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 u32 subformats; /* for S32_LE, SNDRV_PCM_SUBFMTBIT_* */
36 unsigned int rates; /* SNDRV_PCM_RATE_* */
37 unsigned int rate_min; /* min rate */
38 unsigned int rate_max; /* max rate */
39 unsigned int channels_min; /* min channels */
40 unsigned int channels_max; /* max channels */
41 size_t buffer_bytes_max; /* max buffer size */
42 size_t period_bytes_min; /* min period size */
43 size_t period_bytes_max; /* max period size */
44 unsigned int periods_min; /* min # of periods */
45 unsigned int periods_max; /* max # of periods */
46 size_t fifo_size; /* fifo size in bytes */
47};
48
49struct snd_pcm_status64;
50struct snd_pcm_substream;
51
52struct snd_pcm_audio_tstamp_config; /* definitions further down */
53struct snd_pcm_audio_tstamp_report;
54
55struct snd_pcm_ops {
56 int (*open)(struct snd_pcm_substream *substream);
57 int (*close)(struct snd_pcm_substream *substream);
58 int (*ioctl)(struct snd_pcm_substream * substream,
59 unsigned int cmd, void *arg);
60 int (*hw_params)(struct snd_pcm_substream *substream,
61 struct snd_pcm_hw_params *params);
62 int (*hw_free)(struct snd_pcm_substream *substream);
63 int (*prepare)(struct snd_pcm_substream *substream);
64 int (*trigger)(struct snd_pcm_substream *substream, int cmd);
65 int (*sync_stop)(struct snd_pcm_substream *substream);
66 snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *substream);
67 int (*get_time_info)(struct snd_pcm_substream *substream,
68 struct timespec64 *system_ts, struct timespec64 *audio_ts,
69 struct snd_pcm_audio_tstamp_config *audio_tstamp_config,
70 struct snd_pcm_audio_tstamp_report *audio_tstamp_report);
71 int (*fill_silence)(struct snd_pcm_substream *substream, int channel,
72 unsigned long pos, unsigned long bytes);
73 int (*copy)(struct snd_pcm_substream *substream, int channel,
74 unsigned long pos, struct iov_iter *iter, unsigned long bytes);
75 struct page *(*page)(struct snd_pcm_substream *substream,
76 unsigned long offset);
77 int (*mmap)(struct snd_pcm_substream *substream, struct vm_area_struct *vma);
78 int (*ack)(struct snd_pcm_substream *substream);
79};
80
81/*
82 *
83 */
84
85#if defined(CONFIG_SND_DYNAMIC_MINORS)
86#define SNDRV_PCM_DEVICES (SNDRV_OS_MINORS-2)
87#else
88#define SNDRV_PCM_DEVICES 8
89#endif
90
91#define SNDRV_PCM_IOCTL1_RESET 0
92/* 1 is absent slot. */
93#define SNDRV_PCM_IOCTL1_CHANNEL_INFO 2
94/* 3 is absent slot. */
95#define SNDRV_PCM_IOCTL1_FIFO_SIZE 4
96#define SNDRV_PCM_IOCTL1_SYNC_ID 5
97
98#define SNDRV_PCM_TRIGGER_STOP 0
99#define SNDRV_PCM_TRIGGER_START 1
100#define SNDRV_PCM_TRIGGER_PAUSE_PUSH 2
101#define SNDRV_PCM_TRIGGER_PAUSE_RELEASE 3
102#define SNDRV_PCM_TRIGGER_SUSPEND 4
103#define SNDRV_PCM_TRIGGER_RESUME 5
104#define SNDRV_PCM_TRIGGER_DRAIN 6
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 (1U<<0) /* 5512Hz */
110#define SNDRV_PCM_RATE_8000 (1U<<1) /* 8000Hz */
111#define SNDRV_PCM_RATE_11025 (1U<<2) /* 11025Hz */
112#define SNDRV_PCM_RATE_16000 (1U<<3) /* 16000Hz */
113#define SNDRV_PCM_RATE_22050 (1U<<4) /* 22050Hz */
114#define SNDRV_PCM_RATE_32000 (1U<<5) /* 32000Hz */
115#define SNDRV_PCM_RATE_44100 (1U<<6) /* 44100Hz */
116#define SNDRV_PCM_RATE_48000 (1U<<7) /* 48000Hz */
117#define SNDRV_PCM_RATE_64000 (1U<<8) /* 64000Hz */
118#define SNDRV_PCM_RATE_88200 (1U<<9) /* 88200Hz */
119#define SNDRV_PCM_RATE_96000 (1U<<10) /* 96000Hz */
120#define SNDRV_PCM_RATE_176400 (1U<<11) /* 176400Hz */
121#define SNDRV_PCM_RATE_192000 (1U<<12) /* 192000Hz */
122#define SNDRV_PCM_RATE_352800 (1U<<13) /* 352800Hz */
123#define SNDRV_PCM_RATE_384000 (1U<<14) /* 384000Hz */
124#define SNDRV_PCM_RATE_705600 (1U<<15) /* 705600Hz */
125#define SNDRV_PCM_RATE_768000 (1U<<16) /* 768000Hz */
126/* extended rates since 6.12 */
127#define SNDRV_PCM_RATE_12000 (1U<<17) /* 12000Hz */
128#define SNDRV_PCM_RATE_24000 (1U<<18) /* 24000Hz */
129#define SNDRV_PCM_RATE_128000 (1U<<19) /* 128000Hz */
130
131#define SNDRV_PCM_RATE_CONTINUOUS (1U<<30) /* continuous range */
132#define SNDRV_PCM_RATE_KNOT (1U<<31) /* supports more non-continuous rates */
133
134#define SNDRV_PCM_RATE_8000_44100 (SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_11025|\
135 SNDRV_PCM_RATE_16000|SNDRV_PCM_RATE_22050|\
136 SNDRV_PCM_RATE_32000|SNDRV_PCM_RATE_44100)
137#define SNDRV_PCM_RATE_8000_48000 (SNDRV_PCM_RATE_8000_44100|SNDRV_PCM_RATE_48000)
138#define SNDRV_PCM_RATE_8000_96000 (SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_64000|\
139 SNDRV_PCM_RATE_88200|SNDRV_PCM_RATE_96000)
140#define SNDRV_PCM_RATE_8000_192000 (SNDRV_PCM_RATE_8000_96000|SNDRV_PCM_RATE_176400|\
141 SNDRV_PCM_RATE_192000)
142#define SNDRV_PCM_RATE_8000_384000 (SNDRV_PCM_RATE_8000_192000|\
143 SNDRV_PCM_RATE_352800|\
144 SNDRV_PCM_RATE_384000)
145#define SNDRV_PCM_RATE_8000_768000 (SNDRV_PCM_RATE_8000_384000|\
146 SNDRV_PCM_RATE_705600|\
147 SNDRV_PCM_RATE_768000)
148#define _SNDRV_PCM_FMTBIT(fmt) (1ULL << (__force int)SNDRV_PCM_FORMAT_##fmt)
149#define SNDRV_PCM_FMTBIT_S8 _SNDRV_PCM_FMTBIT(S8)
150#define SNDRV_PCM_FMTBIT_U8 _SNDRV_PCM_FMTBIT(U8)
151#define SNDRV_PCM_FMTBIT_S16_LE _SNDRV_PCM_FMTBIT(S16_LE)
152#define SNDRV_PCM_FMTBIT_S16_BE _SNDRV_PCM_FMTBIT(S16_BE)
153#define SNDRV_PCM_FMTBIT_U16_LE _SNDRV_PCM_FMTBIT(U16_LE)
154#define SNDRV_PCM_FMTBIT_U16_BE _SNDRV_PCM_FMTBIT(U16_BE)
155#define SNDRV_PCM_FMTBIT_S24_LE _SNDRV_PCM_FMTBIT(S24_LE)
156#define SNDRV_PCM_FMTBIT_S24_BE _SNDRV_PCM_FMTBIT(S24_BE)
157#define SNDRV_PCM_FMTBIT_U24_LE _SNDRV_PCM_FMTBIT(U24_LE)
158#define SNDRV_PCM_FMTBIT_U24_BE _SNDRV_PCM_FMTBIT(U24_BE)
159// For S32/U32 formats, 'msbits' hardware parameter is often used to deliver information about the
160// available bit count in most significant bit. It's for the case of so-called 'left-justified' or
161// `right-padding` sample which has less width than 32 bit.
