_t *hw_param_interval(snd_pcm_hw_params_t *params,
 807                                              snd_pcm_hw_param_t var)
 808 {
 809         return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 810 }
 811
 812 static inline const snd_mask_t *hw_param_mask_c(const snd_pcm_hw_params_t *params,
 813                                              snd_pcm_hw_param_t var)
 814 {
 815         return (const snd_mask_t *)hw_param_mask((snd_pcm_hw_params_t*) params, var);
 816 }
 817
 818 static inline const snd_interval_t *hw_param_interval_c(const snd_pcm_hw_params_t *params,
 819                                                      snd_pcm_hw_param_t var)
 820 {
 821         return (const snd_interval_t *)hw_param_interval((snd_pcm_hw_params_t*) params, var);
 822 }
 823
 824 #define params_access(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_ACCESS))
 825 #define params_format(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_FORMAT))
 826 #define params_subformat(p) snd_mask_min(hw_param_mask((p), SNDRV_PCM_HW_PARAM_SUBFORMAT))
 827 #define params_channels(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_CHANNELS)->min
 828 #define params_rate(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_RATE)->min
 829 #define params_period_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min
 830 #define params_period_bytes(p) ((params_period_size(p)*snd_pcm_format_physical_width(params_format(p))*params_channels(p))/8)
 831 #define params_periods(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_PERIODS)->min
 832 #define params_buffer_size(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min
 833 #define params_buffer_bytes(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min
 834 #define params_tick_time(p) hw_param_interval((p), SNDRV_PCM_HW_PARAM_TICK_TIME)->min
 835
 836
 837 int snd_interval_refine(snd_interval_t *i, const snd_interval_t *v);
 838 void snd_interval_mul(const snd_interval_t *a, const snd_interval_t *b, snd_interval_t *c);
 839 void snd_interval_div(const snd_interval_t *a, const snd_interval_t *b, snd_interval_t *c);
 840 void snd_interval_muldivk(const snd_interval_t *a, const snd_interval_t *b,
 841                           unsigned int k, snd_interval_t *c);
 842 void snd_interval_mulkdiv(const snd_interval_t *a, unsigned int k,
 843                           const snd_interval_t *b, snd_interval_t *c);
 844 int snd_interval_list(snd_interval_t *i, unsigned int count, unsigned int *list, unsigned int mask);
 845 int snd_interval_ratnum(snd_interval_t *i,
 846                         unsigned int rats_count, ratnum_t *rats,
 847                         unsigned int *nump, unsigned int *denp);
 848
 849 void _snd_pcm_hw_params_any(snd_pcm_hw_params_t *params);
 850 void _snd_pcm_hw_param_setempty(snd_pcm_hw_params_t *params, snd_pcm_hw_param_t var);
 851 int snd_pcm_hw_param_near(snd_pcm_substream_t *substream,
 852                           snd_pcm_hw_params_t *params,
 853                           snd_pcm_hw_param_t var,
 854                           unsigned int val, int *dir);
 855 int snd_pcm_hw_param_set(snd_pcm_substream_t *pcm,
 856                          snd_pcm_hw_params_t *params,
 857                          snd_pcm_hw_param_t var,
 858                          unsigned int val, int dir);
 859 int snd_pcm_hw_params_choose(snd_pcm_substream_t *substream, snd_pcm_hw_params_t *params);
 860
 861 int snd_pcm_hw_refine(snd_pcm_substream_t *substream, snd_pcm_hw_params_t *params);
 862
 863 int snd_pcm_hw_constraints_init(snd_pcm_substream_t *substream);
 864 int snd_pcm_hw_constraints_complete(snd_pcm_substream_t *substream);
 865
 866 int snd_pcm_hw_constraint_mask(snd_pcm_runtime_t *runtime, snd_pcm_hw_param_t var,
 867                                u_int32_t mask);
 868 int snd_pcm_hw_constraint_mask64(snd_pcm_runtime_t *runtime, snd_pcm_hw_param_t var,
 869                                  u_int64_t mask);
 870 int snd_pcm_hw_constraint_minmax(snd_pcm_runtime_t *runtime, snd_pcm_hw_param_t var,
 871                                  unsigned int min, unsigned int max);
 872 int snd_pcm_hw_constraint_integer(snd_pcm_runtime_t *runtime, snd_pcm_hw_param_t var);
