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>
20 #define snd_pcm_substream_chip(substream) ((substream)->private_data)
21 #define snd_pcm_chip(pcm) ((pcm)->private_data)
23 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
24 #include <sound/pcm_oss.h>
28 * Hardware (lowlevel) section
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 */
47 struct snd_pcm_status64;
48 struct snd_pcm_substream;
50 struct snd_pcm_audio_tstamp_config; /* definitions further down */
51 struct snd_pcm_audio_tstamp_report;
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,
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);
86 #if defined(CONFIG_SND_DYNAMIC_MINORS)
87 #define SNDRV_PCM_DEVICES (SNDRV_OS_MINORS-2)
89 #define SNDRV_PCM_DEVICES 8
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
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
106 #define SNDRV_PCM_POS_XRUN ((snd_pcm_uframes_t)-1)
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 */
125 #define SNDRV_PCM_RATE_CONTINUOUS (1<<30) /* continuous range */
126 #define SNDRV_PCM_RATE_KNOT (1<<31) /* supports more non-continuos rates */
128 #define SNDRV_PCM_RATE_8000_44100 (SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_11025|\
129 SNDRV_PCM_RATE_16000|SNDRV_PCM_RATE_22050|\
130 SNDRV_PCM_RATE_32000|SNDRV_PCM_RATE_44100)
131 #define SNDRV_PCM_RATE_8000_48000 (SNDRV_PCM_RATE_8000_44100|SNDRV_PCM_RATE_48000)
132 #define SNDRV_PCM_RATE_8000_96000 (SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_64000|\
133 SNDRV_PCM_RATE_88200|SNDRV_PCM_RATE_96000)
134 #define SNDRV_PCM_RATE_8000_192000 (SNDRV_PCM_RATE_8000_96000|SNDRV_PCM_RATE_176400|\
135 SNDRV_PCM_RATE_192000)
136 #define SNDRV_PCM_RATE_8000_384000 (SNDRV_PCM_RATE_8000_192000|\
137 SNDRV_PCM_RATE_352800|\
138 SNDRV_PCM_RATE_384000)
139 #define _SNDRV_PCM_FMTBIT(fmt) (1ULL << (__force int)SNDRV_PCM_FORMAT_##fmt)
140 #define SNDRV_PCM_FMTBIT_S8 _SNDRV_PCM_FMTBIT(S8)
141 #define SNDRV_PCM_FMTBIT_U8 _SNDRV_PCM_FMTBIT(U8)
142 #define SNDRV_PCM_FMTBIT_S16_LE _SNDRV_PCM_FMTBIT(S16_LE)
143 #define SNDRV_PCM_FMTBIT_S16_BE _SNDRV_PCM_FMTBIT(S16_BE)
144 #define SNDRV_PCM_FMTBIT_U16_LE _SNDRV_PCM_FMTBIT(U16_LE)
145 #define SNDRV_PCM_FMTBIT_U16_BE _SNDRV_PCM_FMTBIT(U16_BE)
146 #define SNDRV_PCM_FMTBIT_S24_LE _SNDRV_PCM_FMTBIT(S24_LE)
147 #define SNDRV_PCM_FMTBIT_S24_BE _SNDRV_PCM_FMTBIT(S24_BE)
148 #define SNDRV_PCM_FMTBIT_U24_LE _SNDRV_PCM_FMTBIT(U24_LE)
149 #define SNDRV_PCM_FMTBIT_U24_BE _SNDRV_PCM_FMTBIT(U24_BE)
150 // For S32/U32 formats, 'msbits' hardware parameter is often used to deliver information about the
151 // available bit count in most significant bit. It's for the case of so-called 'left-justified' or
152 // `right-padding` sample which has less width than 32 bit.
153 #define SNDRV_PCM_FMTBIT_S32_LE _SNDRV_PCM_FMTBIT(S32_LE)
154 #define SNDRV_PCM_FMTBIT_S32_BE _SNDRV_PCM_FMTBIT(S32_BE)
155 #define SNDRV_PCM_FMTBIT_U32_LE _SNDRV_PCM_FMTBIT(U32_LE)
156 #define SNDRV_PCM_FMTBIT_U32_BE _SNDRV_PCM_FMTBIT(U32_BE)
157 #define SNDRV_PCM_FMTBIT_FLOAT_LE _SNDRV_PCM_FMTBIT(FLOAT_LE)
158 #define SNDRV_PCM_FMTBIT_FLOAT_BE _SNDRV_PCM_FMTBIT(FLOAT_BE)
159 #define SNDRV_PCM_FMTBIT_FLOAT64_LE _SNDRV_PCM_FMTBIT(FLOAT64_LE)
160 #define SNDRV_PCM_FMTBIT_FLOAT64_BE _SNDRV_PCM_FMTBIT(FLOAT64_BE)
161 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_LE)
162 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_BE)
163 #define SNDRV_PCM_FMTBIT_MU_LAW _SNDRV_PCM_FMTBIT(MU_LAW)
164 #define SNDRV_PCM_FMTBIT_A_LAW _SNDRV_PCM_FMTBIT(A_LAW)
165 #define SNDRV_PCM_FMTBIT_IMA_ADPCM _SNDRV_PCM_FMTBIT(IMA_ADPCM)
166 #define SNDRV_PCM_FMTBIT_MPEG _SNDRV_PCM_FMTBIT(MPEG)
167 #define SNDRV_PCM_FMTBIT_GSM _SNDRV_PCM_FMTBIT(GSM)
168 #define SNDRV_PCM_FMTBIT_S20_LE _SNDRV_PCM_FMTBIT(S20_LE)
169 #define SNDRV_PCM_FMTBIT_U20_LE _SNDRV_PCM_FMTBIT(U20_LE)
170 #define SNDRV_PCM_FMTBIT_S20_BE _SNDRV_PCM_FMTBIT(S20_BE)
171 #define SNDRV_PCM_FMTBIT_U20_BE _SNDRV_PCM_FMTBIT(U20_BE)
172 #define SNDRV_PCM_FMTBIT_SPECIAL _SNDRV_PCM_FMTBIT(SPECIAL)
173 #define SNDRV_PCM_FMTBIT_S24_3LE _SNDRV_PCM_FMTBIT(S24_3LE)
174 #define SNDRV_PCM_FMTBIT_U24_3LE _SNDRV_PCM_FMTBIT(U24_3LE)
175 #define SNDRV_PCM_FMTBIT_S24_3BE _SNDRV_PCM_FMTBIT(S24_3BE)
176 #define SNDRV_PCM_FMTBIT_U24_3BE _SNDRV_PCM_FMTBIT(U24_3BE)
177 #define SNDRV_PCM_FMTBIT_S20_3LE _SNDRV_PCM_FMTBIT(S20_3LE)
178 #define SNDRV_PCM_FMTBIT_U20_3LE _SNDRV_PCM_FMTBIT(U20_3LE)
179 #define SNDRV_PCM_FMTBIT_S20_3BE _SNDRV_PCM_FMTBIT(S20_3BE)
180 #define SNDRV_PCM_FMTBIT_U20_3BE _SNDRV_PCM_FMTBIT(U20_3BE)
181 #define SNDRV_PCM_FMTBIT_S18_3LE _SNDRV_PCM_FMTBIT(S18_3LE)
182 #define SNDRV_PCM_FMTBIT_U18_3LE _SNDRV_PCM_FMTBIT(U18_3LE)
183 #define SNDRV_PCM_FMTBIT_S18_3BE _SNDRV_PCM_FMTBIT(S18_3BE)
184 #define SNDRV_PCM_FMTBIT_U18_3BE _SNDRV_PCM_FMTBIT(U18_3BE)
185 #define SNDRV_PCM_FMTBIT_G723_24 _SNDRV_PCM_FMTBIT(G723_24)
186 #define SNDRV_PCM_FMTBIT_G723_24_1B _SNDRV_PCM_FMTBIT(G723_24_1B)
187 #define SNDRV_PCM_FMTBIT_G723_40 _SNDRV_PCM_FMTBIT(G723_40)
188 #define SNDRV_PCM_FMTBIT_G723_40_1B _SNDRV_PCM_FMTBIT(G723_40_1B)
189 #define SNDRV_PCM_FMTBIT_DSD_U8 _SNDRV_PCM_FMTBIT(DSD_U8)
190 #define SNDRV_PCM_FMTBIT_DSD_U16_LE _SNDRV_PCM_FMTBIT(DSD_U16_LE)
191 #define SNDRV_PCM_FMTBIT_DSD_U32_LE _SNDRV_PCM_FMTBIT(DSD_U32_LE)
192 #define SNDRV_PCM_FMTBIT_DSD_U16_BE _SNDRV_PCM_FMTBIT(DSD_U16_BE)
193 #define SNDRV_PCM_FMTBIT_DSD_U32_BE _SNDRV_PCM_FMTBIT(DSD_U32_BE)
195 #ifdef SNDRV_LITTLE_ENDIAN
196 #define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_LE
197 #define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_LE
198 #define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_LE
199 #define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_LE
200 #define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_LE
201 #define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_LE
202 #define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_LE
