include/sound/pcm.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 #ifndef __SOUND_PCM_H
   3 #define __SOUND_PCM_H
   4
   5 /*
   6  *  Digital Audio (PCM) abstract layer
   7  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   8  *                   Abramo Bagnara <abramo@alsa-project.org>
   9  */
  10
  11 #include <sound/asound.h>
  12 #include <sound/memalloc.h>
  13 #include <sound/minors.h>
  14 #include <linux/poll.h>
  15 #include <linux/mm.h>
  16 #include <linux/bitops.h>
  17 #include <linux/pm_qos.h>
  18 #include <linux/refcount.h>
  19
  20 #define snd_pcm_substream_chip(substream) ((substream)->private_data)
  21 #define snd_pcm_chip(pcm) ((pcm)->private_data)
  22
  23 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
  24 #include <sound/pcm_oss.h>
  25 #endif
  26
  27 /*
  28  *  Hardware (lowlevel) section
  29  */
  30
  31 struct snd_pcm_hardware {
  32         unsigned int info;              /* SNDRV_PCM_INFO_* */
  33         u64 formats;                    /* SNDRV_PCM_FMTBIT_* */
  34         unsigned int rates;             /* SNDRV_PCM_RATE_* */
  35         unsigned int rate_min;          /* min rate */
  36         unsigned int rate_max;          /* max rate */
  37         unsigned int channels_min;      /* min channels */
  38         unsigned int channels_max;      /* max channels */
  39         size_t buffer_bytes_max;        /* max buffer size */
  40         size_t period_bytes_min;        /* min period size */
  41         size_t period_bytes_max;        /* max period size */
  42         unsigned int periods_min;       /* min # of periods */
  43         unsigned int periods_max;       /* max # of periods */
  44         size_t fifo_size;               /* fifo size in bytes */
  45 };
  46
  47 struct snd_pcm_status64;
  48 struct snd_pcm_substream;
  49
  50 struct snd_pcm_audio_tstamp_config; /* definitions further down */
  51 struct snd_pcm_audio_tstamp_report;
  52
  53 struct snd_pcm_ops {
  54         int (*open)(struct snd_pcm_substream *substream);
  55         int (*close)(struct snd_pcm_substream *substream);
  56         int (*ioctl)(struct snd_pcm_substream * substream,
  57                      unsigned int cmd, void *arg);
  58         int (*hw_params)(struct snd_pcm_substream *substream,
  59                          struct snd_pcm_hw_params *params);
  60         int (*hw_free)(struct snd_pcm_substream *substream);
  61         int (*prepare)(struct snd_pcm_substream *substream);
  62         int (*trigger)(struct snd_pcm_substream *substream, int cmd);
  63         int (*sync_stop)(struct snd_pcm_substream *substream);
  64         snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *substream);
  65         int (*get_time_info)(struct snd_pcm_substream *substream,
  66                         struct timespec64 *system_ts, struct timespec64 *audio_ts,
  67                         struct snd_pcm_audio_tstamp_config *audio_tstamp_config,
  68                         struct snd_pcm_audio_tstamp_report *audio_tstamp_report);
  69         int (*fill_silence)(struct snd_pcm_substream *substream, int channel,
  70                             unsigned long pos, unsigned long bytes);
  71         int (*copy_user)(struct snd_pcm_substream *substream, int channel,
  72                          unsigned long pos, void __user *buf,
  73                          unsigned long bytes);
  74         int (*copy_kernel)(struct snd_pcm_substream *substream, int channel,
  75                            unsigned long pos, void *buf, unsigned long bytes);
  76         struct page *(*page)(struct snd_pcm_substream *substream,
  77                              unsigned long offset);
  78         int (*mmap)(struct snd_pcm_substream *substream, struct vm_area_struct *vma);
  79         int (*ack)(struct snd_pcm_substream *substream);
  80 };
  81
  82 /*
  83  *
  84  */
  85
  86 #if defined(CONFIG_SND_DYNAMIC_MINORS)
  87 #define SNDRV_PCM_DEVICES       (SNDRV_OS_MINORS-2)
  88 #else
  89 #define SNDRV_PCM_DEVICES       8
  90 #endif
  91
  92 #define SNDRV_PCM_IOCTL1_RESET          0
  93 /* 1 is absent slot. */
  94 #define SNDRV_PCM_IOCTL1_CHANNEL_INFO   2
  95 /* 3 is absent slot. */
  96 #define SNDRV_PCM_IOCTL1_FIFO_SIZE      4
  97
  98 #define SNDRV_PCM_TRIGGER_STOP          0
  99 #define SNDRV_PCM_TRIGGER_START         1
 100 #define SNDRV_PCM_TRIGGER_PAUSE_PUSH    3
 101 #define SNDRV_PCM_TRIGGER_PAUSE_RELEASE 4
 102 #define SNDRV_PCM_TRIGGER_SUSPEND       5
 103 #define SNDRV_PCM_TRIGGER_RESUME        6
 104 #define SNDRV_PCM_TRIGGER_DRAIN         7
 105
 106 #define SNDRV_PCM_POS_XRUN              ((snd_pcm_uframes_t)-1)
 107
 108 /* If you change this don't forget to change rates[] table in pcm_native.c */
 109 #define SNDRV_PCM_RATE_5512             (1<<0)          /* 5512Hz */
 110 #define SNDRV_PCM_RATE_8000             (1<<1)          /* 8000Hz */
 111 #define SNDRV_PCM_RATE_11025            (1<<2)          /* 11025Hz */
 112 #define SNDRV_PCM_RATE_16000            (1<<3)          /* 16000Hz */
 113 #define SNDRV_PCM_RATE_22050            (1<<4)          /* 22050Hz */
 114 #define SNDRV_PCM_RATE_32000            (1<<5)          /* 32000Hz */
 115 #define SNDRV_PCM_RATE_44100            (1<<6)          /* 44100Hz */
 116 #define SNDRV_PCM_RATE_48000            (1<<7)          /* 48000Hz */
 117 #define SNDRV_PCM_RATE_64000            (1<<8)          /* 64000Hz */
 118 #define SNDRV_PCM_RATE_88200            (1<<9)          /* 88200Hz */
 119 #define SNDRV_PCM_RATE_96000            (1<<10)         /* 96000Hz */
 120 #define SNDRV_PCM_RATE_176400           (1<<11)         /* 176400Hz */
 121 #define SNDRV_PCM_RATE_192000           (1<<12)         /* 192000Hz */
 122 #define SNDRV_PCM_RATE_352800           (1<<13)         /* 352800Hz */
 123 #define SNDRV_PCM_RATE_384000           (1<<14)         /* 384000Hz */
 124
 125 #define SNDRV_PCM_RATE_CONTINUOUS       (1<<30)         /* continuous range */
 126 #define SNDRV_PCM_RATE_KNOT             (1<<31)         /* supports more non-continuos rates */
 127
 128 #define SNDRV_PCM_RATE_8000_44100       (SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_11025|\
 129                                          SNDRV_PCM_RATE_16000|SNDRV_PCM_RATE_22050|\
 130                                          SNDRV_PCM_RATE_32000|SNDRV_PCM_RATE_44100)
 131 #define SNDRV_PCM_RATE_8000_48000       (SNDRV_PCM_RATE_8000_44100|SNDRV_PCM_RATE_48000)
 132 #define SNDRV_PCM_RATE_8000_96000       (SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_64000|\
 133                                          SNDRV_PCM_RATE_88200|SNDRV_PCM_RATE_96000)
 134 #define SNDRV_PCM_RATE_8000_192000      (SNDRV_PCM_RATE_8000_96000|SNDRV_PCM_RATE_176400|\
 135                                          SNDRV_PCM_RATE_192000)
 136 #define SNDRV_PCM_RATE_8000_384000      (SNDRV_PCM_RATE_8000_192000|\
 137                                          SNDRV_PCM_RATE_352800|\
