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 struct mutex buffer_mutex; /* protect for buffer changes */ 405 406 /* -- private section -- */ 407 void *private_data; 408 void (*private_free)(struct snd_pcm_runtime *runtime); 409 410 /* -- hardware description -- */ 411 struct snd_pcm_hardware hw; 412 struct snd_pcm_hw_constraints hw_constraints; 413 414 /* -- timer -- */ 415 unsigned int timer_resolution; /* timer resolution */ 416 int tstamp_type; /* timestamp type */ 417 418 /* -- DMA -- */ 419 unsigned char *dma_area; /* DMA area */ 420 dma_addr_t dma_addr; /* physical bus address (not accessible from main CPU) */ 421 size_t dma_bytes; /* size of DMA area */ 422 423 struct snd_dma_buffer *dma_buffer_p; /* allocated buffer */ 424 unsigned int buffer_changed:1; /* buffer allocation changed; set only in managed mode */ 425 426 /* -- audio timestamp config -- */ 427 struct snd_pcm_audio_tstamp_config audio_tstamp_config; 428 struct snd_pcm_audio_tstamp_report audio_tstamp_report; 429 struct timespec64 driver_tstamp; 430 431 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 432 /* -- OSS things -- */ 433 struct snd_pcm_oss_runtime oss; 434 #endif 435 }; 436 437 struct snd_pcm_group { /* keep linked substreams */ 438 spinlock_t lock; 439 struct mutex mutex; 440 struct list_head substreams; 441 refcount_t refs; 442 }; 443 444 struct pid; 445 446 struct snd_pcm_substream { 447 struct snd_pcm *pcm; 448 struct snd_pcm_str *pstr; 449 void *private_data; /* copied from pcm->private_data */ 450 int number; 451 char name[32]; /* substream name */ 452 int stream; /* stream (direction) */ 453 struct pm_qos_request latency_pm_qos_req; /* pm_qos request */ 454 size_t buffer_bytes_max; /* limit ring buffer size */ 455 struct snd_dma_buffer dma_buffer; 456 size_t dma_max; 457 /* -- hardware operations -- */ 458 const struct snd_pcm_ops *ops; 459 /* -- runtime information -- */ 460 struct snd_pcm_runtime *runtime; 461 /* -- timer section -- */ 462 struct snd_timer *timer; /* timer */ 463 unsigned timer_running: 1; /* time is running */ 464 long wait_time; /* time in ms for R/W to wait for avail */ 465 /* -- next substream -- */ 466 struct snd_pcm_substream *next; 467 /* -- linked substreams -- */ 468 struct list_head link_list; /* linked list member */ 469 struct snd_pcm_group self_group; /* fake group for non linked substream (with substream lock inside) */ 470 struct snd_pcm_group *group; /* pointer to current group */ 471 /* -- assigned files -- */ 472 int ref_count; 473 atomic_t mmap_count; 474 unsigned int f_flags; 475 void (*pcm_release)(struct snd_pcm_substream *); 476 struct pid *pid; 477 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 478 /* -- OSS things -- */ 479 struct snd_pcm_oss_substream oss; 480 #endif 481 #ifdef CONFIG_SND_VERBOSE_PROCFS 482 struct snd_info_entry *proc_root; 483 #endif /* CONFIG_SND_VERBOSE_PROCFS */ 484 /* misc flags */ 485 unsigned int hw_opened: 1; 486 unsigned int managed_buffer_alloc:1; 487 }; 488 489 #define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0) 490 491 492 struct snd_pcm_str { 493 int stream; /* stream (direction) */ 494 struct snd_pcm *pcm; 495 /* -- substreams -- */ 496 unsigned int substream_count; 497 unsigned int substream_opened; 498 struct snd_pcm_substream *substream; 499 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 500 /* -- OSS things -- */ 501 struct snd_pcm_oss_stream oss; 502 #endif 503 #ifdef CONFIG_SND_VERBOSE_PROCFS 504 struct snd_info_entry *proc_root; 505 #ifdef CONFIG_SND_PCM_XRUN_DEBUG 506 unsigned int xrun_debug; /* 0 = disabled, 1 = verbose, 2 = stacktrace */ 507 #endif 508 #endif 509 struct snd_kcontrol *chmap_kctl; /* channel-mapping controls */ 510 struct device dev; 511 }; 512 513 struct snd_pcm { 514 struct snd_card *card; 515 struct list_head list; 516 int device; /* device number */ 517 unsigned int info_flags; 518 unsigned short dev_class; 519 unsigned short dev_subclass; 520 char id[64]; 521 char name[80]; 522 struct snd_pcm_str streams[2]; 523 struct mutex open_mutex; 524 wait_queue_head_t open_wait; 525 void *private_data; 526 void (*private_free) (struct snd_pcm *pcm); 527 bool internal; /* pcm is for internal use only */ 528 bool nonatomic; /* whole PCM operations are in non-atomic context */ 529 bool no_device_suspend; /* don't invoke device PM suspend */ 530 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 531 struct snd_pcm_oss oss; 532 #endif 533 }; 534 535 /* 536 * Registering 537 */ 538 539 extern const struct file_operations snd_pcm_f_ops[2]; 540 541 int snd_pcm_new(struct snd_card *card, const char *id, int device, 542 int playback_count, int capture_count, 543 struct snd_pcm **rpcm); 544 int snd_pcm_new_internal(struct snd_card *card, const char *id, int device, 545 int playback_count, int capture_count, 546 struct snd_pcm **rpcm); 547 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count); 548 549 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 550 struct snd_pcm_notify { 551 int (*n_register) (struct snd_pcm * pcm); 552 int (*n_disconnect) (struct snd_pcm * pcm); 553 int (*n_unregister) (struct snd_pcm * pcm); 554 struct list_head list; 555 }; 556 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree); 557 #endif 558 559 /* 560 * Native I/O 561 */ 562 563 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info); 564 int snd_pcm_info_user(struct snd_pcm_substream *substream, 565 struct snd_pcm_info __user *info); 566 int snd_pcm_status64(struct snd_pcm_substream *substream, 567 struct snd_pcm_status64 *status); 568 int snd_pcm_start(struct snd_pcm_substream *substream); 569 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t status); 570 int snd_pcm_drain_done(struct snd_pcm_substream *substream); 571 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream); 572 #ifdef CONFIG_PM 573 int snd_pcm_suspend_all(struct snd_pcm *pcm); 574 #else 575 static inline int snd_pcm_suspend_all(struct snd_pcm *pcm) 576 { 577 return 0; 578 } 579 #endif 580 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg); 581 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file, 582 struct snd_pcm_substream **rsubstream); 583 void snd_pcm_release_substream(struct snd_pcm_substream *substream); 584 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file, 585 struct snd_pcm_substream **rsubstream); 586 void snd_pcm_detach_substream(struct snd_pcm_substream *substream); 587 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area); 588 589 590 #ifdef CONFIG_SND_DEBUG 591 void snd_pcm_debug_name(struct snd_pcm_substream *substream, 592 char *name, size_t len); 593 #else 594 static inline void 595 snd_pcm_debug_name(struct snd_pcm_substream *substream, char *buf, size_t size) 596 { 597 *buf = 0; 598 } 599 #endif 600 601 /* 602 * PCM library 603 */ 604 605 /** 606 * snd_pcm_stream_linked - Check whether the substream is linked with others 607 * @substream: substream to check 608 * 609 * Returns true if the given substream is being linked with others. 610 */ 611 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream) 612 { 613 return substream->group != &substream->self_group; 614 } 615 616 void snd_pcm_stream_lock(struct snd_pcm_substream *substream); 617 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream); 618 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream); 619 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream); 620 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream); 621 unsigned long _snd_pcm_stream_lock_irqsave_nested(struct snd_pcm_substream *substream); 622 623 /** 624 * snd_pcm_stream_lock_irqsave - Lock the PCM stream 625 * @substream: PCM substream 626 * @flags: irq flags 627 * 628 * This locks the PCM stream like snd_pcm_stream_lock() but with the local 629 * IRQ (only when nonatomic is false). In nonatomic case, this is identical 630 * as snd_pcm_stream_lock(). 631 */ 632 #define snd_pcm_stream_lock_irqsave(substream, flags) \ 633 do { \ 634 typecheck(unsigned long, flags); \ 635 flags = _snd_pcm_stream_lock_irqsave(substream); \ 636 } while (0) 637 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream, 638 unsigned long flags); 639 640 /** 641 * snd_pcm_stream_lock_irqsave_nested - Single-nested PCM stream locking 642 * @substream: PCM substream 643 * @flags: irq flags 644 * 645 * This locks the PCM stream like snd_pcm_stream_lock_irqsave() but with 646 * the single-depth lockdep subclass. 647 */ 648 #define snd_pcm_stream_lock_irqsave_nested(substream, flags) \ 649 do { \ 650 typecheck(unsigned long, flags); \ 651 flags = _snd_pcm_stream_lock_irqsave_nested(substream); \ 652 } while (0) 653 654 /** 655 * snd_pcm_group_for_each_entry - iterate over the linked substreams 656 * @s: the iterator 657 * @substream: the substream 658 * 659 * Iterate over the all linked substreams to the given @substream. 660 * When @substream isn't linked with any others, this gives returns @substream 661 * itself once. 662 */ 663 #define snd_pcm_group_for_each_entry(s, substream) \ 664 list_for_each_entry(s, &substream->group->substreams, link_list) 665 666 #define for_each_pcm_streams(stream) \ 667 for (stream = SNDRV_PCM_STREAM_PLAYBACK; \ 668 stream <= SNDRV_PCM_STREAM_LAST; \ 669 stream++) 670 671 /** 672 * snd_pcm_running - Check whether the substream is in a running state 673 * @substream: substream to check 674 * 675 * Returns true if the given substream is in the state RUNNING, or in the 676 * state DRAINING for playback. 