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 atomic_t buffer_accessing; /* >0: in r/w operation, <0: blocked */ 406 407 /* -- private section -- */ 408 void *private_data; 409 void (*private_free)(struct snd_pcm_runtime *runtime); 410 411 /* -- hardware description -- */ 412 struct snd_pcm_hardware hw; 413 struct snd_pcm_hw_constraints hw_constraints; 414 415 /* -- timer -- */ 416 unsigned int timer_resolution; /* timer resolution */ 417 int tstamp_type; /* timestamp type */ 418 419 /* -- DMA -- */ 420 unsigned char *dma_area; /* DMA area */ 421 dma_addr_t dma_addr; /* physical bus address (not accessible from main CPU) */ 422 size_t dma_bytes; /* size of DMA area */ 423 424 struct snd_dma_buffer *dma_buffer_p; /* allocated buffer */ 425 unsigned int buffer_changed:1; /* buffer allocation changed; set only in managed mode */ 426 427 /* -- audio timestamp config -- */ 428 struct snd_pcm_audio_tstamp_config audio_tstamp_config; 429 struct snd_pcm_audio_tstamp_report audio_tstamp_report; 430 struct timespec64 driver_tstamp; 431 432 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 433 /* -- OSS things -- */ 434 struct snd_pcm_oss_runtime oss; 435 #endif 436 }; 437 438 struct snd_pcm_group { /* keep linked substreams */ 439 spinlock_t lock; 440 struct mutex mutex; 441 struct list_head substreams; 442 refcount_t refs; 443 }; 444 445 struct pid; 446 447 struct snd_pcm_substream { 448 struct snd_pcm *pcm; 449 struct snd_pcm_str *pstr; 450 void *private_data; /* copied from pcm->private_data */ 451 int number; 452 char name[32]; /* substream name */ 453 int stream; /* stream (direction) */ 454 struct pm_qos_request latency_pm_qos_req; /* pm_qos request */ 455 size_t buffer_bytes_max; /* limit ring buffer size */ 456 struct snd_dma_buffer dma_buffer; 457 size_t dma_max; 458 /* -- hardware operations -- */ 459 const struct snd_pcm_ops *ops; 460 /* -- runtime information -- */ 461 struct snd_pcm_runtime *runtime; 462 /* -- timer section -- */ 463 struct snd_timer *timer; /* timer */ 464 unsigned timer_running: 1; /* time is running */ 465 long wait_time; /* time in ms for R/W to wait for avail */ 466 /* -- next substream -- */ 467 struct snd_pcm_substream *next; 468 /* -- linked substreams -- */ 469 struct list_head link_list; /* linked list member */ 470 struct snd_pcm_group self_group; /* fake group for non linked substream (with substream lock inside) */ 471 struct snd_pcm_group *group; /* pointer to current group */ 472 /* -- assigned files -- */ 473 int ref_count; 474 atomic_t mmap_count; 475 unsigned int f_flags; 476 void (*pcm_release)(struct snd_pcm_substream *); 477 struct pid *pid; 478 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 479 /* -- OSS things -- */ 480 struct snd_pcm_oss_substream oss; 481 #endif 482 #ifdef CONFIG_SND_VERBOSE_PROCFS 483 struct snd_info_entry *proc_root; 484 #endif /* CONFIG_SND_VERBOSE_PROCFS */ 485 /* misc flags */ 486 unsigned int hw_opened: 1; 487 unsigned int managed_buffer_alloc:1; 488 }; 489 490 #define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0) 491 492 493 struct snd_pcm_str { 494 int stream; /* stream (direction) */ 495 struct snd_pcm *pcm; 496 /* -- substreams -- */ 497 unsigned int substream_count; 498 unsigned int substream_opened; 499 struct snd_pcm_substream *substream; 500 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 501 /* -- OSS things -- */ 502 struct snd_pcm_oss_stream oss; 503 #endif 504 #ifdef CONFIG_SND_VERBOSE_PROCFS 505 struct snd_info_entry *proc_root; 506 #ifdef CONFIG_SND_PCM_XRUN_DEBUG 507 unsigned int xrun_debug; /* 0 = disabled, 1 = verbose, 2 = stacktrace */ 508 #endif 509 #endif 510 struct snd_kcontrol *chmap_kctl; /* channel-mapping controls */ 511 struct device dev; 512 }; 513 514 struct snd_pcm { 515 struct snd_card *card; 516 struct list_head list; 517 int device; /* device number */ 518 unsigned int info_flags; 519 unsigned short dev_class; 520 unsigned short dev_subclass; 521 char id[64]; 522 char name[80]; 523 struct snd_pcm_str streams[2]; 524 struct mutex open_mutex; 525 wait_queue_head_t open_wait; 526 void *private_data; 527 void (*private_free) (struct snd_pcm *pcm); 528 bool internal; /* pcm is for internal use only */ 529 bool nonatomic; /* whole PCM operations are in non-atomic context */ 530 bool no_device_suspend; /* don't invoke device PM suspend */ 531 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 532 struct snd_pcm_oss oss; 533 #endif 534 }; 535 536 /* 537 * Registering 538 */ 539 540 extern const struct file_operations snd_pcm_f_ops[2]; 541 542 int snd_pcm_new(struct snd_card *card, const char *id, int device, 543 int playback_count, int capture_count, 544 struct snd_pcm **rpcm); 545 int snd_pcm_new_internal(struct snd_card *card, const char *id, int device, 546 int playback_count, int capture_count, 547 struct snd_pcm **rpcm); 548 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count); 549 550 #if IS_ENABLED(CONFIG_SND_PCM_OSS) 551 struct snd_pcm_notify { 552 int (*n_register) (struct snd_pcm * pcm); 553 int (*n_disconnect) (struct