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#include <linux/uio.h>
20
21#define snd_pcm_substream_chip(substream) ((substream)->private_data)
22#define snd_pcm_chip(pcm) ((pcm)->private_data)
23
24#if IS_ENABLED(CONFIG_SND_PCM_OSS)
25#include <sound/pcm_oss.h>
26#endif
27
28/*
29 * Hardware (lowlevel) section
30 */
31
32struct snd_pcm_hardware {
33 unsigned int info; /* SNDRV_PCM_INFO_* */
34 u64 formats; /* SNDRV_PCM_FMTBIT_* */
35 unsigned int rates; /* SNDRV_PCM_RATE_* */
36 unsigned int rate_min; /* min rate */
37 unsigned int rate_max; /* max rate */
38 unsigned int channels_min; /* min channels */
39 unsigned int channels_max; /* max channels */
40 size_t buffer_bytes_max; /* max buffer size */
41 size_t period_bytes_min; /* min period size */
42 size_t period_bytes_max; /* max period size */
43 unsigned int periods_min; /* min # of periods */
44 unsigned int periods_max; /* max # of periods */
45 size_t fifo_size; /* fifo size in bytes */
46};
47
48struct snd_pcm_status64;
49struct snd_pcm_substream;
50
51struct snd_pcm_audio_tstamp_config; /* definitions further down */
52struct snd_pcm_audio_tstamp_report;
53
54struct snd_pcm_ops {
55 int (*open)(struct snd_pcm_substream *substream);
56 int (*close)(struct snd_pcm_substream *substream);
57 int (*ioctl)(struct snd_pcm_substream * substream,
58 unsigned int cmd, void *arg);
59 int (*hw_params)(struct snd_pcm_substream *substream,
60 struct snd_pcm_hw_params *params);
61 int (*hw_free)(struct snd_pcm_substream *substream);
62 int (*prepare)(struct snd_pcm_substream *substream);
63 int (*trigger)(struct snd_pcm_substream *substream, int cmd);
64 int (*sync_stop)(struct snd_pcm_substream *substream);
65 snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *substream);
66 int (*get_time_info)(struct snd_pcm_substream *substream,
67 struct timespec64 *system_ts, struct timespec64 *audio_ts,
68 struct snd_pcm_audio_tstamp_config *audio_tstamp_config,
69 struct snd_pcm_audio_tstamp_report *audio_tstamp_report);
70 int (*fill_silence)(struct snd_pcm_substream *substream, int channel,
71 unsigned long pos, unsigned long bytes);
72 int (*copy)(struct snd_pcm_substream *substream, int channel,
73 unsigned long pos, struct iov_iter *iter, unsigned long bytes);
74 struct page *(*page)(struct snd_pcm_substream *substream,
75 unsigned long offset);
76 int (*mmap)(struct snd_pcm_substream *substream, struct vm_area_struct *vma);
77 int (*ack)(struct snd_pcm_substream *substream);
78};
79
80/*
81 *
82 */
83
84#if defined(CONFIG_SND_DYNAMIC_MINORS)
85#define SNDRV_PCM_DEVICES (SNDRV_OS_MINORS-2)
86#else
87#define SNDRV_PCM_DEVICES 8
88#endif
89
90#define SNDRV_PCM_IOCTL1_RESET 0
91/* 1 is absent slot. */
92#define SNDRV_PCM_IOCTL1_CHANNEL_INFO 2
93/* 3 is absent slot. */
94#define SNDRV_PCM_IOCTL1_FIFO_SIZE 4
95
96#define SNDRV_PCM_TRIGGER_STOP 0
97#define SNDRV_PCM_TRIGGER_START 1
98#define SNDRV_PCM_TRIGGER_PAUSE_PUSH 3
99#define SNDRV_PCM_TRIGGER_PAUSE_RELEASE 4
100#define SNDRV_PCM_TRIGGER_SUSPEND 5
101#define SNDRV_PCM_TRIGGER_RESUME 6
102#define SNDRV_PCM_TRIGGER_DRAIN 7
103
104#define SNDRV_PCM_POS_XRUN ((snd_pcm_uframes_t)-1)
105
106/* If you change this don't forget to change rates[] table in pcm_native.c */
107#define SNDRV_PCM_RATE_5512 (1U<<0) /* 5512Hz */
108#define SNDRV_PCM_RATE_8000 (1U<<1) /* 8000Hz */
109#define SNDRV_PCM_RATE_11025 (1U<<2) /* 11025Hz */
110#define SNDRV_PCM_RATE_16000 (1U<<3) /* 16000Hz */
111#define SNDRV_PCM_RATE_22050 (1U<<4) /* 22050Hz */
112#define SNDRV_PCM_RATE_32000 (1U<<5) /* 32000Hz */
113#define SNDRV_PCM_RATE_44100 (1U<<6) /* 44100Hz */
114#define SNDRV_PCM_RATE_48000 (1U<<7) /* 48000Hz */
115#define SNDRV_PCM_RATE_64000 (1U<<8) /* 64000Hz */
116#define SNDRV_PCM_RATE_88200 (1U<<9) /* 88200Hz */
117#define SNDRV_PCM_RATE_96000 (1U<<10) /* 96000Hz */
118#define SNDRV_PCM_RATE_176400 (1U<<11) /* 176400Hz */
119#define SNDRV_PCM_RATE_192000 (1U<<12) /* 192000Hz */
120#define SNDRV_PCM_RATE_352800 (1U<<13) /* 352800Hz */
121#define SNDRV_PCM_RATE_384000 (1U<<14) /* 384000Hz */
122
123#define SNDRV_PCM_RATE_CONTINUOUS (1U<<30) /* continuous range */
124#define SNDRV_PCM_RATE_KNOT (1U<<31) /* supports more non-continuos rates */
125
126#define SNDRV_PCM_RATE_8000_44100 (SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_11025|\
127 SNDRV_PCM_RATE_16000|SNDRV_PCM_RATE_22050|\
128 SNDRV_PCM_RATE_32000|SNDRV_PCM_RATE_44100)
129#define SNDRV_PCM_RATE_8000_48000 (SNDRV_PCM_RATE_8000_44100|SNDRV_PCM_RATE_48000)
130#define SNDRV_PCM_RATE_8000_96000 (SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_64000|\
131 SNDRV_PCM_RATE_88200|SNDRV_PCM_RATE_96000)
132#define SNDRV_PCM_RATE_8000_192000 (SNDRV_PCM_RATE_8000_96000|SNDRV_PCM_RATE_176400|\
133 SNDRV_PCM_RATE_192000)
134#define SNDRV_PCM_RATE_8000_384000 (SNDRV_PCM_RATE_8000_192000|\
135 SNDRV_PCM_RATE_352800|\
136 SNDRV_PCM_RATE_384000)
137#define _SNDRV_PCM_FMTBIT(fmt) (1ULL << (__force int)SNDRV_PCM_FORMAT_##fmt)
138#define SNDRV_PCM_FMTBIT_S8 _SNDRV_PCM_FMTBIT(S8)
139#define SNDRV_PCM_FMTBIT_U8 _SNDRV_PCM_FMTBIT(U8)
140#define SNDRV_PCM_FMTBIT_S16_LE _SNDRV_PCM_FMTBIT(S16_LE)
141#define SNDRV_PCM_FMTBIT_S16_BE _SNDRV_PCM_FMTBIT(S16_BE)
142#define SNDRV_PCM_FMTBIT_U16_LE _SNDRV_PCM_FMTBIT(U16_LE)
143#define SNDRV_PCM_FMTBIT_U16_BE _SNDRV_PCM_FMTBIT(U16_BE)
144#define SNDRV_PCM_FMTBIT_S24_LE _SNDRV_PCM_FMTBIT(S24_LE)
145#define SNDRV_PCM_FMTBIT_S24_BE _SNDRV_PCM_FMTBIT(S24_BE)
146#define SNDRV_PCM_FMTBIT_U24_LE _SNDRV_PCM_FMTBIT(U24_LE)
147#define SNDRV_PCM_FMTBIT_U24_BE _SNDRV_PCM_FMTBIT(U24_BE)
148// For S32/U32 formats, 'msbits' hardware parameter is often used to deliver information about the
149// available bit count in most significant bit. It's for the case of so-called 'left-justified' or
150// `right-padding` sample which has less width than 32 bit.
