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 (1U<<0) /* 5512Hz */
110 #define SNDRV_PCM_RATE_8000 (1U<<1) /* 8000Hz */
111 #define SNDRV_PCM_RATE_11025 (1U<<2) /* 11025Hz */
112 #define SNDRV_PCM_RATE_16000 (1U<<3) /* 16000Hz */
113 #define SNDRV_PCM_RATE_22050 (1U<<4) /* 22050Hz */
114 #define SNDRV_PCM_RATE_32000 (1U<<5) /* 32000Hz */
115 #define SNDRV_PCM_RATE_44100 (1U<<6) /* 44100Hz */
116 #define SNDRV_PCM_RATE_48000 (1U<<7) /* 48000Hz */
117 #define SNDRV_PCM_RATE_64000 (1U<<8) /* 64000Hz */
118 #define SNDRV_PCM_RATE_88200 (1U<<9) /* 88200Hz */
119 #define SNDRV_PCM_RATE_96000 (1U<<10) /* 96000Hz */
120 #define SNDRV_PCM_RATE_176400 (1U<<11) /* 176400Hz */
121 #define SNDRV_PCM_RATE_192000 (1U<<12) /* 192000Hz */
122 #define SNDRV_PCM_RATE_352800 (1U<<13) /* 352800Hz */
123 #define SNDRV_PCM_RATE_384000 (1U<<14) /* 384000Hz */
125 #define SNDRV_PCM_RATE_CONTINUOUS (1U<<30) /* continuous range */
126 #define SNDRV_PCM_RATE_KNOT (1U<<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 snd_pcm_state_t state; /* stream state */
350 snd_pcm_state_t suspended_state; /* suspended stream state */
351 struct snd_pcm_substream *trigger_master;
352 struct timespec64 trigger_tstamp; /* trigger timestamp */
353 bool trigger_tstamp_latched; /* trigger timestamp latched in low-level driver/hardware */
355 snd_pcm_uframes_t avail_max;
356 snd_pcm_uframes_t hw_ptr_base; /* Position at buffer restart */
357 snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time */
358 unsigned long hw_ptr_jiffies; /* Time when hw_ptr is updated */
359 unsigned long hw_ptr_buffer_jiffies; /* buffer time in jiffies */
360 snd_pcm_sframes_t delay; /* extra delay; typically FIFO size */
361 u64 hw_ptr_wrap; /* offset for hw_ptr due to boundary wrap-around */
363 /* -- HW params -- */
364 snd_pcm_access_t access; /* access mode */
365 snd_pcm_format_t format; /* SNDRV_PCM_FORMAT_* */
366 snd_pcm_subformat_t subformat; /* subformat */
367 unsigned int rate; /* rate in Hz */
368 unsigned int channels; /* channels */
369 snd_pcm_uframes_t period_size; /* period size */
370 unsigned int periods; /* periods */
371 snd_pcm_uframes_t buffer_size; /* buffer size */
372 snd_pcm_uframes_t min_align; /* Min alignment for the format */
374 unsigned int frame_bits;
375 unsigned int sample_bits;
377 unsigned int rate_num;
378 unsigned int rate_den;
379 unsigned int no_period_wakeup: 1;
381 /* -- SW params; see struct snd_pcm_sw_params for comments -- */
383 unsigned int period_step;
384 snd_pcm_uframes_t start_threshold;
385 snd_pcm_uframes_t stop_threshold;
386 snd_pcm_uframes_t silence_threshold;
387 snd_pcm_uframes_t silence_size;
388 snd_pcm_uframes_t boundary;
390 /* internal data of auto-silencer */
391 snd_pcm_uframes_t silence_start; /* starting pointer to silence area */
392 snd_pcm_uframes_t silence_filled; /* already filled part of silence area */
394 union snd_pcm_sync_id sync; /* hardware synchronization ID */
397 struct snd_pcm_mmap_status *status;
398 struct snd_pcm_mmap_control *control;
400 /* -- locking / scheduling -- */
401 snd_pcm_uframes_t twake; /* do transfer (!poll) wakeup if non-zero */
402 wait_queue_head_t sleep; /* poll sleep */
403 wait_queue_head_t tsleep; /* transfer sleep */
404 struct snd_fasync *fasync;
405 bool stop_operating; /* sync_stop will be called */
406 struct mutex buffer_mutex; /* protect for buffer changes */
407 atomic_t buffer_accessing; /* >0: in r/w operation, <0: blocked */
409 /* -- private section -- */
411 void (*private_free)(struct snd_pcm_runtime *runtime);
413 /* -- hardware description -- */
414 struct snd_pcm_hardware hw;
415 struct snd_pcm_hw_constraints hw_constraints;
418 unsigned int timer_resolution; /* timer resolution */
419 int tstamp_type; /* timestamp type */
422 unsigned char *dma_area; /* DMA area */
423 dma_addr_t dma_addr; /* physical bus address (not accessible from main CPU) */
424 size_t dma_bytes; /* size of DMA area */
426 struct snd_dma_buffer *dma_buffer_p; /* allocated buffer */
427 unsigned int buffer_changed:1; /* buffer allocation changed; set only in managed mode */
429 /* -- audio timestamp config -- */
430 struct snd_pcm_audio_tstamp_config audio_tstamp_config;
431 struct snd_pcm_audio_tstamp_report audio_tstamp_report;
432 struct timespec64 driver_tstamp;
434 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
435 /* -- OSS things -- */
436 struct snd_pcm_oss_runtime oss;
440 struct snd_pcm_group { /* keep linked substreams */
443 struct list_head substreams;
449 struct snd_pcm_substream {
451 struct snd_pcm_str *pstr;
452 void *private_data; /* copied from pcm->private_data */
454 char name[32]; /* substream name */
455 int stream; /* stream (direction) */
456 struct pm_qos_request latency_pm_qos_req; /* pm_qos request */
457 size_t buffer_bytes_max; /* limit ring buffer size */
458 struct snd_dma_buffer dma_buffer;
460 /* -- hardware operations -- */
461 const struct snd_pcm_ops *ops;
462 /* -- runtime information -- */
463 struct snd_pcm_runtime *runtime;
464 /* -- timer section -- */
465 struct snd_timer *timer; /* timer */
466 unsigned timer_running: 1; /* time is running */
