1 /* SPDX-License-Identifier: GPL-2.0-or-later */
6 * Digital Audio (PCM) abstract layer
7 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
8 * Abramo Bagnara <abramo@alsa-project.org>
11 #include <sound/asound.h>
12 #include <sound/memalloc.h>
13 #include <sound/minors.h>
14 #include <linux/poll.h>
16 #include <linux/bitops.h>
17 #include <linux/pm_qos.h>
18 #include <linux/refcount.h>
19 #include <linux/uio.h>
21 #define snd_pcm_substream_chip(substream) ((substream)->private_data)
22 #define snd_pcm_chip(pcm) ((pcm)->private_data)
24 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
25 #include <sound/pcm_oss.h>
29 * Hardware (lowlevel) section
32 struct 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 */
49 struct snd_pcm_status64;
50 struct snd_pcm_substream;
52 struct snd_pcm_audio_tstamp_config; /* definitions further down */
53 struct snd_pcm_audio_tstamp_report;
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);
85 #if defined(CONFIG_SND_DYNAMIC_MINORS)
86 #define SNDRV_PCM_DEVICES (SNDRV_OS_MINORS-2)
88 #define SNDRV_PCM_DEVICES 8
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
97 #define SNDRV_PCM_TRIGGER_STOP 0
98 #define SNDRV_PCM_TRIGGER_START 1
99 #define SNDRV_PCM_TRIGGER_PAUSE_PUSH 3
100 #define SNDRV_PCM_TRIGGER_PAUSE_RELEASE 4
101 #define SNDRV_PCM_TRIGGER_SUSPEND 5
102 #define SNDRV_PCM_TRIGGER_RESUME 6
103 #define SNDRV_PCM_TRIGGER_DRAIN 7
105 #define SNDRV_PCM_POS_XRUN ((snd_pcm_uframes_t)-1)
107 /* If you change this don't forget to change rates[] table in pcm_native.c */
108 #define SNDRV_PCM_RATE_5512 (1U<<0) /* 5512Hz */
109 #define SNDRV_PCM_RATE_8000 (1U<<1) /* 8000Hz */
110 #define SNDRV_PCM_RATE_11025 (1U<<2) /* 11025Hz */
111 #define SNDRV_PCM_RATE_16000 (1U<<3) /* 16000Hz */
112 #define SNDRV_PCM_RATE_22050 (1U<<4) /* 22050Hz */
113 #define SNDRV_PCM_RATE_32000 (1U<<5) /* 32000Hz */
114 #define SNDRV_PCM_RATE_44100 (1U<<6) /* 44100Hz */
115 #define SNDRV_PCM_RATE_48000 (1U<<7) /* 48000Hz */
116 #define SNDRV_PCM_RATE_64000 (1U<<8) /* 64000Hz */
117 #define SNDRV_PCM_RATE_88200 (1U<<9) /* 88200Hz */
118 #define SNDRV_PCM_RATE_96000 (1U<<10) /* 96000Hz */
119 #define SNDRV_PCM_RATE_176400 (1U<<11) /* 176400Hz */
120 #define SNDRV_PCM_RATE_192000 (1U<<12) /* 192000Hz */
121 #define SNDRV_PCM_RATE_352800 (1U<<13) /* 352800Hz */
122 #define SNDRV_PCM_RATE_384000 (1U<<14) /* 384000Hz */
124 #define SNDRV_PCM_RATE_CONTINUOUS (1U<<30) /* continuous range */
125 #define SNDRV_PCM_RATE_KNOT (1U<<31) /* supports more non-continuos rates */
127 #define SNDRV_PCM_RATE_8000_44100 (SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_11025|\
128 SNDRV_PCM_RATE_16000|SNDRV_PCM_RATE_22050|\
129 SNDRV_PCM_RATE_32000|SNDRV_PCM_RATE_44100)
130 #define SNDRV_PCM_RATE_8000_48000 (SNDRV_PCM_RATE_8000_44100|SNDRV_PCM_RATE_48000)
131 #define SNDRV_PCM_RATE_8000_96000 (SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_64000|\
132 SNDRV_PCM_RATE_88200|SNDRV_PCM_RATE_96000)
133 #define SNDRV_PCM_RATE_8000_192000 (SNDRV_PCM_RATE_8000_96000|SNDRV_PCM_RATE_176400|\
134 SNDRV_PCM_RATE_192000)
135 #define SNDRV_PCM_RATE_8000_384000 (SNDRV_PCM_RATE_8000_192000|\
136 SNDRV_PCM_RATE_352800|\
137 SNDRV_PCM_RATE_384000)
138 #define _SNDRV_PCM_FMTBIT(fmt) (1ULL << (__force int)SNDRV_PCM_FORMAT_##fmt)
139 #define SNDRV_PCM_FMTBIT_S8 _SNDRV_PCM_FMTBIT(S8)
140 #define SNDRV_PCM_FMTBIT_U8 _SNDRV_PCM_FMTBIT(U8)
141 #define SNDRV_PCM_FMTBIT_S16_LE _SNDRV_PCM_FMTBIT(S16_LE)
142 #define SNDRV_PCM_FMTBIT_S16_BE _SNDRV_PCM_FMTBIT(S16_BE)
143 #define SNDRV_PCM_FMTBIT_U16_LE _SNDRV_PCM_FMTBIT(U16_LE)
144 #define SNDRV_PCM_FMTBIT_U16_BE _SNDRV_PCM_FMTBIT(U16_BE)
145 #define SNDRV_PCM_FMTBIT_S24_LE _SNDRV_PCM_FMTBIT(S24_LE)
146 #define SNDRV_PCM_FMTBIT_S24_BE _SNDRV_PCM_FMTBIT(S24_BE)
147 #define SNDRV_PCM_FMTBIT_U24_LE _SNDRV_PCM_FMTBIT(U24_LE)
148 #define SNDRV_PCM_FMTBIT_U24_BE _SNDRV_PCM_FMTBIT(U24_BE)
149 // For S32/U32 formats, 'msbits' hardware parameter is often used to deliver information about the
150 // available bit count in most significant bit. It's for the case of so-called 'left-justified' or
151 // `right-padding` sample which has less width than 32 bit.