203 #define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_LE
204 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE
205 #define SNDRV_PCM_FMTBIT_S20 SNDRV_PCM_FMTBIT_S20_LE
206 #define SNDRV_PCM_FMTBIT_U20 SNDRV_PCM_FMTBIT_U20_LE
208 #ifdef SNDRV_BIG_ENDIAN
209 #define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_BE
210 #define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_BE
211 #define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_BE
212 #define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_BE
213 #define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_BE
214 #define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_BE
215 #define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_BE
216 #define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_BE
217 #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE
218 #define SNDRV_PCM_FMTBIT_S20 SNDRV_PCM_FMTBIT_S20_BE
219 #define SNDRV_PCM_FMTBIT_U20 SNDRV_PCM_FMTBIT_U20_BE
222 struct snd_pcm_file {
223 struct snd_pcm_substream *substream;
225 unsigned int user_pversion; /* supported protocol version */
228 struct snd_pcm_hw_rule;
229 typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params,
230 struct snd_pcm_hw_rule *rule);
232 struct snd_pcm_hw_rule {
237 snd_pcm_hw_rule_func_t func;
241 struct snd_pcm_hw_constraints {
242 struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK -
243 SNDRV_PCM_HW_PARAM_FIRST_MASK + 1];
244 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL -
245 SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1];
246 unsigned int rules_num;
247 unsigned int rules_all;
248 struct snd_pcm_hw_rule *rules;
251 static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs,
252 snd_pcm_hw_param_t var)
254 return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
257 static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs,
258 snd_pcm_hw_param_t var)
260 return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
265 unsigned int den_min, den_max, den_step;
269 unsigned int num_min, num_max, num_step;
273 struct snd_pcm_hw_constraint_ratnums {
275 const struct snd_ratnum *rats;
278 struct snd_pcm_hw_constraint_ratdens {
280 const struct snd_ratden *rats;
283 struct snd_pcm_hw_constraint_list {
284 const unsigned int *list;
289 struct snd_pcm_hw_constraint_ranges {
291 const struct snd_interval *ranges;
296 * userspace-provided audio timestamp config to kernel,
297 * structure is for internal use only and filled with dedicated unpack routine
299 struct snd_pcm_audio_tstamp_config {
300 /* 5 of max 16 bits used */
301 u32 type_requested:4;
302 u32 report_delay:1; /* add total delay to A/D or D/A */
305 static inline void snd_pcm_unpack_audio_tstamp_config(__u32 data,
306 struct snd_pcm_audio_tstamp_config *config)
308 config->type_requested = data & 0xF;
309 config->report_delay = (data >> 4) & 1;
313 * kernel-provided audio timestamp report to user-space
314 * structure is for internal use only and read by dedicated pack routine
316 struct snd_pcm_audio_tstamp_report {
317 /* 6 of max 16 bits used for bit-fields */
319 /* for backwards compatibility */
322 /* actual type if hardware could not support requested timestamp */
325 /* accuracy represented in ns units */
326 u32 accuracy_report:1; /* 0 if accuracy unknown, 1 if accuracy field is valid */
327 u32 accuracy; /* up to 4.29s, will be packed in separate field */
330 static inline void snd_pcm_pack_audio_tstamp_report(__u32 *data, __u32 *accuracy,
331 const struct snd_pcm_audio_tstamp_report *report)
335 tmp = report->accuracy_report;
337 tmp |= report->actual_type;
339 tmp |= report->valid;
341 *data &= 0xffff; /* zero-clear MSBs */
342 *data |= (tmp << 16);
343 *accuracy = report->accuracy;
347 struct snd_pcm_runtime {
349 struct snd_pcm_substream *trigger_master;
350 struct timespec64 trigger_tstamp; /* trigger timestamp */
351 bool trigger_tstamp_latched; /* trigger timestamp latched in low-level driver/hardware */
353 snd_pcm_uframes_t avail_max;
354 snd_pcm_uframes_t hw_ptr_base; /* Position at buffer restart */
355 snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time */
356 unsigned long hw_ptr_jiffies; /* Time when hw_ptr is updated */
357 unsigned long hw_ptr_buffer_jiffies; /* buffer time in jiffies */
358 snd_pcm_sframes_t delay; /* extra delay; typically FIFO size */
359 u64 hw_ptr_wrap; /* offset for hw_ptr due to boundary wrap-around */
361 /* -- HW params -- */
362 snd_pcm_access_t access; /* access mode */
363 snd_pcm_format_t format; /* SNDRV_PCM_FORMAT_* */
364 snd_pcm_subformat_t subformat; /* subformat */
365 unsigned int rate; /* rate in Hz */
366 unsigned int channels; /* channels */
367 snd_pcm_uframes_t period_size; /* period size */
368 unsigned int periods; /* periods */
369 snd_pcm_uframes_t buffer_size; /* buffer size */
370 snd_pcm_uframes_t min_align; /* Min alignment for the format */
372 unsigned int frame_bits;
373 unsigned int sample_bits;
375 unsigned int rate_num;
376 unsigned int rate_den;
377 unsigned int no_period_wakeup: 1;
379 /* -- SW params -- */
380 int tstamp_mode; /* mmap timestamp is updated */
381 unsigned int period_step;
382 snd_pcm_uframes_t start_threshold;
383 snd_pcm_uframes_t stop_threshold;
384 snd_pcm_uframes_t silence_threshold; /* Silence filling happens when
385 noise is nearest than this */
386 snd_pcm_uframes_t silence_size; /* Silence filling size */
387 snd_pcm_uframes_t boundary; /* pointers wrap point */
389 snd_pcm_uframes_t silence_start; /* starting pointer to silence area */
390 snd_pcm_uframes_t silence_filled; /* size filled with silence */
392 union snd_pcm_sync_id sync; /* hardware synchronization ID */
395 struct snd_pcm_mmap_status *status;
396 struct snd_pcm_mmap_control *control;
398 /* -- locking / scheduling -- */
