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 snd_fasync *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 * Return: 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 * Return: 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 * Return: the size in samples 692 */ 693 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size) 694 { 695 return size * 8 / runtime->sample_bits; 696 } 697 698 /** 699 * bytes_to_frames - Unit conversion of the size from bytes to frames 700 * @runtime: PCM runtime instance 701 * @size: size in bytes 702 * 703 * Return: the size in frames 704 */ 705 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size) 706 { 707 return size * 8 / runtime->frame_bits; 708 } 709 710 /** 711 * samples_to_bytes - Unit conversion of the size from samples to bytes 712 * @runtime: PCM runtime instance 713 * @size: size in samples 714 * 715 * Return: the byte size 716 */ 717 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size) 718 { 719 return size * runtime->sample_bits / 8; 720 } 721 722 /** 723 * frames_to_bytes - Unit conversion of the size from frames to bytes 724 * @runtime: PCM runtime instance 725 * @size: size in frames 726 * 727 * Return: the byte size 728 */ 729 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size) 730 { 731 return size * runtime->frame_bits / 8; 732 } 733 734 /** 735 * frame_aligned - Check whether the byte size is aligned to frames 736 * @runtime: PCM runtime instance 737 * @bytes: size in bytes 738 * 739 * Return: true if aligned, or false if not 740 */ 741 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes) 742 { 743 return bytes % runtime->byte_align == 0; 744 } 745 746 /** 747 * snd_pcm_lib_buffer_bytes - Get the buffer size of the current PCM in bytes 748 * @substream: PCM substream 749 * 750 * Return: buffer byte size 751 */ 752 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream) 753 { 754 struct snd_pcm_runtime *runtime = substream->runtime; 755 return frames_to_bytes(runtime, runtime->buffer_size); 756 } 757 758 /** 759 * snd_pcm_lib_period_bytes - Get the period size of the current PCM in bytes 760 * @substream: PCM substream 761 * 762 * Return: period byte size 763 */ 764 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream) 765 { 766 struct snd_pcm_runtime *runtime = substream->runtime; 767 return frames_to_bytes(runtime, runtime->period_size); 768 } 769 770 /** 771 * snd_pcm_playback_avail - Get the available (writable) space for playback 772 * @runtime: PCM runtime instance 773 * 774 * Result is between 0 ... (boundary - 1) 775 * 776 * Return: available frame size 777 */ 778 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime) 779 { 780 snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr; 781 if (avail < 0) 782 avail += runtime->boundary; 783 else if ((snd_pcm_uframes_t) avail >= runtime->boundary) 784 avail -= runtime->boundary; 785 return avail; 786 } 787 788 /** 789 * snd_pcm_capture_avail - Get the available (readable) space for capture 790 * @runtime: PCM runtime instance 791 * 792 * Result is between 0 ... (boundary - 1) 793 * 794 * Return: available frame size 795 */ 796 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime) 797 { 798 snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr; 799 if (avail < 0) 800 avail += runtime->boundary; 801 return avail; 802 } 803 804 /** 805 * snd_pcm_playback_hw_avail - Get the queued space for playback 806 * @runtime: PCM runtime instance 807 * 808 * Return: available frame size 809 */ 810 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime) 811 { 812 return runtime->buffer_size - snd_pcm_playback_avail(runtime); 813 } 814 815 /** 816 * snd_pcm_capture_hw_avail - Get the free space for capture 817 * @runtime: PCM runtime instance 818 * 819 * Return: available frame size 820 */ 821 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime) 822 { 823 return runtime->buffer_size - snd_pcm_capture_avail(runtime); 824 } 825 826 /** 827 * snd_pcm_playback_ready - check whether the playback buffer is available 828 * @substream: the pcm substream instance 829 * 830 * Checks whether enough free space is available on the playback buffer. 