diff options
Diffstat (limited to 'include/sound/pcm.h')
| -rw-r--r-- | include/sound/pcm.h | 1610 |
1 files changed, 1610 insertions, 0 deletions
diff --git a/include/sound/pcm.h b/include/sound/pcm.h new file mode 100644 index 000000000..27040b472 --- /dev/null +++ b/include/sound/pcm.h @@ -0,0 +1,1610 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +#ifndef __SOUND_PCM_H +#define __SOUND_PCM_H + +/* + * Digital Audio (PCM) abstract layer + * Copyright (c) by Jaroslav Kysela <perex@perex.cz> + * Abramo Bagnara <abramo@alsa-project.org> + */ + +#include <sound/asound.h> +#include <sound/memalloc.h> +#include <sound/minors.h> +#include <linux/poll.h> +#include <linux/mm.h> +#include <linux/bitops.h> +#include <linux/pm_qos.h> +#include <linux/refcount.h> + +#define snd_pcm_substream_chip(substream) ((substream)->private_data) +#define snd_pcm_chip(pcm) ((pcm)->private_data) + +#if IS_ENABLED(CONFIG_SND_PCM_OSS) +#include <sound/pcm_oss.h> +#endif + +/* + * Hardware (lowlevel) section + */ + +struct snd_pcm_hardware { + unsigned int info; /* SNDRV_PCM_INFO_* */ + u64 formats; /* SNDRV_PCM_FMTBIT_* */ + unsigned int rates; /* SNDRV_PCM_RATE_* */ + unsigned int rate_min; /* min rate */ + unsigned int rate_max; /* max rate */ + unsigned int channels_min; /* min channels */ + unsigned int channels_max; /* max channels */ + size_t buffer_bytes_max; /* max buffer size */ + size_t period_bytes_min; /* min period size */ + size_t period_bytes_max; /* max period size */ + unsigned int periods_min; /* min # of periods */ + unsigned int periods_max; /* max # of periods */ + size_t fifo_size; /* fifo size in bytes */ +}; + +struct snd_pcm_status64; +struct snd_pcm_substream; + +struct snd_pcm_audio_tstamp_config; /* definitions further down */ +struct snd_pcm_audio_tstamp_report; + +struct snd_pcm_ops { + int (*open)(struct snd_pcm_substream *substream); + int (*close)(struct snd_pcm_substream *substream); + int (*ioctl)(struct snd_pcm_substream * substream, + unsigned int cmd, void *arg); + int (*hw_params)(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params); + int (*hw_free)(struct snd_pcm_substream *substream); + int (*prepare)(struct snd_pcm_substream *substream); + int (*trigger)(struct snd_pcm_substream *substream, int cmd); + int (*sync_stop)(struct snd_pcm_substream *substream); + snd_pcm_uframes_t (*pointer)(struct snd_pcm_substream *substream); + int (*get_time_info)(struct snd_pcm_substream *substream, + struct timespec64 *system_ts, struct timespec64 *audio_ts, + struct snd_pcm_audio_tstamp_config *audio_tstamp_config, + struct snd_pcm_audio_tstamp_report *audio_tstamp_report); + int (*fill_silence)(struct snd_pcm_substream *substream, int channel, + unsigned long pos, unsigned long bytes); + int (*copy_user)(struct snd_pcm_substream *substream, int channel, + unsigned long pos, void __user *buf, + unsigned long bytes); + int (*copy_kernel)(struct snd_pcm_substream *substream, int channel, + unsigned long pos, void *buf, unsigned long bytes); + struct page *(*page)(struct snd_pcm_substream *substream, + unsigned long offset); + int (*mmap)(struct snd_pcm_substream *substream, struct vm_area_struct *vma); + int (*ack)(struct snd_pcm_substream *substream); +}; + +/* + * + */ + +#if defined(CONFIG_SND_DYNAMIC_MINORS) +#define SNDRV_PCM_DEVICES (SNDRV_OS_MINORS-2) +#else +#define SNDRV_PCM_DEVICES 8 +#endif + +#define SNDRV_PCM_IOCTL1_RESET 0 +/* 1 is absent slot. */ +#define SNDRV_PCM_IOCTL1_CHANNEL_INFO 2 +/* 3 is absent slot. */ +#define SNDRV_PCM_IOCTL1_FIFO_SIZE 4 + +#define SNDRV_PCM_TRIGGER_STOP 0 +#define SNDRV_PCM_TRIGGER_START 1 +#define SNDRV_PCM_TRIGGER_PAUSE_PUSH 3 +#define SNDRV_PCM_TRIGGER_PAUSE_RELEASE 4 +#define SNDRV_PCM_TRIGGER_SUSPEND 5 +#define SNDRV_PCM_TRIGGER_RESUME 6 +#define SNDRV_PCM_TRIGGER_DRAIN 7 + +#define SNDRV_PCM_POS_XRUN ((snd_pcm_uframes_t)-1) + +/* If you change this don't forget to change rates[] table in pcm_native.c */ +#define SNDRV_PCM_RATE_5512 (1U<<0) /* 5512Hz */ +#define SNDRV_PCM_RATE_8000 (1U<<1) /* 8000Hz */ +#define SNDRV_PCM_RATE_11025 (1U<<2) /* 11025Hz */ +#define SNDRV_PCM_RATE_16000 (1U<<3) /* 16000Hz */ +#define SNDRV_PCM_RATE_22050 (1U<<4) /* 22050Hz */ +#define SNDRV_PCM_RATE_32000 (1U<<5) /* 32000Hz */ +#define SNDRV_PCM_RATE_44100 (1U<<6) /* 44100Hz */ +#define SNDRV_PCM_RATE_48000 (1U<<7) /* 48000Hz */ +#define SNDRV_PCM_RATE_64000 (1U<<8) /* 64000Hz */ +#define SNDRV_PCM_RATE_88200 (1U<<9) /* 88200Hz */ +#define SNDRV_PCM_RATE_96000 (1U<<10) /* 96000Hz */ +#define SNDRV_PCM_RATE_176400 (1U<<11) /* 176400Hz */ +#define SNDRV_PCM_RATE_192000 (1U<<12) /* 192000Hz */ +#define SNDRV_PCM_RATE_352800 (1U<<13) /* 352800Hz */ +#define SNDRV_PCM_RATE_384000 (1U<<14) /* 384000Hz */ + +#define SNDRV_PCM_RATE_CONTINUOUS (1U<<30) /* continuous range */ +#define SNDRV_PCM_RATE_KNOT (1U<<31) /* supports more non-continuos rates */ + +#define SNDRV_PCM_RATE_8000_44100 (SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_11025|\ + SNDRV_PCM_RATE_16000|SNDRV_PCM_RATE_22050|\ + SNDRV_PCM_RATE_32000|SNDRV_PCM_RATE_44100) +#define SNDRV_PCM_RATE_8000_48000 (SNDRV_PCM_RATE_8000_44100|SNDRV_PCM_RATE_48000) +#define SNDRV_PCM_RATE_8000_96000 (SNDRV_PCM_RATE_8000_48000|SNDRV_PCM_RATE_64000|\ + SNDRV_PCM_RATE_88200|SNDRV_PCM_RATE_96000) +#define SNDRV_PCM_RATE_8000_192000 (SNDRV_PCM_RATE_8000_96000|SNDRV_PCM_RATE_176400|\ + SNDRV_PCM_RATE_192000) +#define SNDRV_PCM_RATE_8000_384000 (SNDRV_PCM_RATE_8000_192000|\ + SNDRV_PCM_RATE_352800|\ + SNDRV_PCM_RATE_384000) +#define _SNDRV_PCM_FMTBIT(fmt) (1ULL << (__force int)SNDRV_PCM_FORMAT_##fmt) +#define SNDRV_PCM_FMTBIT_S8 _SNDRV_PCM_FMTBIT(S8) +#define SNDRV_PCM_FMTBIT_U8 _SNDRV_PCM_FMTBIT(U8) +#define SNDRV_PCM_FMTBIT_S16_LE _SNDRV_PCM_FMTBIT(S16_LE) +#define SNDRV_PCM_FMTBIT_S16_BE _SNDRV_PCM_FMTBIT(S16_BE) +#define SNDRV_PCM_FMTBIT_U16_LE _SNDRV_PCM_FMTBIT(U16_LE) +#define SNDRV_PCM_FMTBIT_U16_BE _SNDRV_PCM_FMTBIT(U16_BE) +#define SNDRV_PCM_FMTBIT_S24_LE _SNDRV_PCM_FMTBIT(S24_LE) +#define SNDRV_PCM_FMTBIT_S24_BE _SNDRV_PCM_FMTBIT(S24_BE) +#define SNDRV_PCM_FMTBIT_U24_LE _SNDRV_PCM_FMTBIT(U24_LE) +#define SNDRV_PCM_FMTBIT_U24_BE _SNDRV_PCM_FMTBIT(U24_BE) +// For S32/U32 formats, 'msbits' hardware parameter is often used to deliver information about the +// available bit count in most significant bit. It's for the case of so-called 'left-justified' or +// `right-padding` sample which has less width than 32 bit. +#define SNDRV_PCM_FMTBIT_S32_LE _SNDRV_PCM_FMTBIT(S32_LE) +#define SNDRV_PCM_FMTBIT_S32_BE _SNDRV_PCM_FMTBIT(S32_BE) +#define SNDRV_PCM_FMTBIT_U32_LE _SNDRV_PCM_FMTBIT(U32_LE) +#define SNDRV_PCM_FMTBIT_U32_BE _SNDRV_PCM_FMTBIT(U32_BE) +#define SNDRV_PCM_FMTBIT_FLOAT_LE _SNDRV_PCM_FMTBIT(FLOAT_LE) +#define SNDRV_PCM_FMTBIT_FLOAT_BE _SNDRV_PCM_FMTBIT(FLOAT_BE) +#define SNDRV_PCM_FMTBIT_FLOAT64_LE _SNDRV_PCM_FMTBIT(FLOAT64_LE) +#define