399 snd_pcm_uframes_t twake; /* do transfer (!poll) wakeup if non-zero */
400 wait_queue_head_t sleep; /* poll sleep */
401 wait_queue_head_t tsleep; /* transfer sleep */
402 struct fasync_struct *fasync;
403 bool stop_operating; /* sync_stop will be called */
405 /* -- private section -- */
407 void (*private_free)(struct snd_pcm_runtime *runtime);
409 /* -- hardware description -- */
410 struct snd_pcm_hardware hw;
411 struct snd_pcm_hw_constraints hw_constraints;
414 unsigned int timer_resolution; /* timer resolution */
415 int tstamp_type; /* timestamp type */
418 unsigned char *dma_area; /* DMA area */
419 dma_addr_t dma_addr; /* physical bus address (not accessible from main CPU) */
420 size_t dma_bytes; /* size of DMA area */
422 struct snd_dma_buffer *dma_buffer_p; /* allocated buffer */
423 unsigned int buffer_changed:1; /* buffer allocation changed; set only in managed mode */
425 /* -- audio timestamp config -- */
426 struct snd_pcm_audio_tstamp_config audio_tstamp_config;
427 struct snd_pcm_audio_tstamp_report audio_tstamp_report;
428 struct timespec64 driver_tstamp;
430 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
431 /* -- OSS things -- */
432 struct snd_pcm_oss_runtime oss;
436 struct snd_pcm_group { /* keep linked substreams */
439 struct list_head substreams;
445 struct snd_pcm_substream {
447 struct snd_pcm_str *pstr;
448 void *private_data; /* copied from pcm->private_data */
450 char name[32]; /* substream name */
451 int stream; /* stream (direction) */
452 struct pm_qos_request latency_pm_qos_req; /* pm_qos request */
453 size_t buffer_bytes_max; /* limit ring buffer size */
454 struct snd_dma_buffer dma_buffer;
456 /* -- hardware operations -- */
457 const struct snd_pcm_ops *ops;
458 /* -- runtime information -- */
459 struct snd_pcm_runtime *runtime;
460 /* -- timer section -- */
461 struct snd_timer *timer; /* timer */
462 unsigned timer_running: 1; /* time is running */
463 long wait_time; /* time in ms for R/W to wait for avail */
464 /* -- next substream -- */
465 struct snd_pcm_substream *next;
466 /* -- linked substreams -- */
467 struct list_head link_list; /* linked list member */
468 struct snd_pcm_group self_group; /* fake group for non linked substream (with substream lock inside) */
469 struct snd_pcm_group *group; /* pointer to current group */
470 /* -- assigned files -- */
473 unsigned int f_flags;
474 void (*pcm_release)(struct snd_pcm_substream *);
476 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
477 /* -- OSS things -- */
478 struct snd_pcm_oss_substream oss;
480 #ifdef CONFIG_SND_VERBOSE_PROCFS
481 struct snd_info_entry *proc_root;
482 #endif /* CONFIG_SND_VERBOSE_PROCFS */
484 unsigned int hw_opened: 1;
485 unsigned int managed_buffer_alloc:1;
488 #define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0)
492 int stream; /* stream (direction) */
494 /* -- substreams -- */
495 unsigned int substream_count;
496 unsigned int substream_opened;
497 struct snd_pcm_substream *substream;
498 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
499 /* -- OSS things -- */
500 struct snd_pcm_oss_stream oss;
502 #ifdef CONFIG_SND_VERBOSE_PROCFS
503 struct snd_info_entry *proc_root;
504 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
505 unsigned int xrun_debug; /* 0 = disabled, 1 = verbose, 2 = stacktrace */
508 struct snd_kcontrol *chmap_kctl; /* channel-mapping controls */
513 struct snd_card *card;
514 struct list_head list;
515 int device; /* device number */
516 unsigned int info_flags;
517 unsigned short dev_class;
518 unsigned short dev_subclass;
521 struct snd_pcm_str streams[2];
522 struct mutex open_mutex;
523 wait_queue_head_t open_wait;
525 void (*private_free) (struct snd_pcm *pcm);
526 bool internal; /* pcm is for internal use only */
527 bool nonatomic; /* whole PCM operations are in non-atomic context */
528 bool no_device_suspend; /* don't invoke device PM suspend */
529 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
530 struct snd_pcm_oss oss;
538 extern const struct file_operations snd_pcm_f_ops[2];
540 int snd_pcm_new(struct snd_card *card, const char *id, int device,
541 int playback_count, int capture_count,
542 struct snd_pcm **rpcm);
543 int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
544 int playback_count, int capture_count,
545 struct snd_pcm **rpcm);
546 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
548 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
549 struct snd_pcm_notify {
550 int (*n_register) (struct snd_pcm * pcm);
551 int (*n_disconnect) (struct snd_pcm * pcm);
552 int (*n_unregister) (struct snd_pcm * pcm);
553 struct list_head list;
555 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
562 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
563 int snd_pcm_info_user(struct snd_pcm_substream *substream,
564 struct snd_pcm_info __user *info);
565 int snd_pcm_status64(struct snd_pcm_substream *substream,
566 struct snd_pcm_status64 *status);
567 int snd_pcm_start(struct snd_pcm_substream *substream);
568 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t status);
569 int snd_pcm_drain_done(struct snd_pcm_substream *substream);
570 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream);
572 int snd_pcm_suspend_all(struct snd_pcm *pcm);
574 static inline int snd_pcm_suspend_all(struct snd_pcm *pcm)
579 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
580 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
581 struct snd_pcm_substream **rsubstream);
582 void snd_pcm_release_substream(struct snd_pcm_substream *substream);
583 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
584 struct snd_pcm_substream **rsubstream);
585 void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
586 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
589 #ifdef CONFIG_SND_DEBUG
590 void snd_pcm_debug_name(struct snd_pcm_substream *substream,
591 char *name, size_t len);