162#define SNDRV_PCM_FMTBIT_S32_LE _SNDRV_PCM_FMTBIT(S32_LE)
163#define SNDRV_PCM_FMTBIT_S32_BE _SNDRV_PCM_FMTBIT(S32_BE)
164#define SNDRV_PCM_FMTBIT_U32_LE _SNDRV_PCM_FMTBIT(U32_LE)
165#define SNDRV_PCM_FMTBIT_U32_BE _SNDRV_PCM_FMTBIT(U32_BE)
166#define SNDRV_PCM_FMTBIT_FLOAT_LE _SNDRV_PCM_FMTBIT(FLOAT_LE)
167#define SNDRV_PCM_FMTBIT_FLOAT_BE _SNDRV_PCM_FMTBIT(FLOAT_BE)
168#define SNDRV_PCM_FMTBIT_FLOAT64_LE _SNDRV_PCM_FMTBIT(FLOAT64_LE)
169#define SNDRV_PCM_FMTBIT_FLOAT64_BE _SNDRV_PCM_FMTBIT(FLOAT64_BE)
170#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_LE)
171#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_BE)
172#define SNDRV_PCM_FMTBIT_MU_LAW _SNDRV_PCM_FMTBIT(MU_LAW)
173#define SNDRV_PCM_FMTBIT_A_LAW _SNDRV_PCM_FMTBIT(A_LAW)
174#define SNDRV_PCM_FMTBIT_IMA_ADPCM _SNDRV_PCM_FMTBIT(IMA_ADPCM)
175#define SNDRV_PCM_FMTBIT_MPEG _SNDRV_PCM_FMTBIT(MPEG)
176#define SNDRV_PCM_FMTBIT_GSM _SNDRV_PCM_FMTBIT(GSM)
177#define SNDRV_PCM_FMTBIT_S20_LE _SNDRV_PCM_FMTBIT(S20_LE)
178#define SNDRV_PCM_FMTBIT_U20_LE _SNDRV_PCM_FMTBIT(U20_LE)
179#define SNDRV_PCM_FMTBIT_S20_BE _SNDRV_PCM_FMTBIT(S20_BE)
180#define SNDRV_PCM_FMTBIT_U20_BE _SNDRV_PCM_FMTBIT(U20_BE)
181#define SNDRV_PCM_FMTBIT_SPECIAL _SNDRV_PCM_FMTBIT(SPECIAL)
182#define SNDRV_PCM_FMTBIT_S24_3LE _SNDRV_PCM_FMTBIT(S24_3LE)
183#define SNDRV_PCM_FMTBIT_U24_3LE _SNDRV_PCM_FMTBIT(U24_3LE)
184#define SNDRV_PCM_FMTBIT_S24_3BE _SNDRV_PCM_FMTBIT(S24_3BE)
185#define SNDRV_PCM_FMTBIT_U24_3BE _SNDRV_PCM_FMTBIT(U24_3BE)
186#define SNDRV_PCM_FMTBIT_S20_3LE _SNDRV_PCM_FMTBIT(S20_3LE)
187#define SNDRV_PCM_FMTBIT_U20_3LE _SNDRV_PCM_FMTBIT(U20_3LE)
188#define SNDRV_PCM_FMTBIT_S20_3BE _SNDRV_PCM_FMTBIT(S20_3BE)
189#define SNDRV_PCM_FMTBIT_U20_3BE _SNDRV_PCM_FMTBIT(U20_3BE)
190#define SNDRV_PCM_FMTBIT_S18_3LE _SNDRV_PCM_FMTBIT(S18_3LE)
191#define SNDRV_PCM_FMTBIT_U18_3LE _SNDRV_PCM_FMTBIT(U18_3LE)
192#define SNDRV_PCM_FMTBIT_S18_3BE _SNDRV_PCM_FMTBIT(S18_3BE)
193#define SNDRV_PCM_FMTBIT_U18_3BE _SNDRV_PCM_FMTBIT(U18_3BE)
194#define SNDRV_PCM_FMTBIT_G723_24 _SNDRV_PCM_FMTBIT(G723_24)
195#define SNDRV_PCM_FMTBIT_G723_24_1B _SNDRV_PCM_FMTBIT(G723_24_1B)
196#define SNDRV_PCM_FMTBIT_G723_40 _SNDRV_PCM_FMTBIT(G723_40)
197#define SNDRV_PCM_FMTBIT_G723_40_1B _SNDRV_PCM_FMTBIT(G723_40_1B)
198#define SNDRV_PCM_FMTBIT_DSD_U8 _SNDRV_PCM_FMTBIT(DSD_U8)
199#define SNDRV_PCM_FMTBIT_DSD_U16_LE _SNDRV_PCM_FMTBIT(DSD_U16_LE)
200#define SNDRV_PCM_FMTBIT_DSD_U32_LE _SNDRV_PCM_FMTBIT(DSD_U32_LE)
201#define SNDRV_PCM_FMTBIT_DSD_U16_BE _SNDRV_PCM_FMTBIT(DSD_U16_BE)
202#define SNDRV_PCM_FMTBIT_DSD_U32_BE _SNDRV_PCM_FMTBIT(DSD_U32_BE)
203
204#ifdef SNDRV_LITTLE_ENDIAN
205#define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_LE
206#define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_LE
207#define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_LE
208#define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_LE
209#define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_LE
210#define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_LE
211#define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_LE
212#define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_LE
213#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE
214#define SNDRV_PCM_FMTBIT_S20 SNDRV_PCM_FMTBIT_S20_LE
215#define SNDRV_PCM_FMTBIT_U20 SNDRV_PCM_FMTBIT_U20_LE
216#endif
217#ifdef SNDRV_BIG_ENDIAN
218#define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_BE
219#define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_BE
220#define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_BE
221#define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_BE
222#define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_BE
223#define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_BE
224#define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_BE
225#define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_BE
226#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE
227#define SNDRV_PCM_FMTBIT_S20 SNDRV_PCM_FMTBIT_S20_BE
228#define SNDRV_PCM_FMTBIT_U20 SNDRV_PCM_FMTBIT_U20_BE
229#endif
230
231#define _SNDRV_PCM_SUBFMTBIT(fmt) BIT((__force int)SNDRV_PCM_SUBFORMAT_##fmt)
232#define SNDRV_PCM_SUBFMTBIT_STD _SNDRV_PCM_SUBFMTBIT(STD)
233#define SNDRV_PCM_SUBFMTBIT_MSBITS_MAX _SNDRV_PCM_SUBFMTBIT(MSBITS_MAX)
234#define SNDRV_PCM_SUBFMTBIT_MSBITS_20 _SNDRV_PCM_SUBFMTBIT(MSBITS_20)
235#define SNDRV_PCM_SUBFMTBIT_MSBITS_24 _SNDRV_PCM_SUBFMTBIT(MSBITS_24)
236
237struct snd_pcm_file {
238 struct snd_pcm_substream *substream;
239 int no_compat_mmap;
240 unsigned int user_pversion; /* supported protocol version */
241};
242
243struct snd_pcm_hw_rule;
244typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params,
245 struct snd_pcm_hw_rule *rule);
246
247struct snd_pcm_hw_rule {
248 unsigned int cond;
249 int var;
250 int deps[5];
251
252 snd_pcm_hw_rule_func_t func;
253 void *private;
254};
255
256struct snd_pcm_hw_constraints {
257 struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK -
258 SNDRV_PCM_HW_PARAM_FIRST_MASK + 1];
259 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL -
260 SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
261 unsigned int rules_num;
262 unsigned int rules_all;
263 struct snd_pcm_hw_rule *rules;
264};
265
266static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs,
267 snd_pcm_hw_param_t var)
268{
269 return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
270}
271
272static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs,
273 snd_pcm_hw_param_t var)
274{
275 return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
276}
277
278struct snd_ratnum {
279 unsigned int num;
280 unsigned int den_min, den_max, den_step;
281};
282
283struct snd_ratden {
284 unsigned int num_min, num_max, num_step;
285 unsigned int den;
286};
287
288struct snd_pcm_hw_constraint_ratnums {
289 int nrats;
290 const struct snd_ratnum *rats;
291};
292
293struct snd_pcm_hw_constraint_ratdens {
294 int nrats;
295 const struct snd_ratden *rats;
296};
297
298struct snd_pcm_hw_constraint_list {
299 const unsigned int *list;
300 unsigned int count;
301 unsigned int mask;
302};
303
304struct snd_pcm_hw_constraint_ranges {
305 unsigned int count;
306 const struct snd_interval *ranges;
307 unsigned int mask;
308};
309
310/*
311 * userspace-provided audio timestamp config to kernel,
312 * structure is for internal use only and filled with dedicated unpack routine
313 */
314struct snd_pcm_audio_tstamp_config {
315 /* 5 of max 16 bits used */
316 u32 type_requested:4;
317 u32 report_delay:1; /* add total delay to A/D or D/A */
318};
