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 IS_ENABLED(CONFIG_SND_PCM_OSS)
  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 (*fill_silence)(struct snd_pcm_substream *substream, int channel,
  82                             unsigned long pos, unsigned long bytes);
  83         int (*copy_user)(struct snd_pcm_substream *substream, int channel,
  84                          unsigned long pos, void __user *buf,
  85                          unsigned long bytes);
  86         int (*copy_kernel)(struct snd_pcm_substream *substream, int channel,
  87                            unsigned long pos, void *buf, unsigned long bytes);
  88         struct page *(*page)(struct snd_pcm_substream *substream,
  89                              unsigned long offset);
  90         int (*mmap)(struct snd_pcm_substream *substream, struct vm_area_struct *vma);
  91         int (*ack)(struct snd_pcm_substream *substream);
  92 };
  93
  94 /*
  95  *
  96  */
  97
  98 #if defined(CONFIG_SND_DYNAMIC_MINORS)
  99 #define SNDRV_PCM_DEVICES       (SNDRV_OS_MINORS-2)
 100 #else
 101 #define SNDRV_PCM_DEVICES       8
 102 #endif
 103
 104 #define SNDRV_PCM_IOCTL1_RESET          0
 105 /* 1 is absent slot. */
 106 #define SNDRV_PCM_IOCTL1_CHANNEL_INFO   2
 107 /* 3 is absent slot. */
 108 #define SNDRV_PCM_IOCTL1_FIFO_SIZE      4
 109
 110 #define SNDRV_PCM_TRIGGER_STOP          0
 111 #define SNDRV_PCM_TRIGGER_START         1
 112 #define SNDRV_PCM_TRIGGER_PAUSE_PUSH    3
 113 #define SNDRV_PCM_TRIGGER_PAUSE_RELEASE 4
 114 #define SNDRV_PCM_TRIGGER_SUSPEND       5
 115 #define SNDRV_PCM_TRIGGER_RESUME        6
 116 #define SNDRV_PCM_TRIGGER_DRAIN         7
 117
 118 #define SNDRV_PCM_POS_XRUN              ((snd_pcm_uframes_t)-1)
 119
 120 /* If you change this don't forget to change rates[] table in pcm_native.c */
 121 #define SNDRV_PCM_RATE_5512             (1<<0)          /* 5512Hz */
 122 #define SNDRV_PCM_RATE_8000             (1<<1)          /* 8000Hz */
 123 #define SNDRV_PCM_RATE_11025            (1<<2)          /* 11025Hz */
 124 #define SNDRV_PCM_RATE_16000            (1<<3)          /* 16000Hz */
 125 #define SNDRV_PCM_RATE_22050            (1<<4)          /* 22050Hz */
 126 #define SNDRV_PCM_RATE_32000            (1<<5)          /* 32000Hz */
 127 #define SNDRV_PCM_RATE_44100            (1<<6)          /* 44100Hz */
 128 #define SNDRV_PCM_RATE_48000            (1<<7)          /* 48000Hz */
 129 #define SNDRV_PCM_RATE_64000            (1<<8)          /* 64000Hz */
 130 #define SNDRV_PCM_RATE_88200            (1<<9)          /* 88200Hz */
 131 #define SNDRV_PCM_RATE_96000            (1<<10)         /* 96000Hz */
 132 #define SNDRV_PCM_RATE_176400           (1<<11)         /* 176400Hz */
 133 #define SNDRV_PCM_RATE_192000           (1<<12)         /* 192000Hz */
 134
 135 #define SNDRV_PCM_RATE_CONTINUOUS       (1<<30)         /* continuous range */
 136 #define SNDRV_PCM_RATE_KNOT             (1<<31)         /* supports more non-continuos rates */
 137
 138 #define SNDRV_PCM_RATE_8000_44100       (SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_11025|\
 139                                          SNDRV_PCM_RATE_16000|SNDRV_PCM_RATE_22050|\
 140                                          SNDRV_PCM_RATE_32000|SNDRV_PCM_RATE_44100)
 141 #define SNDRV_PCM_RATE_8000_48000       (SNDRV_PCM_RATE_8000_44100|SNDRV_PCM_RATE_48000)
 142 #define SNDRV_PCM_RATE_8000_96000       (SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_64000|\
 143                                          SNDRV_PCM_RATE_88200|SNDRV_PCM_RATE_96000)
 144 #define SNDRV_PCM_RATE_8000_192000      (SNDRV_PCM_RATE_8000_96000|SNDRV_PCM_RATE_176400|\
 145                                          SNDRV_PCM_RATE_192000)
 146 #define _SNDRV_PCM_FMTBIT(fmt)          (1ULL << (__force int)SNDRV_PCM_FORMAT_##fmt)
 147 #define SNDRV_PCM_FMTBIT_S8             _SNDRV_PCM_FMTBIT(S8)
 148 #define SNDRV_PCM_FMTBIT_U8             _SNDRV_PCM_FMTBIT(U8)
 149 #define SNDRV_PCM_FMTBIT_S16_LE         _SNDRV_PCM_FMTBIT(S16_LE)
 150 #define SNDRV_PCM_FMTBIT_S16_BE         _SNDRV_PCM_FMTBIT(S16_BE)
 151 #define SNDRV_PCM_FMTBIT_U16_LE         _SNDRV_PCM_FMTBIT(U16_LE)
 152 #define SNDRV_PCM_FMTBIT_U16_BE         _SNDRV_PCM_FMTBIT(U16_BE)
 153 #define SNDRV_PCM_FMTBIT_S24_LE         _SNDRV_PCM_FMTBIT(S24_LE)
 154 #define SNDRV_PCM_FMTBIT_S24_BE         _SNDRV_PCM_FMTBIT(S24_BE)
 155 #define SNDRV_PCM_FMTBIT_U24_LE         _SNDRV_PCM_FMTBIT(U24_LE)
 156 #define SNDRV_PCM_FMTBIT_U24_BE         _SNDRV_PCM_FMTBIT(U24_BE)
 157 #define SNDRV_PCM_FMTBIT_S32_LE         _SNDRV_PCM_FMTBIT(S32_LE)
 158 #define SNDRV_PCM_FMTBIT_S32_BE         _SNDRV_PCM_FMTBIT(S32_BE)
 159 #define SNDRV_PCM_FMTBIT_U32_LE         _SNDRV_PCM_FMTBIT(U32_LE)
 160 #define SNDRV_PCM_FMTBIT_U32_BE         _SNDRV_PCM_FMTBIT(U32_BE)
 161 #define SNDRV_PCM_FMTBIT_FLOAT_LE       _SNDRV_PCM_FMTBIT(FLOAT_LE)
 162 #define SNDRV_PCM_FMTBIT_FLOAT_BE       _SNDRV_PCM_FMTBIT(FLOAT_BE)
 163 #define SNDRV_PCM_FMTBIT_FLOAT64_LE     _SNDRV_PCM_FMTBIT(FLOAT64_LE)
 164 #define SNDRV_PCM_FMTBIT_FLOAT64_BE     _SNDRV_PCM_FMTBIT(FLOAT64_BE)
 165 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_LE)
 166 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_BE)
 167 #define SNDRV_PCM_FMTBIT_MU_LAW         _SNDRV_PCM_FMTBIT(MU_LAW)
 168 #define SNDRV_PCM_FMTBIT_A_LAW          _SNDRV_PCM_FMTBIT(A_LAW)
 169 #define SNDRV_PCM_FMTBIT_IMA_ADPCM      _SNDRV_PCM_FMTBIT(IMA_ADPCM)
 170 #define SNDRV_PCM_FMTBIT_MPEG           _SNDRV_PCM_FMTBIT(MPEG)
 171 #define SNDRV_PCM_FMTBIT_GSM            _SNDRV_PCM_FMTBIT(GSM)
 172 #define SNDRV_PCM_FMTBIT_S20_LE _SNDRV_PCM_FMTBIT(S20_LE)
 173 #define SNDRV_PCM_FMTBIT_U20_LE _SNDRV_PCM_FMTBIT(U20_LE)
 174 #define SNDRV_PCM_FMTBIT_S20_BE _SNDRV_PCM_FMTBIT(S20_BE)
 175 #define SNDRV_PCM_FMTBIT_U20_BE _SNDRV_PCM_FMTBIT(U20_BE)
 176 #define SNDRV_PCM_FMTBIT_SPECIAL        _SNDRV_PCM_FMTBIT(SPECIAL)
 177 #define SNDRV_PCM_FMTBIT_S24_3LE        _SNDRV_PCM_FMTBIT(S24_3LE)
 178 #define SNDRV_PCM_FMTBIT_U24_3LE        _SNDRV_PCM_FMTBIT(U24_3LE)
 179 #define SNDRV_PCM_FMTBIT_S24_3BE        _SNDRV_PCM_FMTBIT(S24_3BE)
 180 #define SNDRV_PCM_FMTBIT_U24_3BE        _SNDRV_PCM_FMTBIT(U24_3BE)