SNDRV_PCM_FMTBIT_FLOAT64_BE _SNDRV_PCM_FMTBIT(FLOAT64_BE) +#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_LE) +#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE _SNDRV_PCM_FMTBIT(IEC958_SUBFRAME_BE) +#define SNDRV_PCM_FMTBIT_MU_LAW _SNDRV_PCM_FMTBIT(MU_LAW) +#define SNDRV_PCM_FMTBIT_A_LAW _SNDRV_PCM_FMTBIT(A_LAW) +#define SNDRV_PCM_FMTBIT_IMA_ADPCM _SNDRV_PCM_FMTBIT(IMA_ADPCM) +#define SNDRV_PCM_FMTBIT_MPEG _SNDRV_PCM_FMTBIT(MPEG) +#define SNDRV_PCM_FMTBIT_GSM _SNDRV_PCM_FMTBIT(GSM) +#define SNDRV_PCM_FMTBIT_S20_LE _SNDRV_PCM_FMTBIT(S20_LE) +#define SNDRV_PCM_FMTBIT_U20_LE _SNDRV_PCM_FMTBIT(U20_LE) +#define SNDRV_PCM_FMTBIT_S20_BE _SNDRV_PCM_FMTBIT(S20_BE) +#define SNDRV_PCM_FMTBIT_U20_BE _SNDRV_PCM_FMTBIT(U20_BE) +#define SNDRV_PCM_FMTBIT_SPECIAL _SNDRV_PCM_FMTBIT(SPECIAL) +#define SNDRV_PCM_FMTBIT_S24_3LE _SNDRV_PCM_FMTBIT(S24_3LE) +#define SNDRV_PCM_FMTBIT_U24_3LE _SNDRV_PCM_FMTBIT(U24_3LE) +#define SNDRV_PCM_FMTBIT_S24_3BE _SNDRV_PCM_FMTBIT(S24_3BE) +#define SNDRV_PCM_FMTBIT_U24_3BE _SNDRV_PCM_FMTBIT(U24_3BE) +#define SNDRV_PCM_FMTBIT_S20_3LE _SNDRV_PCM_FMTBIT(S20_3LE) +#define SNDRV_PCM_FMTBIT_U20_3LE _SNDRV_PCM_FMTBIT(U20_3LE) +#define SNDRV_PCM_FMTBIT_S20_3BE _SNDRV_PCM_FMTBIT(S20_3BE) +#define SNDRV_PCM_FMTBIT_U20_3BE _SNDRV_PCM_FMTBIT(U20_3BE) +#define SNDRV_PCM_FMTBIT_S18_3LE _SNDRV_PCM_FMTBIT(S18_3LE) +#define SNDRV_PCM_FMTBIT_U18_3LE _SNDRV_PCM_FMTBIT(U18_3LE) +#define SNDRV_PCM_FMTBIT_S18_3BE _SNDRV_PCM_FMTBIT(S18_3BE) +#define SNDRV_PCM_FMTBIT_U18_3BE _SNDRV_PCM_FMTBIT(U18_3BE) +#define SNDRV_PCM_FMTBIT_G723_24 _SNDRV_PCM_FMTBIT(G723_24) +#define SNDRV_PCM_FMTBIT_G723_24_1B _SNDRV_PCM_FMTBIT(G723_24_1B) +#define SNDRV_PCM_FMTBIT_G723_40 _SNDRV_PCM_FMTBIT(G723_40) +#define SNDRV_PCM_FMTBIT_G723_40_1B _SNDRV_PCM_FMTBIT(G723_40_1B) +#define SNDRV_PCM_FMTBIT_DSD_U8 _SNDRV_PCM_FMTBIT(DSD_U8) +#define SNDRV_PCM_FMTBIT_DSD_U16_LE _SNDRV_PCM_FMTBIT(DSD_U16_LE) +#define SNDRV_PCM_FMTBIT_DSD_U32_LE _SNDRV_PCM_FMTBIT(DSD_U32_LE) +#define SNDRV_PCM_FMTBIT_DSD_U16_BE _SNDRV_PCM_FMTBIT(DSD_U16_BE) +#define SNDRV_PCM_FMTBIT_DSD_U32_BE _SNDRV_PCM_FMTBIT(DSD_U32_BE) + +#ifdef SNDRV_LITTLE_ENDIAN +#define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_LE +#define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_LE +#define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_LE +#define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_LE +#define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_LE +#define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_LE +#define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_LE +#define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_LE +#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE +#define SNDRV_PCM_FMTBIT_S20 SNDRV_PCM_FMTBIT_S20_LE +#define SNDRV_PCM_FMTBIT_U20 SNDRV_PCM_FMTBIT_U20_LE +#endif +#ifdef SNDRV_BIG_ENDIAN +#define SNDRV_PCM_FMTBIT_S16 SNDRV_PCM_FMTBIT_S16_BE +#define SNDRV_PCM_FMTBIT_U16 SNDRV_PCM_FMTBIT_U16_BE +#define SNDRV_PCM_FMTBIT_S24 SNDRV_PCM_FMTBIT_S24_BE +#define SNDRV_PCM_FMTBIT_U24 SNDRV_PCM_FMTBIT_U24_BE +#define SNDRV_PCM_FMTBIT_S32 SNDRV_PCM_FMTBIT_S32_BE +#define SNDRV_PCM_FMTBIT_U32 SNDRV_PCM_FMTBIT_U32_BE +#define SNDRV_PCM_FMTBIT_FLOAT SNDRV_PCM_FMTBIT_FLOAT_BE +#define SNDRV_PCM_FMTBIT_FLOAT64 SNDRV_PCM_FMTBIT_FLOAT64_BE +#define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE +#define SNDRV_PCM_FMTBIT_S20 SNDRV_PCM_FMTBIT_S20_BE +#define SNDRV_PCM_FMTBIT_U20 SNDRV_PCM_FMTBIT_U20_BE +#endif + +struct snd_pcm_file { + struct snd_pcm_substream *substream; + int no_compat_mmap; + unsigned int user_pversion; /* supported protocol version */ +}; + +struct snd_pcm_hw_rule; +typedef int (*snd_pcm_hw_rule_func_t)(struct snd_pcm_hw_params *params, + struct snd_pcm_hw_rule *rule); + +struct snd_pcm_hw_rule { + unsigned int cond; + int var; + int deps[5]; + + snd_pcm_hw_rule_func_t func; + void *private; +}; + +struct snd_pcm_hw_constraints { + struct snd_mask masks[SNDRV_PCM_HW_PARAM_LAST_MASK - + SNDRV_PCM_HW_PARAM_FIRST_MASK + 1]; + struct snd_interval intervals[SNDRV_PCM_HW_PARAM_LAST_INTERVAL - + SNDRV_PCM_HW_PARAM_FIRST_INTERVAL + 1]; + unsigned int rules_num; + unsigned int rules_all; + struct snd_pcm_hw_rule *rules; +}; + +static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs, + snd_pcm_hw_param_t var) +{ + return &constrs->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK]; +} + +static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs, + snd_pcm_hw_param_t var) +{ + return &constrs->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL]; +} + +struct snd_ratnum { + unsigned int num; + unsigned int den_min, den_max, den_step; +}; + +struct snd_ratden { + unsigned int num_min, num_max, num_step; + unsigned int den; +}; + +struct snd_pcm_hw_constraint_ratnums { + int nrats; + const struct snd_ratnum *rats; +}; + +struct snd_pcm_hw_constraint_ratdens { + int nrats; + const struct snd_ratden *rats; +}; + +struct snd_pcm_hw_constraint_list { + const unsigned int *list; + unsigned int count; + unsigned int mask; +}; + +struct snd_pcm_hw_constraint_ranges { + unsigned int count; + const struct snd_interval *ranges; + unsigned int mask; +}; + +/* + * userspace-provided audio timestamp config to kernel, + * structure is for internal use only and filled with dedicated unpack routine + */ +struct snd_pcm_audio_tstamp_config { + /* 5 of max 16 bits used */ + u32 type_requested:4; + u32 report_delay:1; /* add total delay to A/D or D/A */ +}; + +static inline void snd_pcm_unpack_audio_tstamp_config(__u32 data, + struct snd_pcm_audio_tstamp_config *config) +{ + config->type_requested = data & 0xF; + config->report_delay = (data >> 4) & 1; +} + +/* + * kernel-provided audio timestamp report to user-space + * structure is for internal use only and read by dedicated pack routine + */ +struct snd_pcm_audio_tstamp_report { + /* 6 of max 16 bits used for bit-fields */ + + /* for backwards compatibility */ + u32 valid:1; + + /* actual type if hardware could not support requested timestamp */ + u32 actual_type:4; + + /* accuracy represented in ns units */ + u32 accuracy_report:1; /* 0 if accuracy unknown, 1 if accuracy field is valid */ + u32 accuracy; /* up to 4.29s, will be packed in separate field */ +}; + +static inline void snd_pcm_pack_audio_tstamp_report(__u32 *data, __u32 *accuracy, + const struct snd_pcm_audio_tstamp_report *report) +{ + u32 tmp; + + tmp = report->accuracy_report; + tmp <<= 4; + tmp |= report->actual_type; + tmp <<= 1; + tmp |= report->valid; + + *data &= 0xffff; /* zero-clear MSBs */ + *data |= (tmp << 16); + *accuracy = report->accuracy; +} + + +struct snd_pcm_runtime { + /* -- Status -- */ + snd_pcm_state_t state; /* stream state */ + snd_pcm_state_t suspended_state; /* suspended stream state */ + struct snd_pcm_substream *trigger_master; + struct timespec64 trigger_tstamp; /* trigger