319
320static inline void snd_pcm_unpack_audio_tstamp_config(__u32 data,
321 struct snd_pcm_audio_tstamp_config *config)
322{
323 config->type_requested = data & 0xF;
324 config->report_delay = (data >> 4) & 1;
325}
326
327/*
328 * kernel-provided audio timestamp report to user-space
329 * structure is for internal use only and read by dedicated pack routine
330 */
331struct snd_pcm_audio_tstamp_report {
332 /* 6 of max 16 bits used for bit-fields */
333
334 /* for backwards compatibility */
335 u32 valid:1;
336
337 /* actual type if hardware could not support requested timestamp */
338 u32 actual_type:4;
339
340 /* accuracy represented in ns units */
341 u32 accuracy_report:1; /* 0 if accuracy unknown, 1 if accuracy field is valid */
342 u32 accuracy; /* up to 4.29s, will be packed in separate field */
343};
344
345static inline void snd_pcm_pack_audio_tstamp_report(__u32 *data, __u32 *accuracy,
346 const struct snd_pcm_audio_tstamp_report *report)
347{
348 u32 tmp;
349
350 tmp = report->accuracy_report;
351 tmp <<= 4;
352 tmp |= report->actual_type;
353 tmp <<= 1;
354 tmp |= report->valid;
355
356 *data &= 0xffff; /* zero-clear MSBs */
357 *data |= (tmp << 16);
358 *accuracy = report->accuracy;
359}
360
361
362struct snd_pcm_runtime {
363 /* -- Status -- */
364 snd_pcm_state_t state; /* stream state */
365 snd_pcm_state_t suspended_state; /* suspended stream state */
366 struct snd_pcm_substream *trigger_master;
367 struct timespec64 trigger_tstamp; /* trigger timestamp */
368 bool trigger_tstamp_latched; /* trigger timestamp latched in low-level driver/hardware */
369 int overrange;
370 snd_pcm_uframes_t avail_max;
371 snd_pcm_uframes_t hw_ptr_base; /* Position at buffer restart */
372 snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time */
373 unsigned long hw_ptr_jiffies; /* Time when hw_ptr is updated */
374 unsigned long hw_ptr_buffer_jiffies; /* buffer time in jiffies */
375 snd_pcm_sframes_t delay; /* extra delay; typically FIFO size */
376 u64 hw_ptr_wrap; /* offset for hw_ptr due to boundary wrap-around */
377
378 /* -- HW params -- */
379 snd_pcm_access_t access; /* access mode */
380 snd_pcm_format_t format; /* SNDRV_PCM_FORMAT_* */
381 snd_pcm_subformat_t subformat; /* subformat */
382 unsigned int rate; /* rate in Hz */
383 unsigned int channels; /* channels */
384 snd_pcm_uframes_t period_size; /* period size */
385 unsigned int periods; /* periods */
386 snd_pcm_uframes_t buffer_size; /* buffer size */
387 snd_pcm_uframes_t min_align; /* Min alignment for the format */
388 size_t byte_align;
389 unsigned int frame_bits;
390 unsigned int sample_bits;
391 unsigned int info;
392 unsigned int rate_num;
393 unsigned int rate_den;
394 unsigned int no_period_wakeup: 1;
395
396 /* -- SW params; see struct snd_pcm_sw_params for comments -- */
397 int tstamp_mode;
398 unsigned int period_step;
399 snd_pcm_uframes_t start_threshold;
400 snd_pcm_uframes_t stop_threshold;
401 snd_pcm_uframes_t silence_threshold;
402 snd_pcm_uframes_t silence_size;
403 snd_pcm_uframes_t boundary;
404
405 /* internal data of auto-silencer */
406 snd_pcm_uframes_t silence_start; /* starting pointer to silence area */
407 snd_pcm_uframes_t silence_filled; /* already filled part of silence area */
408
409 bool std_sync_id; /* hardware synchronization - standard per card ID */
410
411 /* -- mmap -- */
412 struct snd_pcm_mmap_status *status;
413 struct snd_pcm_mmap_control *control;
414
415 /* -- locking / scheduling -- */
416 snd_pcm_uframes_t twake; /* do transfer (!poll) wakeup if non-zero */
417 wait_queue_head_t sleep; /* poll sleep */
418 wait_queue_head_t tsleep; /* transfer sleep */
419 struct snd_fasync *fasync;
420 bool stop_operating; /* sync_stop will be called */
421 struct mutex buffer_mutex; /* protect for buffer changes */
422 atomic_t buffer_accessing; /* >0: in r/w operation, <0: blocked */
423
424 /* -- private section -- */
425 void *private_data;
426 void (*private_free)(struct snd_pcm_runtime *runtime);
427
428 /* -- hardware description -- */
429 struct snd_pcm_hardware hw;
430 struct snd_pcm_hw_constraints hw_constraints;
431
432 /* -- timer -- */
433 unsigned int timer_resolution; /* timer resolution */
434 int tstamp_type; /* timestamp type */
435
436 /* -- DMA -- */
437 unsigned char *dma_area; /* DMA area */
438 dma_addr_t dma_addr; /* physical bus address (not accessible from main CPU) */
439 size_t dma_bytes; /* size of DMA area */
440
441 struct snd_dma_buffer *dma_buffer_p; /* allocated buffer */
442 unsigned int buffer_changed:1; /* buffer allocation changed; set only in managed mode */
443
444 /* -- audio timestamp config -- */
445 struct snd_pcm_audio_tstamp_config audio_tstamp_config;
446 struct snd_pcm_audio_tstamp_report audio_tstamp_report;
447 struct timespec64 driver_tstamp;
448
449#if IS_ENABLED(CONFIG_SND_PCM_OSS)
450 /* -- OSS things -- */
451 struct snd_pcm_oss_runtime oss;
452#endif
453};
454
455struct snd_pcm_group { /* keep linked substreams */
456 spinlock_t lock;
457 struct mutex mutex;
458 struct list_head substreams;
459 refcount_t refs;
460};
461
462struct pid;
463
464struct snd_pcm_substream {
465 struct snd_pcm *pcm;
466 struct snd_pcm_str *pstr;
467 void *private_data; /* copied from pcm->private_data */
468 int number;
469 char name[32]; /* substream name */
470 int stream; /* stream (direction) */
471 struct pm_qos_request latency_pm_qos_req; /* pm_qos request */
472 size_t buffer_bytes_max; /* limit ring buffer size */
473 struct snd_dma_buffer dma_buffer;
474 size_t dma_max;
475 /* -- hardware operations -- */
476 const struct snd_pcm_ops *ops;
477 /* -- runtime information -- */
478 struct snd_pcm_runtime *runtime;
479 /* -- timer section -- */
480 struct snd_timer *timer; /* timer */
481 unsigned timer_running: 1; /* time is running */
482 long wait_time; /* time in ms for R/W to wait for avail */
483 /* -- next substream -- */
484 struct snd_pcm_substream *next;
485 /* -- linked substreams -- */
486 struct list_head link_list; /* linked list member */
487 struct snd_pcm_group self_group; /* fake group for non linked substream (with substream lock inside) */
488 struct snd_pcm_group *group; /* pointer to current group */
489 /* -- assigned files -- */
490 int ref_count;
491 atomic_t mmap_count;
492 unsigned int f_flags;
493 void (*pcm_release)(struct snd_pcm_substream *);
494 struct pid *pid;
495#if IS_ENABLED(CONFIG_SND_PCM_OSS)
496 /* -- OSS things -- */
497 struct snd_pcm_oss_substream oss;
498#endif
499#ifdef CONFIG_SND_VERBOSE_PROCFS
500 struct snd_info_entry *proc_root;
501#endif /* CONFIG_SND_VERBOSE_PROCFS */