467 long wait_time; /* time in ms for R/W to wait for avail */
468 /* -- next substream -- */
469 struct snd_pcm_substream *next;
470 /* -- linked substreams -- */
471 struct list_head link_list; /* linked list member */
472 struct snd_pcm_group self_group; /* fake group for non linked substream (with substream lock inside) */
473 struct snd_pcm_group *group; /* pointer to current group */
474 /* -- assigned files -- */
477 unsigned int f_flags;
478 void (*pcm_release)(struct snd_pcm_substream *);
480 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
481 /* -- OSS things -- */
482 struct snd_pcm_oss_substream oss;
484 #ifdef CONFIG_SND_VERBOSE_PROCFS
485 struct snd_info_entry *proc_root;
486 #endif /* CONFIG_SND_VERBOSE_PROCFS */
488 unsigned int hw_opened: 1;
489 unsigned int managed_buffer_alloc:1;
492 #define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0)
496 int stream; /* stream (direction) */
498 /* -- substreams -- */
499 unsigned int substream_count;
500 unsigned int substream_opened;
501 struct snd_pcm_substream *substream;
502 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
503 /* -- OSS things -- */
504 struct snd_pcm_oss_stream oss;
506 #ifdef CONFIG_SND_VERBOSE_PROCFS
507 struct snd_info_entry *proc_root;
508 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
509 unsigned int xrun_debug; /* 0 = disabled, 1 = verbose, 2 = stacktrace */
512 struct snd_kcontrol *chmap_kctl; /* channel-mapping controls */
517 struct snd_card *card;
518 struct list_head list;
519 int device; /* device number */
520 unsigned int info_flags;
521 unsigned short dev_class;
522 unsigned short dev_subclass;
525 struct snd_pcm_str streams[2];
526 struct mutex open_mutex;
527 wait_queue_head_t open_wait;
529 void (*private_free) (struct snd_pcm *pcm);
530 bool internal; /* pcm is for internal use only */
531 bool nonatomic; /* whole PCM operations are in non-atomic context */
532 bool no_device_suspend; /* don't invoke device PM suspend */
533 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
534 struct snd_pcm_oss oss;
542 extern const struct file_operations snd_pcm_f_ops[2];
544 int snd_pcm_new(struct snd_card *card, const char *id, int device,
545 int playback_count, int capture_count,
546 struct snd_pcm **rpcm);
547 int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
548 int playback_count, int capture_count,
549 struct snd_pcm **rpcm);
550 int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count);
552 #if IS_ENABLED(CONFIG_SND_PCM_OSS)
553 struct snd_pcm_notify {
554 int (*n_register) (struct snd_pcm * pcm);
555 int (*n_disconnect) (struct snd_pcm * pcm);
556 int (*n_unregister) (struct snd_pcm * pcm);
557 struct list_head list;
559 int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree);
566 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info);
567 int snd_pcm_info_user(struct snd_pcm_substream *substream,
568 struct snd_pcm_info __user *info);
569 int snd_pcm_status64(struct snd_pcm_substream *substream,
570 struct snd_pcm_status64 *status);
571 int snd_pcm_start(struct snd_pcm_substream *substream);
572 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t status);
573 int snd_pcm_drain_done(struct snd_pcm_substream *substream);
574 int snd_pcm_stop_xrun(struct snd_pcm_substream *substream);
576 int snd_pcm_suspend_all(struct snd_pcm *pcm);
578 static inline int snd_pcm_suspend_all(struct snd_pcm *pcm)
583 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg);
584 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file,
585 struct snd_pcm_substream **rsubstream);
586 void snd_pcm_release_substream(struct snd_pcm_substream *substream);
587 int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file,
588 struct snd_pcm_substream **rsubstream);
589 void snd_pcm_detach_substream(struct snd_pcm_substream *substream);
590 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area);
593 #ifdef CONFIG_SND_DEBUG
594 void snd_pcm_debug_name(struct snd_pcm_substream *substream,
595 char *name, size_t len);
598 snd_pcm_debug_name(struct snd_pcm_substream *substream, char *buf, size_t size)
609 * snd_pcm_stream_linked - Check whether the substream is linked with others
610 * @substream: substream to check
612 * Return: true if the given substream is being linked with others
614 static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream)
616 return substream->group != &substream->self_group;
619 void snd_pcm_stream_lock(struct snd_pcm_substream *substream);
620 void snd_pcm_stream_unlock(struct snd_pcm_substream *substream);
621 void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream);
622 void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream);
623 unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream);
624 unsigned long _snd_pcm_stream_lock_irqsave_nested(struct snd_pcm_substream *substream);
627 * snd_pcm_stream_lock_irqsave - Lock the PCM stream
628 * @substream: PCM substream
631 * This locks the PCM stream like snd_pcm_stream_lock() but with the local
632 * IRQ (only when nonatomic is false). In nonatomic case, this is identical
633 * as snd_pcm_stream_lock().