snd_pcm * pcm); 554 int (*n_unregister) (struct snd_pcm * pcm); 555 struct list_head list; 556 }; 557 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree); 558 #endif 559 560 /* 561 * Native I/O 562 */ 563 564 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info); 565 int snd_pcm_info_user(struct snd_pcm_substream *substream, 566 struct snd_pcm_info __user *info); 567 int snd_pcm_status64(struct snd_pcm_substream *substream, 568 struct snd_pcm_status64 *status); 569 int snd_pcm_start(struct snd_pcm_substream *substream); 570 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t status); 571 int snd_pcm_drain_done(struct snd_pcm_substream *substream); 572 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream); 573 #ifdef CONFIG_PM 574 int snd_pcm_suspend_all(struct snd_pcm *pcm); 575 #else 576 static inline int snd_pcm_suspend_all(struct snd_pcm *pcm) 577 { 578 return 0; 579 } 580 #endif 581 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg); 582 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file, 583 struct snd_pcm_substream **rsubstream); 584 void snd_pcm_release_substream(struct snd_pcm_substream *substream); 585 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file, 586 struct snd_pcm_substream **rsubstream); 587 void snd_pcm_detach_substream(struct snd_pcm_substream *substream); 588 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area); 589 590 591 #ifdef CONFIG_SND_DEBUG 592 void snd_pcm_debug_name(struct snd_pcm_substream *substream, 593 char *name, size_t len); 594 #else 595 static inline void 596 snd_pcm_debug_name(struct snd_pcm_substream *substream, char *buf, size_t size) 597 { 598 *buf = 0; 599 } 600 #endif 601 602 /* 603 * PCM library 604 */ 605 606 /** 607 * snd_pcm_stream_linked - Check whether the substream is linked with others 608 * @substream: substream to check 609 * 610 * Returns true if the given substream is being linked with others. 611 */ 612 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream) 613 { 614 return substream->group != &substream->self_group; 615 } 616 617 void snd_pcm_stream_lock(struct snd_pcm_substream *substream); 618 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream); 619 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream); 620 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream); 621 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream); 622 unsigned long _snd_pcm_stream_lock_irqsave_nested(struct snd_pcm_substream *substream); 623 624 /** 625 * snd_pcm_stream_lock_irqsave - Lock the PCM stream 626 * @substream: PCM substream 627 * @flags: irq flags 628 * 629 * This locks the PCM stream like snd_pcm_stream_lock() but with the local 630 * IRQ (only when nonatomic is false). In nonatomic case, this is identical 631 * as snd_pcm_stream_lock(). 632 */ 633 #define snd_pcm_stream_lock_irqsave(substream, flags) \ 634 do { \ 635 typecheck(unsigned long, flags); \ 636 flags = _snd_pcm_stream_lock_irqsave(substream); \ 637 } while (0) 638 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream, 639 unsigned long flags); 640 641 /** 642 * snd_pcm_stream_lock_irqsave_nested - Single-nested PCM stream locking 643 * @substream: PCM substream 644 * @flags: irq flags 645 * 646 * This locks the PCM stream like snd_pcm_stream_lock_irqsave() but with 647 * the single-depth lockdep subclass. 648 */ 649 #define snd_pcm_stream_lock_irqsave_nested(substream, flags) \ 650 do { \ 651 typecheck(unsigned long, flags); \ 652 flags = _snd_pcm_stream_lock_irqsave_nested(substream); \ 653 } while (0) 654 655 /** 656 * snd_pcm_group_for_each_entry - iterate over the linked substreams 657 * @s: the iterator 658 * @substream: the substream 659 * 660 * Iterate over the all linked substreams to the given @substream. 661 * When @substream isn't linked with any others, this gives returns @substream 662 * itself once. 663 */ 664 #define snd_pcm_group_for_each_entry(s, substream) \ 665 list_for_each_entry(s, &substream->group->substreams, link_list) 666 667 #define for_each_pcm_streams(stream) \ 668 for (stream = SNDRV_PCM_STREAM_PLAYBACK; \ 669 stream <= SNDRV_PCM_STREAM_LAST; \ 670 stream++) 671 672 /** 673 * snd_pcm_running - Check whether the substream is in a running state 674 * @substream: substream to check 675 * 676 * Returns true if the given substream is in the state RUNNING, or in the 677 * state DRAINING for playback. 