 138                                          SNDRV_PCM_RATE_384000)
 139 #define _SNDRV_PCM_FMTBIT(fmt)          (1ULL << (__force int)SNDRV_PCM_FORMAT_##fmt)
 140 #define SNDRV_PCM_FMTBIT_S8             _SNDRV_PCM_FMTBIT(S8)
 141 #define SNDRV_PCM_FMTBIT_U8             _SNDRV_PCM_FMTBIT(U8)
 142 #define SNDRV_PCM_FMTBIT_S16_LE         _SNDRV_PCM_FMTBIT(S16_LE)
 143 #define SNDRV_PCM_FMTBIT_S16_BE         _SNDRV_PCM_FMTBIT(S16_BE)
 144 #define SNDRV_PCM_FMTBIT_U16_LE         _SNDRV_PCM_FMTBIT(U16_LE)
 145 #define SNDRV_PCM_FMTBIT_U16_BE         _SNDRV_PCM_FMTBIT(U16_BE)
 146 #define SNDRV_PCM_FMTBIT_S24_LE         _SNDRV_PCM_FMTBIT(S24_LE)
 147 #define SNDRV_PCM_FMTBIT_S24_BE         _SNDRV_PCM_FMTBIT(S24_BE)
 148 #define SNDRV_PCM_FMTBIT_U24_LE         _SNDRV_PCM_FMTBIT(U24_LE)
 149 #define SNDRV_PCM_FMTBIT_U24_BE         _SNDRV_PCM_FMTBIT(U24_BE)
 150 #define SNDRV_PCM_FMTBIT_S32_LE         _SNDRV_PCM_FMTBIT(S32_LE)
 151 #define SNDRV_PCM_FMTBIT_S32_BE         _SNDRV_PCM_FMTBIT(S32_BE)
 152 #define SNDRV_PCM_FMTBIT_U32_LE         _SNDRV_PCM_FMTBIT(U32_LE)
 153 #define SNDRV_PCM_FMTBIT_U32_BE         _SNDRV_PCM_FMTBIT(U32_BE)
 154 #define SNDRV_PCM_FMTBIT_FLOAT_LE       _SNDRV_PCM_FMTBIT(FLOAT_LE)
 155 #define SNDRV_PCM_FMTBIT_FLOAT_BE       _SNDRV_PCM_FMTBIT(FLOAT_BE)
 156 #define SNDRV_PCM_FMTBIT_FLOAT64_LE     _SNDRV_PCM_FMTBIT(FLOAT64_LE)
 157 #define SNDRV_PCM_FMTBIT_FLOAT64_BE     _SNDRV_PCM_FMTBIT(FLOAT64_BE)
 158 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_LE)
 159 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_BE)
 160 #define SNDRV_PCM_FMTBIT_MU_LAW         _SNDRV_PCM_FMTBIT(MU_LAW)
 161 #define SNDRV_PCM_FMTBIT_A_LAW          _SNDRV_PCM_FMTBIT(A_LAW)
 162 #define SNDRV_PCM_FMTBIT_IMA_ADPCM      _SNDRV_PCM_FMTBIT(IMA_ADPCM)
 163 #define SNDRV_PCM_FMTBIT_MPEG           _SNDRV_PCM_FMTBIT(MPEG)
 164 #define SNDRV_PCM_FMTBIT_GSM            _SNDRV_PCM_FMTBIT(GSM)
 165 #define SNDRV_PCM_FMTBIT_S20_LE _SNDRV_PCM_FMTBIT(S20_LE)
 166 #define SNDRV_PCM_FMTBIT_U20_LE _SNDRV_PCM_FMTBIT(U20_LE)
 167 #define SNDRV_PCM_FMTBIT_S20_BE _SNDRV_PCM_FMTBIT(S20_BE)
 168 #define SNDRV_PCM_FMTBIT_U20_BE _SNDRV_PCM_FMTBIT(U20_BE)
 169 #define SNDRV_PCM_FMTBIT_SPECIAL        _SNDRV_PCM_FMTBIT(SPECIAL)
 170 #define SNDRV_PCM_FMTBIT_S24_3LE        _SNDRV_PCM_FMTBIT(S24_3LE)
 171 #define SNDRV_PCM_FMTBIT_U24_3LE        _SNDRV_PCM_FMTBIT(U24_3LE)
 172 #define SNDRV_PCM_FMTBIT_S24_3BE        _SNDRV_PCM_FMTBIT(S24_3BE)
 173 #define SNDRV_PCM_FMTBIT_U24_3BE        _SNDRV_PCM_FMTBIT(U24_3BE)
 174 #define SNDRV_PCM_FMTBIT_S20_3LE        _SNDRV_PCM_FMTBIT(S20_3LE)
 175 #define SNDRV_PCM_FMTBIT_U20_3LE        _SNDRV_PCM_FMTBIT(U20_3LE)
 176 #define SNDRV_PCM_FMTBIT_S20_3BE        _SNDRV_PCM_FMTBIT(S20_3BE)
 177 #define SNDRV_PCM_FMTBIT_U20_3BE        _SNDRV_PCM_FMTBIT(U20_3BE)
 178 #define SNDRV_PCM_FMTBIT_S18_3LE        _SNDRV_PCM_FMTBIT(S18_3LE)
 179 #define SNDRV_PCM_FMTBIT_U18_3LE        _SNDRV_PCM_FMTBIT(U18_3LE)
 180 #define SNDRV_PCM_FMTBIT_S18_3BE        _SNDRV_PCM_FMTBIT(S18_3BE)
 181 #define SNDRV_PCM_FMTBIT_U18_3BE        _SNDRV_PCM_FMTBIT(U18_3BE)
 182 #define SNDRV_PCM_FMTBIT_G723_24        _SNDRV_PCM_FMTBIT(G723_24)
 183 #define SNDRV_PCM_FMTBIT_G723_24_1B     _SNDRV_PCM_FMTBIT(G723_24_1B)
 184 #define SNDRV_PCM_FMTBIT_G723_40        _SNDRV_PCM_FMTBIT(G723_40)
 185 #define SNDRV_PCM_FMTBIT_G723_40_1B     _SNDRV_PCM_FMTBIT(G723_40_1B)
 186 #define SNDRV_PCM_FMTBIT_DSD_U8         _SNDRV_PCM_FMTBIT(DSD_U8)
 187 #define SNDRV_PCM_FMTBIT_DSD_U16_LE     _SNDRV_PCM_FMTBIT(DSD_U16_LE)
 188 #define SNDRV_PCM_FMTBIT_DSD_U32_LE     _SNDRV_PCM_FMTBIT(DSD_U32_LE)
 189 #define SNDRV_PCM_FMTBIT_DSD_U16_BE     _SNDRV_PCM_FMTBIT(DSD_U16_BE)
 190 #define SNDRV_PCM_FMTBIT_DSD_U32_BE     _SNDRV_PCM_FMTBIT(DSD_U32_BE)
 191
 192 #ifdef SNDRV_LITTLE_ENDIAN
 193 #define SNDRV_PCM_FMTBIT_S16            SNDRV_PCM_FMTBIT_S16_LE
 194 #define SNDRV_PCM_FMTBIT_U16            SNDRV_PCM_FMTBIT_U16_LE
 195 #define SNDRV_PCM_FMTBIT_S24            SNDRV_PCM_FMTBIT_S24_LE
 196 #define SNDRV_PCM_FMTBIT_U24            SNDRV_PCM_FMTBIT_U24_LE
 197 #define SNDRV_PCM_FMTBIT_S32            SNDRV_PCM_FMTBIT_S32_LE
 198 #define SNDRV_PCM_FMTBIT_U32            SNDRV_PCM_FMTBIT_U32_LE
 199 #define SNDRV_PCM_FMTBIT_FLOAT          SNDRV_PCM_FMTBIT_FLOAT_LE
 200 #define SNDRV_PCM_FMTBIT_FLOAT64        SNDRV_PCM_FMTBIT_FLOAT64_LE
 201 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE
 202 #define SNDRV_PCM_FMTBIT_S20            SNDRV_PCM_FMTBIT_S20_LE
 203 #define SNDRV_PCM_FMTBIT_U20            SNDRV_PCM_FMTBIT_U20_LE
 204 #endif
 205 #ifdef SNDRV_BIG_ENDIAN
 206 #define SNDRV_PCM_FMTBIT_S16            SNDRV_PCM_FMTBIT_S16_BE
 207 #define SNDRV_PCM_FMTBIT_U16            SNDRV_PCM_FMTBIT_U16_BE
 208 #define SNDRV_PCM_FMTBIT_S24            SNDRV_PCM_FMTBIT_S24_BE
 209 #define SNDRV_PCM_FMTBIT_U24            SNDRV_PCM_FMTBIT_U24_BE
 210 #define SNDRV_PCM_FMTBIT_S32            SNDRV_PCM_FMTBIT_S32_BE
 211 #define SNDRV_PCM_FMTBIT_U32            SNDRV_PCM_FMTBIT_U32_BE
 212 #define SNDRV_PCM_FMTBIT_FLOAT          SNDRV_PCM_FMTBIT_FLOAT_BE
 213 #define SNDRV_PCM_FMTBIT_FLOAT64        SNDRV_PCM_FMTBIT_FLOAT64_BE
 214 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE
 215 #define SNDRV_PCM_FMTBIT_S20            SNDRV_PCM_FMTBIT_S20_BE
 216 #define SNDRV_PCM_FMTBIT_U20            SNDRV_PCM_FMTBIT_U20_BE
 217 #endif
 218
 219 struct snd_pcm_file {
 220         struct snd_pcm_substream *substream;
 221         int no_compat_mmap;
 222         unsigned int user_pversion;     /* supported protocol version */
 223 };
 224
 225 struct snd_pcm_hw_rule;
 226 typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params,
 227                                       struct snd_pcm_hw_rule *rule);
 228
 229 struct snd_pcm_hw_rule {
 230         unsigned int cond;
 231         int var;
 232         int deps[4];
 233
 234         snd_pcm_hw_rule_func_t func;
 235         void *private;
 236 };
 237
 238 struct snd_pcm_hw_constraints {
 239         struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK -
 240                          SNDRV_PCM_HW_PARAM_FIRST_MASK + 1];
 241         struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL -
 242                              SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
 243         unsigned int rules_num;
 244         unsigned int rules_all;
 245         struct snd_pcm_hw_rule *rules;
 246 };
 247
 248 static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs,
 249                                             snd_pcm_hw_param_t var)
 250 {
 251         return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 252 }
 253
 254 static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs,
 255                                                     snd_pcm_hw_param_t var)
 256 {
 257         return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 258 }
 259
 260 struct snd_ratnum {
 261         unsigned int num;