635 #define snd_pcm_stream_lock_irqsave(substream, flags) \
637 typecheck(unsigned long, flags); \
638 flags = _snd_pcm_stream_lock_irqsave(substream); \
640 void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream,
641 unsigned long flags);
644 * snd_pcm_stream_lock_irqsave_nested - Single-nested PCM stream locking
645 * @substream: PCM substream
648 * This locks the PCM stream like snd_pcm_stream_lock_irqsave() but with
649 * the single-depth lockdep subclass.
651 #define snd_pcm_stream_lock_irqsave_nested(substream, flags) \
653 typecheck(unsigned long, flags); \
654 flags = _snd_pcm_stream_lock_irqsave_nested(substream); \
658 * snd_pcm_group_for_each_entry - iterate over the linked substreams
660 * @substream: the substream
662 * Iterate over the all linked substreams to the given @substream.
663 * When @substream isn't linked with any others, this gives returns @substream
666 #define snd_pcm_group_for_each_entry(s, substream) \
667 list_for_each_entry(s, &substream->group->substreams, link_list)
669 #define for_each_pcm_streams(stream) \
670 for (stream = SNDRV_PCM_STREAM_PLAYBACK; \
671 stream <= SNDRV_PCM_STREAM_LAST; \
675 * snd_pcm_running - Check whether the substream is in a running state
676 * @substream: substream to check
678 * Return: true if the given substream is in the state RUNNING, or in the
679 * state DRAINING for playback.
681 static inline int snd_pcm_running(struct snd_pcm_substream *substream)
683 return (substream->runtime->state == SNDRV_PCM_STATE_RUNNING ||
684 (substream->runtime->state == SNDRV_PCM_STATE_DRAINING &&
685 substream->stream == SNDRV_PCM_STREAM_PLAYBACK));
689 * __snd_pcm_set_state - Change the current PCM state
690 * @runtime: PCM runtime to set
691 * @state: the current state to set
693 * Call within the stream lock
695 static inline void __snd_pcm_set_state(struct snd_pcm_runtime *runtime,
696 snd_pcm_state_t state)
698 runtime->state = state;
699 runtime->status->state = state; /* copy for mmap */
703 * bytes_to_samples - Unit conversion of the size from bytes to samples
704 * @runtime: PCM runtime instance
705 * @size: size in bytes
707 * Return: the size in samples
709 static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size)
711 return size * 8 / runtime->sample_bits;
715 * bytes_to_frames - Unit conversion of the size from bytes to frames
716 * @runtime: PCM runtime instance
717 * @size: size in bytes
719 * Return: the size in frames
721 static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size)
723 return size * 8 / runtime->frame_bits;
727 * samples_to_bytes - Unit conversion of the size from samples to bytes
728 * @runtime: PCM runtime instance
729 * @size: size in samples
731 * Return: the byte size
733 static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size)
735 return size * runtime->sample_bits / 8;
739 * frames_to_bytes - Unit conversion of the size from frames to bytes
740 * @runtime: PCM runtime instance
741 * @size: size in frames
743 * Return: the byte size
745 static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size)
747 return size * runtime->frame_bits / 8;
751 * frame_aligned - Check whether the byte size is aligned to frames
752 * @runtime: PCM runtime instance
753 * @bytes: size in bytes
755 * Return: true if aligned, or false if not
757 static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes)
759 return bytes % runtime->byte_align == 0;
763 * snd_pcm_lib_buffer_bytes - Get the buffer size of the current PCM in bytes
764 * @substream: PCM substream
766 * Return: buffer byte size
768 static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream)
770 struct snd_pcm_runtime *runtime = substream->runtime;
771 return frames_to_bytes(runtime, runtime->buffer_size);
775 * snd_pcm_lib_period_bytes - Get the period size of the current PCM in bytes
776 * @substream: PCM substream
778 * Return: period byte size
780 static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream)
782 struct snd_pcm_runtime *runtime = substream->runtime;
783 return frames_to_bytes(runtime, runtime->period_size);
787 * snd_pcm_playback_avail - Get the available (writable) space for playback
788 * @runtime: PCM runtime instance
790 * Result is between 0 ... (boundary - 1)
792 * Return: available frame size
794 static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime)
796 snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr;
798 avail += runtime->boundary;
799 else if ((snd_pcm_uframes_t) avail >= runtime->boundary)
800 avail -= runtime->boundary;
805 * snd_pcm_capture_avail - Get the available (readable) space for capture
806 * @runtime: PCM runtime instance
808 * Result is between 0 ... (boundary - 1)
810 * Return: available frame size
812 static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime)
814 snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr;
816 avail += runtime->boundary;
821 * snd_pcm_playback_hw_avail - Get the queued space for playback
822 * @runtime: PCM runtime instance
824 * Return: available frame size
826 static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime)
828 return runtime->buffer_size - snd_pcm_playback_avail(runtime);
832 * snd_pcm_capture_hw_avail - Get the free space for capture
833 * @runtime: PCM runtime instance
835 * Return: available frame size
837 static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime)
839 return runtime->buffer_size - snd_pcm_capture_avail(runtime);
843 * snd_pcm_playback_ready - check whether the playback buffer is available
844 * @substream: the pcm substream instance
846 * Checks whether enough free space is available on the playback buffer.
