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linux/include/sound/soc-component.h
Takashi Iwai ef98a48832 ASoC: Name iov_iter argument as iterator instead of buffer 
While transitioning ASoC code for iov_iter usages, I kept the argument
name as "buf" as the original code.  But, iov_iter is an iterator, and
using the name "buf" may be misleading: the crucial difference is that
iov_iter can be proceeded after the operation, hence it can't be
passed twice, while a simple "buffer" sounds as if reusable.

To make the usage clearer, rename the argument from "buf" to "iter".
There is no functional changes, just names.

Fixes: 66201cacc3 ("ASoC: component: Add generic PCM copy ops")
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/CAHk-=wje+VkXjjfVTmK-uJdG_M5=ar14QxAwK+XDiq07k_pzBg@mail.gmail.com
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230831130457.8180-2-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2023-09-01 15:38:49 +02:00

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/* SPDX-License-Identifier: GPL-2.0
*
* soc-component.h
*
* Copyright (C) 2019 Renesas Electronics Corp.
* Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
*/
#ifndef __SOC_COMPONENT_H
#define __SOC_COMPONENT_H
#include <sound/soc.h>
/*
* Component probe and remove ordering levels for components with runtime
* dependencies.
*/
#define SND_SOC_COMP_ORDER_FIRST -2
#define SND_SOC_COMP_ORDER_EARLY -1
#define SND_SOC_COMP_ORDER_NORMAL 0
#define SND_SOC_COMP_ORDER_LATE 1
#define SND_SOC_COMP_ORDER_LAST 2
#define for_each_comp_order(order) \
for (order = SND_SOC_COMP_ORDER_FIRST; \
order <= SND_SOC_COMP_ORDER_LAST; \
order++)
/* component interface */
struct snd_compress_ops {
int (*open)(struct snd_soc_component *component,
struct snd_compr_stream *stream);
int (*free)(struct snd_soc_component *component,
struct snd_compr_stream *stream);
int (*set_params)(struct snd_soc_component *component,
struct snd_compr_stream *stream,
struct snd_compr_params *params);
int (*get_params)(struct snd_soc_component *component,
struct snd_compr_stream *stream,
struct snd_codec *params);
int (*set_metadata)(struct snd_soc_component *component,
struct snd_compr_stream *stream,
struct snd_compr_metadata *metadata);
int (*get_metadata)(struct snd_soc_component *component,
struct snd_compr_stream *stream,
struct snd_compr_metadata *metadata);
int (*trigger)(struct snd_soc_component *component,
struct snd_compr_stream *stream, int cmd);
int (*pointer)(struct snd_soc_component *component,
struct snd_compr_stream *stream,
struct snd_compr_tstamp *tstamp);
int (*copy)(struct snd_soc_component *component,
struct snd_compr_stream *stream, char __user *buf,
size_t count);
int (*mmap)(struct snd_soc_component *component,
struct snd_compr_stream *stream,
struct vm_area_struct *vma);
int (*ack)(struct snd_soc_component *component,
struct snd_compr_stream *stream, size_t bytes);
int (*get_caps)(struct snd_soc_component *component,
struct snd_compr_stream *stream,
struct snd_compr_caps *caps);
int (*get_codec_caps)(struct snd_soc_component *component,
struct snd_compr_stream *stream,
struct snd_compr_codec_caps *codec);
};
struct snd_soc_component_driver {
const char *name;
/* Default control and setup, added after probe() is run */
const struct snd_kcontrol_new *controls;
unsigned int num_controls;
const struct snd_soc_dapm_widget *dapm_widgets;
unsigned int num_dapm_widgets;
const struct snd_soc_dapm_route *dapm_routes;
unsigned int num_dapm_routes;
int (*probe)(struct snd_soc_component *component);
void (*remove)(struct snd_soc_component *component);
int (*suspend)(struct snd_soc_component *component);
int (*resume)(struct snd_soc_component *component);
unsigned int (*read)(struct snd_soc_component *component,
unsigned int reg);
int (*write)(struct snd_soc_component *component,
unsigned int reg, unsigned int val);