151#define SNDRV_PCM_FMTBIT_S32_LE _SNDRV_PCM_FMTBIT(S32_LE)
152#define SNDRV_PCM_FMTBIT_S32_BE _SNDRV_PCM_FMTBIT(S32_BE)
153#define SNDRV_PCM_FMTBIT_U32_LE _SNDRV_PCM_FMTBIT(U32_LE)
154#define SNDRV_PCM_FMTBIT_U32_BE _SNDRV_PCM_FMTBIT(U32_BE)
155#define SNDRV_PCM_FMTBIT_FLOAT_LE _SNDRV_PCM_FMTBIT(FLOAT_LE)
156#define SNDRV_PCM_FMTBIT_FLOAT_BE _SNDRV_PCM_FMTBIT(FLOAT_BE)
157#define SNDRV_PCM_FMTBIT_FLOAT64_LE _SNDRV_PCM_FMTBIT(FLOAT64_LE)
158#define SNDRV_PCM_FMTBIT_FLOAT64_BE _SNDRV_PCM_FMTBIT(FLOAT64_BE)
159#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_LE)
160#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_BE)
161#define SNDRV_PCM_FMTBIT_MU_LAW _SNDRV_PCM_FMTBIT(MU_LAW)
162#define SNDRV_PCM_FMTBIT_A_LAW _SNDRV_PCM_FMTBIT(A_LAW)
163#define SNDRV_PCM_FMTBIT_IMA_ADPCM _SNDRV_PCM_FMTBIT(IMA_ADPCM)
164#define SNDRV_PCM_FMTBIT_MPEG _SNDRV_PCM_FMTBIT(MPEG)
165#define SNDRV_PCM_FMTBIT_GSM _SNDRV_PCM_FMTBIT(GSM)
166#define SNDRV_PCM_FMTBIT_S20_LE _SNDRV_PCM_FMTBIT(S20_LE)
167#define SNDRV_PCM_FMTBIT_U20_LE _SNDRV_PCM_FMTBIT(U20_LE)
168#define SNDRV_PCM_FMTBIT_S20_BE _SNDRV_PCM_FMTBIT(S20_BE)
169#define SNDRV_PCM_FMTBIT_U20_BE _SNDRV_PCM_FMTBIT(U20_BE)
170#define SNDRV_PCM_FMTBIT_SPECIAL _SNDRV_PCM_FMTBIT(SPECIAL)
171#define SNDRV_PCM_FMTBIT_S24_3LE _SNDRV_PCM_FMTBIT(S24_3LE)
172#define SNDRV_PCM_FMTBIT_U24_3LE _SNDRV_PCM_FMTBIT(U24_3LE)
173#define SNDRV_PCM_FMTBIT_S24_3BE _SNDRV_PCM_FMTBIT(S24_3BE)
174#define SNDRV_PCM_FMTBIT_U24_3BE _SNDRV_PCM_FMTBIT(U24_3BE)
175#define SNDRV_PCM_FMTBIT_S20_3LE _SNDRV_PCM_FMTBIT(S20_3LE)
176#define SNDRV_PCM_FMTBIT_U20_3LE _SNDRV_PCM_FMTBIT(U20_3LE)
177#define SNDRV_PCM_FMTBIT_S20_3BE _SNDRV_PCM_FMTBIT(S20_3BE)
178#define SNDRV_PCM_FMTBIT_U20_3BE _SNDRV_PCM_FMTBIT(U20_3BE)
179#define SNDRV_PCM_FMTBIT_S18_3LE _SNDRV_PCM_FMTBIT(S18_3LE)
180#define SNDRV_PCM_FMTBIT_U18_3LE _SNDRV_PCM_FMTBIT(U18_3LE)
181#define SNDRV_PCM_FMTBIT_S18_3BE _SNDRV_PCM_FMTBIT(S18_3BE)
182#define SNDRV_PCM_FMTBIT_U18_3BE _SNDRV_PCM_FMTBIT(U18_3BE)
183#define SNDRV_PCM_FMTBIT_G723_24 _SNDRV_PCM_FMTBIT(G723_24)
184#define SNDRV_PCM_FMTBIT_G723_24_1B _SNDRV_PCM_FMTBIT(G723_24_1B)
185#define SNDRV_PCM_FMTBIT_G723_40 _SNDRV_PCM_FMTBIT(G723_40)
186#define SNDRV_PCM_FMTBIT_G723_40_1B _SNDRV_PCM_FMTBIT(G723_40_1B)
187#define SNDRV_PCM_FMTBIT_DSD_U8 _SNDRV_PCM_FMTBIT(DSD_U8)
188#define SNDRV_PCM_FMTBIT_DSD_U16_LE _SNDRV_PCM_FMTBIT(DSD_U16_LE)
189#define SNDRV_PCM_FMTBIT_DSD_U32_LE _SNDRV_PCM_FMTBIT(DSD_U32_LE)
190#define SNDRV_PCM_FMTBIT_DSD_U16_BE _SNDRV_PCM_FMTBIT(DSD_U16_BE)
191#define SNDRV_PCM_FMTBIT_DSD_U32_BE _SNDRV_PCM_FMTBIT(DSD_U32_BE)
192
193#ifdef SNDRV_LITTLE_ENDIAN
194#define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_LE
195#define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_LE
196#define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_LE
197#define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_LE
198#define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_LE
199#define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_LE
200#define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_LE
201#define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_LE
202#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE
203#define SNDRV_PCM_FMTBIT_S20 SNDRV_PCM_FMTBIT_S20_LE
204#define SNDRV_PCM_FMTBIT_U20 SNDRV_PCM_FMTBIT_U20_LE
205#endif
206#ifdef SNDRV_BIG_ENDIAN
207#define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_BE
208#define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_BE
209#define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_BE
210#define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_BE
211#define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_BE
212#define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_BE
213#define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_BE
214#define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_BE
215#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE
216#define SNDRV_PCM_FMTBIT_S20 SNDRV_PCM_FMTBIT_S20_BE
217#define SNDRV_PCM_FMTBIT_U20 SNDRV_PCM_FMTBIT_U20_BE
218#endif
219
220struct snd_pcm_file {
221 struct snd_pcm_substream *substream;
222 int no_compat_mmap;
223 unsigned int user_pversion; /* supported protocol version */
224};
225
226struct snd_pcm_hw_rule;
227typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params,
228 struct snd_pcm_hw_rule *rule);
229
230struct snd_pcm_hw_rule {
231 unsigned int cond;
232 int var;
233 int deps[5];
234
235 snd_pcm_hw_rule_func_t func;
236 void *private;
237};
238
239struct snd_pcm_hw_constraints {
240 struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK -
241 SNDRV_PCM_HW_PARAM_FIRST_MASK + 1];
242 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL -
243 SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
244 unsigned int rules_num;
245 unsigned int rules_all;
246 struct snd_pcm_hw_rule *rules;
247};
248
249static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs,
250 snd_pcm_hw_param_t var)
251{
252 return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
253}
254
255static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs,
256 snd_pcm_hw_param_t var)
257{
258 return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
259}
260
261struct snd_ratnum {
262 unsigned int num;
263 unsigned int den_min, den_max, den_step;
264};
265
266struct snd_ratden {
267 unsigned int num_min, num_max, num_step;
268 unsigned int den;
269};
270
271struct snd_pcm_hw_constraint_ratnums {
272 int nrats;
273 const struct snd_ratnum *rats;
274};
275
276struct snd_pcm_hw_constraint_ratdens {
277 int nrats;
278 const struct snd_ratden *rats;
279};
280
281struct snd_pcm_hw_constraint_list {
282 const unsigned int *list;
283 unsigned int count;
284 unsigned int mask;
285};
286
287struct snd_pcm_hw_constraint_ranges {
288 unsigned int count;
289 const struct snd_interval *ranges;
290 unsigned int mask;
291};
292
293/*
294 * userspace-provided audio timestamp config to kernel,
295 * structure is for internal use only and filled with dedicated unpack routine
296 */
297struct snd_pcm_audio_tstamp_config {