848 * Return: Non-zero if available, or zero if not.
850 static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream)
852 struct snd_pcm_runtime *runtime = substream->runtime;
853 return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min;
857 * snd_pcm_capture_ready - check whether the capture buffer is available
858 * @substream: the pcm substream instance
860 * Checks whether enough capture data is available on the capture buffer.
862 * Return: Non-zero if available, or zero if not.
864 static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream)
866 struct snd_pcm_runtime *runtime = substream->runtime;
867 return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min;
871 * snd_pcm_playback_data - check whether any data exists on the playback buffer
872 * @substream: the pcm substream instance
874 * Checks whether any data exists on the playback buffer.
876 * Return: Non-zero if any data exists, or zero if not. If stop_threshold
877 * is bigger or equal to boundary, then this function returns always non-zero.
879 static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream)
881 struct snd_pcm_runtime *runtime = substream->runtime;
883 if (runtime->stop_threshold >= runtime->boundary)
885 return snd_pcm_playback_avail(runtime) < runtime->buffer_size;
889 * snd_pcm_playback_empty - check whether the playback buffer is empty
890 * @substream: the pcm substream instance
892 * Checks whether the playback buffer is empty.
894 * Return: Non-zero if empty, or zero if not.
896 static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream)
898 struct snd_pcm_runtime *runtime = substream->runtime;
899 return snd_pcm_playback_avail(runtime) >= runtime->buffer_size;
903 * snd_pcm_capture_empty - check whether the capture buffer is empty
904 * @substream: the pcm substream instance
906 * Checks whether the capture buffer is empty.
908 * Return: Non-zero if empty, or zero if not.
910 static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream)
912 struct snd_pcm_runtime *runtime = substream->runtime;
913 return snd_pcm_capture_avail(runtime) == 0;
917 * snd_pcm_trigger_done - Mark the master substream
918 * @substream: the pcm substream instance
919 * @master: the linked master substream
921 * When multiple substreams of the same card are linked and the hardware
922 * supports the single-shot operation, the driver calls this in the loop
923 * in snd_pcm_group_for_each_entry() for marking the substream as "done".
924 * Then most of trigger operations are performed only to the given master
927 * The trigger_master mark is cleared at timestamp updates at the end
928 * of trigger operations.
930 static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream,
931 struct snd_pcm_substream *master)
933 substream->runtime->trigger_master = master;
936 static inline int hw_is_mask(int var)
938 return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK &&
939 var <= SNDRV_PCM_HW_PARAM_LAST_MASK;
942 static inline int hw_is_interval(int var)
944 return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL &&
945 var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL;
948 static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params,
949 snd_pcm_hw_param_t var)
951 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
954 static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params,
955 snd_pcm_hw_param_t var)
957 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
960 static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params,
961 snd_pcm_hw_param_t var)
963 return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK];
966 static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params,
967 snd_pcm_hw_param_t var)
969 return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL];
973 * params_channels - Get the number of channels from the hw params
976 * Return: the number of channels
978 static inline unsigned int params_channels(const struct snd_pcm_hw_params *p)
980 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_CHANNELS)->min;
984 * params_rate - Get the sample rate from the hw params
987 * Return: the sample rate
989 static inline unsigned int params_rate(const struct snd_pcm_hw_params *p)
991 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_RATE)->min;
995 * params_period_size - Get the period size (in frames) from the hw params
998 * Return: the period size in frames
1000 static inline unsigned int params_period_size(const struct snd_pcm_hw_params *p)
1002 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min;
1006 * params_periods - Get the number of periods from the hw params
1009 * Return: the number of periods
1011 static inline unsigned int params_periods(const struct snd_pcm_hw_params *p)
1013 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIODS)->min;
1017 * params_buffer_size - Get the buffer size (in frames) from the hw params
1020 * Return: the buffer size in frames
1022 static inline unsigned int params_buffer_size(const struct snd_pcm_hw_params *p)
1024 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min;
1028 * params_buffer_bytes - Get the buffer size (in bytes) from the hw params
1031 * Return: the buffer size in bytes
1033 static inline unsigned int params_buffer_bytes(const struct snd_pcm_hw_params *p)
1035 return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min;
1038 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v);
1039 int snd_interval_list(struct snd_interval *i, unsigned int count,
1040 const unsigned int *list, unsigned int mask);
1041 int snd_interval_ranges(struct snd_interval *i, unsigned int count,
1042 const struct snd_interval *list, unsigned int mask);
1043 int snd_interval_ratnum(struct snd_interval *i,
1044 unsigned int rats_count, const struct snd_ratnum *rats,
1045 unsigned int *nump, unsigned int *denp);
1047 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params);
1048 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var);
1050 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params);
1052 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1054 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1055 unsigned int min, unsigned int max);
1056 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var);
1057 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
1059 snd_pcm_hw_param_t var,
1060 const struct snd_pcm_hw_constraint_list *l);
1061 int snd_pcm_hw_constraint_ranges(struct snd_pcm_runtime *runtime,
1063 snd_pcm_hw_param_t var,
1064 const struct snd_pcm_hw_constraint_ranges *r);
1065 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
1067 snd_pcm_hw_param_t var,
1068 const struct snd_pcm_hw_constraint_ratnums *r);
1069 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1071 snd_pcm_hw_param_t var,
1072 const struct snd_pcm_hw_constraint_ratdens *r);
1073 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1076 unsigned int msbits);
1077 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1079 snd_pcm_hw_param_t var,
1080 unsigned long step);
1081 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1083 snd_pcm_hw_param_t var);
1084 int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
1085 unsigned int base_rate);
1086 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime,
1089 snd_pcm_hw_rule_func_t func, void *private,
1093 * snd_pcm_hw_constraint_single() - Constrain parameter to a single value
1094 * @runtime: PCM runtime instance
1095 * @var: The hw_params variable to constrain
1096 * @val: The value to constrain to
1098 * Return: Positive if the value is changed, zero if it's not changed, or a
1099 * negative error code.