594 snd_pcm_debug_name(struct snd_pcm_substream *substream, char *buf, size_t size)
605 * snd_pcm_stream_linked - Check whether the substream is linked with others
606 * @substream: substream to check
608 * Returns true if the given substream is being linked with others.
610 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
612 return substream->group != &substream->self_group;
615 void snd_pcm_stream_lock(struct snd_pcm_substream *substream);
616 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream);
617 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream);
618 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream);
619 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream);
620 unsigned long _snd_pcm_stream_lock_irqsave_nested(struct snd_pcm_substream *substream);
623 * snd_pcm_stream_lock_irqsave - Lock the PCM stream
624 * @substream: PCM substream
627 * This locks the PCM stream like snd_pcm_stream_lock() but with the local
628 * IRQ (only when nonatomic is false). In nonatomic case, this is identical
629 * as snd_pcm_stream_lock().
631 #define snd_pcm_stream_lock_irqsave(substream, flags) \
633 typecheck(unsigned long, flags); \
634 flags = _snd_pcm_stream_lock_irqsave(substream); \
636 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
637 unsigned long flags);
640 * snd_pcm_stream_lock_irqsave_nested - Single-nested PCM stream locking
641 * @substream: PCM substream
644 * This locks the PCM stream like snd_pcm_stream_lock_irqsave() but with
645 * the single-depth lockdep subclass.
647 #define snd_pcm_stream_lock_irqsave_nested(substream, flags) \
649 typecheck(unsigned long, flags); \
650 flags = _snd_pcm_stream_lock_irqsave_nested(substream); \
654 * snd_pcm_group_for_each_entry - iterate over the linked substreams
656 * @substream: the substream
658 * Iterate over the all linked substreams to the given @substream.
659 * When @substream isn't linked with any others, this gives returns @substream
662 #define snd_pcm_group_for_each_entry(s, substream) \
663 list_for_each_entry(s, &substream->group->substreams, link_list)
665 #define for_each_pcm_streams(stream) \
666 for (stream = SNDRV_PCM_STREAM_PLAYBACK; \
667 stream <= SNDRV_PCM_STREAM_LAST; \
671 * snd_pcm_running - Check whether the substream is in a running state
672 * @substream: substream to check
674 * Returns true if the given substream is in the state RUNNING, or in the
675 * state DRAINING for playback.
677 static inline int snd_pcm_running(struct snd_pcm_substream *substream)
679 return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
680 (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING &&
681 substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
685 * bytes_to_samples - Unit conversion of the size from bytes to samples
686 * @runtime: PCM runtime instance
687 * @size: size in bytes
689 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
691 return size * 8 / runtime->sample_bits;
695 * bytes_to_frames - Unit conversion of the size from bytes to frames
696 * @runtime: PCM runtime instance
697 * @size: size in bytes
699 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
701 return size * 8 / runtime->frame_bits;
705 * samples_to_bytes - Unit conversion of the size from samples to bytes
706 * @runtime: PCM runtime instance
707 * @size: size in samples
709 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
711 return size * runtime->sample_bits / 8;
715 * frames_to_bytes - Unit conversion of the size from frames to bytes
716 * @runtime: PCM runtime instance
717 * @size: size in frames
719 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
721 return size * runtime->frame_bits / 8;
725 * frame_aligned - Check whether the byte size is aligned to frames
726 * @runtime: PCM runtime instance
727 * @bytes: size in bytes
729 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
731 return bytes % runtime->byte_align == 0;
735 * snd_pcm_lib_buffer_bytes - Get the buffer size of the current PCM in bytes
736 * @substream: PCM substream
738 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
740 struct snd_pcm_runtime *runtime = substream->runtime;
741 return frames_to_bytes(runtime, runtime->buffer_size);
745 * snd_pcm_lib_period_bytes - Get the period size of the current PCM in bytes
746 * @substream: PCM substream
748 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
750 struct snd_pcm_runtime *runtime = substream->runtime;
751 return frames_to_bytes(runtime, runtime->period_size);
755 * snd_pcm_playback_avail - Get the available (writable) space for playback
756 * @runtime: PCM runtime instance
758 * Result is between 0 ... (boundary - 1)
760 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
762 snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
764 avail += runtime->boundary;
765 else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
766 avail -= runtime->boundary;
771 * snd_pcm_capture_avail - Get the available (readable) space for capture
772 * @runtime: PCM runtime instance
774 * Result is between 0 ... (boundary - 1)
776 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
778 snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
780 avail += runtime->boundary;
785 * snd_pcm_playback_hw_avail - Get the queued space for playback
786 * @runtime: PCM runtime instance
788 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
790 return runtime->buffer_size - snd_pcm_playback_avail(runtime);
794 * snd_pcm_capture_hw_avail - Get the free space for capture
795 * @runtime: PCM runtime instance
797 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
799 return runtime->buffer_size - snd_pcm_capture_avail(runtime);
803 * snd_pcm_playback_ready - check whether the playback buffer is available
804 * @substream: the pcm substream instance
806 * Checks whether enough free space is available on the playback buffer.