298 /* 5 of max 16 bits used */
299 u32 type_requested:4;
300 u32 report_delay:1; /* add total delay to A/D or D/A */
301};
302
303static inline void snd_pcm_unpack_audio_tstamp_config(__u32 data,
304 struct snd_pcm_audio_tstamp_config *config)
305{
306 config->type_requested = data & 0xF;
307 config->report_delay = (data >> 4) & 1;
308}
309
310/*
311 * kernel-provided audio timestamp report to user-space
312 * structure is for internal use only and read by dedicated pack routine
313 */
314struct snd_pcm_audio_tstamp_report {
315 /* 6 of max 16 bits used for bit-fields */
316
317 /* for backwards compatibility */
318 u32 valid:1;
319
320 /* actual type if hardware could not support requested timestamp */
321 u32 actual_type:4;
322
323 /* accuracy represented in ns units */
324 u32 accuracy_report:1; /* 0 if accuracy unknown, 1 if accuracy field is valid */
325 u32 accuracy; /* up to 4.29s, will be packed in separate field */
326};
327
328static inline void snd_pcm_pack_audio_tstamp_report(__u32 *data, __u32 *accuracy,
329 const struct snd_pcm_audio_tstamp_report *report)
330{
331 u32 tmp;
332
333 tmp = report->accuracy_report;
334 tmp <<= 4;
335 tmp |= report->actual_type;
336 tmp <<= 1;
337 tmp |= report->valid;
338
339 *data &= 0xffff; /* zero-clear MSBs */
340 *data |= (tmp << 16);
341 *accuracy = report->accuracy;
342}
343
344
345struct snd_pcm_runtime {
346 /* -- Status -- */
347 snd_pcm_state_t state; /* stream state */
348 snd_pcm_state_t suspended_state; /* suspended stream state */
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; see struct snd_pcm_sw_params for comments -- */
380 int tstamp_mode;
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;
385 snd_pcm_uframes_t silence_size;
386 snd_pcm_uframes_t boundary;
387
388 /* internal data of auto-silencer */
389 snd_pcm_uframes_t silence_start; /* starting pointer to silence area */
390 snd_pcm_uframes_t silence_filled; /* already filled part of silence area */
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
438struct 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
445struct pid;
446
447struct 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
493struct 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
514struct 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
540extern const struct file_operations snd_pcm_f_ops[2];
541
542int snd_pcm_new(struct snd_card *card, const char *id, int device,
543 int playback_count, int capture_count,
544 struct snd_pcm **rpcm);
545int 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);
548int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
549
550#if IS_ENABLED(CONFIG_SND_PCM_OSS)
551struct 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};
557int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
558#endif
559
560/*
561 * Native I/O
562 */
563
564int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
565int snd_pcm_info_user(struct snd_pcm_substream *substream,
566 struct snd_pcm_info __user *info);
567int snd_pcm_status64(struct snd_pcm_substream *substream,
568 struct snd_pcm_status64 *status);
569int snd_pcm_start(struct snd_pcm_substream *substream);
570int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t status);
571int snd_pcm_drain_done(struct snd_pcm_substream *substream);
572int snd_pcm_stop_xrun(struct snd_pcm_substream *substream);
573#ifdef CONFIG_PM
574int snd_pcm_suspend_all(struct snd_pcm *pcm);
575#else
576static inline int snd_pcm_suspend_all(struct snd_pcm *pcm)
577{
578 return 0;
579}
580#endif
581int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
582int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
583 struct snd_pcm_substream **rsubstream);
584void snd_pcm_release_substream(struct snd_pcm_substream *substream);
585int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
586 struct snd_pcm_substream **rsubstream);
587void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
588int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
589
590
591#ifdef CONFIG_SND_DEBUG
592void snd_pcm_debug_name(struct snd_pcm_substream *substream,
593 char *name, size_t len);
594#else
595static inline void
596snd_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 */
612static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
613{
614 return substream->group != &substream->self_group;
615}
616
617void snd_pcm_stream_lock(struct snd_pcm_substream *substream);
618void snd_pcm_stream_unlock(struct snd_pcm_substream *substream);
619void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream);
620void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream);
621unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream);
622unsigned 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)
638void 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 */
679static inline int snd_pcm_running(struct snd_pcm_substream *substream)
680{
681 return (substream->runtime->state == SNDRV_PCM_STATE_RUNNING ||
682 (substream->runtime->state == SNDRV_PCM_STATE_DRAINING &&
683 substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
684}
685
686/**
687 * __snd_pcm_set_state - Change the current PCM state
688 * @runtime: PCM runtime to set
689 * @state: the current state to set
690 *
691 * Call within the stream lock
692 */
693static inline void __snd_pcm_set_state(struct snd_pcm_runtime *runtime,
694 snd_pcm_state_t state)
695{
696 runtime->state = state;
697 runtime->status->state = state; /* copy for mmap */
698}
699
700/**
701 * bytes_to_samples - Unit conversion of the size from bytes to samples
702 * @runtime: PCM runtime instance
703 * @size: size in bytes
704 *
705 * Return: the size in samples
706 */
707static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
708{
709 return size * 8 / runtime->sample_bits;
710}
711
712/**
713 * bytes_to_frames - Unit conversion of the size from bytes to frames
714 * @runtime: PCM runtime instance
715 * @size: size in bytes
716 *
717 * Return: the size in frames
718 */
719static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
720{
721 return size * 8 / runtime->frame_bits;
