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 // For S32/U32 formats, 'msbits' hardware parameter is often used to deliver information about the 151 // available bit count in most significant bit. It's for the case of so-called 'left-justified' or 152 // `right-padding` sample which has less width than 32 bit. 153 #define SNDRV_PCM_FMTBIT_S32_LE _SNDRV_PCM_FMTBIT(S32_LE) 154 #define SNDRV_PCM_FMTBIT_S32_BE _SNDRV_PCM_FMTBIT(S32_BE) 155 #define SNDRV_PCM_FMTBIT_U32_LE _SNDRV_PCM_FMTBIT(U32_LE) 156 #define SNDRV_PCM_FMTBIT_U32_BE _SNDRV_PCM_FMTBIT(U32_BE) 157 #define SNDRV_PCM_FMTBIT_FLOAT_LE _SNDRV_PCM_FMTBIT(FLOAT_LE) 158 #define SNDRV_PCM_FMTBIT_FLOAT_BE _SNDRV_PCM_FMTBIT(FLOAT_BE) 159 #define SNDRV_PCM_FMTBIT_FLOAT64_LE _SNDRV_PCM_FMTBIT(FLOAT64_LE) 160 #define SNDRV_PCM_FMTBIT_FLOAT64_BE _SNDRV_PCM_FMTBIT(FLOAT64_BE) 161 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_LE) 162 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_BE) 163 #define SNDRV_PCM_FMTBIT_MU_LAW _SNDRV_PCM_FMTBIT(MU_LAW) 164 #define SNDRV_PCM_FMTBIT_A_LAW _SNDRV_PCM_FMTBIT(A_LAW) 165 #define SNDRV_PCM_FMTBIT_IMA_ADPCM _SNDRV_PCM_FMTBIT(IMA_ADPCM) 166 #define SNDRV_PCM_FMTBIT_MPEG _SNDRV_PCM_FMTBIT(MPEG) 167 #define SNDRV_PCM_FMTBIT_GSM _SNDRV_PCM_FMTBIT(GSM) 168 #define SNDRV_PCM_FMTBIT_S20_LE _SNDRV_PCM_FMTBIT(S20_LE) 169 #define SNDRV_PCM_FMTBIT_U20_LE _SNDRV_PCM_FMTBIT(U20_LE) 170 #define SNDRV_PCM_FMTBIT_S20_BE _SNDRV_PCM_FMTBIT(S20_BE) 171 #define SNDRV_PCM_FMTBIT_U20_BE _SNDRV_PCM_FMTBIT(U20_BE) 172 #define SNDRV_PCM_FMTBIT_SPECIAL _SNDRV_PCM_FMTBIT(SPECIAL) 173 #define SNDRV_PCM_FMTBIT_S24_3LE _SNDRV_PCM_FMTBIT(S24_3LE) 174 #define SNDRV_PCM_FMTBIT_U24_3LE _SNDRV_PCM_FMTBIT(U24_3LE) 175 #define SNDRV_PCM_FMTBIT_S24_3BE _SNDRV_PCM_FMTBIT(S24_3BE) 176 #define SNDRV_PCM_FMTBIT_U24_3BE _SNDRV_PCM_FMTBIT(U24_3BE) 177 #define SNDRV_PCM_FMTBIT_S20_3LE _SNDRV_PCM_FMTBIT(S20_3LE) 178 #define SNDRV_PCM_FMTBIT_U20_3LE _SNDRV_PCM_FMTBIT(U20_3LE) 179 #define SNDRV_PCM_FMTBIT_S20_3BE _SNDRV_PCM_FMTBIT(S20_3BE) 180 #define SNDRV_PCM_FMTBIT_U20_3BE _SNDRV_PCM_FMTBIT(U20_3BE) 181 #define SNDRV_PCM_FMTBIT_S18_3LE _SNDRV_PCM_FMTBIT(S18_3LE) 182 #define SNDRV_PCM_FMTBIT_U18_3LE _SNDRV_PCM_FMTBIT(U18_3LE) 183 #define SNDRV_PCM_FMTBIT_S18_3BE _SNDRV_PCM_FMTBIT(S18_3BE) 184 #define SNDRV_PCM_FMTBIT_U18_3BE _SNDRV_PCM_FMTBIT(U18_3BE) 185 #define SNDRV_PCM_FMTBIT_G723_24 _SNDRV_PCM_FMTBIT(G723_24) 186 #define SNDRV_PCM_FMTBIT_G723_24_1B _SNDRV_PCM_FMTBIT(G723_24_1B) 187 #define SNDRV_PCM_FMTBIT_G723_40 _SNDRV_PCM_FMTBIT(G723_40) 188 #define SNDRV_PCM_FMTBIT_G723_40_1B _SNDRV_PCM_FMTBIT(G723_40_1B) 189 #define SNDRV_PCM_FMTBIT_DSD_U8 _SNDRV_PCM_FMTBIT(DSD_U8) 190 #define SNDRV_PCM_FMTBIT_DSD_U16_LE _SNDRV_PCM_FMTBIT(DSD_U16_LE) 191 #define SNDRV_PCM_FMTBIT_DSD_U32_LE _SNDRV_PCM_FMTBIT(DSD_U32_LE) 192 #define SNDRV_PCM_FMTBIT_DSD_U16_BE _SNDRV_PCM_FMTBIT(DSD_U16_BE) 193 #define SNDRV_PCM_FMTBIT_DSD_U32_BE _SNDRV_PCM_FMTBIT(DSD_U32_BE) 194 195 #ifdef SNDRV_LITTLE_ENDIAN 196 #define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_LE 197 #define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_LE 198 #define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_LE 199 #define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_LE 200 #define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_LE 201 #define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_LE 202 #define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_LE 203 #define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_LE 204 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE 205 #define SNDRV_PCM_FMTBIT_S20 SNDRV_PCM_FMTBIT_S20_LE 206 #define SNDRV_PCM_FMTBIT_U20 SNDRV_PCM_FMTBIT_U20_LE 207 #endif 208 #ifdef SNDRV_BIG_ENDIAN 209 #define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_BE 210 #define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_BE 211 #define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_BE 212 #define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_BE 213 #define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_BE 214 #define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_BE 215 #define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_BE 216 #define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_BE 217 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE 218 #define SNDRV_PCM_FMTBIT_S20 SNDRV_PCM_FMTBIT_S20_BE 219 #define SNDRV_PCM_FMTBIT_U20 SNDRV_PCM_FMTBIT_U20_BE 220 #endif 221 222 struct snd_pcm_file { 223 struct snd_pcm_substream *substream; 224 int no_compat_mmap; 225 unsigned int user_pversion; /* supported protocol version */ 226 }; 227 228 struct snd_pcm_hw_rule; 229 typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params, 230 struct snd_pcm_hw_rule *rule); 231 232 struct snd_pcm_hw_rule { 233 unsigned int cond; 234 int var; 235 int deps[5]; 236 237 snd_pcm_hw_rule_func_t func; 238 void *private; 239 }; 240 241 struct snd_pcm_hw_constraints { 242 struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK - 243 SNDRV_PCM_HW_PARAM_FIRST_MASK + 1]; 244 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL - 245 SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1]; 246 unsigned int rules_num; 247 unsigned int rules_all; 248 struct snd_pcm_hw_rule *rules; 249 }; 250 251 static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs, 252 snd_pcm_hw_param_t var) 253 { 254 return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK]; 255 } 256 257 static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs, 258 snd_pcm_hw_param_t var) 259 { 260 return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL]; 261 } 262 263 struct snd_ratnum { 264 unsigned int num; 265 unsigned int den_min, den_max, den_step; 266 }; 267 268 struct snd_ratden { 269 unsigned int num_min, num_max, num_step; 270 unsigned int den; 271 }; 272 273 struct snd_pcm_hw_constraint_ratnums { 274 int nrats; 275 const struct snd_ratnum *rats; 276 }; 277 278 struct snd_pcm_hw_constraint_ratdens { 279 int nrats; 280 const struct snd_ratden *rats; 281 }; 282 283 struct snd_pcm_hw_constraint_list { 284 const unsigned int *list; 285 unsigned int count; 286 unsigned int mask; 287 }; 288 289 struct snd_pcm_hw_constraint_ranges { 290 unsigned int count; 291 const struct snd_interval *ranges; 292 unsigned int mask; 