808 * Return: Non-zero if available, or zero if not.
810 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
812 struct snd_pcm_runtime *runtime = substream->runtime;
813 return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
817 * snd_pcm_capture_ready - check whether the capture buffer is available
818 * @substream: the pcm substream instance
820 * Checks whether enough capture data is available on the capture buffer.
822 * Return: Non-zero if available, or zero if not.
824 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
826 struct snd_pcm_runtime *runtime = substream->runtime;
827 return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
831 * snd_pcm_playback_data - check whether any data exists on the playback buffer
832 * @substream: the pcm substream instance
834 * Checks whether any data exists on the playback buffer.
836 * Return: Non-zero if any data exists, or zero if not. If stop_threshold
837 * is bigger or equal to boundary, then this function returns always non-zero.
839 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
841 struct snd_pcm_runtime *runtime = substream->runtime;
843 if (runtime->stop_threshold >= runtime->boundary)
845 return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
849 * snd_pcm_playback_empty - check whether the playback buffer is empty
850 * @substream: the pcm substream instance
852 * Checks whether the playback buffer is empty.
854 * Return: Non-zero if empty, or zero if not.
856 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
858 struct snd_pcm_runtime *runtime = substream->runtime;
859 return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
863 * snd_pcm_capture_empty - check whether the capture buffer is empty
864 * @substream: the pcm substream instance
866 * Checks whether the capture buffer is empty.
868 * Return: Non-zero if empty, or zero if not.
870 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
872 struct snd_pcm_runtime *runtime = substream->runtime;
873 return snd_pcm_capture_avail(runtime) == 0;
877 * snd_pcm_trigger_done - Mark the master substream
878 * @substream: the pcm substream instance
879 * @master: the linked master substream
881 * When multiple substreams of the same card are linked and the hardware
882 * supports the single-shot operation, the driver calls this in the loop
883 * in snd_pcm_group_for_each_entry() for marking the substream as "done".
884 * Then most of trigger operations are performed only to the given master
887 * The trigger_master mark is cleared at timestamp updates at the end
888 * of trigger operations.
890 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream,
891 struct snd_pcm_substream *master)
893 substream->runtime->trigger_master = master;
896 static inline int hw_is_mask(int var)
898 return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
899 var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
902 static inline int hw_is_interval(int var)
904 return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
905 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
908 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
909 snd_pcm_hw_param_t var)
911 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
914 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
915 snd_pcm_hw_param_t var)
917 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
920 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
921 snd_pcm_hw_param_t var)
923 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
926 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
927 snd_pcm_hw_param_t var)
929 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
933 * params_channels - Get the number of channels from the hw params
936 static inline unsigned int params_channels(const struct snd_pcm_hw_params *p)
938 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_CHANNELS)->min;
942 * params_rate - Get the sample rate from the hw params
945 static inline unsigned int params_rate(const struct snd_pcm_hw_params *p)
947 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_RATE)->min;
951 * params_period_size - Get the period size (in frames) from the hw params
954 static inline unsigned int params_period_size(const struct snd_pcm_hw_params *p)
956 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min;
960 * params_periods - Get the number of periods from the hw params
963 static inline unsigned int params_periods(const struct snd_pcm_hw_params *p)
965 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIODS)->min;
969 * params_buffer_size - Get the buffer size (in frames) from the hw params
972 static inline unsigned int params_buffer_size(const struct snd_pcm_hw_params *p)
974 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min;
978 * params_buffer_bytes - Get the buffer size (in bytes) from the hw params
981 static inline unsigned int params_buffer_bytes(const struct snd_pcm_hw_params *p)
983 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min;
986 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
987 int snd_interval_list(struct snd_interval *i, unsigned int count,
988 const unsigned int *list, unsigned int mask);
989 int snd_interval_ranges(struct snd_interval *i, unsigned int count,
990 const struct snd_interval *list, unsigned int mask);
991 int snd_interval_ratnum(struct snd_interval *i,
992 unsigned int rats_count, const struct snd_ratnum *rats,
993 unsigned int *nump, unsigned int *denp);
995 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
996 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
998 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
1000 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1002 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1003 unsigned int min, unsigned int max);
1004 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
1005 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
1007 snd_pcm_hw_param_t var,
1008 const struct snd_pcm_hw_constraint_list *l);
1009 int snd_pcm_hw_constraint_ranges(struct snd_pcm_runtime *runtime,
1011 snd_pcm_hw_param_t var,
1012 const struct snd_pcm_hw_constraint_ranges *r);
1013 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
1015 snd_pcm_hw_param_t var,
1016 const struct snd_pcm_hw_constraint_ratnums *r);
1017 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1019 snd_pcm_hw_param_t var,
1020 const struct snd_pcm_hw_constraint_ratdens *r);
1021 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1024 unsigned int msbits);
1025 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1027 snd_pcm_hw_param_t var,
1028 unsigned long step);
1029 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1031 snd_pcm_hw_param_t var);
1032 int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
1033 unsigned int base_rate);
1034 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
1037 snd_pcm_hw_rule_func_t func, void *private,
1041 * snd_pcm_hw_constraint_single() - Constrain parameter to a single value
1042 * @runtime: PCM runtime instance
1043 * @var: The hw_params variable to constrain
1044 * @val: The value to constrain to
1046 * Return: Positive if the value is changed, zero if it's not changed, or a
1047 * negative error code.
