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