152 #define SNDRV_PCM_FMTBIT_S32_LE _SNDRV_PCM_FMTBIT(S32_LE)
153 #define SNDRV_PCM_FMTBIT_S32_BE _SNDRV_PCM_FMTBIT(S32_BE)
154 #define SNDRV_PCM_FMTBIT_U32_LE _SNDRV_PCM_FMTBIT(U32_LE)
155 #define SNDRV_PCM_FMTBIT_U32_BE _SNDRV_PCM_FMTBIT(U32_BE)
156 #define SNDRV_PCM_FMTBIT_FLOAT_LE _SNDRV_PCM_FMTBIT(FLOAT_LE)
157 #define SNDRV_PCM_FMTBIT_FLOAT_BE _SNDRV_PCM_FMTBIT(FLOAT_BE)
158 #define SNDRV_PCM_FMTBIT_FLOAT64_LE _SNDRV_PCM_FMTBIT(FLOAT64_LE)
159 #define SNDRV_PCM_FMTBIT_FLOAT64_BE _SNDRV_PCM_FMTBIT(FLOAT64_BE)
160 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_LE)
161 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_BE)
162 #define SNDRV_PCM_FMTBIT_MU_LAW _SNDRV_PCM_FMTBIT(MU_LAW)
163 #define SNDRV_PCM_FMTBIT_A_LAW _SNDRV_PCM_FMTBIT(A_LAW)
164 #define SNDRV_PCM_FMTBIT_IMA_ADPCM _SNDRV_PCM_FMTBIT(IMA_ADPCM)
165 #define SNDRV_PCM_FMTBIT_MPEG _SNDRV_PCM_FMTBIT(MPEG)
166 #define SNDRV_PCM_FMTBIT_GSM _SNDRV_PCM_FMTBIT(GSM)
167 #define SNDRV_PCM_FMTBIT_S20_LE _SNDRV_PCM_FMTBIT(S20_LE)
168 #define SNDRV_PCM_FMTBIT_U20_LE _SNDRV_PCM_FMTBIT(U20_LE)
169 #define SNDRV_PCM_FMTBIT_S20_BE _SNDRV_PCM_FMTBIT(S20_BE)
170 #define SNDRV_PCM_FMTBIT_U20_BE _SNDRV_PCM_FMTBIT(U20_BE)
171 #define SNDRV_PCM_FMTBIT_SPECIAL _SNDRV_PCM_FMTBIT(SPECIAL)
172 #define SNDRV_PCM_FMTBIT_S24_3LE _SNDRV_PCM_FMTBIT(S24_3LE)
173 #define SNDRV_PCM_FMTBIT_U24_3LE _SNDRV_PCM_FMTBIT(U24_3LE)
174 #define SNDRV_PCM_FMTBIT_S24_3BE _SNDRV_PCM_FMTBIT(S24_3BE)
175 #define SNDRV_PCM_FMTBIT_U24_3BE _SNDRV_PCM_FMTBIT(U24_3BE)
176 #define SNDRV_PCM_FMTBIT_S20_3LE _SNDRV_PCM_FMTBIT(S20_3LE)
177 #define SNDRV_PCM_FMTBIT_U20_3LE _SNDRV_PCM_FMTBIT(U20_3LE)
178 #define SNDRV_PCM_FMTBIT_S20_3BE _SNDRV_PCM_FMTBIT(S20_3BE)
179 #define SNDRV_PCM_FMTBIT_U20_3BE _SNDRV_PCM_FMTBIT(U20_3BE)
180 #define SNDRV_PCM_FMTBIT_S18_3LE _SNDRV_PCM_FMTBIT(S18_3LE)
181 #define SNDRV_PCM_FMTBIT_U18_3LE _SNDRV_PCM_FMTBIT(U18_3LE)
182 #define SNDRV_PCM_FMTBIT_S18_3BE _SNDRV_PCM_FMTBIT(S18_3BE)
183 #define SNDRV_PCM_FMTBIT_U18_3BE _SNDRV_PCM_FMTBIT(U18_3BE)
184 #define SNDRV_PCM_FMTBIT_G723_24 _SNDRV_PCM_FMTBIT(G723_24)
185 #define SNDRV_PCM_FMTBIT_G723_24_1B _SNDRV_PCM_FMTBIT(G723_24_1B)
186 #define SNDRV_PCM_FMTBIT_G723_40 _SNDRV_PCM_FMTBIT(G723_40)
187 #define SNDRV_PCM_FMTBIT_G723_40_1B _SNDRV_PCM_FMTBIT(G723_40_1B)
188 #define SNDRV_PCM_FMTBIT_DSD_U8 _SNDRV_PCM_FMTBIT(DSD_U8)
189 #define SNDRV_PCM_FMTBIT_DSD_U16_LE _SNDRV_PCM_FMTBIT(DSD_U16_LE)
190 #define SNDRV_PCM_FMTBIT_DSD_U32_LE _SNDRV_PCM_FMTBIT(DSD_U32_LE)
191 #define SNDRV_PCM_FMTBIT_DSD_U16_BE _SNDRV_PCM_FMTBIT(DSD_U16_BE)
192 #define SNDRV_PCM_FMTBIT_DSD_U32_BE _SNDRV_PCM_FMTBIT(DSD_U32_BE)
194 #ifdef SNDRV_LITTLE_ENDIAN
195 #define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_LE
196 #define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_LE
197 #define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_LE
198 #define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_LE
199 #define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_LE
200 #define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_LE
201 #define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_LE
202 #define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_LE
203 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE
204 #define SNDRV_PCM_FMTBIT_S20 SNDRV_PCM_FMTBIT_S20_LE
205 #define SNDRV_PCM_FMTBIT_U20 SNDRV_PCM_FMTBIT_U20_LE
207 #ifdef SNDRV_BIG_ENDIAN
208 #define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_BE
209 #define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_BE
210 #define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_BE
211 #define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_BE
212 #define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_BE
213 #define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_BE
214 #define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_BE
215 #define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_BE
216 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE
217 #define SNDRV_PCM_FMTBIT_S20 SNDRV_PCM_FMTBIT_S20_BE
218 #define SNDRV_PCM_FMTBIT_U20 SNDRV_PCM_FMTBIT_U20_BE
221 #define _SNDRV_PCM_SUBFMTBIT(fmt) BIT((__force int)SNDRV_PCM_SUBFORMAT_##fmt)
222 #define SNDRV_PCM_SUBFMTBIT_STD _SNDRV_PCM_SUBFMTBIT(STD)
223 #define SNDRV_PCM_SUBFMTBIT_MSBITS_MAX _SNDRV_PCM_SUBFMTBIT(MSBITS_MAX)
224 #define SNDRV_PCM_SUBFMTBIT_MSBITS_20 _SNDRV_PCM_SUBFMTBIT(MSBITS_20)
225 #define SNDRV_PCM_SUBFMTBIT_MSBITS_24 _SNDRV_PCM_SUBFMTBIT(MSBITS_24)
227 struct snd_pcm_file {
228 struct snd_pcm_substream *substream;
230 unsigned int user_pversion; /* supported protocol version */
233 struct snd_pcm_hw_rule;
234 typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params,
235 struct snd_pcm_hw_rule *rule);
237 struct snd_pcm_hw_rule {
242 snd_pcm_hw_rule_func_t func;
246 struct snd_pcm_hw_constraints {
247 struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK -
248 SNDRV_PCM_HW_PARAM_FIRST_MASK + 1];
249 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL -
250 SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
251 unsigned int rules_num;
252 unsigned int rules_all;
253 struct snd_pcm_hw_rule *rules;
256 static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs,
257 snd_pcm_hw_param_t var)
259 return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
262 static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs,
263 snd_pcm_hw_param_t var)
265 return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
270 unsigned int den_min, den_max, den_step;
274 unsigned int num_min, num_max, num_step;
278 struct snd_pcm_hw_constraint_ratnums {
280 const struct snd_ratnum *rats;
283 struct snd_pcm_hw_constraint_ratdens {
285 const struct snd_ratden *rats;
288 struct snd_pcm_hw_constraint_list {
289 const unsigned int *list;
294 struct snd_pcm_hw_constraint_ranges {
296 const struct snd_interval *ranges;
301 * userspace-provided audio timestamp config to kernel,
302 * structure is for internal use only and filled with dedicated unpack routine
304 struct snd_pcm_audio_tstamp_config {
305 /* 5 of max 16 bits used */
306 u32 type_requested:4;
