1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 #ifndef __SOUND_PCM_H
3 #define __SOUND_PCM_H
4
5 /*
6 * Digital Audio (PCM) abstract layer
7 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
8 * Abramo Bagnara <abramo@alsa-project.org>
9 */
10
11 #include <sound/asound.h>
12 #include <sound/memalloc.h>
13 #include <sound/minors.h>
14 #include <linux/poll.h>
15 #include <linux/mm.h>
16 #include <linux/bitops.h>
17 #include <linux/pm_qos.h>
18 #include <linux/refcount.h>
19
20 #define snd_pcm_substream_chip(substream) ((substream)->private_data)
21 #define snd_pcm_chip(pcm) ((pcm)->private_data)
22
23 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
24 #include <sound/pcm_oss.h>
25 #endif
26
27 /*
28 * Hardware (lowlevel) section
29 */
30
31 struct snd_pcm_hardware {
32 unsigned int info; /* SNDRV_PCM_INFO_* */
33 u64 formats; /* SNDRV_PCM_FMTBIT_* */
34 unsigned int rates; /* SNDRV_PCM_RATE_* */
35 unsigned int rate_min; /* min rate */
36 unsigned int rate_max; /* max rate */
37 unsigned int channels_min; /* min channels */
38 unsigned int channels_max; /* max channels */
39 size_t buffer_bytes_max; /* max buffer size */
40 size_t period_bytes_min; /* min period size */
41 size_t period_bytes_max; /* max period size */
42 unsigned int periods_min; /* min # of periods */
43 unsigned int periods_max; /* max # of periods */
44 size_t fifo_size; /* fifo size in bytes */
45 };
46
47 struct snd_pcm_status64;
48 struct snd_pcm_substream;
49
50 struct snd_pcm_audio_tstamp_config; /* definitions further down */
51 struct snd_pcm_audio_tstamp_report;
52
53 struct snd_pcm_ops {
54 int (*open)(struct snd_pcm_substream *substream);
55 int (*close)(struct snd_pcm_substream *substream);
56 int (*ioctl)(struct snd_pcm_substream * substream,
57 unsigned int cmd, void *arg);
58 int (*hw_params)(struct snd_pcm_substream *substream,
59 struct snd_pcm_hw_params *params);
60 int (*hw_free)(struct snd_pcm_substream *substream);
61 int (*prepare)(struct snd_pcm_substream *substream);
62 int (*trigger)(struct snd_pcm_substream *substream, int cmd);
63 int (*sync_stop)(struct snd_pcm_substream *substream);
64 snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *substream);
65 int (*get_time_info)(struct snd_pcm_substream *substream,
66 struct timespec64 *system_ts, struct timespec64 *audio_ts,
67 struct snd_pcm_audio_tstamp_config *audio_tstamp_config,
68 struct snd_pcm_audio_tstamp_report *audio_tstamp_report);
69 int (*fill_silence)(struct snd_pcm_substream *substream, int channel,
70 unsigned long pos, unsigned long bytes);
71 int (*copy_user)(struct snd_pcm_substream *substream, int channel,
72 unsigned long pos, void __user *buf,
73 unsigned long bytes);
74 int (*copy_kernel)(struct snd_pcm_substream *substream, int channel,
75 unsigned long pos, void *buf, unsigned long bytes);
76 struct page *(*page)(struct snd_pcm_substream *substream,
77 unsigned long offset);
78 int (*mmap)(struct snd_pcm_substream *substream, struct vm_area_struct *vma);
79 int (*ack)(struct snd_pcm_substream *substream);
80 };
81
82 /*
83 *
84 */
85
86 #if defined(CONFIG_SND_DYNAMIC_MINORS)
87 #define SNDRV_PCM_DEVICES (SNDRV_OS_MINORS-2)
88 #else
89 #define SNDRV_PCM_DEVICES 8
90 #endif
91
92 #define SNDRV_PCM_IOCTL1_RESET 0
93 /* 1 is absent slot. */
94 #define SNDRV_PCM_IOCTL1_CHANNEL_INFO 2
95 /* 3 is absent slot. */
96 #define SNDRV_PCM_IOCTL1_FIFO_SIZE 4
97
98 #define SNDRV_PCM_TRIGGER_STOP 0
99 #define SNDRV_PCM_TRIGGER_START 1
100 #define SNDRV_PCM_TRIGGER_PAUSE_PUSH 3
101 #define SNDRV_PCM_TRIGGER_PAUSE_RELEASE 4
102 #define SNDRV_PCM_TRIGGER_SUSPEND 5
103 #define SNDRV_PCM_TRIGGER_RESUME 6
104 #define SNDRV_PCM_TRIGGER_DRAIN 7
105
106 #define SNDRV_PCM_POS_XRUN ((snd_pcm_uframes_t)-1)
107
108 /* If you change this don't forget to change rates[] table in pcm_native.c */
109 #define SNDRV_PCM_RATE_5512 (1<<0) /* 5512Hz */
110 #define SNDRV_PCM_RATE_8000 (1<<1) /* 8000Hz */
111 #define SNDRV_PCM_RATE_11025 (1<<2) /* 11025Hz */
112 #define SNDRV_PCM_RATE_16000 (1<<3) /* 16000Hz */
113 #define SNDRV_PCM_RATE_22050 (1<<4) /* 22050Hz */
114 #define SNDRV_PCM_RATE_32000 (1<<5) /* 32000Hz */
115 #define SNDRV_PCM_RATE_44100 (1<<6) /* 44100Hz */
116 #define SNDRV_PCM_RATE_48000 (1<<7) /* 48000Hz */
117 #define SNDRV_PCM_RATE_64000 (1<<8) /* 64000Hz */
118 #define SNDRV_PCM_RATE_88200 (1<<9) /* 88200Hz */
119 #define SNDRV_PCM_RATE_96000 (1<<10) /* 96000Hz */
120 #define SNDRV_PCM_RATE_176400 (1<<11) /* 176400Hz */
121 #define SNDRV_PCM_RATE_192000 (1<<12) /* 192000Hz */
122 #define SNDRV_PCM_RATE_352800 (1<<13) /* 352800Hz */
123 #define SNDRV_PCM_RATE_384000 (1<<14) /* 384000Hz */
124
125 #define SNDRV_PCM_RATE_CONTINUOUS (1<<30) /* continuous range */
126 #define SNDRV_PCM_RATE_KNOT (1<<31) /* supports more non-continuos rates */
127
128 #define SNDRV_PCM_RATE_8000_44100 (SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_11025|\
129 SNDRV_PCM_RATE_16000|SNDRV_PCM_RATE_22050|\
130 SNDRV_PCM_RATE_32000|SNDRV_PCM_RATE_44100)
131 #define SNDRV_PCM_RATE_8000_48000 (SNDRV_PCM_RATE_8000_44100|SNDRV_PCM_RATE_48000)
132 #define SNDRV_PCM_RATE_8000_96000 (SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_64000|\
133 SNDRV_PCM_RATE_88200|SNDRV_PCM_RATE_96000)
134 #define SNDRV_PCM_RATE_8000_192000 (SNDRV_PCM_RATE_8000_96000|SNDRV_PCM_RATE_176400|\
135 SNDRV_PCM_RATE_192000)
136 #define SNDRV_PCM_RATE_8000_384000 (SNDRV_PCM_RATE_8000_192000|\
137 SNDRV_PCM_RATE_352800|\
138 SNDRV_PCM_RATE_384000)
139 #define _SNDRV_PCM_FMTBIT(fmt) (1ULL << (__force int)SNDRV_PCM_FORMAT_##fmt)
140 #define SNDRV_PCM_FMTBIT_S8 _SNDRV_PCM_FMTBIT(S8)
141 #define SNDRV_PCM_FMTBIT_U8 _SNDRV_PCM_FMTBIT(U8)
142 #define SNDRV_PCM_FMTBIT_S16_LE _SNDRV_PCM_FMTBIT(S16_LE)
143 #define SNDRV_PCM_FMTBIT_S16_BE _SNDRV_PCM_FMTBIT(S16_BE)
144 #define SNDRV_PCM_FMTBIT_U16_LE _SNDRV_PCM_FMTBIT(U16_LE)
145 #define SNDRV_PCM_FMTBIT_U16_BE _SNDRV_PCM_FMTBIT(U16_BE)
146 #define SNDRV_PCM_FMTBIT_S24_LE _SNDRV_PCM_FMTBIT(S24_LE)
147 #define SNDRV_PCM_FMTBIT_S24_BE _SNDRV_PCM_FMTBIT(S24_BE)
148 #define SNDRV_PCM_FMTBIT_U24_LE _SNDRV_PCM_FMTBIT(U24_LE)
149 #define SNDRV_PCM_FMTBIT_U24_BE _SNDRV_PCM_FMTBIT(U24_BE)
150 #define SNDRV_PCM_FMTBIT_S32_LE _SNDRV_PCM_FMTBIT(S32_LE)
151 #define SNDRV_PCM_FMTBIT_S32_BE _SNDRV_PCM_FMTBIT(S32_BE)
152 #define SNDRV_PCM_FMTBIT_U32_LE _SNDRV_PCM_FMTBIT(U32_LE)