293 }; 294 295 /* 296 * userspace-provided audio timestamp config to kernel, 297 * structure is for internal use only and filled with dedicated unpack routine 298 */ 299 struct snd_pcm_audio_tstamp_config { 300 /* 5 of max 16 bits used */ 301 u32 type_requested:4; 302 u32 report_delay:1; /* add total delay to A/D or D/A */ 303 }; 304 305 static inline void snd_pcm_unpack_audio_tstamp_config(__u32 data, 306 struct snd_pcm_audio_tstamp_config *config) 307 { 308 config->type_requested = data & 0xF; 309 config->report_delay = (data >> 4) & 1; 310 } 311 312 /* 313 * kernel-provided audio timestamp report to user-space 314 * structure is for internal use only and read by dedicated pack routine 315 */ 316 struct snd_pcm_audio_tstamp_report { 317 /* 6 of max 16 bits used for bit-fields */ 318 319 /* for backwards compatibility */ 320 u32 valid:1; 321 322 /* actual type if hardware could not support requested timestamp */ 323 u32 actual_type:4; 324 325 /* accuracy represented in ns units */ 326 u32 accuracy_report:1; /* 0 if accuracy unknown, 1 if accuracy field is valid */ 327 u32 accuracy; /* up to 4.29s, will be packed in separate field */ 328 }; 329 330 static inline void snd_pcm_pack_audio_tstamp_report(__u32 *data, __u32 *accuracy, 331 const struct snd_pcm_audio_tstamp_report *report) 332 { 333 u32 tmp; 334 335 tmp = report->accuracy_report; 336 tmp <<= 4; 337 tmp |= report->actual_type; 338 tmp <<= 1; 339 tmp |= report->valid; 340 341 *data &= 0xffff; /* zero-clear MSBs */ 342 *data |= (tmp << 16); 343 *accuracy = report->accuracy; 344 } 345 346 347 struct snd_pcm_runtime { 348 /* -- Status -- */ 349 struct snd_pcm_substream *trigger_master; 350 struct timespec64 trigger_tstamp; /* trigger timestamp */ 351 bool trigger_tstamp_latched; /* trigger timestamp latched in low-level driver/hardware */ 352 int overrange; 353 snd_pcm_uframes_t avail_max; 354 snd_pcm_uframes_t hw_ptr_base; /* Position at buffer restart */ 355 snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time */ 356 unsigned long hw_ptr_jiffies; /* Time when hw_ptr is updated */ 357 unsigned long hw_ptr_buffer_jiffies; /* buffer time in jiffies */ 358 snd_pcm_sframes_t delay; /* extra delay; typically FIFO size */ 359 u64 hw_ptr_wrap; /* offset for hw_ptr due to boundary wrap-around */ 360 361 /* -- HW params -- */ 362 snd_pcm_access_t access; /* access mode */ 363 snd_pcm_format_t format; /* SNDRV_PCM_FORMAT_* */ 364 snd_pcm_subformat_t subformat; /* subformat */ 365 unsigned int rate; /* rate in Hz */ 366 unsigned int channels; /* channels */ 367 snd_pcm_uframes_t period_size; /* period size */ 368 unsigned int periods; /* periods */ 369 snd_pcm_uframes_t buffer_size; /* buffer size */ 370 snd_pcm_uframes_t min_align; /* Min alignment for the format */ 371 size_t byte_align; 372 unsigned int frame_bits; 373 unsigned int sample_bits; 374 unsigned int info; 375 unsigned int rate_num; 376 unsigned int rate_den; 377 unsigned int no_period_wakeup: 1; 378 379 /* -- SW params -- */ 380 int tstamp_mode; /* mmap timestamp is updated */ 381 unsigned int period_step; 382 snd_pcm_uframes_t start_threshold; 383 snd_pcm_uframes_t stop_threshold; 384 snd_pcm_uframes_t silence_threshold; /* Silence filling happens when 385 noise is nearest than this */ 386 snd_pcm_uframes_t silence_size; /* Silence filling size */ 387 snd_pcm_uframes_t boundary; /* pointers wrap point */ 388 389 snd_pcm_uframes_t silence_start; /* starting pointer to silence area */ 390 snd_pcm_uframes_t silence_filled; /* size filled with silence */ 391 392 union snd_pcm_sync_id sync; /* hardware synchronization ID */ 393 394 /* -- mmap -- */ 395 struct snd_pcm_mmap_status *status; 396 struct snd_pcm_mmap_control *control; 397 398 /* -- locking / scheduling -- */ 399 snd_pcm_uframes_t twake; /* do transfer (!poll) wakeup if non-zero */ 400 wait_queue_head_t sleep; /* poll sleep */ 401 wait_queue_head_t tsleep; /* transfer sleep */ 402 struct fasync_struct *fasync; 403 bool stop_operating; /* sync_stop will be called */ 404 405 /* -- private section -- */ 406 void *private_data; 407 void (*private_free)(struct snd_pcm_runtime *runtime); 408 409 /* -- hardware description -- */ 410 struct snd_pcm_hardware hw; 411 struct snd_pcm_hw_constraints hw_constraints; 412 413 /* -- timer -- */ 414 unsigned int timer_resolution; /* timer resolution */ 415 int tstamp_type; /* timestamp type */ 416 417 /* -- DMA -- */ 418 unsigned char *dma_area; /* DMA area */ 419 dma_addr_t dma_addr; /* physical bus address (not accessible from main CPU) */ 420 size_t dma_bytes; /* size of DMA area */ 421 422 struct snd_dma_buffer *dma_buffer_p; /* allocated buffer */ 423 unsigned int buffer_changed:1; /* buffer allocation changed; set only in managed mode */ 424 425 /* -- audio timestamp config -- */ 426 struct snd_pcm_audio_tstamp_config audio_tstamp_config; 427 struct snd_pcm_audio_tstamp_report audio_tstamp_report; 428 struct timespec64 driver_tstamp; 429 430 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 431 /* -- OSS things -- */ 432 struct snd_pcm_oss_runtime oss; 433 #endif 434 }; 435 436 struct snd_pcm_group { /* keep linked substreams */ 437 spinlock_t lock; 438 struct mutex mutex; 439 struct list_head substreams; 440 refcount_t refs; 441 }; 442 443 struct pid; 444 445 struct snd_pcm_substream { 446 struct snd_pcm *pcm; 447 struct snd_pcm_str *pstr; 448 void *private_data; /* copied from pcm->private_data */ 449 int number; 450 char name[32]; /* substream name */ 451 int stream; /* stream (direction) */ 452 struct pm_qos_request latency_pm_qos_req; /* pm_qos request */ 453 size_t buffer_bytes_max; /* limit ring buffer size */ 454 struct snd_dma_buffer dma_buffer; 455 size_t dma_max; 456 /* -- hardware operations -- */ 457 const struct snd_pcm_ops *ops; 458 /* -- runtime information -- */ 459 struct snd_pcm_runtime *runtime; 460 /* -- timer section -- */ 461 struct snd_timer *timer; /* timer */ 462 unsigned timer_running: 1; /* time is running */ 463 long wait_time; /* time in ms for R/W to wait for avail */ 464 /* -- next substream -- */ 465 struct snd_pcm_substream *next; 466 /* -- linked substreams -- */ 467 struct list_head link_list; /* linked list member */ 468 struct snd_pcm_group self_group; /* fake group for non linked substream (with substream lock inside) */ 469 struct snd_pcm_group *group; /* pointer to current group */ 470 /* -- assigned files -- */ 471 int ref_count; 472 atomic_t mmap_count; 473 unsigned int f_flags; 474 void (*pcm_release)(struct snd_pcm_substream *); 475 struct pid *pid; 476 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 477 /* -- OSS things -- */ 478 struct snd_pcm_oss_substream oss; 479 #endif 480 #ifdef CONFIG_SND_VERBOSE_PROCFS 481 struct snd_info_entry *proc_root; 482 #endif /* CONFIG_SND_VERBOSE_PROCFS */ 483 /* misc flags */ 484 unsigned int hw_opened: 1; 485 unsigned int managed_buffer_alloc:1; 486 }; 487 488 #define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0) 489 490 491 struct snd_pcm_str { 492 int stream; /* stream (direction) */ 493 struct snd_pcm *pcm; 494 /* -- substreams -- */ 495 unsigned int substream_count; 496 unsigned int substream_opened; 497 struct snd_pcm_substream *substream; 498 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 499 /* -- OSS things -- */ 500 struct snd_pcm_oss_stream oss; 501 #endif 502 #ifdef CONFIG_SND_VERBOSE_PROCFS 503 struct snd_info_entry *proc_root; 504 #ifdef CONFIG_SND_PCM_XRUN_DEBUG 505 unsigned int xrun_debug; /* 0 = disabled, 1 = verbose, 2 = stacktrace */ 506 #endif 507 #endif 508 struct snd_kcontrol *chmap_kctl; /* channel-mapping controls */ 509 struct device dev; 510 }; 511 512 struct snd_pcm { 513 struct snd_card *card; 514 struct list_head list; 515 int device; /* device number */ 516 unsigned int info_flags; 517 unsigned short dev_class; 518 unsigned short dev_subclass; 519 char id[64]; 520 char name[80]; 521 struct snd_pcm_str streams[2]; 522 struct mutex open_mutex; 523 wait_queue_head_t open_wait; 524 void *private_data; 525 void (*private_free) (struct snd_pcm *pcm); 526 bool internal; /* pcm is for internal use only */ 527 bool nonatomic; /* whole PCM operations are in non-atomic context */ 528 bool no_device_suspend; /* don't invoke device PM suspend */ 529 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 530 struct snd_pcm_oss oss; 531 #endif 532 }; 533 534 /* 535 * Registering 536 */ 537 538 extern const struct file_operations snd_pcm_f_ops[2]; 539 540 int snd_pcm_new(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_internal(struct snd_card *card, const char *id, int device, 544 int playback_count, int capture_count, 545 struct snd_pcm **rpcm); 546 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count); 547 548 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 549 struct snd_pcm_notify { 550 int (*n_register) (struct snd_pcm * pcm); 551 int (*n_disconnect) (struct snd_pcm * pcm); 552 int (*n_unregister) (struct snd_pcm * pcm); 553 struct list_head list; 554 }; 555 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree); 556 #endif 557 558 /* 559 * Native I/O 560 */ 561 562 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info); 563 int snd_pcm_info_user(struct snd_pcm_substream *substream, 564 struct snd_pcm_info __user *info); 565 int snd_pcm_status64(struct snd_pcm_substream *substream, 566 struct snd_pcm_status64 *status); 567 int snd_pcm_start(struct snd_pcm_substream *substream); 568 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t status); 569 int snd_pcm_drain_done(struct snd_pcm_substream *substream); 570 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream); 571 #ifdef CONFIG_PM 572 int snd_pcm_suspend_all(struct snd_pcm *pcm); 573 #else 574 static inline int snd_pcm_suspend_all(struct snd_pcm *pcm) 575 { 576 return 0; 577 } 578 #endif 579 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg); 580 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file, 581 struct snd_pcm_substream **rsubstream); 582 void snd_pcm_release_substream(struct snd_pcm_substream *substream); 583 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file, 584 struct snd_pcm_substream **rsubstream); 585 void snd_pcm_detach_substream(struct snd_pcm_substream *substream); 586 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area); 587 588 589 #ifdef CONFIG_SND_DEBUG 590 void snd_pcm_debug_name(struct snd_pcm_substream *substream, 591 char *name, size_t len); 592 #else 593 static inline void 594 snd_pcm_debug_name(struct snd_pcm_substream *substream, char *buf, size_t size) 595 { 596 *buf = 0; 597 } 598 #endif 599 600 /* 601 * PCM library 602 */ 603 604 /** 605 * snd_pcm_stream_linked - Check whether the substream is linked with others 606 * @substream: substream to check 607 * 608 * Returns true if the given substream is being linked with others. 609 */ 610 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream) 611 { 612 return substream->group != &substream->self_group; 613 } 614 615 void snd_pcm_stream_lock(struct snd_pcm_substream *substream); 616 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream); 617 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream); 618 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream); 619 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream); 620 unsigned long _snd_pcm_stream_lock_irqsave_nested(struct snd_pcm_substream *substream); 621 622 /** 623 * snd_pcm_stream_lock_irqsave - Lock the PCM stream 624 * @substream: PCM substream 625 * @flags: irq flags 626 * 627 * This locks the PCM stream like snd_pcm_stream_lock() but with the local 628 * IRQ (only when nonatomic is false). In nonatomic case, this is identical 629 * as snd_pcm_stream_lock(). 630 */ 631 #define snd_pcm_stream_lock_irqsave(substream, flags) \ 632 do { \ 633 typecheck(unsigned long, flags); \ 634 flags = _snd_pcm_stream_lock_irqsave(substream); \ 635 } while (0) 636 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream, 637 unsigned long flags); 638 639 /** 640 * snd_pcm_stream_lock_irqsave_nested - Single-nested PCM stream locking 641 * @substream: PCM substream 642 * @flags: irq flags 643 * 644 * This locks the PCM stream like snd_pcm_stream_lock_irqsave() but with 645 * the single-depth lockdep subclass. 646 */ 647 #define snd_pcm_stream_lock_irqsave_nested(substream, flags) \ 648 do { \ 649 typecheck(unsigned long, flags); \ 650 flags = _snd_pcm_stream_lock_irqsave_nested(substream); \ 651 } while (0) 652 653 /** 654 * snd_pcm_group_for_each_entry - iterate over the linked substreams 655 * @s: the iterator 656 * @substream: the substream 657 * 658 * Iterate over the all linked substreams to the given @substream. 