include/sound/pcm.h

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

INCLUDED FROM

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