153 #define SNDRV_PCM_FMTBIT_U32_BE _SNDRV_PCM_FMTBIT(U32_BE)
154 #define SNDRV_PCM_FMTBIT_FLOAT_LE _SNDRV_PCM_FMTBIT(FLOAT_LE)
155 #define SNDRV_PCM_FMTBIT_FLOAT_BE _SNDRV_PCM_FMTBIT(FLOAT_BE)
156 #define SNDRV_PCM_FMTBIT_FLOAT64_LE _SNDRV_PCM_FMTBIT(FLOAT64_LE)
157 #define SNDRV_PCM_FMTBIT_FLOAT64_BE _SNDRV_PCM_FMTBIT(FLOAT64_BE)
158 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_LE)
159 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_BE)
160 #define SNDRV_PCM_FMTBIT_MU_LAW _SNDRV_PCM_FMTBIT(MU_LAW)
161 #define SNDRV_PCM_FMTBIT_A_LAW _SNDRV_PCM_FMTBIT(A_LAW)
162 #define SNDRV_PCM_FMTBIT_IMA_ADPCM _SNDRV_PCM_FMTBIT(IMA_ADPCM)
163 #define SNDRV_PCM_FMTBIT_MPEG _SNDRV_PCM_FMTBIT(MPEG)
164 #define SNDRV_PCM_FMTBIT_GSM _SNDRV_PCM_FMTBIT(GSM)
165 #define SNDRV_PCM_FMTBIT_S20_LE _SNDRV_PCM_FMTBIT(S20_LE)
166 #define SNDRV_PCM_FMTBIT_U20_LE _SNDRV_PCM_FMTBIT(U20_LE)
167 #define SNDRV_PCM_FMTBIT_S20_BE _SNDRV_PCM_FMTBIT(S20_BE)
168 #define SNDRV_PCM_FMTBIT_U20_BE _SNDRV_PCM_FMTBIT(U20_BE)
169 #define SNDRV_PCM_FMTBIT_SPECIAL _SNDRV_PCM_FMTBIT(SPECIAL)
170 #define SNDRV_PCM_FMTBIT_S24_3LE _SNDRV_PCM_FMTBIT(S24_3LE)
171 #define SNDRV_PCM_FMTBIT_U24_3LE _SNDRV_PCM_FMTBIT(U24_3LE)
172 #define SNDRV_PCM_FMTBIT_S24_3BE _SNDRV_PCM_FMTBIT(S24_3BE)
173 #define SNDRV_PCM_FMTBIT_U24_3BE _SNDRV_PCM_FMTBIT(U24_3BE)
174 #define SNDRV_PCM_FMTBIT_S20_3LE _SNDRV_PCM_FMTBIT(S20_3LE)
175 #define SNDRV_PCM_FMTBIT_U20_3LE _SNDRV_PCM_FMTBIT(U20_3LE)
176 #define SNDRV_PCM_FMTBIT_S20_3BE _SNDRV_PCM_FMTBIT(S20_3BE)
177 #define SNDRV_PCM_FMTBIT_U20_3BE _SNDRV_PCM_FMTBIT(U20_3BE)
178 #define SNDRV_PCM_FMTBIT_S18_3LE _SNDRV_PCM_FMTBIT(S18_3LE)
179 #define SNDRV_PCM_FMTBIT_U18_3LE _SNDRV_PCM_FMTBIT(U18_3LE)
180 #define SNDRV_PCM_FMTBIT_S18_3BE _SNDRV_PCM_FMTBIT(S18_3BE)
181 #define SNDRV_PCM_FMTBIT_U18_3BE _SNDRV_PCM_FMTBIT(U18_3BE)
182 #define SNDRV_PCM_FMTBIT_G723_24 _SNDRV_PCM_FMTBIT(G723_24)
183 #define SNDRV_PCM_FMTBIT_G723_24_1B _SNDRV_PCM_FMTBIT(G723_24_1B)
184 #define SNDRV_PCM_FMTBIT_G723_40 _SNDRV_PCM_FMTBIT(G723_40)
185 #define SNDRV_PCM_FMTBIT_G723_40_1B _SNDRV_PCM_FMTBIT(G723_40_1B)
186 #define SNDRV_PCM_FMTBIT_DSD_U8 _SNDRV_PCM_FMTBIT(DSD_U8)
187 #define SNDRV_PCM_FMTBIT_DSD_U16_LE _SNDRV_PCM_FMTBIT(DSD_U16_LE)
188 #define SNDRV_PCM_FMTBIT_DSD_U32_LE _SNDRV_PCM_FMTBIT(DSD_U32_LE)
189 #define SNDRV_PCM_FMTBIT_DSD_U16_BE _SNDRV_PCM_FMTBIT(DSD_U16_BE)
190 #define SNDRV_PCM_FMTBIT_DSD_U32_BE _SNDRV_PCM_FMTBIT(DSD_U32_BE)
191
192 #ifdef SNDRV_LITTLE_ENDIAN
193 #define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_LE
194 #define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_LE
195 #define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_LE
196 #define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_LE
197 #define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_LE
198 #define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_LE
199 #define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_LE
200 #define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_LE
201 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE
202 #define SNDRV_PCM_FMTBIT_S20 SNDRV_PCM_FMTBIT_S20_LE
203 #define SNDRV_PCM_FMTBIT_U20 SNDRV_PCM_FMTBIT_U20_LE
204 #endif
205 #ifdef SNDRV_BIG_ENDIAN
206 #define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_BE
207 #define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_BE
208 #define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_BE
209 #define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_BE
210 #define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_BE
211 #define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_BE
212 #define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_BE
213 #define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_BE
214 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE
215 #define SNDRV_PCM_FMTBIT_S20 SNDRV_PCM_FMTBIT_S20_BE
216 #define SNDRV_PCM_FMTBIT_U20 SNDRV_PCM_FMTBIT_U20_BE
217 #endif
218
219 struct snd_pcm_file {
220 struct snd_pcm_substream *substream;
221 int no_compat_mmap;
222 unsigned int user_pversion; /* supported protocol version */
223 };
224
225 struct snd_pcm_hw_rule;
226 typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params,
227 struct snd_pcm_hw_rule *rule);
228
229 struct snd_pcm_hw_rule {
230 unsigned int cond;
231 int var;
232 int deps[4];
233
234 snd_pcm_hw_rule_func_t func;
235 void *private;
236 };
237
238 struct snd_pcm_hw_constraints {
239 struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK -
240 SNDRV_PCM_HW_PARAM_FIRST_MASK + 1];
241 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL -
242 SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
243 unsigned int rules_num;
244 unsigned int rules_all;
245 struct snd_pcm_hw_rule *rules;
246 };
247
constrs_mask(struct snd_pcm_hw_constraints * constrs,snd_pcm_hw_param_t var)248 static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs,
249 snd_pcm_hw_param_t var)
250 {
251 return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
252 }
253
constrs_interval(struct snd_pcm_hw_constraints * constrs,snd_pcm_hw_param_t var)254 static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs,
255 snd_pcm_hw_param_t var)
256 {
257 return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
258 }
259
260 struct snd_ratnum {
261 unsigned int num;
262 unsigned int den_min, den_max, den_step;
263 };
264
265 struct snd_ratden {
266 unsigned int num_min, num_max, num_step;
267 unsigned int den;
268 };
269
270 struct snd_pcm_hw_constraint_ratnums {
271 int nrats;
272 const struct snd_ratnum *rats;
273 };
274
275 struct snd_pcm_hw_constraint_ratdens {
276 int nrats;
277 const struct snd_ratden *rats;
278 };
279
280 struct snd_pcm_hw_constraint_list {
281 const unsigned int *list;
282 unsigned int count;
283 unsigned int mask;
284 };
285
286 struct snd_pcm_hw_constraint_ranges {
287 unsigned int count;
288 const struct snd_interval *ranges;
289 unsigned int mask;
290 };
291
292 /*
293 * userspace-provided audio timestamp config to kernel,
294 * structure is for internal use only and filled with dedicated unpack routine
295 */
296 struct snd_pcm_audio_tstamp_config {
297 /* 5 of max 16 bits used */
298 u32 type_requested:4;
299 u32 report_delay:1; /* add total delay to A/D or D/A */
300 };
301
snd_pcm_unpack_audio_tstamp_config(__u32 data,struct snd_pcm_audio_tstamp_config * config)302 static inline void snd_pcm_unpack_audio_tstamp_config(__u32 data,