722}
723
724/**
725 * samples_to_bytes - Unit conversion of the size from samples to bytes
726 * @runtime: PCM runtime instance
727 * @size: size in samples
728 *
729 * Return: the byte size
730 */
731static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
732{
733 return size * runtime->sample_bits / 8;
734}
735
736/**
737 * frames_to_bytes - Unit conversion of the size from frames to bytes
738 * @runtime: PCM runtime instance
739 * @size: size in frames
740 *
741 * Return: the byte size
742 */
743static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
744{
745 return size * runtime->frame_bits / 8;
746}
747
748/**
749 * frame_aligned - Check whether the byte size is aligned to frames
750 * @runtime: PCM runtime instance
751 * @bytes: size in bytes
752 *
753 * Return: true if aligned, or false if not
754 */
755static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
756{
757 return bytes % runtime->byte_align == 0;
758}
759
760/**
761 * snd_pcm_lib_buffer_bytes - Get the buffer size of the current PCM in bytes
762 * @substream: PCM substream
763 *
764 * Return: buffer byte size
765 */
766static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
767{
768 struct snd_pcm_runtime *runtime = substream->runtime;
769 return frames_to_bytes(runtime, size: runtime->buffer_size);
770}
771
772/**
773 * snd_pcm_lib_period_bytes - Get the period size of the current PCM in bytes
774 * @substream: PCM substream
775 *
776 * Return: period byte size
777 */
778static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
779{
780 struct snd_pcm_runtime *runtime = substream->runtime;
781 return frames_to_bytes(runtime, size: runtime->period_size);
782}
783
784/**
785 * snd_pcm_playback_avail - Get the available (writable) space for playback
786 * @runtime: PCM runtime instance
787 *
788 * Result is between 0 ... (boundary - 1)
789 *
790 * Return: available frame size
791 */
792static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
793{
794 snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
795 if (avail < 0)
796 avail += runtime->boundary;
797 else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
798 avail -= runtime->boundary;
799 return avail;
800}
801
802/**
803 * snd_pcm_capture_avail - Get the available (readable) space for capture
804 * @runtime: PCM runtime instance
805 *
806 * Result is between 0 ... (boundary - 1)
807 *
808 * Return: available frame size
809 */
810static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
811{
812 snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
813 if (avail < 0)
814 avail += runtime->boundary;
815 return avail;
816}
817
818/**
819 * snd_pcm_playback_hw_avail - Get the queued space for playback
820 * @runtime: PCM runtime instance
821 *
822 * Return: available frame size
823 */
824static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
825{
826 return runtime->buffer_size - snd_pcm_playback_avail(runtime);
827}
828
829/**
830 * snd_pcm_capture_hw_avail - Get the free space for capture
831 * @runtime: PCM runtime instance
832 *
833 * Return: available frame size
834 */
835static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
836{
837 return runtime->buffer_size - snd_pcm_capture_avail(runtime);
838}
839
840/**
841 * snd_pcm_playback_ready - check whether the playback buffer is available
842 * @substream: the pcm substream instance
843 *
844 * Checks whether enough free space is available on the playback buffer.
845 *
846 * Return: Non-zero if available, or zero if not.
847 */
848static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
849{
850 struct snd_pcm_runtime *runtime = substream->runtime;
851 return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
852}
853
854/**
855 * snd_pcm_capture_ready - check whether the capture buffer is available
856 * @substream: the pcm substream instance
857 *
858 * Checks whether enough capture data is available on the capture buffer.
859 *
860 * Return: Non-zero if available, or zero if not.
861 */
862static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
863{
864 struct snd_pcm_runtime *runtime = substream->runtime;
865 return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
866}
867
868/**
869 * snd_pcm_playback_data - check whether any data exists on the playback buffer
870 * @substream: the pcm substream instance
871 *
872 * Checks whether any data exists on the playback buffer.
873 *
874 * Return: Non-zero if any data exists, or zero if not. If stop_threshold
875 * is bigger or equal to boundary, then this function returns always non-zero.
876 */
877static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
878{
879 struct snd_pcm_runtime *runtime = substream->runtime;
880
881 if (runtime->stop_threshold >= runtime->boundary)
882 return 1;
883 return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
884}
885
886/**
887 * snd_pcm_playback_empty - check whether the playback buffer is empty
888 * @substream: the pcm substream instance
889 *
890 * Checks whether the playback buffer is empty.
891 *
892 * Return: Non-zero if empty, or zero if not.
893 */
894static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
895{
896 struct snd_pcm_runtime *runtime = substream->runtime;
897 return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
898}
899
900/**
901 * snd_pcm_capture_empty - check whether the capture buffer is empty
902 * @substream: the pcm substream instance
903 *
904 * Checks whether the capture buffer is empty.
905 *
906 * Return: Non-zero if empty, or zero if not.
907 */
908static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
909{
910 struct snd_pcm_runtime *runtime = substream->runtime;
911 return snd_pcm_capture_avail(runtime) == 0;
912}
913
914/**
915 * snd_pcm_trigger_done - Mark the master substream
916 * @substream: the pcm substream instance
917 * @master: the linked master substream
918 *
919 * When multiple substreams of the same card are linked and the hardware
920 * supports the single-shot operation, the driver calls this in the loop
921 * in snd_pcm_group_for_each_entry() for marking the substream as "done".