1101 static inline int snd_pcm_hw_constraint_single(
1102 struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1105 return snd_pcm_hw_constraint_minmax(runtime, var, val, val);
1108 int snd_pcm_format_signed(snd_pcm_format_t format);
1109 int snd_pcm_format_unsigned(snd_pcm_format_t format);
1110 int snd_pcm_format_linear(snd_pcm_format_t format);
1111 int snd_pcm_format_little_endian(snd_pcm_format_t format);
1112 int snd_pcm_format_big_endian(snd_pcm_format_t format);
1113 #if 0 /* just for kernel-doc */
1115 * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian
1116 * @format: the format to check
1118 * Return: 1 if the given PCM format is CPU-endian, 0 if
1119 * opposite, or a negative error code if endian not specified.
1121 int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
1122 #endif /* DocBook */
1123 #ifdef SNDRV_LITTLE_ENDIAN
1124 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format)
1126 #define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format)
1128 int snd_pcm_format_width(snd_pcm_format_t format); /* in bits */
1129 int snd_pcm_format_physical_width(snd_pcm_format_t format); /* in bits */
1130 ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
1131 const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format);
1132 int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
1134 void snd_pcm_set_ops(struct snd_pcm * pcm, int direction,
1135 const struct snd_pcm_ops *ops);
1136 void snd_pcm_set_sync(struct snd_pcm_substream *substream);
1137 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1138 unsigned int cmd, void *arg);
1139 void snd_pcm_period_elapsed_under_stream_lock(struct snd_pcm_substream *substream);
1140 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream);
1141 snd_pcm_sframes_t __snd_pcm_lib_xfer(struct snd_pcm_substream *substream,
1142 void *buf, bool interleaved,
1143 snd_pcm_uframes_t frames, bool in_kernel);
1145 static inline snd_pcm_sframes_t
1146 snd_pcm_lib_write(struct snd_pcm_substream *substream,
1147 const void __user *buf, snd_pcm_uframes_t frames)
1149 return __snd_pcm_lib_xfer(substream, (void __force *)buf, true, frames, false);
1152 static inline snd_pcm_sframes_t
1153 snd_pcm_lib_read(struct snd_pcm_substream *substream,
1154 void __user *buf, snd_pcm_uframes_t frames)
1156 return __snd_pcm_lib_xfer(substream, (void __force *)buf, true, frames, false);
1159 static inline snd_pcm_sframes_t
1160 snd_pcm_lib_writev(struct snd_pcm_substream *substream,
1161 void __user **bufs, snd_pcm_uframes_t frames)
1163 return __snd_pcm_lib_xfer(substream, (void *)bufs, false, frames, false);
1166 static inline snd_pcm_sframes_t
1167 snd_pcm_lib_readv(struct snd_pcm_substream *substream,
1168 void __user **bufs, snd_pcm_uframes_t frames)
1170 return __snd_pcm_lib_xfer(substream, (void *)bufs, false, frames, false);
1173 static inline snd_pcm_sframes_t
1174 snd_pcm_kernel_write(struct snd_pcm_substream *substream,
1175 const void *buf, snd_pcm_uframes_t frames)
1177 return __snd_pcm_lib_xfer(substream, (void *)buf, true, frames, true);
1180 static inline snd_pcm_sframes_t
1181 snd_pcm_kernel_read(struct snd_pcm_substream *substream,
1182 void *buf, snd_pcm_uframes_t frames)
1184 return __snd_pcm_lib_xfer(substream, buf, true, frames, true);
1187 static inline snd_pcm_sframes_t
1188 snd_pcm_kernel_writev(struct snd_pcm_substream *substream,
1189 void **bufs, snd_pcm_uframes_t frames)
1191 return __snd_pcm_lib_xfer(substream, bufs, false, frames, true);
1194 static inline snd_pcm_sframes_t
1195 snd_pcm_kernel_readv(struct snd_pcm_substream *substream,
1196 void **bufs, snd_pcm_uframes_t frames)
1198 return __snd_pcm_lib_xfer(substream, bufs, false, frames, true);
1201 int snd_pcm_hw_limit_rates(struct snd_pcm_hardware *hw);
1204 snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime)
1206 return snd_pcm_hw_limit_rates(&runtime->hw);
1209 unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate);
1210 unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit);
1211 unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a,
1212 unsigned int rates_b);
1213 unsigned int snd_pcm_rate_range_to_bits(unsigned int rate_min,
1214 unsigned int rate_max);
1217 * snd_pcm_set_runtime_buffer - Set the PCM runtime buffer
1218 * @substream: PCM substream to set
1219 * @bufp: the buffer information, NULL to clear
1221 * Copy the buffer information to runtime->dma_buffer when @bufp is non-NULL.