303 struct snd_pcm_audio_tstamp_config *config)
304 {
305 config->type_requested = data & 0xF;
306 config->report_delay = (data >> 4) & 1;
307 }
308
309 /*
310 * kernel-provided audio timestamp report to user-space
311 * structure is for internal use only and read by dedicated pack routine
312 */
313 struct snd_pcm_audio_tstamp_report {
314 /* 6 of max 16 bits used for bit-fields */
315
316 /* for backwards compatibility */
317 u32 valid:1;
318
319 /* actual type if hardware could not support requested timestamp */
320 u32 actual_type:4;
321
322 /* accuracy represented in ns units */
323 u32 accuracy_report:1; /* 0 if accuracy unknown, 1 if accuracy field is valid */
324 u32 accuracy; /* up to 4.29s, will be packed in separate field */
325 };
326
snd_pcm_pack_audio_tstamp_report(__u32 * data,__u32 * accuracy,const struct snd_pcm_audio_tstamp_report * report)327 static inline void snd_pcm_pack_audio_tstamp_report(__u32 *data, __u32 *accuracy,
328 const struct snd_pcm_audio_tstamp_report *report)
329 {
330 u32 tmp;
331
332 tmp = report->accuracy_report;
333 tmp <<= 4;
334 tmp |= report->actual_type;
335 tmp <<= 1;
336 tmp |= report->valid;
337
338 *data &= 0xffff; /* zero-clear MSBs */
339 *data |= (tmp << 16);
340 *accuracy = report->accuracy;
341 }
342
343
344 struct snd_pcm_runtime {
345 /* -- Status -- */
346 struct snd_pcm_substream *trigger_master;
347 struct timespec64 trigger_tstamp; /* trigger timestamp */
348 bool trigger_tstamp_latched; /* trigger timestamp latched in low-level driver/hardware */
349 int overrange;
350 snd_pcm_uframes_t avail_max;
351 snd_pcm_uframes_t hw_ptr_base; /* Position at buffer restart */
352 snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time */
353 unsigned long hw_ptr_jiffies; /* Time when hw_ptr is updated */
354 unsigned long hw_ptr_buffer_jiffies; /* buffer time in jiffies */
355 snd_pcm_sframes_t delay; /* extra delay; typically FIFO size */
356 u64 hw_ptr_wrap; /* offset for hw_ptr due to boundary wrap-around */
357
358 /* -- HW params -- */
359 snd_pcm_access_t access; /* access mode */
360 snd_pcm_format_t format; /* SNDRV_PCM_FORMAT_* */
361 snd_pcm_subformat_t subformat; /* subformat */
362 unsigned int rate; /* rate in Hz */
363 unsigned int channels; /* channels */
364 snd_pcm_uframes_t period_size; /* period size */
365 unsigned int periods; /* periods */
366 snd_pcm_uframes_t buffer_size; /* buffer size */
367 snd_pcm_uframes_t min_align; /* Min alignment for the format */
368 size_t byte_align;
369 unsigned int frame_bits;
370 unsigned int sample_bits;
371 unsigned int info;
372 unsigned int rate_num;
373 unsigned int rate_den;
374 unsigned int no_period_wakeup: 1;
375
376 /* -- SW params -- */
377 int tstamp_mode; /* mmap timestamp is updated */
378 unsigned int period_step;
379 snd_pcm_uframes_t start_threshold;
380 snd_pcm_uframes_t stop_threshold;
381 snd_pcm_uframes_t silence_threshold; /* Silence filling happens when
382 noise is nearest than this */
383 snd_pcm_uframes_t silence_size; /* Silence filling size */
384 snd_pcm_uframes_t boundary; /* pointers wrap point */
385
386 snd_pcm_uframes_t silence_start; /* starting pointer to silence area */
387 snd_pcm_uframes_t silence_filled; /* size filled with silence */
388
389 union snd_pcm_sync_id sync; /* hardware synchronization ID */
390
391 /* -- mmap -- */
392 struct snd_pcm_mmap_status *status;
393 struct snd_pcm_mmap_control *control;
394
395 /* -- locking / scheduling -- */
396 snd_pcm_uframes_t twake; /* do transfer (!poll) wakeup if non-zero */
397 wait_queue_head_t sleep; /* poll sleep */
398 wait_queue_head_t tsleep; /* transfer sleep */
399 struct fasync_struct *fasync;
400 bool stop_operating; /* sync_stop will be called */
401 struct mutex buffer_mutex; /* protect for buffer changes */
402
403 /* -- private section -- */
404 void *private_data;
405 void (*private_free)(struct snd_pcm_runtime *runtime);
406
407 /* -- hardware description -- */
408 struct snd_pcm_hardware hw;
409 struct snd_pcm_hw_constraints hw_constraints;
410
411 /* -- timer -- */
412 unsigned int timer_resolution; /* timer resolution */
413 int tstamp_type; /* timestamp type */
414
415 /* -- DMA -- */
416 unsigned char *dma_area; /* DMA area */
417 dma_addr_t dma_addr; /* physical bus address (not accessible from main CPU) */
418 size_t dma_bytes; /* size of DMA area */
419
420 struct snd_dma_buffer *dma_buffer_p; /* allocated buffer */
421 unsigned int buffer_changed:1; /* buffer allocation changed; set only in managed mode */
422
423 /* -- audio timestamp config -- */
424 struct snd_pcm_audio_tstamp_config audio_tstamp_config;
425 struct snd_pcm_audio_tstamp_report audio_tstamp_report;
426 struct timespec64 driver_tstamp;
427
428 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
429 /* -- OSS things -- */
430 struct snd_pcm_oss_runtime oss;
431 #endif
432 };
433
434 struct snd_pcm_group { /* keep linked substreams */
435 spinlock_t lock;
436 struct mutex mutex;
437 struct list_head substreams;
438 refcount_t refs;
439 };
440
441 struct pid;
442
443 struct snd_pcm_substream {
444 struct snd_pcm *pcm;
445 struct snd_pcm_str *pstr;
446 void *private_data; /* copied from pcm->private_data */
447 int number;
448 char name[32]; /* substream name */
449 int stream; /* stream (direction) */
450 struct pm_qos_request latency_pm_qos_req; /* pm_qos request */
451 size_t buffer_bytes_max; /* limit ring buffer size */
452 struct snd_dma_buffer dma_buffer;
453 size_t dma_max;
454 /* -- hardware operations -- */
455 const struct snd_pcm_ops *ops;
456 /* -- runtime information -- */
457 struct snd_pcm_runtime *runtime;
458 /* -- timer section -- */
459 struct snd_timer *timer; /* timer */
460 unsigned timer_running: 1; /* time is running */
461 long wait_time; /* time in ms for R/W to wait for avail */
462 /* -- next substream -- */
463 struct snd_pcm_substream *next;
464 /* -- linked substreams -- */
465 struct list_head link_list; /* linked list member */
466 struct snd_pcm_group self_group; /* fake group for non linked substream (with substream lock inside) */
467 struct snd_pcm_group *group; /* pointer to current group */
468 /* -- assigned files -- */
469 int ref_count;
470 atomic_t mmap_count;
471 unsigned int f_flags;
472 void (*pcm_release)(struct snd_pcm_substream *);
473 struct pid *pid;
