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@perex.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 <sound/minors.h>
  29 #include <linux/poll.h>
  30 #include <linux/mm.h>
  31 #include <linux/bitops.h>
  32 #include <linux/pm_qos.h>
  33
  34 #define snd_pcm_substream_chip(substream) ((substream)->private_data)
  35 #define snd_pcm_chip(pcm) ((pcm)->private_data)
  36
  37 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
  38 #include <sound/pcm_oss.h>
  39 #endif
  40
  41 /*
  42  *  Hardware (lowlevel) section
  43  */
  44
  45 struct snd_pcm_hardware {
  46         unsigned int info;              /* SNDRV_PCM_INFO_* */
  47         u64 formats;                    /* SNDRV_PCM_FMTBIT_* */
  48         unsigned int rates;             /* SNDRV_PCM_RATE_* */
  49         unsigned int rate_min;          /* min rate */
  50         unsigned int rate_max;          /* max rate */
  51         unsigned int channels_min;      /* min channels */
  52         unsigned int channels_max;      /* max channels */
  53         size_t buffer_bytes_max;        /* max buffer size */
  54         size_t period_bytes_min;        /* min period size */
  55         size_t period_bytes_max;        /* max period size */
  56         unsigned int periods_min;       /* min # of periods */
  57         unsigned int periods_max;       /* max # of periods */
  58         size_t fifo_size;               /* fifo size in bytes */
  59 };
  60
  61 struct snd_pcm_substream;
  62
  63 struct snd_pcm_audio_tstamp_config; /* definitions further down */
  64 struct snd_pcm_audio_tstamp_report;
  65
  66 struct snd_pcm_ops {
  67         int (*open)(struct snd_pcm_substream *substream);
  68         int (*close)(struct snd_pcm_substream *substream);
  69         int (*ioctl)(struct snd_pcm_substream * substream,
  70                      unsigned int cmd, void *arg);
  71         int (*hw_params)(struct snd_pcm_substream *substream,
  72                          struct snd_pcm_hw_params *params);
  73         int (*hw_free)(struct snd_pcm_substream *substream);
  74         int (*prepare)(struct snd_pcm_substream *substream);
  75         int (*trigger)(struct snd_pcm_substream *substream, int cmd);
  76         snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *substream);
  77         int (*get_time_info)(struct snd_pcm_substream *substream,
  78                         struct timespec *system_ts, struct timespec *audio_ts,
  79                         struct snd_pcm_audio_tstamp_config *audio_tstamp_config,
  80                         struct snd_pcm_audio_tstamp_report *audio_tstamp_report);
  81         int (*copy)(struct snd_pcm_substream *substream, int channel,
  82                     snd_pcm_uframes_t pos,
  83                     void __user *buf, snd_pcm_uframes_t count);
  84         int (*silence)(struct snd_pcm_substream *substream, int channel,
  85                        snd_pcm_uframes_t pos, snd_pcm_uframes_t count);
  86         struct page *(*page)(struct snd_pcm_substream *substream,
  87                              unsigned long offset);
  88         int (*mmap)(struct snd_pcm_substream *substream, struct vm_area_struct *vma);
  89         int (*ack)(struct snd_pcm_substream *substream);
  90 };
  91
  92 /*
  93  *
  94  */
  95
  96 #if defined(CONFIG_SND_DYNAMIC_MINORS)
  97 #define SNDRV_PCM_DEVICES       (SNDRV_OS_MINORS-2)
  98 #else
  99 #define SNDRV_PCM_DEVICES       8
 100 #endif
 101
 102 #define SNDRV_PCM_IOCTL1_RESET          0
 103 #define SNDRV_PCM_IOCTL1_INFO           1
 104 #define SNDRV_PCM_IOCTL1_CHANNEL_INFO   2
 105 #define SNDRV_PCM_IOCTL1_GSTATE         3
 106 #define SNDRV_PCM_IOCTL1_FIFO_SIZE      4
 107
 108 #define SNDRV_PCM_TRIGGER_STOP          0
 109 #define SNDRV_PCM_TRIGGER_START         1
 110 #define SNDRV_PCM_TRIGGER_PAUSE_PUSH    3
 111 #define SNDRV_PCM_TRIGGER_PAUSE_RELEASE 4
 112 #define SNDRV_PCM_TRIGGER_SUSPEND       5
 113 #define SNDRV_PCM_TRIGGER_RESUME        6
 114 #define SNDRV_PCM_TRIGGER_DRAIN         7
 115
 116 #define SNDRV_PCM_POS_XRUN              ((snd_pcm_uframes_t)-1)
 117
 118 /* If you change this don't forget to change rates[] table in pcm_native.c */
 119 #define SNDRV_PCM_RATE_5512             (1<<0)          /* 5512Hz */
 120 #define SNDRV_PCM_RATE_8000             (1<<1)          /* 8000Hz */
 121 #define SNDRV_PCM_RATE_11025            (1<<2)          /* 11025Hz */
 122 #define SNDRV_PCM_RATE_16000            (1<<3)          /* 16000Hz */
 123 #define SNDRV_PCM_RATE_22050            (1<<4)          /* 22050Hz */
 124 #define SNDRV_PCM_RATE_32000            (1<<5)          /* 32000Hz */
 125 #define SNDRV_PCM_RATE_44100            (1<<6)          /* 44100Hz */
 126 #define SNDRV_PCM_RATE_48000            (1<<7)          /* 48000Hz */
 127 #define SNDRV_PCM_RATE_64000            (1<<8)          /* 64000Hz */
 128 #define SNDRV_PCM_RATE_88200            (1<<9)          /* 88200Hz */
 129 #define SNDRV_PCM_RATE_96000            (1<<10)         /* 96000Hz */
 130 #define SNDRV_PCM_RATE_176400           (1<<11)         /* 176400Hz */
 131 #define SNDRV_PCM_RATE_192000           (1<<12)         /* 192000Hz */
 132
 133 #define SNDRV_PCM_RATE_CONTINUOUS       (1<<30)         /* continuous range */
 134 #define SNDRV_PCM_RATE_KNOT             (1<<31)         /* supports more non-continuos rates */
 135
 136 #define SNDRV_PCM_RATE_8000_44100       (SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_11025|\
 137                                          SNDRV_PCM_RATE_16000|SNDRV_PCM_RATE_22050|\
 138                                          SNDRV_PCM_RATE_32000|SNDRV_PCM_RATE_44100)
 139 #define SNDRV_PCM_RATE_8000_48000       (SNDRV_PCM_RATE_8000_44100|SNDRV_PCM_RATE_48000)
 140 #define SNDRV_PCM_RATE_8000_96000       (SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_64000|\
 141                                          SNDRV_PCM_RATE_88200|SNDRV_PCM_RATE_96000)
 142 #define SNDRV_PCM_RATE_8000_192000      (SNDRV_PCM_RATE_8000_96000|SNDRV_PCM_RATE_176400|\
 143                                          SNDRV_PCM_RATE_192000)
 144 #define _SNDRV_PCM_FMTBIT(fmt)          (1ULL << (__force int)SNDRV_PCM_FORMAT_##fmt)
 145 #define SNDRV_PCM_FMTBIT_S8             _SNDRV_PCM_FMTBIT(S8)
 146 #define SNDRV_PCM_FMTBIT_U8             _SNDRV_PCM_FMTBIT(U8)
 147 #define SNDRV_PCM_FMTBIT_S16_LE         _SNDRV_PCM_FMTBIT(S16_LE)
 148 #define SNDRV_PCM_FMTBIT_S16_BE         _SNDRV_PCM_FMTBIT(S16_BE)
 149 #define SNDRV_PCM_FMTBIT_U16_LE         _SNDRV_PCM_FMTBIT(U16_LE)
 150 #define SNDRV_PCM_FMTBIT_U16_BE         _SNDRV_PCM_FMTBIT(U16_BE)