 181 #define SNDRV_PCM_FMTBIT_S20_3LE        _SNDRV_PCM_FMTBIT(S20_3LE)
 182 #define SNDRV_PCM_FMTBIT_U20_3LE        _SNDRV_PCM_FMTBIT(U20_3LE)
 183 #define SNDRV_PCM_FMTBIT_S20_3BE        _SNDRV_PCM_FMTBIT(S20_3BE)
 184 #define SNDRV_PCM_FMTBIT_U20_3BE        _SNDRV_PCM_FMTBIT(U20_3BE)
 185 #define SNDRV_PCM_FMTBIT_S18_3LE        _SNDRV_PCM_FMTBIT(S18_3LE)
 186 #define SNDRV_PCM_FMTBIT_U18_3LE        _SNDRV_PCM_FMTBIT(U18_3LE)
 187 #define SNDRV_PCM_FMTBIT_S18_3BE        _SNDRV_PCM_FMTBIT(S18_3BE)
 188 #define SNDRV_PCM_FMTBIT_U18_3BE        _SNDRV_PCM_FMTBIT(U18_3BE)
 189 #define SNDRV_PCM_FMTBIT_G723_24        _SNDRV_PCM_FMTBIT(G723_24)
 190 #define SNDRV_PCM_FMTBIT_G723_24_1B     _SNDRV_PCM_FMTBIT(G723_24_1B)
 191 #define SNDRV_PCM_FMTBIT_G723_40        _SNDRV_PCM_FMTBIT(G723_40)
 192 #define SNDRV_PCM_FMTBIT_G723_40_1B     _SNDRV_PCM_FMTBIT(G723_40_1B)
 193 #define SNDRV_PCM_FMTBIT_DSD_U8         _SNDRV_PCM_FMTBIT(DSD_U8)
 194 #define SNDRV_PCM_FMTBIT_DSD_U16_LE     _SNDRV_PCM_FMTBIT(DSD_U16_LE)
 195 #define SNDRV_PCM_FMTBIT_DSD_U32_LE     _SNDRV_PCM_FMTBIT(DSD_U32_LE)
 196 #define SNDRV_PCM_FMTBIT_DSD_U16_BE     _SNDRV_PCM_FMTBIT(DSD_U16_BE)
 197 #define SNDRV_PCM_FMTBIT_DSD_U32_BE     _SNDRV_PCM_FMTBIT(DSD_U32_BE)
 198
 199 #ifdef SNDRV_LITTLE_ENDIAN
 200 #define SNDRV_PCM_FMTBIT_S16            SNDRV_PCM_FMTBIT_S16_LE
 201 #define SNDRV_PCM_FMTBIT_U16            SNDRV_PCM_FMTBIT_U16_LE
 202 #define SNDRV_PCM_FMTBIT_S24            SNDRV_PCM_FMTBIT_S24_LE
 203 #define SNDRV_PCM_FMTBIT_U24            SNDRV_PCM_FMTBIT_U24_LE
 204 #define SNDRV_PCM_FMTBIT_S32            SNDRV_PCM_FMTBIT_S32_LE
 205 #define SNDRV_PCM_FMTBIT_U32            SNDRV_PCM_FMTBIT_U32_LE
 206 #define SNDRV_PCM_FMTBIT_FLOAT          SNDRV_PCM_FMTBIT_FLOAT_LE
 207 #define SNDRV_PCM_FMTBIT_FLOAT64        SNDRV_PCM_FMTBIT_FLOAT64_LE
 208 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE
 209 #define SNDRV_PCM_FMTBIT_S20            SNDRV_PCM_FMTBIT_S20_LE
 210 #define SNDRV_PCM_FMTBIT_U20            SNDRV_PCM_FMTBIT_U20_LE
 211 #endif
 212 #ifdef SNDRV_BIG_ENDIAN
 213 #define SNDRV_PCM_FMTBIT_S16            SNDRV_PCM_FMTBIT_S16_BE
 214 #define SNDRV_PCM_FMTBIT_U16            SNDRV_PCM_FMTBIT_U16_BE
 215 #define SNDRV_PCM_FMTBIT_S24            SNDRV_PCM_FMTBIT_S24_BE
 216 #define SNDRV_PCM_FMTBIT_U24            SNDRV_PCM_FMTBIT_U24_BE
 217 #define SNDRV_PCM_FMTBIT_S32            SNDRV_PCM_FMTBIT_S32_BE
 218 #define SNDRV_PCM_FMTBIT_U32            SNDRV_PCM_FMTBIT_U32_BE
 219 #define SNDRV_PCM_FMTBIT_FLOAT          SNDRV_PCM_FMTBIT_FLOAT_BE
 220 #define SNDRV_PCM_FMTBIT_FLOAT64        SNDRV_PCM_FMTBIT_FLOAT64_BE
 221 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE
 222 #define SNDRV_PCM_FMTBIT_S20            SNDRV_PCM_FMTBIT_S20_BE
 223 #define SNDRV_PCM_FMTBIT_U20            SNDRV_PCM_FMTBIT_U20_BE
 224 #endif
 225
 226 struct snd_pcm_file {
 227         struct snd_pcm_substream *substream;
 228         int no_compat_mmap;
 229         unsigned int user_pversion;     /* supported protocol version */
 230 };
 231
 232 struct snd_pcm_hw_rule;
 233 typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params,
 234                                       struct snd_pcm_hw_rule *rule);
 235
 236 struct snd_pcm_hw_rule {
 237         unsigned int cond;
 238         int var;
 239         int deps[4];
 240
 241         snd_pcm_hw_rule_func_t func;
 242         void *private;
 243 };
 244
 245 struct snd_pcm_hw_constraints {
 246         struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK -
 247                          SNDRV_PCM_HW_PARAM_FIRST_MASK + 1];
 248         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL -
 249                              SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
 250         unsigned int rules_num;
 251         unsigned int rules_all;
 252         struct snd_pcm_hw_rule *rules;
 253 };
 254
 255 static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs,
 256                                             snd_pcm_hw_param_t var)
 257 {
 258         return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 259 }
 260
 261 static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs,
 262                                                     snd_pcm_hw_param_t var)
 263 {
 264         return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 265 }
 266
 267 struct snd_ratnum {
 268         unsigned int num;
 269         unsigned int den_min, den_max, den_step;
 270 };
 271
 272 struct snd_ratden {
 273         unsigned int num_min, num_max, num_step;
 274         unsigned int den;
 275 };
 276
 277 struct snd_pcm_hw_constraint_ratnums {
 278         int nrats;
 279         const struct snd_ratnum *rats;
 280 };
 281
 282 struct snd_pcm_hw_constraint_ratdens {
 283         int nrats;
 284         const struct snd_ratden *rats;
 285 };
 286
 287 struct snd_pcm_hw_constraint_list {
 288         const unsigned int *list;
 289         unsigned int count;
 290         unsigned int mask;
 291 };
 292
 293 struct snd_pcm_hw_constraint_ranges {
 294         unsigned int count;
 295         const struct snd_interval *ranges;
 296         unsigned int mask;
 297 };
 298
 299 /*
 300  * userspace-provided audio timestamp config to kernel,
 301  * structure is for internal use only and filled with dedicated unpack routine
 302  */
 303 struct snd_pcm_audio_tstamp_config {
 304         /* 5 of max 16 bits used */
 305         u32 type_requested:4;
 306         u32 report_delay:1; /* add total delay to A/D or D/A */
 307 };
 308
 309 static inline void snd_pcm_unpack_audio_tstamp_config(__u32 data,
 310                                                 struct snd_pcm_audio_tstamp_config *config)
 311 {
 312         config->type_requested = data & 0xF;
 313         config->report_delay = (data >> 4) & 1;
 314 }
 315
 316 /*
 317  * kernel-provided audio timestamp report to user-space
 318  * structure is for internal use only and read by dedicated pack routine
 319  */
 320 struct snd_pcm_audio_tstamp_report {
 321         /* 6 of max 16 bits used for bit-fields */
 322
 323         /* for backwards compatibility */
 324         u32 valid:1;
 325
 326         /* actual type if hardware could not support requested timestamp */