timestamp */ + bool trigger_tstamp_latched; /* trigger timestamp latched in low-level driver/hardware */ + int overrange; + snd_pcm_uframes_t avail_max; + snd_pcm_uframes_t hw_ptr_base; /* Position at buffer restart */ + snd_pcm_uframes_t hw_ptr_interrupt; /* Position at interrupt time */ + unsigned long hw_ptr_jiffies; /* Time when hw_ptr is updated */ + unsigned long hw_ptr_buffer_jiffies; /* buffer time in jiffies */ + snd_pcm_sframes_t delay; /* extra delay; typically FIFO size */ + u64 hw_ptr_wrap; /* offset for hw_ptr due to boundary wrap-around */ + + /* -- HW params -- */ + snd_pcm_access_t access; /* access mode */ + snd_pcm_format_t format; /* SNDRV_PCM_FORMAT_* */ + snd_pcm_subformat_t subformat; /* subformat */ + unsigned int rate; /* rate in Hz */ + unsigned int channels; /* channels */ + snd_pcm_uframes_t period_size; /* period size */ + unsigned int periods; /* periods */ + snd_pcm_uframes_t buffer_size; /* buffer size */ + snd_pcm_uframes_t min_align; /* Min alignment for the format */ + size_t byte_align; + unsigned int frame_bits; + unsigned int sample_bits; + unsigned int info; + unsigned int rate_num; + unsigned int rate_den; + unsigned int no_period_wakeup: 1; + + /* -- SW params -- */ + int tstamp_mode; /* mmap timestamp is updated */ + unsigned int period_step; + snd_pcm_uframes_t start_threshold; + snd_pcm_uframes_t stop_threshold; + snd_pcm_uframes_t silence_threshold; /* Silence filling happens when + noise is nearest than this */ + snd_pcm_uframes_t silence_size; /* Silence filling size */ + snd_pcm_uframes_t boundary; /* pointers wrap point */ + + snd_pcm_uframes_t silence_start; /* starting pointer to silence area */ + snd_pcm_uframes_t silence_filled; /* size filled with silence */ + + union snd_pcm_sync_id sync; /* hardware synchronization ID */ + + /* -- mmap -- */ + struct snd_pcm_mmap_status *status; + struct snd_pcm_mmap_control *control; + + /* -- locking / scheduling -- */ + snd_pcm_uframes_t twake; /* do transfer (!poll) wakeup if non-zero */ + wait_queue_head_t sleep; /* poll sleep */ + wait_queue_head_t tsleep; /* transfer sleep */ + struct snd_fasync *fasync; + bool stop_operating; /* sync_stop will be called */ + struct mutex buffer_mutex; /* protect for buffer changes */ + atomic_t buffer_accessing; /* >0: in r/w operation, <0: blocked */ + + /* -- private section -- */ + void *private_data; + void (*private_free)(struct snd_pcm_runtime *runtime); + + /* -- hardware description -- */ + struct snd_pcm_hardware hw; + struct snd_pcm_hw_constraints hw_constraints; + + /* -- timer -- */ + unsigned int timer_resolution; /* timer resolution */ + int tstamp_type; /* timestamp type */ + + /* -- DMA -- */ + unsigned char *dma_area; /* DMA area */ + dma_addr_t dma_addr; /* physical bus address (not accessible from main CPU) */ + size_t dma_bytes; /* size of DMA area */ + + struct snd_dma_buffer *dma_buffer_p; /* allocated buffer */ + unsigned int buffer_changed:1; /* buffer allocation changed; set only in managed mode */ + + /* -- audio timestamp config -- */ + struct snd_pcm_audio_tstamp_config audio_tstamp_config; + struct snd_pcm_audio_tstamp_report audio_tstamp_report; + struct timespec64 driver_tstamp; + +#if IS_ENABLED(CONFIG_SND_PCM_OSS) + /* -- OSS things -- */ + struct snd_pcm_oss_runtime oss; +#endif +}; + +struct snd_pcm_group { /* keep linked substreams */ + spinlock_t lock; + struct mutex mutex; + struct list_head substreams; + refcount_t refs; +}; + +struct pid; + +struct snd_pcm_substream { + struct snd_pcm *pcm; + struct snd_pcm_str *pstr; + void *private_data; /* copied from pcm->private_data */ + int number; + char name[32]; /* substream name */ + int stream; /* stream (direction) */ + struct pm_qos_request latency_pm_qos_req; /* pm_qos request */ + size_t buffer_bytes_max; /* limit ring buffer size */ + struct snd_dma_buffer dma_buffer; + size_t dma_max; + /* -- hardware operations -- */ + const struct snd_pcm_ops *ops; + /* -- runtime information -- */ + struct snd_pcm_runtime *runtime; + /* -- timer section -- */ + struct snd_timer *timer; /* timer */ + unsigned timer_running: 1; /* time is running */ + long wait_time; /* time in ms for R/W to wait for avail */ + /* -- next substream -- */ + struct snd_pcm_substream *next; + /* -- linked substreams -- */ + struct list_head link_list; /* linked list member */ + struct snd_pcm_group self_group; /* fake group for non linked substream (with substream lock inside) */ + struct snd_pcm_group *group; /* pointer to current group */ + /* -- assigned files -- */ + int ref_count; + atomic_t mmap_count; + unsigned int f_flags; + void (*pcm_release)(struct snd_pcm_substream *); + struct pid *pid; +#if IS_ENABLED(CONFIG_SND_PCM_OSS) + /* -- OSS things -- */ + struct snd_pcm_oss_substream oss; +#endif +#ifdef CONFIG_SND_VERBOSE_PROCFS + struct snd_info_entry *proc_root; +#endif /* CONFIG_SND_VERBOSE_PROCFS */ + /* misc flags */ + unsigned int hw_opened: 1; + unsigned int managed_buffer_alloc:1; +}; + +#define SUBSTREAM_BUSY(substream) ((substream)->ref_count > 0) + + +struct snd_pcm_str { + int stream; /* stream (direction) */ + struct snd_pcm *pcm; + /* -- substreams -- */ + unsigned int substream_count; + unsigned int substream_opened; + struct snd_pcm_substream *substream; +#if IS_ENABLED(CONFIG_SND_PCM_OSS) + /* -- OSS things -- */ + struct snd_pcm_oss_stream oss; +#endif +#ifdef CONFIG_SND_VERBOSE_PROCFS + struct snd_info_entry *proc_root; +#ifdef CONFIG_SND_PCM_XRUN_DEBUG + unsigned int xrun_debug; /* 0 = disabled, 1 = verbose, 2 = stacktrace */ +#endif +#endif + struct snd_kcontrol *chmap_kctl; /* channel-mapping controls */ + struct device dev; +}; + +struct snd_pcm { + struct snd_card *card; + struct list_head list; + int device; /* device number */ + unsigned int info_flags; + unsigned short dev_class; + unsigned short dev_subclass; + char id[64]; + char name[80]; + struct snd_pcm_str streams[2]; + struct mutex open_mutex; + wait_queue_head_t open_wait; + void *private_data; + void (*private_free) (struct snd_pcm *pcm); + bool internal; /* pcm is for internal use only */ + bool nonatomic; /* whole PCM operations are in non-atomic context */ + bool no_device_suspend; /* don't invoke device PM suspend */ +#if IS_ENABLED(CONFIG_SND_PCM_OSS) + struct snd_pcm_oss oss; +#endif +}; + +/* + * Registering + */ + +extern const struct file_operations snd_pcm_f_ops[2]; + +int snd_pcm_new(struct snd_card *card, const char *id, int device, + int playback_count, int capture_count, + struct snd_pcm **rpcm); +int snd_pcm_new_internal(struct snd_card *card, const char *id, int device, + int playback_count, int capture_count, + struct snd_pcm **rpcm); +int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count); + +#if IS_ENABLED(CONFIG_SND_PCM_OSS) +struct snd_pcm_notify { + int (*n_register) (struct snd_pcm * pcm); + int (*n_disconnect) (struct