1049 static inline int snd_pcm_hw_constraint_single(
1050 struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1053 return snd_pcm_hw_constraint_minmax(runtime, var, val, val);
1056 int snd_pcm_format_signed(snd_pcm_format_t format);
1057 int snd_pcm_format_unsigned(snd_pcm_format_t format);
1058 int snd_pcm_format_linear(snd_pcm_format_t format);
1059 int snd_pcm_format_little_endian(snd_pcm_format_t format);
1060 int snd_pcm_format_big_endian(snd_pcm_format_t format);
1061 #if 0 /* just for kernel-doc */
1063 * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
1064 * @format: the format to check
1066 * Return: 1 if the given PCM format is CPU-endian, 0 if
1067 * opposite, or a negative error code if endian not specified.
1069 int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
1070 #endif /* DocBook */
1071 #ifdef SNDRV_LITTLE_ENDIAN
1072 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
1074 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
1076 int snd_pcm_format_width(snd_pcm_format_t format); /* in bits */
1077 int snd_pcm_format_physical_width(snd_pcm_format_t format); /* in bits */
1078 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
1079 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
1080 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
1082 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction,
1083 const struct snd_pcm_ops *ops);
1084 void snd_pcm_set_sync(struct snd_pcm_substream *substream);
1085 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1086 unsigned int cmd, void *arg);
1087 void snd_pcm_period_elapsed_under_stream_lock(struct snd_pcm_substream *substream);
1088 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
1089 snd_pcm_sframes_t __snd_pcm_lib_xfer(struct snd_pcm_substream *substream,
1090 void *buf, bool interleaved,
1091 snd_pcm_uframes_t frames, bool in_kernel);
1093 static inline snd_pcm_sframes_t
1094 snd_pcm_lib_write(struct snd_pcm_substream *substream,
1095 const void __user *buf, snd_pcm_uframes_t frames)
1097 return __snd_pcm_lib_xfer(substream, (void __force *)buf, true, frames, false);
1100 static inline snd_pcm_sframes_t
1101 snd_pcm_lib_read(struct snd_pcm_substream *substream,
1102 void __user *buf, snd_pcm_uframes_t frames)
1104 return __snd_pcm_lib_xfer(substream, (void __force *)buf, true, frames, false);
1107 static inline snd_pcm_sframes_t
1108 snd_pcm_lib_writev(struct snd_pcm_substream *substream,
1109 void __user **bufs, snd_pcm_uframes_t frames)
1111 return __snd_pcm_lib_xfer(substream, (void *)bufs, false, frames, false);
1114 static inline snd_pcm_sframes_t
1115 snd_pcm_lib_readv(struct snd_pcm_substream *substream,
1116 void __user **bufs, snd_pcm_uframes_t frames)
1118 return __snd_pcm_lib_xfer(substream, (void *)bufs, false, frames, false);
1121 static inline snd_pcm_sframes_t
1122 snd_pcm_kernel_write(struct snd_pcm_substream *substream,
1123 const void *buf, snd_pcm_uframes_t frames)
1125 return __snd_pcm_lib_xfer(substream, (void *)buf, true, frames, true);
1128 static inline snd_pcm_sframes_t
1129 snd_pcm_kernel_read(struct snd_pcm_substream *substream,
1130 void *buf, snd_pcm_uframes_t frames)
1132 return __snd_pcm_lib_xfer(substream, buf, true, frames, true);
1135 static inline snd_pcm_sframes_t
1136 snd_pcm_kernel_writev(struct snd_pcm_substream *substream,
1137 void **bufs, snd_pcm_uframes_t frames)
1139 return __snd_pcm_lib_xfer(substream, bufs, false, frames, true);
1142 static inline snd_pcm_sframes_t
1143 snd_pcm_kernel_readv(struct snd_pcm_substream *substream,
1144 void **bufs, snd_pcm_uframes_t frames)
1146 return __snd_pcm_lib_xfer(substream, bufs, false, frames, true);
1149 int snd_pcm_hw_limit_rates(struct snd_pcm_hardware *hw);
1152 snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime)
1154 return snd_pcm_hw_limit_rates(&runtime->hw);
1157 unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate);
1158 unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit);
1159 unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a,
1160 unsigned int rates_b);
1161 unsigned int snd_pcm_rate_range_to_bits(unsigned int rate_min,
1162 unsigned int rate_max);
1165 * snd_pcm_set_runtime_buffer - Set the PCM runtime buffer
1166 * @substream: PCM substream to set
1167 * @bufp: the buffer information, NULL to clear
1169 * Copy the buffer information to runtime->dma_buffer when @bufp is non-NULL.
1170 * Otherwise it clears the current buffer information.
1172 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
1173 struct snd_dma_buffer *bufp)
1175 struct snd_pcm_runtime *runtime = substream->runtime;
1177 runtime->dma_buffer_p = bufp;
1178 runtime->dma_area = bufp->area;
1179 runtime->dma_addr = bufp->addr;
1180 runtime->dma_bytes = bufp->bytes;
1182 runtime->dma_buffer_p = NULL;
1183 runtime->dma_area = NULL;
1184 runtime->dma_addr = 0;
1185 runtime->dma_bytes = 0;
1190 * snd_pcm_gettime - Fill the timespec64 depending on the timestamp mode
1191 * @runtime: PCM runtime instance
1192 * @tv: timespec64 to fill
1194 static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime,
1195 struct timespec64 *tv)
1197 switch (runtime->tstamp_type) {
1198 case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC:
1201 case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC_RAW:
1202 ktime_get_raw_ts64(tv);
1205 ktime_get_real_ts64(tv);
1214 void snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
1215 void snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
1216 void snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
1217 int type, struct device *data,
1218 size_t size, size_t max);
1219 void snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
1220 int type, void *data,
1221 size_t size, size_t max);
1222 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
1223 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
1225 int snd_pcm_set_managed_buffer(struct snd_pcm_substream *substream, int type,
1226 struct device *data, size_t size, size_t max);
1227 int snd_pcm_set_managed_buffer_all(struct snd_pcm *pcm, int type,
1228 struct device *data,
1229 size_t size, size_t max);
1232 * snd_pcm_set_fixed_buffer - Preallocate and set up the fixed size PCM buffer
1233 * @substream: the pcm substream instance
1234 * @type: DMA type (SNDRV_DMA_TYPE_*)
1235 * @data: DMA type dependent data
1236 * @size: the requested pre-allocation size in bytes
1238 * This is a variant of snd_pcm_set_managed_buffer(), but this pre-allocates
1239 * only the given sized buffer and doesn't allow re-allocation nor dynamic
1240 * allocation of a larger buffer unlike the standard one.