831 * 832 * Return: Non-zero if available, or zero if not. 833 */ 834 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream) 835 { 836 struct snd_pcm_runtime *runtime = substream->runtime; 837 return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min; 838 } 839 840 /** 841 * snd_pcm_capture_ready - check whether the capture buffer is available 842 * @substream: the pcm substream instance 843 * 844 * Checks whether enough capture data is available on the capture buffer. 845 * 846 * Return: Non-zero if available, or zero if not. 847 */ 848 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream) 849 { 850 struct snd_pcm_runtime *runtime = substream->runtime; 851 return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min; 852 } 853 854 /** 855 * snd_pcm_playback_data - check whether any data exists on the playback buffer 856 * @substream: the pcm substream instance 857 * 858 * Checks whether any data exists on the playback buffer. 859 * 860 * Return: Non-zero if any data exists, or zero if not. If stop_threshold 861 * is bigger or equal to boundary, then this function returns always non-zero. 862 */ 863 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream) 864 { 865 struct snd_pcm_runtime *runtime = substream->runtime; 866 867 if (runtime->stop_threshold >= runtime->boundary) 868 return 1; 869 return snd_pcm_playback_avail(runtime) < runtime->buffer_size; 870 } 871 872 /** 873 * snd_pcm_playback_empty - check whether the playback buffer is empty 874 * @substream: the pcm substream instance 875 * 876 * Checks whether the playback buffer is empty. 877 * 878 * Return: Non-zero if empty, or zero if not. 879 */ 880 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream) 881 { 882 struct snd_pcm_runtime *runtime = substream->runtime; 883 return snd_pcm_playback_avail(runtime) >= runtime->buffer_size; 884 } 885 886 /** 887 * snd_pcm_capture_empty - check whether the capture buffer is empty 888 * @substream: the pcm substream instance 889 * 890 * Checks whether the capture buffer is empty. 891 * 892 * Return: Non-zero if empty, or zero if not. 893 */ 894 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream) 895 { 896 struct snd_pcm_runtime *runtime = substream->runtime; 897 return snd_pcm_capture_avail(runtime) == 0; 898 } 899 900 /** 901 * snd_pcm_trigger_done - Mark the master substream 902 * @substream: the pcm substream instance 903 * @master: the linked master substream 904 * 905 * When multiple substreams of the same card are linked and the hardware 906 * supports the single-shot operation, the driver calls this in the loop 907 * in snd_pcm_group_for_each_entry() for marking the substream as "done". 908 * Then most of trigger operations are performed only to the given master 909 * substream. 910 * 911 * The trigger_master mark is cleared at timestamp updates at the end 912 * of trigger operations. 913 */ 914 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream, 915 struct snd_pcm_substream *master) 916 { 917 substream->runtime->trigger_master = master; 918 } 919 920 static inline int hw_is_mask(int var) 921 { 922 return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK && 923 var <= SNDRV_PCM_HW_PARAM_LAST_MASK; 924 } 925 926 static inline int hw_is_interval(int var) 927 { 928 return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL && 929 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; 930 } 931 932 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params, 933 snd_pcm_hw_param_t var) 934 { 935 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK]; 936 } 937 938 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params, 939 snd_pcm_hw_param_t var) 940 { 941 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL]; 942 } 943 944 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params, 945 snd_pcm_hw_param_t var) 946 { 947 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK]; 