677 */ 678 static inline int snd_pcm_running(struct snd_pcm_substream *substream) 679 { 680 return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING || 681 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING && 682 substream->stream == SNDRV_PCM_STREAM_PLAYBACK)); 683 } 684 685 /** 686 * bytes_to_samples - Unit conversion of the size from bytes to samples 687 * @runtime: PCM runtime instance 688 * @size: size in bytes 689 */ 690 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size) 691 { 692 return size * 8 / runtime->sample_bits; 693 } 694 695 /** 696 * bytes_to_frames - Unit conversion of the size from bytes to frames 697 * @runtime: PCM runtime instance 698 * @size: size in bytes 699 */ 700 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size) 701 { 702 return size * 8 / runtime->frame_bits; 703 } 704 705 /** 706 * samples_to_bytes - Unit conversion of the size from samples to bytes 707 * @runtime: PCM runtime instance 708 * @size: size in samples 709 */ 710 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size) 711 { 712 return size * runtime->sample_bits / 8; 713 } 714 715 /** 716 * frames_to_bytes - Unit conversion of the size from frames to bytes 717 * @runtime: PCM runtime instance 718 * @size: size in frames 719 */ 720 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size) 721 { 722 return size * runtime->frame_bits / 8; 723 } 724 725 /** 726 * frame_aligned - Check whether the byte size is aligned to frames 727 * @runtime: PCM runtime instance 728 * @bytes: size in bytes 729 */ 730 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes) 731 { 732 return bytes % runtime->byte_align == 0; 733 } 734 735 /** 736 * snd_pcm_lib_buffer_bytes - Get the buffer size of the current PCM in bytes 737 * @substream: PCM substream 738 */ 739 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream) 740 { 741 struct snd_pcm_runtime *runtime = substream->runtime; 742 return frames_to_bytes(runtime, runtime->buffer_size); 743 } 744 745 /** 746 * snd_pcm_lib_period_bytes - Get the period size of the current PCM in bytes 747 * @substream: PCM substream 748 */ 749 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream) 750 { 751 struct snd_pcm_runtime *runtime = substream->runtime; 752 return frames_to_bytes(runtime, runtime->period_size); 753 } 754 755 /** 756 * snd_pcm_playback_avail - Get the available (writable) space for playback 757 * @runtime: PCM runtime instance 758 * 759 * Result is between 0 ... (boundary - 1) 760 */ 761 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime) 762 { 763 snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr; 764 if (avail < 0) 765 avail += runtime->boundary; 766 else if ((snd_pcm_uframes_t) avail >= runtime->boundary) 767 avail -= runtime->boundary; 768 return avail; 769 } 770 771 /** 772 * snd_pcm_capture_avail - Get the available (readable) space for capture 773 * @runtime: PCM runtime instance 774 * 775 * Result is between 0 ... (boundary - 1) 776 */ 777 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime) 778 { 779 snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr; 780 if (avail < 0) 781 avail += runtime->boundary; 782 return avail; 783 } 784 785 /** 786 * snd_pcm_playback_hw_avail - Get the queued space for playback 787 * @runtime: PCM runtime instance 788 */ 789 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime) 790 { 791 return runtime->buffer_size - snd_pcm_playback_avail(runtime); 792 } 793 794 /** 795 * snd_pcm_capture_hw_avail - Get the free space for capture 796 * @runtime: PCM runtime instance 797 */ 798 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime) 799 { 800 return runtime->buffer_size - snd_pcm_capture_avail(runtime); 801 } 802 803 /** 804 * snd_pcm_playback_ready - check whether the playback buffer is available 805 * @substream: the pcm substream instance 806 * 807 * Checks whether enough free space is available on the playback buffer. 808 * 809 * Return: Non-zero if available, or zero if not. 810 */ 811 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream) 812 { 813 struct snd_pcm_runtime *runtime = substream->runtime; 814 return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min; 815 } 816 817 /** 818 * snd_pcm_capture_ready - check whether the capture buffer is available 819 * @substream: the pcm substream instance 820 * 821 * Checks whether enough capture data is available on the capture buffer. 822 * 823 * Return: Non-zero if available, or zero if not. 824 */ 825 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream) 826 { 827 struct snd_pcm_runtime *runtime = substream->runtime; 828 return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min; 829 } 830 831 /** 832 * snd_pcm_playback_data - check whether any data exists on the playback buffer 833 * @substream: the pcm substream instance 834 * 835 * Checks whether any data exists on the playback buffer. 836 * 837 * Return: Non-zero if any data exists, or zero if not. If stop_threshold 838 * is bigger or equal to boundary, then this function returns always non-zero. 839 */ 840 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream) 841 { 842 struct snd_pcm_runtime *runtime = substream->runtime; 843 844 if (runtime->stop_threshold >= runtime->boundary) 845 return 1; 846 return snd_pcm_playback_avail(runtime) < runtime->buffer_size; 847 } 848 849 /** 850 * snd_pcm_playback_empty - check whether the playback buffer is empty 851 * @substream: the pcm substream instance 852 * 853 * Checks whether the playback buffer is empty. 