502 /* misc flags */
503 unsigned int hw_opened: 1;
504 unsigned int managed_buffer_alloc:1;
505#ifdef CONFIG_SND_PCM_XRUN_DEBUG
506 unsigned int xrun_counter; /* number of times xrun happens */
507#endif /* CONFIG_SND_PCM_XRUN_DEBUG */
508};
509
510#define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0)
511
512
513struct snd_pcm_str {
514 int stream; /* stream (direction) */
515 struct snd_pcm *pcm;
516 /* -- substreams -- */
517 unsigned int substream_count;
518 unsigned int substream_opened;
519 struct snd_pcm_substream *substream;
520#if IS_ENABLED(CONFIG_SND_PCM_OSS)
521 /* -- OSS things -- */
522 struct snd_pcm_oss_stream oss;
523#endif
524#ifdef CONFIG_SND_VERBOSE_PROCFS
525 struct snd_info_entry *proc_root;
526#ifdef CONFIG_SND_PCM_XRUN_DEBUG
527 unsigned int xrun_debug; /* 0 = disabled, 1 = verbose, 2 = stacktrace */
528#endif
529#endif
530 struct snd_kcontrol *chmap_kctl; /* channel-mapping controls */
531 struct device *dev;
532};
533
534struct snd_pcm {
535 struct snd_card *card;
536 struct list_head list;
537 int device; /* device number */
538 unsigned int info_flags;
539 unsigned short dev_class;
540 unsigned short dev_subclass;
541 char id[64];
542 char name[80];
543 struct snd_pcm_str streams[2];
544 struct mutex open_mutex;
545 wait_queue_head_t open_wait;
546 void *private_data;
547 void (*private_free) (struct snd_pcm *pcm);
548 bool internal; /* pcm is for internal use only */
549 bool nonatomic; /* whole PCM operations are in non-atomic context */
550 bool no_device_suspend; /* don't invoke device PM suspend */
551#if IS_ENABLED(CONFIG_SND_PCM_OSS)
552 struct snd_pcm_oss oss;
553#endif
554};
555
556/*
557 * Registering
558 */
559
560extern const struct file_operations snd_pcm_f_ops[2];
561
562int snd_pcm_new(struct snd_card *card, const char *id, int device,
563 int playback_count, int capture_count,
564 struct snd_pcm **rpcm);
565int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
566 int playback_count, int capture_count,
567 struct snd_pcm **rpcm);
568int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
569
570#if IS_ENABLED(CONFIG_SND_PCM_OSS)
571struct snd_pcm_notify {
572 int (*n_register) (struct snd_pcm * pcm);
573 int (*n_disconnect) (struct snd_pcm * pcm);
574 int (*n_unregister) (struct snd_pcm * pcm);
575 struct list_head list;
576};
577int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
578#endif
579
580/*
581 * Native I/O
582 */
583
584int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
585int snd_pcm_info_user(struct snd_pcm_substream *substream,
586 struct snd_pcm_info __user *info);
587int snd_pcm_status64(struct snd_pcm_substream *substream,
588 struct snd_pcm_status64 *status);
589int snd_pcm_start(struct snd_pcm_substream *substream);
590int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t status);
591int snd_pcm_drain_done(struct snd_pcm_substream *substream);
592int snd_pcm_stop_xrun(struct snd_pcm_substream *substream);
593#ifdef CONFIG_PM
594int snd_pcm_suspend_all(struct snd_pcm *pcm);
595#else
596static inline int snd_pcm_suspend_all(struct snd_pcm *pcm)
597{
598 return 0;
599}
600#endif
601int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
602int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
603 struct snd_pcm_substream **rsubstream);
604void snd_pcm_release_substream(struct snd_pcm_substream *substream);
605int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
606 struct snd_pcm_substream **rsubstream);
607void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
608int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
609
610
611#ifdef CONFIG_SND_DEBUG
612void snd_pcm_debug_name(struct snd_pcm_substream *substream,
613 char *name, size_t len);
614#else
615static inline void
616snd_pcm_debug_name(struct snd_pcm_substream *substream, char *buf, size_t size)
617{
618 *buf = 0;
619}
620#endif
621
622/*
623 * PCM library
624 */
625
626/**
627 * snd_pcm_stream_linked - Check whether the substream is linked with others
628 * @substream: substream to check
629 *
630 * Return: true if the given substream is being linked with others
631 */
632static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
633{
634 return substream->group != &substream->self_group;
635}
636
637void snd_pcm_stream_lock(struct snd_pcm_substream *substream);
638void snd_pcm_stream_unlock(struct snd_pcm_substream *substream);
639void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream);
640void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream);
641unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream);
642unsigned long _snd_pcm_stream_lock_irqsave_nested(struct snd_pcm_substream *substream);
643
644/**
645 * snd_pcm_stream_lock_irqsave - Lock the PCM stream
646 * @substream: PCM substream
647 * @flags: irq flags
648 *
649 * This locks the PCM stream like snd_pcm_stream_lock() but with the local
650 * IRQ (only when nonatomic is false). In nonatomic case, this is identical
651 * as snd_pcm_stream_lock().
652 */
653#define snd_pcm_stream_lock_irqsave(substream, flags) \
654 do { \
655 typecheck(unsigned long, flags); \
656 flags = _snd_pcm_stream_lock_irqsave(substream); \
657 } while (0)
658void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
659 unsigned long flags);
660
661/**
662 * snd_pcm_stream_lock_irqsave_nested - Single-nested PCM stream locking
663 * @substream: PCM substream
664 * @flags: irq flags
665 *
666 * This locks the PCM stream like snd_pcm_stream_lock_irqsave() but with
667 * the single-depth lockdep subclass.
668 */
669#define snd_pcm_stream_lock_irqsave_nested(substream, flags) \
670 do { \
671 typecheck(unsigned long, flags); \
672 flags = _snd_pcm_stream_lock_irqsave_nested(substream); \
673 } while (0)
674
675/* definitions for guard(); use like guard(pcm_stream_lock) */
676DEFINE_LOCK_GUARD_1(pcm_stream_lock, struct snd_pcm_substream,
677 snd_pcm_stream_lock(_T->lock),
678 snd_pcm_stream_unlock(_T->lock))
679DEFINE_LOCK_GUARD_1(pcm_stream_lock_irq, struct snd_pcm_substream,
680 snd_pcm_stream_lock_irq(_T->lock),
681 snd_pcm_stream_unlock_irq(_T->lock))
682DEFINE_LOCK_GUARD_1(pcm_stream_lock_irqsave, struct snd_pcm_substream,
683 snd_pcm_stream_lock_irqsave(_T->lock, _T->flags),
684 snd_pcm_stream_unlock_irqrestore(_T->lock, _T->flags),
685 unsigned long flags)
686
687/**
688 * snd_pcm_group_for_each_entry - iterate over the linked substreams
689 * @s: the iterator
690 * @substream: the substream
691 *
692 * Iterate over the all linked substreams to the given @substream.
693 * When @substream isn't linked with any others, this gives returns @substream
694 * itself once.