307 u32 report_delay:1; /* add total delay to A/D or D/A */
310 static inline void snd_pcm_unpack_audio_tstamp_config(__u32 data,
311 struct snd_pcm_audio_tstamp_config *config)
313 config->type_requested = data & 0xF;
314 config->report_delay = (data >> 4) & 1;
318 * kernel-provided audio timestamp report to user-space
319 * structure is for internal use only and read by dedicated pack routine
321 struct snd_pcm_audio_tstamp_report {
322 /* 6 of max 16 bits used for bit-fields */
324 /* for backwards compatibility */
327 /* actual type if hardware could not support requested timestamp */
330 /* accuracy represented in ns units */
331 u32 accuracy_report:1; /* 0 if accuracy unknown, 1 if accuracy field is valid */
332 u32 accuracy; /* up to 4.29s, will be packed in separate field */
335 static inline void snd_pcm_pack_audio_tstamp_report(__u32 *data, __u32 *accuracy,
336 const struct snd_pcm_audio_tstamp_report *report)
340 tmp = report->accuracy_report;
342 tmp |= report->actual_type;
344 tmp |= report->valid;
346 *data &= 0xffff; /* zero-clear MSBs */
347 *data |= (tmp << 16);
348 *accuracy = report->accuracy;
352 struct snd_pcm_runtime {
354 snd_pcm_state_t state; /* stream state */
355 snd_pcm_state_t suspended_state; /* suspended stream state */
356 struct snd_pcm_substream *trigger_master;
357 struct timespec64 trigger_tstamp; /* trigger timestamp */
358 bool trigger_tstamp_latched; /* trigger timestamp latched in low-level driver/hardware */
360 snd_pcm_uframes_t avail_max;
361 snd_pcm_uframes_t hw_ptr_base; /* Position at buffer restart */
362 snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time */
363 unsigned long hw_ptr_jiffies; /* Time when hw_ptr is updated */
364 unsigned long hw_ptr_buffer_jiffies; /* buffer time in jiffies */
365 snd_pcm_sframes_t delay; /* extra delay; typically FIFO size */
366 u64 hw_ptr_wrap; /* offset for hw_ptr due to boundary wrap-around */
368 /* -- HW params -- */
369 snd_pcm_access_t access; /* access mode */
370 snd_pcm_format_t format; /* SNDRV_PCM_FORMAT_* */
371 snd_pcm_subformat_t subformat; /* subformat */
372 unsigned int rate; /* rate in Hz */
373 unsigned int channels; /* channels */
374 snd_pcm_uframes_t period_size; /* period size */
375 unsigned int periods; /* periods */
376 snd_pcm_uframes_t buffer_size; /* buffer size */
377 snd_pcm_uframes_t min_align; /* Min alignment for the format */
379 unsigned int frame_bits;
380 unsigned int sample_bits;
382 unsigned int rate_num;
383 unsigned int rate_den;
384 unsigned int no_period_wakeup: 1;
386 /* -- SW params; see struct snd_pcm_sw_params for comments -- */
388 unsigned int period_step;
389 snd_pcm_uframes_t start_threshold;
390 snd_pcm_uframes_t stop_threshold;
391 snd_pcm_uframes_t silence_threshold;
392 snd_pcm_uframes_t silence_size;
393 snd_pcm_uframes_t boundary;
395 /* internal data of auto-silencer */
396 snd_pcm_uframes_t silence_start; /* starting pointer to silence area */
397 snd_pcm_uframes_t silence_filled; /* already filled part of silence area */
399 union snd_pcm_sync_id sync; /* hardware synchronization ID */
402 struct snd_pcm_mmap_status *status;
403 struct snd_pcm_mmap_control *control;
405 /* -- locking / scheduling -- */
406 snd_pcm_uframes_t twake; /* do transfer (!poll) wakeup if non-zero */
407 wait_queue_head_t sleep; /* poll sleep */
408 wait_queue_head_t tsleep; /* transfer sleep */
409 struct snd_fasync *fasync;
410 bool stop_operating; /* sync_stop will be called */
411 struct mutex buffer_mutex; /* protect for buffer changes */
412 atomic_t buffer_accessing; /* >0: in r/w operation, <0: blocked */
414 /* -- private section -- */
416 void (*private_free)(struct snd_pcm_runtime *runtime);
418 /* -- hardware description -- */
419 struct snd_pcm_hardware hw;
420 struct snd_pcm_hw_constraints hw_constraints;
423 unsigned int timer_resolution; /* timer resolution */
424 int tstamp_type; /* timestamp type */
427 unsigned char *dma_area; /* DMA area */
428 dma_addr_t dma_addr; /* physical bus address (not accessible from main CPU) */
429 size_t dma_bytes; /* size of DMA area */
431 struct snd_dma_buffer *dma_buffer_p; /* allocated buffer */
432 unsigned int buffer_changed:1; /* buffer allocation changed; set only in managed mode */
434 /* -- audio timestamp config -- */
435 struct snd_pcm_audio_tstamp_config audio_tstamp_config;
436 struct snd_pcm_audio_tstamp_report audio_tstamp_report;
437 struct timespec64 driver_tstamp;
439 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
440 /* -- OSS things -- */
441 struct snd_pcm_oss_runtime oss;
445 struct snd_pcm_group { /* keep linked substreams */
448 struct list_head substreams;
454 struct snd_pcm_substream {
456 struct snd_pcm_str *pstr;
457 void *private_data; /* copied from pcm->private_data */
459 char name[32]; /* substream name */
460 int stream; /* stream (direction) */
461 struct pm_qos_request latency_pm_qos_req; /* pm_qos request */
462 size_t buffer_bytes_max; /* limit ring buffer size */
463 struct snd_dma_buffer dma_buffer;
465 /* -- hardware operations -- */
466 const struct snd_pcm_ops *ops;
467 /* -- runtime information -- */
468 struct snd_pcm_runtime *runtime;
469 /* -- timer section -- */
470 struct snd_timer *timer; /* timer */
471 unsigned timer_running: 1; /* time is running */
472 long wait_time; /* time in ms for R/W to wait for avail */
473 /* -- next substream -- */
474 struct snd_pcm_substream *next;
475 /* -- linked substreams -- */
476 struct list_head link_list; /* linked list member */
477 struct snd_pcm_group self_group; /* fake group for non linked substream (with substream lock inside) */
478 struct snd_pcm_group *group; /* pointer to current group */
479 /* -- assigned files -- */
482 unsigned int f_flags;
483 void (*pcm_release)(struct snd_pcm_substream *);
485 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
486 /* -- OSS things -- */
487 struct snd_pcm_oss_substream oss;
489 #ifdef CONFIG_SND_VERBOSE_PROCFS
490 struct snd_info_entry *proc_root;
491 #endif /* CONFIG_SND_VERBOSE_PROCFS */
493 unsigned int hw_opened: 1;
494 unsigned int managed_buffer_alloc:1;