 327         u32 actual_type:4;
 328
 329         /* accuracy represented in ns units */
 330         u32 accuracy_report:1; /* 0 if accuracy unknown, 1 if accuracy field is valid */
 331         u32 accuracy; /* up to 4.29s, will be packed in separate field  */
 332 };
 333
 334 static inline void snd_pcm_pack_audio_tstamp_report(__u32 *data, __u32 *accuracy,
 335                                                 const struct snd_pcm_audio_tstamp_report *report)
 336 {
 337         u32 tmp;
 338
 339         tmp = report->accuracy_report;
 340         tmp <<= 4;
 341         tmp |= report->actual_type;
 342         tmp <<= 1;
 343         tmp |= report->valid;
 344
 345         *data &= 0xffff; /* zero-clear MSBs */
 346         *data |= (tmp << 16);
 347         *accuracy = report->accuracy;
 348 }
 349
 350
 351 struct snd_pcm_runtime {
 352         /* -- Status -- */
 353         struct snd_pcm_substream *trigger_master;
 354         struct timespec trigger_tstamp; /* trigger timestamp */
 355         bool trigger_tstamp_latched;     /* trigger timestamp latched in low-level driver/hardware */
 356         int overrange;
 357         snd_pcm_uframes_t avail_max;
 358         snd_pcm_uframes_t hw_ptr_base;  /* Position at buffer restart */
 359         snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time */
 360         unsigned long hw_ptr_jiffies;   /* Time when hw_ptr is updated */
 361         unsigned long hw_ptr_buffer_jiffies; /* buffer time in jiffies */
 362         snd_pcm_sframes_t delay;        /* extra delay; typically FIFO size */
 363         u64 hw_ptr_wrap;                /* offset for hw_ptr due to boundary wrap-around */
 364
 365         /* -- HW params -- */
 366         snd_pcm_access_t access;        /* access mode */
 367         snd_pcm_format_t format;        /* SNDRV_PCM_FORMAT_* */
 368         snd_pcm_subformat_t subformat;  /* subformat */
 369         unsigned int rate;              /* rate in Hz */
 370         unsigned int channels;          /* channels */
 371         snd_pcm_uframes_t period_size;  /* period size */
 372         unsigned int periods;           /* periods */
 373         snd_pcm_uframes_t buffer_size;  /* buffer size */
 374         snd_pcm_uframes_t min_align;    /* Min alignment for the format */
 375         size_t byte_align;
 376         unsigned int frame_bits;
 377         unsigned int sample_bits;
 378         unsigned int info;
 379         unsigned int rate_num;
 380         unsigned int rate_den;
 381         unsigned int no_period_wakeup: 1;
 382
 383         /* -- SW params -- */
 384         int tstamp_mode;                /* mmap timestamp is updated */
 385         unsigned int period_step;
 386         snd_pcm_uframes_t start_threshold;
 387         snd_pcm_uframes_t stop_threshold;
 388         snd_pcm_uframes_t silence_threshold; /* Silence filling happens when
 389                                                 noise is nearest than this */
 390         snd_pcm_uframes_t silence_size; /* Silence filling size */
 391         snd_pcm_uframes_t boundary;     /* pointers wrap point */
 392
 393         snd_pcm_uframes_t silence_start; /* starting pointer to silence area */
 394         snd_pcm_uframes_t silence_filled; /* size filled with silence */
 395
 396         union snd_pcm_sync_id sync;     /* hardware synchronization ID */
 397
 398         /* -- mmap -- */
 399         struct snd_pcm_mmap_status *status;
 400         struct snd_pcm_mmap_control *control;
 401
 402         /* -- locking / scheduling -- */
 403         snd_pcm_uframes_t twake;        /* do transfer (!poll) wakeup if non-zero */
 404         wait_queue_head_t sleep;        /* poll sleep */
 405         wait_queue_head_t tsleep;       /* transfer sleep */
 406         struct fasync_struct *fasync;
 407
 408         /* -- private section -- */
 409         void *private_data;
 410         void (*private_free)(struct snd_pcm_runtime *runtime);
 411
 412         /* -- hardware description -- */
 413         struct snd_pcm_hardware hw;
 414         struct snd_pcm_hw_constraints hw_constraints;
 415
 416         /* -- timer -- */
 417         unsigned int timer_resolution;  /* timer resolution */
 418         int tstamp_type;                /* timestamp type */
 419
 420         /* -- DMA -- */
 421         unsigned char *dma_area;        /* DMA area */
 422         dma_addr_t dma_addr;            /* physical bus address (not accessible from main CPU) */
 423         size_t dma_bytes;               /* size of DMA area */
 424
 425         struct snd_dma_buffer *dma_buffer_p;    /* allocated buffer */
 426
 427         /* -- audio timestamp config -- */
 428         struct snd_pcm_audio_tstamp_config audio_tstamp_config;
 429         struct snd_pcm_audio_tstamp_report audio_tstamp_report;
 430         struct timespec driver_tstamp;
 431
 432 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
 433         /* -- OSS things -- */
 434         struct snd_pcm_oss_runtime oss;
 435 #endif
 436 };
 437
 438 struct snd_pcm_group {          /* keep linked substreams */
 439         spinlock_t lock;
 440         struct mutex mutex;
 441         struct list_head substreams;
 442         int count;
 443 };
 444
 445 struct pid;
 446
 447 struct snd_pcm_substream {
 448         struct snd_pcm *pcm;
 449         struct snd_pcm_str *pstr;
 450         void *private_data;             /* copied from pcm->private_data */
 451         int number;
 452         char name[32];                  /* substream name */
 453         int stream;                     /* stream (direction) */
 454         struct pm_qos_request latency_pm_qos_req; /* pm_qos request */
 455         size_t buffer_bytes_max;        /* limit ring buffer size */
 456         struct snd_dma_buffer dma_buffer;
 457         size_t dma_max;
 458         /* -- hardware operations -- */
 459         const struct snd_pcm_ops *ops;
 460         /* -- runtime information -- */
 461         struct snd_pcm_runtime *runtime;
 462         /* -- timer section -- */
 463         struct snd_timer *timer;                /* timer */
 464         unsigned timer_running: 1;      /* time is running */
 465         /* -- next substream -- */
 466         struct snd_pcm_substream *next;