922 * Then most of trigger operations are performed only to the given master
923 * substream.
924 *
925 * The trigger_master mark is cleared at timestamp updates at the end
926 * of trigger operations.
927 */
928static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream,
929 struct snd_pcm_substream *master)
930{
931 substream->runtime->trigger_master = master;
932}
933
934static inline int hw_is_mask(int var)
935{
936 return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
937 var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
938}
939
940static inline int hw_is_interval(int var)
941{
942 return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
943 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
944}
945
946static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
947 snd_pcm_hw_param_t var)
948{
949 return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
950}
951
952static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
953 snd_pcm_hw_param_t var)
954{
955 return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
956}
957
958static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
959 snd_pcm_hw_param_t var)
960{
961 return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
962}
963
964static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
965 snd_pcm_hw_param_t var)
966{
967 return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
968}
969
970/**
971 * params_channels - Get the number of channels from the hw params
972 * @p: hw params
973 *
974 * Return: the number of channels
975 */
976static inline unsigned int params_channels(const struct snd_pcm_hw_params *p)
977{
978 return hw_param_interval_c(params: p, SNDRV_PCM_HW_PARAM_CHANNELS)->min;
979}
980
981/**
982 * params_rate - Get the sample rate from the hw params
983 * @p: hw params
984 *
985 * Return: the sample rate
986 */
987static inline unsigned int params_rate(const struct snd_pcm_hw_params *p)
988{
989 return hw_param_interval_c(params: p, SNDRV_PCM_HW_PARAM_RATE)->min;
990}
991
992/**
993 * params_period_size - Get the period size (in frames) from the hw params
994 * @p: hw params
995 *
996 * Return: the period size in frames
997 */
998static inline unsigned int params_period_size(const struct snd_pcm_hw_params *p)
999{
1000 return hw_param_interval_c(params: p, SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min;
1001}
1002
1003/**
1004 * params_periods - Get the number of periods from the hw params
1005 * @p: hw params
1006 *
1007 * Return: the number of periods
1008 */
1009static inline unsigned int params_periods(const struct snd_pcm_hw_params *p)
1010{
1011 return hw_param_interval_c(params: p, SNDRV_PCM_HW_PARAM_PERIODS)->min;
1012}
1013
1014/**
1015 * params_buffer_size - Get the buffer size (in frames) from the hw params
1016 * @p: hw params
1017 *
1018 * Return: the buffer size in frames
1019 */
1020static inline unsigned int params_buffer_size(const struct snd_pcm_hw_params *p)
1021{
1022 return hw_param_interval_c(params: p, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min;
1023}
1024
1025/**
1026 * params_buffer_bytes - Get the buffer size (in bytes) from the hw params
1027 * @p: hw params
1028 *
1029 * Return: the buffer size in bytes
1030 */
1031static inline unsigned int params_buffer_bytes(const struct snd_pcm_hw_params *p)
1032{
1033 return hw_param_interval_c(params: p, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min;
1034}
1035
1036int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
1037int snd_interval_list(struct snd_interval *i, unsigned int count,
1038 const unsigned int *list, unsigned int mask);
1039int snd_interval_ranges(struct snd_interval *i, unsigned int count,
1040 const struct snd_interval *list, unsigned int mask);
1041int snd_interval_ratnum(struct snd_interval *i,
1042 unsigned int rats_count, const struct snd_ratnum *rats,
1043 unsigned int *nump, unsigned int *denp);
1044
1045void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
1046void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
1047
1048int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
1049
1050int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1051 u_int64_t mask);
1052int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1053 unsigned int min, unsigned int max);
1054int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
1055int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
1056 unsigned int cond,
1057 snd_pcm_hw_param_t var,
1058 const struct snd_pcm_hw_constraint_list *l);
1059int snd_pcm_hw_constraint_ranges(struct snd_pcm_runtime *runtime,
1060 unsigned int cond,
1061 snd_pcm_hw_param_t var,
1062 const struct snd_pcm_hw_constraint_ranges *r);
1063int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
1064 unsigned int cond,
1065 snd_pcm_hw_param_t var,
1066 const struct snd_pcm_hw_constraint_ratnums *r);
1067int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1068 unsigned int cond,
1069 snd_pcm_hw_param_t var,
1070 const struct snd_pcm_hw_constraint_ratdens *r);
1071int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1072 unsigned int cond,
1073 unsigned int width,
1074 unsigned int msbits);
1075int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1076 unsigned int cond,
1077 snd_pcm_hw_param_t var,
1078 unsigned long step);
1079int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1080 unsigned int cond,
1081 snd_pcm_hw_param_t var);
1082int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
1083 unsigned int base_rate);
1084int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
1085 unsigned int cond,
1086 int var,
1087 snd_pcm_hw_rule_func_t func, void *private,
1088 int dep, ...);
1089
1090/**
1091 * snd_pcm_hw_constraint_single() - Constrain parameter to a single value
1092 * @runtime: PCM runtime instance
1093 * @var: The hw_params variable to constrain
1094 * @val: The value to constrain to
1095 *
1096 * Return: Positive if the value is changed, zero if it's not changed, or a
1097 * negative error code.
1098 */
1099static inline int snd_pcm_hw_constraint_single(
1100 struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1101 unsigned int val)
1102{
1103 return snd_pcm_hw_constraint_minmax(runtime, var, min: val, max: val);
1104}
1105
1106int snd_pcm_format_signed(snd_pcm_format_t format);
1107int snd_pcm_format_unsigned(snd_pcm_format_t format);
1108int snd_pcm_format_linear(snd_pcm_format_t format);
1109int snd_pcm_format_little_endian(snd_pcm_format_t format);
1110int snd_pcm_format_big_endian(snd_pcm_format_t format);
1111#if 0 /* just for kernel-doc */
1112/**
1113 * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
1114 * @format: the format to check
1115 *
1116 * Return: 1 if the given PCM format is CPU-endian, 0 if
1117 * opposite, or a negative error code if endian not specified.