678 */ 679 static inline int snd_pcm_running(struct snd_pcm_substream *substream) 680 { 681 return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING || 682 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING && 683 substream->stream == SNDRV_PCM_STREAM_PLAYBACK)); 684 } 685 686 /** 687 * bytes_to_samples - Unit conversion of the size from bytes to samples 688 * @runtime: PCM runtime instance 689 * @size: size in bytes 690 */ 691 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size) 692 { 693 return size * 8 / runtime->sample_bits; 694 } 695 696 /** 697 * bytes_to_frames - Unit conversion of the size from bytes to frames 698 * @runtime: PCM runtime instance 699 * @size: size in bytes 700 */ 701 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size) 702 { 703 return size * 8 / runtime->frame_bits; 704 } 705 706 /** 707 * samples_to_bytes - Unit conversion of the size from samples to bytes 708 * @runtime: PCM runtime instance 709 * @size: size in samples 710 */ 711 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size) 712 { 713 return size * runtime->sample_bits / 8; 714 } 715 716 /** 717 * frames_to_bytes - Unit conversion of the size from frames to bytes 718 * @runtime: PCM runtime instance 719 * @size: size in frames 720 */ 721 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size) 722 { 723 return size * runtime->frame_bits / 8; 724 } 725 726 /** 727 * frame_aligned - Check whether the byte size is aligned to frames 728 * @runtime: PCM runtime instance 729 * @bytes: size in bytes 730 */ 731 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes) 732 { 733 return bytes % runtime->byte_align == 0; 734 } 735 736 /** 737 * snd_pcm_lib_buffer_bytes - Get the buffer size of the current PCM in bytes 738 * @substream: PCM substream 739 */ 740 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream) 741 { 742 struct snd_pcm_runtime *runtime = substream->runtime; 743 return frames_to_bytes(runtime, runtime->buffer_size); 744 } 745 746 /** 747 * snd_pcm_lib_period_bytes - Get the period size of the current PCM in bytes 748 * @substream: PCM substream 749 */ 750 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream) 751 { 752 struct snd_pcm_runtime *runtime = substream->runtime; 753 return frames_to_bytes(runtime, runtime->period_size); 754 } 755 756 /** 757 * snd_pcm_playback_avail - Get the available (writable) space for playback 758 * @runtime: PCM runtime instance 759 * 760 * Result is between 0 ... (boundary - 1) 761 */ 762 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime) 763 { 764 snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr; 765 if (avail < 0) 766 avail += runtime->boundary; 767 else if ((snd_pcm_uframes_t) avail >= runtime->boundary) 768 avail -= runtime->boundary; 769 return avail; 770 } 771 772 /** 773 * snd_pcm_capture_avail - Get the available (readable) space for capture 774 * @runtime: PCM runtime instance 775 * 776 * Result is between 0 ... (boundary - 1) 777 */ 778 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime) 779 { 780 snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr; 781 if (avail < 0) 782 avail += runtime->boundary; 783 return avail; 784 } 785 786 /** 787 * snd_pcm_playback_hw_avail - Get the queued space for playback 788 * @runtime: PCM runtime instance 789 */ 790 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime) 791 { 792 return runtime->buffer_size - snd_pcm_playback_avail(runtime); 793 } 794 795 /** 796 * snd_pcm_capture_hw_avail - Get the free space for capture 797 * @runtime: PCM runtime instance 798 */ 799 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime) 800 { 801 return runtime->buffer_size - snd_pcm_capture_avail(runtime); 802 } 803 804 /** 805 * snd_pcm_playback_ready - check whether the playback buffer is available 806 * @substream: the pcm substream instance 807 * 808 * Checks whether enough free space is available on the playback buffer. 809 * 810 * Return: Non-zero if available, or zero if not. 811 */ 812 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream) 813 { 814 struct snd_pcm_runtime *runtime = substream->runtime; 815 return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min; 816 } 817 818 /** 819 * snd_pcm_capture_ready - check whether the capture buffer is available 820 * @substream: the pcm substream instance 821 * 822 * Checks whether enough capture data is available on the capture buffer. 823 * 824 * Return: Non-zero if available, or zero if not. 825 */ 826 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream) 827 { 828 struct snd_pcm_runtime *runtime = substream->runtime; 829 return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min; 830 } 831 832 /** 833 * snd_pcm_playback_data - check whether any data exists on the playback buffer 834 * @substream: the pcm substream instance 835 * 836 * Checks whether any data exists on the playback buffer. 837 * 838 * Return: Non-zero if any data exists, or zero if not. If stop_threshold 839 * is bigger or equal to boundary, then this function returns always non-zero. 840 */ 841 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream) 842 { 843 struct snd_pcm_runtime *runtime = substream->runtime; 844 845 if (runtime->stop_threshold >= runtime->boundary) 846 return 1; 847 return snd_pcm_playback_avail(runtime) < runtime->buffer_size; 848 } 849 850 /** 851 * snd_pcm_playback_empty - check whether the playback buffer is empty 852 * @substream: the pcm substream instance 853 * 854 * Checks whether the playback buffer is empty. 