659 * When @substream isn't linked with any others, this gives returns @substream 660 * itself once. 661 */ 662 #define snd_pcm_group_for_each_entry(s, substream) \ 663 list_for_each_entry(s, &substream->group->substreams, link_list) 664 665 #define for_each_pcm_streams(stream) \ 666 for (stream = SNDRV_PCM_STREAM_PLAYBACK; \ 667 stream <= SNDRV_PCM_STREAM_LAST; \ 668 stream++) 669 670 /** 671 * snd_pcm_running - Check whether the substream is in a running state 672 * @substream: substream to check 673 * 674 * Returns true if the given substream is in the state RUNNING, or in the 675 * state DRAINING for playback. 676 */ 677 static inline int snd_pcm_running(struct snd_pcm_substream *substream) 678 { 679 return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING || 680 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING && 681 substream->stream == SNDRV_PCM_STREAM_PLAYBACK)); 682 } 683 684 /** 685 * bytes_to_samples - Unit conversion of the size from bytes to samples 686 * @runtime: PCM runtime instance 687 * @size: size in bytes 688 */ 689 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size) 690 { 691 return size * 8 / runtime->sample_bits; 692 } 693 694 /** 695 * bytes_to_frames - Unit conversion of the size from bytes to frames 696 * @runtime: PCM runtime instance 697 * @size: size in bytes 698 */ 699 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size) 700 { 701 return size * 8 / runtime->frame_bits; 702 } 703 704 /** 705 * samples_to_bytes - Unit conversion of the size from samples to bytes 706 * @runtime: PCM runtime instance 707 * @size: size in samples 708 */ 709 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size) 710 { 711 return size * runtime->sample_bits / 8; 712 } 713 714 /** 715 * frames_to_bytes - Unit conversion of the size from frames to bytes 716 * @runtime: PCM runtime instance 717 * @size: size in frames 718 */ 719 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size) 720 { 721 return size * runtime->frame_bits / 8; 722 } 723 724 /** 725 * frame_aligned - Check whether the byte size is aligned to frames 726 * @runtime: PCM runtime instance 727 * @bytes: size in bytes 728 */ 729 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes) 730 { 731 return bytes % runtime->byte_align == 0; 732 } 733 734 /** 735 * snd_pcm_lib_buffer_bytes - Get the buffer size of the current PCM in bytes 736 * @substream: PCM substream 737 */ 738 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream) 739 { 740 struct snd_pcm_runtime *runtime = substream->runtime; 741 return frames_to_bytes(runtime, runtime->buffer_size); 742 } 743 744 /** 745 * snd_pcm_lib_period_bytes - Get the period size of the current PCM in bytes 746 * @substream: PCM substream 747 */ 748 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream) 749 { 750 struct snd_pcm_runtime *runtime = substream->runtime; 751 return frames_to_bytes(runtime, runtime->period_size); 752 } 753 754 /** 755 * snd_pcm_playback_avail - Get the available (writable) space for playback 756 * @runtime: PCM runtime instance 757 * 758 * Result is between 0 ... (boundary - 1) 759 */ 760 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime) 761 { 762 snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr; 763 if (avail < 0) 764 avail += runtime->boundary; 765 else if ((snd_pcm_uframes_t) avail >= runtime->boundary) 766 avail -= runtime->boundary; 767 return avail; 768 } 769 770 /** 771 * snd_pcm_capture_avail - Get the available (readable) space for capture 772 * @runtime: PCM runtime instance 773 * 774 * Result is between 0 ... (boundary - 1) 775 */ 776 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime) 777 { 778 snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr; 779 if (avail < 0) 780 avail += runtime->boundary; 781 return avail; 782 } 783 784 /** 785 * snd_pcm_playback_hw_avail - Get the queued space for playback 786 * @runtime: PCM runtime instance 787 */ 788 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime) 789 { 790 return runtime->buffer_size - snd_pcm_playback_avail(runtime); 791 } 792 793 /** 794 * snd_pcm_capture_hw_avail - Get the free space for capture 795 * @runtime: PCM runtime instance 796 */ 797 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime) 798 { 799 return runtime->buffer_size - snd_pcm_capture_avail(runtime); 800 } 801 802 /** 803 * snd_pcm_playback_ready - check whether the playback buffer is available 804 * @substream: the pcm substream instance 805 * 806 * Checks whether enough free space is available on the playback buffer. 807 * 808 * Return: Non-zero if available, or zero if not. 809 */ 810 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream) 811 { 812 struct snd_pcm_runtime *runtime = substream->runtime; 813 return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min; 814 } 815 816 /** 817 * snd_pcm_capture_ready - check whether the capture buffer is available 818 * @substream: the pcm substream instance 819 * 820 * Checks whether enough capture data is available on the capture buffer. 821 * 822 * Return: Non-zero if available, or zero if not. 823 */ 824 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream) 825 { 826 struct snd_pcm_runtime *runtime = substream->runtime; 827 return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min; 828 } 829 830 /** 831 * snd_pcm_playback_data - check whether any data exists on the playback buffer 832 * @substream: the pcm substream instance 833 * 834 * Checks whether any data exists on the playback buffer. 835 * 836 * Return: Non-zero if any data exists, or zero if not. If stop_threshold 837 * is bigger or equal to boundary, then this function returns always non-zero. 838 */ 839 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream) 840 { 841 struct snd_pcm_runtime *runtime = substream->runtime; 842 843 if (runtime->stop_threshold >= runtime->boundary) 844 return 1; 845 return snd_pcm_playback_avail(runtime) < runtime->buffer_size; 846 } 847 848 /** 849 * snd_pcm_playback_empty - check whether the playback buffer is empty 850 * @substream: the pcm substream instance 851 * 852 * Checks whether the playback buffer is empty. 