474 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
475 /* -- OSS things -- */
476 struct snd_pcm_oss_substream oss;
477 #endif
478 #ifdef CONFIG_SND_VERBOSE_PROCFS
479 struct snd_info_entry *proc_root;
480 #endif /* CONFIG_SND_VERBOSE_PROCFS */
481 /* misc flags */
482 unsigned int hw_opened: 1;
483 unsigned int managed_buffer_alloc:1;
484 };
485
486 #define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0)
487
488
489 struct snd_pcm_str {
490 int stream; /* stream (direction) */
491 struct snd_pcm *pcm;
492 /* -- substreams -- */
493 unsigned int substream_count;
494 unsigned int substream_opened;
495 struct snd_pcm_substream *substream;
496 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
497 /* -- OSS things -- */
498 struct snd_pcm_oss_stream oss;
499 #endif
500 #ifdef CONFIG_SND_VERBOSE_PROCFS
501 struct snd_info_entry *proc_root;
502 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
503 unsigned int xrun_debug; /* 0 = disabled, 1 = verbose, 2 = stacktrace */
504 #endif
505 #endif
506 struct snd_kcontrol *chmap_kctl; /* channel-mapping controls */
507 struct device dev;
508 };
509
510 struct snd_pcm {
511 struct snd_card *card;
512 struct list_head list;
513 int device; /* device number */
514 unsigned int info_flags;
515 unsigned short dev_class;
516 unsigned short dev_subclass;
517 char id[64];
518 char name[80];
519 struct snd_pcm_str streams[2];
520 struct mutex open_mutex;
521 wait_queue_head_t open_wait;
522 void *private_data;
523 void (*private_free) (struct snd_pcm *pcm);
524 bool internal; /* pcm is for internal use only */
525 bool nonatomic; /* whole PCM operations are in non-atomic context */
526 bool no_device_suspend; /* don't invoke device PM suspend */
527 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
528 struct snd_pcm_oss oss;
529 #endif
530 };
531
532 /*
533 * Registering
534 */
535
536 extern const struct file_operations snd_pcm_f_ops[2];
537
538 int snd_pcm_new(struct snd_card *card, const char *id, int device,
539 int playback_count, int capture_count,
540 struct snd_pcm **rpcm);
541 int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
542 int playback_count, int capture_count,
543 struct snd_pcm **rpcm);
544 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
545
546 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
547 struct snd_pcm_notify {
548 int (*n_register) (struct snd_pcm * pcm);
549 int (*n_disconnect) (struct snd_pcm * pcm);
550 int (*n_unregister) (struct snd_pcm * pcm);
551 struct list_head list;
552 };
553 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
554 #endif
555
556 /*
557 * Native I/O
558 */
559
560 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
561 int snd_pcm_info_user(struct snd_pcm_substream *substream,
562 struct snd_pcm_info __user *info);
563 int snd_pcm_status64(struct snd_pcm_substream *substream,
564 struct snd_pcm_status64 *status);
565 int snd_pcm_start(struct snd_pcm_substream *substream);
566 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t status);
567 int snd_pcm_drain_done(struct snd_pcm_substream *substream);
568 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream);
569 #ifdef CONFIG_PM
570 int snd_pcm_suspend_all(struct snd_pcm *pcm);
571 #else
snd_pcm_suspend_all(struct snd_pcm * pcm)572 static inline int snd_pcm_suspend_all(struct snd_pcm *pcm)
573 {
574 return 0;
575 }
576 #endif
577 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
578 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
579 struct snd_pcm_substream **rsubstream);
580 void snd_pcm_release_substream(struct snd_pcm_substream *substream);
581 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
582 struct snd_pcm_substream **rsubstream);
583 void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
584 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
585
586
587 #ifdef CONFIG_SND_DEBUG
588 void snd_pcm_debug_name(struct snd_pcm_substream *substream,
589 char *name, size_t len);
590 #else
591 static inline void
snd_pcm_debug_name(struct snd_pcm_substream * substream,char * buf,size_t size)592 snd_pcm_debug_name(struct snd_pcm_substream *substream, char *buf, size_t size)
593 {
594 *buf = 0;
595 }
596 #endif
597
598 /*
599 * PCM library
600 */
601
602 /**
603 * snd_pcm_stream_linked - Check whether the substream is linked with others
604 * @substream: substream to check
605 *
606 * Returns true if the given substream is being linked with others.
607 */
snd_pcm_stream_linked(struct snd_pcm_substream * substream)608 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
609 {
610 return substream->group != &substream->self_group;
611 }
612
613 void snd_pcm_stream_lock(struct snd_pcm_substream *substream);
614 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream);
615 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream);
616 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream);
617 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream);
618
619 /**
620 * snd_pcm_stream_lock_irqsave - Lock the PCM stream
621 * @substream: PCM substream
622 * @flags: irq flags
623 *
624 * This locks the PCM stream like snd_pcm_stream_lock() but with the local
625 * IRQ (only when nonatomic is false). In nonatomic case, this is identical
626 * as snd_pcm_stream_lock().
627 */
628 #define snd_pcm_stream_lock_irqsave(substream, flags) \
629 do { \
630 typecheck(unsigned long, flags); \
631 flags = _snd_pcm_stream_lock_irqsave(substream); \
632 } while (0)
633 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
634 unsigned long flags);
635
636 /**
637 * snd_pcm_group_for_each_entry - iterate over the linked substreams
638 * @s: the iterator
639 * @substream: the substream
640 *
641 * Iterate over the all linked substreams to the given @substream.
642 * When @substream isn't linked with any others, this gives returns @substream
643 * itself once.
644 */
645 #define snd_pcm_group_for_each_entry(s, substream) \
646 list_for_each_entry(s, &substream->group->substreams, link_list)
647
648 #define for_each_pcm_streams(stream) \
649 for (stream = SNDRV_PCM_STREAM_PLAYBACK; \
650 stream <= SNDRV_PCM_STREAM_LAST; \
651 stream++)
652
653 /**
654 * snd_pcm_running - Check whether the substream is in a running state
655 * @substream: substream to check
656 *
657 * Returns true if the given substream is in the state RUNNING, or in the
658 * state DRAINING for playback.