 467         /* -- linked substreams -- */
 468         struct list_head link_list;     /* linked list member */
 469         struct snd_pcm_group self_group;        /* fake group for non linked substream (with substream lock inside) */
 470         struct snd_pcm_group *group;            /* pointer to current group */
 471         /* -- assigned files -- */
 472         void *file;
 473         int ref_count;
 474         atomic_t mmap_count;
 475         unsigned int f_flags;
 476         void (*pcm_release)(struct snd_pcm_substream *);
 477         struct pid *pid;
 478 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
 479         /* -- OSS things -- */
 480         struct snd_pcm_oss_substream oss;
 481 #endif
 482 #ifdef CONFIG_SND_VERBOSE_PROCFS
 483         struct snd_info_entry *proc_root;
 484         struct snd_info_entry *proc_info_entry;
 485         struct snd_info_entry *proc_hw_params_entry;
 486         struct snd_info_entry *proc_sw_params_entry;
 487         struct snd_info_entry *proc_status_entry;
 488         struct snd_info_entry *proc_prealloc_entry;
 489         struct snd_info_entry *proc_prealloc_max_entry;
 490 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 491         struct snd_info_entry *proc_xrun_injection_entry;
 492 #endif
 493 #endif /* CONFIG_SND_VERBOSE_PROCFS */
 494         /* misc flags */
 495         unsigned int hw_opened: 1;
 496 };
 497
 498 #define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0)
 499
 500
 501 struct snd_pcm_str {
 502         int stream;                             /* stream (direction) */
 503         struct snd_pcm *pcm;
 504         /* -- substreams -- */
 505         unsigned int substream_count;
 506         unsigned int substream_opened;
 507         struct snd_pcm_substream *substream;
 508 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
 509         /* -- OSS things -- */
 510         struct snd_pcm_oss_stream oss;
 511 #endif
 512 #ifdef CONFIG_SND_VERBOSE_PROCFS
 513         struct snd_info_entry *proc_root;
 514         struct snd_info_entry *proc_info_entry;
 515 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 516         unsigned int xrun_debug;        /* 0 = disabled, 1 = verbose, 2 = stacktrace */
 517         struct snd_info_entry *proc_xrun_debug_entry;
 518 #endif
 519 #endif
 520         struct snd_kcontrol *chmap_kctl; /* channel-mapping controls */
 521         struct device dev;
 522 };
 523
 524 struct snd_pcm {
 525         struct snd_card *card;
 526         struct list_head list;
 527         int device; /* device number */
 528         unsigned int info_flags;
 529         unsigned short dev_class;
 530         unsigned short dev_subclass;
 531         char id[64];
 532         char name[80];
 533         struct snd_pcm_str streams[2];
 534         struct mutex open_mutex;
 535         wait_queue_head_t open_wait;
 536         void *private_data;
 537         void (*private_free) (struct snd_pcm *pcm);
 538         bool internal; /* pcm is for internal use only */
 539         bool nonatomic; /* whole PCM operations are in non-atomic context */
 540 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
 541         struct snd_pcm_oss oss;
 542 #endif
 543 };
 544
 545 /*
 546  *  Registering
 547  */
 548
 549 extern const struct file_operations snd_pcm_f_ops[2];
 550
 551 int snd_pcm_new(struct snd_card *card, const char *id, int device,
 552                 int playback_count, int capture_count,
 553                 struct snd_pcm **rpcm);
 554 int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
 555                 int playback_count, int capture_count,
 556                 struct snd_pcm **rpcm);
 557 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
 558
 559 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
 560 struct snd_pcm_notify {
 561         int (*n_register) (struct snd_pcm * pcm);
 562         int (*n_disconnect) (struct snd_pcm * pcm);
 563         int (*n_unregister) (struct snd_pcm * pcm);
 564         struct list_head list;
 565 };
 566 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
 567 #endif
 568
 569 /*
 570  *  Native I/O
 571  */
 572
 573 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
 574 int snd_pcm_info_user(struct snd_pcm_substream *substream,
 575                       struct snd_pcm_info __user *info);
 576 int snd_pcm_status(struct snd_pcm_substream *substream,
 577                    struct snd_pcm_status *status);
 578 int snd_pcm_start(struct snd_pcm_substream *substream);
 579 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t status);
 580 int snd_pcm_drain_done(struct snd_pcm_substream *substream);
 581 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream);
 582 #ifdef CONFIG_PM
 583 int snd_pcm_suspend(struct snd_pcm_substream *substream);
 584 int snd_pcm_suspend_all(struct snd_pcm *pcm);
 585 #else
 586 static inline int snd_pcm_suspend(struct snd_pcm_substream *substream)
 587 {
 588         return 0;
 589 }
 590 static inline int snd_pcm_suspend_all(struct snd_pcm *pcm)
 591 {
 592         return 0;
 593 }
 594 #endif
 595 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
 596 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
 597                            struct snd_pcm_substream **rsubstream);
 598 void snd_pcm_release_substream(struct snd_pcm_substream *substream);
 599 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
 600                              struct snd_pcm_substream **rsubstream);
 601 void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
 602 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
 603
 604
 605 #ifdef CONFIG_SND_DEBUG
 606 void snd_pcm_debug_name(struct snd_pcm_substream *substream,
 607                            char *name, size_t len);
 608 #else
 609 static inline void
 610 snd_pcm_debug_name(struct snd_pcm_substream *substream, char *buf, size_t size)
 611 {
 612         *buf = 0;
 613 }
 614 #endif
 615
 616 /*
 617  *  PCM library
 618  */
 619
 620 /**
 621  * snd_pcm_stream_linked - Check whether the substream is linked with others
 622  * @substream: substream to check
 623  *
 624  * Returns true if the given substream is being linked with others.