/* pcm creation and destruction */
int (*pcm_construct)(struct snd_soc_component *component,
struct snd_soc_pcm_runtime *rtd);
void (*pcm_destruct)(struct snd_soc_component *component,
struct snd_pcm *pcm);
/* component wide operations */
int (*set_sysclk)(struct snd_soc_component *component,
int clk_id, int source, unsigned int freq, int dir);
int (*set_pll)(struct snd_soc_component *component, int pll_id,
int source, unsigned int freq_in, unsigned int freq_out);
int (*set_jack)(struct snd_soc_component *component,
struct snd_soc_jack *jack, void *data);
int (*get_jack_type)(struct snd_soc_component *component);
/* DT */
int (*of_xlate_dai_name)(struct snd_soc_component *component,
const struct of_phandle_args *args,
const char **dai_name);
int (*of_xlate_dai_id)(struct snd_soc_component *comment,
struct device_node *endpoint);
void (*seq_notifier)(struct snd_soc_component *component,
enum snd_soc_dapm_type type, int subseq);
int (*stream_event)(struct snd_soc_component *component, int event);
int (*set_bias_level)(struct snd_soc_component *component,
enum snd_soc_bias_level level);
int (*open)(struct snd_soc_component *component,
struct snd_pcm_substream *substream);
int (*close)(struct snd_soc_component *component,
struct snd_pcm_substream *substream);
int (*ioctl)(struct snd_soc_component *component,
struct snd_pcm_substream *substream,
unsigned int cmd, void *arg);
int (*hw_params)(struct snd_soc_component *component,
struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params);
int (*hw_free)(struct snd_soc_component *component,
struct snd_pcm_substream *substream);
int (*prepare)(struct snd_soc_component *component,
struct snd_pcm_substream *substream);
int (*trigger)(struct snd_soc_component *component,
struct snd_pcm_substream *substream, int cmd);
int (*sync_stop)(struct snd_soc_component *component,
struct snd_pcm_substream *substream);
snd_pcm_uframes_t (*pointer)(struct snd_soc_component *component,
struct snd_pcm_substream *substream);
int (*get_time_info)(struct snd_soc_component *component,
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 (*copy)(struct snd_soc_component *component,
struct snd_pcm_substream *substream, int channel,
unsigned long pos, struct iov_iter *iter,
unsigned long bytes);
struct page *(*page)(struct snd_soc_component *component,
struct snd_pcm_substream *substream,
unsigned long offset);
int (*mmap)(struct snd_soc_component *component,
struct snd_pcm_substream *substream,
struct vm_area_struct *vma);
int (*ack)(struct snd_soc_component *component,
struct snd_pcm_substream *substream);
snd_pcm_sframes_t (*delay)(struct snd_soc_component *component,
struct snd_pcm_substream *substream);
const struct snd_compress_ops *compress_ops;
/* probe ordering - for components with runtime dependencies */
int probe_order;
int remove_order;
/*
* soc_pcm_trigger() start/stop sequence.
* see also
* snd_soc_dai_link
* soc_pcm_trigger()
*/
enum snd_soc_trigger_order trigger_start;
enum snd_soc_trigger_order trigger_stop;
/*
* signal if the module handling the component should not be removed
* if a pcm is open. Setting this would prevent the module
* refcount being incremented in probe() but allow it be incremented
* when a pcm is opened and decremented when it is closed.
*/
unsigned int module_get_upon_open:1;
/* bits */
unsigned int idle_bias_on:1;
unsigned int suspend_bias_off:1;
unsigned int use_pmdown_time:1; /* care pmdown_time at stop */
/*
* Indicates that the component does not care about the endianness of
* PCM audio data and the core will ensure that both LE and BE variants
* of each used format are present. Typically this is because the
* component sits behind a bus that abstracts away the endian of the
* original data, ie. one for which the transmission endian is defined
* (I2S/SLIMbus/SoundWire), or the concept of endian doesn't exist (PDM,
* analogue).
