Android音频驱动-ASOC之常用对象

struct snd_soc_dai {    const char *name;    int id;    struct device *dev;    void *ac97_pdata;   /* platform_data for the ac97 codec */    /* driver ops */    struct snd_soc_dai_driver *driver;    /* DAI runtime info */    unsigned int capture_active:1;      /* stream is in use */    unsigned int playback_active:1;     /* stream is in use */    unsigned int symmetric_rates:1;    unsigned int symmetric_channels:1;    unsigned int symmetric_samplebits:1;    unsigned int active;    unsigned char probed:1;    struct snd_soc_dapm_widget *playback_widget;    struct snd_soc_dapm_widget *capture_widget;    /* DAI DMA data */    void *playback_dma_data;    void *capture_dma_data;    /* Symmetry data - only valid if symmetry is being enforced */    unsigned int rate;    unsigned int channels;    unsigned int sample_bits;    /* parent platform/codec */    struct snd_soc_platform *platform;    struct snd_soc_codec *codec;    struct snd_soc_component *component;    /* CODEC TDM slot masks and params (for fixup) */    unsigned int tx_mask;    unsigned int rx_mask;    struct snd_soc_card *card;    struct list_head list;};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 ignore_pmdown_time:1; /* pmdown_time is ignored at stop */    unsigned int registered_as_component:1;    unsigned int probed:1;    struct list_head list;    struct snd_soc_dai_driver *dai_drv;    int num_dai;    const struct snd_soc_component_driver *driver;    struct list_head dai_list;//保存codec dai链表对象    int (*read)(struct snd_soc_component *, unsigned int, unsigned int *);    int (*write)(struct snd_soc_component *, unsigned int, unsigned int);    struct regmap *regmap;    int val_bytes;    struct mutex io_mutex;    /*    * 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;    struct snd_soc_dapm_context *dapm_ptr;    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;    struct snd_soc_codec *codec;//属于哪个codec    int (*probe)(struct snd_soc_component *);    void (*remove)(struct snd_soc_component *);};struct snd_soc_codec {    struct device *dev;    const struct snd_soc_codec_driver *driver;    struct mutex mutex;    struct list_head list;    struct list_head card_list;    /* runtime */    struct snd_ac97 *ac97;  /* for ad-hoc ac97 devices */    unsigned int cache_bypass:1; /* Suppress access to the cache */    unsigned int suspended:1; /* Codec is in suspend PM state */    unsigned int ac97_registered:1; /* Codec has been AC97 registered */    unsigned int ac97_created:1; /* Codec has been created by SoC */    unsigned int cache_init:1; /* codec cache has been initialized */    u32 cache_sync; /* Cache needs to be synced to hardware */    /* codec IO */    void *control_data; /* codec control (i2c/3wire) data */    hw_write_t hw_write;    void *reg_cache;    struct mutex cache_rw_mutex;    /* component */    struct snd_soc_component component;//保存component对象    /* dapm */    struct snd_soc_dapm_context dapm;};