 625  */
 626 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
 627 {
 628         return substream->group != &substream->self_group;
 629 }
 630
 631 void snd_pcm_stream_lock(struct snd_pcm_substream *substream);
 632 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream);
 633 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream);
 634 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream);
 635 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream);
 636
 637 /**
 638  * snd_pcm_stream_lock_irqsave - Lock the PCM stream
 639  * @substream: PCM substream
 640  * @flags: irq flags
 641  *
 642  * This locks the PCM stream like snd_pcm_stream_lock() but with the local
 643  * IRQ (only when nonatomic is false).  In nonatomic case, this is identical
 644  * as snd_pcm_stream_lock().
 645  */
 646 #define snd_pcm_stream_lock_irqsave(substream, flags)            \
 647         do {                                                     \
 648                 typecheck(unsigned long, flags);                 \
 649                 flags = _snd_pcm_stream_lock_irqsave(substream); \
 650         } while (0)
 651 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
 652                                       unsigned long flags);
 653
 654 /**
 655  * snd_pcm_group_for_each_entry - iterate over the linked substreams
 656  * @s: the iterator
 657  * @substream: the substream
 658  *
 659  * Iterate over the all linked substreams to the given @substream.
 660  * When @substream isn't linked with any others, this gives returns @substream
 661  * itself once.
 662  */
 663 #define snd_pcm_group_for_each_entry(s, substream) \
 664         list_for_each_entry(s, &substream->group->substreams, link_list)
 665
 666 /**
 667  * snd_pcm_running - Check whether the substream is in a running state
 668  * @substream: substream to check
 669  *
 670  * Returns true if the given substream is in the state RUNNING, or in the
 671  * state DRAINING for playback.
 672  */
 673 static inline int snd_pcm_running(struct snd_pcm_substream *substream)
 674 {
 675         return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 676                 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
 677                  substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
 678 }
 679
 680 /**
 681  * bytes_to_samples - Unit conversion of the size from bytes to samples
 682  * @runtime: PCM runtime instance
 683  * @size: size in bytes
 684  */
 685 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
 686 {
 687         return size * 8 / runtime->sample_bits;
 688 }
 689
 690 /**
 691  * bytes_to_frames - Unit conversion of the size from bytes to frames
 692  * @runtime: PCM runtime instance
 693  * @size: size in bytes
 694  */
 695 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
 696 {
 697         return size * 8 / runtime->frame_bits;
 698 }
 699
 700 /**
 701  * samples_to_bytes - Unit conversion of the size from samples to bytes
 702  * @runtime: PCM runtime instance
 703  * @size: size in samples
 704  */
 705 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
 706 {
 707         return size * runtime->sample_bits / 8;
 708 }
 709
 710 /**
 711  * frames_to_bytes - Unit conversion of the size from frames to bytes
 712  * @runtime: PCM runtime instance
 713  * @size: size in frames
 714  */
 715 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
 716 {
 717         return size * runtime->frame_bits / 8;
 718 }
 719
 720 /**
 721  * frame_aligned - Check whether the byte size is aligned to frames
 722  * @runtime: PCM runtime instance
 723  * @bytes: size in bytes
 724  */
 725 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
 726 {
 727         return bytes % runtime->byte_align == 0;
 728 }
 729
 730 /**
 731  * snd_pcm_lib_buffer_bytes - Get the buffer size of the current PCM in bytes
 732  * @substream: PCM substream
 733  */
 734 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
 735 {
 736         struct snd_pcm_runtime *runtime = substream->runtime;
 737         return frames_to_bytes(runtime, runtime->buffer_size);
 738 }
 739
 740 /**
 741  * snd_pcm_lib_period_bytes - Get the period size of the current PCM in bytes
 742  * @substream: PCM substream
 743  */
 744 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
 745 {
 746         struct snd_pcm_runtime *runtime = substream->runtime;
 747         return frames_to_bytes(runtime, runtime->period_size);
 748 }
 749
 750 /**
 751  * snd_pcm_playback_avail - Get the available (writable) space for playback
 752  * @runtime: PCM runtime instance
 753  *
 754  * Result is between 0 ... (boundary - 1)
 755  */
 756 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
 757 {
 758         snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
 759         if (avail < 0)
 760                 avail += runtime->boundary;
 761         else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
 762                 avail -= runtime->boundary;
 763         return avail;
 764 }
 765
 766 /**
 767  * snd_pcm_playback_avail - Get the available (readable) space for capture
 768  * @runtime: PCM runtime instance
 769  *
 770  * Result is between 0 ... (boundary - 1)
 771  */
 772 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
 773 {
 774         snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
 775         if (avail < 0)
 776                 avail += runtime->boundary;
 777         return avail;
 778 }
 779
 780 /**
 781  * snd_pcm_playback_hw_avail - Get the queued space for playback
 782  * @runtime: PCM runtime instance
 783  */
 784 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
 785 {
 786         return runtime->buffer_size - snd_pcm_playback_avail(runtime);
 787 }
 788
 789 /**
 790  * snd_pcm_capture_hw_avail - Get the free space for capture
 791  * @runtime: PCM runtime instance
 792  */
 793 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
 794 {
 795         return runtime->buffer_size - snd_pcm_capture_avail(runtime);
 796 }
 797
 798 /**
 799  * snd_pcm_playback_ready - check whether the playback buffer is available
 800  * @substream: the pcm substream instance
 801  *
 802  * Checks whether enough free space is available on the playback buffer.
 803  *
 804  * Return: Non-zero if available, or zero if not.
 805  */
 806 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
 807 {
 808         struct snd_pcm_runtime *runtime = substream->runtime;
 809         return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
 810 }
 811
 812 /**
 813  * snd_pcm_capture_ready - check whether the capture buffer is available
 814  * @substream: the pcm substream instance
 815  *
 816  * Checks whether enough capture data is available on the capture buffer.
 817  *
 818  * Return: Non-zero if available, or zero if not.
 819  */
 820 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
 821 {
 822         struct snd_pcm_runtime *runtime = substream->runtime;
 823         return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
 824 }
 825
 826 /**
 827  * snd_pcm_playback_data - check whether any data exists on the playback buffer
 828  * @substream: the pcm substream instance
 829  *
 830  * Checks whether any data exists on the playback buffer.
 831  *
 832  * Return: Non-zero if any data exists, or zero if not. If stop_threshold
 833  * is bigger or equal to boundary, then this function returns always non-zero.
 834  */
 835 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
 836 {
 837         struct snd_pcm_runtime *runtime = substream->runtime;
 838
 839         if (runtime->stop_threshold >= runtime->boundary)
 840                 return 1;
 841         return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
 842 }
 843
 844 /**
 845  * snd_pcm_playback_empty - check whether the playback buffer is empty
 846  * @substream: the pcm substream instance
 847  *
 848  * Checks whether the playback buffer is empty.
 849  *
 850  * Return: Non-zero if empty, or zero if not.