 262         unsigned int den_min, den_max, den_step;
 263 };
 264
 265 struct snd_ratden {
 266         unsigned int num_min, num_max, num_step;
 267         unsigned int den;
 268 };
 269
 270 struct snd_pcm_hw_constraint_ratnums {
 271         int nrats;
 272         const struct snd_ratnum *rats;
 273 };
 274
 275 struct snd_pcm_hw_constraint_ratdens {
 276         int nrats;
 277         const struct snd_ratden *rats;
 278 };
 279
 280 struct snd_pcm_hw_constraint_list {
 281         const unsigned int *list;
 282         unsigned int count;
 283         unsigned int mask;
 284 };
 285
 286 struct snd_pcm_hw_constraint_ranges {
 287         unsigned int count;
 288         const struct snd_interval *ranges;
 289         unsigned int mask;
 290 };
 291
 292 /*
 293  * userspace-provided audio timestamp config to kernel,
 294  * structure is for internal use only and filled with dedicated unpack routine
 295  */
 296 struct snd_pcm_audio_tstamp_config {
 297         /* 5 of max 16 bits used */
 298         u32 type_requested:4;
 299         u32 report_delay:1; /* add total delay to A/D or D/A */
 300 };
 301
 302 static inline void snd_pcm_unpack_audio_tstamp_config(__u32 data,
 303                                                 struct snd_pcm_audio_tstamp_config *config)
 304 {
 305         config->type_requested = data & 0xF;
 306         config->report_delay = (data >> 4) & 1;
 307 }
 308
 309 /*
 310  * kernel-provided audio timestamp report to user-space
 311  * structure is for internal use only and read by dedicated pack routine
 312  */
 313 struct snd_pcm_audio_tstamp_report {
 314         /* 6 of max 16 bits used for bit-fields */
 315
 316         /* for backwards compatibility */
 317         u32 valid:1;
 318
 319         /* actual type if hardware could not support requested timestamp */
 320         u32 actual_type:4;
 321
 322         /* accuracy represented in ns units */
 323         u32 accuracy_report:1; /* 0 if accuracy unknown, 1 if accuracy field is valid */
 324         u32 accuracy; /* up to 4.29s, will be packed in separate field  */
 325 };
 326
 327 static inline void snd_pcm_pack_audio_tstamp_report(__u32 *data, __u32 *accuracy,
 328                                                 const struct snd_pcm_audio_tstamp_report *report)
 329 {
 330         u32 tmp;
 331
 332         tmp = report->accuracy_report;
 333         tmp <<= 4;
 334         tmp |= report->actual_type;
 335         tmp <<= 1;
 336         tmp |= report->valid;
 337
 338         *data &= 0xffff; /* zero-clear MSBs */
 339         *data |= (tmp << 16);
 340         *accuracy = report->accuracy;
 341 }
 342
 343
 344 struct snd_pcm_runtime {
 345         /* -- Status -- */
 346         struct snd_pcm_substream *trigger_master;
 347         struct timespec64 trigger_tstamp;       /* trigger timestamp */
 348         bool trigger_tstamp_latched;     /* trigger timestamp latched in low-level driver/hardware */
 349         int overrange;
 350         snd_pcm_uframes_t avail_max;
 351         snd_pcm_uframes_t hw_ptr_base;  /* Position at buffer restart */
 352         snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time */
 353         unsigned long hw_ptr_jiffies;   /* Time when hw_ptr is updated */
 354         unsigned long hw_ptr_buffer_jiffies; /* buffer time in jiffies */
 355         snd_pcm_sframes_t delay;        /* extra delay; typically FIFO size */
 356         u64 hw_ptr_wrap;                /* offset for hw_ptr due to boundary wrap-around */
 357
 358         /* -- HW params -- */
 359         snd_pcm_access_t access;        /* access mode */
 360         snd_pcm_format_t format;        /* SNDRV_PCM_FORMAT_* */
 361         snd_pcm_subformat_t subformat;  /* subformat */
 362         unsigned int rate;              /* rate in Hz */
 363         unsigned int channels;          /* channels */
 364         snd_pcm_uframes_t period_size;  /* period size */
 365         unsigned int periods;           /* periods */
 366         snd_pcm_uframes_t buffer_size;  /* buffer size */
 367         snd_pcm_uframes_t min_align;    /* Min alignment for the format */
 368         size_t byte_align;
 369         unsigned int frame_bits;
 370         unsigned int sample_bits;
 371         unsigned int info;
 372         unsigned int rate_num;
 373         unsigned int rate_den;
 374         unsigned int no_period_wakeup: 1;
 375
 376         /* -- SW params -- */
 377         int tstamp_mode;                /* mmap timestamp is updated */
 378         unsigned int period_step;
 379         snd_pcm_uframes_t start_threshold;
 380         snd_pcm_uframes_t stop_threshold;
 381         snd_pcm_uframes_t silence_threshold; /* Silence filling happens when
 382                                                 noise is nearest than this */
 383         snd_pcm_uframes_t silence_size; /* Silence filling size */
 384         snd_pcm_uframes_t boundary;     /* pointers wrap point */
 385
 386         snd_pcm_uframes_t silence_start; /* starting pointer to silence area */
 387         snd_pcm_uframes_t silence_filled; /* size filled with silence */
 388
 389         union snd_pcm_sync_id sync;     /* hardware synchronization ID */
 390
 391         /* -- mmap -- */
 392         struct snd_pcm_mmap_status *status;
 393         struct snd_pcm_mmap_control *control;
 394
 395         /* -- locking / scheduling -- */
 396         snd_pcm_uframes_t twake;        /* do transfer (!poll) wakeup if non-zero */
 397         wait_queue_head_t sleep;        /* poll sleep */
 398         wait_queue_head_t tsleep;       /* transfer sleep */
 399         struct fasync_struct *fasync;
 400         bool stop_operating;            /* sync_stop will be called */
 401
 402         /* -- private section -- */
 403         void *private_data;
 404         void (*private_free)(struct snd_pcm_runtime *runtime);
 405
 406         /* -- hardware description -- */
 407         struct snd_pcm_hardware hw;
 408         struct snd_pcm_hw_constraints hw_constraints;
 409
 410         /* -- timer -- */
 411         unsigned int timer_resolution;  /* timer resolution */
 412         int tstamp_type;                /* timestamp type */
 413
 414         /* -- DMA -- */
 415         unsigned char *dma_area;        /* DMA area */
 416         dma_addr_t dma_addr;            /* physical bus address (not accessible from main CPU) */
 417         size_t dma_bytes;               /* size of DMA area */
 418
 419         struct snd_dma_buffer *dma_buffer_p;    /* allocated buffer */
 420         unsigned int buffer_changed:1;  /* buffer allocation changed; set only in managed mode */
 421
 422         /* -- audio timestamp config -- */
 423         struct snd_pcm_audio_tstamp_config audio_tstamp_config;
 424         struct snd_pcm_audio_tstamp_report audio_tstamp_report;
 425         struct timespec64 driver_tstamp;
 426
 427 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
 428         /* -- OSS things -- */
