/* 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 <[email protected]> * Abramo Bagnara <[email protected]> */ #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> #include <linux/uio.h> #define snd_pcm_substream_chip(substream) … #define snd_pcm_chip(pcm) … #if IS_ENABLED(CONFIG_SND_PCM_OSS) #include <sound/pcm_oss.h> #endif /* * Hardware (lowlevel) section */ struct snd_pcm_hardware { … }; 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 { … }; /* * */ #if defined(CONFIG_SND_DYNAMIC_MINORS) #define SNDRV_PCM_DEVICES … #else #define SNDRV_PCM_DEVICES … #endif #define SNDRV_PCM_IOCTL1_RESET … /* 1 is absent slot. */ #define SNDRV_PCM_IOCTL1_CHANNEL_INFO … /* 3 is absent slot. */ #define SNDRV_PCM_IOCTL1_FIFO_SIZE … #define SNDRV_PCM_IOCTL1_SYNC_ID … #define SNDRV_PCM_TRIGGER_STOP … #define SNDRV_PCM_TRIGGER_START … #define SNDRV_PCM_TRIGGER_PAUSE_PUSH … #define SNDRV_PCM_TRIGGER_PAUSE_RELEASE … #define SNDRV_PCM_TRIGGER_SUSPEND … #define SNDRV_PCM_TRIGGER_RESUME … #define SNDRV_PCM_TRIGGER_DRAIN … #define SNDRV_PCM_POS_XRUN … /* If you change this don't forget to change rates[] table in pcm_native.c */ #define SNDRV_PCM_RATE_5512 … #define SNDRV_PCM_RATE_8000 … #define SNDRV_PCM_RATE_11025 … #define SNDRV_PCM_RATE_16000 … #define SNDRV_PCM_RATE_22050 … #define SNDRV_PCM_RATE_32000 … #define SNDRV_PCM_RATE_44100 … #define SNDRV_PCM_RATE_48000 … #define SNDRV_PCM_RATE_64000 … #define SNDRV_PCM_RATE_88200 … #define SNDRV_PCM_RATE_96000 … #define SNDRV_PCM_RATE_176400 … #define SNDRV_PCM_RATE_192000 … #define SNDRV_PCM_RATE_352800 … #define SNDRV_PCM_RATE_384000 … #define SNDRV_PCM_RATE_705600 … #define SNDRV_PCM_RATE_768000 … #define SNDRV_PCM_RATE_CONTINUOUS … #define SNDRV_PCM_RATE_KNOT … #define SNDRV_PCM_RATE_8000_44100 … #define SNDRV_PCM_RATE_8000_48000 … #define SNDRV_PCM_RATE_8000_96000 … #define SNDRV_PCM_RATE_8000_192000 … #define SNDRV_PCM_RATE_8000_384000 … #define SNDRV_PCM_RATE_8000_768000 … #define _SNDRV_PCM_FMTBIT(fmt) … #define SNDRV_PCM_FMTBIT_S8 … #define SNDRV_PCM_FMTBIT_U8 … #define SNDRV_PCM_FMTBIT_S16_LE … #define SNDRV_PCM_FMTBIT_S16_BE … #define SNDRV_PCM_FMTBIT_U16_LE … #define SNDRV_PCM_FMTBIT_U16_BE … #define SNDRV_PCM_FMTBIT_S24_LE … #define SNDRV_PCM_FMTBIT_S24_BE … #define SNDRV_PCM_FMTBIT_U24_LE … #define 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 … #define SNDRV_PCM_FMTBIT_S32_BE … #define SNDRV_PCM_FMTBIT_U32_LE … #define SNDRV_PCM_FMTBIT_U32_BE … #define SNDRV_PCM_FMTBIT_FLOAT_LE … #define SNDRV_PCM_FMTBIT_FLOAT_BE … #define SNDRV_PCM_FMTBIT_FLOAT64_LE … #define SNDRV_PCM_FMTBIT_FLOAT64_BE … #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE … #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE … #define SNDRV_PCM_FMTBIT_MU_LAW … #define SNDRV_PCM_FMTBIT_A_LAW … #define SNDRV_PCM_FMTBIT_IMA_ADPCM … #define SNDRV_PCM_FMTBIT_MPEG … #define SNDRV_PCM_FMTBIT_GSM … #define SNDRV_PCM_FMTBIT_S20_LE … #define SNDRV_PCM_FMTBIT_U20_LE … #define SNDRV_PCM_FMTBIT_S20_BE … #define SNDRV_PCM_FMTBIT_U20_BE … #define SNDRV_PCM_FMTBIT_SPECIAL … #define SNDRV_PCM_FMTBIT_S24_3LE … #define SNDRV_PCM_FMTBIT_U24_3LE … #define SNDRV_PCM_FMTBIT_S24_3BE … #define SNDRV_PCM_FMTBIT_U24_3BE … #define SNDRV_PCM_FMTBIT_S20_3LE … #define SNDRV_PCM_FMTBIT_U20_3LE … #define SNDRV_PCM_FMTBIT_S20_3BE … #define SNDRV_PCM_FMTBIT_U20_3BE … #define SNDRV_PCM_FMTBIT_S18_3LE … #define SNDRV_PCM_FMTBIT_U18_3LE … #define SNDRV_PCM_FMTBIT_S18_3BE … #define SNDRV_PCM_FMTBIT_U18_3BE … #define SNDRV_PCM_FMTBIT_G723_24 … #define SNDRV_PCM_FMTBIT_G723_24_1B … #define SNDRV_PCM_FMTBIT_G723_40 … #define SNDRV_PCM_FMTBIT_G723_40_1B … #define SNDRV_PCM_FMTBIT_DSD_U8 … #define SNDRV_PCM_FMTBIT_DSD_U16_LE … #define SNDRV_PCM_FMTBIT_DSD_U32_LE … #define SNDRV_PCM_FMTBIT_DSD_U16_BE … #define SNDRV_PCM_FMTBIT_DSD_U32_BE … #ifdef SNDRV_LITTLE_ENDIAN #define SNDRV_PCM_FMTBIT_S16 … #define SNDRV_PCM_FMTBIT_U16 … #define SNDRV_PCM_FMTBIT_S24 … #define SNDRV_PCM_FMTBIT_U24 … #define SNDRV_PCM_FMTBIT_S32 … #define SNDRV_PCM_FMTBIT_U32 … #define SNDRV_PCM_FMTBIT_FLOAT … #define SNDRV_PCM_FMTBIT_FLOAT64 … #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME … #define SNDRV_PCM_FMTBIT_S20 … #define SNDRV_PCM_FMTBIT_U20 … #endif #ifdef SNDRV_BIG_ENDIAN #define SNDRV_PCM_FMTBIT_S16 … #define SNDRV_PCM_FMTBIT_U16 … #define SNDRV_PCM_FMTBIT_S24 … #define SNDRV_PCM_FMTBIT_U24 … #define SNDRV_PCM_FMTBIT_S32 … #define SNDRV_PCM_FMTBIT_U32 … #define SNDRV_PCM_FMTBIT_FLOAT … #define SNDRV_PCM_FMTBIT_FLOAT64 … #define SNDRV_PCM_FMTBIT_IEC958_SUBFRAME … #define SNDRV_PCM_FMTBIT_S20 … #define SNDRV_PCM_FMTBIT_U20 … #endif #define _SNDRV_PCM_SUBFMTBIT(fmt) … #define SNDRV_PCM_SUBFMTBIT_STD … #define SNDRV_PCM_SUBFMTBIT_MSBITS_MAX … #define SNDRV_PCM_SUBFMTBIT_MSBITS_20 … #define SNDRV_PCM_SUBFMTBIT_MSBITS_24 … struct snd_pcm_file { … }; struct snd_pcm_hw_rule; snd_pcm_hw_rule_func_t; struct snd_pcm_hw_rule { … }; struct snd_pcm_hw_constraints { … }; static inline struct snd_mask *constrs_mask(struct snd_pcm_hw_constraints *constrs, snd_pcm_hw_param_t var) { … } static inline struct snd_interval *constrs_interval(struct snd_pcm_hw_constraints *constrs, snd_pcm_hw_param_t var) { … } struct snd_ratnum { … }; struct snd_ratden { … }; struct snd_pcm_hw_constraint_ratnums { … }; struct snd_pcm_hw_constraint_ratdens { … }; struct snd_pcm_hw_constraint_list { … }; struct snd_pcm_hw_constraint_ranges { … }; /* * 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 { … }; static inline void snd_pcm_unpack_audio_tstamp_config(__u32 data, struct snd_pcm_audio_tstamp_config *config) { … } /* * 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 { … }; static inline void snd_pcm_pack_audio_tstamp_report(__u32 *data, __u32 *accuracy, const struct snd_pcm_audio_tstamp_report *report) { … } struct snd_pcm_runtime { … }; struct snd_pcm_group { … }; struct pid; struct snd_pcm_substream { … }; #define SUBSTREAM_BUSY(substream) … struct snd_pcm_str { … }; struct snd_pcm { … }; /* * 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 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) { … } 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) … 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) … /* definitions for guard(); use like guard(pcm_stream_lock) */ DEFINE_LOCK_GUARD_1(pcm_stream_lock, struct snd_pcm_substream, snd_pcm_stream_lock(_T->lock), snd_pcm_stream_unlock(_T->lock)) DEFINE_LOCK_GUARD_1(pcm_stream_lock_irq, struct snd_pcm_substream, snd_pcm_stream_lock_irq(_T->lock), snd_pcm_stream_unlock_irq(_T->lock)) DEFINE_LOCK_GUARD_1(pcm_stream_lock_irqsave, struct snd_pcm_substream, snd_pcm_stream_lock_irqsave(_T->lock, _T->flags), snd_pcm_stream_unlock_irqrestore(_T->lock, _T->flags), … } /** * 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) … #define for_each_pcm_streams(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) { … } /** * __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) { … } /** * 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) { … } /** * 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) { … } /** * 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) { … } /** * 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) { … } /** * 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) { … } /** * 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) { … } /** * 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) { … } /** * 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_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_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) { … } /** * 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) { … } /** * 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) { … } /** * 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) { … } /** * 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) { … } /** * 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) { … } /** * 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) { … } /** * 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) { … } static inline int hw_is_mask(int var) { … } static inline int hw_is_interval(int var) { … } static inline struct snd_mask *hw_param_mask(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var) { … } static inline struct snd_interval *hw_param_interval(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var) { … } static inline const struct snd_mask *hw_param_mask_c(const struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var) { … } static inline const struct snd_interval *hw_param_interval_c(const struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var) { … } /** * 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) { … } /** * 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) { … } /** * 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) { … } /** * 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) { … } /** * 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) { … } /** * 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) { … } 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) { … } 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) … #else #define snd_pcm_format_cpu_endian … #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_per_card(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, const unsigned char *id, unsigned int len); /** * snd_pcm_set_sync - set the PCM sync id * @substream: the pcm substream * * Use the default PCM sync identifier for the specific card. */ static inline 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) { … } static inline snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, void __user *buf, snd_pcm_uframes_t frames) { … } static inline snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream, void __user **bufs, snd_pcm_uframes_t frames) { … } static inline snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream, void __user **bufs, snd_pcm_uframes_t frames) { … } static inline snd_pcm_sframes_t snd_pcm_kernel_write(struct snd_pcm_substream *substream, const void *buf, snd_pcm_uframes_t frames) { … } static inline snd_pcm_sframes_t snd_pcm_kernel_read(struct snd_pcm_substream *substream, void *buf, snd_pcm_uframes_t frames) { … } static inline snd_pcm_sframes_t snd_pcm_kernel_writev(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames) { … } static inline snd_pcm_sframes_t snd_pcm_kernel_readv(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames) { … } int snd_pcm_hw_limit_rates(struct snd_pcm_hardware *hw); static inline int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime) { … } 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) { … } /** * 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) { … } /* * 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) { … } /** * 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) { … } 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) { … } /** * 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) { … } #define snd_pcm_get_dma_buf(substream) … /** * 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) { … } /** * 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) { … } /** * 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) { … } /** * 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) { … } 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 … int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area); #else #define SNDRV_PCM_INFO_MMAP_IOMEM … #define snd_pcm_lib_mmap_iomem … #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) { … } /* * Misc */ #define SNDRV_PCM_DEFAULT_CON_SPDIF … 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) { … } /** * 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) { … } /* * PCM channel-mapping control API */ /* array element of channel maps */ struct snd_pcm_chmap_elem { … }; /* channel map information; retrieved via snd_kcontrol_chip() */ struct snd_pcm_chmap { … }; /** * 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) { … } /* 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 … #define SND_PCM_CHMAP_MASK_246 … #define SND_PCM_CHMAP_MASK_2468 … 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) { … } /** * 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) … /* printk helpers */ #define pcm_err(pcm, fmt, args...) … #define pcm_warn(pcm, fmt, args...) … #define pcm_dbg(pcm, fmt, args...) … /* helpers for copying between iov_iter and iomem */ int copy_to_iter_fromio(struct iov_iter *itert, const void __iomem *src, size_t count); int copy_from_iter_toio(void __iomem *dst, struct iov_iter *iter, size_t count); struct snd_pcm_status64 { … }; #define SNDRV_PCM_IOCTL_STATUS64 … #define SNDRV_PCM_IOCTL_STATUS_EXT64 … struct snd_pcm_status32 { … }; #define SNDRV_PCM_IOCTL_STATUS32 … #define SNDRV_PCM_IOCTL_STATUS_EXT32 … #endif /* __SOUND_PCM_H */
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