1118 */
1119int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
1120#endif /* DocBook */
1121#ifdef SNDRV_LITTLE_ENDIAN
1122#define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
1123#else
1124#define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
1125#endif
1126int snd_pcm_format_width(snd_pcm_format_t format); /* in bits */
1127int snd_pcm_format_physical_width(snd_pcm_format_t format); /* in bits */
1128ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
1129const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
1130int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
1131
1132void snd_pcm_set_ops(struct snd_pcm * pcm, int direction,
1133 const struct snd_pcm_ops *ops);
1134void snd_pcm_set_sync(struct snd_pcm_substream *substream);
1135int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1136 unsigned int cmd, void *arg);
1137void snd_pcm_period_elapsed_under_stream_lock(struct snd_pcm_substream *substream);
1138void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
1139snd_pcm_sframes_t __snd_pcm_lib_xfer(struct snd_pcm_substream *substream,
1140 void *buf, bool interleaved,
1141 snd_pcm_uframes_t frames, bool in_kernel);
1142
1143static inline snd_pcm_sframes_t
1144snd_pcm_lib_write(struct snd_pcm_substream *substream,
1145 const void __user *buf, snd_pcm_uframes_t frames)
1146{
1147 return __snd_pcm_lib_xfer(substream, buf: (void __force *)buf, interleaved: true, frames, in_kernel: false);
1148}
1149
1150static inline snd_pcm_sframes_t
1151snd_pcm_lib_read(struct snd_pcm_substream *substream,
1152 void __user *buf, snd_pcm_uframes_t frames)
1153{
1154 return __snd_pcm_lib_xfer(substream, buf: (void __force *)buf, interleaved: true, frames, in_kernel: false);
1155}
1156
1157static inline snd_pcm_sframes_t
1158snd_pcm_lib_writev(struct snd_pcm_substream *substream,
1159 void __user **bufs, snd_pcm_uframes_t frames)
1160{
1161 return __snd_pcm_lib_xfer(substream, buf: (void *)bufs, interleaved: false, frames, in_kernel: false);
1162}
1163
1164static inline snd_pcm_sframes_t
1165snd_pcm_lib_readv(struct snd_pcm_substream *substream,
1166 void __user **bufs, snd_pcm_uframes_t frames)
1167{
1168 return __snd_pcm_lib_xfer(substream, buf: (void *)bufs, interleaved: false, frames, in_kernel: false);
1169}
1170
1171static inline snd_pcm_sframes_t
1172snd_pcm_kernel_write(struct snd_pcm_substream *substream,
1173 const void *buf, snd_pcm_uframes_t frames)
1174{
1175 return __snd_pcm_lib_xfer(substream, buf: (void *)buf, interleaved: true, frames, in_kernel: true);
1176}
1177
1178static inline snd_pcm_sframes_t
1179snd_pcm_kernel_read(struct snd_pcm_substream *substream,
1180 void *buf, snd_pcm_uframes_t frames)
1181{
1182 return __snd_pcm_lib_xfer(substream, buf, interleaved: true, frames, in_kernel: true);
1183}
1184
1185static inline snd_pcm_sframes_t
1186snd_pcm_kernel_writev(struct snd_pcm_substream *substream,
1187 void **bufs, snd_pcm_uframes_t frames)
1188{
1189 return __snd_pcm_lib_xfer(substream, buf: bufs, interleaved: false, frames, in_kernel: true);
1190}
1191
1192static inline snd_pcm_sframes_t
1193snd_pcm_kernel_readv(struct snd_pcm_substream *substream,
1194 void **bufs, snd_pcm_uframes_t frames)
1195{
1196 return __snd_pcm_lib_xfer(substream, buf: bufs, interleaved: false, frames, in_kernel: true);
1197}
1198
1199int snd_pcm_hw_limit_rates(struct snd_pcm_hardware *hw);
1200
1201static inline int
1202snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime)
1203{
1204 return snd_pcm_hw_limit_rates(hw: &runtime->hw);
1205}
1206
1207unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate);
1208unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit);
1209unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a,
1210 unsigned int rates_b);
1211unsigned int snd_pcm_rate_range_to_bits(unsigned int rate_min,
1212 unsigned int rate_max);
1213
1214/**
1215 * snd_pcm_set_runtime_buffer - Set the PCM runtime buffer
1216 * @substream: PCM substream to set
1217 * @bufp: the buffer information, NULL to clear
1218 *
1219 * Copy the buffer information to runtime->dma_buffer when @bufp is non-NULL.
1220 * Otherwise it clears the current buffer information.
1221 */
1222static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
1223 struct snd_dma_buffer *bufp)
1224{
1225 struct snd_pcm_runtime *runtime = substream->runtime;
1226 if (bufp) {
1227 runtime->dma_buffer_p = bufp;
1228 runtime->dma_area = bufp->area;
1229 runtime->dma_addr = bufp->addr;
1230 runtime->dma_bytes = bufp->bytes;
1231 } else {
1232 runtime->dma_buffer_p = NULL;
1233 runtime->dma_area = NULL;
1234 runtime->dma_addr = 0;
1235 runtime->dma_bytes = 0;
1236 }
1237}
1238
1239/**
1240 * snd_pcm_gettime - Fill the timespec64 depending on the timestamp mode
1241 * @runtime: PCM runtime instance
1242 * @tv: timespec64 to fill
1243 */
1244static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime,
1245 struct timespec64 *tv)
1246{
1247 switch (runtime->tstamp_type) {
1248 case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC:
1249 ktime_get_ts64(ts: tv);
1250 break;
1251 case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC_RAW:
1252 ktime_get_raw_ts64(ts: tv);
1253 break;
1254 default:
1255 ktime_get_real_ts64(tv);
1256 break;
1257 }
1258}
1259
1260/*
1261 * Memory
1262 */
1263
1264void snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
1265void snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
1266void snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
1267 int type, struct device *data,
1268 size_t size, size_t max);
1269void snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
1270 int type, void *data,
1271 size_t size, size_t max);
1272int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
1273int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
1274
1275int snd_pcm_set_managed_buffer(struct snd_pcm_substream *substream, int type,
1276 struct device *data, size_t size, size_t max);
1277int snd_pcm_set_managed_buffer_all(struct snd_pcm *pcm, int type,
1278 struct device *data,
1279 size_t size, size_t max);
1280
1281/**
1282 * snd_pcm_set_fixed_buffer - Preallocate and set up the fixed size PCM buffer
1283 * @substream: the pcm substream instance
1284 * @type: DMA type (SNDRV_DMA_TYPE_*)
1285 * @data: DMA type dependent data
1286 * @size: the requested pre-allocation size in bytes
1287 *
1288 * This is a variant of snd_pcm_set_managed_buffer(), but this pre-allocates
1289 * only the given sized buffer and doesn't allow re-allocation nor dynamic
1290 * allocation of a larger buffer unlike the standard one.
1291 * The function may return -ENOMEM error, hence the caller must check it.
1292 *
1293 * Return: zero if successful, or a negative error code
1294 */
1295static inline int __must_check
1296snd_pcm_set_fixed_buffer(struct snd_pcm_substream *substream, int type,
1297 struct device *data, size_t size)
1298{
1299 return snd_pcm_set_managed_buffer(substream, type, data, size, max: 0);
1300}
1301
1302/**
1303 * snd_pcm_set_fixed_buffer_all - Preallocate and set up the fixed size PCM buffer
1304 * @pcm: the pcm instance
1305 * @type: DMA type (SNDRV_DMA_TYPE_*)
1306 * @data: DMA type dependent data
1307 * @size: the requested pre-allocation size in bytes
1308 *
1309 * Apply the set up of the fixed buffer via snd_pcm_set_fixed_buffer() for
1310 * all substream. If any of allocation fails, it returns -ENOMEM, hence the
1311 * caller must check the return value.