 429         struct snd_pcm_oss_runtime oss;
 430 #endif
 431 };
 432
 433 struct snd_pcm_group {          /* keep linked substreams */
 434         spinlock_t lock;
 435         struct mutex mutex;
 436         struct list_head substreams;
 437         refcount_t refs;
 438 };
 439
 440 struct pid;
 441
 442 struct snd_pcm_substream {
 443         struct snd_pcm *pcm;
 444         struct snd_pcm_str *pstr;
 445         void *private_data;             /* copied from pcm->private_data */
 446         int number;
 447         char name[32];                  /* substream name */
 448         int stream;                     /* stream (direction) */
 449         struct pm_qos_request latency_pm_qos_req; /* pm_qos request */
 450         size_t buffer_bytes_max;        /* limit ring buffer size */
 451         struct snd_dma_buffer dma_buffer;
 452         size_t dma_max;
 453         /* -- hardware operations -- */
 454         const struct snd_pcm_ops *ops;
 455         /* -- runtime information -- */
 456         struct snd_pcm_runtime *runtime;
 457         /* -- timer section -- */
 458         struct snd_timer *timer;                /* timer */
 459         unsigned timer_running: 1;      /* time is running */
 460         long wait_time; /* time in ms for R/W to wait for avail */
 461         /* -- next substream -- */
 462         struct snd_pcm_substream *next;
 463         /* -- linked substreams -- */
 464         struct list_head link_list;     /* linked list member */
 465         struct snd_pcm_group self_group;        /* fake group for non linked substream (with substream lock inside) */
 466         struct snd_pcm_group *group;            /* pointer to current group */
 467         /* -- assigned files -- */
 468         int ref_count;
 469         atomic_t mmap_count;
 470         unsigned int f_flags;
 471         void (*pcm_release)(struct snd_pcm_substream *);
 472         struct pid *pid;
 473 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
 474         /* -- OSS things -- */
 475         struct snd_pcm_oss_substream oss;
 476 #endif
 477 #ifdef CONFIG_SND_VERBOSE_PROCFS
 478         struct snd_info_entry *proc_root;
 479 #endif /* CONFIG_SND_VERBOSE_PROCFS */
 480         /* misc flags */
 481         unsigned int hw_opened: 1;
 482         unsigned int managed_buffer_alloc:1;
 483 };
 484
 485 #define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0)
 486
 487
 488 struct snd_pcm_str {
 489         int stream;                             /* stream (direction) */
 490         struct snd_pcm *pcm;
 491         /* -- substreams -- */
 492         unsigned int substream_count;
 493         unsigned int substream_opened;
 494         struct snd_pcm_substream *substream;
 495 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
 496         /* -- OSS things -- */
 497         struct snd_pcm_oss_stream oss;
 498 #endif
 499 #ifdef CONFIG_SND_VERBOSE_PROCFS
 500         struct snd_info_entry *proc_root;
 501 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 502         unsigned int xrun_debug;        /* 0 = disabled, 1 = verbose, 2 = stacktrace */
 503 #endif
 504 #endif
 505         struct snd_kcontrol *chmap_kctl; /* channel-mapping controls */
 506         struct device dev;
 507 };
 508
 509 struct snd_pcm {
 510         struct snd_card *card;
 511         struct list_head list;
 512         int device; /* device number */
 513         unsigned int info_flags;
 514         unsigned short dev_class;
 515         unsigned short dev_subclass;
 516         char id[64];
 517         char name[80];
 518         struct snd_pcm_str streams[2];
 519         struct mutex open_mutex;
 520         wait_queue_head_t open_wait;
 521         void *private_data;
 522         void (*private_free) (struct snd_pcm *pcm);
 523         bool internal; /* pcm is for internal use only */
 524         bool nonatomic; /* whole PCM operations are in non-atomic context */
 525         bool no_device_suspend; /* don't invoke device PM suspend */
 526 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
 527         struct snd_pcm_oss oss;
 528 #endif
 529 };
 530
 531 /*
 532  *  Registering
 533  */
 534
 535 extern const struct file_operations snd_pcm_f_ops[2];
 536
 537 int snd_pcm_new(struct snd_card *card, const char *id, int device,
 538                 int playback_count, int capture_count,
 539                 struct snd_pcm **rpcm);
 540 int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
 541                 int playback_count, int capture_count,
 542                 struct snd_pcm **rpcm);
 543 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
 544
 545 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
 546 struct snd_pcm_notify {
 547         int (*n_register) (struct snd_pcm * pcm);
 548         int (*n_disconnect) (struct snd_pcm * pcm);
 549         int (*n_unregister) (struct snd_pcm * pcm);
 550         struct list_head list;
 551 };
 552 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
 553 #endif
 554
 555 /*
 556  *  Native I/O
 557  */
 558
 559 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
 560 int snd_pcm_info_user(struct snd_pcm_substream *substream,
 561                       struct snd_pcm_info __user *info);
 562 int snd_pcm_status64(struct snd_pcm_substream *substream,
 563                      struct snd_pcm_status64 *status);
 564 int snd_pcm_start(struct snd_pcm_substream *substream);
 565 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t status);
 566 int snd_pcm_drain_done(struct snd_pcm_substream *substream);
 567 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream);
 568 #ifdef CONFIG_PM
 569 int snd_pcm_suspend_all(struct snd_pcm *pcm);
 570 #else
 571 static inline int snd_pcm_suspend_all(struct snd_pcm *pcm)
 572 {
 573         return 0;
 574 }
 575 #endif
 576 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
 577 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
 578                            struct snd_pcm_substream **rsubstream);
 579 void snd_pcm_release_substream(struct snd_pcm_substream *substream);
 580 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
 581                              struct snd_pcm_substream **rsubstream);
 582 void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
 583 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
 584
 585
 586 #ifdef CONFIG_SND_DEBUG
 587 void snd_pcm_debug_name(struct snd_pcm_substream *substream,
 588                            char *name, size_t len);
 589 #else
 590 static inline void
 591 snd_pcm_debug_name(struct snd_pcm_substream *substream, char *buf, size_t size)
 592 {
 593         *buf = 0;
 594 }
 595 #endif
 596
 597 /*
 598  *  PCM library
 599  */
 600
 601 /**
 602  * snd_pcm_stream_linked - Check whether the substream is linked with others
 603  * @substream: substream to check
 604  *
 605  * Returns true if the given substream is being linked with others.