659 */
snd_pcm_running(struct snd_pcm_substream * substream)660 static inline int snd_pcm_running(struct snd_pcm_substream *substream)
661 {
662 return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
663 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
664 substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
665 }
666
667 /**
668 * bytes_to_samples - Unit conversion of the size from bytes to samples
669 * @runtime: PCM runtime instance
670 * @size: size in bytes
671 */
bytes_to_samples(struct snd_pcm_runtime * runtime,ssize_t size)672 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
673 {
674 return size * 8 / runtime->sample_bits;
675 }
676
677 /**
678 * bytes_to_frames - Unit conversion of the size from bytes to frames
679 * @runtime: PCM runtime instance
680 * @size: size in bytes
681 */
bytes_to_frames(struct snd_pcm_runtime * runtime,ssize_t size)682 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
683 {
684 return size * 8 / runtime->frame_bits;
685 }
686
687 /**
688 * samples_to_bytes - Unit conversion of the size from samples to bytes
689 * @runtime: PCM runtime instance
690 * @size: size in samples
691 */
samples_to_bytes(struct snd_pcm_runtime * runtime,ssize_t size)692 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
693 {
694 return size * runtime->sample_bits / 8;
695 }
696
697 /**
698 * frames_to_bytes - Unit conversion of the size from frames to bytes
699 * @runtime: PCM runtime instance
700 * @size: size in frames
701 */
frames_to_bytes(struct snd_pcm_runtime * runtime,snd_pcm_sframes_t size)702 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
703 {
704 return size * runtime->frame_bits / 8;
705 }
706
707 /**
708 * frame_aligned - Check whether the byte size is aligned to frames
709 * @runtime: PCM runtime instance
710 * @bytes: size in bytes
711 */
frame_aligned(struct snd_pcm_runtime * runtime,ssize_t bytes)712 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
713 {
714 return bytes % runtime->byte_align == 0;
715 }
716
717 /**
718 * snd_pcm_lib_buffer_bytes - Get the buffer size of the current PCM in bytes
719 * @substream: PCM substream
720 */
snd_pcm_lib_buffer_bytes(struct snd_pcm_substream * substream)721 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
722 {
723 struct snd_pcm_runtime *runtime = substream->runtime;
724 return frames_to_bytes(runtime, runtime->buffer_size);
725 }
726
727 /**
728 * snd_pcm_lib_period_bytes - Get the period size of the current PCM in bytes
729 * @substream: PCM substream
730 */
snd_pcm_lib_period_bytes(struct snd_pcm_substream * substream)731 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
732 {
733 struct snd_pcm_runtime *runtime = substream->runtime;
734 return frames_to_bytes(runtime, runtime->period_size);
735 }
736
737 /**
738 * snd_pcm_playback_avail - Get the available (writable) space for playback
739 * @runtime: PCM runtime instance
740 *
741 * Result is between 0 ... (boundary - 1)
742 */
snd_pcm_playback_avail(struct snd_pcm_runtime * runtime)743 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
744 {
745 snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
746 if (avail < 0)
747 avail += runtime->boundary;
748 else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
749 avail -= runtime->boundary;
750 return avail;
751 }
752
753 /**
754 * snd_pcm_capture_avail - Get the available (readable) space for capture
755 * @runtime: PCM runtime instance
756 *
757 * Result is between 0 ... (boundary - 1)
758 */
snd_pcm_capture_avail(struct snd_pcm_runtime * runtime)759 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
760 {
761 snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
762 if (avail < 0)
763 avail += runtime->boundary;
764 return avail;
765 }
766
767 /**
768 * snd_pcm_playback_hw_avail - Get the queued space for playback
769 * @runtime: PCM runtime instance
770 */
snd_pcm_playback_hw_avail(struct snd_pcm_runtime * runtime)771 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
772 {
773 return runtime->buffer_size - snd_pcm_playback_avail(runtime);
774 }
775
776 /**
777 * snd_pcm_capture_hw_avail - Get the free space for capture
778 * @runtime: PCM runtime instance
779 */
snd_pcm_capture_hw_avail(struct snd_pcm_runtime * runtime)780 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
781 {
782 return runtime->buffer_size - snd_pcm_capture_avail(runtime);
783 }
784
785 /**
786 * snd_pcm_playback_ready - check whether the playback buffer is available
787 * @substream: the pcm substream instance
788 *
789 * Checks whether enough free space is available on the playback buffer.
790 *
791 * Return: Non-zero if available, or zero if not.
792 */
snd_pcm_playback_ready(struct snd_pcm_substream * substream)793 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
794 {
795 struct snd_pcm_runtime *runtime = substream->runtime;
796 return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
797 }
798
799 /**
800 * snd_pcm_capture_ready - check whether the capture buffer is available
801 * @substream: the pcm substream instance
802 *
803 * Checks whether enough capture data is available on the capture buffer.
804 *
805 * Return: Non-zero if available, or zero if not.
806 */
snd_pcm_capture_ready(struct snd_pcm_substream * substream)807 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
808 {
809 struct snd_pcm_runtime *runtime = substream->runtime;
810 return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
811 }
812
813 /**
814 * snd_pcm_playback_data - check whether any data exists on the playback buffer
815 * @substream: the pcm substream instance
816 *
817 * Checks whether any data exists on the playback buffer.
818 *
819 * Return: Non-zero if any data exists, or zero if not. If stop_threshold
820 * is bigger or equal to boundary, then this function returns always non-zero.
821 */
snd_pcm_playback_data(struct snd_pcm_substream * substream)822 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
823 {
824 struct snd_pcm_runtime *runtime = substream->runtime;
825
826 if (runtime->stop_threshold >= runtime->boundary)
827 return 1;
828 return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
829 }
830
831 /**
832 * snd_pcm_playback_empty - check whether the playback buffer is empty
833 * @substream: the pcm substream instance
834 *
835 * Checks whether the playback buffer is empty.
836 *
837 * Return: Non-zero if empty, or zero if not.
838 */
snd_pcm_playback_empty(struct snd_pcm_substream * substream)839 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
840 {
841 struct snd_pcm_runtime *runtime = substream->runtime;
842 return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
843 }
844
845 /**
846 * snd_pcm_capture_empty - check whether the capture buffer is empty
847 * @substream: the pcm substream instance
848 *
849 * Checks whether the capture buffer is empty.
850 *
851 * Return: Non-zero if empty, or zero if not.
852 */
snd_pcm_capture_empty(struct snd_pcm_substream * substream)853 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
854 {
855 struct snd_pcm_runtime *runtime = substream->runtime;
856 return snd_pcm_capture_avail(runtime) == 0;
857 }
858
859 /**
860 * snd_pcm_trigger_done - Mark the master substream
861 * @substream: the pcm substream instance
862 * @master: the linked master substream
863 *
864 * When multiple substreams of the same card are linked and the hardware
865 * supports the single-shot operation, the driver calls this in the loop
866 * in snd_pcm_group_for_each_entry() for marking the substream as "done".
867 * Then most of trigger operations are performed only to the given master
868 * substream.
869 *
870 * The trigger_master mark is cleared at timestamp updates at the end
871 * of trigger operations.