854 * 855 * Return: Non-zero if empty, or zero if not. 856 */ 857 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream) 858 { 859 struct snd_pcm_runtime *runtime = substream->runtime; 860 return snd_pcm_playback_avail(runtime) >= runtime->buffer_size; 861 } 862 863 /** 864 * snd_pcm_capture_empty - check whether the capture buffer is empty 865 * @substream: the pcm substream instance 866 * 867 * Checks whether the capture buffer is empty. 868 * 869 * Return: Non-zero if empty, or zero if not. 870 */ 871 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream) 872 { 873 struct snd_pcm_runtime *runtime = substream->runtime; 874 return snd_pcm_capture_avail(runtime) == 0; 875 } 876 877 /** 878 * snd_pcm_trigger_done - Mark the master substream 879 * @substream: the pcm substream instance 880 * @master: the linked master substream 881 * 882 * When multiple substreams of the same card are linked and the hardware 883 * supports the single-shot operation, the driver calls this in the loop 884 * in snd_pcm_group_for_each_entry() for marking the substream as "done". 885 * Then most of trigger operations are performed only to the given master 886 * substream. 887 * 888 * The trigger_master mark is cleared at timestamp updates at the end 889 * of trigger operations. 890 */ 891 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream, 892 struct snd_pcm_substream *master) 893 { 894 substream->runtime->trigger_master = master; 895 } 896 897 static inline int hw_is_mask(int var) 898 { 899 return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK && 900 var <= SNDRV_PCM_HW_PARAM_LAST_MASK; 901 } 902 903 static inline int hw_is_interval(int var) 904 { 905 return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL && 906 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; 907 } 908 909 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params, 910 snd_pcm_hw_param_t var) 911 { 912 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK]; 913 } 914 915 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params, 916 snd_pcm_hw_param_t var) 917 { 918 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL]; 919 } 920 921 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params, 922 snd_pcm_hw_param_t var) 923 { 924 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK]; 925 } 926 927 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params, 928 snd_pcm_hw_param_t var) 929 { 930 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL]; 931 } 932 933 /** 934 * params_channels - Get the number of channels from the hw params 935 * @p: hw params 936 */ 937 static inline unsigned int params_channels(const struct snd_pcm_hw_params *p) 938 { 939 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_CHANNELS)->min; 940 } 941 942 /** 943 * params_rate - Get the sample rate from the hw params 944 * @p: hw params 945 */ 946 static inline unsigned int params_rate(const struct snd_pcm_hw_params *p) 947 { 948 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_RATE)->min; 949 } 950 951 /** 952 * params_period_size - Get the period size (in frames) from the hw params 953 * @p: hw params 954 */ 955 static inline unsigned int params_period_size(const struct snd_pcm_hw_params *p) 956 { 957 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min; 958 } 959 960 /** 961 * params_periods - Get the number of periods from the hw params 962 * @p: hw params 963 */ 964 static inline unsigned int params_periods(const struct snd_pcm_hw_params *p) 965 { 966 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIODS)->min; 967 } 968 969 /** 970 * params_buffer_size - Get the buffer size (in frames) from the hw params 971 * @p: hw params 972 */ 973 static inline unsigned int params_buffer_size(const struct snd_pcm_hw_params *p) 974 { 975 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min; 976 } 977 978 /** 979 * params_buffer_bytes - Get the buffer size (in bytes) from the hw params 980 * @p: hw params 981 */ 982 static inline unsigned int params_buffer_bytes(const struct snd_pcm_hw_params *p) 983 { 984 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min; 985 } 986 987 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v); 988 int snd_interval_list(struct snd_interval *i, unsigned int count, 989 const unsigned int *list, unsigned int mask); 990 int snd_interval_ranges(struct snd_interval *i, unsigned int count, 991 const struct snd_interval *list, unsigned int mask); 992 int snd_interval_ratnum(struct snd_interval *i, 993 unsigned int rats_count, const struct snd_ratnum *rats, 994 unsigned int *nump, unsigned int *denp); 995 996 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params); 997 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var); 998 999 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params); 1000 1001 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, 1002 u_int64_t mask); 1003 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, 1004 unsigned int min, unsigned int max); 1005 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var); 1006 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime, 1007 unsigned int cond, 1008 snd_pcm_hw_param_t var, 1009 const struct snd_pcm_hw_constraint_list *l); 1010 int snd_pcm_hw_constraint_ranges(struct