 151 #define SNDRV_PCM_FMTBIT_S24_LE         _SNDRV_PCM_FMTBIT(S24_LE)
 152 #define SNDRV_PCM_FMTBIT_S24_BE         _SNDRV_PCM_FMTBIT(S24_BE)
 153 #define SNDRV_PCM_FMTBIT_U24_LE         _SNDRV_PCM_FMTBIT(U24_LE)
 154 #define SNDRV_PCM_FMTBIT_U24_BE         _SNDRV_PCM_FMTBIT(U24_BE)
 155 #define SNDRV_PCM_FMTBIT_S32_LE         _SNDRV_PCM_FMTBIT(S32_LE)
 156 #define SNDRV_PCM_FMTBIT_S32_BE         _SNDRV_PCM_FMTBIT(S32_BE)
 157 #define SNDRV_PCM_FMTBIT_U32_LE         _SNDRV_PCM_FMTBIT(U32_LE)
 158 #define SNDRV_PCM_FMTBIT_U32_BE         _SNDRV_PCM_FMTBIT(U32_BE)
 159 #define SNDRV_PCM_FMTBIT_FLOAT_LE       _SNDRV_PCM_FMTBIT(FLOAT_LE)
 160 #define SNDRV_PCM_FMTBIT_FLOAT_BE       _SNDRV_PCM_FMTBIT(FLOAT_BE)
 161 #define SNDRV_PCM_FMTBIT_FLOAT64_LE     _SNDRV_PCM_FMTBIT(FLOAT64_LE)
 162 #define SNDRV_PCM_FMTBIT_FLOAT64_BE     _SNDRV_PCM_FMTBIT(FLOAT64_BE)
 163 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_LE)
 164 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_BE)
 165 #define SNDRV_PCM_FMTBIT_MU_LAW         _SNDRV_PCM_FMTBIT(MU_LAW)
 166 #define SNDRV_PCM_FMTBIT_A_LAW          _SNDRV_PCM_FMTBIT(A_LAW)
 167 #define SNDRV_PCM_FMTBIT_IMA_ADPCM      _SNDRV_PCM_FMTBIT(IMA_ADPCM)
 168 #define SNDRV_PCM_FMTBIT_MPEG           _SNDRV_PCM_FMTBIT(MPEG)
 169 #define SNDRV_PCM_FMTBIT_GSM            _SNDRV_PCM_FMTBIT(GSM)
 170 #define SNDRV_PCM_FMTBIT_SPECIAL        _SNDRV_PCM_FMTBIT(SPECIAL)
 171 #define SNDRV_PCM_FMTBIT_S24_3LE        _SNDRV_PCM_FMTBIT(S24_3LE)
 172 #define SNDRV_PCM_FMTBIT_U24_3LE        _SNDRV_PCM_FMTBIT(U24_3LE)
 173 #define SNDRV_PCM_FMTBIT_S24_3BE        _SNDRV_PCM_FMTBIT(S24_3BE)
 174 #define SNDRV_PCM_FMTBIT_U24_3BE        _SNDRV_PCM_FMTBIT(U24_3BE)
 175 #define SNDRV_PCM_FMTBIT_S20_3LE        _SNDRV_PCM_FMTBIT(S20_3LE)
 176 #define SNDRV_PCM_FMTBIT_U20_3LE        _SNDRV_PCM_FMTBIT(U20_3LE)
 177 #define SNDRV_PCM_FMTBIT_S20_3BE        _SNDRV_PCM_FMTBIT(S20_3BE)
 178 #define SNDRV_PCM_FMTBIT_U20_3BE        _SNDRV_PCM_FMTBIT(U20_3BE)
 179 #define SNDRV_PCM_FMTBIT_S18_3LE        _SNDRV_PCM_FMTBIT(S18_3LE)
 180 #define SNDRV_PCM_FMTBIT_U18_3LE        _SNDRV_PCM_FMTBIT(U18_3LE)
 181 #define SNDRV_PCM_FMTBIT_S18_3BE        _SNDRV_PCM_FMTBIT(S18_3BE)
 182 #define SNDRV_PCM_FMTBIT_U18_3BE        _SNDRV_PCM_FMTBIT(U18_3BE)
 183 #define SNDRV_PCM_FMTBIT_G723_24        _SNDRV_PCM_FMTBIT(G723_24)
 184 #define SNDRV_PCM_FMTBIT_G723_24_1B     _SNDRV_PCM_FMTBIT(G723_24_1B)
 185 #define SNDRV_PCM_FMTBIT_G723_40        _SNDRV_PCM_FMTBIT(G723_40)
 186 #define SNDRV_PCM_FMTBIT_G723_40_1B     _SNDRV_PCM_FMTBIT(G723_40_1B)
 187 #define SNDRV_PCM_FMTBIT_DSD_U8         _SNDRV_PCM_FMTBIT(DSD_U8)
 188 #define SNDRV_PCM_FMTBIT_DSD_U16_LE     _SNDRV_PCM_FMTBIT(DSD_U16_LE)
 189 #define SNDRV_PCM_FMTBIT_DSD_U32_LE     _SNDRV_PCM_FMTBIT(DSD_U32_LE)
 190 #define SNDRV_PCM_FMTBIT_DSD_U16_BE     _SNDRV_PCM_FMTBIT(DSD_U16_BE)
 191 #define SNDRV_PCM_FMTBIT_DSD_U32_BE     _SNDRV_PCM_FMTBIT(DSD_U32_BE)
 192
 193 #ifdef SNDRV_LITTLE_ENDIAN
 194 #define SNDRV_PCM_FMTBIT_S16            SNDRV_PCM_FMTBIT_S16_LE
 195 #define SNDRV_PCM_FMTBIT_U16            SNDRV_PCM_FMTBIT_U16_LE
 196 #define SNDRV_PCM_FMTBIT_S24            SNDRV_PCM_FMTBIT_S24_LE
 197 #define SNDRV_PCM_FMTBIT_U24            SNDRV_PCM_FMTBIT_U24_LE
 198 #define SNDRV_PCM_FMTBIT_S32            SNDRV_PCM_FMTBIT_S32_LE
 199 #define SNDRV_PCM_FMTBIT_U32            SNDRV_PCM_FMTBIT_U32_LE
 200 #define SNDRV_PCM_FMTBIT_FLOAT          SNDRV_PCM_FMTBIT_FLOAT_LE
 201 #define SNDRV_PCM_FMTBIT_FLOAT64        SNDRV_PCM_FMTBIT_FLOAT64_LE
 202 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE
 203 #endif
 204 #ifdef SNDRV_BIG_ENDIAN
 205 #define SNDRV_PCM_FMTBIT_S16            SNDRV_PCM_FMTBIT_S16_BE
 206 #define SNDRV_PCM_FMTBIT_U16            SNDRV_PCM_FMTBIT_U16_BE
 207 #define SNDRV_PCM_FMTBIT_S24            SNDRV_PCM_FMTBIT_S24_BE
 208 #define SNDRV_PCM_FMTBIT_U24            SNDRV_PCM_FMTBIT_U24_BE
 209 #define SNDRV_PCM_FMTBIT_S32            SNDRV_PCM_FMTBIT_S32_BE
 210 #define SNDRV_PCM_FMTBIT_U32            SNDRV_PCM_FMTBIT_U32_BE
 211 #define SNDRV_PCM_FMTBIT_FLOAT          SNDRV_PCM_FMTBIT_FLOAT_BE
 212 #define SNDRV_PCM_FMTBIT_FLOAT64        SNDRV_PCM_FMTBIT_FLOAT64_BE
 213 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE
 214 #endif
 215
 216 struct snd_pcm_file {
 217         struct snd_pcm_substream *substream;
 218         int no_compat_mmap;
 219 };
 220
 221 struct snd_pcm_hw_rule;
 222 typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params,
 223                                       struct snd_pcm_hw_rule *rule);
 224
 225 struct snd_pcm_hw_rule {
 226         unsigned int cond;
 227         int var;
 228         int deps[4];
 229
 230         snd_pcm_hw_rule_func_t func;
 231         void *private;
 232 };
 233
 234 struct snd_pcm_hw_constraints {
 235         struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK -
 236                          SNDRV_PCM_HW_PARAM_FIRST_MASK + 1];
 237         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL -
 238                              SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
 239         unsigned int rules_num;
 240         unsigned int rules_all;
 241         struct snd_pcm_hw_rule *rules;
 242 };
 243
 244 static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs,
 245                                             snd_pcm_hw_param_t var)
 246 {
 247         return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 248 }
 249
 250 static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs,
 251                                                     snd_pcm_hw_param_t var)
 252 {
 253         return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 254 }
 255
 256 struct snd_ratnum {
 257         unsigned int num;
 258         unsigned int den_min, den_max, den_step;
 259 };
 260
 261 struct snd_ratden {
 262         unsigned int num_min, num_max, num_step;
 263         unsigned int den;
 264 };
 265
 266 struct snd_pcm_hw_constraint_ratnums {
 267         int nrats;
 268         const struct snd_ratnum *rats;
 269 };
 270
 271 struct snd_pcm_hw_constraint_ratdens {
 272         int nrats;
 273         const struct snd_ratden *rats;
 274 };
 275
 276 struct snd_pcm_hw_constraint_list {
 277         const unsigned int *list;
 278         unsigned int count;
 279         unsigned int mask;
 280 };
 281
 282 struct snd_pcm_hw_constraint_ranges {
 283         unsigned int count;
 284         const struct snd_interval *ranges;
 285         unsigned int mask;
 286 };
 287
 288 /*
 289  * userspace-provided audio timestamp config to kernel,