872 */
snd_pcm_trigger_done(struct snd_pcm_substream * substream,struct snd_pcm_substream * master)873 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream,
874 struct snd_pcm_substream *master)
875 {
876 substream->runtime->trigger_master = master;
877 }
878
hw_is_mask(int var)879 static inline int hw_is_mask(int var)
880 {
881 return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
882 var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
883 }
884
hw_is_interval(int var)885 static inline int hw_is_interval(int var)
886 {
887 return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
888 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
889 }
890
hw_param_mask(struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var)891 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
892 snd_pcm_hw_param_t var)
893 {
894 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
895 }
896
hw_param_interval(struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var)897 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
898 snd_pcm_hw_param_t var)
899 {
900 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
901 }
902
hw_param_mask_c(const struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var)903 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
904 snd_pcm_hw_param_t var)
905 {
906 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
907 }
908
hw_param_interval_c(const struct snd_pcm_hw_params * params,snd_pcm_hw_param_t var)909 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
910 snd_pcm_hw_param_t var)
911 {
912 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
913 }
914
915 /**
916 * params_channels - Get the number of channels from the hw params
917 * @p: hw params
918 */
params_channels(const struct snd_pcm_hw_params * p)919 static inline unsigned int params_channels(const struct snd_pcm_hw_params *p)
920 {
921 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_CHANNELS)->min;
922 }
923
924 /**
925 * params_rate - Get the sample rate from the hw params
926 * @p: hw params
927 */
params_rate(const struct snd_pcm_hw_params * p)928 static inline unsigned int params_rate(const struct snd_pcm_hw_params *p)
929 {
930 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_RATE)->min;
931 }
932
933 /**
934 * params_period_size - Get the period size (in frames) from the hw params
935 * @p: hw params
936 */
params_period_size(const struct snd_pcm_hw_params * p)937 static inline unsigned int params_period_size(const struct snd_pcm_hw_params *p)
938 {
939 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min;
940 }
941
942 /**
943 * params_periods - Get the number of periods from the hw params
944 * @p: hw params
945 */
params_periods(const struct snd_pcm_hw_params * p)946 static inline unsigned int params_periods(const struct snd_pcm_hw_params *p)
947 {
948 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIODS)->min;
949 }
950
951 /**
952 * params_buffer_size - Get the buffer size (in frames) from the hw params
953 * @p: hw params
954 */
params_buffer_size(const struct snd_pcm_hw_params * p)955 static inline unsigned int params_buffer_size(const struct snd_pcm_hw_params *p)
956 {
957 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min;
958 }
959
960 /**
961 * params_buffer_bytes - Get the buffer size (in bytes) from the hw params
962 * @p: hw params
963 */
params_buffer_bytes(const struct snd_pcm_hw_params * p)964 static inline unsigned int params_buffer_bytes(const struct snd_pcm_hw_params *p)
965 {
966 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min;
967 }
968
969 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
970 int snd_interval_list(struct snd_interval *i, unsigned int count,
971 const unsigned int *list, unsigned int mask);
972 int snd_interval_ranges(struct snd_interval *i, unsigned int count,
973 const struct snd_interval *list, unsigned int mask);
974 int snd_interval_ratnum(struct snd_interval *i,
975 unsigned int rats_count, const struct snd_ratnum *rats,
976 unsigned int *nump, unsigned int *denp);
977
978 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
979 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
980
981 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
982
983 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
984 u_int64_t mask);
985 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
986 unsigned int min, unsigned int max);
987 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
988 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
989 unsigned int cond,
990 snd_pcm_hw_param_t var,
991 const struct snd_pcm_hw_constraint_list *l);
992 int snd_pcm_hw_constraint_ranges(struct snd_pcm_runtime *runtime,
993 unsigned int cond,
994 snd_pcm_hw_param_t var,
995 const struct snd_pcm_hw_constraint_ranges *r);
996 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
997 unsigned int cond,
998 snd_pcm_hw_param_t var,
999 const struct snd_pcm_hw_constraint_ratnums *r);
1000 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1001 unsigned int cond,
1002 snd_pcm_hw_param_t var,
1003 const struct snd_pcm_hw_constraint_ratdens *r);
1004 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1005 unsigned int cond,
1006 unsigned int width,
1007 unsigned int msbits);
1008 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1009 unsigned int cond,
1010 snd_pcm_hw_param_t var,
1011 unsigned long step);
1012 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1013 unsigned int cond,
1014 snd_pcm_hw_param_t var);
1015 int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
1016 unsigned int base_rate);
1017 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
1018 unsigned int cond,
1019 int var,
1020 snd_pcm_hw_rule_func_t func, void *private,
1021 int dep, ...);
1022
1023 /**
1024 * snd_pcm_hw_constraint_single() - Constrain parameter to a single value
1025 * @runtime: PCM runtime instance
1026 * @var: The hw_params variable to constrain
1027 * @val: The value to constrain to
1028 *
1029 * Return: Positive if the value is changed, zero if it's not changed, or a
1030 * negative error code.
1031 */
snd_pcm_hw_constraint_single(struct snd_pcm_runtime * runtime,snd_pcm_hw_param_t var,unsigned int val)1032 static inline int snd_pcm_hw_constraint_single(
1033 struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1034 unsigned int val)
1035 {
1036 return snd_pcm_hw_constraint_minmax(runtime, var, val, val);
1037 }
1038
1039 int snd_pcm_format_signed(snd_pcm_format_t format);
1040 int snd_pcm_format_unsigned(snd_pcm_format_t format);
1041 int snd_pcm_format_linear(snd_pcm_format_t format);
1042 int snd_pcm_format_little_endian(snd_pcm_format_t format);
1043 int snd_pcm_format_big_endian(snd_pcm_format_t format);
1044 #if 0 /* just for kernel-doc */
1045 /**
1046 * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
1047 * @format: the format to check
1048 *
1049 * Return: 1 if the given PCM format is CPU-endian, 0 if
1050 * opposite, or a negative error code if endian not specified.
1051 */
1052 int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
1053 #endif /* DocBook */
1054 #ifdef SNDRV_LITTLE_ENDIAN
1055 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
1056 #else
1057 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
1058 #endif
1059 int snd_pcm_format_width(snd_pcm_format_t format); /* in bits */
1060 int snd_pcm_format_physical_width(snd_pcm_format_t format); /* in bits */
1061 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
1062 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
1063 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
1064
1065 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction,
1066 const struct snd_pcm_ops *ops);
1067 void snd_pcm_set_sync(struct snd_pcm_substream *substream);
1068 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1069 unsigned int cmd, void *arg);
1070 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
1071 snd_pcm_sframes_t __snd_pcm_lib_xfer(struct snd_pcm_substream *substream,
1072 void *buf, bool interleaved,
1073 snd_pcm_uframes_t frames, bool in_kernel);
1074
1075 static inline snd_pcm_sframes_t
snd_pcm_lib_write(struct snd_pcm_substream * substream,const void __user * buf,snd_pcm_uframes_t frames)1076 snd_pcm_lib_write(struct snd_pcm_substream *substream,
1077 const void __user *buf, snd_pcm_uframes_t frames)
1078 {
1079 return __snd_pcm_lib_xfer(substream, (void __force *)buf, true, frames, false);
1080 }
1081
1082 static inline snd_pcm_sframes_t
snd_pcm_lib_read(struct snd_pcm_substream * substream,void __user * buf,snd_pcm_uframes_t frames)1083 snd_pcm_lib_read(struct snd_pcm_substream *substream,
1084 void __user *buf, snd_pcm_uframes_t frames)
1085 {
1086 return __snd_pcm_lib_xfer(substream, (void __force *)buf, true, frames, false);
1087 }
1088
1089 static inline snd_pcm_sframes_t
snd_pcm_lib_writev(struct snd_pcm_substream * substream,void __user ** bufs,snd_pcm_uframes_t frames)1090 snd_pcm_lib_writev(struct snd_pcm_substream *substream,
1091 void __user **bufs, snd_pcm_uframes_t frames)
1092 {
1093 return __snd_pcm_lib_xfer(substream, (void *)bufs, false, frames, false);
1094 }
1095
1096 static inline snd_pcm_sframes_t
snd_pcm_lib_readv(struct snd_pcm_substream * substream,void __user ** bufs,snd_pcm_uframes_t frames)1097 snd_pcm_lib_readv(struct snd_pcm_substream *substream,
1098 void __user **bufs, snd_pcm_uframes_t frames)
1099 {
1100 return __snd_pcm_lib_xfer(substream, (void *)bufs, false, frames, false);
1101 }
1102
1103 static inline snd_pcm_sframes_t
snd_pcm_kernel_write(struct snd_pcm_substream * substream,const void * buf,snd_pcm_uframes_t frames)1104 snd_pcm_kernel_write(struct snd_pcm_substream *substream,
1105 const void *buf, snd_pcm_uframes_t frames)
1106 {
1107 return __snd_pcm_lib_xfer(substream, (void *)buf, true, frames, true);
1108 }
1109
1110 static inline snd_pcm_sframes_t
snd_pcm_kernel_read(struct snd_pcm_substream * substream,void * buf,snd_pcm_uframes_t frames)1111 snd_pcm_kernel_read(struct snd_pcm_substream *substream,
1112 void *buf, snd_pcm_uframes_t frames)
1113 {
1114 return __snd_pcm_lib_xfer(substream, buf, true, frames, true);
1115 }
1116
1117 static inline snd_pcm_sframes_t
snd_pcm_kernel_writev(struct snd_pcm_substream * substream,void ** bufs,snd_pcm_uframes_t frames)1118 snd_pcm_kernel_writev(struct snd_pcm_substream *substream,
1119 void **bufs, snd_pcm_uframes_t frames)
1120 {
1121 return __snd_pcm_lib_xfer(substream, bufs, false, frames, true);
1122 }
1123
1124 static inline snd_pcm_sframes_t
snd_pcm_kernel_readv(struct snd_pcm_substream * substream,void ** bufs,snd_pcm_uframes_t frames)1125 snd_pcm_kernel_readv(struct snd_pcm_substream *substream,
1126 void **bufs, snd_pcm_uframes_t frames)
1127 {
1128 return __snd_pcm_lib_xfer(substream, bufs, false, frames, true);
1129 }
1130
1131 int snd_pcm_hw_limit_rates(struct snd_pcm_hardware *hw);
1132
1133 static inline int
snd_pcm_limit_hw_rates(struct snd_pcm_runtime * runtime)1134 snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime)
1135 {
1136 return snd_pcm_hw_limit_rates(&runtime->hw);
1137 }
1138
1139 unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate);
1140 unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit);
1141 unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a,
1142 unsigned int rates_b);
1143 unsigned int snd_pcm_rate_range_to_bits(unsigned int rate_min,
1144 unsigned int rate_max);
1145
1146 /**
1147 * snd_pcm_set_runtime_buffer - Set the PCM runtime buffer
1148 * @substream: PCM substream to set
1149 * @bufp: the buffer information, NULL to clear
1150 *
1151 * Copy the buffer information to runtime->dma_buffer when @bufp is non-NULL.