 851  */
 852 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
 853 {
 854         struct snd_pcm_runtime *runtime = substream->runtime;
 855         return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
 856 }
 857
 858 /**
 859  * snd_pcm_capture_empty - check whether the capture buffer is empty
 860  * @substream: the pcm substream instance
 861  *
 862  * Checks whether the capture buffer is empty.
 863  *
 864  * Return: Non-zero if empty, or zero if not.
 865  */
 866 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
 867 {
 868         struct snd_pcm_runtime *runtime = substream->runtime;
 869         return snd_pcm_capture_avail(runtime) == 0;
 870 }
 871
 872 /**
 873  * snd_pcm_trigger_done - Mark the master substream
 874  * @substream: the pcm substream instance
 875  * @master: the linked master substream
 876  *
 877  * When multiple substreams of the same card are linked and the hardware
 878  * supports the single-shot operation, the driver calls this in the loop
 879  * in snd_pcm_group_for_each_entry() for marking the substream as "done".
 880  * Then most of trigger operations are performed only to the given master
 881  * substream.
 882  *
 883  * The trigger_master mark is cleared at timestamp updates at the end
 884  * of trigger operations.
 885  */
 886 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream,
 887                                         struct snd_pcm_substream *master)
 888 {
 889         substream->runtime->trigger_master = master;
 890 }
 891
 892 static inline int hw_is_mask(int var)
 893 {
 894         return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
 895                 var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
 896 }
 897
 898 static inline int hw_is_interval(int var)
 899 {
 900         return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
 901                 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
 902 }
 903
 904 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
 905                                      snd_pcm_hw_param_t var)
 906 {
 907         return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 908 }
 909
 910 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
 911                                              snd_pcm_hw_param_t var)
 912 {
 913         return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 914 }
 915
 916 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
 917                                              snd_pcm_hw_param_t var)
 918 {
 919         return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 920 }
 921
 922 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
 923                                                      snd_pcm_hw_param_t var)
 924 {
 925         return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 926 }
 927
 928 /**
 929  * params_channels - Get the number of channels from the hw params
 930  * @p: hw params
 931  */
 932 static inline unsigned int params_channels(const struct snd_pcm_hw_params *p)
 933 {
 934         return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_CHANNELS)->min;
 935 }
 936
 937 /**
 938  * params_rate - Get the sample rate from the hw params
 939  * @p: hw params
 940  */
 941 static inline unsigned int params_rate(const struct snd_pcm_hw_params *p)
 942 {
 943         return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_RATE)->min;
 944 }
 945
 946 /**
 947  * params_period_size - Get the period size (in frames) from the hw params
 948  * @p: hw params
 949  */
 950 static inline unsigned int params_period_size(const struct snd_pcm_hw_params *p)
 951 {
 952         return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min;
 953 }
 954
 955 /**
 956  * params_periods - Get the number of periods from the hw params
 957  * @p: hw params
 958  */
 959 static inline unsigned int params_periods(const struct snd_pcm_hw_params *p)
 960 {
 961         return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIODS)->min;
 962 }
 963
 964 /**
 965  * params_buffer_size - Get the buffer size (in frames) from the hw params
 966  * @p: hw params
 967  */
 968 static inline unsigned int params_buffer_size(const struct snd_pcm_hw_params *p)
 969 {
 970         return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min;
 971 }
 972
 973 /**
 974  * params_buffer_bytes - Get the buffer size (in bytes) from the hw params
 975  * @p: hw params
 976  */
 977 static inline unsigned int params_buffer_bytes(const struct snd_pcm_hw_params *p)
 978 {
 979         return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min;
 980 }
 981
 982 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
 983 int snd_interval_list(struct snd_interval *i, unsigned int count,
 984                       const unsigned int *list, unsigned int mask);
 985 int snd_interval_ranges(struct snd_interval *i, unsigned int count,
 986                         const struct snd_interval *list, unsigned int mask);
 987 int snd_interval_ratnum(struct snd_interval *i,
 988                         unsigned int rats_count, const struct snd_ratnum *rats,
 989                         unsigned int *nump, unsigned int *denp);
 990
 991 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
 992 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
 993
 994 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
 995
 996 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 997                                  u_int64_t mask);
 998 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 999                                  unsigned int min, unsigned int max);
1000 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
1001 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
1002                                unsigned int cond,
1003                                snd_pcm_hw_param_t var,
1004                                const struct snd_pcm_hw_constraint_list *l);
1005 int snd_pcm_hw_constraint_ranges(struct snd_pcm_runtime *runtime,
1006                                  unsigned int cond,
1007                                  snd_pcm_hw_param_t var,
1008                                  const struct snd_pcm_hw_constraint_ranges *r);
1009 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
1010                                   unsigned int cond,
1011                                   snd_pcm_hw_param_t var,
1012                                   const struct snd_pcm_hw_constraint_ratnums *r);
1013 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1014                                   unsigned int cond,
1015                                   snd_pcm_hw_param_t var,
1016                                   const struct snd_pcm_hw_constraint_ratdens *r);
1017 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1018                                  unsigned int cond,
1019                                  unsigned int width,
1020                                  unsigned int msbits);
1021 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1022                                unsigned int cond,
1023                                snd_pcm_hw_param_t var,
1024                                unsigned long step);
1025 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1026                                unsigned int cond,
1027                                snd_pcm_hw_param_t var);
1028 int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
1029                                unsigned int base_rate);
1030 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
1031                         unsigned int cond,
1032                         int var,
1033                         snd_pcm_hw_rule_func_t func, void *private,
1034                         int dep, ...);
1035
1036 /**
1037  * snd_pcm_hw_constraint_single() - Constrain parameter to a single value
1038  * @runtime: PCM runtime instance
1039  * @var: The hw_params variable to constrain
1040  * @val: The value to constrain to
1041  *
1042  * Return: Positive if the value is changed, zero if it's not changed, or a
1043  * negative error code.
1044  */
1045 static inline int snd_pcm_hw_constraint_single(
1046         struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1047         unsigned int val)
1048 {
1049         return snd_pcm_hw_constraint_minmax(runtime, var, val, val);
1050 }
1051
1052 int snd_pcm_format_signed(snd_pcm_format_t format);
1053 int snd_pcm_format_unsigned(snd_pcm_format_t format);
1054 int snd_pcm_format_linear(snd_pcm_format_t format);
1055 int snd_pcm_format_little_endian(snd_pcm_format_t format);
1056 int snd_pcm_format_big_endian(snd_pcm_format_t format);
1057 #if 0 /* just for kernel-doc */
1058 /**
1059  * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
1060  * @format: the format to check
1061  *
1062  * Return: 1 if the given PCM format is CPU-endian, 0 if
1063  * opposite, or a negative error code if endian not specified.