 290  * structure is for internal use only and filled with dedicated unpack routine
 291  */
 292 struct snd_pcm_audio_tstamp_config {
 293         /* 5 of max 16 bits used */
 294         u32 type_requested:4;
 295         u32 report_delay:1; /* add total delay to A/D or D/A */
 296 };
 297
 298 static inline void snd_pcm_unpack_audio_tstamp_config(__u32 data,
 299                                                 struct snd_pcm_audio_tstamp_config *config)
 300 {
 301         config->type_requested = data & 0xF;
 302         config->report_delay = (data >> 4) & 1;
 303 }
 304
 305 /*
 306  * kernel-provided audio timestamp report to user-space
 307  * structure is for internal use only and read by dedicated pack routine
 308  */
 309 struct snd_pcm_audio_tstamp_report {
 310         /* 6 of max 16 bits used for bit-fields */
 311
 312         /* for backwards compatibility */
 313         u32 valid:1;
 314
 315         /* actual type if hardware could not support requested timestamp */
 316         u32 actual_type:4;
 317
 318         /* accuracy represented in ns units */
 319         u32 accuracy_report:1; /* 0 if accuracy unknown, 1 if accuracy field is valid */
 320         u32 accuracy; /* up to 4.29s, will be packed in separate field  */
 321 };
 322
 323 static inline void snd_pcm_pack_audio_tstamp_report(__u32 *data, __u32 *accuracy,
 324                                                 const struct snd_pcm_audio_tstamp_report *report)
 325 {
 326         u32 tmp;
 327
 328         tmp = report->accuracy_report;
 329         tmp <<= 4;
 330         tmp |= report->actual_type;
 331         tmp <<= 1;
 332         tmp |= report->valid;
 333
 334         *data &= 0xffff; /* zero-clear MSBs */
 335         *data |= (tmp << 16);
 336         *accuracy = report->accuracy;
 337 }
 338
 339
 340 struct snd_pcm_runtime {
 341         /* -- Status -- */
 342         struct snd_pcm_substream *trigger_master;
 343         struct timespec trigger_tstamp; /* trigger timestamp */
 344         bool trigger_tstamp_latched;     /* trigger timestamp latched in low-level driver/hardware */
 345         int overrange;
 346         snd_pcm_uframes_t avail_max;
 347         snd_pcm_uframes_t hw_ptr_base;  /* Position at buffer restart */
 348         snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time */
 349         unsigned long hw_ptr_jiffies;   /* Time when hw_ptr is updated */
 350         unsigned long hw_ptr_buffer_jiffies; /* buffer time in jiffies */
 351         snd_pcm_sframes_t delay;        /* extra delay; typically FIFO size */
 352         u64 hw_ptr_wrap;                /* offset for hw_ptr due to boundary wrap-around */
 353
 354         /* -- HW params -- */
 355         snd_pcm_access_t access;        /* access mode */
 356         snd_pcm_format_t format;        /* SNDRV_PCM_FORMAT_* */
 357         snd_pcm_subformat_t subformat;  /* subformat */
 358         unsigned int rate;              /* rate in Hz */
 359         unsigned int channels;          /* channels */
 360         snd_pcm_uframes_t period_size;  /* period size */
 361         unsigned int periods;           /* periods */
 362         snd_pcm_uframes_t buffer_size;  /* buffer size */
 363         snd_pcm_uframes_t min_align;    /* Min alignment for the format */
 364         size_t byte_align;
 365         unsigned int frame_bits;
 366         unsigned int sample_bits;
 367         unsigned int info;
 368         unsigned int rate_num;
 369         unsigned int rate_den;
 370         unsigned int no_period_wakeup: 1;
 371
 372         /* -- SW params -- */
 373         int tstamp_mode;                /* mmap timestamp is updated */
 374         unsigned int period_step;
 375         snd_pcm_uframes_t start_threshold;
 376         snd_pcm_uframes_t stop_threshold;
 377         snd_pcm_uframes_t silence_threshold; /* Silence filling happens when
 378                                                 noise is nearest than this */
 379         snd_pcm_uframes_t silence_size; /* Silence filling size */
 380         snd_pcm_uframes_t boundary;     /* pointers wrap point */
 381
 382         snd_pcm_uframes_t silence_start; /* starting pointer to silence area */
 383         snd_pcm_uframes_t silence_filled; /* size filled with silence */
 384
 385         union snd_pcm_sync_id sync;     /* hardware synchronization ID */
 386
 387         /* -- mmap -- */
 388         struct snd_pcm_mmap_status *status;
 389         struct snd_pcm_mmap_control *control;
 390
 391         /* -- locking / scheduling -- */
 392         snd_pcm_uframes_t twake;        /* do transfer (!poll) wakeup if non-zero */
 393         wait_queue_head_t sleep;        /* poll sleep */
 394         wait_queue_head_t tsleep;       /* transfer sleep */
 395         struct fasync_struct *fasync;
 396
 397         /* -- private section -- */
 398         void *private_data;
 399         void (*private_free)(struct snd_pcm_runtime *runtime);
 400
 401         /* -- hardware description -- */
 402         struct snd_pcm_hardware hw;
 403         struct snd_pcm_hw_constraints hw_constraints;
 404
 405         /* -- timer -- */
 406         unsigned int timer_resolution;  /* timer resolution */
 407         int tstamp_type;                /* timestamp type */
 408
 409         /* -- DMA -- */
 410         unsigned char *dma_area;        /* DMA area */
 411         dma_addr_t dma_addr;            /* physical bus address (not accessible from main CPU) */
 412         size_t dma_bytes;               /* size of DMA area */
 413
 414         struct snd_dma_buffer *dma_buffer_p;    /* allocated buffer */
 415
 416         /* -- audio timestamp config -- */
 417         struct snd_pcm_audio_tstamp_config audio_tstamp_config;
 418         struct snd_pcm_audio_tstamp_report audio_tstamp_report;
 419         struct timespec driver_tstamp;
 420
 421 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 422         /* -- OSS things -- */
 423         struct snd_pcm_oss_runtime oss;
 424 #endif
 425 };
 426
 427 struct snd_pcm_group {          /* keep linked substreams */
 428         spinlock_t lock;
 429         struct mutex mutex;
 430         struct list_head substreams;
 431         int count;
 432 };
 433
 434 struct pid;
 435
 436 struct snd_pcm_substream {
 437         struct snd_pcm *pcm;
 438         struct snd_pcm_str *pstr;
 439         void *private_data;             /* copied from pcm->private_data */
 440         int number;
 441         char name[32];                  /* substream name */
 442         int stream;                     /* stream (direction) */