497 #define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0)
501 int stream; /* stream (direction) */
503 /* -- substreams -- */
504 unsigned int substream_count;
505 unsigned int substream_opened;
506 struct snd_pcm_substream *substream;
507 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
508 /* -- OSS things -- */
509 struct snd_pcm_oss_stream oss;
511 #ifdef CONFIG_SND_VERBOSE_PROCFS
512 struct snd_info_entry *proc_root;
513 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
514 unsigned int xrun_debug; /* 0 = disabled, 1 = verbose, 2 = stacktrace */
517 struct snd_kcontrol *chmap_kctl; /* channel-mapping controls */
522 struct snd_card *card;
523 struct list_head list;
524 int device; /* device number */
525 unsigned int info_flags;
526 unsigned short dev_class;
527 unsigned short dev_subclass;
530 struct snd_pcm_str streams[2];
531 struct mutex open_mutex;
532 wait_queue_head_t open_wait;
534 void (*private_free) (struct snd_pcm *pcm);
535 bool internal; /* pcm is for internal use only */
536 bool nonatomic; /* whole PCM operations are in non-atomic context */
537 bool no_device_suspend; /* don't invoke device PM suspend */
538 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
539 struct snd_pcm_oss oss;
547 extern const struct file_operations snd_pcm_f_ops[2];
549 int snd_pcm_new(struct snd_card *card, const char *id, int device,
550 int playback_count, int capture_count,
551 struct snd_pcm **rpcm);
552 int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
553 int playback_count, int capture_count,
554 struct snd_pcm **rpcm);
555 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
557 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
558 struct snd_pcm_notify {
559 int (*n_register) (struct snd_pcm * pcm);
560 int (*n_disconnect) (struct snd_pcm * pcm);
561 int (*n_unregister) (struct snd_pcm * pcm);
562 struct list_head list;
564 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
571 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
572 int snd_pcm_info_user(struct snd_pcm_substream *substream,
573 struct snd_pcm_info __user *info);
574 int snd_pcm_status64(struct snd_pcm_substream *substream,
575 struct snd_pcm_status64 *status);
576 int snd_pcm_start(struct snd_pcm_substream *substream);
577 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t status);
578 int snd_pcm_drain_done(struct snd_pcm_substream *substream);
579 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream);
581 int snd_pcm_suspend_all(struct snd_pcm *pcm);
583 static inline int snd_pcm_suspend_all(struct snd_pcm *pcm)
588 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
589 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
590 struct snd_pcm_substream **rsubstream);
591 void snd_pcm_release_substream(struct snd_pcm_substream *substream);
592 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
593 struct snd_pcm_substream **rsubstream);
594 void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
595 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
598 #ifdef CONFIG_SND_DEBUG
599 void snd_pcm_debug_name(struct snd_pcm_substream *substream,
600 char *name, size_t len);
603 snd_pcm_debug_name(struct snd_pcm_substream *substream, char *buf, size_t size)
614 * snd_pcm_stream_linked - Check whether the substream is linked with others
615 * @substream: substream to check
617 * Return: true if the given substream is being linked with others
619 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
621 return substream->group != &substream->self_group;
624 void snd_pcm_stream_lock(struct snd_pcm_substream *substream);
625 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream);
626 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream);
627 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream);
628 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream);
629 unsigned long _snd_pcm_stream_lock_irqsave_nested(struct snd_pcm_substream *substream);
632 * snd_pcm_stream_lock_irqsave - Lock the PCM stream
633 * @substream: PCM substream
636 * This locks the PCM stream like snd_pcm_stream_lock() but with the local
637 * IRQ (only when nonatomic is false). In nonatomic case, this is identical
638 * as snd_pcm_stream_lock().
640 #define snd_pcm_stream_lock_irqsave(substream, flags) \
642 typecheck(unsigned long, flags); \
643 flags = _snd_pcm_stream_lock_irqsave(substream); \
645 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
646 unsigned long flags);
649 * snd_pcm_stream_lock_irqsave_nested - Single-nested PCM stream locking
650 * @substream: PCM substream
653 * This locks the PCM stream like snd_pcm_stream_lock_irqsave() but with
654 * the single-depth lockdep subclass.
656 #define snd_pcm_stream_lock_irqsave_nested(substream, flags) \
658 typecheck(unsigned long, flags); \
659 flags = _snd_pcm_stream_lock_irqsave_nested(substream); \
662 /* definitions for guard(); use like guard(pcm_stream_lock) */
663 DEFINE_LOCK_GUARD_1(pcm_stream_lock, struct snd_pcm_substream,
664 snd_pcm_stream_lock(_T->lock),
665 snd_pcm_stream_unlock(_T->lock))
666 DEFINE_LOCK_GUARD_1(pcm_stream_lock_irq, struct snd_pcm_substream,
667 snd_pcm_stream_lock_irq(_T->lock),
668 snd_pcm_stream_unlock_irq(_T->lock))
669 DEFINE_LOCK_GUARD_1(pcm_stream_lock_irqsave, struct snd_pcm_substream,
670 snd_pcm_stream_lock_irqsave(_T->lock, _T->flags),
671 snd_pcm_stream_unlock_irqrestore(_T->lock, _T->flags),
675 * snd_pcm_group_for_each_entry - iterate over the linked substreams
677 * @substream: the substream
679 * Iterate over the all linked substreams to the given @substream.
680 * When @substream isn't linked with any others, this gives returns @substream
683 #define snd_pcm_group_for_each_entry(s, substream) \
684 list_for_each_entry(s, &substream->group->substreams, link_list)
686 #define for_each_pcm_streams(stream) \
687 for (stream = SNDRV_PCM_STREAM_PLAYBACK; \
688 stream <= SNDRV_PCM_STREAM_LAST; \
692 * snd_pcm_running - Check whether the substream is in a running state
693 * @substream: substream to check
695 * Return: true if the given substream is in the state RUNNING, or in the
696 * state DRAINING for playback.