1222 * Otherwise it clears the current buffer information.
1224 static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,
1225 struct snd_dma_buffer *bufp)
1227 struct snd_pcm_runtime *runtime = substream->runtime;
1229 runtime->dma_buffer_p = bufp;
1230 runtime->dma_area = bufp->area;
1231 runtime->dma_addr = bufp->addr;
1232 runtime->dma_bytes = bufp->bytes;
1234 runtime->dma_buffer_p = NULL;
1235 runtime->dma_area = NULL;
1236 runtime->dma_addr = 0;
1237 runtime->dma_bytes = 0;
1242 * snd_pcm_gettime - Fill the timespec64 depending on the timestamp mode
1243 * @runtime: PCM runtime instance
1244 * @tv: timespec64 to fill
1246 static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime,
1247 struct timespec64 *tv)
1249 switch (runtime->tstamp_type) {
1250 case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC:
1253 case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC_RAW:
1254 ktime_get_raw_ts64(tv);
1257 ktime_get_real_ts64(tv);
1266 void snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream);
1267 void snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm);
1268 void snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream,
1269 int type, struct device *data,
1270 size_t size, size_t max);
1271 void snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm,
1272 int type, void *data,
1273 size_t size, size_t max);
1274 int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size);
1275 int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream);
1277 int snd_pcm_set_managed_buffer(struct snd_pcm_substream *substream, int type,
1278 struct device *data, size_t size, size_t max);
1279 int snd_pcm_set_managed_buffer_all(struct snd_pcm *pcm, int type,
1280 struct device *data,
1281 size_t size, size_t max);
1284 * snd_pcm_set_fixed_buffer - Preallocate and set up the fixed size PCM buffer
1285 * @substream: the pcm substream instance
1286 * @type: DMA type (SNDRV_DMA_TYPE_*)
1287 * @data: DMA type dependent data
1288 * @size: the requested pre-allocation size in bytes
1290 * This is a variant of snd_pcm_set_managed_buffer(), but this pre-allocates
1291 * only the given sized buffer and doesn't allow re-allocation nor dynamic
1292 * allocation of a larger buffer unlike the standard one.
1293 * The function may return -ENOMEM error, hence the caller must check it.
1295 * Return: zero if successful, or a negative error code
1297 static inline int __must_check
1298 snd_pcm_set_fixed_buffer(struct snd_pcm_substream *substream, int type,
1299 struct device *data, size_t size)
1301 return snd_pcm_set_managed_buffer(substream, type, data, size, 0);
1305 * snd_pcm_set_fixed_buffer_all - Preallocate and set up the fixed size PCM buffer
1306 * @pcm: the pcm instance
1307 * @type: DMA type (SNDRV_DMA_TYPE_*)
1308 * @data: DMA type dependent data
1309 * @size: the requested pre-allocation size in bytes
1311 * Apply the set up of the fixed buffer via snd_pcm_set_fixed_buffer() for
1312 * all substream. If any of allocation fails, it returns -ENOMEM, hence the
1313 * caller must check the return value.
1315 * Return: zero if successful, or a negative error code
1317 static inline int __must_check
1318 snd_pcm_set_fixed_buffer_all(struct snd_pcm *pcm, int type,
1319 struct device *data, size_t size)
1321 return snd_pcm_set_managed_buffer_all(pcm, type, data, size, 0);
1324 int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream,
1325 size_t size, gfp_t gfp_flags);
1326 int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream);
1327 struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream,
1328 unsigned long offset);
1330 * snd_pcm_lib_alloc_vmalloc_buffer - allocate virtual DMA buffer
1331 * @substream: the substream to allocate the buffer to
1332 * @size: the requested buffer size, in bytes
1334 * Allocates the PCM substream buffer using vmalloc(), i.e., the memory is
1335 * contiguous in kernel virtual space, but not in physical memory. Use this
1336 * if the buffer is accessed by kernel code but not by device DMA.