 443         struct pm_qos_request latency_pm_qos_req; /* pm_qos request */
 444         size_t buffer_bytes_max;        /* limit ring buffer size */
 445         struct snd_dma_buffer dma_buffer;
 446         size_t dma_max;
 447         /* -- hardware operations -- */
 448         const struct snd_pcm_ops *ops;
 449         /* -- runtime information -- */
 450         struct snd_pcm_runtime *runtime;
 451         /* -- timer section -- */
 452         struct snd_timer *timer;                /* timer */
 453         unsigned timer_running: 1;      /* time is running */
 454         /* -- next substream -- */
 455         struct snd_pcm_substream *next;
 456         /* -- linked substreams -- */
 457         struct list_head link_list;     /* linked list member */
 458         struct snd_pcm_group self_group;        /* fake group for non linked substream (with substream lock inside) */
 459         struct snd_pcm_group *group;            /* pointer to current group */
 460         /* -- assigned files -- */
 461         void *file;
 462         int ref_count;
 463         atomic_t mmap_count;
 464         unsigned int f_flags;
 465         void (*pcm_release)(struct snd_pcm_substream *);
 466         struct pid *pid;
 467 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 468         /* -- OSS things -- */
 469         struct snd_pcm_oss_substream oss;
 470 #endif
 471 #ifdef CONFIG_SND_VERBOSE_PROCFS
 472         struct snd_info_entry *proc_root;
 473         struct snd_info_entry *proc_info_entry;
 474         struct snd_info_entry *proc_hw_params_entry;
 475         struct snd_info_entry *proc_sw_params_entry;
 476         struct snd_info_entry *proc_status_entry;
 477         struct snd_info_entry *proc_prealloc_entry;
 478         struct snd_info_entry *proc_prealloc_max_entry;
 479 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 480         struct snd_info_entry *proc_xrun_injection_entry;
 481 #endif
 482 #endif /* CONFIG_SND_VERBOSE_PROCFS */
 483         /* misc flags */
 484         unsigned int hw_opened: 1;
 485 };
 486
 487 #define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0)
 488
 489
 490 struct snd_pcm_str {
 491         int stream;                             /* stream (direction) */
 492         struct snd_pcm *pcm;
 493         /* -- substreams -- */
 494         unsigned int substream_count;
 495         unsigned int substream_opened;
 496         struct snd_pcm_substream *substream;
 497 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 498         /* -- OSS things -- */
 499         struct snd_pcm_oss_stream oss;
 500 #endif
 501 #ifdef CONFIG_SND_VERBOSE_PROCFS
 502         struct snd_info_entry *proc_root;
 503         struct snd_info_entry *proc_info_entry;
 504 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 505         unsigned int xrun_debug;        /* 0 = disabled, 1 = verbose, 2 = stacktrace */
 506         struct snd_info_entry *proc_xrun_debug_entry;
 507 #endif
 508 #endif
 509         struct snd_kcontrol *chmap_kctl; /* channel-mapping controls */
 510         struct device dev;
 511 };
 512
 513 struct snd_pcm {
 514         struct snd_card *card;
 515         struct list_head list;
 516         int device; /* device number */
 517         unsigned int info_flags;
 518         unsigned short dev_class;
 519         unsigned short dev_subclass;
 520         char id[64];
 521         char name[80];
 522         struct snd_pcm_str streams[2];
 523         struct mutex open_mutex;
 524         wait_queue_head_t open_wait;
 525         void *private_data;
 526         void (*private_free) (struct snd_pcm *pcm);
 527         bool internal; /* pcm is for internal use only */
 528         bool nonatomic; /* whole PCM operations are in non-atomic context */
 529 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
 530         struct snd_pcm_oss oss;
 531 #endif
 532 };
 533
 534 struct snd_pcm_notify {
 535         int (*n_register) (struct snd_pcm * pcm);
 536         int (*n_disconnect) (struct snd_pcm * pcm);
 537         int (*n_unregister) (struct snd_pcm * pcm);
 538         struct list_head list;
 539 };
 540
 541 /*
 542  *  Registering
 543  */
 544
 545 extern const struct file_operations snd_pcm_f_ops[2];
 546
 547 int snd_pcm_new(struct snd_card *card, const char *id, int device,
 548                 int playback_count, int capture_count,
 549                 struct snd_pcm **rpcm);
 550 int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
 551                 int playback_count, int capture_count,
 552                 struct snd_pcm **rpcm);
 553 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
 554
 555 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
 556
 557 /*
 558  *  Native I/O
 559  */
 560
 561 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
 562 int snd_pcm_info_user(struct snd_pcm_substream *substream,
 563                       struct snd_pcm_info __user *info);
 564 int snd_pcm_status(struct snd_pcm_substream *substream,
 565                    struct snd_pcm_status *status);
 566 int snd_pcm_start(struct snd_pcm_substream *substream);
 567 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t status);
 568 int snd_pcm_drain_done(struct snd_pcm_substream *substream);
 569 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream);
 570 #ifdef CONFIG_PM
 571 int snd_pcm_suspend(struct snd_pcm_substream *substream);
 572 int snd_pcm_suspend_all(struct snd_pcm *pcm);
 573 #endif
 574 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
 575 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
 576                            struct snd_pcm_substream **rsubstream);
 577 void snd_pcm_release_substream(struct snd_pcm_substream *substream);
 578 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
 579                              struct snd_pcm_substream **rsubstream);
 580 void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
 581 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
 582
 583
 584 #ifdef CONFIG_SND_DEBUG
 585 void snd_pcm_debug_name(struct snd_pcm_substream *substream,
 586                            char *name, size_t len);
 587 #else
 588 static inline void
 589 snd_pcm_debug_name(struct snd_pcm_substream *substream, char *buf, size_t size)
 590 {
 591         *buf = 0;
 592 }
 593 #endif
 594
 595 /*
 596  *  PCM library
 597  */
 598
 599 /**
 600  * snd_pcm_stream_linked - Check whether the substream is linked with others
 601  * @substream: substream to check
 602  *
 603  * Returns true if the given substream is being linked with others.