698 static inline int snd_pcm_running(struct snd_pcm_substream *substream)
700 return (substream->runtime->state == SNDRV_PCM_STATE_RUNNING ||
701 (substream->runtime->state == SNDRV_PCM_STATE_DRAINING &&
702 substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
706 * __snd_pcm_set_state - Change the current PCM state
707 * @runtime: PCM runtime to set
708 * @state: the current state to set
710 * Call within the stream lock
712 static inline void __snd_pcm_set_state(struct snd_pcm_runtime *runtime,
713 snd_pcm_state_t state)
715 runtime->state = state;
716 runtime->status->state = state; /* copy for mmap */
720 * bytes_to_samples - Unit conversion of the size from bytes to samples
721 * @runtime: PCM runtime instance
722 * @size: size in bytes
724 * Return: the size in samples
726 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
728 return size * 8 / runtime->sample_bits;
732 * bytes_to_frames - Unit conversion of the size from bytes to frames
733 * @runtime: PCM runtime instance
734 * @size: size in bytes
736 * Return: the size in frames
738 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
740 return size * 8 / runtime->frame_bits;
744 * samples_to_bytes - Unit conversion of the size from samples to bytes
745 * @runtime: PCM runtime instance
746 * @size: size in samples
748 * Return: the byte size
750 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
752 return size * runtime->sample_bits / 8;
756 * frames_to_bytes - Unit conversion of the size from frames to bytes
757 * @runtime: PCM runtime instance
758 * @size: size in frames
760 * Return: the byte size
762 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
764 return size * runtime->frame_bits / 8;
768 * frame_aligned - Check whether the byte size is aligned to frames
769 * @runtime: PCM runtime instance
770 * @bytes: size in bytes
772 * Return: true if aligned, or false if not
774 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
776 return bytes % runtime->byte_align == 0;
780 * snd_pcm_lib_buffer_bytes - Get the buffer size of the current PCM in bytes
781 * @substream: PCM substream
783 * Return: buffer byte size
785 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
787 struct snd_pcm_runtime *runtime = substream->runtime;
788 return frames_to_bytes(runtime, runtime->buffer_size);
792 * snd_pcm_lib_period_bytes - Get the period size of the current PCM in bytes
793 * @substream: PCM substream
795 * Return: period byte size
797 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
799 struct snd_pcm_runtime *runtime = substream->runtime;
800 return frames_to_bytes(runtime, runtime->period_size);
804 * snd_pcm_playback_avail - Get the available (writable) space for playback
805 * @runtime: PCM runtime instance
807 * Result is between 0 ... (boundary - 1)
809 * Return: available frame size
811 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
813 snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
815 avail += runtime->boundary;
816 else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
817 avail -= runtime->boundary;
822 * snd_pcm_capture_avail - Get the available (readable) space for capture
823 * @runtime: PCM runtime instance
825 * Result is between 0 ... (boundary - 1)
827 * Return: available frame size
829 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
831 snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
833 avail += runtime->boundary;
838 * snd_pcm_playback_hw_avail - Get the queued space for playback
839 * @runtime: PCM runtime instance
841 * Return: available frame size
843 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
845 return runtime->buffer_size - snd_pcm_playback_avail(runtime);
849 * snd_pcm_capture_hw_avail - Get the free space for capture
850 * @runtime: PCM runtime instance
852 * Return: available frame size
854 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
856 return runtime->buffer_size - snd_pcm_capture_avail(runtime);
860 * snd_pcm_playback_ready - check whether the playback buffer is available
861 * @substream: the pcm substream instance
863 * Checks whether enough free space is available on the playback buffer.
865 * Return: Non-zero if available, or zero if not.
867 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
869 struct snd_pcm_runtime *runtime = substream->runtime;
870 return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
874 * snd_pcm_capture_ready - check whether the capture buffer is available
875 * @substream: the pcm substream instance
877 * Checks whether enough capture data is available on the capture buffer.
879 * Return: Non-zero if available, or zero if not.
881 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
883 struct snd_pcm_runtime *runtime = substream->runtime;
884 return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
888 * snd_pcm_playback_data - check whether any data exists on the playback buffer
889 * @substream: the pcm substream instance
891 * Checks whether any data exists on the playback buffer.
893 * Return: Non-zero if any data exists, or zero if not. If stop_threshold
894 * is bigger or equal to boundary, then this function returns always non-zero.
896 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
898 struct snd_pcm_runtime *runtime = substream->runtime;
900 if (runtime->stop_threshold >= runtime->boundary)
902 return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
906 * snd_pcm_playback_empty - check whether the playback buffer is empty
907 * @substream: the pcm substream instance
909 * Checks whether the playback buffer is empty.
911 * Return: Non-zero if empty, or zero if not.
913 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
915 struct snd_pcm_runtime *runtime = substream->runtime;
916 return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
920 * snd_pcm_capture_empty - check whether the capture buffer is empty
921 * @substream: the pcm substream instance
923 * Checks whether the capture buffer is empty.
925 * Return: Non-zero if empty, or zero if not.
927 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
929 struct snd_pcm_runtime *runtime = substream->runtime;
930 return snd_pcm_capture_avail(runtime) == 0;
934 * snd_pcm_trigger_done - Mark the master substream
935 * @substream: the pcm substream instance
936 * @master: the linked master substream
938 * When multiple substreams of the same card are linked and the hardware
939 * supports the single-shot operation, the driver calls this in the loop
940 * in snd_pcm_group_for_each_entry() for marking the substream as "done".
941 * Then most of trigger operations are performed only to the given master
944 * The trigger_master mark is cleared at timestamp updates at the end
945 * of trigger operations.
947 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream,
948 struct snd_pcm_substream *master)
950 substream->runtime->trigger_master = master;
953 static inline int hw_is_mask(int var)
955 return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
956 var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
959 static inline int hw_is_interval(int var)
961 return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
962 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
965 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
966 snd_pcm_hw_param_t var)
968 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
971 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
972 snd_pcm_hw_param_t var)
974 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
977 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
978 snd_pcm_hw_param_t var)
980 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
983 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
984 snd_pcm_hw_param_t var)
986 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
990 * params_channels - Get the number of channels from the hw params
993 * Return: the number of channels
995 static inline unsigned int params_channels(const struct snd_pcm_hw_params *p)
997 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_CHANNELS)->min;
1001 * params_rate - Get the sample rate from the hw params
1004 * Return: the sample rate
1006 static inline unsigned int params_rate(const struct snd_pcm_hw_params *p)
1008 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_RATE)->min;
1012 * params_period_size - Get the period size (in frames) from the hw params
1015 * Return: the period size in frames
1017 static inline unsigned int params_period_size(const struct snd_pcm_hw_params *p)
1019 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min;
1023 * params_periods - Get the number of periods from the hw params
1026 * Return: the number of periods
1028 static inline unsigned int params_periods(const struct snd_pcm_hw_params *p)
1030 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIODS)->min;
1034 * params_buffer_size - Get the buffer size (in frames) from the hw params
1037 * Return: the buffer size in frames
1039 static inline unsigned int params_buffer_size(const struct snd_pcm_hw_params *p)
1041 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min;
1045 * params_buffer_bytes - Get the buffer size (in bytes) from the hw params
1048 * Return: the buffer size in bytes
1050 static inline unsigned int params_buffer_bytes(const struct snd_pcm_hw_params *p)
1052 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min;
1055 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
1056 int snd_interval_list(struct snd_interval *i, unsigned int count,
1057 const unsigned int *list, unsigned int mask);
1058 int snd_interval_ranges(struct snd_interval *i, unsigned int count,
1059 const struct snd_interval *list, unsigned int mask);
1060 int snd_interval_ratnum(struct snd_interval *i,
1061 unsigned int rats_count, const struct snd_ratnum *rats,
1062 unsigned int *nump, unsigned int *denp);
1064 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
1065 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
1067 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
1069 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1071 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1072 unsigned int min, unsigned int max);
1073 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
1074 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
1076 snd_pcm_hw_param_t var,
1077 const struct snd_pcm_hw_constraint_list *l);
1078 int snd_pcm_hw_constraint_ranges(struct snd_pcm_runtime *runtime,
1080 snd_pcm_hw_param_t var,
1081 const struct snd_pcm_hw_constraint_ranges *r);
1082 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
1084 snd_pcm_hw_param_t var,
1085 const struct snd_pcm_hw_constraint_ratnums *r);
1086 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1088 snd_pcm_hw_param_t var,
1089 const struct snd_pcm_hw_constraint_ratdens *r);
1090 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1093 unsigned int msbits);
1094 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1096 snd_pcm_hw_param_t var,
1097 unsigned long step);
1098 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1100 snd_pcm_hw_param_t var);
1101 int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
1102 unsigned int base_rate);
1103 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
1106 snd_pcm_hw_rule_func_t func, void *private,
1110 * snd_pcm_hw_constraint_single() - Constrain parameter to a single value
1111 * @runtime: PCM runtime instance
1112 * @var: The hw_params variable to constrain
1113 * @val: The value to constrain to
1115 * Return: Positive if the value is changed, zero if it's not changed, or a
1116 * negative error code.