*/
unsigned int endianness:1;
unsigned int legacy_dai_naming:1;
/* this component uses topology and ignore machine driver FEs */
const char *ignore_machine;
const char *topology_name_prefix;
int (*be_hw_params_fixup)(struct snd_soc_pcm_runtime *rtd,
struct snd_pcm_hw_params *params);
bool use_dai_pcm_id; /* use DAI link PCM ID as PCM device number */
int be_pcm_base; /* base device ID for all BE PCMs */
#ifdef CONFIG_DEBUG_FS
const char *debugfs_prefix;
#endif
};
struct snd_soc_component {
const char *name;
int id;
const char *name_prefix;
struct device *dev;
struct snd_soc_card *card;
unsigned int active;
unsigned int suspended:1; /* is in suspend PM state */
struct list_head list;
struct list_head card_aux_list; /* for auxiliary bound components */
struct list_head card_list;
const struct snd_soc_component_driver *driver;
struct list_head dai_list;
int num_dai;
struct regmap *regmap;
int val_bytes;
struct mutex io_mutex;
/* attached dynamic objects */
struct list_head dobj_list;
/*
* DO NOT use any of the fields below in drivers, they are temporary and
* are going to be removed again soon. If you use them in driver code
* the driver will be marked as BROKEN when these fields are removed.
*/
/* Don't use these, use snd_soc_component_get_dapm() */
struct snd_soc_dapm_context dapm;
/* machine specific init */
int (*init)(struct snd_soc_component *component);
/* function mark */
void *mark_module;
struct snd_pcm_substream *mark_open;
struct snd_pcm_substream *mark_hw_params;
struct snd_pcm_substream *mark_trigger;
struct snd_compr_stream *mark_compr_open;
void *mark_pm;
struct dentry *debugfs_root;
const char *debugfs_prefix;
};
#define for_each_component_dais(component, dai)\
list_for_each_entry(dai, &(component)->dai_list, list)
#define for_each_component_dais_safe(component, dai, _dai)\
list_for_each_entry_safe(dai, _dai, &(component)->dai_list, list)
/**
* snd_soc_dapm_to_component() - Casts a DAPM context to the component it is
* embedded in
* @dapm: The DAPM context to cast to the component
*
* This function must only be used on DAPM contexts that are known to be part of
* a component (e.g. in a component driver). Otherwise the behavior is
* undefined.
*/
static inline struct snd_soc_component *snd_soc_dapm_to_component(
struct snd_soc_dapm_context *dapm)
{
return container_of(dapm, struct snd_soc_component, dapm);
}
/**
* snd_soc_component_get_dapm() - Returns the DAPM context associated with a
* component
* @component: The component for which to get the DAPM context
*/
static inline struct snd_soc_dapm_context *snd_soc_component_get_dapm(
struct snd_soc_component *component)
{
return &component->dapm;
}
/**
* snd_soc_component_init_bias_level() - Initialize COMPONENT DAPM bias level
* @component: The COMPONENT for which to initialize the DAPM bias level
* @level: The DAPM level to initialize to
*
* Initializes the COMPONENT DAPM bias level. See snd_soc_dapm_init_bias_level()
*/
static inline void
snd_soc_component_init_bias_level(struct snd_soc_component *component,
enum snd_soc_bias_level level)
{
snd_soc_dapm_init_bias_level(
snd_soc_component_get_dapm(component), level);
}
/**
* snd_soc_component_get_bias_level() - Get current COMPONENT DAPM bias level
* @component: The COMPONENT for which to get the DAPM bias level
*
* Returns: The current DAPM bias level of the COMPONENT.
*/
static inline enum snd_soc_bias_level
snd_soc_component_get_bias_level(struct snd_soc_component *component)
{
return snd_soc_dapm_get_bias_level(
snd_soc_component_get_dapm(component));
}
/**
* snd_soc_component_force_bias_level() - Set the COMPONENT DAPM bias level
* @component: The COMPONENT for which to set the level
* @level: The level to set to
*
* Forces the COMPONENT bias level to a specific state. See
* snd_soc_dapm_force_bias_level().