 604  */
 605 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
 606 {
 607         return substream->group != &substream->self_group;
 608 }
 609
 610 void snd_pcm_stream_lock(struct snd_pcm_substream *substream);
 611 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream);
 612 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream);
 613 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream);
 614 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream);
 615
 616 /**
 617  * snd_pcm_stream_lock_irqsave - Lock the PCM stream
 618  * @substream: PCM substream
 619  * @flags: irq flags
 620  *
 621  * This locks the PCM stream like snd_pcm_stream_lock() but with the local
 622  * IRQ (only when nonatomic is false).  In nonatomic case, this is identical
 623  * as snd_pcm_stream_lock().
 624  */
 625 #define snd_pcm_stream_lock_irqsave(substream, flags)            \
 626         do {                                                     \
 627                 typecheck(unsigned long, flags);                 \
 628                 flags = _snd_pcm_stream_lock_irqsave(substream); \
 629         } while (0)
 630 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
 631                                       unsigned long flags);
 632
 633 /**
 634  * snd_pcm_group_for_each_entry - iterate over the linked substreams
 635  * @s: the iterator
 636  * @substream: the substream
 637  *
 638  * Iterate over the all linked substreams to the given @substream.
 639  * When @substream isn't linked with any others, this gives returns @substream
 640  * itself once.
 641  */
 642 #define snd_pcm_group_for_each_entry(s, substream) \
 643         list_for_each_entry(s, &substream->group->substreams, link_list)
 644
 645 /**
 646  * snd_pcm_running - Check whether the substream is in a running state
 647  * @substream: substream to check
 648  *
 649  * Returns true if the given substream is in the state RUNNING, or in the
 650  * state DRAINING for playback.
 651  */
 652 static inline int snd_pcm_running(struct snd_pcm_substream *substream)
 653 {
 654         return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 655                 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
 656                  substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
 657 }
 658
 659 /**
 660  * bytes_to_samples - Unit conversion of the size from bytes to samples
 661  * @runtime: PCM runtime instance
 662  * @size: size in bytes
 663  */
 664 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
 665 {
 666         return size * 8 / runtime->sample_bits;
 667 }
 668
 669 /**
 670  * bytes_to_frames - Unit conversion of the size from bytes to frames
 671  * @runtime: PCM runtime instance
 672  * @size: size in bytes
 673  */
 674 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
 675 {
 676         return size * 8 / runtime->frame_bits;
 677 }
 678
 679 /**
 680  * samples_to_bytes - Unit conversion of the size from samples to bytes
 681  * @runtime: PCM runtime instance
 682  * @size: size in samples
 683  */
 684 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
 685 {
 686         return size * runtime->sample_bits / 8;
 687 }
 688
 689 /**
 690  * frames_to_bytes - Unit conversion of the size from frames to bytes
 691  * @runtime: PCM runtime instance
 692  * @size: size in frames
 693  */
 694 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
 695 {
 696         return size * runtime->frame_bits / 8;
 697 }
 698
 699 /**
 700  * frame_aligned - Check whether the byte size is aligned to frames
 701  * @runtime: PCM runtime instance
 702  * @bytes: size in bytes
 703  */
 704 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
 705 {
 706         return bytes % runtime->byte_align == 0;
 707 }
 708
 709 /**
 710  * snd_pcm_lib_buffer_bytes - Get the buffer size of the current PCM in bytes
 711  * @substream: PCM substream
 712  */
 713 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
 714 {
 715         struct snd_pcm_runtime *runtime = substream->runtime;
 716         return frames_to_bytes(runtime, runtime->buffer_size);
 717 }
 718
 719 /**
 720  * snd_pcm_lib_period_bytes - Get the period size of the current PCM in bytes
 721  * @substream: PCM substream
 722  */
 723 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
 724 {
 725         struct snd_pcm_runtime *runtime = substream->runtime;
 726         return frames_to_bytes(runtime, runtime->period_size);
 727 }
 728
 729 /**
 730  * snd_pcm_playback_avail - Get the available (writable) space for playback
 731  * @runtime: PCM runtime instance
 732  *
 733  * Result is between 0 ... (boundary - 1)
 734  */
 735 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
 736 {
 737         snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
 738         if (avail < 0)
 739                 avail += runtime->boundary;
 740         else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
 741                 avail -= runtime->boundary;
 742         return avail;
 743 }
 744
 745 /**
 746  * snd_pcm_playback_avail - Get the available (readable) space for capture
 747  * @runtime: PCM runtime instance
 748  *
 749  * Result is between 0 ... (boundary - 1)
 750  */
 751 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
 752 {
 753         snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
 754         if (avail < 0)
 755                 avail += runtime->boundary;
 756         return avail;
 757 }
 758
 759 /**
 760  * snd_pcm_playback_hw_avail - Get the queued space for playback
 761  * @runtime: PCM runtime instance
 762  */
 763 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
 764 {
 765         return runtime->buffer_size - snd_pcm_playback_avail(runtime);
 766 }
 767
 768 /**
 769  * snd_pcm_capture_hw_avail - Get the free space for capture
 770  * @runtime: PCM runtime instance
 771  */
 772 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
 773 {
 774         return runtime->buffer_size - snd_pcm_capture_avail(runtime);
 775 }
 776
 777 /**
 778  * snd_pcm_playback_ready - check whether the playback buffer is available
 779  * @substream: the pcm substream instance
 780  *
 781  * Checks whether enough free space is available on the playback buffer.
 782  *
 783  * Return: Non-zero if available, or zero if not.
 784  */
 785 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
 786 {
 787         struct snd_pcm_runtime *runtime = substream->runtime;
 788         return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
 789 }
 790
 791 /**
 792  * snd_pcm_capture_ready - check whether the capture buffer is available
 793  * @substream: the pcm substream instance
 794  *
 795  * Checks whether enough capture data is available on the capture buffer.