948 } 949 950 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params, 951 snd_pcm_hw_param_t var) 952 { 953 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL]; 954 } 955 956 /** 957 * params_channels - Get the number of channels from the hw params 958 * @p: hw params 959 * 960 * Return: the number of channels 961 */ 962 static inline unsigned int params_channels(const struct snd_pcm_hw_params *p) 963 { 964 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_CHANNELS)->min; 965 } 966 967 /** 968 * params_rate - Get the sample rate from the hw params 969 * @p: hw params 970 * 971 * Return: the sample rate 972 */ 973 static inline unsigned int params_rate(const struct snd_pcm_hw_params *p) 974 { 975 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_RATE)->min; 976 } 977 978 /** 979 * params_period_size - Get the period size (in frames) from the hw params 980 * @p: hw params 981 * 982 * Return: the period size in frames 983 */ 984 static inline unsigned int params_period_size(const struct snd_pcm_hw_params *p) 985 { 986 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min; 987 } 988 989 /** 990 * params_periods - Get the number of periods from the hw params 991 * @p: hw params 992 * 993 * Return: the number of periods 994 */ 995 static inline unsigned int params_periods(const struct snd_pcm_hw_params *p) 996 { 997 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIODS)->min; 998 } 999 1000 /** 1001 * params_buffer_size - Get the buffer size (in frames) from the hw params 1002 * @p: hw params 1003 * 1004 * Return: the buffer size in frames 1005 */ 1006 static inline unsigned int params_buffer_size(const struct snd_pcm_hw_params *p) 1007 { 1008 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min; 1009 } 1010 1011 /** 1012 * params_buffer_bytes - Get the buffer size (in bytes) from the hw params 1013 * @p: hw params 1014 * 1015 * Return: the buffer size in bytes 1016 */ 1017 static inline unsigned int params_buffer_bytes(const struct snd_pcm_hw_params *p) 1018 { 1019 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min; 1020 } 1021 1022 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v); 1023 int snd_interval_list(struct snd_interval *i, unsigned int count, 1024 const unsigned int *list, unsigned int mask); 1025 int snd_interval_ranges(struct snd_interval *i, unsigned int count, 1026 const struct snd_interval *list, unsigned int mask); 1027 int snd_interval_ratnum(struct snd_interval *i, 1028 unsigned int rats_count, const struct snd_ratnum *rats, 1029 unsigned int *nump, unsigned int *denp); 1030 1031 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params); 1032 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var); 1033 1034 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params); 1035 1036 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, 1037 u_int64_t mask); 1038 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, 1039 unsigned int min, unsigned int max); 1040 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var); 1041 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime, 1042 unsigned int cond, 1043 snd_pcm_hw_param_t var, 1044 const struct snd_pcm_hw_constraint_list *l); 1045 int snd_pcm_hw_constraint_ranges(struct snd_pcm_runtime *runtime, 1046 unsigned int cond, 1047 snd_pcm_hw_param_t var, 1048 const struct snd_pcm_hw_constraint_ranges *r); 1049 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime, 1050 unsigned int cond, 1051 snd_pcm_hw_param_t var, 1052 const struct snd_pcm_hw_constraint_ratnums *r); 1053 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime, 1054 unsigned int cond, 1055 snd_pcm_hw_param_t var, 1056 const struct snd_pcm_hw_constraint_ratdens *r); 1057 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime, 1058 unsigned int cond, 1059 unsigned int width, 1060 unsigned int msbits); 1061 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime, 1062 unsigned int cond, 1063 snd_pcm_hw_param_t var, 1064 unsigned long step); 1065 