1118 static inline int snd_pcm_hw_constraint_single(
1119 struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1122 return snd_pcm_hw_constraint_minmax(runtime, var, val, val);
1125 int snd_pcm_format_signed(snd_pcm_format_t format);
1126 int snd_pcm_format_unsigned(snd_pcm_format_t format);
1127 int snd_pcm_format_linear(snd_pcm_format_t format);
1128 int snd_pcm_format_little_endian(snd_pcm_format_t format);
1129 int snd_pcm_format_big_endian(snd_pcm_format_t format);
1130 #if 0 /* just for kernel-doc */
1132 * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
1133 * @format: the format to check
1135 * Return: 1 if the given PCM format is CPU-endian, 0 if
1136 * opposite, or a negative error code if endian not specified.
1138 int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
1139 #endif /* DocBook */
1140 #ifdef SNDRV_LITTLE_ENDIAN
1141 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
1143 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
1145 int snd_pcm_format_width(snd_pcm_format_t format); /* in bits */
1146 int snd_pcm_format_physical_width(snd_pcm_format_t format); /* in bits */
1147 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
1148 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
1149 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
1151 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction,
1152 const struct snd_pcm_ops *ops);
1153 void snd_pcm_set_sync(struct snd_pcm_substream *substream);
1154 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1155 unsigned int cmd, void *arg);
1156 void snd_pcm_period_elapsed_under_stream_lock(struct snd_pcm_substream *substream);
1157 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
1158 snd_pcm_sframes_t __snd_pcm_lib_xfer(struct snd_pcm_substream *substream,
1159 void *buf, bool interleaved,
1160 snd_pcm_uframes_t frames, bool in_kernel);
1162 static inline snd_pcm_sframes_t
1163 snd_pcm_lib_write(struct snd_pcm_substream *substream,
1164 const void __user *buf, snd_pcm_uframes_t frames)
1166 return __snd_pcm_lib_xfer(substream, (void __force *)buf, true, frames, false);
1169 static inline snd_pcm_sframes_t
1170 snd_pcm_lib_read(struct snd_pcm_substream *substream,
1171 void __user *buf, snd_pcm_uframes_t frames)
1173 return __snd_pcm_lib_xfer(substream, (void __force *)buf, true, frames, false);
1176 static inline snd_pcm_sframes_t
1177 snd_pcm_lib_writev(struct snd_pcm_substream *substream,
1178 void __user **bufs, snd_pcm_uframes_t frames)
1180 return __snd_pcm_lib_xfer(substream, (void *)bufs, false, frames, false);
1183 static inline snd_pcm_sframes_t
1184 snd_pcm_lib_readv(struct snd_pcm_substream *substream,
1185 void __user **bufs, snd_pcm_uframes_t frames)
1187 return __snd_pcm_lib_xfer(substream, (void *)bufs, false, frames, false);
1190 static inline snd_pcm_sframes_t
1191 snd_pcm_kernel_write(struct snd_pcm_substream *substream,
1192 const void *buf, snd_pcm_uframes_t frames)
1194 return __snd_pcm_lib_xfer(substream, (void *)buf, true, frames, true);
1197 static inline snd_pcm_sframes_t
1198 snd_pcm_kernel_read(struct snd_pcm_substream *substream,
1199 void *buf, snd_pcm_uframes_t frames)
1201 return __snd_pcm_lib_xfer(substream, buf, true, frames, true);
1204 static inline snd_pcm_sframes_t
1205 snd_pcm_kernel_writev(struct snd_pcm_substream *substream,
1206 void **bufs, snd_pcm_uframes_t frames)
1208 return __snd_pcm_lib_xfer(substream, bufs, false, frames, true);
1211 static inline snd_pcm_sframes_t
1212 snd_pcm_kernel_readv(struct snd_pcm_substream *substream,
1213 void **bufs, snd_pcm_uframes_t frames)
1215 return __snd_pcm_lib_xfer(substream, bufs, false, frames, true);
1218 int snd_pcm_hw_limit_rates(struct snd_pcm_hardware *hw);
1221 snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime)
1223 return snd_pcm_hw_limit_rates(&runtime->hw);
1226 unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate);
1227 unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit);
1228 unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a,
1229 unsigned int rates_b);
1230 unsigned int snd_pcm_rate_range_to_bits(unsigned int rate_min,
1231 unsigned int rate_max);
1234 * snd_pcm_set_runtime_buffer - Set the PCM runtime buffer
1235 * @substream: PCM substream to set
1236 * @bufp: the buffer information, NULL to clear
1238 * Copy the buffer information to runtime->dma_buffer when @bufp is non-NULL.
1239 * Otherwise it clears the current buffer information.