1338 * Return: 1 if the buffer was changed, 0 if not changed, or a negative error
1341 static inline int snd_pcm_lib_alloc_vmalloc_buffer
1342 (struct snd_pcm_substream *substream, size_t size)
1344 return _snd_pcm_lib_alloc_vmalloc_buffer(substream, size,
1345 GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
1349 * snd_pcm_lib_alloc_vmalloc_32_buffer - allocate 32-bit-addressable buffer
1350 * @substream: the substream to allocate the buffer to
1351 * @size: the requested buffer size, in bytes
1353 * This function works like snd_pcm_lib_alloc_vmalloc_buffer(), but uses
1354 * vmalloc_32(), i.e., the pages are allocated from 32-bit-addressable memory.
1356 * Return: 1 if the buffer was changed, 0 if not changed, or a negative error
1359 static inline int snd_pcm_lib_alloc_vmalloc_32_buffer
1360 (struct snd_pcm_substream *substream, size_t size)
1362 return _snd_pcm_lib_alloc_vmalloc_buffer(substream, size,
1363 GFP_KERNEL | GFP_DMA32 | __GFP_ZERO);
1366 #define snd_pcm_get_dma_buf(substream) ((substream)->runtime->dma_buffer_p)
1369 * snd_pcm_sgbuf_get_addr - Get the DMA address at the corresponding offset
1370 * @substream: PCM substream
1373 * Return: DMA address
1375 static inline dma_addr_t
1376 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
1378 return snd_sgbuf_get_addr(snd_pcm_get_dma_buf(substream), ofs);
1382 * snd_pcm_sgbuf_get_chunk_size - Compute the max size that fits within the
1383 * contig. page from the given size
1384 * @substream: PCM substream
1386 * @size: byte size to examine
1388 * Return: chunk size
1390 static inline unsigned int
1391 snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
1392 unsigned int ofs, unsigned int size)
1394 return snd_sgbuf_get_chunk_size(snd_pcm_get_dma_buf(substream), ofs, size);
1398 * snd_pcm_mmap_data_open - increase the mmap counter
1401 * PCM mmap callback should handle this counter properly
1403 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
1405 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1406 atomic_inc(&substream->mmap_count);
1410 * snd_pcm_mmap_data_close - decrease the mmap counter
1413 * PCM mmap callback should handle this counter properly
1415 static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
1417 struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data;
1418 atomic_dec(&substream->mmap_count);
1421 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
1422 struct vm_area_struct *area);
1423 /* mmap for io-memory area */
1424 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
1425 #define SNDRV_PCM_INFO_MMAP_IOMEM SNDRV_PCM_INFO_MMAP
1426 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area);
1428 #define SNDRV_PCM_INFO_MMAP_IOMEM 0
1429 #define snd_pcm_lib_mmap_iomem NULL
1433 * snd_pcm_limit_isa_dma_size - Get the max size fitting with ISA DMA transfer
1435 * @max: pointer to store the max size
1437 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
1439 *max = dma < 4 ? 64 * 1024 : 128 * 1024;
1446 #define SNDRV_PCM_DEFAULT_CON_SPDIF (IEC958_AES0_CON_EMPHASIS_NONE|\
1447 (IEC958_AES1_CON_ORIGINAL<<8)|\
1448 (IEC958_AES1_CON_PCM_CODER<<8)|\
1449 (IEC958_AES3_CON_FS_48000<<24))
1451 const char *snd_pcm_format_name(snd_pcm_format_t format);
1454 * snd_pcm_direction_name - Get a string naming the direction of a stream
1455 * @direction: Stream's direction, one of SNDRV_PCM_STREAM_XXX
1457 * Returns a string naming the direction of the stream.
1459 static inline const char *snd_pcm_direction_name(int direction)
1461 if (direction == SNDRV_PCM_STREAM_PLAYBACK)
1468 * snd_pcm_stream_str - Get a string naming the direction of a stream
1469 * @substream: the pcm substream instance
1471 * Return: A string naming the direction of the stream.