 873 int snd_pcm_hw_constraint_list(snd_pcm_runtime_t *runtime,
 874                                unsigned int cond,
 875                                snd_pcm_hw_param_t var,
 876                                snd_pcm_hw_constraint_list_t *l);
 877 int snd_pcm_hw_constraint_ratnums(snd_pcm_runtime_t *runtime,
 878                                   unsigned int cond,
 879                                   snd_pcm_hw_param_t var,
 880                                   snd_pcm_hw_constraint_ratnums_t *r);
 881 int snd_pcm_hw_constraint_ratdens(snd_pcm_runtime_t *runtime,
 882                                   unsigned int cond,
 883                                   snd_pcm_hw_param_t var,
 884                                   snd_pcm_hw_constraint_ratdens_t *r);
 885 int snd_pcm_hw_constraint_msbits(snd_pcm_runtime_t *runtime,
 886                                  unsigned int cond,
 887                                  unsigned int width,
 888                                  unsigned int msbits);
 889 int snd_pcm_hw_constraint_step(snd_pcm_runtime_t *runtime,
 890                                unsigned int cond,
 891                                snd_pcm_hw_param_t var,
 892                                unsigned long step);
 893 int snd_pcm_hw_constraint_pow2(snd_pcm_runtime_t *runtime,
 894                                unsigned int cond,
 895                                snd_pcm_hw_param_t var);
 896 int snd_pcm_hw_rule_add(snd_pcm_runtime_t *runtime,
 897                         unsigned int cond,
 898                         int var,
 899                         snd_pcm_hw_rule_func_t func, void *private,
 900                         int dep, ...);
 901
 902 int snd_pcm_format_signed(snd_pcm_format_t format);
 903 int snd_pcm_format_unsigned(snd_pcm_format_t format);
 904 int snd_pcm_format_linear(snd_pcm_format_t format);
 905 int snd_pcm_format_little_endian(snd_pcm_format_t format);
 906 int snd_pcm_format_big_endian(snd_pcm_format_t format);
 907 /**
 908  * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
 909  * @format: the format to check
 910  *
 911  * Returns 1 if the given PCM format is CPU-endian, 0 if
 912  * opposite, or a negative error code if endian not specified.
 913  */
 914 /* int snd_pcm_format_cpu_endian(snd_pcm_format_t format); */
 915 #ifdef SNDRV_LITTLE_ENDIAN
 916 #define snd_pcm_format_cpu_endian       snd_pcm_format_little_endian
 917 #else
 918 #define snd_pcm_format_cpu_endian       snd_pcm_format_big_endian
 919 #endif
 920 int snd_pcm_format_width(snd_pcm_format_t format);                      /* in bits */
 921 int snd_pcm_format_physical_width(snd_pcm_format_t format);             /* in bits */
 922 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
 923 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
 924 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
 925 snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsignd, int big_endian);
 926 const char *snd_pcm_format_name(snd_pcm_format_t format);
 927
 928 void snd_pcm_set_ops(snd_pcm_t * pcm, int direction, snd_pcm_ops_t *ops);
 929 void snd_pcm_set_sync(snd_pcm_substream_t * substream);
 930 int snd_pcm_lib_interleave_len(snd_pcm_substream_t *substream);
 931 int snd_pcm_lib_ioctl(snd_pcm_substream_t *substream,
 932                       unsigned int cmd, void *arg);
 933 int snd_pcm_update_hw_ptr(snd_pcm_substream_t *substream);
 934 int snd_pcm_playback_xrun_check(snd_pcm_substream_t *substream);
 935 int snd_pcm_capture_xrun_check(snd_pcm_substream_t *substream);
 936 int snd_pcm_playback_xrun_asap(snd_pcm_substream_t *substream);
 937 int snd_pcm_capture_xrun_asap(snd_pcm_substream_t *substream);
 938 void snd_pcm_playback_silence(snd_pcm_substream_t *substream, snd_pcm_uframes_t new_hw_ptr);
 939 void snd_pcm_tick_prepare(snd_pcm_substream_t *substream);
 940 void snd_pcm_tick_set(snd_pcm_substream_t *substream, unsigned long ticks);
 941 void snd_pcm_tick_elapsed(snd_pcm_substream_t *substream);
 942 void snd_pcm_period_elapsed(snd_pcm_substream_t *substream);
 943 snd_pcm_sframes_t snd_pcm_lib_write(snd_pcm_substream_t *substream,