1241 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
1242 struct snd_dma_buffer *bufp)
1244 struct snd_pcm_runtime *runtime = substream->runtime;
1246 runtime->dma_buffer_p = bufp;
1247 runtime->dma_area = bufp->area;
1248 runtime->dma_addr = bufp->addr;
1249 runtime->dma_bytes = bufp->bytes;
1251 runtime->dma_buffer_p = NULL;
1252 runtime->dma_area = NULL;
1253 runtime->dma_addr = 0;
1254 runtime->dma_bytes = 0;
1259 * snd_pcm_gettime - Fill the timespec64 depending on the timestamp mode
1260 * @runtime: PCM runtime instance
1261 * @tv: timespec64 to fill
1263 static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime,
1264 struct timespec64 *tv)
1266 switch (runtime->tstamp_type) {
1267 case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC:
1270 case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC_RAW:
1271 ktime_get_raw_ts64(tv);
1274 ktime_get_real_ts64(tv);
1283 void snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
1284 void snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
1285 void snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
1286 int type, struct device *data,
1287 size_t size, size_t max);
1288 void snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
1289 int type, void *data,
1290 size_t size, size_t max);
1291 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
1292 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
1294 int snd_pcm_set_managed_buffer(struct snd_pcm_substream *substream, int type,
1295 struct device *data, size_t size, size_t max);
1296 int snd_pcm_set_managed_buffer_all(struct snd_pcm *pcm, int type,
1297 struct device *data,
1298 size_t size, size_t max);
1301 * snd_pcm_set_fixed_buffer - Preallocate and set up the fixed size PCM buffer
1302 * @substream: the pcm substream instance
1303 * @type: DMA type (SNDRV_DMA_TYPE_*)
1304 * @data: DMA type dependent data
1305 * @size: the requested pre-allocation size in bytes
1307 * This is a variant of snd_pcm_set_managed_buffer(), but this pre-allocates
1308 * only the given sized buffer and doesn't allow re-allocation nor dynamic
1309 * allocation of a larger buffer unlike the standard one.
1310 * The function may return -ENOMEM error, hence the caller must check it.
1312 * Return: zero if successful, or a negative error code
1314 static inline int __must_check
1315 snd_pcm_set_fixed_buffer(struct snd_pcm_substream *substream, int type,
1316 struct device *data, size_t size)
1318 return snd_pcm_set_managed_buffer(substream, type, data, size, 0);
1322 * snd_pcm_set_fixed_buffer_all - Preallocate and set up the fixed size PCM buffer
1323 * @pcm: the pcm instance
1324 * @type: DMA type (SNDRV_DMA_TYPE_*)
1325 * @data: DMA type dependent data
1326 * @size: the requested pre-allocation size in bytes
1328 * Apply the set up of the fixed buffer via snd_pcm_set_fixed_buffer() for
1329 * all substream. If any of allocation fails, it returns -ENOMEM, hence the
1330 * caller must check the return value.
1332 * Return: zero if successful, or a negative error code
1334 static inline int __must_check
1335 snd_pcm_set_fixed_buffer_all(struct snd_pcm *pcm, int type,
1336 struct device *data, size_t size)
1338 return snd_pcm_set_managed_buffer_all(pcm, type, data, size, 0);
1341 int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream,
1342 size_t size, gfp_t gfp_flags);
1343 int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream);
1344 struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream,
1345 unsigned long offset);
1347 * snd_pcm_lib_alloc_vmalloc_buffer - allocate virtual DMA buffer
1348 * @substream: the substream to allocate the buffer to
1349 * @size: the requested buffer size, in bytes
1351 * Allocates the PCM substream buffer using vmalloc(), i.e., the memory is
1352 * contiguous in kernel virtual space, but not in physical memory. Use this
1353 * if the buffer is accessed by kernel code but not by device DMA.
1355 * Return: 1 if the buffer was changed, 0 if not changed, or a negative error
1358 static inline int snd_pcm_lib_alloc_vmalloc_buffer
1359 (struct snd_pcm_substream *substream, size_t size)
1361 return _snd_pcm_lib_alloc_vmalloc_buffer(substream, size,
1362 GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
1366 * snd_pcm_lib_alloc_vmalloc_32_buffer - allocate 32-bit-addressable buffer
1367 * @substream: the substream to allocate the buffer to
1368 * @size: the requested buffer size, in bytes
1370 * This function works like snd_pcm_lib_alloc_vmalloc_buffer(), but uses
1371 * vmalloc_32(), i.e., the pages are allocated from 32-bit-addressable memory.
1373 * Return: 1 if the buffer was changed, 0 if not changed, or a negative error
1376 static inline int snd_pcm_lib_alloc_vmalloc_32_buffer
1377 (struct snd_pcm_substream *substream, size_t size)
1379 return _snd_pcm_lib_alloc_vmalloc_buffer(substream, size,
1380 GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1383 #define snd_pcm_get_dma_buf(substream) ((substream)->runtime->dma_buffer_p)
1386 * snd_pcm_sgbuf_get_addr - Get the DMA address at the corresponding offset
1387 * @substream: PCM substream
1390 * Return: DMA address
1392 static inline dma_addr_t
1393 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
1395 return snd_sgbuf_get_addr(snd_pcm_get_dma_buf(substream), ofs);
1399 * snd_pcm_sgbuf_get_chunk_size - Compute the max size that fits within the
1400 * contig. page from the given size
1401 * @substream: PCM substream
1403 * @size: byte size to examine
1405 * Return: chunk size
1407 static inline unsigned int
1408 snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
1409 unsigned int ofs, unsigned int size)
1411 return snd_sgbuf_get_chunk_size(snd_pcm_get_dma_buf(substream), ofs, size);
1415 * snd_pcm_mmap_data_open - increase the mmap counter
1418 * PCM mmap callback should handle this counter properly
1420 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
1422 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1423 atomic_inc(&substream->mmap_count);
1427 * snd_pcm_mmap_data_close - decrease the mmap counter
1430 * PCM mmap callback should handle this counter properly
1432 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
1434 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1435 atomic_dec(&substream->mmap_count);
1438 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
1439 struct vm_area_struct *area);
1440 /* mmap for io-memory area */
1441 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
1442 #define SNDRV_PCM_INFO_MMAP_IOMEM SNDRV_PCM_INFO_MMAP
1443 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
1445 #define SNDRV_PCM_INFO_MMAP_IOMEM 0
1446 #define snd_pcm_lib_mmap_iomem NULL
1450 * snd_pcm_limit_isa_dma_size - Get the max size fitting with ISA DMA transfer
1452 * @max: pointer to store the max size
1454 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
1456 *max = dma < 4 ? 64 * 1024 : 128 * 1024;
1463 #define SNDRV_PCM_DEFAULT_CON_SPDIF (IEC958_AES0_CON_EMPHASIS_NONE|\
1464 (IEC958_AES1_CON_ORIGINAL<<8)|\
1465 (IEC958_AES1_CON_PCM_CODER<<8)|\
1466 (IEC958_AES3_CON_FS_48000<<24))
1468 const char *snd_pcm_format_name(snd_pcm_format_t format);
1471 * snd_pcm_direction_name - Get a string naming the direction of a stream
1472 * @direction: Stream's direction, one of SNDRV_PCM_STREAM_XXX
1474 * Returns a string naming the direction of the stream.
1476 static inline const char *snd_pcm_direction_name(int direction)
1478 if (direction == SNDRV_PCM_STREAM_PLAYBACK)
1485 * snd_pcm_stream_str - Get a string naming the direction of a stream
1486 * @substream: the pcm substream instance
1488 * Return: A string naming the direction of the stream.