1473 static inline const char *snd_pcm_stream_str(struct snd_pcm_substream *substream)
1475 return snd_pcm_direction_name(substream->stream);
1479 * PCM channel-mapping control API
1481 /* array element of channel maps */
1482 struct snd_pcm_chmap_elem {
1483 unsigned char channels;
1484 unsigned char map[15];
1487 /* channel map information; retrieved via snd_kcontrol_chip() */
1488 struct snd_pcm_chmap {
1489 struct snd_pcm *pcm; /* assigned PCM instance */
1490 int stream; /* PLAYBACK or CAPTURE */
1491 struct snd_kcontrol *kctl;
1492 const struct snd_pcm_chmap_elem *chmap;
1493 unsigned int max_channels;
1494 unsigned int channel_mask; /* optional: active channels bitmask */
1495 void *private_data; /* optional: private data pointer */
1499 * snd_pcm_chmap_substream - get the PCM substream assigned to the given chmap info
1500 * @info: chmap information
1501 * @idx: the substream number index
1503 * Return: the matched PCM substream, or NULL if not found
1505 static inline struct snd_pcm_substream *
1506 snd_pcm_chmap_substream(struct snd_pcm_chmap *info, unsigned int idx)
1508 struct snd_pcm_substream *s;
1509 for (s = info->pcm->streams[info->stream].substream; s; s = s->next)
1510 if (s->number == idx)
1515 /* ALSA-standard channel maps (RL/RR prior to C/LFE) */
1516 extern const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[];
1517 /* Other world's standard channel maps (C/LFE prior to RL/RR) */
1518 extern const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[];
1520 /* bit masks to be passed to snd_pcm_chmap.channel_mask field */
1521 #define SND_PCM_CHMAP_MASK_24 ((1U << 2) | (1U << 4))
1522 #define SND_PCM_CHMAP_MASK_246 (SND_PCM_CHMAP_MASK_24 | (1U << 6))
1523 #define SND_PCM_CHMAP_MASK_2468 (SND_PCM_CHMAP_MASK_246 | (1U << 8))
1525 int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
1526 const struct snd_pcm_chmap_elem *chmap,
1528 unsigned long private_value,
1529 struct snd_pcm_chmap **info_ret);
1532 * pcm_format_to_bits - Strong-typed conversion of pcm_format to bitwise
1533 * @pcm_format: PCM format
1535 * Return: 64bit mask corresponding to the given PCM format
1537 static inline u64 pcm_format_to_bits(snd_pcm_format_t pcm_format)
1539 return 1ULL << (__force int) pcm_format;
1543 * pcm_for_each_format - helper to iterate for each format type
1544 * @f: the iterator variable in snd_pcm_format_t type
1546 #define pcm_for_each_format(f) \
1547 for ((f) = SNDRV_PCM_FORMAT_FIRST; \
1548 (__force int)(f) <= (__force int)SNDRV_PCM_FORMAT_LAST; \
1549 (f) = (__force snd_pcm_format_t)((__force int)(f) + 1))
1551 /* printk helpers */
1552 #define pcm_err(pcm, fmt, args...) \
1553 dev_err((pcm)->card->dev, fmt, ##args)
1554 #define pcm_warn(pcm, fmt, args...) \
1555 dev_warn((pcm)->card->dev, fmt, ##args)
1556 #define pcm_dbg(pcm, fmt, args...) \
1557 dev_dbg((pcm)->card->dev, fmt, ##args)
1559 struct snd_pcm_status64 {
1560 snd_pcm_state_t state; /* stream state */
1562 s64 trigger_tstamp_sec; /* time when stream was started/stopped/paused */
1563 s64 trigger_tstamp_nsec;
1564 s64 tstamp_sec; /* reference timestamp */
1566 snd_pcm_uframes_t appl_ptr; /* appl ptr */
1567 snd_pcm_uframes_t hw_ptr; /* hw ptr */
1568 snd_pcm_sframes_t delay; /* current delay in frames */
1569 snd_pcm_uframes_t avail; /* number of frames available */
1570 snd_pcm_uframes_t avail_max; /* max frames available on hw since last status */
1571 snd_pcm_uframes_t overrange; /* count of ADC (capture) overrange detections from last status */
1572 snd_pcm_state_t suspended_state; /* suspended stream state */
1573 __u32 audio_tstamp_data; /* needed for 64-bit alignment, used for configs/report to/from userspace */
1574 s64 audio_tstamp_sec; /* sample counter, wall clock, PHC or on-demand sync'ed */
1575 s64 audio_tstamp_nsec;
1576 s64 driver_tstamp_sec; /* useful in case reference system tstamp is reported with delay */
1577 s64 driver_tstamp_nsec;
1578 __u32 audio_tstamp_accuracy; /* in ns units, only valid if indicated in audio_tstamp_data */
1579 unsigned char reserved[52-4*sizeof(s64)]; /* must be filled with zero */
1582 #define SNDRV_PCM_IOCTL_STATUS64 _IOR('A', 0x20, struct snd_pcm_status64)
1583 #define SNDRV_PCM_IOCTL_STATUS_EXT64 _IOWR('A', 0x24, struct snd_pcm_status64)
1585 struct snd_pcm_status32 {
1586 snd_pcm_state_t state; /* stream state */
1587 s32 trigger_tstamp_sec; /* time when stream was started/stopped/paused */
1588 s32 trigger_tstamp_nsec;
1589 s32 tstamp_sec; /* reference timestamp */
1591 u32 appl_ptr; /* appl ptr */
1592 u32 hw_ptr; /* hw ptr */
1593 s32 delay; /* current delay in frames */
1594 u32 avail; /* number of frames available */
1595 u32 avail_max; /* max frames available on hw since last status */
1596 u32 overrange; /* count of ADC (capture) overrange detections from last status */
1597 snd_pcm_state_t suspended_state; /* suspended stream state */
1598 u32 audio_tstamp_data; /* needed for 64-bit alignment, used for configs/report to/from userspace */
1599 s32 audio_tstamp_sec; /* sample counter, wall clock, PHC or on-demand sync'ed */
1600 s32 audio_tstamp_nsec;
1601 s32 driver_tstamp_sec; /* useful in case reference system tstamp is reported with delay */
1602 s32 driver_tstamp_nsec;
1603 u32 audio_tstamp_accuracy; /* in ns units, only valid if indicated in audio_tstamp_data */
1604 unsigned char reserved[52-4*sizeof(s32)]; /* must be filled with zero */
1607 #define SNDRV_PCM_IOCTL_STATUS32 _IOR('A', 0x20, struct snd_pcm_status32)
1608 #define SNDRV_PCM_IOCTL_STATUS_EXT32 _IOWR('A', 0x24, struct snd_pcm_status32)
1610 #endif /* __SOUND_PCM_H */