1064  */
1065 int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
1066 #endif /* DocBook */
1067 #ifdef SNDRV_LITTLE_ENDIAN
1068 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
1069 #else
1070 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
1071 #endif
1072 int snd_pcm_format_width(snd_pcm_format_t format);                      /* in bits */
1073 int snd_pcm_format_physical_width(snd_pcm_format_t format);             /* in bits */
1074 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
1075 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
1076 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
1077
1078 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction,
1079                      const struct snd_pcm_ops *ops);
1080 void snd_pcm_set_sync(struct snd_pcm_substream *substream);
1081 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1082                       unsigned int cmd, void *arg);
1083 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
1084 snd_pcm_sframes_t __snd_pcm_lib_xfer(struct snd_pcm_substream *substream,
1085                                      void *buf, bool interleaved,
1086                                      snd_pcm_uframes_t frames, bool in_kernel);
1087
1088 static inline snd_pcm_sframes_t
1089 snd_pcm_lib_write(struct snd_pcm_substream *substream,
1090                   const void __user *buf, snd_pcm_uframes_t frames)
1091 {
1092         return __snd_pcm_lib_xfer(substream, (void *)buf, true, frames, false);
1093 }
1094
1095 static inline snd_pcm_sframes_t
1096 snd_pcm_lib_read(struct snd_pcm_substream *substream,
1097                  void __user *buf, snd_pcm_uframes_t frames)
1098 {
1099         return __snd_pcm_lib_xfer(substream, (void *)buf, true, frames, false);
1100 }
1101
1102 static inline snd_pcm_sframes_t
1103 snd_pcm_lib_writev(struct snd_pcm_substream *substream,
1104                    void __user **bufs, snd_pcm_uframes_t frames)
1105 {
1106         return __snd_pcm_lib_xfer(substream, (void *)bufs, false, frames, false);
1107 }
1108
1109 static inline snd_pcm_sframes_t
1110 snd_pcm_lib_readv(struct snd_pcm_substream *substream,
1111                   void __user **bufs, snd_pcm_uframes_t frames)
1112 {
1113         return __snd_pcm_lib_xfer(substream, (void *)bufs, false, frames, false);
1114 }
1115
1116 static inline snd_pcm_sframes_t
1117 snd_pcm_kernel_write(struct snd_pcm_substream *substream,
1118                      const void *buf, snd_pcm_uframes_t frames)
1119 {
1120         return __snd_pcm_lib_xfer(substream, (void *)buf, true, frames, true);
1121 }
1122
1123 static inline snd_pcm_sframes_t
1124 snd_pcm_kernel_read(struct snd_pcm_substream *substream,
1125                     void *buf, snd_pcm_uframes_t frames)
1126 {
1127         return __snd_pcm_lib_xfer(substream, buf, true, frames, true);
1128 }
1129
1130 static inline snd_pcm_sframes_t
1131 snd_pcm_kernel_writev(struct snd_pcm_substream *substream,
1132                       void **bufs, snd_pcm_uframes_t frames)
1133 {
1134         return __snd_pcm_lib_xfer(substream, bufs, false, frames, true);
1135 }
1136
1137 static inline snd_pcm_sframes_t
1138 snd_pcm_kernel_readv(struct snd_pcm_substream *substream,
1139                      void **bufs, snd_pcm_uframes_t frames)
1140 {
1141         return __snd_pcm_lib_xfer(substream, bufs, false, frames, true);
1142 }
1143
1144 int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime);
1145 unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate);
1146 unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit);
1147 unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a,
1148                                          unsigned int rates_b);
1149 unsigned int snd_pcm_rate_range_to_bits(unsigned int rate_min,
1150                                         unsigned int rate_max);
1151
1152 /**
1153  * snd_pcm_set_runtime_buffer - Set the PCM runtime buffer
1154  * @substream: PCM substream to set
1155  * @bufp: the buffer information, NULL to clear
1156  *
1157  * Copy the buffer information to runtime->dma_buffer when @bufp is non-NULL.
1158  * Otherwise it clears the current buffer information.
1159  */
1160 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
1161                                               struct snd_dma_buffer *bufp)
1162 {
1163         struct snd_pcm_runtime *runtime = substream->runtime;
1164         if (bufp) {
1165                 runtime->dma_buffer_p = bufp;
1166                 runtime->dma_area = bufp->area;
1167                 runtime->dma_addr = bufp->addr;
1168                 runtime->dma_bytes = bufp->bytes;
1169         } else {
1170                 runtime->dma_buffer_p = NULL;
1171                 runtime->dma_area = NULL;
1172                 runtime->dma_addr = 0;
1173                 runtime->dma_bytes = 0;
1174         }
1175 }
1176
1177 /**
1178  * snd_pcm_gettime - Fill the timespec depending on the timestamp mode
1179  * @runtime: PCM runtime instance
1180  * @tv: timespec to fill
1181  */
1182 static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime,
1183                                    struct timespec *tv)
1184 {
1185         switch (runtime->tstamp_type) {
1186         case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC:
1187                 ktime_get_ts(tv);
1188                 break;
1189         case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC_RAW:
1190                 getrawmonotonic(tv);
1191                 break;
1192         default:
1193                 getnstimeofday(tv);
1194                 break;
1195         }
1196 }
1197
1198 /*
1199  *  Memory
1200  */
1201
1202 int snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
1203 int snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
1204 int snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
1205                                   int type, struct device *data,
1206                                   size_t size, size_t max);
1207 int snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
1208                                           int type, void *data,
1209                                           size_t size, size_t max);
1210 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
1211 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
1212
1213 int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream,
1214                                       size_t size, gfp_t gfp_flags);
1215 int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream);
1216 struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream,
1217                                           unsigned long offset);
1218 /**
1219  * snd_pcm_lib_alloc_vmalloc_buffer - allocate virtual DMA buffer
1220  * @substream: the substream to allocate the buffer to
1221  * @size: the requested buffer size, in bytes
1222  *
1223  * Allocates the PCM substream buffer using vmalloc(), i.e., the memory is
1224  * contiguous in kernel virtual space, but not in physical memory.  Use this
1225  * if the buffer is accessed by kernel code but not by device DMA.
1226  *
1227  * Return: 1 if the buffer was changed, 0 if not changed, or a negative error
1228  * code.
1229  */
1230 static inline int snd_pcm_lib_alloc_vmalloc_buffer
1231                         (struct snd_pcm_substream *substream, size_t size)
1232 {
1233         return _snd_pcm_lib_alloc_vmalloc_buffer(substream, size,
1234                                                  GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
1235 }
1236
1237 /**
1238  * snd_pcm_lib_alloc_vmalloc_32_buffer - allocate 32-bit-addressable buffer
1239  * @substream: the substream to allocate the buffer to
1240  * @size: the requested buffer size, in bytes
1241  *
1242  * This function works like snd_pcm_lib_alloc_vmalloc_buffer(), but uses
1243  * vmalloc_32(), i.e., the pages are allocated from 32-bit-addressable memory.
1244  *
1245  * Return: 1 if the buffer was changed, 0 if not changed, or a negative error
1246  * code.