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime, 1066 unsigned int cond, 1067 snd_pcm_hw_param_t var); 1068 int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime, 1069 unsigned int base_rate); 1070 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, 1071 unsigned int cond, 1072 int var, 1073 snd_pcm_hw_rule_func_t func, void *private, 1074 int dep, ...); 1075 1076 /** 1077 * snd_pcm_hw_constraint_single() - Constrain parameter to a single value 1078 * @runtime: PCM runtime instance 1079 * @var: The hw_params variable to constrain 1080 * @val: The value to constrain to 1081 * 1082 * Return: Positive if the value is changed, zero if it's not changed, or a 1083 * negative error code. 1084 */ 1085 static inline int snd_pcm_hw_constraint_single( 1086 struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, 1087 unsigned int val) 1088 { 1089 return snd_pcm_hw_constraint_minmax(runtime, var, val, val); 1090 } 1091 1092 int snd_pcm_format_signed(snd_pcm_format_t format); 1093 int snd_pcm_format_unsigned(snd_pcm_format_t format); 1094 int snd_pcm_format_linear(snd_pcm_format_t format); 1095 int snd_pcm_format_little_endian(snd_pcm_format_t format); 1096 int snd_pcm_format_big_endian(snd_pcm_format_t format); 1097 #if 0 /* just for kernel-doc */ 1098 /** 1099 * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian 1100 * @format: the format to check 1101 * 1102 * Return: 1 if the given PCM format is CPU-endian, 0 if 1103 * opposite, or a negative error code if endian not specified. 1104 */ 1105 int snd_pcm_format_cpu_endian(snd_pcm_format_t format); 1106 #endif /* DocBook */ 1107 #ifdef SNDRV_LITTLE_ENDIAN 1108 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format) 1109 #else 1110 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format) 1111 #endif 1112 int snd_pcm_format_width(snd_pcm_format_t format); /* in bits */ 1113 int snd_pcm_format_physical_width(snd_pcm_format_t format); /* in bits */ 1114 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples); 1115 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format); 1116 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames); 1117 1118 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction, 1119 const struct snd_pcm_ops *ops); 1120 void snd_pcm_set_sync(struct snd_pcm_substream *substream); 1121 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream, 1122 unsigned int cmd, void *arg); 1123 void snd_pcm_period_elapsed_under_stream_lock(struct snd_pcm_substream *substream); 1124 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream); 1125 snd_pcm_sframes_t __snd_pcm_lib_xfer(struct snd_pcm_substream *substream, 1126 void *buf, bool interleaved, 1127 snd_pcm_uframes_t frames, bool in_kernel); 1128 1129 static inline snd_pcm_sframes_t 1130 snd_pcm_lib_write(struct snd_pcm_substream *substream, 1131 const void __user *buf, snd_pcm_uframes_t frames) 1132 { 1133 return __snd_pcm_lib_xfer(substream, (void __force *)buf, true, frames, false); 1134 } 1135 1136 static inline snd_pcm_sframes_t 1137 snd_pcm_lib_read(struct snd_pcm_substream *substream, 1138 void __user *buf, snd_pcm_uframes_t frames) 1139 { 1140 return __snd_pcm_lib_xfer(substream, (void __force *)buf, true, frames, false); 1141 } 1142 1143 static inline snd_pcm_sframes_t 1144 snd_pcm_lib_writev(struct snd_pcm_substream *substream, 1145 void __user **bufs, snd_pcm_uframes_t frames) 1146 { 1147 return __snd_pcm_lib_xfer(substream, (void *)bufs, false, frames, false); 1148 } 1149 1150 static inline snd_pcm_sframes_t 1151 snd_pcm_lib_readv(struct snd_pcm_substream *substream, 1152 void __user **bufs, snd_pcm_uframes_t frames) 1153 { 1154 return __snd_pcm_lib_xfer(substream, (void *)bufs, false, frames, false); 1155 } 1156 1157 static inline snd_pcm_sframes_t 1158 snd_pcm_kernel_write(struct snd_pcm_substream *substream, 1159 const void *buf, snd_pcm_uframes_t frames) 1160 { 1161 return __snd_pcm_lib_xfer(substream, (void *)buf, true, frames, true); 1162 } 1163 1164 static inline snd_pcm_sframes_t 1165 snd_pcm_kernel_read(struct