snd_pcm * pcm); + int (*n_unregister) (struct snd_pcm * pcm); + struct list_head list; +}; +int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree); +#endif + +/* + * Native I/O + */ + +int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info); +int snd_pcm_info_user(struct snd_pcm_substream *substream, + struct snd_pcm_info __user *info); +int snd_pcm_status64(struct snd_pcm_substream *substream, + struct snd_pcm_status64 *status); +int snd_pcm_start(struct snd_pcm_substream *substream); +int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t status); +int snd_pcm_drain_done(struct snd_pcm_substream *substream); +int snd_pcm_stop_xrun(struct snd_pcm_substream *substream); +#ifdef CONFIG_PM +int snd_pcm_suspend_all(struct snd_pcm *pcm); +#else +static inline int snd_pcm_suspend_all(struct snd_pcm *pcm) +{ + return 0; +} +#endif +int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg); +int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file, + struct snd_pcm_substream **rsubstream); +void snd_pcm_release_substream(struct snd_pcm_substream *substream); +int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream, struct file *file, + struct snd_pcm_substream **rsubstream); +void snd_pcm_detach_substream(struct snd_pcm_substream *substream); +int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area); + + +#ifdef CONFIG_SND_DEBUG +void snd_pcm_debug_name(struct snd_pcm_substream *substream, + char *name, size_t len); +#else +static inline void +snd_pcm_debug_name(struct snd_pcm_substream *substream, char *buf, size_t size) +{ + *buf = 0; +} +#endif + +/* + * PCM library + */ + +/** + * snd_pcm_stream_linked - Check whether the substream is linked with others + * @substream: substream to check + * + * Return: true if the given substream is being linked with others + */ +static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream) +{ + return substream->group != &substream->self_group; +} + +void snd_pcm_stream_lock(struct snd_pcm_substream *substream); +void snd_pcm_stream_unlock(struct snd_pcm_substream *substream); +void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream); +void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream); +unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream); +unsigned long _snd_pcm_stream_lock_irqsave_nested(struct snd_pcm_substream *substream); + +/** + * snd_pcm_stream_lock_irqsave - Lock the PCM stream + * @substream: PCM substream + * @flags: irq flags + * + * This locks the PCM stream like snd_pcm_stream_lock() but with the local + * IRQ (only when nonatomic is false). In nonatomic case, this is identical + * as snd_pcm_stream_lock(). + */ +#define snd_pcm_stream_lock_irqsave(substream, flags) \ + do { \ + typecheck(unsigned long, flags); \ + flags = _snd_pcm_stream_lock_irqsave(substream); \ + } while (0) +void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream, + unsigned long flags); + +/** + * snd_pcm_stream_lock_irqsave_nested - Single-nested PCM stream locking + * @substream: PCM substream + * @flags: irq flags + * + * This locks the PCM stream like snd_pcm_stream_lock_irqsave() but with + * the single-depth lockdep subclass. + */ +#define snd_pcm_stream_lock_irqsave_nested(substream, flags) \ + do { \ + typecheck(unsigned long, flags); \ + flags = _snd_pcm_stream_lock_irqsave_nested(substream); \ + } while (0) + +/** + * snd_pcm_group_for_each_entry - iterate over the linked substreams + * @s: the iterator + * @substream: the substream + * + * Iterate over the all linked substreams to the given @substream. + * When @substream isn't linked with any others, this gives returns @substream + * itself once. + */ +#define snd_pcm_group_for_each_entry(s, substream) \ + list_for_each_entry(s, &substream->group->substreams, link_list) + +#define for_each_pcm_streams(stream) \ + for (stream = SNDRV_PCM_STREAM_PLAYBACK; \ + stream <= SNDRV_PCM_STREAM_LAST; \ + stream++) + +/** + * snd_pcm_running - Check whether the substream is in a running state + * @substream: substream to check + * + * Return: true if the given substream is in the state RUNNING, or in the + * state DRAINING for playback. + */ +static inline int snd_pcm_running(struct snd_pcm_substream *substream) +{ + return (substream->runtime->state == SNDRV_PCM_STATE_RUNNING || + (substream->runtime->state == SNDRV_PCM_STATE_DRAINING && + substream->stream == SNDRV_PCM_STREAM_PLAYBACK)); +} + +/** + * __snd_pcm_set_state - Change the current PCM state + * @runtime: PCM runtime to set + * @state: the current state to set + * + * Call within the stream lock + */ +static inline void __snd_pcm_set_state(struct snd_pcm_runtime *runtime, + snd_pcm_state_t state) +{ + runtime->state = state; + runtime->status->state = state; /* copy for mmap */ +} + +/** + * bytes_to_samples - Unit conversion of the size from bytes to samples + * @runtime: PCM runtime instance + * @size: size in bytes + * + * Return: the size in samples + */ +static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size) +{ + return size * 8 / runtime->sample_bits; +} + +/** + * bytes_to_frames - Unit conversion of the size from bytes to frames + * @runtime: PCM runtime instance + * @size: size in bytes + * + * Return: the size in frames + */ +static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size) +{ + return size * 8 / runtime->frame_bits; +} + +/** + * samples_to_bytes - Unit conversion of the size from samples to bytes + * @runtime: PCM runtime instance + * @size: size in samples + * + * Return: the byte size + */ +static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size) +{ + return size * runtime->sample_bits / 8; +} + +/** + * frames_to_bytes - Unit conversion of the size from frames to bytes + * @runtime: PCM runtime instance + * @size: size in frames + * + * Return: the byte size + */ +static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size) +{ + return size * runtime->frame_bits / 8; +} + +/** + * frame_aligned - Check whether the byte size is aligned to frames + * @runtime: PCM runtime instance + * @bytes: size in bytes + * + * Return: true if aligned, or false if not + */ +static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes) +{ + return bytes % runtime->byte_align == 0; +} + +/** + * snd_pcm_lib_buffer_bytes - Get the buffer size of the current PCM in bytes + * @substream: PCM substream + * + * Return: buffer byte size + */ +static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + return frames_to_bytes(runtime, runtime->buffer_size); +} + +/** + * snd_pcm_lib_period_bytes - Get the period size of the current PCM in bytes + * @substream: PCM substream + * + * Return: period byte size + */ +static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + return frames_to_bytes(runtime, runtime->period_size); +} + +/** + * snd_pcm_playback_avail - Get the available (writable) space for playback + * @runtime: PCM runtime instance + * + * Result is between 0 ... (boundary - 1) + * + * Return: available frame size + */ +static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime) +{ + snd_pcm_sframes_t avail = runtime->status->hw_ptr + runtime->buffer_size - runtime->control->appl_ptr; + if (avail < 0) + avail += runtime->boundary; + else if ((snd_pcm_uframes_t) avail >= runtime->boundary) + avail -= runtime->boundary; + return avail; +} + +/** + * snd_pcm_capture_avail - Get the available (readable) space for capture + * @runtime: PCM runtime instance + * + * Result is between 0 ... (boundary - 1) + * + * Return: available frame size + */ +static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime) +{ + snd_pcm_sframes_t avail = runtime->status->hw_ptr - runtime->control->appl_ptr; + if (avail < 0) + avail += runtime->boundary; + return avail; +} + +/** + * snd_pcm_playback_hw_avail - Get the queued space for playback + * @runtime: PCM runtime instance + * + * Return: available frame size + */ +static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime) +{ + return runtime->buffer_size - snd_pcm_playback_avail(runtime); +} + +/** + * snd_pcm_capture_hw_avail - Get the free space for capture + * @runtime: PCM runtime instance + * + * Return: available frame size + */ +static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime) +{ + return runtime->buffer_size - snd_pcm_capture_avail(runtime); +} + +/** + * snd_pcm_playback_ready - check whether the playback buffer is available + * @substream: the pcm substream instance + * + * Checks whether enough free space is available on the playback buffer. + * + * Return: Non-zero if available, or zero if not. + */ +static inline int snd_pcm_playback_ready(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + return snd_pcm_playback_avail(runtime) >= runtime->control->avail_min; +} + +/** + * snd_pcm_capture_ready - check whether the capture buffer is available + * @substream: the pcm substream instance + * + * Checks whether enough capture data is available on the capture buffer. + * + * Return: Non-zero if available, or zero if not. + */ +static inline int snd_pcm_capture_ready(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + return snd_pcm_capture_avail(runtime) >= runtime->control->avail_min; +} + +/** + * snd_pcm_playback_data - check whether any data exists on the playback buffer + * @substream: the pcm substream instance + * + * Checks whether any data exists on the playback buffer. + * + * Return: Non-zero if any data exists, or zero if not. If stop_threshold + * is bigger or equal to boundary, then this function returns always non-zero. + */ +static inline int snd_pcm_playback_data(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + + if (runtime->stop_threshold >= runtime->boundary) + return 1; + return snd_pcm_playback_avail(runtime) < runtime->buffer_size; +} + +/** + * snd_pcm_playback_empty - check whether the playback buffer is empty + * @substream: the pcm substream instance + * + * Checks whether the playback buffer is empty. + * + * Return: Non-zero if empty, or zero if not. + */ +static inline int snd_pcm_playback_empty(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + return snd_pcm_playback_avail(runtime) >= runtime->buffer_size; +} + +/** + * snd_pcm_capture_empty - check whether the capture buffer is empty + * @substream: the pcm substream instance + * + * Checks whether the capture buffer is empty. + * + * Return: Non-zero if empty, or zero if not. + */ +static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + return snd_pcm_capture_avail(runtime) == 0; +} + +/** + * snd_pcm_trigger_done - Mark the master substream + * @substream: the pcm substream instance + * @master: the linked master substream + * + * When multiple substreams of the same card are linked and the hardware + * supports the single-shot operation, the driver calls this in the loop + * in snd_pcm_group_for_each_entry() for marking the substream as "done". + * Then most of trigger operations are performed only to the given master + * substream. + * + * The trigger_master mark is cleared at timestamp updates at the end + * of trigger operations. + */ +static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream, + struct snd_pcm_substream *master) +{ + substream->runtime->trigger_master = master; +} + +static inline int hw_is_mask(int var) +{ + return var >= SNDRV_PCM_HW_PARAM_FIRST_MASK && + var <= SNDRV_PCM_HW_PARAM_LAST_MASK; +} + +static inline int hw_is_interval(int var) +{ + return var >= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL && + var <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; +} + +static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params, + snd_pcm_hw_param_t var) +{ + return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK]; +} + +static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params, + snd_pcm_hw_param_t var) +{ + return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL]; +} + +static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params, + snd_pcm_hw_param_t var) +{ + return ¶ms->masks[var - SNDRV_PCM_HW_PARAM_FIRST_MASK]; +} + +static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params, + snd_pcm_hw_param_t var) +{ + return ¶ms->intervals[var - SNDRV_PCM_HW_PARAM_FIRST_INTERVAL]; +} + +/** + * params_channels - Get the number of channels from the hw params + * @p: hw params + * + * Return: the number of channels + */ +static inline unsigned int params_channels(const struct snd_pcm_hw_params *p) +{ + return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_CHANNELS)->min; +} + +/** + * params_rate - Get the sample rate from the hw params + * @p: hw params + * + * Return: the sample rate + */ +static inline unsigned int params_rate(const struct snd_pcm_hw_params *p) +{ + return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_RATE)->min; +} + +/** + * params_period_size - Get the period size (in frames) from the hw params + * @p: hw params + * + * Return: the period size in frames + */ +static inline unsigned int params_period_size(const struct snd_pcm_hw_params *p) +{ + return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIOD_SIZE)->min; +} + +/** + * params_periods - Get the number of periods from the hw params + * @p: hw params + * + * Return: the number of periods + */ +static inline unsigned int params_periods(const struct snd_pcm_hw_params *p) +{ + return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_PERIODS)->min; +} + +/** + * params_buffer_size - Get the buffer size (in frames) from the hw params + * @p: hw params + * + * Return: the buffer size in frames + */ +static inline unsigned int params_buffer_size(const struct snd_pcm_hw_params *p) +{ + return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)->min; +} + +/** + * params_buffer_bytes - Get the