1152 * Otherwise it clears the current buffer information.
1153 */
snd_pcm_set_runtime_buffer(struct snd_pcm_substream * substream,struct snd_dma_buffer * bufp)1154 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
1155 struct snd_dma_buffer *bufp)
1156 {
1157 struct snd_pcm_runtime *runtime = substream->runtime;
1158 if (bufp) {
1159 runtime->dma_buffer_p = bufp;
1160 runtime->dma_area = bufp->area;
1161 runtime->dma_addr = bufp->addr;
1162 runtime->dma_bytes = bufp->bytes;
1163 } else {
1164 runtime->dma_buffer_p = NULL;
1165 runtime->dma_area = NULL;
1166 runtime->dma_addr = 0;
1167 runtime->dma_bytes = 0;
1168 }
1169 }
1170
1171 /**
1172 * snd_pcm_gettime - Fill the timespec64 depending on the timestamp mode
1173 * @runtime: PCM runtime instance
1174 * @tv: timespec64 to fill
1175 */
snd_pcm_gettime(struct snd_pcm_runtime * runtime,struct timespec64 * tv)1176 static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime,
1177 struct timespec64 *tv)
1178 {
1179 switch (runtime->tstamp_type) {
1180 case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC:
1181 ktime_get_ts64(tv);
1182 break;
1183 case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC_RAW:
1184 ktime_get_raw_ts64(tv);
1185 break;
1186 default:
1187 ktime_get_real_ts64(tv);
1188 break;
1189 }
1190 }
1191
1192 /*
1193 * Memory
1194 */
1195
1196 void snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
1197 void snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
1198 void snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
1199 int type, struct device *data,
1200 size_t size, size_t max);
1201 void snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
1202 int type, void *data,
1203 size_t size, size_t max);
1204 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
1205 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
1206
1207 void snd_pcm_set_managed_buffer(struct snd_pcm_substream *substream, int type,
1208 struct device *data, size_t size, size_t max);
1209 void snd_pcm_set_managed_buffer_all(struct snd_pcm *pcm, int type,
1210 struct device *data,
1211 size_t size, size_t max);
1212
1213 int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream,
1214 size_t size, gfp_t gfp_flags);
1215 int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream);
1216 struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream,
1217 unsigned long offset);
1218 /**
1219 * snd_pcm_lib_alloc_vmalloc_buffer - allocate virtual DMA buffer
1220 * @substream: the substream to allocate the buffer to
1221 * @size: the requested buffer size, in bytes
1222 *
1223 * Allocates the PCM substream buffer using vmalloc(), i.e., the memory is
1224 * contiguous in kernel virtual space, but not in physical memory. Use this
1225 * if the buffer is accessed by kernel code but not by device DMA.
1226 *
1227 * Return: 1 if the buffer was changed, 0 if not changed, or a negative error
1228 * code.
1229 */
snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream * substream,size_t size)1230 static inline int snd_pcm_lib_alloc_vmalloc_buffer
1231 (struct snd_pcm_substream *substream, size_t size)
1232 {
1233 return _snd_pcm_lib_alloc_vmalloc_buffer(substream, size,
1234 GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
1235 }
1236
1237 /**
1238 * snd_pcm_lib_alloc_vmalloc_32_buffer - allocate 32-bit-addressable buffer
1239 * @substream: the substream to allocate the buffer to
1240 * @size: the requested buffer size, in bytes
1241 *
1242 * This function works like snd_pcm_lib_alloc_vmalloc_buffer(), but uses
1243 * vmalloc_32(), i.e., the pages are allocated from 32-bit-addressable memory.
1244 *
1245 * Return: 1 if the buffer was changed, 0 if not changed, or a negative error
1246 * code.
1247 */
snd_pcm_lib_alloc_vmalloc_32_buffer(struct snd_pcm_substream * substream,size_t size)1248 static inline int snd_pcm_lib_alloc_vmalloc_32_buffer
1249 (struct snd_pcm_substream *substream, size_t size)
1250 {
1251 return _snd_pcm_lib_alloc_vmalloc_buffer(substream, size,
1252 GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1253 }
1254
1255 #define snd_pcm_get_dma_buf(substream) ((substream)->runtime->dma_buffer_p)
1256
1257 #ifdef CONFIG_SND_DMA_SGBUF
1258 /*
1259 * SG-buffer handling
1260 */
1261 #define snd_pcm_substream_sgbuf(substream) \
1262 snd_pcm_get_dma_buf(substream)->private_data
1263 #endif /* SND_DMA_SGBUF */
1264
1265 /**
1266 * snd_pcm_sgbuf_get_addr - Get the DMA address at the corresponding offset
1267 * @substream: PCM substream
1268 * @ofs: byte offset
1269 */
1270 static inline dma_addr_t
snd_pcm_sgbuf_get_addr(struct snd_pcm_substream * substream,unsigned int ofs)1271 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
1272 {
1273 return snd_sgbuf_get_addr(snd_pcm_get_dma_buf(substream), ofs);
1274 }
1275
1276 /**
1277 * snd_pcm_sgbuf_get_ptr - Get the virtual address at the corresponding offset
1278 * @substream: PCM substream
1279 * @ofs: byte offset
1280 */
1281 static inline void *
snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream * substream,unsigned int ofs)1282 snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
1283 {
1284 return snd_sgbuf_get_ptr(snd_pcm_get_dma_buf(substream), ofs);
1285 }
1286
1287 /**
1288 * snd_pcm_sgbuf_get_chunk_size - Compute the max size that fits within the
1289 * contig. page from the given size
1290 * @substream: PCM substream
1291 * @ofs: byte offset
1292 * @size: byte size to examine
1293 */
1294 static inline unsigned int
snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream * substream,unsigned int ofs,unsigned int size)1295 snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
1296 unsigned int ofs, unsigned int size)
1297 {
1298 return snd_sgbuf_get_chunk_size(snd_pcm_get_dma_buf(substream), ofs, size);
1299 }
1300
1301 /**
1302 * snd_pcm_mmap_data_open - increase the mmap counter
1303 * @area: VMA
1304 *
1305 * PCM mmap callback should handle this counter properly
1306 */
snd_pcm_mmap_data_open(struct vm_area_struct * area)1307 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
1308 {
1309 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1310 atomic_inc(&substream->mmap_count);
1311 }
1312
1313 /**
1314 * snd_pcm_mmap_data_close - decrease the mmap counter
1315 * @area: VMA
1316 *
1317 * PCM mmap callback should handle this counter properly
1318 */
snd_pcm_mmap_data_close(struct vm_area_struct * area)1319 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
1320 {
1321 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1322 atomic_dec(&substream->mmap_count);
1323 }
1324
1325 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
1326 struct vm_area_struct *area);
1327 /* mmap for io-memory area */
1328 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
1329 #define SNDRV_PCM_INFO_MMAP_IOMEM SNDRV_PCM_INFO_MMAP
1330 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
1331 #else
1332 #define SNDRV_PCM_INFO_MMAP_IOMEM 0
1333 #define snd_pcm_lib_mmap_iomem NULL
1334 #endif
1335
1336 /**
1337 * snd_pcm_limit_isa_dma_size - Get the max size fitting with ISA DMA transfer
1338 * @dma: DMA number
1339 * @max: pointer to store the max size
1340 */
snd_pcm_limit_isa_dma_size(int dma,size_t * max)1341 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
1342 {
1343 *max = dma < 4 ? 64 * 1024 : 128 * 1024;
1344 }
1345
1346 /*
1347 * Misc
1348 */
1349
1350 #define SNDRV_PCM_DEFAULT_CON_SPDIF (IEC958_AES0_CON_EMPHASIS_NONE|\
1351 (IEC958_AES1_CON_ORIGINAL<<8)|\
1352 (IEC958_AES1_CON_PCM_CODER<<8)|\
1353 (IEC958_AES3_CON_FS_48000<<24))
1354
1355 const char *snd_pcm_format_name(snd_pcm_format_t format);
1356
1357 /**
1358 * snd_pcm_stream_str - Get a string naming the direction of a stream
1359 * @substream: the pcm substream instance
1360 *
1361 * Return: A string naming the direction of the stream.