 606  */
 607 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
 608 {
 609         return substream->group != &substream->self_group;
 610 }
 611
 612 void snd_pcm_stream_lock(struct snd_pcm_substream *substream);
 613 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream);
 614 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream);
 615 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream);
 616 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream);
 617
 618 /**
 619  * snd_pcm_stream_lock_irqsave - Lock the PCM stream
 620  * @substream: PCM substream
 621  * @flags: irq flags
 622  *
 623  * This locks the PCM stream like snd_pcm_stream_lock() but with the local
 624  * IRQ (only when nonatomic is false).  In nonatomic case, this is identical
 625  * as snd_pcm_stream_lock().
 626  */
 627 #define snd_pcm_stream_lock_irqsave(substream, flags)            \
 628         do {                                                     \
 629                 typecheck(unsigned long, flags);                 \
 630                 flags = _snd_pcm_stream_lock_irqsave(substream); \
 631         } while (0)
 632 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
 633                                       unsigned long flags);
 634
 635 /**
 636  * snd_pcm_group_for_each_entry - iterate over the linked substreams
 637  * @s: the iterator
 638  * @substream: the substream
 639  *
 640  * Iterate over the all linked substreams to the given @substream.
 641  * When @substream isn't linked with any others, this gives returns @substream
 642  * itself once.
 643  */
 644 #define snd_pcm_group_for_each_entry(s, substream) \
 645         list_for_each_entry(s, &substream->group->substreams, link_list)
 646
 647 /**
 648  * snd_pcm_running - Check whether the substream is in a running state
 649  * @substream: substream to check
 650  *
 651  * Returns true if the given substream is in the state RUNNING, or in the
 652  * state DRAINING for playback.
 653  */
 654 static inline int snd_pcm_running(struct snd_pcm_substream *substream)
 655 {
 656         return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
 657                 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
 658                  substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
 659 }
 660
 661 /**
 662  * bytes_to_samples - Unit conversion of the size from bytes to samples
 663  * @runtime: PCM runtime instance
 664  * @size: size in bytes
 665  */
 666 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
 667 {
 668         return size * 8 / runtime->sample_bits;
 669 }
 670
 671 /**
 672  * bytes_to_frames - Unit conversion of the size from bytes to frames
 673  * @runtime: PCM runtime instance
 674  * @size: size in bytes
 675  */
 676 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
 677 {
 678         return size * 8 / runtime->frame_bits;
 679 }
 680
 681 /**
 682  * samples_to_bytes - Unit conversion of the size from samples to bytes
 683  * @runtime: PCM runtime instance
 684  * @size: size in samples
 685  */
 686 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
 687 {
 688         return size * runtime->sample_bits / 8;
 689 }
 690
 691 /**
 692  * frames_to_bytes - Unit conversion of the size from frames to bytes
 693  * @runtime: PCM runtime instance
 694  * @size: size in frames
 695  */
 696 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
 697 {
 698         return size * runtime->frame_bits / 8;
 699 }
 700
 701 /**
 702  * frame_aligned - Check whether the byte size is aligned to frames
 703  * @runtime: PCM runtime instance
 704  * @bytes: size in bytes
 705  */
 706 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
 707 {
 708         return bytes % runtime->byte_align == 0;
 709 }
 710
 711 /**
 712  * snd_pcm_lib_buffer_bytes - Get the buffer size of the current PCM in bytes
 713  * @substream: PCM substream
 714  */
 715 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
 716 {
 717         struct snd_pcm_runtime *runtime = substream->runtime;
 718         return frames_to_bytes(runtime, runtime->buffer_size);
 719 }
 720
 721 /**
 722  * snd_pcm_lib_period_bytes - Get the period size of the current PCM in bytes
 723  * @substream: PCM substream
 724  */
 725 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
 726 {
 727         struct snd_pcm_runtime *runtime = substream->runtime;
 728         return frames_to_bytes(runtime, runtime->period_size);
 729 }
 730
 731 /**
 732  * snd_pcm_playback_avail - Get the available (writable) space for playback
 733  * @runtime: PCM runtime instance
 734  *
 735  * Result is between 0 ... (boundary - 1)
 736  */
 737 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
 738 {
 739         snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
 740         if (avail < 0)
 741                 avail += runtime->boundary;
 742         else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
 743                 avail -= runtime->boundary;
 744         return avail;
 745 }
 746
 747 /**
 748  * snd_pcm_capture_avail - Get the available (readable) space for capture
 749  * @runtime: PCM runtime instance
 750  *
 751  * Result is between 0 ... (boundary - 1)
 752  */
 753 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
 754 {
 755         snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
 756         if (avail < 0)
 757                 avail += runtime->boundary;
 758         return avail;
 759 }
 760
 761 /**
 762  * snd_pcm_playback_hw_avail - Get the queued space for playback
 763  * @runtime: PCM runtime instance
 764  */
 765 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
 766 {
 767         return runtime->buffer_size - snd_pcm_playback_avail(runtime);
 768 }
 769
 770 /**
 771  * snd_pcm_capture_hw_avail - Get the free space for capture
 772  * @runtime: PCM runtime instance
 773  */
 774 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
 775 {
 776         return runtime->buffer_size - snd_pcm_capture_avail(runtime);
 777 }
 778
 779 /**
 780  * snd_pcm_playback_ready - check whether the playback buffer is available
 781  * @substream: the pcm substream instance
 782  *
 783  * Checks whether enough free space is available on the playback buffer.
 784  *
 785  * Return: Non-zero if available, or zero if not.
 786  */
 787 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
 788 {
 789         struct snd_pcm_runtime *runtime = substream->runtime;
 790         return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
 791 }
 792
 793 /**
 794  * snd_pcm_capture_ready - check whether the capture buffer is available
 795  * @substream: the pcm substream instance
 796  *
 797  * Checks whether enough capture data is available on the capture buffer.
 798  *
 799  * Return: Non-zero if available, or zero if not.
 800  */
 801 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
 802 {
 803         struct snd_pcm_runtime *runtime = substream->runtime;
 804         return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
 805 }
 806
 807 /**
 808  * snd_pcm_playback_data - check whether any data exists on the playback buffer
 809  * @substream: the pcm substream instance
 810  *
 811  * Checks whether any data exists on the playback buffer.
 812  *
 813  * Return: Non-zero if any data exists, or zero if not. If stop_threshold
 814  * is bigger or equal to boundary, then this function returns always non-zero.
 815  */
 816 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
 817 {
 818         struct snd_pcm_runtime *runtime = substream->runtime;
 819
 820         if (runtime->stop_threshold >= runtime->boundary)
 821                 return 1;
 822         return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
 823 }
 824
 825 /**
 826  * snd_pcm_playback_empty - check whether the playback buffer is empty
 827  * @substream: the pcm substream instance
 828  *
 829  * Checks whether the playback buffer is empty.
 830  *
 831  * Return: Non-zero if empty, or zero if not.
 832  */
 833 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
 834 {
 835         struct snd_pcm_runtime *runtime = substream->runtime;
 836         return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
 837 }
 838
 839 /**
 840  * snd_pcm_capture_empty - check whether the capture buffer is empty
 841  * @substream: the pcm substream instance
 842  *
 843  * Checks whether the capture buffer is empty.
 844  *
 845  * Return: Non-zero if empty, or zero if not.
 846  */
 847 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
 848 {
 849         struct snd_pcm_runtime *runtime = substream->runtime;
 850         return snd_pcm_capture_avail(runtime) == 0;
 851 }
 852
 853 /**
 854  * snd_pcm_trigger_done - Mark the master substream
 855  * @substream: the pcm substream instance
 856  * @master: the linked master substream
 857  *
 858  * When multiple substreams of the same card are linked and the hardware
 859  * supports the single-shot operation, the driver calls this in the loop
 860  * in snd_pcm_group_for_each_entry() for marking the substream as "done".
 861  * Then most of trigger operations are performed only to the given master
 862  * substream.