snd_pcm_runtime *runtime, 1011 unsigned int cond, 1012 snd_pcm_hw_param_t var, 1013 const struct snd_pcm_hw_constraint_ranges *r); 1014 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime, 1015 unsigned int cond, 1016 snd_pcm_hw_param_t var, 1017 const struct snd_pcm_hw_constraint_ratnums *r); 1018 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime, 1019 unsigned int cond, 1020 snd_pcm_hw_param_t var, 1021 const struct snd_pcm_hw_constraint_ratdens *r); 1022 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime, 1023 unsigned int cond, 1024 unsigned int width, 1025 unsigned int msbits); 1026 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime, 1027 unsigned int cond, 1028 snd_pcm_hw_param_t var, 1029 unsigned long step); 1030 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime, 1031 unsigned int cond, 1032 snd_pcm_hw_param_t var); 1033 int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime, 1034 unsigned int base_rate); 1035 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, 1036 unsigned int cond, 1037 int var, 1038 snd_pcm_hw_rule_func_t func, void *private, 1039 int dep, ...); 1040 1041 /** 1042 * snd_pcm_hw_constraint_single() - Constrain parameter to a single value 1043 * @runtime: PCM runtime instance 1044 * @var: The hw_params variable to constrain 1045 * @val: The value to constrain to 1046 * 1047 * Return: Positive if the value is changed, zero if it's not changed, or a 1048 * negative error code. 1049 */ 1050 static inline int snd_pcm_hw_constraint_single( 1051 struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, 1052 unsigned int val) 1053 { 1054 return snd_pcm_hw_constraint_minmax(runtime, var, val, val); 1055 } 1056 1057 int snd_pcm_format_signed(snd_pcm_format_t format); 1058 int snd_pcm_format_unsigned(snd_pcm_format_t format); 1059 int snd_pcm_format_linear(snd_pcm_format_t format); 1060 int snd_pcm_format_little_endian(snd_pcm_format_t format); 1061 int snd_pcm_format_big_endian(snd_pcm_format_t format); 1062 #if 0 /* just for kernel-doc */ 1063 /** 1064 * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian 1065 * @format: the format to check 1066 * 1067 * Return: 1 if the given PCM format is CPU-endian, 0 if 1068 * opposite, or a negative error code if endian not specified. 1069 */ 1070 int snd_pcm_format_cpu_endian(snd_pcm_format_t format); 1071 #endif /* DocBook */ 1072 #ifdef SNDRV_LITTLE_ENDIAN 1073 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format) 1074 #else 1075 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format) 1076 #endif 1077 int snd_pcm_format_width(snd_pcm_format_t format); /* in bits */ 1078 int snd_pcm_format_physical_width(snd_pcm_format_t format); /* in bits */ 1079 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples); 1080 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format); 1081 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames); 1082 1083 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction, 1084 const struct snd_pcm_ops *ops); 1085 void snd_pcm_set_sync(struct snd_pcm_substream *substream); 1086 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream, 1087 unsigned int cmd, void *arg); 1088 void snd_pcm_period_elapsed_under_stream_lock(struct snd_pcm_substream *substream); 1089 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream); 1090 snd_pcm_sframes_t __snd_pcm_lib_xfer(struct snd_pcm_substream *substream, 1091 void *buf, bool interleaved, 1092 snd_pcm_uframes_t frames, bool in_kernel); 1093 1094 static inline snd_pcm_sframes_t 1095 snd_pcm_lib_write(struct snd_pcm_substream *substream, 1096 const void __user *buf, snd_pcm_uframes_t frames) 1097 { 1098 return __snd_pcm_lib_xfer(substream, (void __force *)buf, true, frames, false); 1099 } 1100 1101 static inline snd_pcm_sframes_t 1102 snd_pcm_lib_read(struct snd_pcm_substream *substream, 1103 void __user *buf, snd_pcm_uframes_t frames) 1104 { 1105 return __snd_pcm_lib_xfer(substream, (void __force *)buf, true, frames, false); 1106 } 1107 1108 static inline snd_pcm_sframes_t 1109 snd_pcm_lib_writev(struct snd_pcm_substream *substream, 1110 void __user **bufs, snd_pcm_uframes_t frames) 1111 { 1112 return __snd_pcm_lib_xfer(substream, (void *)bufs, false, frames, false); 1113 } 1114 1115 static inline snd_pcm_sframes_t 1116 snd_pcm_lib_readv(struct snd_pcm_substream *substream, 1117 void __user **bufs, snd_pcm_uframes_t frames) 1118 { 1119 return __snd_pcm_lib_xfer(substream, (void *)bufs, false, frames, false); 1120 } 1121 1122 static inline snd_pcm_sframes_t 1123 snd_pcm_kernel_write(struct snd_pcm_substream *substream, 1124 const void *buf, snd_pcm_uframes_t frames) 1125 { 1126 return __snd_pcm_lib_xfer(substream, (void *)buf, true, frames, true); 1127 } 1128 1129 static inline snd_pcm_sframes_t 1130 snd_pcm_kernel_read(struct snd_pcm_substream *substream, 1131 void *buf, snd_pcm_uframes_t frames) 1132 { 1133 return __snd_pcm_lib_xfer(substream, buf, true, frames, true); 1134 } 1135 1136 static inline snd_pcm_sframes_t 1137 snd_pcm_kernel_writev(struct