1362 */
snd_pcm_stream_str(struct snd_pcm_substream * substream)1363 static inline const char *snd_pcm_stream_str(struct snd_pcm_substream *substream)
1364 {
1365 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1366 return "Playback";
1367 else
1368 return "Capture";
1369 }
1370
1371 /*
1372 * PCM channel-mapping control API
1373 */
1374 /* array element of channel maps */
1375 struct snd_pcm_chmap_elem {
1376 unsigned char channels;
1377 unsigned char map[15];
1378 };
1379
1380 /* channel map information; retrieved via snd_kcontrol_chip() */
1381 struct snd_pcm_chmap {
1382 struct snd_pcm *pcm; /* assigned PCM instance */
1383 int stream; /* PLAYBACK or CAPTURE */
1384 struct snd_kcontrol *kctl;
1385 const struct snd_pcm_chmap_elem *chmap;
1386 unsigned int max_channels;
1387 unsigned int channel_mask; /* optional: active channels bitmask */
1388 void *private_data; /* optional: private data pointer */
1389 };
1390
1391 /**
1392 * snd_pcm_chmap_substream - get the PCM substream assigned to the given chmap info
1393 * @info: chmap information
1394 * @idx: the substream number index
1395 */
1396 static inline struct snd_pcm_substream *
snd_pcm_chmap_substream(struct snd_pcm_chmap * info,unsigned int idx)1397 snd_pcm_chmap_substream(struct snd_pcm_chmap *info, unsigned int idx)
1398 {
1399 struct snd_pcm_substream *s;
1400 for (s = info->pcm->streams[info->stream].substream; s; s = s->next)
1401 if (s->number == idx)
1402 return s;
1403 return NULL;
1404 }
1405
1406 /* ALSA-standard channel maps (RL/RR prior to C/LFE) */
1407 extern const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[];
1408 /* Other world's standard channel maps (C/LFE prior to RL/RR) */
1409 extern const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[];
1410
1411 /* bit masks to be passed to snd_pcm_chmap.channel_mask field */
1412 #define SND_PCM_CHMAP_MASK_24 ((1U << 2) | (1U << 4))
1413 #define SND_PCM_CHMAP_MASK_246 (SND_PCM_CHMAP_MASK_24 | (1U << 6))
1414 #define SND_PCM_CHMAP_MASK_2468 (SND_PCM_CHMAP_MASK_246 | (1U << 8))
1415
1416 int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
1417 const struct snd_pcm_chmap_elem *chmap,
1418 int max_channels,
1419 unsigned long private_value,
1420 struct snd_pcm_chmap **info_ret);
1421
1422 /**
1423 * pcm_format_to_bits - Strong-typed conversion of pcm_format to bitwise
1424 * @pcm_format: PCM format
1425 */
pcm_format_to_bits(snd_pcm_format_t pcm_format)1426 static inline u64 pcm_format_to_bits(snd_pcm_format_t pcm_format)
1427 {
1428 return 1ULL << (__force int) pcm_format;
1429 }
1430
1431 /**
1432 * pcm_for_each_format - helper to iterate for each format type
1433 * @f: the iterator variable in snd_pcm_format_t type
1434 */
1435 #define pcm_for_each_format(f) \
1436 for ((f) = SNDRV_PCM_FORMAT_FIRST; \
1437 (__force int)(f) <= (__force int)SNDRV_PCM_FORMAT_LAST; \
1438 (f) = (__force snd_pcm_format_t)((__force int)(f) + 1))
1439
1440 /* printk helpers */
1441 #define pcm_err(pcm, fmt, args...) \
1442 dev_err((pcm)->card->dev, fmt, ##args)
1443 #define pcm_warn(pcm, fmt, args...) \
1444 dev_warn((pcm)->card->dev, fmt, ##args)
1445 #define pcm_dbg(pcm, fmt, args...) \
1446 dev_dbg((pcm)->card->dev, fmt, ##args)
1447
1448 struct snd_pcm_status64 {
1449 snd_pcm_state_t state; /* stream state */
1450 u8 rsvd[4];
1451 s64 trigger_tstamp_sec; /* time when stream was started/stopped/paused */
1452 s64 trigger_tstamp_nsec;
1453 s64 tstamp_sec; /* reference timestamp */
1454 s64 tstamp_nsec;
1455 snd_pcm_uframes_t appl_ptr; /* appl ptr */
1456 snd_pcm_uframes_t hw_ptr; /* hw ptr */
1457 snd_pcm_sframes_t delay; /* current delay in frames */
1458 snd_pcm_uframes_t avail; /* number of frames available */
1459 snd_pcm_uframes_t avail_max; /* max frames available on hw since last status */
1460 snd_pcm_uframes_t overrange; /* count of ADC (capture) overrange detections from last status */
1461 snd_pcm_state_t suspended_state; /* suspended stream state */
1462 __u32 audio_tstamp_data; /* needed for 64-bit alignment, used for configs/report to/from userspace */
1463 s64 audio_tstamp_sec; /* sample counter, wall clock, PHC or on-demand sync'ed */
1464 s64 audio_tstamp_nsec;
1465 s64 driver_tstamp_sec; /* useful in case reference system tstamp is reported with delay */
1466 s64 driver_tstamp_nsec;
1467 __u32 audio_tstamp_accuracy; /* in ns units, only valid if indicated in audio_tstamp_data */
1468 unsigned char reserved[52-4*sizeof(s64)]; /* must be filled with zero */
1469 };
1470
1471 #define SNDRV_PCM_IOCTL_STATUS64 _IOR('A', 0x20, struct snd_pcm_status64)
1472 #define SNDRV_PCM_IOCTL_STATUS_EXT64 _IOWR('A', 0x24, struct snd_pcm_status64)
1473
1474 struct snd_pcm_status32 {
1475 snd_pcm_state_t state; /* stream state */
1476 s32 trigger_tstamp_sec; /* time when stream was started/stopped/paused */
1477 s32 trigger_tstamp_nsec;
1478 s32 tstamp_sec; /* reference timestamp */
1479 s32 tstamp_nsec;
1480 u32 appl_ptr; /* appl ptr */
1481 u32 hw_ptr; /* hw ptr */
1482 s32 delay; /* current delay in frames */
1483 u32 avail; /* number of frames available */
1484 u32 avail_max; /* max frames available on hw since last status */
1485 u32 overrange; /* count of ADC (capture) overrange detections from last status */
1486 snd_pcm_state_t suspended_state; /* suspended stream state */
1487 u32 audio_tstamp_data; /* needed for 64-bit alignment, used for configs/report to/from userspace */
1488 s32 audio_tstamp_sec; /* sample counter, wall clock, PHC or on-demand sync'ed */
1489 s32 audio_tstamp_nsec;
1490 s32 driver_tstamp_sec; /* useful in case reference system tstamp is reported with delay */
1491 s32 driver_tstamp_nsec;
1492 u32 audio_tstamp_accuracy; /* in ns units, only valid if indicated in audio_tstamp_data */
1493 unsigned char reserved[52-4*sizeof(s32)]; /* must be filled with zero */
1494 };
1495
1496 #define SNDRV_PCM_IOCTL_STATUS32 _IOR('A', 0x20, struct snd_pcm_status32)
1497 #define SNDRV_PCM_IOCTL_STATUS_EXT32 _IOWR('A', 0x24, struct snd_pcm_status32)
1498
1499 #endif /* __SOUND_PCM_H */
1500