 796  *
 797  * Return: Non-zero if available, or zero if not.
 798  */
 799 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
 800 {
 801         struct snd_pcm_runtime *runtime = substream->runtime;
 802         return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
 803 }
 804
 805 /**
 806  * snd_pcm_playback_data - check whether any data exists on the playback buffer
 807  * @substream: the pcm substream instance
 808  *
 809  * Checks whether any data exists on the playback buffer.
 810  *
 811  * Return: Non-zero if any data exists, or zero if not. If stop_threshold
 812  * is bigger or equal to boundary, then this function returns always non-zero.
 813  */
 814 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
 815 {
 816         struct snd_pcm_runtime *runtime = substream->runtime;
 817
 818         if (runtime->stop_threshold >= runtime->boundary)
 819                 return 1;
 820         return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
 821 }
 822
 823 /**
 824  * snd_pcm_playback_empty - check whether the playback buffer is empty
 825  * @substream: the pcm substream instance
 826  *
 827  * Checks whether the playback buffer is empty.
 828  *
 829  * Return: Non-zero if empty, or zero if not.
 830  */
 831 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
 832 {
 833         struct snd_pcm_runtime *runtime = substream->runtime;
 834         return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
 835 }
 836
 837 /**
 838  * snd_pcm_capture_empty - check whether the capture buffer is empty
 839  * @substream: the pcm substream instance
 840  *
 841  * Checks whether the capture buffer is empty.
 842  *
 843  * Return: Non-zero if empty, or zero if not.
 844  */
 845 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
 846 {
 847         struct snd_pcm_runtime *runtime = substream->runtime;
 848         return snd_pcm_capture_avail(runtime) == 0;
 849 }
 850
 851 /**
 852  * snd_pcm_trigger_done - Mark the master substream
 853  * @substream: the pcm substream instance
 854  * @master: the linked master substream
 855  *
 856  * When multiple substreams of the same card are linked and the hardware
 857  * supports the single-shot operation, the driver calls this in the loop
 858  * in snd_pcm_group_for_each_entry() for marking the substream as "done".
 859  * Then most of trigger operations are performed only to the given master
 860  * substream.
 861  *
 862  * The trigger_master mark is cleared at timestamp updates at the end
 863  * of trigger operations.
 864  */
 865 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream,
 866                                         struct snd_pcm_substream *master)
 867 {
 868         substream->runtime->trigger_master = master;
 869 }
 870
 871 static inline int hw_is_mask(int var)
 872 {
 873         return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
 874                 var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
 875 }
 876
 877 static inline int hw_is_interval(int var)
 878 {
 879         return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
 880                 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
 881 }
 882
 883 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
 884                                      snd_pcm_hw_param_t var)
 885 {
 886         return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 887 }
 888
 889 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
 890                                              snd_pcm_hw_param_t var)
 891 {
 892         return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 893 }
 894
 895 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
 896                                              snd_pcm_hw_param_t var)
 897 {
 898         return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 899 }
 900
 901 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
 902                                                      snd_pcm_hw_param_t var)
 903 {
 904         return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 905 }
 906
 907 /**
 908  * params_channels - Get the number of channels from the hw params
 909  * @p: hw params
 910  */
 911 static inline unsigned int params_channels(const struct snd_pcm_hw_params *p)
 912 {
 913         return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_CHANNELS)->min;
 914 }
 915
 916 /**
 917  * params_rate - Get the sample rate from the hw params
 918  * @p: hw params
 919  */
 920 static inline unsigned int params_rate(const struct snd_pcm_hw_params *p)
 921 {
 922         return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_RATE)->min;
 923 }
 924
 925 /**
 926  * params_period_size - Get the period size (in frames) from the hw params
 927  * @p: hw params
 928  */
 929 static inline unsigned int params_period_size(const struct snd_pcm_hw_params *p)
 930 {
 931         return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min;
 932 }
 933
 934 /**
 935  * params_periods - Get the number of periods from the hw params
 936  * @p: hw params
 937  */
 938 static inline unsigned int params_periods(const struct snd_pcm_hw_params *p)
 939 {
 940         return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIODS)->min;
 941 }
 942
 943 /**
 944  * params_buffer_size - Get the buffer size (in frames) from the hw params
 945  * @p: hw params
 946  */
 947 static inline unsigned int params_buffer_size(const struct snd_pcm_hw_params *p)
 948 {
 949         return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min;
 950 }
 951
 952 /**
 953  * params_buffer_bytes - Get the buffer size (in bytes) from the hw params
 954  * @p: hw params
 955  */
 956 static inline unsigned int params_buffer_bytes(const struct snd_pcm_hw_params *p)
 957 {
 958         return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min;
 959 }
 960
 961 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
 962 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
 963 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c);
 964 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
 965                           unsigned int k, struct snd_interval *c);
 966 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
 967                           const struct snd_interval *b, struct snd_interval *c);
 968 int snd_interval_list(struct snd_interval *i, unsigned int count,
 969                       const unsigned int *list, unsigned int mask);
 970 int snd_interval_ranges(struct snd_interval *i, unsigned int count,
 971                         const struct snd_interval *list, unsigned int mask);
 972 int snd_interval_ratnum(struct snd_interval *i,
 973                         unsigned int rats_count, const struct snd_ratnum *rats,
 974                         unsigned int *nump, unsigned int *denp);
 975
 976 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
 977 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
 978 int snd_pcm_hw_params_choose(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
 979
 980 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
 981
 982 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream);
 983 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream);
 984
 985 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 986                                u_int32_t mask);
 987 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 988                                  u_int64_t mask);
 989 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 990                                  unsigned int min, unsigned int max);
 991 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
 992 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
 993                                unsigned int cond,
 994                                snd_pcm_hw_param_t var,
 995                                const struct snd_pcm_hw_constraint_list *l);
 996 int snd_pcm_hw_constraint_ranges(struct snd_pcm_runtime *runtime,
 997                                  unsigned int cond,
 998                                  snd_pcm_hw_param_t var,
 999                                  const struct snd_pcm_hw_constraint_ranges *r);
1000 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
1001                                   unsigned int cond,
1002                                   snd_pcm_hw_param_t var,
1003                                   const struct snd_pcm_hw_constraint_ratnums *r);
1004 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1005                                   unsigned int cond,
1006                                   snd_pcm_hw_param_t var,
1007                                   const struct snd_pcm_hw_constraint_ratdens *r);
1008 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1009                                  unsigned int cond,
1010                                  unsigned int width,
1011                                  unsigned int msbits);
1012 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1013                                unsigned int cond,
1014                                snd_pcm_hw_param_t var,
1015                                unsigned long step);
1016 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1017                                unsigned int cond,
1018                                snd_pcm_hw_param_t var);
1019 int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
1020                                unsigned int base_rate);
1021 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
1022                         unsigned int cond,
1023                         int var,
1024                         snd_pcm_hw_rule_func_t func, void *private,
1025                         int dep, ...);
1026
1027 /**
1028  * snd_pcm_hw_constraint_single() - Constrain parameter to a single value
1029  * @runtime: PCM runtime instance
1030  * @var: The hw_params variable to constrain
1031  * @val: The value to constrain to
1032  *
1033  * Return: Positive if the value is changed, zero if it's not changed, or a
1034  * negative error code.