855 * 856 * Return: Non-zero if empty, or zero if not. 857 */ 858 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream) 859 { 860 struct snd_pcm_runtime *runtime = substream->runtime; 861 return snd_pcm_playback_avail(runtime) >= runtime->buffer_size; 862 } 863 864 /** 865 * snd_pcm_capture_empty - check whether the capture buffer is empty 866 * @substream: the pcm substream instance 867 * 868 * Checks whether the capture buffer is empty. 869 * 870 * Return: Non-zero if empty, or zero if not. 871 */ 872 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream) 873 { 874 struct snd_pcm_runtime *runtime = substream->runtime; 875 return snd_pcm_capture_avail(runtime) == 0; 876 } 877 878 /** 879 * snd_pcm_trigger_done - Mark the master substream 880 * @substream: the pcm substream instance 881 * @master: the linked master substream 882 * 883 * When multiple substreams of the same card are linked and the hardware 884 * supports the single-shot operation, the driver calls this in the loop 885 * in snd_pcm_group_for_each_entry() for marking the substream as "done". 886 * Then most of trigger operations are performed only to the given master 887 * substream. 888 * 889 * The trigger_master mark is cleared at timestamp updates at the end 890 * of trigger operations. 891 */ 892 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream, 893 struct snd_pcm_substream *master) 894 { 895 substream->runtime->trigger_master = master; 896 } 897 898 static inline int hw_is_mask(int var) 899 { 900 return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK && 901 var <= SNDRV_PCM_HW_PARAM_LAST_MASK; 902 } 903 904 static inline int hw_is_interval(int var) 905 { 906 return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL && 907 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; 908 } 909 910 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params, 911 snd_pcm_hw_param_t var) 912 { 913 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK]; 914 } 915 916 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params, 917 snd_pcm_hw_param_t var) 918 { 919 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL]; 920 } 921 922 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params, 923 snd_pcm_hw_param_t var) 924 { 925 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK]; 926 } 927 928 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params, 929 snd_pcm_hw_param_t var) 930 { 931 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL]; 932 } 933 934 /** 935 * params_channels - Get the number of channels from the hw params 936 * @p: hw params 937 */ 938 static inline unsigned int params_channels(const struct snd_pcm_hw_params *p) 939 { 940 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_CHANNELS)->min; 941 } 942 943 /** 944 * params_rate - Get the sample rate from the hw params 945 * @p: hw params 946 */ 947 static inline unsigned int params_rate(const struct snd_pcm_hw_params *p) 948 { 949 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_RATE)->min; 950 } 951 952 /** 953 * params_period_size - Get the period size (in frames) from the hw params 954 * @p: hw params 955 */ 956 static inline unsigned int params_period_size(const struct snd_pcm_hw_params *p) 957 { 958 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min; 959 } 960 961 /** 962 * params_periods - Get the number of periods from the hw params 963 * @p: hw params 964 */ 965 static inline unsigned int params_periods(const struct snd_pcm_hw_params *p) 966 { 967 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIODS)->min; 968 } 969 970 /** 971 * params_buffer_size - Get the buffer size (in frames) from the hw params 972 * @p: hw params 973 */ 974 static inline unsigned int params_buffer_size(const struct snd_pcm_hw_params *p) 975 { 976 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min; 977 } 978 979 /** 980 * params_buffer_bytes - Get the buffer size (in bytes) from the hw params 981 * @p: hw params 982 */ 983 static inline unsigned int params_buffer_bytes(const struct snd_pcm_hw_params *p) 984 { 985 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min; 986 } 987 988 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v); 989 int snd_interval_list(struct snd_interval *i, unsigned int count, 990 const unsigned int *list, unsigned int mask); 991 int snd_interval_ranges(struct snd_interval *i, unsigned int count, 992 const struct snd_interval *list, unsigned int mask); 993 int snd_interval_ratnum(struct snd_interval *i, 994 unsigned int rats_count, const struct snd_ratnum *rats, 995 unsigned int *nump, unsigned int *denp); 996 997 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params); 998 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var); 999 1000 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params); 1001 1002 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, 1003 u_int64_t mask); 1004 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, 1005 unsigned int min, unsigned int max); 1006 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var); 1007 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime, 1008 unsigned int cond, 1009 snd_pcm_hw_param_t var, 1010 const struct snd_pcm_hw_constraint_list *l); 1011 int snd_pcm_hw_constraint_ranges(struct