snd_pcm_substream *substream, 1138 void **bufs, snd_pcm_uframes_t frames) 1139 { 1140 return __snd_pcm_lib_xfer(substream, bufs, false, frames, true); 1141 } 1142 1143 static inline snd_pcm_sframes_t 1144 snd_pcm_kernel_readv(struct snd_pcm_substream *substream, 1145 void **bufs, snd_pcm_uframes_t frames) 1146 { 1147 return __snd_pcm_lib_xfer(substream, bufs, false, frames, true); 1148 } 1149 1150 int snd_pcm_hw_limit_rates(struct snd_pcm_hardware *hw); 1151 1152 static inline int 1153 snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime) 1154 { 1155 return snd_pcm_hw_limit_rates(&runtime->hw); 1156 } 1157 1158 unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate); 1159 unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit); 1160 unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a, 1161 unsigned int rates_b); 1162 unsigned int snd_pcm_rate_range_to_bits(unsigned int rate_min, 1163 unsigned int rate_max); 1164 1165 /** 1166 * snd_pcm_set_runtime_buffer - Set the PCM runtime buffer 1167 * @substream: PCM substream to set 1168 * @bufp: the buffer information, NULL to clear 1169 * 1170 * Copy the buffer information to runtime->dma_buffer when @bufp is non-NULL. 1171 * Otherwise it clears the current buffer information. 1172 */ 1173 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream, 1174 struct snd_dma_buffer *bufp) 1175 { 1176 struct snd_pcm_runtime *runtime = substream->runtime; 1177 if (bufp) { 1178 runtime->dma_buffer_p = bufp; 1179 runtime->dma_area = bufp->area; 1180 runtime->dma_addr = bufp->addr; 1181 runtime->dma_bytes = bufp->bytes; 1182 } else { 1183 runtime->dma_buffer_p = NULL; 1184 runtime->dma_area = NULL; 1185 runtime->dma_addr = 0; 1186 runtime->dma_bytes = 0; 1187 } 1188 } 1189 1190 /** 1191 * snd_pcm_gettime - Fill the timespec64 depending on the timestamp mode 1192 * @runtime: PCM runtime instance 1193 * @tv: timespec64 to fill 1194 */ 1195 static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime, 1196 struct timespec64 *tv) 1197 { 1198 switch (runtime->tstamp_type) { 1199 case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC: 1200 ktime_get_ts64(tv); 1201 break; 1202 case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC_RAW: 1203 ktime_get_raw_ts64(tv); 1204 break; 1205 default: 1206 ktime_get_real_ts64(tv); 1207 break; 1208 } 1209 } 1210 1211 /* 1212 * Memory 1213 */ 1214 1215 void snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream); 1216 void snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm); 1217 void snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream, 1218 int type, struct device *data, 1219 size_t size, size_t max); 1220 void snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm, 1221 int type, void *data, 1222 size_t size, size_t max); 1223 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size); 1224 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream); 1225 1226 int snd_pcm_set_managed_buffer(struct snd_pcm_substream *substream, int type, 1227 struct device *data, size_t size, size_t max); 1228 int snd_pcm_set_managed_buffer_all(struct snd_pcm *pcm, int type, 1229 struct device *data, 1230 size_t size, size_t max); 1231 1232 /** 1233 * snd_pcm_set_fixed_buffer - Preallocate and set up the fixed size PCM buffer 1234 * @substream: the pcm substream instance 1235 * @type: DMA type (SNDRV_DMA_TYPE_*) 1236 * @data: DMA type dependent data 1237 * @size: the requested pre-allocation size in bytes 1238 * 1239 * This is a variant of snd_pcm_set_managed_buffer(), but this pre-allocates 1240 * only the given sized buffer and doesn't allow re-allocation nor dynamic 1241 * allocation of a larger buffer unlike the standard one. 1242 * The function may return -ENOMEM error, hence the caller must check it. 1243 */ 1244 static inline int __must_check 1245 snd_pcm_set_fixed_buffer(struct snd_pcm_substream *substream, int type, 1246 struct device *data, size_t size) 1247 { 1248 return snd_pcm_set_managed_buffer(substream, type, data, size, 0); 1249 } 1250 1251 /** 1252 * snd_pcm_set_fixed_buffer_all - Preallocate and set up the fixed size PCM buffer 1253 * @pcm: the pcm instance 1254 * @type: DMA type (SNDRV_DMA_TYPE_*) 1255 * @data: DMA type dependent data 1256 * @size: the requested pre-allocation size in bytes 1257 * 1258 * Apply the set up of the fixed buffer via snd_pcm_set_fixed_buffer() for 1259 * all substream. If any of allocation fails, it returns -ENOMEM, hence the 1260 * caller must check the return value. 