*/
static inline int
snd_soc_component_force_bias_level(struct snd_soc_component *component,
enum snd_soc_bias_level level)
{
return snd_soc_dapm_force_bias_level(
snd_soc_component_get_dapm(component),
level);
}
/**
* snd_soc_dapm_kcontrol_component() - Returns the component associated to a
* kcontrol
* @kcontrol: The kcontrol
*
* This function must only be used on DAPM contexts that are known to be part of
* a COMPONENT (e.g. in a COMPONENT driver). Otherwise the behavior is undefined
*/
static inline struct snd_soc_component *snd_soc_dapm_kcontrol_component(
struct snd_kcontrol *kcontrol)
{
return snd_soc_dapm_to_component(snd_soc_dapm_kcontrol_dapm(kcontrol));
}
/**
* snd_soc_component_cache_sync() - Sync the register cache with the hardware
* @component: COMPONENT to sync
*
* Note: This function will call regcache_sync()
*/
static inline int snd_soc_component_cache_sync(
struct snd_soc_component *component)
{
return regcache_sync(component->regmap);
}
void snd_soc_component_set_aux(struct snd_soc_component *component,
struct snd_soc_aux_dev *aux);
int snd_soc_component_init(struct snd_soc_component *component);
int snd_soc_component_is_dummy(struct snd_soc_component *component);
/* component IO */
unsigned int snd_soc_component_read(struct snd_soc_component *component,
unsigned int reg);
int snd_soc_component_write(struct snd_soc_component *component,
unsigned int reg, unsigned int val);
int snd_soc_component_update_bits(struct snd_soc_component *component,
unsigned int reg, unsigned int mask,
unsigned int val);
int snd_soc_component_update_bits_async(struct snd_soc_component *component,
unsigned int reg, unsigned int mask,
unsigned int val);
void snd_soc_component_async_complete(struct snd_soc_component *component);
int snd_soc_component_test_bits(struct snd_soc_component *component,
unsigned int reg, unsigned int mask,
unsigned int value);
unsigned int snd_soc_component_read_field(struct snd_soc_component *component,
unsigned int reg, unsigned int mask);
int snd_soc_component_write_field(struct snd_soc_component *component,
unsigned int reg, unsigned int mask,
unsigned int val);
/* component wide operations */
int snd_soc_component_set_sysclk(struct snd_soc_component *component,
int clk_id, int source,
unsigned int freq, int dir);
int snd_soc_component_set_pll(struct snd_soc_component *component, int pll_id,
int source, unsigned int freq_in,
unsigned int freq_out);
int snd_soc_component_set_jack(struct snd_soc_component *component,
struct snd_soc_jack *jack, void *data);
int snd_soc_component_get_jack_type(struct snd_soc_component *component);
void snd_soc_component_seq_notifier(struct snd_soc_component *component,
enum snd_soc_dapm_type type, int subseq);
int snd_soc_component_stream_event(struct snd_soc_component *component,
int event);
int snd_soc_component_set_bias_level(struct snd_soc_component *component,
enum snd_soc_bias_level level);
void snd_soc_component_setup_regmap(struct snd_soc_component *component);
#ifdef CONFIG_REGMAP
void snd_soc_component_init_regmap(struct snd_soc_component *component,
struct regmap *regmap);
void snd_soc_component_exit_regmap(struct snd_soc_component *component);
#endif
#define snd_soc_component_module_get_when_probe(component)\
snd_soc_component_module_get(component, NULL, 0)
#define snd_soc_component_module_get_when_open(component, substream) \
snd_soc_component_module_get(component, substream, 1)
int snd_soc_component_module_get(struct snd_soc_component *component,
void *mark, int upon_open);
#define snd_soc_component_module_put_when_remove(component) \
snd_soc_component_module_put(component, NULL, 0, 0)
#define snd_soc_component_module_put_when_close(component, substream, rollback) \
snd_soc_component_module_put(component, substream, 1, rollback)
void snd_soc_component_module_put(struct snd_soc_component *component,
void *mark, int upon_open, int rollback);
static inline void snd_soc_component_set_drvdata(struct snd_soc_component *c,
void *data)
{
dev_set_drvdata(c->dev, data);
}
static inline void *snd_soc_component_get_drvdata(struct snd_soc_component *c)
{
return dev_get_drvdata(c->dev);
}
static inline unsigned int
snd_soc_component_active(struct snd_soc_component *component)
{
return component->active;
}
/* component pin */
int snd_soc_component_enable_pin(struct snd_soc_component *component,
const char *pin);
int snd_soc_component_enable_pin_unlocked(struct snd_soc_component *component,