snd_pcm_runtime *runtime, 1012 unsigned int cond, 1013 snd_pcm_hw_param_t var, 1014 const struct snd_pcm_hw_constraint_ranges *r); 1015 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime, 1016 unsigned int cond, 1017 snd_pcm_hw_param_t var, 1018 const struct snd_pcm_hw_constraint_ratnums *r); 1019 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime, 1020 unsigned int cond, 1021 snd_pcm_hw_param_t var, 1022 const struct snd_pcm_hw_constraint_ratdens *r); 1023 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime, 1024 unsigned int cond, 1025 unsigned int width, 1026 unsigned int msbits); 1027 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime, 1028 unsigned int cond, 1029 snd_pcm_hw_param_t var, 1030 unsigned long step); 1031 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime, 1032 unsigned int cond, 1033 snd_pcm_hw_param_t var); 1034 int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime, 1035 unsigned int base_rate); 1036 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, 1037 unsigned int cond, 1038 int var, 1039 snd_pcm_hw_rule_func_t func, void *private, 1040 int dep, ...); 1041 1042 /** 1043 * snd_pcm_hw_constraint_single() - Constrain parameter to a single value 1044 * @runtime: PCM runtime instance 1045 * @var: The hw_params variable to constrain 1046 * @val: The value to constrain to 1047 * 1048 * Return: Positive if the value is changed, zero if it's not changed, or a 1049 * negative error code. 1050 */ 1051 static inline int snd_pcm_hw_constraint_single( 1052 struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, 1053 unsigned int val) 1054 { 1055 return snd_pcm_hw_constraint_minmax(runtime, var, val, val); 1056 } 1057 1058 int snd_pcm_format_signed(snd_pcm_format_t format); 1059 int snd_pcm_format_unsigned(snd_pcm_format_t format); 1060 int snd_pcm_format_linear(snd_pcm_format_t format); 1061 int snd_pcm_format_little_endian(snd_pcm_format_t format); 1062 int snd_pcm_format_big_endian(snd_pcm_format_t format); 1063 #if 0 /* just for kernel-doc */ 1064 /** 1065 * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian 1066 * @format: the format to check 1067 * 1068 * Return: 1 if the given PCM format is CPU-endian, 0 if 1069 * opposite, or a negative error code if endian not specified. 1070 */ 1071 int snd_pcm_format_cpu_endian(snd_pcm_format_t format); 1072 #endif /* DocBook */ 1073 #ifdef SNDRV_LITTLE_ENDIAN 1074 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format) 1075 #else 1076 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format) 1077 #endif 1078 int snd_pcm_format_width(snd_pcm_format_t format); /* in bits */ 1079 int snd_pcm_format_physical_width(snd_pcm_format_t format); /* in bits */ 1080 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples); 1081 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format); 1082 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames); 1083 1084 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction, 1085 const struct snd_pcm_ops *ops); 1086 void snd_pcm_set_sync(struct snd_pcm_substream *substream); 1087 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream, 1088 unsigned int cmd, void *arg); 1089 void snd_pcm_period_elapsed_under_stream_lock(struct snd_pcm_substream *substream); 1090 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream); 1091 snd_pcm_sframes_t __snd_pcm_lib_xfer(struct snd_pcm_substream *substream, 1092 void *buf, bool interleaved, 1093 snd_pcm_uframes_t frames, bool in_kernel); 1094 1095 static inline snd_pcm_sframes_t 1096 snd_pcm_lib_write(struct snd_pcm_substream *substream, 1097 const void __user *buf, snd_pcm_uframes_t frames) 1098 { 1099 return __snd_pcm_lib_xfer(substream, (void __force *)buf, true, frames, false); 1100 } 1101 1102 static inline snd_pcm_sframes_t 1103 snd_pcm_lib_read(struct snd_pcm_substream *substream, 1104 void __user *buf, snd_pcm_uframes_t frames) 1105 { 1106 return __snd_pcm_lib_xfer(substream, (void __force *)buf, true, frames, false); 1107 } 1108 1109 static inline snd_pcm_sframes_t 1110 snd_pcm_lib_writev(struct snd_pcm_substream *substream, 1111 void __user **bufs, snd_pcm_uframes_t frames) 1112 { 1113 return __snd_pcm_lib_xfer(substream, (void *)bufs, false, frames, false); 1114 } 1115 1116 static inline snd_pcm_sframes_t 1117 snd_pcm_lib_readv(struct snd_pcm_substream *substream, 1118 void __user **bufs, snd_pcm_uframes_t frames) 1119 { 1120 return __snd_pcm_lib_xfer(substream, (void *)bufs, false, frames, false); 1121 } 1122 1123 static inline snd_pcm_sframes_t 1124 snd_pcm_kernel_write(struct snd_pcm_substream *substream, 1125 const void *buf, snd_pcm_uframes_t frames) 1126 { 1127 return __snd_pcm_lib_xfer(substream, (void *)buf, true, frames, true); 1128 } 1129 1130 static inline snd_pcm_sframes_t 1131 snd_pcm_kernel_read(struct snd_pcm_substream *substream, 1132 void *buf, snd_pcm_uframes_t frames) 1133 { 1134 return __snd_pcm_lib_xfer(substream, buf, true, frames, true); 1135 } 1136 1137 static inline snd_pcm_sframes_t 1138 snd_pcm_kernel_writev(struct