buffer size (in bytes) from the hw params + * @p: hw params + * + * Return: the buffer size in bytes + */ +static inline unsigned int params_buffer_bytes(const struct snd_pcm_hw_params *p) +{ + return hw_param_interval_c(p, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)->min; +} + +int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v); +int snd_interval_list(struct snd_interval *i, unsigned int count, + const unsigned int *list, unsigned int mask); +int snd_interval_ranges(struct snd_interval *i, unsigned int count, + const struct snd_interval *list, unsigned int mask); +int snd_interval_ratnum(struct snd_interval *i, + unsigned int rats_count, const struct snd_ratnum *rats, + unsigned int *nump, unsigned int *denp); + +void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params); +void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var); + +int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params); + +int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, + u_int64_t mask); +int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, + unsigned int min, unsigned int max); +int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var); +int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime, + unsigned int cond, + snd_pcm_hw_param_t var, + const struct snd_pcm_hw_constraint_list *l); +int snd_pcm_hw_constraint_ranges(struct snd_pcm_runtime *runtime, + unsigned int cond, + snd_pcm_hw_param_t var, + const struct snd_pcm_hw_constraint_ranges *r); +int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime, + unsigned int cond, + snd_pcm_hw_param_t var, + const struct snd_pcm_hw_constraint_ratnums *r); +int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime, + unsigned int cond, + snd_pcm_hw_param_t var, + const struct snd_pcm_hw_constraint_ratdens *r); +int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime, + unsigned int cond, + unsigned int width, + unsigned int msbits); +int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime, + unsigned int cond, + snd_pcm_hw_param_t var, + unsigned long step); +int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime, + unsigned int cond, + snd_pcm_hw_param_t var); +int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime, + unsigned int base_rate); +int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, + unsigned int cond, + int var, + snd_pcm_hw_rule_func_t func, void *private, + int dep, ...); + +/** + * snd_pcm_hw_constraint_single() - Constrain parameter to a single value + * @runtime: PCM runtime instance + * @var: The hw_params variable to constrain + * @val: The value to constrain to + * + * Return: Positive if the value is changed, zero if it's not changed, or a + * negative error code. + */ +static inline int snd_pcm_hw_constraint_single( + struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, + unsigned int val) +{ + return snd_pcm_hw_constraint_minmax(runtime, var, val, val); +} + +int snd_pcm_format_signed(snd_pcm_format_t format); +int snd_pcm_format_unsigned(snd_pcm_format_t format); +int snd_pcm_format_linear(snd_pcm_format_t format); +int snd_pcm_format_little_endian(snd_pcm_format_t format); +int snd_pcm_format_big_endian(snd_pcm_format_t format); +#if 0 /* just for kernel-doc */ +/** + * snd_pcm_format_cpu_endian - Check the PCM format is CPU-endian + * @format: the format to check + * + * Return: 1 if the given PCM format is CPU-endian, 0 if + * opposite, or a negative error code if endian not specified. + */ +int snd_pcm_format_cpu_endian(snd_pcm_format_t format); +#endif /* DocBook */ +#ifdef SNDRV_LITTLE_ENDIAN +#define snd_pcm_format_cpu_endian(format) snd_pcm_format_little_endian(format) +#else +#define snd_pcm_format_cpu_endian(format) snd_pcm_format_big_endian(format) +#endif +int snd_pcm_format_width(snd_pcm_format_t format); /* in bits */ +int snd_pcm_format_physical_width(snd_pcm_format_t format); /* in bits */ +ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples); +const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format); +int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames); + +void snd_pcm_set_ops(struct snd_pcm * pcm, int direction, + const struct snd_pcm_ops *ops); +void snd_pcm_set_sync(struct snd_pcm_substream *substream); +int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream, + unsigned int cmd, void *arg); +void snd_pcm_period_elapsed_under_stream_lock(struct snd_pcm_substream *substream); +void snd_pcm_period_elapsed(struct snd_pcm_substream *substream); +snd_pcm_sframes_t __snd_pcm_lib_xfer(struct snd_pcm_substream *substream, + void *buf, bool interleaved, + snd_pcm_uframes_t frames, bool in_kernel); + +static inline snd_pcm_sframes_t +snd_pcm_lib_write(struct snd_pcm_substream *substream, + const void __user *buf, snd_pcm_uframes_t frames) +{ + return __snd_pcm_lib_xfer(substream, (void __force *)buf, true, frames, false); +} + +static inline snd_pcm_sframes_t +snd_pcm_lib_read(struct snd_pcm_substream *substream, + void __user *buf, snd_pcm_uframes_t frames) +{ + return __snd_pcm_lib_xfer(substream, (void __force *)buf, true, frames, false); +} + +static inline snd_pcm_sframes_t +snd_pcm_lib_writev(struct snd_pcm_substream *substream, + void __user **bufs, snd_pcm_uframes_t frames) +{ + return __snd_pcm_lib_xfer(substream, (void *)bufs, false, frames, false); +} + +static inline snd_pcm_sframes_t +snd_pcm_lib_readv(struct snd_pcm_substream *substream, + void __user **bufs, snd_pcm_uframes_t frames) +{ + return __snd_pcm_lib_xfer(substream, (void *)bufs, false, frames, false); +} + +static inline snd_pcm_sframes_t +snd_pcm_kernel_write(struct snd_pcm_substream *substream, + const void *buf, snd_pcm_uframes_t frames) +{ + return __snd_pcm_lib_xfer(substream, (void *)buf, true, frames, true); +} + +static inline snd_pcm_sframes_t +snd_pcm_kernel_read(struct snd_pcm_substream *substream, + void *buf, snd_pcm_uframes_t frames) +{ + return __snd_pcm_lib_xfer(substream, buf, true, frames, true); +} + +static inline snd_pcm_sframes_t +snd_pcm_kernel_writev(struct snd_pcm_substream *substream, + void **bufs, snd_pcm_uframes_t frames) +{ + return __snd_pcm_lib_xfer(substream, bufs, false, frames, true); +} + +static inline snd_pcm_sframes_t +snd_pcm_kernel_readv(struct snd_pcm_substream *substream, + void **bufs, snd_pcm_uframes_t frames) +{ + return __snd_pcm_lib_xfer(substream, bufs, false, frames, true); +} + +int snd_pcm_hw_limit_rates(struct snd_pcm_hardware *hw); + +static inline int +snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime) +{ + return snd_pcm_hw_limit_rates(&runtime->hw); +} + +unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate); +unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit); +unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a, + unsigned int rates_b); +unsigned int snd_pcm_rate_range_to_bits(unsigned int rate_min, + unsigned