1312 *
1313 * Return: zero if successful, or a negative error code
1314 */
1315static inline int __must_check
1316snd_pcm_set_fixed_buffer_all(struct snd_pcm *pcm, int type,
1317 struct device *data, size_t size)
1318{
1319 return snd_pcm_set_managed_buffer_all(pcm, type, data, size, max: 0);
1320}
1321
1322int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream,
1323 size_t size, gfp_t gfp_flags);
1324int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream);
1325struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream,
1326 unsigned long offset);
1327/**
1328 * snd_pcm_lib_alloc_vmalloc_buffer - allocate virtual DMA buffer
1329 * @substream: the substream to allocate the buffer to
1330 * @size: the requested buffer size, in bytes
1331 *
1332 * Allocates the PCM substream buffer using vmalloc(), i.e., the memory is
1333 * contiguous in kernel virtual space, but not in physical memory. Use this
1334 * if the buffer is accessed by kernel code but not by device DMA.
1335 *
1336 * Return: 1 if the buffer was changed, 0 if not changed, or a negative error
1337 * code.
1338 */
1339static inline int snd_pcm_lib_alloc_vmalloc_buffer
1340 (struct snd_pcm_substream *substream, size_t size)
1341{
1342 return _snd_pcm_lib_alloc_vmalloc_buffer(substream, size,
1343 GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
1344}
1345
1346/**
1347 * snd_pcm_lib_alloc_vmalloc_32_buffer - allocate 32-bit-addressable buffer
1348 * @substream: the substream to allocate the buffer to
1349 * @size: the requested buffer size, in bytes
1350 *
1351 * This function works like snd_pcm_lib_alloc_vmalloc_buffer(), but uses
1352 * vmalloc_32(), i.e., the pages are allocated from 32-bit-addressable memory.
1353 *
1354 * Return: 1 if the buffer was changed, 0 if not changed, or a negative error
1355 * code.
1356 */
1357static inline int snd_pcm_lib_alloc_vmalloc_32_buffer
1358 (struct snd_pcm_substream *substream, size_t size)
1359{
1360 return _snd_pcm_lib_alloc_vmalloc_buffer(substream, size,
1361 GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1362}
1363
1364#define snd_pcm_get_dma_buf(substream) ((substream)->runtime->dma_buffer_p)
1365
1366/**
1367 * snd_pcm_sgbuf_get_addr - Get the DMA address at the corresponding offset
1368 * @substream: PCM substream
1369 * @ofs: byte offset
1370 *
1371 * Return: DMA address
1372 */
1373static inline dma_addr_t
1374snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
1375{
1376 return snd_sgbuf_get_addr(snd_pcm_get_dma_buf(substream), offset: ofs);
1377}
1378
1379/**
1380 * snd_pcm_sgbuf_get_chunk_size - Compute the max size that fits within the
1381 * contig. page from the given size
1382 * @substream: PCM substream
1383 * @ofs: byte offset
1384 * @size: byte size to examine
1385 *
1386 * Return: chunk size
1387 */
1388static inline unsigned int
1389snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
1390 unsigned int ofs, unsigned int size)
1391{
1392 return snd_sgbuf_get_chunk_size(snd_pcm_get_dma_buf(substream), ofs, size);
1393}
1394
1395/**
1396 * snd_pcm_mmap_data_open - increase the mmap counter
1397 * @area: VMA
1398 *
1399 * PCM mmap callback should handle this counter properly
1400 */
1401static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
1402{
1403 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1404 atomic_inc(v: &substream->mmap_count);
1405}
1406
1407/**
1408 * snd_pcm_mmap_data_close - decrease the mmap counter
1409 * @area: VMA
1410 *
1411 * PCM mmap callback should handle this counter properly
1412 */
1413static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
1414{
1415 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1416 atomic_dec(v: &substream->mmap_count);
1417}
1418
1419int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
1420 struct vm_area_struct *area);
1421/* mmap for io-memory area */
1422#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
1423#define SNDRV_PCM_INFO_MMAP_IOMEM SNDRV_PCM_INFO_MMAP
1424int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
1425#else
1426#define SNDRV_PCM_INFO_MMAP_IOMEM 0
1427#define snd_pcm_lib_mmap_iomem NULL
1428#endif
1429
1430/**
1431 * snd_pcm_limit_isa_dma_size - Get the max size fitting with ISA DMA transfer
1432 * @dma: DMA number
1433 * @max: pointer to store the max size
1434 */
1435static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
1436{
1437 *max = dma < 4 ? 64 * 1024 : 128 * 1024;
1438}
1439
1440/*
1441 * Misc
1442 */
1443
1444#define SNDRV_PCM_DEFAULT_CON_SPDIF (IEC958_AES0_CON_EMPHASIS_NONE|\
1445 (IEC958_AES1_CON_ORIGINAL<<8)|\
1446 (IEC958_AES1_CON_PCM_CODER<<8)|\
1447 (IEC958_AES3_CON_FS_48000<<24))
1448
1449const char *snd_pcm_format_name(snd_pcm_format_t format);
1450
1451/**
1452 * snd_pcm_direction_name - Get a string naming the direction of a stream
1453 * @direction: Stream's direction, one of SNDRV_PCM_STREAM_XXX
1454 *
1455 * Returns a string naming the direction of the stream.
1456 */
1457static inline const char *snd_pcm_direction_name(int direction)
1458{
1459 if (direction == SNDRV_PCM_STREAM_PLAYBACK)
1460 return "Playback";
1461 else
1462 return "Capture";
1463}
1464
1465/**
1466 * snd_pcm_stream_str - Get a string naming the direction of a stream
1467 * @substream: the pcm substream instance
1468 *
1469 * Return: A string naming the direction of the stream.