1261 */ 1262 static inline int __must_check 1263 snd_pcm_set_fixed_buffer_all(struct snd_pcm *pcm, int type, 1264 struct device *data, size_t size) 1265 { 1266 return snd_pcm_set_managed_buffer_all(pcm, type, data, size, 0); 1267 } 1268 1269 int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream, 1270 size_t size, gfp_t gfp_flags); 1271 int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream); 1272 struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream, 1273 unsigned long offset); 1274 /** 1275 * snd_pcm_lib_alloc_vmalloc_buffer - allocate virtual DMA buffer 1276 * @substream: the substream to allocate the buffer to 1277 * @size: the requested buffer size, in bytes 1278 * 1279 * Allocates the PCM substream buffer using vmalloc(), i.e., the memory is 1280 * contiguous in kernel virtual space, but not in physical memory. Use this 1281 * if the buffer is accessed by kernel code but not by device DMA. 1282 * 1283 * Return: 1 if the buffer was changed, 0 if not changed, or a negative error 1284 * code. 1285 */ 1286 static inline int snd_pcm_lib_alloc_vmalloc_buffer 1287 (struct snd_pcm_substream *substream, size_t size) 1288 { 1289 return _snd_pcm_lib_alloc_vmalloc_buffer(substream, size, 1290 GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO); 1291 } 1292 1293 /** 1294 * snd_pcm_lib_alloc_vmalloc_32_buffer - allocate 32-bit-addressable buffer 1295 * @substream: the substream to allocate the buffer to 1296 * @size: the requested buffer size, in bytes 1297 * 1298 * This function works like snd_pcm_lib_alloc_vmalloc_buffer(), but uses 1299 * vmalloc_32(), i.e., the pages are allocated from 32-bit-addressable memory. 1300 * 1301 * Return: 1 if the buffer was changed, 0 if not changed, or a negative error 1302 * code. 1303 */ 1304 static inline int snd_pcm_lib_alloc_vmalloc_32_buffer 1305 (struct snd_pcm_substream *substream, size_t size) 1306 { 1307 return _snd_pcm_lib_alloc_vmalloc_buffer(substream, size, 1308 GFP_KERNEL | GFP_DMA32 | __GFP_ZERO); 1309 } 1310 1311 #define snd_pcm_get_dma_buf(substream) ((substream)->runtime->dma_buffer_p) 1312 1313 /** 1314 * snd_pcm_sgbuf_get_addr - Get the DMA address at the corresponding offset 1315 * @substream: PCM substream 1316 * @ofs: byte offset 1317 */ 1318 static inline dma_addr_t 1319 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs) 1320 { 1321 return snd_sgbuf_get_addr(snd_pcm_get_dma_buf(substream), ofs); 1322 } 1323 1324 /** 1325 * snd_pcm_sgbuf_get_chunk_size - Compute the max size that fits within the 1326 * contig. page from the given size 1327 * @substream: PCM substream 1328 * @ofs: byte offset 1329 * @size: byte size to examine 1330 */ 1331 static inline unsigned int 1332 snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream, 1333 unsigned int ofs, unsigned int size) 1334 { 1335 return snd_sgbuf_get_chunk_size(snd_pcm_get_dma_buf(substream), ofs, size); 1336 } 1337 1338 /** 1339 * snd_pcm_mmap_data_open - increase the mmap counter 1340 * @area: VMA 1341 * 1342 * PCM mmap callback should handle this counter properly 1343 */ 1344 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area) 1345 { 1346 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data; 1347 atomic_inc(&substream->mmap_count); 1348 } 1349 1350 /** 1351 * snd_pcm_mmap_data_close - decrease the mmap counter 1352 * @area: VMA 1353 * 1354 * PCM mmap callback should handle this counter properly 1355 */ 1356 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area) 1357 { 1358 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data; 1359 atomic_dec(&substream->mmap_count); 1360 } 1361 1362 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 1363 struct vm_area_struct *area); 1364 /* mmap for io-memory area */ 1365 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 1366 #define SNDRV_PCM_INFO_MMAP_IOMEM SNDRV_PCM_INFO_MMAP 1367 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area); 1368 #else 1369 #define SNDRV_PCM_INFO_MMAP_IOMEM 0 1370 #define snd_pcm_lib_mmap_iomem NULL 1371 #endif 1372 1373 /** 1374 * snd_pcm_limit_isa_dma_size - Get the max size fitting with ISA DMA transfer 1375 * @dma: DMA number 1376 * @max: pointer to store the max size 1377 */ 1378 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max) 1379 { 1380 *max = dma < 4 ? 64 * 1024 : 128 * 1024; 1381 } 1382 1383 /* 1384 * Misc 1385 */ 1386 1387 #define SNDRV_PCM_DEFAULT_CON_SPDIF (IEC958_AES0_CON_EMPHASIS_NONE|\ 1388 (IEC958_AES1_CON_ORIGINAL<<8)|\ 1389 (IEC958_AES1_CON_PCM_CODER<<8)|\ 1390 (IEC958_AES3_CON_FS_48000<<24)) 1391 1392 const char *snd_pcm_format_name(snd_pcm_format_t format); 1393 1394 /** 1395 * snd_pcm_stream_str - Get a string naming the direction of a stream 1396 * @substream: the pcm substream instance 1397 * 1398 * Return: A string naming the direction of the stream. 1399 */ 1400 static inline const char *snd_pcm_stream_str(struct snd_pcm_substream *substream) 1401 { 1402 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 1403 return "Playback"; 1404 else 1405 return "Capture"; 1406 } 1407 1408 /* 1409 * PCM channel-mapping control API 1410 */ 1411 /* array element of channel maps */ 1412 struct snd_pcm_chmap_elem { 1413 unsigned char channels; 1414 unsigned char map[15]; 1415 }; 1416 1417 /* channel map information; retrieved via snd_kcontrol_chip() */ 1418 struct snd_pcm_chmap { 1419 struct snd_pcm *pcm; /* assigned PCM instance */ 1420 int stream; /* PLAYBACK or CAPTURE */ 1421 struct snd_kcontrol *kctl; 1422 const struct snd_pcm_chmap_elem *chmap; 1423 unsigned int max_channels; 1424 unsigned int channel_mask; /* optional: active channels bitmask */ 1425 void *private_data; /* optional: private data pointer */ 1426 }; 1427 1428 /** 1429 * snd_pcm_chmap_substream - get the PCM substream assigned to the given chmap info 1430 * @info: chmap information 1431 * @idx: the substream number index 1432 */ 1433 static inline struct snd_pcm_substream * 1434 snd_pcm_chmap_substream(struct snd_pcm_chmap *info, unsigned int idx) 1435 { 1436 struct snd_pcm_substream *s; 1437 for (s = info->pcm->streams[info->stream].substream; s; s = s->next) 1438 if (s->number == idx) 1439 return s; 1440 return NULL; 1441 } 1442 1443 /* ALSA-standard channel maps (RL/RR prior to C/LFE) */ 1444 extern const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[]; 1445 /* Other world's standard channel maps (C/LFE prior to RL/RR) */ 1446 extern const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[]; 1447 1448 /* bit masks to be passed to snd_pcm_chmap.channel_mask field */ 1449 #define SND_PCM_CHMAP_MASK_24 ((1U << 2) | (1U << 4)) 1450 #define SND_PCM_CHMAP_MASK_246 (SND_PCM_CHMAP_MASK_24 | (1U << 6)) 1451 #define SND_PCM_CHMAP_MASK_2468 (SND_PCM_CHMAP_MASK_246 | (1U << 8)) 1452 1453 int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream, 1454 const struct snd_pcm_chmap_elem *chmap, 1455 int max_channels, 1456 unsigned long private_value, 1457 struct snd_pcm_chmap **info_ret); 1458 1459 /** 1460 * pcm_format_to_bits - Strong-typed conversion of pcm_format to bitwise 1461 * @pcm_format: PCM format 1462 */ 1463 static inline u64 pcm_format_to_bits(snd_pcm_format_t pcm_format) 1464 { 1465 return 1ULL << (__force int) pcm_format; 1466 } 1467 1468 /** 1469 * pcm_for_each_format - helper to iterate for each format type 1470 * @f: the iterator variable in snd_pcm_format_t type 1471 */ 1472 #define pcm_for_each_format(f) \ 1473 for ((f) = SNDRV_PCM_FORMAT_FIRST; \ 1474 (__force int)(f) <= (__force int)SNDRV_PCM_FORMAT_LAST; \ 1475 (f) = (__force snd_pcm_format_t)((__force int)(f) + 1)) 1476 1477 /* printk helpers */ 1478 #define pcm_err(pcm, fmt, args...) \ 1479 dev_err((pcm)->card->dev, fmt, ##args) 1480 #define pcm_warn(pcm, fmt, args...) \ 1481 dev_warn((pcm)->card->dev, fmt, ##args) 1482 #define pcm_dbg(pcm, fmt, args...) \ 1483 dev_dbg((pcm)->card->dev, fmt, ##args) 1484 1485 struct snd_pcm_status64 { 1486 snd_pcm_state_t state; /* stream state */ 1487 u8 rsvd[4]; 1488 s64 trigger_tstamp_sec; /* time when stream was started/stopped/paused */ 1489 s64 trigger_tstamp_nsec; 1490 s64 tstamp_sec; /* reference timestamp */ 1491 s64 tstamp_nsec; 1492 snd_pcm_uframes_t appl_ptr; /* appl ptr */ 1493 snd_pcm_uframes_t hw_ptr; /* hw ptr */ 1494 snd_pcm_sframes_t delay; /* current delay in frames */ 1495 snd_pcm_uframes_t avail; /* number of frames available */ 1496 snd_pcm_uframes_t avail_max; /* max frames available on hw since last status */ 1497 snd_pcm_uframes_t overrange; /* count of ADC (capture) overrange detections from last status */ 1498 snd_pcm_state_t suspended_state; /* suspended stream state */ 1499 __u32 audio_tstamp_data; /* needed for 64-bit alignment, used for configs/report to/from userspace */ 1500 s64 audio_tstamp_sec; /* sample counter, wall clock, PHC or on-demand sync'ed */ 1501 s64 audio_tstamp_nsec; 1502 s64 driver_tstamp_sec; /* useful in case reference system tstamp is reported with delay */ 1503 s64 driver_tstamp_nsec; 1504 __u32 audio_tstamp_accuracy; /* in ns units, only valid if indicated in audio_tstamp_data */ 1505 unsigned char reserved[52-4*sizeof(s64)]; /* must be filled with zero */ 1506 }; 1507 1508 #define SNDRV_PCM_IOCTL_STATUS64 _IOR('A', 0x20, struct snd_pcm_status64) 1509 #define SNDRV_PCM_IOCTL_STATUS_EXT64 _IOWR('A', 0x24, struct snd_pcm_status64) 1510 1511 struct snd_pcm_status32 { 1512 snd_pcm_state_t state; /* stream state */ 1513 s32 trigger_tstamp_sec; /* time when stream was started/stopped/paused */ 1514 s32 trigger_tstamp_nsec; 1515 s32 tstamp_sec; /* reference timestamp */ 1516 s32 tstamp_nsec; 1517 u32 appl_ptr; /* appl ptr */ 1518 u32 hw_ptr; /* hw ptr */ 1519 s32 delay; /* current delay in frames */ 1520 u32 avail; /* number of frames available */ 1521 u32 avail_max; /* max frames available on hw since last status */ 1522 u32 overrange; /* count of ADC (capture) overrange detections from last status */ 1523 snd_pcm_state_t suspended_state; /* suspended stream state */ 1524 u32 audio_tstamp_data; /* needed for 64-bit alignment, used for configs/report to/from userspace */ 1525 s32 audio_tstamp_sec; /* sample counter, wall clock, PHC or on-demand sync'ed */ 1526 s32 audio_tstamp_nsec; 1527 s32 driver_tstamp_sec; /* useful in case reference system tstamp is reported with delay */ 1528 s32 driver_tstamp_nsec; 1529 u32 audio_tstamp_accuracy; /* in ns units, only valid if indicated in audio_tstamp_data */ 1530 unsigned char reserved[52-4*sizeof(s32)]; /* must be filled with zero */ 1531 }; 1532 1533 #define SNDRV_PCM_IOCTL_STATUS32 _IOR('A', 0x20, struct snd_pcm_status32) 1534 #define SNDRV_PCM_IOCTL_STATUS_EXT32 _IOWR('A', 0x24, struct snd_pcm_status32) 1535 1536 #endif /* __SOUND_PCM_H */ 1537