1035  */
1036 static inline int snd_pcm_hw_constraint_single(
1037         struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1038         unsigned int val)
1039 {
1040         return snd_pcm_hw_constraint_minmax(runtime, var, val, val);
1041 }
1042
1043 int snd_pcm_format_signed(snd_pcm_format_t format);
1044 int snd_pcm_format_unsigned(snd_pcm_format_t format);
1045 int snd_pcm_format_linear(snd_pcm_format_t format);
1046 int snd_pcm_format_little_endian(snd_pcm_format_t format);
1047 int snd_pcm_format_big_endian(snd_pcm_format_t format);
1048 #if 0 /* just for DocBook */
1049 /**
1050  * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
1051  * @format: the format to check
1052  *
1053  * Return: 1 if the given PCM format is CPU-endian, 0 if
1054  * opposite, or a negative error code if endian not specified.
1055  */
1056 int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
1057 #endif /* DocBook */
1058 #ifdef SNDRV_LITTLE_ENDIAN
1059 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
1060 #else
1061 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
1062 #endif
1063 int snd_pcm_format_width(snd_pcm_format_t format);                      /* in bits */
1064 int snd_pcm_format_physical_width(snd_pcm_format_t format);             /* in bits */
1065 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
1066 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
1067 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
1068
1069 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction,
1070                      const struct snd_pcm_ops *ops);
1071 void snd_pcm_set_sync(struct snd_pcm_substream *substream);
1072 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1073                       unsigned int cmd, void *arg);
1074 int snd_pcm_update_state(struct snd_pcm_substream *substream,
1075                          struct snd_pcm_runtime *runtime);
1076 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream);
1077 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr);
1078 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
1079 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream,
1080                                     const void __user *buf,
1081                                     snd_pcm_uframes_t frames);
1082 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream,
1083                                    void __user *buf, snd_pcm_uframes_t frames);
1084 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
1085                                      void __user **bufs, snd_pcm_uframes_t frames);
1086 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
1087                                     void __user **bufs, snd_pcm_uframes_t frames);
1088
1089 extern const struct snd_pcm_hw_constraint_list snd_pcm_known_rates;
1090
1091 int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime);
1092 unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate);
1093 unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit);
1094 unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a,
1095                                          unsigned int rates_b);
1096 unsigned int snd_pcm_rate_range_to_bits(unsigned int rate_min,
1097                                         unsigned int rate_max);
1098
1099 /**
1100  * snd_pcm_set_runtime_buffer - Set the PCM runtime buffer
1101  * @substream: PCM substream to set
1102  * @bufp: the buffer information, NULL to clear
1103  *
1104  * Copy the buffer information to runtime->dma_buffer when @bufp is non-NULL.
1105  * Otherwise it clears the current buffer information.
1106  */
1107 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
1108                                               struct snd_dma_buffer *bufp)
1109 {
1110         struct snd_pcm_runtime *runtime = substream->runtime;
1111         if (bufp) {
1112                 runtime->dma_buffer_p = bufp;
1113                 runtime->dma_area = bufp->area;
1114                 runtime->dma_addr = bufp->addr;
1115                 runtime->dma_bytes = bufp->bytes;
1116         } else {
1117                 runtime->dma_buffer_p = NULL;
1118                 runtime->dma_area = NULL;
1119                 runtime->dma_addr = 0;
1120                 runtime->dma_bytes = 0;
1121         }
1122 }
1123
1124 /*
1125  *  Timer interface
1126  */
1127
1128 #ifdef CONFIG_SND_PCM_TIMER
1129 void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream);
1130 void snd_pcm_timer_init(struct snd_pcm_substream *substream);
1131 void snd_pcm_timer_done(struct snd_pcm_substream *substream);
1132 #else
1133 static inline void
1134 snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream) {}
1135 static inline void snd_pcm_timer_init(struct snd_pcm_substream *substream) {}
1136 static inline void snd_pcm_timer_done(struct snd_pcm_substream *substream) {}
1137 #endif
1138 /**
1139  * snd_pcm_gettime - Fill the timespec depending on the timestamp mode
1140  * @runtime: PCM runtime instance
1141  * @tv: timespec to fill
1142  */
1143 static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime,
1144                                    struct timespec *tv)
1145 {
1146         switch (runtime->tstamp_type) {
1147         case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC:
1148                 ktime_get_ts(tv);
1149                 break;
1150         case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC_RAW:
1151                 getrawmonotonic(tv);
1152                 break;
1153         default:
1154                 getnstimeofday(tv);
1155                 break;
1156         }
1157 }
1158
1159 /*
1160  *  Memory
1161  */
1162
1163 int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
1164 int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
1165 int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
1166                                   int type, struct device *data,
1167                                   size_t size, size_t max);
1168 int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
1169                                           int type, void *data,
1170                                           size_t size, size_t max);
1171 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
1172 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
1173
1174 int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream,
1175                                       size_t size, gfp_t gfp_flags);
1176 int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream);
1177 struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream,
1178                                           unsigned long offset);
1179 /**
1180  * snd_pcm_lib_alloc_vmalloc_buffer - allocate virtual DMA buffer
1181  * @substream: the substream to allocate the buffer to
1182  * @size: the requested buffer size, in bytes
1183  *
1184  * Allocates the PCM substream buffer using vmalloc(), i.e., the memory is
1185  * contiguous in kernel virtual space, but not in physical memory.  Use this
1186  * if the buffer is accessed by kernel code but not by device DMA.
1187  *
1188  * Return: 1 if the buffer was changed, 0 if not changed, or a negative error
1189  * code.
1190  */
1191 static inline int snd_pcm_lib_alloc_vmalloc_buffer
1192                         (struct snd_pcm_substream *substream, size_t size)
1193 {
1194         return _snd_pcm_lib_alloc_vmalloc_buffer(substream, size,
1195                                                  GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
1196 }
1197
1198 /**
1199  * snd_pcm_lib_alloc_vmalloc_32_buffer - allocate 32-bit-addressable buffer
1200  * @substream: the substream to allocate the buffer to
1201  * @size: the requested buffer size, in bytes
1202  *
1203  * This function works like snd_pcm_lib_alloc_vmalloc_buffer(), but uses
1204  * vmalloc_32(), i.e., the pages are allocated from 32-bit-addressable memory.
1205  *
1206  * Return: 1 if the buffer was changed, 0 if not changed, or a negative error
1207  * code.