1241 * The function may return -ENOMEM error, hence the caller must check it.
1243 static inline int __must_check
1244 snd_pcm_set_fixed_buffer(struct snd_pcm_substream *substream, int type,
1245 struct device *data, size_t size)
1247 return snd_pcm_set_managed_buffer(substream, type, data, size, 0);
1251 * snd_pcm_set_fixed_buffer_all - Preallocate and set up the fixed size PCM buffer
1252 * @pcm: the pcm instance
1253 * @type: DMA type (SNDRV_DMA_TYPE_*)
1254 * @data: DMA type dependent data
1255 * @size: the requested pre-allocation size in bytes
1257 * Apply the set up of the fixed buffer via snd_pcm_set_fixed_buffer() for
1258 * all substream. If any of allocation fails, it returns -ENOMEM, hence the
1259 * caller must check the return value.
1261 static inline int __must_check
1262 snd_pcm_set_fixed_buffer_all(struct snd_pcm *pcm, int type,
1263 struct device *data, size_t size)
1265 return snd_pcm_set_managed_buffer_all(pcm, type, data, size, 0);
1268 int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream,
1269 size_t size, gfp_t gfp_flags);
1270 int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream);
1271 struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream,
1272 unsigned long offset);
1274 * snd_pcm_lib_alloc_vmalloc_buffer - allocate virtual DMA buffer
1275 * @substream: the substream to allocate the buffer to
1276 * @size: the requested buffer size, in bytes
1278 * Allocates the PCM substream buffer using vmalloc(), i.e., the memory is
1279 * contiguous in kernel virtual space, but not in physical memory. Use this
1280 * if the buffer is accessed by kernel code but not by device DMA.
1282 * Return: 1 if the buffer was changed, 0 if not changed, or a negative error
1285 static inline int snd_pcm_lib_alloc_vmalloc_buffer
1286 (struct snd_pcm_substream *substream, size_t size)
1288 return _snd_pcm_lib_alloc_vmalloc_buffer(substream, size,
1289 GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
1293 * snd_pcm_lib_alloc_vmalloc_32_buffer - allocate 32-bit-addressable buffer
1294 * @substream: the substream to allocate the buffer to
1295 * @size: the requested buffer size, in bytes
1297 * This function works like snd_pcm_lib_alloc_vmalloc_buffer(), but uses
1298 * vmalloc_32(), i.e., the pages are allocated from 32-bit-addressable memory.
1300 * Return: 1 if the buffer was changed, 0 if not changed, or a negative error
1303 static inline int snd_pcm_lib_alloc_vmalloc_32_buffer
1304 (struct snd_pcm_substream *substream, size_t size)
1306 return _snd_pcm_lib_alloc_vmalloc_buffer(substream, size,
1307 GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1310 #define snd_pcm_get_dma_buf(substream) ((substream)->runtime->dma_buffer_p)
1313 * snd_pcm_sgbuf_get_addr - Get the DMA address at the corresponding offset
1314 * @substream: PCM substream
1317 static inline dma_addr_t
1318 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
1320 return snd_sgbuf_get_addr(snd_pcm_get_dma_buf(substream), ofs);
1324 * snd_pcm_sgbuf_get_chunk_size - Compute the max size that fits within the
1325 * contig. page from the given size
1326 * @substream: PCM substream
1328 * @size: byte size to examine
1330 static inline unsigned int
1331 snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
1332 unsigned int ofs, unsigned int size)
1334 return snd_sgbuf_get_chunk_size(snd_pcm_get_dma_buf(substream), ofs, size);
1338 * snd_pcm_mmap_data_open - increase the mmap counter
1341 * PCM mmap callback should handle this counter properly
1343 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
1345 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1346 atomic_inc(&substream->mmap_count);
1350 * snd_pcm_mmap_data_close - decrease the mmap counter
1353 * PCM mmap callback should handle this counter properly
1355 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
1357 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1358 atomic_dec(&substream->mmap_count);
1361 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
1362 struct vm_area_struct *area);
1363 /* mmap for io-memory area */
1364 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
1365 #define SNDRV_PCM_INFO_MMAP_IOMEM SNDRV_PCM_INFO_MMAP
1366 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
1368 #define SNDRV_PCM_INFO_MMAP_IOMEM 0
1369 #define snd_pcm_lib_mmap_iomem NULL
1373 * snd_pcm_limit_isa_dma_size - Get the max size fitting with ISA DMA transfer
1375 * @max: pointer to store the max size
1377 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
1379 *max = dma < 4 ? 64 * 1024 : 128 * 1024;
1386 #define SNDRV_PCM_DEFAULT_CON_SPDIF (IEC958_AES0_CON_EMPHASIS_NONE|\
1387 (IEC958_AES1_CON_ORIGINAL<<8)|\
1388 (IEC958_AES1_CON_PCM_CODER<<8)|\
1389 (IEC958_AES3_CON_FS_48000<<24))
1391 const char *snd_pcm_format_name(snd_pcm_format_t format);
1394 * snd_pcm_stream_str - Get a string naming the direction of a stream
1395 * @substream: the pcm substream instance
1397 * Return: A string naming the direction of the stream.