snd_pcm_substream *substream, 1166 void *buf, snd_pcm_uframes_t frames) 1167 { 1168 return __snd_pcm_lib_xfer(substream, buf, true, frames, true); 1169 } 1170 1171 static inline snd_pcm_sframes_t 1172 snd_pcm_kernel_writev(struct snd_pcm_substream *substream, 1173 void **bufs, snd_pcm_uframes_t frames) 1174 { 1175 return __snd_pcm_lib_xfer(substream, bufs, false, frames, true); 1176 } 1177 1178 static inline snd_pcm_sframes_t 1179 snd_pcm_kernel_readv(struct snd_pcm_substream *substream, 1180 void **bufs, snd_pcm_uframes_t frames) 1181 { 1182 return __snd_pcm_lib_xfer(substream, bufs, false, frames, true); 1183 } 1184 1185 int snd_pcm_hw_limit_rates(struct snd_pcm_hardware *hw); 1186 1187 static inline int 1188 snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime) 1189 { 1190 return snd_pcm_hw_limit_rates(&runtime->hw); 1191 } 1192 1193 unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate); 1194 unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit); 1195 unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a, 1196 unsigned int rates_b); 1197 unsigned int snd_pcm_rate_range_to_bits(unsigned int rate_min, 1198 unsigned int rate_max); 1199 1200 /** 1201 * snd_pcm_set_runtime_buffer - Set the PCM runtime buffer 1202 * @substream: PCM substream to set 1203 * @bufp: the buffer information, NULL to clear 1204 * 1205 * Copy the buffer information to runtime->dma_buffer when @bufp is non-NULL. 1206 * Otherwise it clears the current buffer information. 1207 */ 1208 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream, 1209 struct snd_dma_buffer *bufp) 1210 { 1211 struct snd_pcm_runtime *runtime = substream->runtime; 1212 if (bufp) { 1213 runtime->dma_buffer_p = bufp; 1214 runtime->dma_area = bufp->area; 1215 runtime->dma_addr = bufp->addr; 1216 runtime->dma_bytes = bufp->bytes; 1217 } else { 1218 runtime->dma_buffer_p = NULL; 1219 runtime->dma_area = NULL; 1220 runtime->dma_addr = 0; 1221 runtime->dma_bytes = 0; 1222 } 1223 } 1224 1225 /** 1226 * snd_pcm_gettime - Fill the timespec64 depending on the timestamp mode 1227 * @runtime: PCM runtime instance 1228 * @tv: timespec64 to fill 1229 */ 1230 static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime, 1231 struct timespec64 *tv) 1232 { 1233 switch (runtime->tstamp_type) { 1234 case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC: 1235 ktime_get_ts64(tv); 1236 break; 1237 case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC_RAW: 1238 ktime_get_raw_ts64(tv); 1239 break; 1240 default: 1241 ktime_get_real_ts64(tv); 1242 break; 1243 } 1244 } 1245 1246 /* 1247 * Memory 1248 */ 1249 1250 void snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream); 1251 void snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm); 1252 void snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream, 1253 int type, struct device *data, 1254 size_t size, size_t max); 1255 void snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm, 1256 int type, void *data, 1257 size_t size, size_t max); 1258 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size); 1259 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream); 1260 1261 int snd_pcm_set_managed_buffer(struct snd_pcm_substream *substream, int type, 1262 struct device *data, size_t size, size_t max); 1263 int snd_pcm_set_managed_buffer_all(struct snd_pcm *pcm, int type, 1264 struct device *data, 1265 size_t size, size_t max); 1266 1267 /** 1268 * snd_pcm_set_fixed_buffer - Preallocate and set up the fixed size PCM buffer 1269 * @substream: the pcm substream instance 1270 * @type: DMA type (SNDRV_DMA_TYPE_*) 1271 * @data: DMA type dependent data 1272 * @size: the requested pre-allocation size in bytes 1273 * 1274 * This is a variant of snd_pcm_set_managed_buffer(), but this pre-allocates 1275 * only the given sized buffer and doesn't allow re-allocation nor dynamic 1276 * allocation of a larger buffer unlike the standard one. 1277 * The function may return -ENOMEM error, hence the caller must check it. 1278 * 1279 * Return: zero if successful, or a negative error code 1280 */ 1281 static inline int __must_check 1282 snd_pcm_set_fixed_buffer(struct snd_pcm_substream *substream, int type, 1283 struct device *data, size_t size) 1284 { 1285 return snd_pcm_set_managed_buffer(substream, type, data, size, 0); 1286 } 1287 1288 /** 1289 * snd_pcm_set_fixed_buffer_all - Preallocate and set up the fixed size PCM buffer 1290 * @pcm: the pcm instance 1291 * @type: DMA type (SNDRV_DMA_TYPE_*) 1292 * @data: DMA type dependent data 1293 * @size: the requested pre-allocation size in bytes 1294 * 1295 * Apply the set up of the fixed buffer via snd_pcm_set_fixed_buffer() for 1296 * all substream. If any of allocation fails, it returns -ENOMEM, hence the 1297 * caller must check the return value. 1298 * 1299 * Return: zero if successful, or a negative error code 1300 */ 1301 static inline int __must_check 1302 snd_pcm_set_fixed_buffer_all(struct snd_pcm *pcm, int type, 1303 struct device *data, size_t size) 1304 { 1305 return snd_pcm_set_managed_buffer_all(pcm, type, data, size, 0); 1306 } 1307 1308 int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream, 1309 size_t size, gfp_t gfp_flags); 1310 int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream); 1311 struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream, 1312 unsigned long offset); 1313 /** 1314 * snd_pcm_lib_alloc_vmalloc_buffer - allocate virtual DMA buffer 1315 * @substream: the substream to allocate the buffer to 1316 * @size: the requested buffer size, in bytes 1317 * 1318 * Allocates the PCM substream buffer using vmalloc(), i.e., the memory is 1319 * contiguous in kernel virtual space, but not in physical memory. Use this 1320 * if the buffer is accessed by kernel code but not by device DMA. 1321 * 1322 * Return: 1 if the buffer was changed, 0 if not changed, or a negative error 1323 * code. 1324 */ 1325 static inline int snd_pcm_lib_alloc_vmalloc_buffer 1326 (struct snd_pcm_substream *substream, size_t size) 1327 { 1328 return _snd_pcm_lib_alloc_vmalloc_buffer(substream, size, 1329 GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO); 1330 } 1331 1332 /** 1333 * snd_pcm_lib_alloc_vmalloc_32_buffer - allocate 32-bit-addressable buffer 1334 * @substream: the substream to allocate the buffer to 1335 * @size: the requested buffer size, in bytes 1336 * 1337 * This function works like snd_pcm_lib_alloc_vmalloc_buffer(), but uses 1338 * vmalloc_32(), i.e., the pages are allocated from 32-bit-addressable memory. 1339 * 1340 * Return: 1 if the buffer was changed, 0 if not changed, or a negative error 1341 * code. 1342 */ 1343 static inline int snd_pcm_lib_alloc_vmalloc_32_buffer 1344 (struct snd_pcm_substream *substream, size_t size) 1345 { 1346 return _snd_pcm_lib_alloc_vmalloc_buffer(substream, size, 1347 GFP_KERNEL | GFP_DMA32 | __GFP_ZERO); 1348 } 1349 1350 #define snd_pcm_get_dma_buf(substream) ((substream)->runtime->dma_buffer_p) 1351 1352 /** 1353 * snd_pcm_sgbuf_get_addr - Get the DMA address at the corresponding offset 1354 * @substream: PCM substream 1355 * @ofs: byte offset 1356 * 1357 * Return: DMA address 1358 */ 1359 static inline dma_addr_t 1360 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs) 1361 { 1362 return snd_sgbuf_get_addr(snd_pcm_get_dma_buf(substream), ofs); 1363 } 1364 1365 /** 1366 * snd_pcm_sgbuf_get_chunk_size - Compute the max size that fits within the 1367 * contig. page from the given size 1368 * @substream: PCM substream 1369 * @ofs: byte offset 1370 * @size: byte size to examine 1371 * 1372 * Return: chunk size 1373 */ 1374 static inline unsigned int 1375 snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream, 1376 unsigned int ofs, unsigned int size) 1377 { 1378 return snd_sgbuf_get_chunk_size(snd_pcm_get_dma_buf(substream), ofs, size); 1379 } 1380 1381 /** 1382 * snd_pcm_mmap_data_open - increase the mmap counter 1383 * @area: VMA 1384 * 1385 * PCM mmap callback should handle this counter properly 1386 */ 1387 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area) 