853 * 854 * Return: Non-zero if empty, or zero if not. 855 */ 856 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream) 857 { 858 struct snd_pcm_runtime *runtime = substream->runtime; 859 return snd_pcm_playback_avail(runtime) >= runtime->buffer_size; 860 } 861 862 /** 863 * snd_pcm_capture_empty - check whether the capture buffer is empty 864 * @substream: the pcm substream instance 865 * 866 * Checks whether the capture buffer is empty. 867 * 868 * Return: Non-zero if empty, or zero if not. 869 */ 870 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream) 871 { 872 struct snd_pcm_runtime *runtime = substream->runtime; 873 return snd_pcm_capture_avail(runtime) == 0; 874 } 875 876 /** 877 * snd_pcm_trigger_done - Mark the master substream 878 * @substream: the pcm substream instance 879 * @master: the linked master substream 880 * 881 * When multiple substreams of the same card are linked and the hardware 882 * supports the single-shot operation, the driver calls this in the loop 883 * in snd_pcm_group_for_each_entry() for marking the substream as "done". 884 * Then most of trigger operations are performed only to the given master 885 * substream. 886 * 887 * The trigger_master mark is cleared at timestamp updates at the end 888 * of trigger operations. 889 */ 890 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream, 891 struct snd_pcm_substream *master) 892 { 893 substream->runtime->trigger_master = master; 894 } 895 896 static inline int hw_is_mask(int var) 897 { 898 return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK && 899 var <= SNDRV_PCM_HW_PARAM_LAST_MASK; 900 } 901 902 static inline int hw_is_interval(int var) 903 { 904 return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL && 905 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; 906 } 907 908 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params, 909 snd_pcm_hw_param_t var) 910 { 911 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK]; 912 } 913 914 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params, 915 snd_pcm_hw_param_t var) 916 { 917 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL]; 918 } 919 920 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params, 921 snd_pcm_hw_param_t var) 922 { 923 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK]; 924 } 925 926 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params, 927 snd_pcm_hw_param_t var) 928 { 929 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL]; 930 } 931 932 /** 933 * params_channels - Get the number of channels from the hw params 934 * @p: hw params 935 */ 936 static inline unsigned int params_channels(const struct snd_pcm_hw_params *p) 937 { 938 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_CHANNELS)->min; 939 } 940 941 /** 942 * params_rate - Get the sample rate from the hw params 943 * @p: hw params 944 */ 945 static inline unsigned int params_rate(const struct snd_pcm_hw_params *p) 946 { 947 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_RATE)->min; 948 } 949 950 /** 951 * params_period_size - Get the period size (in frames) from the hw params 952 * @p: hw params 953 */ 954 static inline unsigned int params_period_size(const struct snd_pcm_hw_params *p) 955 { 956 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min; 957 } 958 959 /** 960 * params_periods - Get the number of periods from the hw params 961 * @p: hw params 962 */ 963 static inline unsigned int params_periods(const struct snd_pcm_hw_params *p) 964 { 965 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIODS)->min; 966 } 967 968 /** 969 * params_buffer_size - Get the buffer size (in frames) from the hw params 970 * @p: hw params 971 */ 972 static inline unsigned int params_buffer_size(const struct snd_pcm_hw_params *p) 973 { 974 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min; 975 } 976 977 /** 978 * params_buffer_bytes - Get the buffer size (in bytes) from the hw params 979 * @p: hw params 980 */ 981 static inline unsigned int params_buffer_bytes(const struct snd_pcm_hw_params *p) 982 { 983 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min; 984 } 985 986 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v); 987 int snd_interval_list(struct snd_interval *i, unsigned int count, 988 const unsigned int *list, unsigned int mask); 989 int snd_interval_ranges(struct snd_interval *i, unsigned int count, 990 const struct snd_interval *list, unsigned int mask); 991 int snd_interval_ratnum(struct snd_interval *i, 992 unsigned int rats_count, const struct snd_ratnum *rats, 993 unsigned int *nump, unsigned int *denp); 994 995 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params); 996 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var); 997 998 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params); 999 1000 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, 1001 u_int64_t mask); 1002 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, 1003 unsigned int min, unsigned int max); 1004 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var); 1005 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime, 1006 unsigned int cond, 1007 snd_pcm_hw_param_t var, 1008 const struct snd_pcm_hw_constraint_list *l); 1009 int snd_pcm_hw_constraint_ranges(struct snd_pcm_runtime *runtime, 1010 unsigned int cond, 1011 snd_pcm_hw_param_t var, 1012 const struct snd_pcm_hw_constraint_ranges *r); 1013 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime, 1014 unsigned int cond, 1015 snd_pcm_hw_param_t var, 1016 const struct snd_pcm_hw_constraint_ratnums *r); 1017 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime, 1018 unsigned int cond, 1019 snd_pcm_hw_param_t var, 1020 const struct snd_pcm_hw_constraint_ratdens *r); 1021 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime, 1022 unsigned int cond, 1023 unsigned int width, 1024 unsigned int msbits); 1025 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime, 1026 unsigned int cond, 1027 snd_pcm_hw_param_t var, 1028 unsigned long step); 1029 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime, 1030 unsigned int cond, 1031 snd_pcm_hw_param_t var); 1032 int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime, 1033 unsigned int base_rate); 1034 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, 1035 unsigned int cond, 1036 int var, 1037 snd_pcm_hw_rule_func_t func, void *private, 1038 int dep, ...); 1039 1040 /** 1041 * snd_pcm_hw_constraint_single() - Constrain parameter to a single value 1042 * @runtime: PCM runtime instance 1043 * @var: The hw_params variable to constrain 1044 * @val: The value to constrain to 1045 * 1046 * Return: Positive if the value is changed, zero if it's not changed, or a 1047 * negative error code. 1048 */ 1049 static inline int snd_pcm_hw_constraint_single( 1050 struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, 1051 unsigned int val) 1052 { 1053 return snd_pcm_hw_constraint_minmax(runtime, var, val, val); 1054 } 1055 1056 int snd_pcm_format_signed(snd_pcm_format_t format); 1057 int snd_pcm_format_unsigned(snd_pcm_format_t format); 1058 int snd_pcm_format_linear(snd_pcm_format_t format); 1059 int snd_pcm_format_little_endian(snd_pcm_format_t format); 1060 int snd_pcm_format_big_endian(snd_pcm_format_t format); 1061 #if 0 /* just for kernel-doc */ 1062 /** 1063 * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian 1064 * @format: the format to check 1065 * 1066 * Return: 1 if the given PCM format is CPU-endian, 0 if 1067 * opposite, or a negative error code if endian not specified. 1068 */ 1069 int snd_pcm_format_cpu_endian(snd_pcm_format_t format); 1070 #endif /* DocBook */ 1071 #ifdef SNDRV_LITTLE_ENDIAN 1072 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format) 1073 #else 1074 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format) 1075 #endif 1076 int snd_pcm_format_width(snd_pcm_format_t format); /* in bits */ 1077 int snd_pcm_format_physical_width(snd_pcm_format_t format); /* in bits */ 1078 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples); 1079 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format); 1080 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames); 1081 1082 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction, 1083 const struct snd_pcm_ops *ops); 1084 void snd_pcm_set_sync(struct snd_pcm_substream *substream); 1085 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream, 1086 unsigned int cmd, void *arg); 1087 void snd_pcm_period_elapsed_under_stream_lock(struct snd_pcm_substream *substream); 1088 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream); 1089 snd_pcm_sframes_t __snd_pcm_lib_xfer(struct snd_pcm_substream *substream, 1090 void *buf, bool interleaved, 1091 snd_pcm_uframes_t frames, bool in_kernel); 1092 1093 static inline snd_pcm_sframes_t 1094 snd_pcm_lib_write(struct snd_pcm_substream *substream, 1095 const void __user *buf, snd_pcm_uframes_t frames) 1096 { 1097 return __snd_pcm_lib_xfer(substream, (void __force *)buf, true, frames, false); 1098 } 1099 1100 static inline snd_pcm_sframes_t 1101 snd_pcm_lib_read(struct snd_pcm_substream *substream, 1102 void __user *buf, snd_pcm_uframes_t frames) 1103 { 1104 return __snd_pcm_lib_xfer(substream, (void __force *)buf, true, frames, false); 1105 } 1106 1107 static inline snd_pcm_sframes_t 1108 snd_pcm_lib_writev(struct snd_pcm_substream *substream, 1109 void __user **bufs, snd_pcm_uframes_t frames) 1110 { 1111 return __snd_pcm_lib_xfer(substream, (void *)bufs, false, frames, false); 1112 } 1113 1114 static inline snd_pcm_sframes_t 1115 snd_pcm_lib_readv(struct snd_pcm_substream *substream, 1116 void __user **bufs, snd_pcm_uframes_t frames) 1117 { 1118 return __snd_pcm_lib_xfer(substream, (void *)bufs, false, frames, false); 1119 } 1120 1121 static inline snd_pcm_sframes_t 1122 snd_pcm_kernel_write(struct snd_pcm_substream *substream, 1123 const void *buf, snd_pcm_uframes_t frames) 1124 { 1125 return __snd_pcm_lib_xfer(substream, (void *)buf, true, frames, true); 1126 } 1127 1128 static inline snd_pcm_sframes_t 1129 snd_pcm_kernel_read(struct snd_pcm_substream *substream, 1130 void *buf, snd_pcm_uframes_t frames) 1131 { 1132 return __snd_pcm_lib_xfer(substream, buf, true, frames, true); 1133 } 1134 1135 static inline snd_pcm_sframes_t 1136 snd_pcm_kernel_writev(struct snd_pcm_substream *substream, 1137 void **bufs, snd_pcm_uframes_t frames) 1138 { 1139 return __snd_pcm_lib_xfer(substream, bufs, false, frames, true); 1140 } 1141 1142 static inline snd_pcm_sframes_t 1143 snd_pcm_kernel_readv(struct snd_pcm_substream *substream, 1144 void **bufs, snd_pcm_uframes_t frames) 1145 { 1146 return __snd_pcm_lib_xfer(substream, bufs, false, frames, true); 1147 } 1148 1149 int snd_pcm_hw_limit_rates(struct snd_pcm_hardware *hw); 1150 1151 static inline int 1152 snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime) 1153 { 1154 return snd_pcm_hw_limit_rates(&runtime->hw); 1155 } 1156 1157 unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate); 1158 unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit); 1159 unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a, 1160 unsigned int rates_b); 1161 unsigned int snd_pcm_rate_range_to_bits(unsigned int rate_min, 1162 unsigned int rate_max); 1163 1164 /** 1165 * snd_pcm_set_runtime_buffer - Set the PCM runtime buffer 1166 * @substream: PCM substream to set 1167 * @bufp: the buffer information, NULL to clear 1168 * 1169 * Copy the buffer information to runtime->dma_buffer when @bufp is non-NULL. 1170 * Otherwise it clears the current buffer information. 1171 */ 1172 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream, 1173 struct snd_dma_buffer *bufp) 1174 { 1175 struct snd_pcm_runtime *runtime = substream->runtime; 1176 if (bufp) { 1177 runtime->dma_buffer_p = bufp; 1178 runtime->dma_area = bufp->area; 1179 runtime->dma_addr = bufp->addr; 1180 runtime->dma_bytes = bufp->bytes; 1181 } else { 1182 runtime->dma_buffer_p = NULL; 1183 runtime->dma_area = NULL; 1184 runtime->dma_addr = 0; 1185 runtime->dma_bytes = 0; 1186 } 1187 } 1188 1189 /** 1190 * snd_pcm_gettime - Fill the timespec64 depending on the timestamp mode 1191 * @runtime: PCM runtime instance 1192 * @tv: timespec64 to fill 1193 */ 1194 static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime, 1195 struct timespec64 *tv) 1196 { 1197 switch (runtime->tstamp_type) { 1198 case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC: 1199 ktime_get_ts64(tv); 1200 break; 1201 case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC_RAW: 1202 ktime_get_raw_ts64(tv); 1203 break; 1204 default: 1205 ktime_get_real_ts64(tv); 1206 break; 1207 } 1208 } 1209 1210 /* 1211 * Memory 1212 */ 1213 1214 void snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream); 1215 void snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm); 1216 void snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream, 1217 int type, struct device *data, 1218 size_t size, size_t max); 1219 void snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm, 1220 int type, void *data, 1221 size_t size, size_t max); 1222 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size); 1223 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream); 1224 1225 int snd_pcm_set_managed_buffer(struct snd_pcm_substream *substream, int type, 1226 struct device *data, size_t size, size_t max); 1227 int snd_pcm_set_managed_buffer_all(struct snd_pcm *pcm, int type, 1228 struct device *data, 1229 size_t size, size_t max); 1230 1231 /** 1232 * snd_pcm_set_fixed_buffer - Preallocate and set up the fixed size PCM buffer 1233 * @substream: the pcm substream instance 1234 * @type: DMA type (SNDRV_DMA_TYPE_*) 1235 * @data: DMA type dependent data 1236 * @size: the requested pre-allocation size in bytes 1237 * 1238 * This is a variant of snd_pcm_set_managed_buffer(), but this pre-allocates 1239 * only the given sized buffer and doesn't allow re-allocation nor dynamic 1240 * allocation of a larger buffer unlike the standard one. 1241 * The function may return -ENOMEM error, hence the caller must check it. 1242 */ 1243 static inline int __must_check 1244 snd_pcm_set_fixed_buffer(struct snd_pcm_substream *substream, int type, 1245 struct device *data, size_t size) 1246 { 1247 return snd_pcm_set_managed_buffer(substream, type, data, size, 0); 1248 } 1249 1250 /** 1251 * snd_pcm_set_fixed_buffer_all - Preallocate and set up the fixed size PCM buffer 1252 * @pcm: the pcm instance 1253 * @type: DMA type (SNDRV_DMA_TYPE_*) 1254 * @data: DMA type dependent data 1255 * @size: the requested pre-allocation size in bytes 1256 * 1257 * Apply the set up of the fixed buffer via snd_pcm_set_fixed_buffer() for 1258 * all substream. If any of allocation fails, it returns -ENOMEM, hence the 1259 * caller must check the return value. 1260 */ 1261 static inline int __must_check 1262 snd_pcm_set_fixed_buffer_all(struct snd_pcm *pcm, int type, 1263 struct device *data, size_t size) 1264 { 1265 return snd_pcm_set_managed_buffer_all(pcm, type, data, size, 0); 1266 } 1267 1268 int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream, 1269 size_t size, gfp_t gfp_flags); 1270 int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream); 1271 struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream, 1272 unsigned long offset); 1273 /** 1274 * snd_pcm_lib_alloc_vmalloc_buffer - allocate virtual DMA buffer 1275 * @substream: the substream to allocate the buffer to 1276 * @size: the requested buffer size, in bytes 1277 * 1278 * Allocates the PCM substream buffer using vmalloc(), i.e., the memory is 1279 * contiguous in kernel virtual space, but not in physical memory. Use this 1280 * if the buffer is accessed by kernel code but not by device DMA. 1281 * 1282 * Return: 1 if the buffer was changed, 0 if not changed, or a negative error 1283 * code. 1284 */ 1285 static inline int snd_pcm_lib_alloc_vmalloc_buffer 1286 (struct snd_pcm_substream *substream, size_t size) 1287 { 1288 return _snd_pcm_lib_alloc_vmalloc_buffer(substream, size, 1289 GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO); 1290 } 1291 1292 /** 1293 * snd_pcm_lib_alloc_vmalloc_32_buffer - allocate 32-bit-addressable buffer 1294 * @substream: the substream to allocate the buffer to 1295 * @size: the requested buffer size, in bytes 1296 * 1297 * This function works like snd_pcm_lib_alloc_vmalloc_buffer(), but uses 1298 * vmalloc_32(), i.e., the pages are allocated from 32-bit-addressable memory. 1299 * 1300 * Return: 1 if the buffer was changed, 0 if not changed, or a negative error 1301 * code. 1302 */ 1303 static inline int snd_pcm_lib_alloc_vmalloc_32_buffer 1304 (struct snd_pcm_substream *substream, size_t size) 1305 { 1306 return _snd_pcm_lib_alloc_vmalloc_buffer(substream, size, 1307 GFP_KERNEL | GFP_DMA32 | __GFP_ZERO); 1308 } 1309 1310 #define snd_pcm_get_dma_buf(substream) ((substream)->runtime->dma_buffer_p) 1311 1312 /** 1313 * snd_pcm_sgbuf_get_addr - Get the DMA address at the corresponding offset 1314 * @substream: PCM substream 1315 * @ofs: byte offset 1316 */ 1317 static inline dma_addr_t 1318 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs) 1319 { 1320 return snd_sgbuf_get_addr(snd_pcm_get_dma_buf(substream), ofs); 1321 } 1322 1323 /** 1324 * snd_pcm_sgbuf_get_chunk_size - Compute the max size that fits within the 1325 * contig. page from the given size 1326 * @substream: PCM substream 1327 * @ofs: byte offset 1328 * @size: byte size to examine 1329 */ 1330 static inline unsigned int 1331 snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream, 1332 unsigned int ofs, unsigned int size) 1333 { 1334 return snd_sgbuf_get_chunk_size(snd_pcm_get_dma_buf(substream), ofs, size); 1335 } 1336 1337 /** 1338 * snd_pcm_mmap_data_open - increase the mmap counter 1339 * @area: VMA 1340 * 1341 * PCM mmap callback should handle this counter properly 1342 */ 1343 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area) 1344 { 1345 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data; 1346 atomic_inc(&substream->mmap_count); 1347 } 1348 1349 /** 1350 * snd_pcm_mmap_data_close - decrease the mmap counter 1351 * @area: VMA 1352 * 1353 * PCM mmap callback should handle this counter properly 1354 */ 1355 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area) 1356 { 1357 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data; 1358 atomic_dec(&substream->mmap_count); 1359 } 1360 1361 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 1362 struct vm_area_struct *area); 1363 /* mmap for io-memory area */ 1364 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 1365 #define SNDRV_PCM_INFO_MMAP_IOMEM SNDRV_PCM_INFO_MMAP 1366 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area); 1367 #else 1368 #define SNDRV_PCM_INFO_MMAP_IOMEM 0 1369 #define snd_pcm_lib_mmap_iomem NULL 1370 #endif 1371 1372 /** 1373 * snd_pcm_limit_isa_dma_size - Get the max size fitting with ISA DMA transfer 1374 * @dma: DMA number 1375 * @max: pointer to store the max size 1376 */ 1377 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max) 1378 { 1379 *max = dma < 4 ? 