 863  *
 864  * The trigger_master mark is cleared at timestamp updates at the end
 865  * of trigger operations.
 866  */
 867 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream,
 868                                         struct snd_pcm_substream *master)
 869 {
 870         substream->runtime->trigger_master = master;
 871 }
 872
 873 static inline int hw_is_mask(int var)
 874 {
 875         return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
 876                 var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
 877 }
 878
 879 static inline int hw_is_interval(int var)
 880 {
 881         return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
 882                 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
 883 }
 884
 885 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
 886                                      snd_pcm_hw_param_t var)
 887 {
 888         return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 889 }
 890
 891 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
 892                                              snd_pcm_hw_param_t var)
 893 {
 894         return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 895 }
 896
 897 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
 898                                              snd_pcm_hw_param_t var)
 899 {
 900         return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
 901 }
 902
 903 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
 904                                                      snd_pcm_hw_param_t var)
 905 {
 906         return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
 907 }
 908
 909 /**
 910  * params_channels - Get the number of channels from the hw params
 911  * @p: hw params
 912  */
 913 static inline unsigned int params_channels(const struct snd_pcm_hw_params *p)
 914 {
 915         return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_CHANNELS)->min;
 916 }
 917
 918 /**
 919  * params_rate - Get the sample rate from the hw params
 920  * @p: hw params
 921  */
 922 static inline unsigned int params_rate(const struct snd_pcm_hw_params *p)
 923 {
 924         return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_RATE)->min;
 925 }
 926
 927 /**
 928  * params_period_size - Get the period size (in frames) from the hw params
 929  * @p: hw params
 930  */
 931 static inline unsigned int params_period_size(const struct snd_pcm_hw_params *p)
 932 {
 933         return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min;
 934 }
 935
 936 /**
 937  * params_periods - Get the number of periods from the hw params
 938  * @p: hw params
 939  */
 940 static inline unsigned int params_periods(const struct snd_pcm_hw_params *p)
 941 {
 942         return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIODS)->min;
 943 }
 944
 945 /**
 946  * params_buffer_size - Get the buffer size (in frames) from the hw params
 947  * @p: hw params
 948  */
 949 static inline unsigned int params_buffer_size(const struct snd_pcm_hw_params *p)
 950 {
 951         return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min;
 952 }
 953
 954 /**
 955  * params_buffer_bytes - Get the buffer size (in bytes) from the hw params
 956  * @p: hw params
 957  */
 958 static inline unsigned int params_buffer_bytes(const struct snd_pcm_hw_params *p)
 959 {
 960         return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min;
 961 }
 962
 963 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
 964 int snd_interval_list(struct snd_interval *i, unsigned int count,
 965                       const unsigned int *list, unsigned int mask);
 966 int snd_interval_ranges(struct snd_interval *i, unsigned int count,
 967                         const struct snd_interval *list, unsigned int mask);
 968 int snd_interval_ratnum(struct snd_interval *i,
 969                         unsigned int rats_count, const struct snd_ratnum *rats,
 970                         unsigned int *nump, unsigned int *denp);
 971
 972 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
 973 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
 974
 975 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
 976
 977 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 978                                  u_int64_t mask);
 979 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 980                                  unsigned int min, unsigned int max);
 981 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
 982 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
 983                                unsigned int cond,
 984                                snd_pcm_hw_param_t var,
 985                                const struct snd_pcm_hw_constraint_list *l);
 986 int snd_pcm_hw_constraint_ranges(struct snd_pcm_runtime *runtime,
 987                                  unsigned int cond,
 988                                  snd_pcm_hw_param_t var,
 989                                  const struct snd_pcm_hw_constraint_ranges *r);
 990 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
 991                                   unsigned int cond,
 992                                   snd_pcm_hw_param_t var,
 993                                   const struct snd_pcm_hw_constraint_ratnums *r);
 994 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
 995                                   unsigned int cond,
 996                                   snd_pcm_hw_param_t var,
 997                                   const struct snd_pcm_hw_constraint_ratdens *r);
 998 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
 999                                  unsigned int cond,
1000                                  unsigned int width,
1001                                  unsigned int msbits);
1002 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1003                                unsigned int cond,
1004                                snd_pcm_hw_param_t var,
1005                                unsigned long step);
1006 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1007                                unsigned int cond,
1008                                snd_pcm_hw_param_t var);
1009 int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
1010                                unsigned int base_rate);
1011 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
1012                         unsigned int cond,
1013                         int var,
1014                         snd_pcm_hw_rule_func_t func, void *private,
1015                         int dep, ...);
1016
1017 /**
1018  * snd_pcm_hw_constraint_single() - Constrain parameter to a single value
1019  * @runtime: PCM runtime instance
1020  * @var: The hw_params variable to constrain
1021  * @val: The value to constrain to
1022  *
1023  * Return: Positive if the value is changed, zero if it's not changed, or a
1024  * negative error code.
1025  */
1026 static inline int snd_pcm_hw_constraint_single(
1027         struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1028         unsigned int val)
1029 {
1030         return snd_pcm_hw_constraint_minmax(runtime, var, val, val);
1031 }
1032
1033 int snd_pcm_format_signed(snd_pcm_format_t format);
1034 int snd_pcm_format_unsigned(snd_pcm_format_t format);
1035 int snd_pcm_format_linear(snd_pcm_format_t format);
1036 int snd_pcm_format_little_endian(snd_pcm_format_t format);
1037 int snd_pcm_format_big_endian(snd_pcm_format_t format);
1038 #if 0 /* just for kernel-doc */
1039 /**
1040  * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
1041  * @format: the format to check
1042  *
1043  * Return: 1 if the given PCM format is CPU-endian, 0 if
1044  * opposite, or a negative error code if endian not specified.
1045  */
1046 int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
1047 #endif /* DocBook */
1048 #ifdef SNDRV_LITTLE_ENDIAN
1049 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
1050 #else
1051 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
1052 #endif
1053 int snd_pcm_format_width(snd_pcm_format_t format);                      /* in bits */
1054 int snd_pcm_format_physical_width(snd_pcm_format_t format);             /* in bits */
1055 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
1056 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
1057 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
1058
1059 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction,
1060                      const struct snd_pcm_ops *ops);
1061 void snd_pcm_set_sync(struct snd_pcm_substream *substream);
1062 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1063                       unsigned int cmd, void *arg);
1064 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
1065 snd_pcm_sframes_t __snd_pcm_lib_xfer(struct snd_pcm_substream *substream,
1066                                      void *buf, bool interleaved,
1067                                      snd_pcm_uframes_t frames, bool in_kernel);
1068
1069 static inline snd_pcm_sframes_t
1070 snd_pcm_lib_write(struct snd_pcm_substream *substream,
1071                   const void __user *buf, snd_pcm_uframes_t frames)
1072 {
1073         return __snd_pcm_lib_xfer(substream, (void __force *)buf, true, frames, false);
1074 }
1075
1076 static inline snd_pcm_sframes_t
1077 snd_pcm_lib_read(struct snd_pcm_substream *substream,
1078                  void __user *buf, snd_pcm_uframes_t frames)
1079 {
1080         return __snd_pcm_lib_xfer(substream, (void __force *)buf, true, frames, false);
1081 }
1082
1083 static inline snd_pcm_sframes_t
1084 snd_pcm_lib_writev(struct snd_pcm_substream *substream,
1085                    void __user **bufs, snd_pcm_uframes_t frames)
1086 {
1087         return __snd_pcm_lib_xfer(substream, (void *)bufs, false, frames, false);
1088 }
1089
1090 static inline snd_pcm_sframes_t
1091 snd_pcm_lib_readv(struct snd_pcm_substream *substream,
1092                   void __user **bufs, snd_pcm_uframes_t frames)
1093 {
1094         return __snd_pcm_lib_xfer(substream, (void *)bufs, false, frames, false);
1095 }
1096
1097 static inline snd_pcm_sframes_t
1098 snd_pcm_kernel_write(struct snd_pcm_substream *substream,
1099                      const void *buf, snd_pcm_uframes_t frames)
1100 {
1101         return __snd_pcm_lib_xfer(substream, (void *)buf, true, frames, true);
1102 }
1103
1104 static inline snd_pcm_sframes_t
1105 snd_pcm_kernel_read(struct snd_pcm_substream *substream,
1106                     void *buf, snd_pcm_uframes_t frames)
1107 {
1108         return __snd_pcm_lib_xfer(substream, buf, true, frames, true);
1109 }
1110
1111 static inline snd_pcm_sframes_t
1112 snd_pcm_kernel_writev(struct snd_pcm_substream *substream,
1113                       void **bufs, snd_pcm_uframes_t frames)
1114 {
1115         return __snd_pcm_lib_xfer(substream, bufs, false, frames, true);
1116 }
1117
1118 static inline snd_pcm_sframes_t
1119 snd_pcm_kernel_readv(struct snd_pcm_substream *substream,
1120                      void **bufs, snd_pcm_uframes_t frames)
1121 {
1122         return __snd_pcm_lib_xfer(substream, bufs, false, frames, true);
1123 }
1124
1125 int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime);
1126 unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate);
1127 unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit);
1128 unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a,
1129                                          unsigned int rates_b);
1130 unsigned int snd_pcm_rate_range_to_bits(unsigned int rate_min,
1131                                         unsigned int rate_max);
1132
1133 /**
1134  * snd_pcm_set_runtime_buffer - Set the PCM runtime buffer
1135  * @substream: PCM substream to set
1136  * @bufp: the buffer information, NULL to clear
1137  *
1138  * Copy the buffer information to runtime->dma_buffer when @bufp is non-NULL.