1388 { 1389 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data; 1390 atomic_inc(&substream->mmap_count); 1391 } 1392 1393 /** 1394 * snd_pcm_mmap_data_close - decrease the mmap counter 1395 * @area: VMA 1396 * 1397 * PCM mmap callback should handle this counter properly 1398 */ 1399 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area) 1400 { 1401 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data; 1402 atomic_dec(&substream->mmap_count); 1403 } 1404 1405 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 1406 struct vm_area_struct *area); 1407 /* mmap for io-memory area */ 1408 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 1409 #define SNDRV_PCM_INFO_MMAP_IOMEM SNDRV_PCM_INFO_MMAP 1410 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area); 1411 #else 1412 #define SNDRV_PCM_INFO_MMAP_IOMEM 0 1413 #define snd_pcm_lib_mmap_iomem NULL 1414 #endif 1415 1416 /** 1417 * snd_pcm_limit_isa_dma_size - Get the max size fitting with ISA DMA transfer 1418 * @dma: DMA number 1419 * @max: pointer to store the max size 1420 */ 1421 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max) 1422 { 1423 *max = dma < 4 ? 64 * 1024 : 128 * 1024; 1424 } 1425 1426 /* 1427 * Misc 1428 */ 1429 1430 #define SNDRV_PCM_DEFAULT_CON_SPDIF (IEC958_AES0_CON_EMPHASIS_NONE|\ 1431 (IEC958_AES1_CON_ORIGINAL<<8)|\ 1432 (IEC958_AES1_CON_PCM_CODER<<8)|\ 1433 (IEC958_AES3_CON_FS_48000<<24)) 1434 1435 const char *snd_pcm_format_name(snd_pcm_format_t format); 1436 1437 /** 1438 * snd_pcm_direction_name - Get a string naming the direction of a stream 1439 * @direction: Stream's direction, one of SNDRV_PCM_STREAM_XXX 1440 * 1441 * Returns a string naming the direction of the stream. 1442 */ 1443 static inline const char *snd_pcm_direction_name(int direction) 1444 { 1445 if (direction == SNDRV_PCM_STREAM_PLAYBACK) 1446 return "Playback"; 1447 else 1448 return "Capture"; 1449 } 1450 1451 /** 1452 * snd_pcm_stream_str - Get a string naming the direction of a stream 1453 * @substream: the pcm substream instance 1454 * 1455 * Return: A string naming the direction of the stream. 1456 */ 1457 static inline const char *snd_pcm_stream_str(struct snd_pcm_substream *substream) 1458 { 1459 return snd_pcm_direction_name(substream->stream); 1460 } 1461 1462 /* 1463 * PCM channel-mapping control API 1464 */ 1465 /* array element of channel maps */ 1466 struct snd_pcm_chmap_elem { 1467 unsigned char channels; 1468 unsigned char map[15]; 1469 }; 1470 1471 /* channel map information; retrieved via snd_kcontrol_chip() */ 1472 struct snd_pcm_chmap { 1473 struct snd_pcm *pcm; /* assigned PCM instance */ 1474 int stream; /* PLAYBACK or CAPTURE */ 1475 struct snd_kcontrol *kctl; 1476 const struct snd_pcm_chmap_elem *chmap; 1477 unsigned int max_channels; 1478 unsigned int channel_mask; /* optional: active channels bitmask */ 1479 void *private_data; /* optional: private data pointer */ 1480 }; 1481 1482 /** 1483 * snd_pcm_chmap_substream - get the PCM substream assigned to the given chmap info 1484 * @info: chmap information 1485 * @idx: the substream number index 1486 * 1487 * Return: the matched PCM substream, or NULL if not found 1488 */ 1489 static inline struct snd_pcm_substream * 1490 snd_pcm_chmap_substream(struct snd_pcm_chmap *info, unsigned int idx) 1491 { 1492 struct snd_pcm_substream *s; 1493 for (s = info->pcm->streams[info->stream].substream; s; s = s->next) 1494 if (s->number == idx) 1495 return s; 1496 return NULL; 1497 } 1498 1499 /* ALSA-standard channel maps (RL/RR prior to C/LFE) */ 1500 extern const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[]; 1501 /* Other world's standard channel maps (C/LFE prior to RL/RR) */ 1502 extern const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[]; 1503 1504 /* bit masks to be passed to snd_pcm_chmap.channel_mask field */ 1505 #define SND_PCM_CHMAP_MASK_24 ((1U << 2) | (1U << 4)) 1506 #define SND_PCM_CHMAP_MASK_246 (SND_PCM_CHMAP_MASK_24 | (1U << 6)) 1507 #define SND_PCM_CHMAP_MASK_2468 (SND_PCM_CHMAP_MASK_246 | (1U << 8)) 1508 1509 int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream, 1510 const struct snd_pcm_chmap_elem *chmap, 1511 int max_channels, 1512 unsigned long private_value, 1513 struct snd_pcm_chmap **info_ret); 1514 1515 /** 1516 * pcm_format_to_bits - Strong-typed conversion of pcm_format to bitwise 1517 * @pcm_format: PCM format 1518 * 1519 * Return: 64bit mask corresponding to the given PCM format 1520 */ 1521 static inline u64 pcm_format_to_bits(snd_pcm_format_t pcm_format) 1522 { 1523 return 1ULL << (__force int) pcm_format; 1524 } 1525 1526 /** 1527 * pcm_for_each_format - helper to iterate for each format type 1528 * @f: the iterator variable in snd_pcm_format_t type 1529 */ 1530 #define pcm_for_each_format(f) \ 1531 for ((f) = SNDRV_PCM_FORMAT_FIRST; \ 1532 (__force int)(f) <= (__force int)SNDRV_PCM_FORMAT_LAST; \ 1533 (f) = (__force snd_pcm_format_t)((__force int)(f) + 1)) 1534 1535 /* printk helpers */ 1536 #define pcm_err(pcm, fmt, args...) \ 1537 dev_err((pcm)->card->dev, fmt, ##args) 1538 #define pcm_warn(pcm, fmt, args...) \ 1539 dev_warn((pcm)->card->dev, fmt, ##args) 1540 #define pcm_dbg(pcm, fmt, args...) \ 1541 dev_dbg((pcm)->card->dev, fmt, ##args) 1542 1543 struct snd_pcm_status64 { 1544 snd_pcm_state_t state; /* stream state */ 1545 u8 rsvd[4]; 1546 s64 trigger_tstamp_sec; /* time when stream was started/stopped/paused */ 1547 s64 trigger_tstamp_nsec; 1548 s64 tstamp_sec; /* reference timestamp */ 1549 s64 tstamp_nsec; 1550 snd_pcm_uframes_t appl_ptr; /* appl ptr */ 1551 snd_pcm_uframes_t hw_ptr; /* hw ptr */ 1552 snd_pcm_sframes_t delay; /* current delay in frames */ 1553 snd_pcm_uframes_t avail; /* number of frames available */ 1554 snd_pcm_uframes_t avail_max; /* max frames available on hw since last status */ 1555 snd_pcm_uframes_t overrange; /* count of ADC (capture) overrange detections from last status */ 1556 snd_pcm_state_t suspended_state; /* suspended stream state */ 1557 __u32 audio_tstamp_data; /* needed for 64-bit alignment, used for configs/report to/from userspace */ 1558 s64 audio_tstamp_sec; /* sample counter, wall clock, PHC or on-demand sync'ed */ 1559 s64 audio_tstamp_nsec; 1560 s64 driver_tstamp_sec; /* useful in case reference system tstamp is reported with delay */ 1561 s64 driver_tstamp_nsec; 1562 __u32 audio_tstamp_accuracy; /* in ns units, only valid if indicated in audio_tstamp_data */ 1563 unsigned char reserved[52-4*sizeof(s64)]; /* must be filled with zero */ 1564 }; 1565 1566 #define SNDRV_PCM_IOCTL_STATUS64 _IOR('A', 0x20, struct snd_pcm_status64) 1567 #define SNDRV_PCM_IOCTL_STATUS_EXT64 _IOWR('A', 0x24, struct snd_pcm_status64) 1568 1569 struct snd_pcm_status32 { 1570 snd_pcm_state_t state; /* stream state */ 1571 s32 trigger_tstamp_sec; /* time when stream was started/stopped/paused */ 1572 s32 trigger_tstamp_nsec; 1573 s32 tstamp_sec; /* reference timestamp */ 1574 s32 tstamp_nsec; 1575 u32 appl_ptr; /* appl ptr */ 1576 u32 hw_ptr; /* hw ptr */ 1577 s32 delay; /* current delay in frames */ 1578 u32 avail; /* number of frames available */ 1579 u32 avail_max; /* max frames available on hw since last status */ 1580 u32 overrange; /* count of ADC (capture) overrange detections from last status */ 1581 snd_pcm_state_t suspended_state; /* suspended stream state */ 1582 u32 audio_tstamp_data; /* needed for 64-bit alignment, used for configs/report to/from userspace */ 1583 s32 audio_tstamp_sec; /* sample counter, wall clock, PHC or on-demand sync'ed */ 1584 s32 audio_tstamp_nsec; 1585 s32 driver_tstamp_sec; /* useful in case reference system tstamp is reported with delay */ 1586 s32 driver_tstamp_nsec; 1587 u32 audio_tstamp_accuracy; /* in ns units, only valid if indicated in audio_tstamp_data */ 1588 unsigned char reserved[52-4*sizeof(s32)]; /* must be filled with zero */ 1589 }; 1590 1591 #define SNDRV_PCM_IOCTL_STATUS32 _IOR('A', 0x20, struct snd_pcm_status32) 1592 #define SNDRV_PCM_IOCTL_STATUS_EXT32 _IOWR('A', 0x24, struct snd_pcm_status32) 1593 1594 #endif /* __SOUND_PCM_H */ 1595