1399 static inline const char *snd_pcm_stream_str(struct snd_pcm_substream *substream)
1401 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1408 * PCM channel-mapping control API
1410 /* array element of channel maps */
1411 struct snd_pcm_chmap_elem {
1412 unsigned char channels;
1413 unsigned char map[15];
1416 /* channel map information; retrieved via snd_kcontrol_chip() */
1417 struct snd_pcm_chmap {
1418 struct snd_pcm *pcm; /* assigned PCM instance */
1419 int stream; /* PLAYBACK or CAPTURE */
1420 struct snd_kcontrol *kctl;
1421 const struct snd_pcm_chmap_elem *chmap;
1422 unsigned int max_channels;
1423 unsigned int channel_mask; /* optional: active channels bitmask */
1424 void *private_data; /* optional: private data pointer */
1428 * snd_pcm_chmap_substream - get the PCM substream assigned to the given chmap info
1429 * @info: chmap information
1430 * @idx: the substream number index
1432 static inline struct snd_pcm_substream *
1433 snd_pcm_chmap_substream(struct snd_pcm_chmap *info, unsigned int idx)
1435 struct snd_pcm_substream *s;
1436 for (s = info->pcm->streams[info->stream].substream; s; s = s->next)
1437 if (s->number == idx)
1442 /* ALSA-standard channel maps (RL/RR prior to C/LFE) */
1443 extern const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[];
1444 /* Other world's standard channel maps (C/LFE prior to RL/RR) */
1445 extern const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[];
1447 /* bit masks to be passed to snd_pcm_chmap.channel_mask field */
1448 #define SND_PCM_CHMAP_MASK_24 ((1U << 2) | (1U << 4))
1449 #define SND_PCM_CHMAP_MASK_246 (SND_PCM_CHMAP_MASK_24 | (1U << 6))
1450 #define SND_PCM_CHMAP_MASK_2468 (SND_PCM_CHMAP_MASK_246 | (1U << 8))
1452 int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
1453 const struct snd_pcm_chmap_elem *chmap,
1455 unsigned long private_value,
1456 struct snd_pcm_chmap **info_ret);
1459 * pcm_format_to_bits - Strong-typed conversion of pcm_format to bitwise
1460 * @pcm_format: PCM format
1462 static inline u64 pcm_format_to_bits(snd_pcm_format_t pcm_format)
1464 return 1ULL << (__force int) pcm_format;
1468 * pcm_for_each_format - helper to iterate for each format type
1469 * @f: the iterator variable in snd_pcm_format_t type
1471 #define pcm_for_each_format(f) \
1472 for ((f) = SNDRV_PCM_FORMAT_FIRST; \
1473 (__force int)(f) <= (__force int)SNDRV_PCM_FORMAT_LAST; \
1474 (f) = (__force snd_pcm_format_t)((__force int)(f) + 1))
1476 /* printk helpers */
1477 #define pcm_err(pcm, fmt, args...) \
1478 dev_err((pcm)->card->dev, fmt, ##args)
1479 #define pcm_warn(pcm, fmt, args...) \
1480 dev_warn((pcm)->card->dev, fmt, ##args)
1481 #define pcm_dbg(pcm, fmt, args...) \
1482 dev_dbg((pcm)->card->dev, fmt, ##args)
1484 struct snd_pcm_status64 {
1485 snd_pcm_state_t state; /* stream state */
1487 s64 trigger_tstamp_sec; /* time when stream was started/stopped/paused */
1488 s64 trigger_tstamp_nsec;
1489 s64 tstamp_sec; /* reference timestamp */
1491 snd_pcm_uframes_t appl_ptr; /* appl ptr */
1492 snd_pcm_uframes_t hw_ptr; /* hw ptr */
1493 snd_pcm_sframes_t delay; /* current delay in frames */
1494 snd_pcm_uframes_t avail; /* number of frames available */
1495 snd_pcm_uframes_t avail_max; /* max frames available on hw since last status */
1496 snd_pcm_uframes_t overrange; /* count of ADC (capture) overrange detections from last status */
1497 snd_pcm_state_t suspended_state; /* suspended stream state */
1498 __u32 audio_tstamp_data; /* needed for 64-bit alignment, used for configs/report to/from userspace */
1499 s64 audio_tstamp_sec; /* sample counter, wall clock, PHC or on-demand sync'ed */
1500 s64 audio_tstamp_nsec;
1501 s64 driver_tstamp_sec; /* useful in case reference system tstamp is reported with delay */
1502 s64 driver_tstamp_nsec;
1503 __u32 audio_tstamp_accuracy; /* in ns units, only valid if indicated in audio_tstamp_data */
1504 unsigned char reserved[52-4*sizeof(s64)]; /* must be filled with zero */
1507 #define SNDRV_PCM_IOCTL_STATUS64 _IOR('A', 0x20, struct snd_pcm_status64)
1508 #define SNDRV_PCM_IOCTL_STATUS_EXT64 _IOWR('A', 0x24, struct snd_pcm_status64)
1510 struct snd_pcm_status32 {
1511 snd_pcm_state_t state; /* stream state */
1512 s32 trigger_tstamp_sec; /* time when stream was started/stopped/paused */
1513 s32 trigger_tstamp_nsec;
1514 s32 tstamp_sec; /* reference timestamp */
1516 u32 appl_ptr; /* appl ptr */
1517 u32 hw_ptr; /* hw ptr */
1518 s32 delay; /* current delay in frames */
1519 u32 avail; /* number of frames available */
1520 u32 avail_max; /* max frames available on hw since last status */
1521 u32 overrange; /* count of ADC (capture) overrange detections from last status */
1522 snd_pcm_state_t suspended_state; /* suspended stream state */
1523 u32 audio_tstamp_data; /* needed for 64-bit alignment, used for configs/report to/from userspace */
1524 s32 audio_tstamp_sec; /* sample counter, wall clock, PHC or on-demand sync'ed */
1525 s32 audio_tstamp_nsec;
1526 s32 driver_tstamp_sec; /* useful in case reference system tstamp is reported with delay */
1527 s32 driver_tstamp_nsec;
1528 u32 audio_tstamp_accuracy; /* in ns units, only valid if indicated in audio_tstamp_data */
1529 unsigned char reserved[52-4*sizeof(s32)]; /* must be filled with zero */
1532 #define SNDRV_PCM_IOCTL_STATUS32 _IOR('A', 0x20, struct snd_pcm_status32)
1533 #define SNDRV_PCM_IOCTL_STATUS_EXT32 _IOWR('A', 0x24, struct snd_pcm_status32)
1535 #endif /* __SOUND_PCM_H */