1247  */
1248 static inline int snd_pcm_lib_alloc_vmalloc_32_buffer
1249                         (struct snd_pcm_substream *substream, size_t size)
1250 {
1251         return _snd_pcm_lib_alloc_vmalloc_buffer(substream, size,
1252                                                  GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1253 }
1254
1255 #define snd_pcm_get_dma_buf(substream) ((substream)->runtime->dma_buffer_p)
1256
1257 #ifdef CONFIG_SND_DMA_SGBUF
1258 /*
1259  * SG-buffer handling
1260  */
1261 #define snd_pcm_substream_sgbuf(substream) \
1262         snd_pcm_get_dma_buf(substream)->private_data
1263
1264 struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream,
1265                                     unsigned long offset);
1266 #else /* !SND_DMA_SGBUF */
1267 /*
1268  * fake using a continuous buffer
1269  */
1270 #define snd_pcm_sgbuf_ops_page  NULL
1271 #endif /* SND_DMA_SGBUF */
1272
1273 /**
1274  * snd_pcm_sgbuf_get_addr - Get the DMA address at the corresponding offset
1275  * @substream: PCM substream
1276  * @ofs: byte offset
1277  */
1278 static inline dma_addr_t
1279 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
1280 {
1281         return snd_sgbuf_get_addr(snd_pcm_get_dma_buf(substream), ofs);
1282 }
1283
1284 /**
1285  * snd_pcm_sgbuf_get_ptr - Get the virtual address at the corresponding offset
1286  * @substream: PCM substream
1287  * @ofs: byte offset
1288  */
1289 static inline void *
1290 snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
1291 {
1292         return snd_sgbuf_get_ptr(snd_pcm_get_dma_buf(substream), ofs);
1293 }
1294
1295 /**
1296  * snd_pcm_sgbuf_chunk_size - Compute the max size that fits within the contig.
1297  * page from the given size
1298  * @substream: PCM substream
1299  * @ofs: byte offset
1300  * @size: byte size to examine
1301  */
1302 static inline unsigned int
1303 snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
1304                              unsigned int ofs, unsigned int size)
1305 {
1306         return snd_sgbuf_get_chunk_size(snd_pcm_get_dma_buf(substream), ofs, size);
1307 }
1308
1309 /**
1310  * snd_pcm_mmap_data_open - increase the mmap counter
1311  * @area: VMA
1312  *
1313  * PCM mmap callback should handle this counter properly
1314  */
1315 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
1316 {
1317         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1318         atomic_inc(&substream->mmap_count);
1319 }
1320
1321 /**
1322  * snd_pcm_mmap_data_close - decrease the mmap counter
1323  * @area: VMA
1324  *
1325  * PCM mmap callback should handle this counter properly
1326  */
1327 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
1328 {
1329         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1330         atomic_dec(&substream->mmap_count);
1331 }
1332
1333 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
1334                              struct vm_area_struct *area);
1335 /* mmap for io-memory area */
1336 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
1337 #define SNDRV_PCM_INFO_MMAP_IOMEM       SNDRV_PCM_INFO_MMAP
1338 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
1339 #else
1340 #define SNDRV_PCM_INFO_MMAP_IOMEM       0
1341 #define snd_pcm_lib_mmap_iomem  NULL
1342 #endif
1343
1344 #define snd_pcm_lib_mmap_vmalloc NULL
1345
1346 /**
1347  * snd_pcm_limit_isa_dma_size - Get the max size fitting with ISA DMA transfer
1348  * @dma: DMA number
1349  * @max: pointer to store the max size
1350  */
1351 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
1352 {
1353         *max = dma < 4 ? 64 * 1024 : 128 * 1024;
1354 }
1355
1356 /*
1357  *  Misc
1358  */
1359
1360 #define SNDRV_PCM_DEFAULT_CON_SPDIF     (IEC958_AES0_CON_EMPHASIS_NONE|\
1361                                          (IEC958_AES1_CON_ORIGINAL<<8)|\
1362                                          (IEC958_AES1_CON_PCM_CODER<<8)|\
1363                                          (IEC958_AES3_CON_FS_48000<<24))
1364
1365 #define PCM_RUNTIME_CHECK(sub) snd_BUG_ON(!(sub) || !(sub)->runtime)
1366
1367 const char *snd_pcm_format_name(snd_pcm_format_t format);
1368
1369 /**
1370  * snd_pcm_stream_str - Get a string naming the direction of a stream
1371  * @substream: the pcm substream instance
1372  *
1373  * Return: A string naming the direction of the stream.
1374  */
1375 static inline const char *snd_pcm_stream_str(struct snd_pcm_substream *substream)
1376 {
1377         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1378                 return "Playback";
1379         else
1380                 return "Capture";
1381 }
1382
1383 /*
1384  * PCM channel-mapping control API
1385  */
1386 /* array element of channel maps */
1387 struct snd_pcm_chmap_elem {
1388         unsigned char channels;
1389         unsigned char map[15];
1390 };
1391
1392 /* channel map information; retrieved via snd_kcontrol_chip() */
1393 struct snd_pcm_chmap {
1394         struct snd_pcm *pcm;    /* assigned PCM instance */
1395         int stream;             /* PLAYBACK or CAPTURE */
1396         struct snd_kcontrol *kctl;
1397         const struct snd_pcm_chmap_elem *chmap;
1398         unsigned int max_channels;
1399         unsigned int channel_mask;      /* optional: active channels bitmask */
1400         void *private_data;     /* optional: private data pointer */
1401 };
1402
1403 /**
1404  * snd_pcm_chmap_substream - get the PCM substream assigned to the given chmap info
1405  * @info: chmap information
1406  * @idx: the substream number index
1407  */
1408 static inline struct snd_pcm_substream *
1409 snd_pcm_chmap_substream(struct snd_pcm_chmap *info, unsigned int idx)
1410 {
1411         struct snd_pcm_substream *s;
1412         for (s = info->pcm->streams[info->stream].substream; s; s = s->next)
1413                 if (s->number == idx)
1414                         return s;
1415         return NULL;
1416 }
1417
1418 /* ALSA-standard channel maps (RL/RR prior to C/LFE) */
1419 extern const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[];
1420 /* Other world's standard channel maps (C/LFE prior to RL/RR) */
1421 extern const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[];
1422
1423 /* bit masks to be passed to snd_pcm_chmap.channel_mask field */
1424 #define SND_PCM_CHMAP_MASK_24   ((1U << 2) | (1U << 4))
1425 #define SND_PCM_CHMAP_MASK_246  (SND_PCM_CHMAP_MASK_24 | (1U << 6))
1426 #define SND_PCM_CHMAP_MASK_2468 (SND_PCM_CHMAP_MASK_246 | (1U << 8))
1427
1428 int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
1429                            const struct snd_pcm_chmap_elem *chmap,
1430                            int max_channels,
1431                            unsigned long private_value,
1432                            struct snd_pcm_chmap **info_ret);
1433
1434 /**
1435  * pcm_format_to_bits - Strong-typed conversion of pcm_format to bitwise
1436  * @pcm_format: PCM format
1437  */
1438 static inline u64 pcm_format_to_bits(snd_pcm_format_t pcm_format)
1439 {
1440         return 1ULL << (__force int) pcm_format;
1441 }
1442
1443 /* printk helpers */
1444 #define pcm_err(pcm, fmt, args...) \
1445         dev_err((pcm)->card->dev, fmt, ##args)
1446 #define pcm_warn(pcm, fmt, args...) \
1447         dev_warn((pcm)->card->dev, fmt, ##args)
1448 #define pcm_dbg(pcm, fmt, args...) \
1449         dev_dbg((pcm)->card->dev, fmt, ##args)
1450
1451 #endif /* __SOUND_PCM_H */