695 */
696#define snd_pcm_group_for_each_entry(s, substream) \
697 list_for_each_entry(s, &substream->group->substreams, link_list)
698
699#define for_each_pcm_streams(stream) \
700 for (stream = SNDRV_PCM_STREAM_PLAYBACK; \
701 stream <= SNDRV_PCM_STREAM_LAST; \
702 stream++)
703
704/**
705 * snd_pcm_running - Check whether the substream is in a running state
706 * @substream: substream to check
707 *
708 * Return: true if the given substream is in the state RUNNING, or in the
709 * state DRAINING for playback.
710 */
711static inline int snd_pcm_running(struct snd_pcm_substream *substream)
712{
713 return (substream->runtime->state == SNDRV_PCM_STATE_RUNNING ||
714 (substream->runtime->state == SNDRV_PCM_STATE_DRAINING &&
715 substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
716}
717
718/**
719 * __snd_pcm_set_state - Change the current PCM state
720 * @runtime: PCM runtime to set
721 * @state: the current state to set
722 *
723 * Call within the stream lock
724 */
725static inline void __snd_pcm_set_state(struct snd_pcm_runtime *runtime,
726 snd_pcm_state_t state)
727{
728 runtime->state = state;
729 runtime->status->state = state; /* copy for mmap */
730}
731
732/**
733 * bytes_to_samples - Unit conversion of the size from bytes to samples
734 * @runtime: PCM runtime instance
735 * @size: size in bytes
736 *
737 * Return: the size in samples
738 */
739static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
740{
741 return size * 8 / runtime->sample_bits;
742}
743
744/**
745 * bytes_to_frames - Unit conversion of the size from bytes to frames
746 * @runtime: PCM runtime instance
747 * @size: size in bytes
748 *
749 * Return: the size in frames
750 */
751static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
752{
753 return size * 8 / runtime->frame_bits;
754}
755
756/**
757 * samples_to_bytes - Unit conversion of the size from samples to bytes
758 * @runtime: PCM runtime instance
759 * @size: size in samples
760 *
761 * Return: the byte size
762 */
763static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
764{
765 return size * runtime->sample_bits / 8;
766}
767
768/**
769 * frames_to_bytes - Unit conversion of the size from frames to bytes
770 * @runtime: PCM runtime instance
771 * @size: size in frames
772 *
773 * Return: the byte size
774 */
775static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
776{
777 return size * runtime->frame_bits / 8;
778}
779
780/**
781 * frame_aligned - Check whether the byte size is aligned to frames
782 * @runtime: PCM runtime instance
783 * @bytes: size in bytes
784 *
785 * Return: true if aligned, or false if not
786 */
787static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
788{
789 return bytes % runtime->byte_align == 0;
790}
791
792/**
793 * snd_pcm_lib_buffer_bytes - Get the buffer size of the current PCM in bytes
794 * @substream: PCM substream
795 *
796 * Return: buffer byte size
797 */
798static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
799{
800 struct snd_pcm_runtime *runtime = substream->runtime;
801 return frames_to_bytes(runtime, size: runtime->buffer_size);
802}
803
804/**
805 * snd_pcm_lib_period_bytes - Get the period size of the current PCM in bytes
806 * @substream: PCM substream
807 *
808 * Return: period byte size
809 */
810static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
811{
812 struct snd_pcm_runtime *runtime = substream->runtime;
813 return frames_to_bytes(runtime, size: runtime->period_size);
814}
815
816/**
817 * snd_pcm_playback_avail - Get the available (writable) space for playback
818 * @runtime: PCM runtime instance
819 *
820 * Result is between 0 ... (boundary - 1)
821 *
822 * Return: available frame size
823 */
824static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
825{
826 snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
827 if (avail < 0)
828 avail += runtime->boundary;
829 else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
830 avail -= runtime->boundary;
831 return avail;
832}
833
834/**
835 * snd_pcm_capture_avail - Get the available (readable) space for capture
836 * @runtime: PCM runtime instance
837 *
838 * Result is between 0 ... (boundary - 1)
839 *
840 * Return: available frame size
841 */
842static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
843{
844 snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
845 if (avail < 0)
846 avail += runtime->boundary;
847 return avail;
848}
849
850/**
851 * snd_pcm_playback_hw_avail - Get the queued space for playback
852 * @runtime: PCM runtime instance
853 *
854 * Return: available frame size
855 */
856static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
857{
858 return runtime->buffer_size - snd_pcm_playback_avail(runtime);
859}
860
861/**
862 * snd_pcm_capture_hw_avail - Get the free space for capture
863 * @runtime: PCM runtime instance
864 *
865 * Return: available frame size
866 */
867static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
868{
869 return runtime->buffer_size - snd_pcm_capture_avail(runtime);
870}
871
872/**
873 * snd_pcm_playback_ready - check whether the playback buffer is available
874 * @substream: the pcm substream instance
875 *
876 * Checks whether enough free space is available on the playback buffer.
877 *
878 * Return: Non-zero if available, or zero if not.
879 */
880static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
881{
882 struct snd_pcm_runtime *runtime = substream->runtime;
883 return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
884}
885
886/**
887 * snd_pcm_capture_ready - check whether the capture buffer is available
888 * @substream: the pcm substream instance
889 *
890 * Checks whether enough capture data is available on the capture buffer.
891 *
892 * Return: Non-zero if available, or zero if not.
893 */
894static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
895{
896 struct snd_pcm_runtime *runtime = substream->runtime;
897 return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
898}
899
900/**
901 * snd_pcm_playback_data - check whether any data exists on the playback buffer
902 * @substream: the pcm substream instance
903 *
904 * Checks whether any data exists on the playback buffer.
905 *
906 * Return: Non-zero if any data exists, or zero if not. If stop_threshold
907 * is bigger or equal to boundary, then this function returns always non-zero.
908 */
909static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
910{
911 struct snd_pcm_runtime *runtime = substream->runtime;
912
913 if (runtime->stop_threshold >= runtime->boundary)
914 return 1;
915 return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
916}
917
918/**
919 * snd_pcm_playback_empty - check whether the playback buffer is empty
920 * @substream: the pcm substream instance
921 *
922 * Checks whether the playback buffer is empty.
923 *
924 * Return: Non-zero if empty, or zero if not.
925 */
926static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
927{
928 struct snd_pcm_runtime *runtime = substream->runtime;
929 return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
930}
931
932/**
933 * snd_pcm_capture_empty - check whether the capture buffer is empty
934 * @substream: the pcm substream instance
935 *
936 * Checks whether the capture buffer is empty.
937 *
938 * Return: Non-zero if empty, or zero if not.
939 */
940static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
941{
942 struct snd_pcm_runtime *runtime = substream->runtime;
943 return snd_pcm_capture_avail(runtime) == 0;
944}
945
946/**
947 * snd_pcm_trigger_done - Mark the master substream
948 * @substream: the pcm substream instance
949 * @master: the linked master substream
950 *
951 * When multiple substreams of the same card are linked and the hardware
952 * supports the single-shot operation, the driver calls this in the loop
953 * in snd_pcm_group_for_each_entry() for marking the substream as "done".
954 * Then most of trigger operations are performed only to the given master
955 * substream.
956 *
957 * The trigger_master mark is cleared at timestamp updates at the end
958 * of trigger operations.