1490 static inline const char *snd_pcm_stream_str(struct snd_pcm_substream *substream)
1492 return snd_pcm_direction_name(substream->stream);
1496 * PCM channel-mapping control API
1498 /* array element of channel maps */
1499 struct snd_pcm_chmap_elem {
1500 unsigned char channels;
1501 unsigned char map[15];
1504 /* channel map information; retrieved via snd_kcontrol_chip() */
1505 struct snd_pcm_chmap {
1506 struct snd_pcm *pcm; /* assigned PCM instance */
1507 int stream; /* PLAYBACK or CAPTURE */
1508 struct snd_kcontrol *kctl;
1509 const struct snd_pcm_chmap_elem *chmap;
1510 unsigned int max_channels;
1511 unsigned int channel_mask; /* optional: active channels bitmask */
1512 void *private_data; /* optional: private data pointer */
1516 * snd_pcm_chmap_substream - get the PCM substream assigned to the given chmap info
1517 * @info: chmap information
1518 * @idx: the substream number index
1520 * Return: the matched PCM substream, or NULL if not found
1522 static inline struct snd_pcm_substream *
1523 snd_pcm_chmap_substream(struct snd_pcm_chmap *info, unsigned int idx)
1525 struct snd_pcm_substream *s;
1526 for (s = info->pcm->streams[info->stream].substream; s; s = s->next)
1527 if (s->number == idx)
1532 /* ALSA-standard channel maps (RL/RR prior to C/LFE) */
1533 extern const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[];
1534 /* Other world's standard channel maps (C/LFE prior to RL/RR) */
1535 extern const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[];
1537 /* bit masks to be passed to snd_pcm_chmap.channel_mask field */
1538 #define SND_PCM_CHMAP_MASK_24 ((1U << 2) | (1U << 4))
1539 #define SND_PCM_CHMAP_MASK_246 (SND_PCM_CHMAP_MASK_24 | (1U << 6))
1540 #define SND_PCM_CHMAP_MASK_2468 (SND_PCM_CHMAP_MASK_246 | (1U << 8))
1542 int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
1543 const struct snd_pcm_chmap_elem *chmap,
1545 unsigned long private_value,
1546 struct snd_pcm_chmap **info_ret);
1549 * pcm_format_to_bits - Strong-typed conversion of pcm_format to bitwise
1550 * @pcm_format: PCM format
1552 * Return: 64bit mask corresponding to the given PCM format
1554 static inline u64 pcm_format_to_bits(snd_pcm_format_t pcm_format)
1556 return 1ULL << (__force int) pcm_format;
1560 * pcm_for_each_format - helper to iterate for each format type
1561 * @f: the iterator variable in snd_pcm_format_t type
1563 #define pcm_for_each_format(f) \
1564 for ((f) = SNDRV_PCM_FORMAT_FIRST; \
1565 (__force int)(f) <= (__force int)SNDRV_PCM_FORMAT_LAST; \
1566 (f) = (__force snd_pcm_format_t)((__force int)(f) + 1))
1568 /* printk helpers */
1569 #define pcm_err(pcm, fmt, args...) \
1570 dev_err((pcm)->card->dev, fmt, ##args)
1571 #define pcm_warn(pcm, fmt, args...) \
1572 dev_warn((pcm)->card->dev, fmt, ##args)
1573 #define pcm_dbg(pcm, fmt, args...) \
1574 dev_dbg((pcm)->card->dev, fmt, ##args)
1576 /* helpers for copying between iov_iter and iomem */
1577 int copy_to_iter_fromio(struct iov_iter *itert, const void __iomem *src,
1579 int copy_from_iter_toio(void __iomem *dst, struct iov_iter *iter, size_t count);
1581 struct snd_pcm_status64 {
1582 snd_pcm_state_t state; /* stream state */
1584 s64 trigger_tstamp_sec; /* time when stream was started/stopped/paused */
1585 s64 trigger_tstamp_nsec;
1586 s64 tstamp_sec; /* reference timestamp */
1588 snd_pcm_uframes_t appl_ptr; /* appl ptr */
1589 snd_pcm_uframes_t hw_ptr; /* hw ptr */
1590 snd_pcm_sframes_t delay; /* current delay in frames */
1591 snd_pcm_uframes_t avail; /* number of frames available */
1592 snd_pcm_uframes_t avail_max; /* max frames available on hw since last status */
1593 snd_pcm_uframes_t overrange; /* count of ADC (capture) overrange detections from last status */
1594 snd_pcm_state_t suspended_state; /* suspended stream state */
1595 __u32 audio_tstamp_data; /* needed for 64-bit alignment, used for configs/report to/from userspace */
1596 s64 audio_tstamp_sec; /* sample counter, wall clock, PHC or on-demand sync'ed */
1597 s64 audio_tstamp_nsec;
1598 s64 driver_tstamp_sec; /* useful in case reference system tstamp is reported with delay */
1599 s64 driver_tstamp_nsec;
1600 __u32 audio_tstamp_accuracy; /* in ns units, only valid if indicated in audio_tstamp_data */
1601 unsigned char reserved[52-4*sizeof(s64)]; /* must be filled with zero */
1604 #define SNDRV_PCM_IOCTL_STATUS64 _IOR('A', 0x20, struct snd_pcm_status64)
1605 #define SNDRV_PCM_IOCTL_STATUS_EXT64 _IOWR('A', 0x24, struct snd_pcm_status64)
1607 struct snd_pcm_status32 {
1608 snd_pcm_state_t state; /* stream state */
1609 s32 trigger_tstamp_sec; /* time when stream was started/stopped/paused */
1610 s32 trigger_tstamp_nsec;
1611 s32 tstamp_sec; /* reference timestamp */
1613 u32 appl_ptr; /* appl ptr */
1614 u32 hw_ptr; /* hw ptr */
1615 s32 delay; /* current delay in frames */
1616 u32 avail; /* number of frames available */
1617 u32 avail_max; /* max frames available on hw since last status */
1618 u32 overrange; /* count of ADC (capture) overrange detections from last status */
1619 snd_pcm_state_t suspended_state; /* suspended stream state */
1620 u32 audio_tstamp_data; /* needed for 64-bit alignment, used for configs/report to/from userspace */
1621 s32 audio_tstamp_sec; /* sample counter, wall clock, PHC or on-demand sync'ed */
1622 s32 audio_tstamp_nsec;
1623 s32 driver_tstamp_sec; /* useful in case reference system tstamp is reported with delay */
1624 s32 driver_tstamp_nsec;
1625 u32 audio_tstamp_accuracy; /* in ns units, only valid if indicated in audio_tstamp_data */
1626 unsigned char reserved[52-4*sizeof(s32)]; /* must be filled with zero */
1629 #define SNDRV_PCM_IOCTL_STATUS32 _IOR('A', 0x20, struct snd_pcm_status32)
1630 #define SNDRV_PCM_IOCTL_STATUS_EXT32 _IOWR('A', 0x24, struct snd_pcm_status32)
1632 #endif /* __SOUND_PCM_H */