1139  * Otherwise it clears the current buffer information.
1140  */
1141 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
1142                                               struct snd_dma_buffer *bufp)
1143 {
1144         struct snd_pcm_runtime *runtime = substream->runtime;
1145         if (bufp) {
1146                 runtime->dma_buffer_p = bufp;
1147                 runtime->dma_area = bufp->area;
1148                 runtime->dma_addr = bufp->addr;
1149                 runtime->dma_bytes = bufp->bytes;
1150         } else {
1151                 runtime->dma_buffer_p = NULL;
1152                 runtime->dma_area = NULL;
1153                 runtime->dma_addr = 0;
1154                 runtime->dma_bytes = 0;
1155         }
1156 }
1157
1158 /**
1159  * snd_pcm_gettime - Fill the timespec64 depending on the timestamp mode
1160  * @runtime: PCM runtime instance
1161  * @tv: timespec64 to fill
1162  */
1163 static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime,
1164                                    struct timespec64 *tv)
1165 {
1166         switch (runtime->tstamp_type) {
1167         case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC:
1168                 ktime_get_ts64(tv);
1169                 break;
1170         case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC_RAW:
1171                 ktime_get_raw_ts64(tv);
1172                 break;
1173         default:
1174                 ktime_get_real_ts64(tv);
1175                 break;
1176         }
1177 }
1178
1179 /*
1180  *  Memory
1181  */
1182
1183 void snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
1184 void snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
1185 void snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
1186                                   int type, struct device *data,
1187                                   size_t size, size_t max);
1188 void snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
1189                                           int type, void *data,
1190                                           size_t size, size_t max);
1191 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
1192 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
1193
1194 void snd_pcm_set_managed_buffer(struct snd_pcm_substream *substream, int type,
1195                                 struct device *data, size_t size, size_t max);
1196 void snd_pcm_set_managed_buffer_all(struct snd_pcm *pcm, int type,
1197                                     struct device *data,
1198                                     size_t size, size_t max);
1199
1200 int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream,
1201                                       size_t size, gfp_t gfp_flags);
1202 int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream);
1203 struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream,
1204                                           unsigned long offset);
1205 /**
1206  * snd_pcm_lib_alloc_vmalloc_buffer - allocate virtual DMA buffer
1207  * @substream: the substream to allocate the buffer to
1208  * @size: the requested buffer size, in bytes
1209  *
1210  * Allocates the PCM substream buffer using vmalloc(), i.e., the memory is
1211  * contiguous in kernel virtual space, but not in physical memory.  Use this
1212  * if the buffer is accessed by kernel code but not by device DMA.
1213  *
1214  * Return: 1 if the buffer was changed, 0 if not changed, or a negative error
1215  * code.
1216  */
1217 static inline int snd_pcm_lib_alloc_vmalloc_buffer
1218                         (struct snd_pcm_substream *substream, size_t size)
1219 {
1220         return _snd_pcm_lib_alloc_vmalloc_buffer(substream, size,
1221                                                  GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
1222 }
1223
1224 /**
1225  * snd_pcm_lib_alloc_vmalloc_32_buffer - allocate 32-bit-addressable buffer
1226  * @substream: the substream to allocate the buffer to
1227  * @size: the requested buffer size, in bytes
1228  *
1229  * This function works like snd_pcm_lib_alloc_vmalloc_buffer(), but uses
1230  * vmalloc_32(), i.e., the pages are allocated from 32-bit-addressable memory.
1231  *
1232  * Return: 1 if the buffer was changed, 0 if not changed, or a negative error
1233  * code.
1234  */
1235 static inline int snd_pcm_lib_alloc_vmalloc_32_buffer
1236                         (struct snd_pcm_substream *substream, size_t size)
1237 {
1238         return _snd_pcm_lib_alloc_vmalloc_buffer(substream, size,
1239                                                  GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1240 }
1241
1242 #define snd_pcm_get_dma_buf(substream) ((substream)->runtime->dma_buffer_p)
1243
1244 #ifdef CONFIG_SND_DMA_SGBUF
1245 /*
1246  * SG-buffer handling
1247  */
1248 #define snd_pcm_substream_sgbuf(substream) \
1249         snd_pcm_get_dma_buf(substream)->private_data
1250 #endif /* SND_DMA_SGBUF */
1251
1252 /**
1253  * snd_pcm_sgbuf_get_addr - Get the DMA address at the corresponding offset
1254  * @substream: PCM substream
1255  * @ofs: byte offset
1256  */
1257 static inline dma_addr_t
1258 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
1259 {
1260         return snd_sgbuf_get_addr(snd_pcm_get_dma_buf(substream), ofs);
1261 }
1262
1263 /**
1264  * snd_pcm_sgbuf_get_ptr - Get the virtual address at the corresponding offset
1265  * @substream: PCM substream
1266  * @ofs: byte offset
1267  */
1268 static inline void *
1269 snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
1270 {
1271         return snd_sgbuf_get_ptr(snd_pcm_get_dma_buf(substream), ofs);
1272 }
1273
1274 /**
1275  * snd_pcm_sgbuf_chunk_size - Compute the max size that fits within the contig.