1470 */
1471static inline const char *snd_pcm_stream_str(struct snd_pcm_substream *substream)
1472{
1473 return snd_pcm_direction_name(direction: substream->stream);
1474}
1475
1476/*
1477 * PCM channel-mapping control API
1478 */
1479/* array element of channel maps */
1480struct snd_pcm_chmap_elem {
1481 unsigned char channels;
1482 unsigned char map[15];
1483};
1484
1485/* channel map information; retrieved via snd_kcontrol_chip() */
1486struct snd_pcm_chmap {
1487 struct snd_pcm *pcm; /* assigned PCM instance */
1488 int stream; /* PLAYBACK or CAPTURE */
1489 struct snd_kcontrol *kctl;
1490 const struct snd_pcm_chmap_elem *chmap;
1491 unsigned int max_channels;
1492 unsigned int channel_mask; /* optional: active channels bitmask */
1493 void *private_data; /* optional: private data pointer */
1494};
1495
1496/**
1497 * snd_pcm_chmap_substream - get the PCM substream assigned to the given chmap info
1498 * @info: chmap information
1499 * @idx: the substream number index
1500 *
1501 * Return: the matched PCM substream, or NULL if not found
1502 */
1503static inline struct snd_pcm_substream *
1504snd_pcm_chmap_substream(struct snd_pcm_chmap *info, unsigned int idx)
1505{
1506 struct snd_pcm_substream *s;
1507 for (s = info->pcm->streams[info->stream].substream; s; s = s->next)
1508 if (s->number == idx)
1509 return s;
1510 return NULL;
1511}
1512
1513/* ALSA-standard channel maps (RL/RR prior to C/LFE) */
1514extern const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[];
1515/* Other world's standard channel maps (C/LFE prior to RL/RR) */
1516extern const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[];
1517
1518/* bit masks to be passed to snd_pcm_chmap.channel_mask field */
1519#define SND_PCM_CHMAP_MASK_24 ((1U << 2) | (1U << 4))
1520#define SND_PCM_CHMAP_MASK_246 (SND_PCM_CHMAP_MASK_24 | (1U << 6))
1521#define SND_PCM_CHMAP_MASK_2468 (SND_PCM_CHMAP_MASK_246 | (1U << 8))
1522
1523int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
1524 const struct snd_pcm_chmap_elem *chmap,
1525 int max_channels,
1526 unsigned long private_value,
1527 struct snd_pcm_chmap **info_ret);
1528
1529/**
1530 * pcm_format_to_bits - Strong-typed conversion of pcm_format to bitwise
1531 * @pcm_format: PCM format
1532 *
1533 * Return: 64bit mask corresponding to the given PCM format
1534 */
1535static inline u64 pcm_format_to_bits(snd_pcm_format_t pcm_format)
1536{
1537 return 1ULL << (__force int) pcm_format;
1538}
1539
1540/**
1541 * pcm_for_each_format - helper to iterate for each format type
1542 * @f: the iterator variable in snd_pcm_format_t type
1543 */
1544#define pcm_for_each_format(f) \
1545 for ((f) = SNDRV_PCM_FORMAT_FIRST; \
1546 (__force int)(f) <= (__force int)SNDRV_PCM_FORMAT_LAST; \
1547 (f) = (__force snd_pcm_format_t)((__force int)(f) + 1))
1548
1549/* printk helpers */
1550#define pcm_err(pcm, fmt, args...) \
1551 dev_err((pcm)->card->dev, fmt, ##args)
1552#define pcm_warn(pcm, fmt, args...) \
1553 dev_warn((pcm)->card->dev, fmt, ##args)
1554#define pcm_dbg(pcm, fmt, args...) \
1555 dev_dbg((pcm)->card->dev, fmt, ##args)
1556
1557/* helpers for copying between iov_iter and iomem */
1558int copy_to_iter_fromio(struct iov_iter *itert, const void __iomem *src,
1559 size_t count);
1560int copy_from_iter_toio(void __iomem *dst, struct iov_iter *iter, size_t count);
1561
1562struct snd_pcm_status64 {
1563 snd_pcm_state_t state; /* stream state */
1564 u8 rsvd[4];
1565 s64 trigger_tstamp_sec; /* time when stream was started/stopped/paused */
1566 s64 trigger_tstamp_nsec;
1567 s64 tstamp_sec; /* reference timestamp */
1568 s64 tstamp_nsec;
1569 snd_pcm_uframes_t appl_ptr; /* appl ptr */
1570 snd_pcm_uframes_t hw_ptr; /* hw ptr */
1571 snd_pcm_sframes_t delay; /* current delay in frames */
1572 snd_pcm_uframes_t avail; /* number of frames available */
1573 snd_pcm_uframes_t avail_max; /* max frames available on hw since last status */
1574 snd_pcm_uframes_t overrange; /* count of ADC (capture) overrange detections from last status */
1575 snd_pcm_state_t suspended_state; /* suspended stream state */
1576 __u32 audio_tstamp_data; /* needed for 64-bit alignment, used for configs/report to/from userspace */
1577 s64 audio_tstamp_sec; /* sample counter, wall clock, PHC or on-demand sync'ed */
1578 s64 audio_tstamp_nsec;
1579 s64 driver_tstamp_sec; /* useful in case reference system tstamp is reported with delay */
1580 s64 driver_tstamp_nsec;
1581 __u32 audio_tstamp_accuracy; /* in ns units, only valid if indicated in audio_tstamp_data */
1582 unsigned char reserved[52-4*sizeof(s64)]; /* must be filled with zero */
1583};
1584
1585#define SNDRV_PCM_IOCTL_STATUS64 _IOR('A', 0x20, struct snd_pcm_status64)
1586#define SNDRV_PCM_IOCTL_STATUS_EXT64 _IOWR('A', 0x24, struct snd_pcm_status64)
1587
1588struct snd_pcm_status32 {
1589 snd_pcm_state_t state; /* stream state */
1590 s32 trigger_tstamp_sec; /* time when stream was started/stopped/paused */
1591 s32 trigger_tstamp_nsec;
1592 s32 tstamp_sec; /* reference timestamp */
1593 s32 tstamp_nsec;
1594 u32 appl_ptr; /* appl ptr */
1595 u32 hw_ptr; /* hw ptr */
1596 s32 delay; /* current delay in frames */
1597 u32 avail; /* number of frames available */
1598 u32 avail_max; /* max frames available on hw since last status */
1599 u32 overrange; /* count of ADC (capture) overrange detections from last status */
1600 snd_pcm_state_t suspended_state; /* suspended stream state */
1601 u32 audio_tstamp_data; /* needed for 64-bit alignment, used for configs/report to/from userspace */
1602 s32 audio_tstamp_sec; /* sample counter, wall clock, PHC or on-demand sync'ed */
1603 s32 audio_tstamp_nsec;
1604 s32 driver_tstamp_sec; /* useful in case reference system tstamp is reported with delay */
1605 s32 driver_tstamp_nsec;
1606 u32 audio_tstamp_accuracy; /* in ns units, only valid if indicated in audio_tstamp_data */
1607 unsigned char reserved[52-4*sizeof(s32)]; /* must be filled with zero */
1608};
1609
1610#define SNDRV_PCM_IOCTL_STATUS32 _IOR('A', 0x20, struct snd_pcm_status32)
1611#define SNDRV_PCM_IOCTL_STATUS_EXT32 _IOWR('A', 0x24, struct snd_pcm_status32)
1612
1613#endif /* __SOUND_PCM_H */
1614

source code of linux/include/sound/pcm.h