959 */
960static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream,
961 struct snd_pcm_substream *master)
962{
963 substream->runtime->trigger_master = master;
964}
965
966static inline int hw_is_mask(int var)
967{
968 return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
969 var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
970}
971
972static inline int hw_is_interval(int var)
973{
974 return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
975 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
976}
977
978static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
979 snd_pcm_hw_param_t var)
980{
981 return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
982}
983
984static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
985 snd_pcm_hw_param_t var)
986{
987 return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
988}
989
990static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
991 snd_pcm_hw_param_t var)
992{
993 return &params->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
994}
995
996static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
997 snd_pcm_hw_param_t var)
998{
999 return &params->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
1000}
1001
1002/**
1003 * params_channels - Get the number of channels from the hw params
1004 * @p: hw params
1005 *
1006 * Return: the number of channels
1007 */
1008static inline unsigned int params_channels(const struct snd_pcm_hw_params *p)
1009{
1010 return hw_param_interval_c(params: p, SNDRV_PCM_HW_PARAM_CHANNELS)->min;
1011}
1012
1013/**
1014 * params_rate - Get the sample rate from the hw params
1015 * @p: hw params
1016 *
1017 * Return: the sample rate
1018 */
1019static inline unsigned int params_rate(const struct snd_pcm_hw_params *p)
1020{
1021 return hw_param_interval_c(params: p, SNDRV_PCM_HW_PARAM_RATE)->min;
1022}
1023
1024/**
1025 * params_period_size - Get the period size (in frames) from the hw params
1026 * @p: hw params
1027 *
1028 * Return: the period size in frames
1029 */
1030static inline unsigned int params_period_size(const struct snd_pcm_hw_params *p)
1031{
1032 return hw_param_interval_c(params: p, SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min;
1033}
1034
1035/**
1036 * params_periods - Get the number of periods from the hw params
1037 * @p: hw params
1038 *
1039 * Return: the number of periods
1040 */
1041static inline unsigned int params_periods(const struct snd_pcm_hw_params *p)
1042{
1043 return hw_param_interval_c(params: p, SNDRV_PCM_HW_PARAM_PERIODS)->min;
1044}
1045
1046/**
1047 * params_buffer_size - Get the buffer size (in frames) from the hw params
1048 * @p: hw params
1049 *
1050 * Return: the buffer size in frames
1051 */
1052static inline unsigned int params_buffer_size(const struct snd_pcm_hw_params *p)
1053{
1054 return hw_param_interval_c(params: p, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min;
1055}
1056
1057/**
1058 * params_buffer_bytes - Get the buffer size (in bytes) from the hw params
1059 * @p: hw params
1060 *
1061 * Return: the buffer size in bytes
1062 */
1063static inline unsigned int params_buffer_bytes(const struct snd_pcm_hw_params *p)
1064{
1065 return hw_param_interval_c(params: p, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min;
1066}
1067
1068int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
1069int snd_interval_list(struct snd_interval *i, unsigned int count,
1070 const unsigned int *list, unsigned int mask);
1071int snd_interval_ranges(struct snd_interval *i, unsigned int count,
1072 const struct snd_interval *list, unsigned int mask);
1073int snd_interval_ratnum(struct snd_interval *i,
1074 unsigned int rats_count, const struct snd_ratnum *rats,
1075 unsigned int *nump, unsigned int *denp);
1076
1077void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
1078void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
1079
1080int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
1081
1082int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1083 u_int64_t mask);
1084int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1085 unsigned int min, unsigned int max);
1086int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
1087int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
1088 unsigned int cond,
1089 snd_pcm_hw_param_t var,
1090 const struct snd_pcm_hw_constraint_list *l);
1091int snd_pcm_hw_constraint_ranges(struct snd_pcm_runtime *runtime,
1092 unsigned int cond,
1093 snd_pcm_hw_param_t var,
1094 const struct snd_pcm_hw_constraint_ranges *r);
1095int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
1096 unsigned int cond,
1097 snd_pcm_hw_param_t var,
1098 const struct snd_pcm_hw_constraint_ratnums *r);
1099int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1100 unsigned int cond,
1101 snd_pcm_hw_param_t var,
1102 const struct snd_pcm_hw_constraint_ratdens *r);
1103int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1104 unsigned int cond,
1105 unsigned int width,
1106 unsigned int msbits);
1107int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1108 unsigned int cond,
1109 snd_pcm_hw_param_t var,
1110 unsigned long step);
1111int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1112 unsigned int cond,
1113 snd_pcm_hw_param_t var);
1114int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
1115 unsigned int base_rate);
1116int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
1117 unsigned int cond,
1118 int var,
1119 snd_pcm_hw_rule_func_t func, void *private,
1120 int dep, ...);
1121
1122/**
1123 * snd_pcm_hw_constraint_single() - Constrain parameter to a single value
1124 * @runtime: PCM runtime instance
1125 * @var: The hw_params variable to constrain
1126 * @val: The value to constrain to
1127 *
1128 * Return: Positive if the value is changed, zero if it's not changed, or a
1129 * negative error code.
1130 */
1131static inline int snd_pcm_hw_constraint_single(
1132 struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1133 unsigned int val)
1134{
1135 return snd_pcm_hw_constraint_minmax(runtime, var, min: val, max: val);
1136}
1137
1138int snd_pcm_format_signed(snd_pcm_format_t format);
1139int snd_pcm_format_unsigned(snd_pcm_format_t format);
1140int snd_pcm_format_linear(snd_pcm_format_t format);
1141int snd_pcm_format_little_endian(snd_pcm_format_t format);
1142int snd_pcm_format_big_endian(snd_pcm_format_t format);
1143#if 0 /* just for kernel-doc */
1144/**
1145 * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
1146 * @format: the format to check
1147 *
1148 * Return: 1 if the given PCM format is CPU-endian, 0 if
1149 * opposite, or a negative error code if endian not specified.
1150 */
1151int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
1152#endif /* DocBook */
1153#ifdef SNDRV_LITTLE_ENDIAN
1154#define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
1155#else
1156#define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
1157#endif
1158int snd_pcm_format_width(snd_pcm_format_t format); /* in bits */
1159int snd_pcm_format_physical_width(snd_pcm_format_t format); /* in bits */
1160ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
1161const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
1162int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
1163
1164void snd_pcm_set_ops(struct snd_pcm * pcm, int direction,
1165 const struct snd_pcm_ops *ops);
1166void snd_pcm_set_sync_per_card(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params,
1167 const unsigned char *id, unsigned int len);
1168/**
1169 * snd_pcm_set_sync - set the PCM sync id
1170 * @substream: the pcm substream
1171 *
1172 * Use the default PCM sync identifier for the specific card.
1173 */
1174static inline void snd_pcm_set_sync(struct snd_pcm_substream *substream)
1175{
1176 substream->runtime->std_sync_id = true;
1177}
1178int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1179 unsigned int cmd, void *arg);
1180void snd_pcm_period_elapsed_under_stream_lock(struct snd_pcm_substream *substream);
1181void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
1182snd_pcm_sframes_t __snd_pcm_lib_xfer(struct snd_pcm_substream *substream,
1183 void *buf, bool interleaved,
1184 snd_pcm_uframes_t frames, bool in_kernel);
1185
1186static inline snd_pcm_sframes_t
1187snd_pcm_lib_write(struct snd_pcm_substream *substream,
1188 const void __user *buf, snd_pcm_uframes_t frames)
1189{
1190 return __snd_pcm_lib_xfer(substream, buf: (void __force *)buf, interleaved: true, frames, in_kernel: false);
1191}
1192
1193static inline snd_pcm_sframes_t
1194snd_pcm_lib_read(struct snd_pcm_substream *substream,
1195 void __user *buf, snd_pcm_uframes_t frames)
1196{
1197 return __snd_pcm_lib_xfer(substream, buf: (void __force *)buf, interleaved: true, frames, in_kernel: false);
1198}
1199
1200static inline snd_pcm_sframes_t
1201snd_pcm_lib_writev(struct snd_pcm_substream *substream,
1202 void __user **bufs, snd_pcm_uframes_t frames)
1203{
1204 return __snd_pcm_lib_xfer(substream, buf: (void *)bufs, interleaved: false, frames, in_kernel: false);
1205}
1206
1207static inline snd_pcm_sframes_t
1208snd_pcm_lib_readv(struct snd_pcm_substream *substream,
1209 void __user **bufs, snd_pcm_uframes_t frames)
1210{
1211 return __snd_pcm_lib_xfer(substream, buf: (void *)bufs, interleaved: false, frames, in_kernel: false);
1212}
1213
1214static inline snd_pcm_sframes_t
1215snd_pcm_kernel_write(struct snd_pcm_substream *substream,
1216 const void *buf, snd_pcm_uframes_t frames)
1217{
1218 return __snd_pcm_lib_xfer(substream, buf: (void *)buf, interleaved: true, frames, in_kernel: true);
1219}
1220
1221static inline snd_pcm_sframes_t
1222snd_pcm_kernel_read(struct snd_pcm_substream *substream,
1223 void *buf, snd_pcm_uframes_t frames)
1224{
1225 return __snd_pcm_lib_xfer(substream, buf, interleaved: true, frames, in_kernel: true);
1226}
1227
1228static inline snd_pcm_sframes_t
1229snd_pcm_kernel_writev(struct snd_pcm_substream *substream,
1230 void **bufs, snd_pcm_uframes_t frames)
1231{
1232 return __snd_pcm_lib_xfer(substream, buf: bufs, interleaved: false, frames, in_kernel: true);
1233}
1234
1235static inline snd_pcm_sframes_t
1236snd_pcm_kernel_readv(struct snd_pcm_substream *substream,
1237 void **bufs, snd_pcm_uframes_t frames)
1238{
1239 return __snd_pcm_lib_xfer(substream, buf: bufs, interleaved: false, frames, in_kernel: true);
1240}
1241
1242int snd_pcm_hw_limit_rates(struct snd_pcm_hardware *hw);
1243
1244static inline int
1245snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime)
1246{
1247 return snd_pcm_hw_limit_rates(hw: &runtime->hw);
1248}
1249
1250unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate);
1251unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit);
1252unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a,
1253 unsigned int rates_b);
1254
1255/**
1256 * snd_pcm_set_runtime_buffer - Set the PCM runtime buffer
1257 * @substream: PCM substream to set
1258 * @bufp: the buffer information, NULL to clear
1259 *
1260 * Copy the buffer information to runtime->dma_buffer when @bufp is non-NULL.