 944                                     const void __user *buf,
 945                                     snd_pcm_uframes_t frames);
 946 snd_pcm_sframes_t snd_pcm_lib_read(snd_pcm_substream_t *substream,
 947                                    void __user *buf, snd_pcm_uframes_t frames);
 948 snd_pcm_sframes_t snd_pcm_lib_writev(snd_pcm_substream_t *substream,
 949                                      void __user **bufs, snd_pcm_uframes_t frames);
 950 snd_pcm_sframes_t snd_pcm_lib_readv(snd_pcm_substream_t *substream,
 951                                     void __user **bufs, snd_pcm_uframes_t frames);
 952
 953 int snd_pcm_limit_hw_rates(snd_pcm_runtime_t *runtime);
 954
 955 static inline void snd_pcm_set_runtime_buffer(snd_pcm_substream_t *substream,
 956                                               struct snd_dma_buffer *bufp)
 957 {
 958         snd_pcm_runtime_t *runtime = substream->runtime;
 959         if (bufp) {
 960                 runtime->dma_buffer_p = bufp;
 961                 runtime->dma_area = bufp->area;
 962                 runtime->dma_addr = bufp->addr;
 963                 runtime->dma_bytes = bufp->bytes;
 964         } else {
 965                 runtime->dma_buffer_p = NULL;
 966                 runtime->dma_area = NULL;
 967                 runtime->dma_addr = 0;
 968                 runtime->dma_bytes = 0;
 969         }
 970 }
 971
 972 /*
 973  *  Timer interface
 974  */
 975
 976 void snd_pcm_timer_resolution_change(snd_pcm_substream_t *substream);
 977 void snd_pcm_timer_init(snd_pcm_substream_t * substream);
 978 void snd_pcm_timer_done(snd_pcm_substream_t * substream);
 979
 980 /*
 981  *  Memory
 982  */
 983
 984 int snd_pcm_lib_preallocate_free(snd_pcm_substream_t *substream);
 985 int snd_pcm_lib_preallocate_free_for_all(snd_pcm_t *pcm);
 986 int snd_pcm_lib_preallocate_pages(snd_pcm_substream_t *substream,
 987                                   int type, struct device *data,
 988                                   size_t size, size_t max);
 989 int snd_pcm_lib_preallocate_pages_for_all(snd_pcm_t *pcm,
 990                                           int type, void *data,
 991                                           size_t size, size_t max);
 992 int snd_pcm_lib_malloc_pages(snd_pcm_substream_t *substream, size_t size);
 993 int snd_pcm_lib_free_pages(snd_pcm_substream_t *substream);
 994
 995 #define snd_pcm_substream_sgbuf(substream) ((substream)->runtime->dma_buffer_p->private_data)
 996 #define snd_pcm_sgbuf_pages(size) snd_sgbuf_aligned_pages(size)
 997 #define snd_pcm_sgbuf_get_addr(sgbuf,ofs) snd_sgbuf_get_addr(sgbuf,ofs)
 998 struct page *snd_pcm_sgbuf_ops_page(snd_pcm_substream_t *substream, unsigned long offset);
 999
1000 /* handle mmap counter - PCM mmap callback should handle this counter properly */
1001 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
1002 {
1003         snd_pcm_substream_t *substream = (snd_pcm_substream_t *)area->vm_private_data;
1004         atomic_inc(&substream->runtime->mmap_count);
1005 }
1006
1007 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
1008 {
1009         snd_pcm_substream_t *substream = (snd_pcm_substream_t *)area->vm_private_data;
1010         atomic_dec(&substream->runtime->mmap_count);
1011 }
1012
1013 /* mmap for io-memory area */
1014 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
1015 #define SNDRV_PCM_INFO_MMAP_IOMEM       SNDRV_PCM_INFO_MMAP
1016 int snd_pcm_lib_mmap_iomem(snd_pcm_substream_t *substream, struct vm_area_struct *area);
1017 #else
1018 #define SNDRV_PCM_INFO_MMAP_IOMEM       0
1019 #define snd_pcm_lib_mmap_iomem  NULL
1020 #endif
1021
1022 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
1023 {
1024         *max = dma < 4 ? 64 * 1024 : 128 * 1024;
1025 }
1026
1027 /*
1028  *  Misc
1029  */
1030
1031 #define SNDRV_PCM_DEFAULT_CON_SPDIF     (IEC958_AES0_CON_EMPHASIS_NONE|\
1032                                          (IEC958_AES1_CON_ORIGINAL<<8)|\
1033                                          (IEC958_AES1_CON_PCM_CODER<<8)|\
1034                                          (IEC958_AES3_CON_FS_48000<<24))
1035
1036 #endif /* __SOUND_PCM_H */