int rate_max); + +/** + * snd_pcm_set_runtime_buffer - Set the PCM runtime buffer + * @substream: PCM substream to set + * @bufp: the buffer information, NULL to clear + * + * Copy the buffer information to runtime->dma_buffer when @bufp is non-NULL. + * Otherwise it clears the current buffer information. + */ +static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream, + struct snd_dma_buffer *bufp) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + if (bufp) { + runtime->dma_buffer_p = bufp; + runtime->dma_area = bufp->area; + runtime->dma_addr = bufp->addr; + runtime->dma_bytes = bufp->bytes; + } else { + runtime->dma_buffer_p = NULL; + runtime->dma_area = NULL; + runtime->dma_addr = 0; + runtime->dma_bytes = 0; + } +} + +/** + * snd_pcm_gettime - Fill the timespec64 depending on the timestamp mode + * @runtime: PCM runtime instance + * @tv: timespec64 to fill + */ +static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime, + struct timespec64 *tv) +{ + switch (runtime->tstamp_type) { + case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC: + ktime_get_ts64(tv); + break; + case SNDRV_PCM_TSTAMP_TYPE_MONOTONIC_RAW: + ktime_get_raw_ts64(tv); + break; + default: + ktime_get_real_ts64(tv); + break; + } +} + +/* + * Memory + */ + +void snd_pcm_lib_preallocate_free(struct snd_pcm_substream *substream); +void snd_pcm_lib_preallocate_free_for_all(struct snd_pcm *pcm); +void snd_pcm_lib_preallocate_pages(struct snd_pcm_substream *substream, + int type, struct device *data, + size_t size, size_t max); +void snd_pcm_lib_preallocate_pages_for_all(struct snd_pcm *pcm, + int type, void *data, + size_t size, size_t max); +int snd_pcm_lib_malloc_pages(struct snd_pcm_substream *substream, size_t size); +int snd_pcm_lib_free_pages(struct snd_pcm_substream *substream); + +int snd_pcm_set_managed_buffer(struct snd_pcm_substream *substream, int type, + struct device *data, size_t size, size_t max); +int snd_pcm_set_managed_buffer_all(struct snd_pcm *pcm, int type, + struct device *data, + size_t size, size_t max); + +/** + * snd_pcm_set_fixed_buffer - Preallocate and set up the fixed size PCM buffer + * @substream: the pcm substream instance + * @type: DMA type (SNDRV_DMA_TYPE_*) + * @data: DMA type dependent data + * @size: the requested pre-allocation size in bytes + * + * This is a variant of snd_pcm_set_managed_buffer(), but this pre-allocates + * only the given sized buffer and doesn't allow re-allocation nor dynamic + * allocation of a larger buffer unlike the standard one. + * The function may return -ENOMEM error, hence the caller must check it. + * + * Return: zero if successful, or a negative error code + */ +static inline int __must_check +snd_pcm_set_fixed_buffer(struct snd_pcm_substream *substream, int type, + struct device *data, size_t size) +{ + return snd_pcm_set_managed_buffer(substream, type, data, size, 0); +} + +/** + * snd_pcm_set_fixed_buffer_all - Preallocate and set up the fixed size PCM buffer + * @pcm: the pcm instance + * @type: DMA type (SNDRV_DMA_TYPE_*) + * @data: DMA type dependent data + * @size: the requested pre-allocation size in bytes + * + * Apply the set up of the fixed buffer via snd_pcm_set_fixed_buffer() for + * all substream. If any of allocation fails, it returns -ENOMEM, hence the + * caller must check the return value. + * + * Return: zero if successful, or a negative error code + */ +static inline int __must_check +snd_pcm_set_fixed_buffer_all(struct snd_pcm *pcm, int type, + struct device *data, size_t size) +{ + return snd_pcm_set_managed_buffer_all(pcm, type, data, size, 0); +} + +int _snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream *substream, + size_t size, gfp_t gfp_flags); +int snd_pcm_lib_free_vmalloc_buffer(struct snd_pcm_substream *substream); +struct page *snd_pcm_lib_get_vmalloc_page(struct snd_pcm_substream *substream, + unsigned long offset); +/** + * snd_pcm_lib_alloc_vmalloc_buffer - allocate virtual DMA buffer + * @substream: the substream to allocate the buffer to + * @size: the requested buffer size, in bytes + * + * Allocates the PCM substream buffer using vmalloc(), i.e., the memory is + * contiguous in kernel virtual space, but not in physical memory. Use this + * if the buffer is accessed by kernel code but not by device DMA. + * + * Return: 1 if the buffer was changed, 0 if not changed, or a negative error + * code. + */ +static inline int snd_pcm_lib_alloc_vmalloc_buffer + (struct snd_pcm_substream *substream, size_t size) +{ + return _snd_pcm_lib_alloc_vmalloc_buffer(substream, size, + GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO); +} + +/** + * snd_pcm_lib_alloc_vmalloc_32_buffer - allocate 32-bit-addressable buffer + * @substream: the substream to allocate the buffer to + * @size: the requested buffer size, in bytes + * + * This function works like snd_pcm_lib_alloc_vmalloc_buffer(), but uses + * vmalloc_32(), i.e., the pages are allocated from 32-bit-addressable memory. + * + * Return: 1 if the buffer was changed, 0 if not changed, or a negative error + * code. + */ +static inline int snd_pcm_lib_alloc_vmalloc_32_buffer + (struct snd_pcm_substream *substream, size_t size) +{ + return _snd_pcm_lib_alloc_vmalloc_buffer(substream, size, + GFP_KERNEL | GFP_DMA32 | __GFP_ZERO); +} + +#define snd_pcm_get_dma_buf(substream) ((substream)->runtime->dma_buffer_p) + +/** + * snd_pcm_sgbuf_get_addr - Get the DMA address at the corresponding offset + * @substream: PCM substream + * @ofs: byte offset + * + * Return: DMA address + */ +static inline dma_addr_t +snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs) +{ + return snd_sgbuf_get_addr(snd_pcm_get_dma_buf(substream), ofs); +} + +/** + * snd_pcm_sgbuf_get_chunk_size - Compute the max size that fits within the + * contig. page from the given size + * @substream: PCM substream + * @ofs: byte offset + * @size: byte size to examine + * + * Return: chunk size + */ +static inline unsigned int +snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream, + unsigned int ofs, unsigned int size) +{ + return snd_sgbuf_get_chunk_size(snd_pcm_get_dma_buf(substream), ofs, size); +} + +/** + * snd_pcm_mmap_data_open - increase the mmap counter + * @area: VMA + * + * PCM mmap callback should handle this counter properly + */ +static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area) +{ + struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data; + atomic_inc(&substream->mmap_count); +} + +/** + * snd_pcm_mmap_data_close - decrease the mmap counter + * @area: VMA + * + * PCM mmap callback should handle this counter properly + */ +static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area) +{ + struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data; + atomic_dec(&substream->mmap_count); +} + +int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, + struct vm_area_struct *area); +/* mmap for io-memory area */ +#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) +#define SNDRV_PCM_INFO_MMAP_IOMEM SNDRV_PCM_INFO_MMAP +int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area); +#else +#define SNDRV_PCM_INFO_MMAP_IOMEM 0 +#define snd_pcm_lib_mmap_iomem NULL +#endif + +/** + * snd_pcm_limit_isa_dma_size - Get the max size fitting with ISA DMA transfer + * @dma: DMA number + * @max: pointer to store the max size + */ +static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max) +{ + *max = dma < 4 ? 