const char *pin);
int snd_soc_component_disable_pin(struct snd_soc_component *component,
const char *pin);
int snd_soc_component_disable_pin_unlocked(struct snd_soc_component *component,
const char *pin);
int snd_soc_component_nc_pin(struct snd_soc_component *component,
const char *pin);
int snd_soc_component_nc_pin_unlocked(struct snd_soc_component *component,
const char *pin);
int snd_soc_component_get_pin_status(struct snd_soc_component *component,
const char *pin);
int snd_soc_component_force_enable_pin(struct snd_soc_component *component,
const char *pin);
int snd_soc_component_force_enable_pin_unlocked(
struct snd_soc_component *component,
const char *pin);
/* component controls */
int snd_soc_component_notify_control(struct snd_soc_component *component,
const char * const ctl);
/* component driver ops */
int snd_soc_component_open(struct snd_soc_component *component,
struct snd_pcm_substream *substream);
int snd_soc_component_close(struct snd_soc_component *component,
struct snd_pcm_substream *substream,
int rollback);
void snd_soc_component_suspend(struct snd_soc_component *component);
void snd_soc_component_resume(struct snd_soc_component *component);
int snd_soc_component_is_suspended(struct snd_soc_component *component);
int snd_soc_component_probe(struct snd_soc_component *component);
void snd_soc_component_remove(struct snd_soc_component *component);
int snd_soc_component_of_xlate_dai_id(struct snd_soc_component *component,
struct device_node *ep);
int snd_soc_component_of_xlate_dai_name(struct snd_soc_component *component,
const struct of_phandle_args *args,
const char **dai_name);
int snd_soc_component_compr_open(struct snd_soc_component *component,
struct snd_compr_stream *cstream);
void snd_soc_component_compr_free(struct snd_soc_component *component,
struct snd_compr_stream *cstream,
int rollback);
int snd_soc_component_compr_trigger(struct snd_compr_stream *cstream, int cmd);
int snd_soc_component_compr_set_params(struct snd_compr_stream *cstream,
struct snd_compr_params *params);
int snd_soc_component_compr_get_params(struct snd_compr_stream *cstream,
struct snd_codec *params);
int snd_soc_component_compr_get_caps(struct snd_compr_stream *cstream,
struct snd_compr_caps *caps);
int snd_soc_component_compr_get_codec_caps(struct snd_compr_stream *cstream,
struct snd_compr_codec_caps *codec);
int snd_soc_component_compr_ack(struct snd_compr_stream *cstream, size_t bytes);
int snd_soc_component_compr_pointer(struct snd_compr_stream *cstream,
struct snd_compr_tstamp *tstamp);
int snd_soc_component_compr_copy(struct snd_compr_stream *cstream,
char __user *buf, size_t count);
int snd_soc_component_compr_set_metadata(struct snd_compr_stream *cstream,
struct snd_compr_metadata *metadata);
int snd_soc_component_compr_get_metadata(struct snd_compr_stream *cstream,
struct snd_compr_metadata *metadata);
int snd_soc_pcm_component_pointer(struct snd_pcm_substream *substream);
int snd_soc_pcm_component_ioctl(struct snd_pcm_substream *substream,
unsigned int cmd, void *arg);
int snd_soc_pcm_component_sync_stop(struct snd_pcm_substream *substream);
int snd_soc_pcm_component_copy(struct snd_pcm_substream *substream,
int channel, unsigned long pos,
struct iov_iter *iter, unsigned long bytes);
struct page *snd_soc_pcm_component_page(struct snd_pcm_substream *substream,
unsigned long offset);
int snd_soc_pcm_component_mmap(struct snd_pcm_substream *substream,
struct vm_area_struct *vma);
int snd_soc_pcm_component_new(struct snd_soc_pcm_runtime *rtd);
void snd_soc_pcm_component_free(struct snd_soc_pcm_runtime *rtd);
int snd_soc_pcm_component_prepare(struct snd_pcm_substream *substream);
int snd_soc_pcm_component_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params);
void snd_soc_pcm_component_hw_free(struct snd_pcm_substream *substream,
int rollback);
int snd_soc_pcm_component_trigger(struct snd_pcm_substream *substream,
int cmd, int rollback);
int snd_soc_pcm_component_pm_runtime_get(struct snd_soc_pcm_runtime *rtd,
void *stream);
void snd_soc_pcm_component_pm_runtime_put(struct snd_soc_pcm_runtime *rtd,
void *stream, int rollback);
int snd_soc_pcm_component_ack(struct snd_pcm_substream *substream);
void snd_soc_pcm_component_delay(struct snd_pcm_substream *substream,
snd_pcm_sframes_t *cpu_delay, snd_pcm_sframes_t *codec_delay);
#endif /* __SOC_COMPONENT_H */
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