64 * 1024 : 128 * 1024; 1380 } 1381 1382 /* 1383 * Misc 1384 */ 1385 1386 #define SNDRV_PCM_DEFAULT_CON_SPDIF (IEC958_AES0_CON_EMPHASIS_NONE|\ 1387 (IEC958_AES1_CON_ORIGINAL<<8)|\ 1388 (IEC958_AES1_CON_PCM_CODER<<8)|\ 1389 (IEC958_AES3_CON_FS_48000<<24)) 1390 1391 const char *snd_pcm_format_name(snd_pcm_format_t format); 1392 1393 /** 1394 * snd_pcm_stream_str - Get a string naming the direction of a stream 1395 * @substream: the pcm substream instance 1396 * 1397 * Return: A string naming the direction of the stream. 1398 */ 1399 static inline const char *snd_pcm_stream_str(struct snd_pcm_substream *substream) 1400 { 1401 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 1402 return "Playback"; 1403 else 1404 return "Capture"; 1405 } 1406 1407 /* 1408 * PCM channel-mapping control API 1409 */ 1410 /* array element of channel maps */ 1411 struct snd_pcm_chmap_elem { 1412 unsigned char channels; 1413 unsigned char map[15]; 1414 }; 1415 1416 /* channel map information; retrieved via snd_kcontrol_chip() */ 1417 struct snd_pcm_chmap { 1418 struct snd_pcm *pcm; /* assigned PCM instance */ 1419 int stream; /* PLAYBACK or CAPTURE */ 1420 struct snd_kcontrol *kctl; 1421 const struct snd_pcm_chmap_elem *chmap; 1422 unsigned int max_channels; 1423 unsigned int channel_mask; /* optional: active channels bitmask */ 1424 void *private_data; /* optional: private data pointer */ 1425 }; 1426 1427 /** 1428 * snd_pcm_chmap_substream - get the PCM substream assigned to the given chmap info 1429 * @info: chmap information 1430 * @idx: the substream number index 1431 */ 1432 static inline struct snd_pcm_substream * 1433 snd_pcm_chmap_substream(struct snd_pcm_chmap *info, unsigned int idx) 1434 { 1435 struct snd_pcm_substream *s; 1436 for (s = info->pcm->streams[info->stream].substream; s; s = s->next) 1437 if (s->number == idx) 1438 return s; 1439 return NULL; 1440 } 1441 1442 /* ALSA-standard channel maps (RL/RR prior to C/LFE) */ 1443 extern const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[]; 1444 /* Other world's standard channel maps (C/LFE prior to RL/RR) */ 1445 extern const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[]; 1446 1447 /* bit masks to be passed to snd_pcm_chmap.channel_mask field */ 1448 #define SND_PCM_CHMAP_MASK_24 ((1U << 2) | (1U << 4)) 1449 #define SND_PCM_CHMAP_MASK_246 (SND_PCM_CHMAP_MASK_24 | (1U << 6)) 1450 #define SND_PCM_CHMAP_MASK_2468 (SND_PCM_CHMAP_MASK_246 | (1U << 8)) 1451 1452 int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream, 1453 const struct snd_pcm_chmap_elem *chmap, 1454 int max_channels, 1455 unsigned long private_value, 1456 struct snd_pcm_chmap **info_ret); 1457 1458 /** 1459 * pcm_format_to_bits - Strong-typed conversion of pcm_format to bitwise 1460 * @pcm_format: PCM format 1461 */ 1462 static inline u64 pcm_format_to_bits(snd_pcm_format_t pcm_format) 1463 { 1464 return 1ULL << (__force int) pcm_format; 1465 } 1466 1467 /** 1468 * pcm_for_each_format - helper to iterate for each format type 1469 * @f: the iterator variable in snd_pcm_format_t type 1470 */ 1471 #define pcm_for_each_format(f) \ 1472 for ((f) = SNDRV_PCM_FORMAT_FIRST; \ 1473 (__force int)(f) <= (__force int)SNDRV_PCM_FORMAT_LAST; \ 1474 (f) = (__force snd_pcm_format_t)((__force int)(f) + 1)) 1475 1476 /* printk helpers */ 1477 #define pcm_err(pcm, fmt, args...) \ 1478 dev_err((pcm)->card->dev, fmt, ##args) 1479 #define pcm_warn(pcm, fmt, args...) \ 1480 dev_warn((pcm)->card->dev, fmt, ##args) 1481 #define pcm_dbg(pcm, fmt, args...) \ 1482 dev_dbg((pcm)->card->dev, fmt, ##args) 1483 1484 struct snd_pcm_status64 { 1485 snd_pcm_state_t state; /* stream state */ 1486 u8 rsvd[4]; 1487 s64 trigger_tstamp_sec; /* time when stream was started/stopped/paused */ 1488 s64 trigger_tstamp_nsec; 1489 s64 tstamp_sec; /* reference timestamp */ 1490 s64 tstamp_nsec; 1491 snd_pcm_uframes_t appl_ptr; /* appl ptr */ 1492 snd_pcm_uframes_t hw_ptr; /* hw ptr */ 1493 snd_pcm_sframes_t delay; /* current delay in frames */ 1494 snd_pcm_uframes_t avail; /* number of frames available */ 1495 snd_pcm_uframes_t avail_max; /* max frames available on hw since last status */ 1496 snd_pcm_uframes_t overrange; /* count of ADC (capture) overrange detections from last status */ 1497 snd_pcm_state_t suspended_state; /* suspended stream state */ 1498 __u32 audio_tstamp_data; /* needed for 64-bit alignment, used for configs/report to/from userspace */ 1499 s64 audio_tstamp_sec; /* sample counter, wall clock, PHC or on-demand sync'ed */ 1500 s64 audio_tstamp_nsec; 1501 s64 driver_tstamp_sec; /* useful in case reference system tstamp is reported with delay */ 1502 s64 driver_tstamp_nsec; 1503 __u32 audio_tstamp_accuracy; /* in ns units, only valid if indicated in audio_tstamp_data */ 1504 unsigned char reserved[52-4*sizeof(s64)]; /* must be filled with zero */ 1505 }; 1506 1507 #define SNDRV_PCM_IOCTL_STATUS64 _IOR('A', 0x20, struct snd_pcm_status64) 1508 #define SNDRV_PCM_IOCTL_STATUS_EXT64 _IOWR('A', 0x24, struct snd_pcm_status64) 1509 1510 struct snd_pcm_status32 { 1511 snd_pcm_state_t state; /* stream state */ 1512 s32 trigger_tstamp_sec; /* time when stream was started/stopped/paused */ 1513 s32 trigger_tstamp_nsec; 1514 s32 tstamp_sec; /* reference timestamp */ 1515 s32 tstamp_nsec; 1516 u32 appl_ptr; /* appl ptr */ 1517 u32 hw_ptr; /* hw ptr */ 1518 s32 delay; /* current delay in frames */ 1519 u32 avail; /* number of frames available */ 1520 u32 avail_max; /* max frames available on hw since last status */ 1521 u32 overrange; /* count of ADC (capture) overrange detections from last status */ 1522 snd_pcm_state_t suspended_state; /* suspended stream state */ 1523 u32 audio_tstamp_data; /* needed for 64-bit alignment, used for configs/report to/from userspace */ 1524 s32 audio_tstamp_sec; /* sample counter, wall clock, PHC or on-demand sync'ed */ 1525 s32 audio_tstamp_nsec; 1526 s32 driver_tstamp_sec; /* useful in case reference system tstamp is reported with delay */ 1527 s32 driver_tstamp_nsec; 1528 u32 audio_tstamp_accuracy; /* in ns units, only valid if indicated in audio_tstamp_data */ 1529 unsigned char reserved[52-4*sizeof(s32)]; /* must be filled with zero */ 1530 }; 1531 1532 #define SNDRV_PCM_IOCTL_STATUS32 _IOR('A', 0x20, struct snd_pcm_status32) 1533 #define SNDRV_PCM_IOCTL_STATUS_EXT32 _IOWR('A', 0x24, struct snd_pcm_status32) 1534 1535 #endif /* __SOUND_PCM_H */ 1536