snd_pcm_substream *substream, 1139 void **bufs, snd_pcm_uframes_t frames) 1140 { 1141 return __snd_pcm_lib_xfer(substream, bufs, false, frames, true); 1142 } 1143 1144 static inline snd_pcm_sframes_t 1145 snd_pcm_kernel_readv(struct snd_pcm_substream *substream, 1146 void **bufs, snd_pcm_uframes_t frames) 1147 { 1148 return __snd_pcm_lib_xfer(substream, bufs, false, frames, true); 1149 } 1150 1151 int snd_pcm_hw_limit_rates(struct snd_pcm_hardware *hw); 1152 1153 static inline int 1154 snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime) 1155 { 1156 return snd_pcm_hw_limit_rates(&runtime->hw); 1157 } 1158 1159 unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate); 1160 unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit); 1161 unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a, 1162 unsigned int rates_b); 1163 unsigned int snd_pcm_rate_range_to_bits(unsigned int rate_min, 1164 unsigned int rate_max); 1165 1166 /** 1167 * snd_pcm_set_runtime_buffer - Set the PCM runtime buffer 1168 * @substream: PCM substream to set 1169 * @bufp: the buffer information, NULL to clear 1170 * 1171 * Copy the buffer information to runtime->dma_buffer when @bufp is non-NULL. 1172 * Otherwise it clears the current buffer information. 1173 */ 1174 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream, 1175 struct snd_dma_buffer *bufp) 1176 { 1177 struct snd_pcm_runtime *runtime = substream->runtime; 1178 if (bufp) { 1179 runtime->dma_buffer_p = bufp; 1180 runtime->dma_area = bufp->area; 1181 runtime->dma_addr = bufp->addr; 1182 runtime->dma_bytes = bufp->bytes; 1183 } else { 1184 runtime->dma_buffer_p = NULL; 1185 runtime->dma_area = NULL; 1186 runtime->dma_addr = 0; 1187 runtime->dma_bytes = 0; 1188 } 1189 } 1190 1191 /** 1192 * snd_pcm_gettime - Fill the timespec64 depending on the timestamp mode 1193 * @runtime: PCM runtime instance 1194 * @tv: timespec64 to fill 1195 */ 1196 static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime, 1197 struct timespec64 *tv) 1198 { 1199 switch (runtime->tstamp_type) { 1200 case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC: 1201 ktime_get_ts64(tv); 1202 break; 1203 case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC_RAW: 1204 ktime_get_raw_ts64(tv); 1205 break; 1206 default: 1207 ktime_get_real_ts64(tv); 1208 break; 1209 } 1210 } 1211 1212 /* 1213 * Memory 1214 */ 1215 1216 void snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream); 1217 void snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm); 1218 void snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream, 1219 int type, struct device *data, 1220 size_t size, size_t max); 1221 void snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm, 1222 int type, void *data, 1223 size_t size, size_t max); 1224 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size); 1225 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream); 1226 1227 int snd_pcm_set_managed_buffer(struct snd_pcm_substream *substream, int type, 1228 struct device *data, size_t size, size_t max); 1229 int snd_pcm_set_managed_buffer_all(struct snd_pcm *pcm, int type, 1230 struct device *data, 1231 size_t size, size_t max); 1232 1233 /** 1234 * snd_pcm_set_fixed_buffer - Preallocate and set up the fixed size PCM buffer 1235 * @substream: the pcm substream instance 1236 * @type: DMA type (SNDRV_DMA_TYPE_*) 1237 * @data: DMA type dependent data 1238 * @size: the requested pre-allocation size in bytes 1239 * 1240 * This is a variant of snd_pcm_set_managed_buffer(), but this pre-allocates 1241 * only the given sized buffer and doesn't allow re-allocation nor dynamic 1242 * allocation of a larger buffer unlike the standard one. 1243 * The function may return -ENOMEM error, hence the caller must check it. 1244 */ 1245 static inline int __must_check 1246 snd_pcm_set_fixed_buffer(struct snd_pcm_substream *substream, int type, 1247 struct device *data, size_t size) 1248 { 1249 return snd_pcm_set_managed_buffer(substream, type, data, size, 0); 1250 } 1251 1252 /** 1253 * snd_pcm_set_fixed_buffer_all - Preallocate and set up the fixed size PCM buffer 1254 * @pcm: the pcm instance 1255 * @type: DMA type (SNDRV_DMA_TYPE_*) 1256 * @data: DMA type dependent data 1257 * @size: the requested pre-allocation size in bytes 1258 * 1259 * Apply the set up of the fixed buffer via snd_pcm_set_fixed_buffer() for 1260 * all substream. If any of allocation fails, it returns -ENOMEM, hence the 1261 * caller must check the return value. 