1276  * page from the given size
1277  * @substream: PCM substream
1278  * @ofs: byte offset
1279  * @size: byte size to examine
1280  */
1281 static inline unsigned int
1282 snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
1283                              unsigned int ofs, unsigned int size)
1284 {
1285         return snd_sgbuf_get_chunk_size(snd_pcm_get_dma_buf(substream), ofs, size);
1286 }
1287
1288 /**
1289  * snd_pcm_mmap_data_open - increase the mmap counter
1290  * @area: VMA
1291  *
1292  * PCM mmap callback should handle this counter properly
1293  */
1294 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
1295 {
1296         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1297         atomic_inc(&substream->mmap_count);
1298 }
1299
1300 /**
1301  * snd_pcm_mmap_data_close - decrease the mmap counter
1302  * @area: VMA
1303  *
1304  * PCM mmap callback should handle this counter properly
1305  */
1306 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
1307 {
1308         struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1309         atomic_dec(&substream->mmap_count);
1310 }
1311
1312 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
1313                              struct vm_area_struct *area);
1314 /* mmap for io-memory area */
1315 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
1316 #define SNDRV_PCM_INFO_MMAP_IOMEM       SNDRV_PCM_INFO_MMAP
1317 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
1318 #else
1319 #define SNDRV_PCM_INFO_MMAP_IOMEM       0
1320 #define snd_pcm_lib_mmap_iomem  NULL
1321 #endif
1322
1323 /**
1324  * snd_pcm_limit_isa_dma_size - Get the max size fitting with ISA DMA transfer
1325  * @dma: DMA number
1326  * @max: pointer to store the max size
1327  */
1328 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
1329 {
1330         *max = dma < 4 ? 64 * 1024 : 128 * 1024;
1331 }
1332
1333 /*
1334  *  Misc
1335  */
1336
1337 #define SNDRV_PCM_DEFAULT_CON_SPDIF     (IEC958_AES0_CON_EMPHASIS_NONE|\
1338                                          (IEC958_AES1_CON_ORIGINAL<<8)|\
1339                                          (IEC958_AES1_CON_PCM_CODER<<8)|\
1340                                          (IEC958_AES3_CON_FS_48000<<24))
1341
1342 const char *snd_pcm_format_name(snd_pcm_format_t format);
1343
1344 /**
1345  * snd_pcm_stream_str - Get a string naming the direction of a stream
1346  * @substream: the pcm substream instance
1347  *
1348  * Return: A string naming the direction of the stream.
1349  */
1350 static inline const char *snd_pcm_stream_str(struct snd_pcm_substream *substream)
1351 {
1352         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1353                 return "Playback";
1354         else
1355                 return "Capture";
1356 }
1357
1358 /*
1359  * PCM channel-mapping control API
1360  */
1361 /* array element of channel maps */
1362 struct snd_pcm_chmap_elem {
1363         unsigned char channels;
1364         unsigned char map[15];
1365 };
1366
1367 /* channel map information; retrieved via snd_kcontrol_chip() */
1368 struct snd_pcm_chmap {
1369         struct snd_pcm *pcm;    /* assigned PCM instance */
1370         int stream;             /* PLAYBACK or CAPTURE */
1371         struct snd_kcontrol *kctl;
1372         const struct snd_pcm_chmap_elem *chmap;
1373         unsigned int max_channels;
1374         unsigned int channel_mask;      /* optional: active channels bitmask */
1375         void *private_data;     /* optional: private data pointer */
1376 };
1377
1378 /**
1379  * snd_pcm_chmap_substream - get the PCM substream assigned to the given chmap info
1380  * @info: chmap information
1381  * @idx: the substream number index
1382  */
1383 static inline struct snd_pcm_substream *
1384 snd_pcm_chmap_substream(struct snd_pcm_chmap *info, unsigned int idx)
1385 {
1386         struct snd_pcm_substream *s;
1387         for (s = info->pcm->streams[info->stream].substream; s; s = s->next)
1388                 if (s->number == idx)
1389                         return s;
1390         return NULL;
1391 }
1392
1393 /* ALSA-standard channel maps (RL/RR prior to C/LFE) */
1394 extern const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[];
1395 /* Other world's standard channel maps (C/LFE prior to RL/RR) */
1396 extern const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[];
1397
1398 /* bit masks to be passed to snd_pcm_chmap.channel_mask field */
1399 #define SND_PCM_CHMAP_MASK_24   ((1U << 2) | (1U << 4))
1400 #define SND_PCM_CHMAP_MASK_246  (SND_PCM_CHMAP_MASK_24 | (1U << 6))
1401 #define SND_PCM_CHMAP_MASK_2468 (SND_PCM_CHMAP_MASK_246 | (1U << 8))
1402
1403 int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
1404                            const struct snd_pcm_chmap_elem *chmap,
1405                            int max_channels,
1406                            unsigned long private_value,
1407                            struct snd_pcm_chmap **info_ret);
1408
1409 /**
1410  * pcm_format_to_bits - Strong-typed conversion of pcm_format to bitwise
1411  * @pcm_format: PCM format
1412  */
1413 static inline u64 pcm_format_to_bits(snd_pcm_format_t pcm_format)
1414 {
1415         return 1ULL << (__force int) pcm_format;
1416 }
1417
1418 /* printk helpers */
1419 #define pcm_err(pcm, fmt, args...) \
1420         dev_err((pcm)->card->dev, fmt, ##args)
1421 #define pcm_warn(pcm, fmt, args...) \
1422         dev_warn((pcm)->card->dev, fmt, ##args)
1423 #define pcm_dbg(pcm, fmt, args...) \
1424         dev_dbg((pcm)->card->dev, fmt, ##args)
1425
1426 struct snd_pcm_status64 {
1427         snd_pcm_state_t state;          /* stream state */
1428         u8 rsvd[4];
1429         s64 trigger_tstamp_sec;         /* time when stream was started/stopped/paused */
1430         s64 trigger_tstamp_nsec;
1431         s64 tstamp_sec;                 /* reference timestamp */
1432         s64 tstamp_nsec;
1433         snd_pcm_uframes_t appl_ptr;     /* appl ptr */
1434         snd_pcm_uframes_t hw_ptr;       /* hw ptr */
1435         snd_pcm_sframes_t delay;        /* current delay in frames */
1436         snd_pcm_uframes_t avail;        /* number of frames available */
1437         snd_pcm_uframes_t avail_max;    /* max frames available on hw since last status */
1438         snd_pcm_uframes_t overrange;    /* count of ADC (capture) overrange detections from last status */
1439         snd_pcm_state_t suspended_state; /* suspended stream state */
1440         __u32 audio_tstamp_data;         /* needed for 64-bit alignment, used for configs/report to/from userspace */
1441         s64 audio_tstamp_sec;           /* sample counter, wall clock, PHC or on-demand sync'ed */
1442         s64 audio_tstamp_nsec;
1443         s64 driver_tstamp_sec;          /* useful in case reference system tstamp is reported with delay */
1444         s64 driver_tstamp_nsec;
1445         __u32 audio_tstamp_accuracy;    /* in ns units, only valid if indicated in audio_tstamp_data */
1446         unsigned char reserved[52-4*sizeof(s64)]; /* must be filled with zero */
1447 };
1448
1449 #define SNDRV_PCM_IOCTL_STATUS64        _IOR('A', 0x20, struct snd_pcm_status64)
1450 #define SNDRV_PCM_IOCTL_STATUS_EXT64    _IOWR('A', 0x24, struct snd_pcm_status64)
1451
1452 struct snd_pcm_status32 {
1453         s32 state;              /* stream state */
1454         s32 trigger_tstamp_sec; /* time when stream was started/stopped/paused */
1455         s32 trigger_tstamp_nsec;
1456         s32 tstamp_sec;         /* reference timestamp */
1457         s32 tstamp_nsec;
1458         u32 appl_ptr;           /* appl ptr */
1459         u32 hw_ptr;             /* hw ptr */
1460         s32 delay;              /* current delay in frames */
1461         u32 avail;              /* number of frames available */
1462         u32 avail_max;          /* max frames available on hw since last status */
1463         u32 overrange;          /* count of ADC (capture) overrange detections from last status */
1464         s32 suspended_state;    /* suspended stream state */
1465         u32 audio_tstamp_data;  /* needed for 64-bit alignment, used for configs/report to/from userspace */
1466         s32 audio_tstamp_sec;   /* sample counter, wall clock, PHC or on-demand sync'ed */
1467         s32 audio_tstamp_nsec;
1468         s32 driver_tstamp_sec;  /* useful in case reference system tstamp is reported with delay */
1469         s32 driver_tstamp_nsec;
1470         u32 audio_tstamp_accuracy;      /* in ns units, only valid if indicated in audio_tstamp_data */
1471         unsigned char reserved[52-4*sizeof(s32)]; /* must be filled with zero */
1472 };
1473
1474 #define SNDRV_PCM_IOCTL_STATUS32        _IOR('A', 0x20, struct snd_pcm_status32)
1475 #define SNDRV_PCM_IOCTL_STATUS_EXT32    _IOWR('A', 0x24, struct snd_pcm_status32)
1476
1477 #endif /* __SOUND_PCM_H */