1261 * Otherwise it clears the current buffer information.
1262 */
1263static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
1264 struct snd_dma_buffer *bufp)
1265{
1266 struct snd_pcm_runtime *runtime = substream->runtime;
1267 if (bufp) {
1268 runtime->dma_buffer_p = bufp;
1269 runtime->dma_area = bufp->area;
1270 runtime->dma_addr = bufp->addr;
1271 runtime->dma_bytes = bufp->bytes;
1272 } else {
1273 runtime->dma_buffer_p = NULL;
1274 runtime->dma_area = NULL;
1275 runtime->dma_addr = 0;
1276 runtime->dma_bytes = 0;
1277 }
1278}
1279
1280/**
1281 * snd_pcm_gettime - Fill the timespec64 depending on the timestamp mode
1282 * @runtime: PCM runtime instance
1283 * @tv: timespec64 to fill
1284 */
1285static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime,
1286 struct timespec64 *tv)
1287{
1288 switch (runtime->tstamp_type) {
1289 case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC:
1290 ktime_get_ts64(ts: tv);
1291 break;
1292 case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC_RAW:
1293 ktime_get_raw_ts64(ts: tv);
1294 break;
1295 default:
1296 ktime_get_real_ts64(tv);
1297 break;
1298 }
1299}
1300
1301/*
1302 * Memory
1303 */
1304
1305void snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
1306void snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
1307void snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
1308 int type, struct device *data,
1309 size_t size, size_t max);
1310void snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
1311 int type, void *data,
1312 size_t size, size_t max);
1313int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
1314int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
1315
1316int snd_pcm_set_managed_buffer(struct snd_pcm_substream *substream, int type,
1317 struct device *data, size_t size, size_t max);
1318int snd_pcm_set_managed_buffer_all(struct snd_pcm *pcm, int type,
1319 struct device *data,
1320 size_t size, size_t max);
1321
1322/**
1323 * snd_pcm_set_fixed_buffer - Preallocate and set up the fixed size PCM buffer
1324 * @substream: the pcm substream instance
1325 * @type: DMA type (SNDRV_DMA_TYPE_*)
1326 * @data: DMA type dependent data
1327 * @size: the requested pre-allocation size in bytes
1328 *
1329 * This is a variant of snd_pcm_set_managed_buffer(), but this pre-allocates
1330 * only the given sized buffer and doesn't allow re-allocation nor dynamic
1331 * allocation of a larger buffer unlike the standard one.
1332 * The function may return -ENOMEM error, hence the caller must check it.
1333 *
1334 * Return: zero if successful, or a negative error code
1335 */
1336static inline int __must_check
1337snd_pcm_set_fixed_buffer(struct snd_pcm_substream *substream, int type,
1338 struct device *data, size_t size)
1339{
1340 return snd_pcm_set_managed_buffer(substream, type, data, size, max: 0);
1341}
1342
1343/**
1344 * snd_pcm_set_fixed_buffer_all - Preallocate and set up the fixed size PCM buffer
1345 * @pcm: the pcm instance
1346 * @type: DMA type (SNDRV_DMA_TYPE_*)
1347 * @data: DMA type dependent data
1348 * @size: the requested pre-allocation size in bytes
1349 *
1350 * Apply the set up of the fixed buffer via snd_pcm_set_fixed_buffer() for
1351 * all substream. If any of allocation fails, it returns -ENOMEM, hence the
1352 * caller must check the return value.
1353 *
1354 * Return: zero if successful, or a negative error code
1355 */
1356static inline int __must_check
1357snd_pcm_set_fixed_buffer_all(struct snd_pcm *pcm, int type,
1358 struct device *data, size_t size)
1359{
1360 return snd_pcm_set_managed_buffer_all(pcm, type, data, size, max: 0);
1361}
1362
1363#define snd_pcm_get_dma_buf(substream) ((substream)->runtime->dma_buffer_p)
1364
1365/**
1366 * snd_pcm_sgbuf_get_addr - Get the DMA address at the corresponding offset
1367 * @substream: PCM substream
1368 * @ofs: byte offset
1369 *
1370 * Return: DMA address
1371 */
1372static inline dma_addr_t
1373snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
1374{
1375 return snd_sgbuf_get_addr(snd_pcm_get_dma_buf(substream), offset: ofs);
1376}
1377
1378/**
1379 * snd_pcm_sgbuf_get_chunk_size - Compute the max size that fits within the
1380 * contig. page from the given size
1381 * @substream: PCM substream
1382 * @ofs: byte offset
1383 * @size: byte size to examine
1384 *
1385 * Return: chunk size
1386 */
1387static inline unsigned int
1388snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
1389 unsigned int ofs, unsigned int size)
1390{
1391 return snd_sgbuf_get_chunk_size(snd_pcm_get_dma_buf(substream), ofs, size);
1392}
1393
1394int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
1395 struct vm_area_struct *area);
1396/* mmap for io-memory area */
1397#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
1398#define SNDRV_PCM_INFO_MMAP_IOMEM SNDRV_PCM_INFO_MMAP
1399int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
1400#else
1401#define SNDRV_PCM_INFO_MMAP_IOMEM 0
1402#define snd_pcm_lib_mmap_iomem NULL
1403#endif
1404
1405int snd_pcm_runtime_buffer_set_silence(struct snd_pcm_runtime *runtime);
1406
1407/**
1408 * snd_pcm_limit_isa_dma_size - Get the max size fitting with ISA DMA transfer
1409 * @dma: DMA number
1410 * @max: pointer to store the max size
1411 */
1412static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
1413{
1414 *max = dma < 4 ? 64 * 1024 : 128 * 1024;
1415}
1416
1417/*
1418 * Misc
1419 */
1420
1421#define SNDRV_PCM_DEFAULT_CON_SPDIF (IEC958_AES0_CON_EMPHASIS_NONE|\
1422 (IEC958_AES1_CON_ORIGINAL<<8)|\
1423 (IEC958_AES1_CON_PCM_CODER<<8)|\
1424 (IEC958_AES3_CON_FS_48000<<24))
1425
1426const char *snd_pcm_format_name(snd_pcm_format_t format);
1427
1428/**
1429 * snd_pcm_direction_name - Get a string naming the direction of a stream
1430 * @direction: Stream's direction, one of SNDRV_PCM_STREAM_XXX
1431 *
1432 * Returns a string naming the direction of the stream.