1262 */ 1263 static inline int __must_check 1264 snd_pcm_set_fixed_buffer_all(struct snd_pcm *pcm, int type, 1265 struct device *data, size_t size) 1266 { 1267 return snd_pcm_set_managed_buffer_all(pcm, type, data, size, 0); 1268 } 1269 1270 int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream, 1271 size_t size, gfp_t gfp_flags); 1272 int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream); 1273 struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream, 1274 unsigned long offset); 1275 /** 1276 * snd_pcm_lib_alloc_vmalloc_buffer - allocate virtual DMA buffer 1277 * @substream: the substream to allocate the buffer to 1278 * @size: the requested buffer size, in bytes 1279 * 1280 * Allocates the PCM substream buffer using vmalloc(), i.e., the memory is 1281 * contiguous in kernel virtual space, but not in physical memory. Use this 1282 * if the buffer is accessed by kernel code but not by device DMA. 1283 * 1284 * Return: 1 if the buffer was changed, 0 if not changed, or a negative error 1285 * code. 1286 */ 1287 static inline int snd_pcm_lib_alloc_vmalloc_buffer 1288 (struct snd_pcm_substream *substream, size_t size) 1289 { 1290 return _snd_pcm_lib_alloc_vmalloc_buffer(substream, size, 1291 GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO); 1292 } 1293 1294 /** 1295 * snd_pcm_lib_alloc_vmalloc_32_buffer - allocate 32-bit-addressable buffer 1296 * @substream: the substream to allocate the buffer to 1297 * @size: the requested buffer size, in bytes 1298 * 1299 * This function works like snd_pcm_lib_alloc_vmalloc_buffer(), but uses 1300 * vmalloc_32(), i.e., the pages are allocated from 32-bit-addressable memory. 1301 * 1302 * Return: 1 if the buffer was changed, 0 if not changed, or a negative error 1303 * code. 1304 */ 1305 static inline int snd_pcm_lib_alloc_vmalloc_32_buffer 1306 (struct snd_pcm_substream *substream, size_t size) 1307 { 1308 return _snd_pcm_lib_alloc_vmalloc_buffer(substream, size, 1309 GFP_KERNEL | GFP_DMA32 | __GFP_ZERO); 1310 } 1311 1312 #define snd_pcm_get_dma_buf(substream) ((substream)->runtime->dma_buffer_p) 1313 1314 /** 1315 * snd_pcm_sgbuf_get_addr - Get the DMA address at the corresponding offset 1316 * @substream: PCM substream 1317 * @ofs: byte offset 1318 */ 1319 static inline dma_addr_t 1320 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs) 1321 { 1322 return snd_sgbuf_get_addr(snd_pcm_get_dma_buf(substream), ofs); 1323 } 1324 1325 /** 1326 * snd_pcm_sgbuf_get_chunk_size - Compute the max size that fits within the 1327 * contig. page from the given size 1328 * @substream: PCM substream 1329 * @ofs: byte offset 1330 * @size: byte size to examine 1331 */ 1332 static inline unsigned int 1333 snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream, 1334 unsigned int ofs, unsigned int size) 1335 { 1336 return snd_sgbuf_get_chunk_size(snd_pcm_get_dma_buf(substream), ofs, size); 1337 } 1338 1339 /** 1340 * snd_pcm_mmap_data_open - increase the mmap counter 1341 * @area: VMA 1342 * 1343 * PCM mmap callback should handle this counter properly 1344 */ 1345 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area) 1346 { 1347 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data; 1348 atomic_inc(&substream->mmap_count); 1349 } 1350 1351 /** 1352 * snd_pcm_mmap_data_close - decrease the mmap counter 1353 * @area: VMA 1354 * 1355 * PCM mmap callback should handle this counter properly 1356 */ 1357 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area) 1358 { 1359 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data; 1360 atomic_dec(&substream->mmap_count); 1361 } 1362 1363 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 1364 struct vm_area_struct *area); 1365 /* mmap for io-memory area */ 1366 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 1367 #define SNDRV_PCM_INFO_MMAP_IOMEM SNDRV_PCM_INFO_MMAP 1368 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area); 1369 #else 1370 #define SNDRV_PCM_INFO_MMAP_IOMEM 0 1371 #define snd_pcm_lib_mmap_iomem NULL 1372 #endif 1373 1374 /** 1375 * snd_pcm_limit_isa_dma_size - Get the max size fitting with ISA DMA transfer 1376 * @dma: DMA number 1377 * @max: pointer to store the max size 1378 */ 1379 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max) 1380 { 1381 *max = dma < 4 ? 64 * 1024 : 128 * 1024; 1382 } 1383 1384 /* 1385 * Misc 1386 */ 1387 1388 #define SNDRV_PCM_DEFAULT_CON_SPDIF (IEC958_AES0_CON_EMPHASIS_NONE|\ 1389 (IEC958_AES1_CON_ORIGINAL<<8)|\ 1390 (IEC958_AES1_CON_PCM_CODER<<8)|\ 1391 (IEC958_AES3_CON_FS_48000<<24)) 1392 1393 const char *snd_pcm_format_name(snd_pcm_format_t format); 1394 1395 /** 1396 * snd_pcm_stream_str - Get a string naming the direction of a stream 1397 * @substream: the pcm substream instance 1398 * 1399 * Return: A string naming the direction of the stream. 1400 */ 1401 static inline const char *snd_pcm_stream_str(struct snd_pcm_substream *substream) 1402 { 1403 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 1404 return "Playback"; 1405 else 1406 return "Capture"; 1407 } 1408 1409 /* 1410 * PCM channel-mapping control API 1411 */ 1412 /* array element of channel maps */ 1413 struct snd_pcm_chmap_elem { 1414 unsigned char channels; 1415 unsigned char map[15]; 1416 }; 1417 1418 /* channel map information; retrieved via snd_kcontrol_chip() */ 1419 struct snd_pcm_chmap { 1420 struct snd_pcm *pcm; /* assigned PCM instance */ 1421 int stream; /* PLAYBACK or CAPTURE */ 1422 struct snd_kcontrol *kctl; 1423 const struct snd_pcm_chmap_elem *chmap; 1424 unsigned int max_channels; 1425 unsigned int channel_mask; /* optional: active channels bitmask */ 1426 void *private_data; /* optional: private data pointer */ 1427 }; 1428 1429 /** 1430 * snd_pcm_chmap_substream - get the PCM substream assigned to the given chmap info 1431 * @info: chmap information 1432 * @idx: the substream number index 1433 */ 1434 static inline struct snd_pcm_substream * 1435 snd_pcm_chmap_substream(struct snd_pcm_chmap *info, unsigned int idx) 1436 { 1437 struct snd_pcm_substream *s; 1438 for (s = info->pcm->streams[info->stream].substream; s; s = s->next) 1439 if (s->number == idx) 1440 return s; 1441 return NULL; 1442 } 1443 1444 /* ALSA-standard channel maps (RL/RR prior to C/LFE) */ 1445 extern const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[]; 1446 /* Other world's standard channel maps (C/LFE prior to RL/RR) */ 1447 extern const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[]; 1448 1449 /* bit masks to be passed to snd_pcm_chmap.channel_mask field */ 1450 #define SND_PCM_CHMAP_MASK_24 ((1U << 2) | (1U << 4)) 1451 #define SND_PCM_CHMAP_MASK_246 (SND_PCM_CHMAP_MASK_24 | (1U << 6)) 1452 #define SND_PCM_CHMAP_MASK_2468 (SND_PCM_CHMAP_MASK_246 | (1U << 8)) 1453 1454 int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream, 1455 const struct snd_pcm_chmap_elem *chmap, 1456 int max_channels, 1457 unsigned long private_value, 1458 struct snd_pcm_chmap **info_ret); 1459 1460 /** 1461 * pcm_format_to_bits - Strong-typed conversion of pcm_format to bitwise 1462 * @pcm_format: PCM format 1463 */ 1464 static inline u64 pcm_format_to_bits(snd_pcm_format_t pcm_format) 1465 { 1466 return 1ULL << (__force int) pcm_format; 1467 } 1468 1469 /** 1470 * pcm_for_each_format - helper to iterate for each format type 1471 * @f: the iterator variable in snd_pcm_format_t type 1472 */ 1473 #define pcm_for_each_format(f) \ 1474 for ((f) = SNDRV_PCM_FORMAT_FIRST; \ 1475 (__force int)(f) <= (__force int)SNDRV_PCM_FORMAT_LAST; \ 1476 (f) = (__force snd_pcm_format_t)((__force int)(f) + 1)) 1477 1478 /* printk helpers */ 1479 #define pcm_err(pcm, fmt, args...) \ 1480 dev_err((pcm)->card->dev, fmt, ##args) 1481 #define pcm_warn(pcm, fmt, args...) \ 1482 dev_warn((pcm)->card->dev, fmt, ##args) 1483 #define pcm_dbg(pcm, fmt, args...) \ 1484 dev_dbg((pcm)->card->dev, fmt, ##args) 1485 1486 struct snd_pcm_status64 { 1487 snd_pcm_state_t state; /* stream state */ 1488 u8 rsvd[4]; 1489 s64 trigger_tstamp_sec; /* time when stream was started/stopped/paused */ 1490 s64 trigger_tstamp_nsec; 1491 s64 tstamp_sec; /* reference timestamp */ 1492 s64 tstamp_nsec; 1493 snd_pcm_uframes_t appl_ptr; /* appl ptr */ 1494 snd_pcm_uframes_t hw_ptr; /* hw ptr */ 1495 snd_pcm_sframes_t delay; /* current delay in frames */ 1496 snd_pcm_uframes_t avail; /* number of frames available */ 1497 snd_pcm_uframes_t avail_max; /* max frames available on hw since last status */ 1498 snd_pcm_uframes_t overrange; /* count of ADC (capture) overrange detections from last status */ 1499 snd_pcm_state_t suspended_state; /* suspended stream state */ 1500 __u32 audio_tstamp_data; /* needed for 64-bit alignment, used for configs/report to/from userspace */ 1501 s64 audio_tstamp_sec; /* sample counter, wall clock, PHC or on-demand sync'ed */ 1502 s64 audio_tstamp_nsec; 1503 s64 driver_tstamp_sec; /* useful in case reference system tstamp is reported with delay */ 1504 s64 driver_tstamp_nsec; 1505 __u32 audio_tstamp_accuracy; /* in ns units, only valid if indicated in audio_tstamp_data */ 1506 unsigned char reserved[52-4*sizeof(s64)]; /* must be filled with zero */ 1507 }; 1508 1509 #define SNDRV_PCM_IOCTL_STATUS64 _IOR('A', 0x20, struct snd_pcm_status64) 1510 #define SNDRV_PCM_IOCTL_STATUS_EXT64 _IOWR('A', 0x24, struct snd_pcm_status64) 1511 1512 struct snd_pcm_status32 { 1513 snd_pcm_state_t state; /* stream state */ 1514 s32 trigger_tstamp_sec; /* time when stream was started/stopped/paused */ 1515 s32 trigger_tstamp_nsec; 1516 s32 tstamp_sec; /* reference timestamp */ 1517 s32 tstamp_nsec; 1518 u32 appl_ptr; /* appl ptr */ 1519 u32 hw_ptr; /* hw ptr */ 1520 s32 delay; /* current delay in frames */ 1521 u32 avail; /* number of frames available */ 1522 u32 avail_max; /* max frames available on hw since last status */ 1523 u32 overrange; /* count of ADC (capture) overrange detections from last status */ 1524 snd_pcm_state_t suspended_state; /* suspended stream state */ 1525 u32 audio_tstamp_data; /* needed for 64-bit alignment, used for configs/report to/from userspace */ 1526 s32 audio_tstamp_sec; /* sample counter, wall clock, PHC or on-demand sync'ed */ 1527 s32 audio_tstamp_nsec; 1528 s32 driver_tstamp_sec; /* useful in case reference system tstamp is reported with delay */ 1529 s32 driver_tstamp_nsec; 1530 u32 audio_tstamp_accuracy; /* in ns units, only valid if indicated in audio_tstamp_data */ 1531 unsigned char reserved[52-4*sizeof(s32)]; /* must be filled with zero */ 1532 }; 1533 1534 #define SNDRV_PCM_IOCTL_STATUS32 _IOR('A', 0x20, struct snd_pcm_status32) 1535 #define SNDRV_PCM_IOCTL_STATUS_EXT32 _IOWR('A', 0x24, struct snd_pcm_status32) 1536 1537 #endif /* __SOUND_PCM_H */ 1538