64 * 1024 : 128 * 1024; +} + +/* + * Misc + */ + +#define SNDRV_PCM_DEFAULT_CON_SPDIF (IEC958_AES0_CON_EMPHASIS_NONE|\ + (IEC958_AES1_CON_ORIGINAL<<8)|\ + (IEC958_AES1_CON_PCM_CODER<<8)|\ + (IEC958_AES3_CON_FS_48000<<24)) + +const char *snd_pcm_format_name(snd_pcm_format_t format); + +/** + * snd_pcm_direction_name - Get a string naming the direction of a stream + * @direction: Stream's direction, one of SNDRV_PCM_STREAM_XXX + * + * Returns a string naming the direction of the stream. + */ +static inline const char *snd_pcm_direction_name(int direction) +{ + if (direction == SNDRV_PCM_STREAM_PLAYBACK) + return "Playback"; + else + return "Capture"; +} + +/** + * snd_pcm_stream_str - Get a string naming the direction of a stream + * @substream: the pcm substream instance + * + * Return: A string naming the direction of the stream. + */ +static inline const char *snd_pcm_stream_str(struct snd_pcm_substream *substream) +{ + return snd_pcm_direction_name(substream->stream); +} + +/* + * PCM channel-mapping control API + */ +/* array element of channel maps */ +struct snd_pcm_chmap_elem { + unsigned char channels; + unsigned char map[15]; +}; + +/* channel map information; retrieved via snd_kcontrol_chip() */ +struct snd_pcm_chmap { + struct snd_pcm *pcm; /* assigned PCM instance */ + int stream; /* PLAYBACK or CAPTURE */ + struct snd_kcontrol *kctl; + const struct snd_pcm_chmap_elem *chmap; + unsigned int max_channels; + unsigned int channel_mask; /* optional: active channels bitmask */ + void *private_data; /* optional: private data pointer */ +}; + +/** + * snd_pcm_chmap_substream - get the PCM substream assigned to the given chmap info + * @info: chmap information + * @idx: the substream number index + * + * Return: the matched PCM substream, or NULL if not found + */ +static inline struct snd_pcm_substream * +snd_pcm_chmap_substream(struct snd_pcm_chmap *info, unsigned int idx) +{ + struct snd_pcm_substream *s; + for (s = info->pcm->streams[info->stream].substream; s; s = s->next) + if (s->number == idx) + return s; + return NULL; +} + +/* ALSA-standard channel maps (RL/RR prior to C/LFE) */ +extern const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[]; +/* Other world's standard channel maps (C/LFE prior to RL/RR) */ +extern const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[]; + +/* bit masks to be passed to snd_pcm_chmap.channel_mask field */ +#define SND_PCM_CHMAP_MASK_24 ((1U << 2) | (1U << 4)) +#define SND_PCM_CHMAP_MASK_246 (SND_PCM_CHMAP_MASK_24 | (1U << 6)) +#define SND_PCM_CHMAP_MASK_2468 (SND_PCM_CHMAP_MASK_246 | (1U << 8)) + +int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream, + const struct snd_pcm_chmap_elem *chmap, + int max_channels, + unsigned long private_value, + struct snd_pcm_chmap **info_ret); + +/** + * pcm_format_to_bits - Strong-typed conversion of pcm_format to bitwise + * @pcm_format: PCM format + * + * Return: 64bit mask corresponding to the given PCM format + */ +static inline u64 pcm_format_to_bits(snd_pcm_format_t pcm_format) +{ + return 1ULL << (__force int) pcm_format; +} + +/** + * pcm_for_each_format - helper to iterate for each format type + * @f: the iterator variable in snd_pcm_format_t type + */ +#define pcm_for_each_format(f) \ + for ((f) = SNDRV_PCM_FORMAT_FIRST; \ + (__force int)(f) <= (__force int)SNDRV_PCM_FORMAT_LAST; \ + (f) = (__force snd_pcm_format_t)((__force int)(f) + 1)) + +/* printk helpers */ +#define pcm_err(pcm, fmt, args...) \ + dev_err((pcm)->card->dev, fmt, ##args) +#define pcm_warn(pcm, fmt, args...) \ + dev_warn((pcm)->card->dev, fmt, ##args) +#define pcm_dbg(pcm, fmt, args...) \ + dev_dbg((pcm)->card->dev, fmt, ##args) + +struct snd_pcm_status64 { + snd_pcm_state_t state; /* stream state */ + u8 rsvd[4]; + s64 trigger_tstamp_sec; /* time when stream was started/stopped/paused */ + s64 trigger_tstamp_nsec; + s64 tstamp_sec; /* reference timestamp */ + s64 tstamp_nsec; + snd_pcm_uframes_t appl_ptr; /* appl ptr */ + snd_pcm_uframes_t hw_ptr; /* hw ptr */ + snd_pcm_sframes_t delay; /* current delay in frames */ + snd_pcm_uframes_t avail; /* number of frames available */ + snd_pcm_uframes_t avail_max; /* max frames available on hw since last status */ + snd_pcm_uframes_t overrange; /* count of ADC (capture) overrange detections from last status */ + snd_pcm_state_t suspended_state; /* suspended stream state */ + __u32 audio_tstamp_data; /* needed for 64-bit alignment, used for configs/report to/from userspace */ + s64 audio_tstamp_sec; /* sample counter, wall clock, PHC or on-demand sync'ed */ + s64 audio_tstamp_nsec; + s64 driver_tstamp_sec; /* useful in case reference system tstamp is reported with delay */ + s64 driver_tstamp_nsec; + __u32 audio_tstamp_accuracy; /* in ns units, only valid if indicated in audio_tstamp_data */ + unsigned char reserved[52-4*sizeof(s64)]; /* must be filled with zero */ +}; + +#define SNDRV_PCM_IOCTL_STATUS64 _IOR('A', 0x20, struct snd_pcm_status64) +#define SNDRV_PCM_IOCTL_STATUS_EXT64 _IOWR('A', 0x24, struct snd_pcm_status64) + +struct snd_pcm_status32 { + snd_pcm_state_t state; /* stream state */ + s32 trigger_tstamp_sec; /* time when stream was started/stopped/paused */ + s32 trigger_tstamp_nsec; + s32 tstamp_sec; /* reference timestamp */ + s32 tstamp_nsec; + u32 appl_ptr; /* appl ptr */ + u32 hw_ptr; /* hw ptr */ + s32 delay; /* current delay in frames */ + u32 avail; /* number of frames available */ + u32 avail_max; /* max frames available on hw since last status */ + u32 overrange; /* count of ADC (capture) overrange detections from last status */ + snd_pcm_state_t suspended_state; /* suspended stream state */ + u32 audio_tstamp_data; /* needed for 64-bit alignment, used for configs/report to/from userspace */ + s32 audio_tstamp_sec; /* sample counter, wall clock, PHC or on-demand sync'ed */ + s32 audio_tstamp_nsec; + s32 driver_tstamp_sec; /* useful in case reference system tstamp is reported with delay */ + s32 driver_tstamp_nsec; + u32 audio_tstamp_accuracy; /* in ns units, only valid if indicated in audio_tstamp_data */ + unsigned char reserved[52-4*sizeof(s32)]; /* must be filled with zero */ +}; + +#define SNDRV_PCM_IOCTL_STATUS32 _IOR('A', 0x20, struct snd_pcm_status32) +#define SNDRV_PCM_IOCTL_STATUS_EXT32 _IOWR('A', 0x24, struct snd_pcm_status32) + +#endif /* __SOUND_PCM_H */ |