1208  */
1209 static inline int snd_pcm_lib_alloc_vmalloc_32_buffer
1210                         (struct snd_pcm_substream *substream, size_t size)
1211 {
1212         return _snd_pcm_lib_alloc_vmalloc_buffer(substream, size,
1213                                                  GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1214 }
1215
1216 #define snd_pcm_get_dma_buf(substream) ((substream)->runtime->dma_buffer_p)
1217
1218 #ifdef CONFIG_SND_DMA_SGBUF
1219 /*
1220  * SG-buffer handling
1221  */
1222 #define snd_pcm_substream_sgbuf(substream) \
1223         snd_pcm_get_dma_buf(substream)->private_data
1224
1225 struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream,
1226                                     unsigned long offset);
1227 #else /* !SND_DMA_SGBUF */
1228 /*
1229  * fake using a continuous buffer
1230  */
1231 #define snd_pcm_sgbuf_ops_page  NULL
1232 #endif /* SND_DMA_SGBUF */
1233
1234 /**
1235  * snd_pcm_sgbuf_get_addr - Get the DMA address at the corresponding offset
1236  * @substream: PCM substream
1237  * @ofs: byte offset
1238  */
1239 static inline dma_addr_t
1240 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
1241 {
1242         return snd_sgbuf_get_addr(snd_pcm_get_dma_buf(substream), ofs);
1243 }
1244
1245 /**
1246  * snd_pcm_sgbuf_get_ptr - Get the virtual address at the corresponding offset
1247  * @substream: PCM substream
1248  * @ofs: byte offset
1249  */
1250 static inline void *
1251 snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
1252 {
1253         return snd_sgbuf_get_ptr(snd_pcm_get_dma_buf(substream), ofs);
1254 }
1255
1256 /**
1257  * snd_pcm_sgbuf_chunk_size - Compute the max size that fits within the contig.
1258  * page from the given size
1259  * @substream: PCM substream
1260  * @ofs: byte offset
1261  * @size: byte size to examine
1262  */
1263 static inline unsigned int
1264 snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
1265                              unsigned int ofs, unsigned int size)
1266 {
1267         return snd_sgbuf_get_chunk_size(snd_pcm_get_dma_buf(substream), ofs, size);
1268 }
1269
1270 /**
1271  * snd_pcm_mmap_data_open - increase the mmap counter
1272  * @area: VMA
1273  *
1274  * PCM mmap callback should handle this counter properly
1275  */
1276 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
1277 {
1278         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1279         atomic_inc(&substream->mmap_count);
1280 }
1281
1282 /**
1283  * snd_pcm_mmap_data_close - decrease the mmap counter
1284  * @area: VMA
1285  *
1286  * PCM mmap callback should handle this counter properly
1287  */
1288 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
1289 {
1290         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1291         atomic_dec(&substream->mmap_count);
1292 }
1293
1294 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
1295                              struct vm_area_struct *area);
1296 /* mmap for io-memory area */
1297 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
1298 #define SNDRV_PCM_INFO_MMAP_IOMEM       SNDRV_PCM_INFO_MMAP
1299 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
1300 #else
1301 #define SNDRV_PCM_INFO_MMAP_IOMEM       0
1302 #define snd_pcm_lib_mmap_iomem  NULL
1303 #endif
1304
1305 #define snd_pcm_lib_mmap_vmalloc NULL
1306
1307 /**
1308  * snd_pcm_limit_isa_dma_size - Get the max size fitting with ISA DMA transfer
1309  * @dma: DMA number
1310  * @max: pointer to store the max size
1311  */
1312 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
1313 {
1314         *max = dma < 4 ? 64 * 1024 : 128 * 1024;
1315 }
1316
1317 /*
1318  *  Misc
1319  */
1320
1321 #define SNDRV_PCM_DEFAULT_CON_SPDIF     (IEC958_AES0_CON_EMPHASIS_NONE|\
1322                                          (IEC958_AES1_CON_ORIGINAL<<8)|\
1323                                          (IEC958_AES1_CON_PCM_CODER<<8)|\
1324                                          (IEC958_AES3_CON_FS_48000<<24))
1325
1326 #define PCM_RUNTIME_CHECK(sub) snd_BUG_ON(!(sub) || !(sub)->runtime)
1327
1328 const char *snd_pcm_format_name(snd_pcm_format_t format);
1329
1330 /**
1331  * snd_pcm_stream_str - Get a string naming the direction of a stream
1332  * @substream: the pcm substream instance
1333  *
1334  * Return: A string naming the direction of the stream.
1335  */
1336 static inline const char *snd_pcm_stream_str(struct snd_pcm_substream *substream)
1337 {
1338         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1339                 return "Playback";
1340         else
1341                 return "Capture";
1342 }
1343
1344 /*
1345  * PCM channel-mapping control API
1346  */
1347 /* array element of channel maps */
1348 struct snd_pcm_chmap_elem {
1349         unsigned char channels;
1350         unsigned char map[15];
1351 };
1352
1353 /* channel map information; retrieved via snd_kcontrol_chip() */
1354 struct snd_pcm_chmap {
1355         struct snd_pcm *pcm;    /* assigned PCM instance */
1356         int stream;             /* PLAYBACK or CAPTURE */
1357         struct snd_kcontrol *kctl;
1358         const struct snd_pcm_chmap_elem *chmap;
1359         unsigned int max_channels;
1360         unsigned int channel_mask;      /* optional: active channels bitmask */
1361         void *private_data;     /* optional: private data pointer */
1362 };
1363
1364 /**
1365  * snd_pcm_chmap_substream - get the PCM substream assigned to the given chmap info
1366  * @info: chmap information
1367  * @idx: the substream number index
1368  */
1369 static inline struct snd_pcm_substream *
1370 snd_pcm_chmap_substream(struct snd_pcm_chmap *info, unsigned int idx)
1371 {
1372         struct snd_pcm_substream *s;
1373         for (s = info->pcm->streams[info->stream].substream; s; s = s->next)
1374                 if (s->number == idx)
1375                         return s;
1376         return NULL;
1377 }
1378
1379 /* ALSA-standard channel maps (RL/RR prior to C/LFE) */
1380 extern const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[];
1381 /* Other world's standard channel maps (C/LFE prior to RL/RR) */
1382 extern const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[];
1383
1384 /* bit masks to be passed to snd_pcm_chmap.channel_mask field */
1385 #define SND_PCM_CHMAP_MASK_24   ((1U << 2) | (1U << 4))
1386 #define SND_PCM_CHMAP_MASK_246  (SND_PCM_CHMAP_MASK_24 | (1U << 6))
1387 #define SND_PCM_CHMAP_MASK_2468 (SND_PCM_CHMAP_MASK_246 | (1U << 8))
1388
1389 int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
1390                            const struct snd_pcm_chmap_elem *chmap,
1391                            int max_channels,
1392                            unsigned long private_value,
1393                            struct snd_pcm_chmap **info_ret);
1394
1395 /**
1396  * pcm_format_to_bits - Strong-typed conversion of pcm_format to bitwise
1397  * @pcm_format: PCM format
1398  */
1399 static inline u64 pcm_format_to_bits(snd_pcm_format_t pcm_format)
1400 {
1401         return 1ULL << (__force int) pcm_format;
1402 }
1403
1404 /* printk helpers */
1405 #define pcm_err(pcm, fmt, args...) \
1406         dev_err((pcm)->card->dev, fmt, ##args)
1407 #define pcm_warn(pcm, fmt, args...) \
1408         dev_warn((pcm)->card->dev, fmt, ##args)
1409 #define pcm_dbg(pcm, fmt, args...) \
1410         dev_dbg((pcm)->card->dev, fmt, ##args)
1411
1412 #endif /* __SOUND_PCM_H */