1433 */
1434static inline const char *snd_pcm_direction_name(int direction)
1435{
1436 if (direction == SNDRV_PCM_STREAM_PLAYBACK)
1437 return "Playback";
1438 else
1439 return "Capture";
1440}
1441
1442/**
1443 * snd_pcm_stream_str - Get a string naming the direction of a stream
1444 * @substream: the pcm substream instance
1445 *
1446 * Return: A string naming the direction of the stream.
1447 */
1448static inline const char *snd_pcm_stream_str(struct snd_pcm_substream *substream)
1449{
1450 return snd_pcm_direction_name(direction: substream->stream);
1451}
1452
1453/*
1454 * PCM channel-mapping control API
1455 */
1456/* array element of channel maps */
1457struct snd_pcm_chmap_elem {
1458 unsigned char channels;
1459 unsigned char map[15];
1460};
1461
1462/* channel map information; retrieved via snd_kcontrol_chip() */
1463struct snd_pcm_chmap {
1464 struct snd_pcm *pcm; /* assigned PCM instance */
1465 int stream; /* PLAYBACK or CAPTURE */
1466 struct snd_kcontrol *kctl;
1467 const struct snd_pcm_chmap_elem *chmap;
1468 unsigned int max_channels;
1469 unsigned int channel_mask; /* optional: active channels bitmask */
1470 void *private_data; /* optional: private data pointer */
1471};
1472
1473/**
1474 * snd_pcm_chmap_substream - get the PCM substream assigned to the given chmap info
1475 * @info: chmap information
1476 * @idx: the substream number index
1477 *
1478 * Return: the matched PCM substream, or NULL if not found
1479 */
1480static inline struct snd_pcm_substream *
1481snd_pcm_chmap_substream(struct snd_pcm_chmap *info, unsigned int idx)
1482{
1483 struct snd_pcm_substream *s;
1484 for (s = info->pcm->streams[info->stream].substream; s; s = s->next)
1485 if (s->number == idx)
1486 return s;
1487 return NULL;
1488}
1489
1490/* ALSA-standard channel maps (RL/RR prior to C/LFE) */
1491extern const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[];
1492/* Other world's standard channel maps (C/LFE prior to RL/RR) */
1493extern const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[];
1494
1495/* bit masks to be passed to snd_pcm_chmap.channel_mask field */
1496#define SND_PCM_CHMAP_MASK_24 ((1U << 2) | (1U << 4))
1497#define SND_PCM_CHMAP_MASK_246 (SND_PCM_CHMAP_MASK_24 | (1U << 6))
1498#define SND_PCM_CHMAP_MASK_2468 (SND_PCM_CHMAP_MASK_246 | (1U << 8))
1499
1500int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
1501 const struct snd_pcm_chmap_elem *chmap,
1502 int max_channels,
1503 unsigned long private_value,
1504 struct snd_pcm_chmap **info_ret);
1505
1506/**
1507 * pcm_format_to_bits - Strong-typed conversion of pcm_format to bitwise
1508 * @pcm_format: PCM format
1509 *
1510 * Return: 64bit mask corresponding to the given PCM format
1511 */
1512static inline u64 pcm_format_to_bits(snd_pcm_format_t pcm_format)
1513{
1514 return 1ULL << (__force int) pcm_format;
1515}
1516
1517/**
1518 * pcm_for_each_format - helper to iterate for each format type
1519 * @f: the iterator variable in snd_pcm_format_t type
1520 */
1521#define pcm_for_each_format(f) \
1522 for ((f) = SNDRV_PCM_FORMAT_FIRST; \
1523 (__force int)(f) <= (__force int)SNDRV_PCM_FORMAT_LAST; \
1524 (f) = (__force snd_pcm_format_t)((__force int)(f) + 1))
1525
1526/* printk helpers */
1527#define pcm_err(pcm, fmt, args...) \
1528 dev_err((pcm)->card->dev, fmt, ##args)
1529#define pcm_warn(pcm, fmt, args...) \
1530 dev_warn((pcm)->card->dev, fmt, ##args)
1531#define pcm_dbg(pcm, fmt, args...) \
1532 dev_dbg((pcm)->card->dev, fmt, ##args)
1533
1534/* helpers for copying between iov_iter and iomem */
1535size_t copy_to_iter_fromio(const void __iomem *src, size_t bytes,
1536 struct iov_iter *iter) __must_check;
1537size_t copy_from_iter_toio(void __iomem *dst, size_t bytes,
1538 struct iov_iter *iter) __must_check;
1539
1540struct snd_pcm_status64 {
1541 snd_pcm_state_t state; /* stream state */
1542 u8 rsvd[4];
1543 s64 trigger_tstamp_sec; /* time when stream was started/stopped/paused */
1544 s64 trigger_tstamp_nsec;
1545 s64 tstamp_sec; /* reference timestamp */
1546 s64 tstamp_nsec;
1547 snd_pcm_uframes_t appl_ptr; /* appl ptr */
1548 snd_pcm_uframes_t hw_ptr; /* hw ptr */
1549 snd_pcm_sframes_t delay; /* current delay in frames */
1550 snd_pcm_uframes_t avail; /* number of frames available */
1551 snd_pcm_uframes_t avail_max; /* max frames available on hw since last status */
1552 snd_pcm_uframes_t overrange; /* count of ADC (capture) overrange detections from last status */
1553 snd_pcm_state_t suspended_state; /* suspended stream state */
1554 __u32 audio_tstamp_data; /* needed for 64-bit alignment, used for configs/report to/from userspace */
1555 s64 audio_tstamp_sec; /* sample counter, wall clock, PHC or on-demand sync'ed */
1556 s64 audio_tstamp_nsec;
1557 s64 driver_tstamp_sec; /* useful in case reference system tstamp is reported with delay */
1558 s64 driver_tstamp_nsec;
1559 __u32 audio_tstamp_accuracy; /* in ns units, only valid if indicated in audio_tstamp_data */
1560 unsigned char reserved[52-4*sizeof(s64)]; /* must be filled with zero */
1561};
1562
1563#define SNDRV_PCM_IOCTL_STATUS64 _IOR('A', 0x20, struct snd_pcm_status64)
1564#define SNDRV_PCM_IOCTL_STATUS_EXT64 _IOWR('A', 0x24, struct snd_pcm_status64)
1565
1566struct snd_pcm_status32 {
1567 snd_pcm_state_t state; /* stream state */
1568 s32 trigger_tstamp_sec; /* time when stream was started/stopped/paused */
1569 s32 trigger_tstamp_nsec;
1570 s32 tstamp_sec; /* reference timestamp */
1571 s32 tstamp_nsec;
1572 u32 appl_ptr; /* appl ptr */
1573 u32 hw_ptr; /* hw ptr */
1574 s32 delay; /* current delay in frames */
1575 u32 avail; /* number of frames available */
1576 u32 avail_max; /* max frames available on hw since last status */
1577 u32 overrange; /* count of ADC (capture) overrange detections from last status */
1578 snd_pcm_state_t suspended_state; /* suspended stream state */
1579 u32 audio_tstamp_data; /* needed for 64-bit alignment, used for configs/report to/from userspace */
1580 s32 audio_tstamp_sec; /* sample counter, wall clock, PHC or on-demand sync'ed */
1581 s32 audio_tstamp_nsec;
1582 s32 driver_tstamp_sec; /* useful in case reference system tstamp is reported with delay */
1583 s32 driver_tstamp_nsec;
1584 u32 audio_tstamp_accuracy; /* in ns units, only valid if indicated in audio_tstamp_data */
1585 unsigned char reserved[52-4*sizeof(s32)]; /* must be filled with zero */
1586};
1587
1588#define SNDRV_PCM_IOCTL_STATUS32 _IOR('A', 0x20, struct snd_pcm_status32)
1589#define SNDRV_PCM_IOCTL_STATUS_EXT32 _IOWR('A', 0x24, struct snd_pcm_status32)
1590
1591#endif /* __SOUND_PCM_H */
1592

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