原址
soc_probe
==> snd_soc_register_card或者snd_soc_register_dai或者snd_soc_register_platform或者snd_soc_register_codec
==> snd_soc_instantiate_cards
==> snd_soc_instantiate_card
==> codec_dev->probe
==> uda134x_soc_probe
==> snd_soc_new_pcms
==> soc_new_pcm
==> snd_pcm_new
snd_soc_new_pcms
snd_card_create
snd_ctl_create
snd_ctl_dev_register建立"controlc%i"音效卡對應的控制節點,
他的fops為snd_ctl_f_ops
snd_pcm_dev_register
snd_register_device_for_dev
建立"pcmc%id%ip"或者"pcmc%id%ic"裝置節點,它的fops為snd_pcm_f_ops[2]
snd_pcm_f_ops[2]
==> snd_pcm_playback_open或者snd_pcm_capture_open
==> snd_pcm_open或者oss的snd_pcm_oss_f_reg.snd_pcm_oss_open,這就對應/dev/dsp了
==> snd_pcm_open_file或者oss的snd_pcm_oss_open_file
==> snd_pcm_open_substream
==> soc_pcm_open
/* asoc pcm operations */
static struct snd_pcm_ops soc_pcm_ops = ;
==> soc_pcm_open
cpu_dai->ops->startup // 無
platform->pcm_ops->open // s3c_dma_open 分配dma空間
codec_dai->ops->startup // uda134x_startup
card_dai_link->ops->startup // s3c24xx_uda134x_startup 獲取clock時鐘源
// cpu_dai單元
struct snd_soc_dai s3c24xx_i2s_dai = ,
.capture = ,
.ops = &s3c24xx_i2s_dai_ops,
};//platform單元
struct snd_soc_platform s3c24xx_soc_platform = ;
static struct snd_pcm_ops s3c_dma_ops = ;
// codec_dai單元
struct snd_soc_dai uda134x_dai = ,
/* capture capabilities */
.capture = ,
/* pcm operations */
.ops = &uda134x_dai_ops,
};//card_dai_link單元
static struct snd_soc_dai_link s3c24xx_uda134x_dai_link = ;
pcm.c
snd_pcm_control_ioctl()
case sndrv_ctl_ioctl_pcm_info:
* s1:get params infofrom userspace arg*
* s2:get info->device
* s3:get info->stream
* s4:get info->subdevice
* s5:get pcm from matching special card and device
* s1:get pstrfrom &pcm->streams[stream]
* s2:get substreamfrom pstr->substream
* s3:now! we got struct snd_pcm_substream*substream
* which contents the struct snd_pcm_runtime*runtime;
snd_pcm_runtime裡面有
/* -- hardware description -- */
struct snd_pcm_hardware hw;
struct snd_pcm_hw_constraintshw_constraints;
xx_pcm.c
xx_pcm_hardware
xx_pcm_open()
xx_pcm_ops
xx_soc_platform
snd_soc_register_platform()
xx_soc_platform_init()
module_init
ALSA驅動 裝置函式呼叫關係
soc probe snd soc register card或者snd soc register dai或者snd soc register platform或者snd soc register codec snd soc instantiate cards snd soc instantiate...
ALSA驅動 裝置函式呼叫關係
soc probe snd soc register card或者snd soc register dai或者snd soc register platform或者snd soc register codec snd soc instantiate cards snd soc instantiate...
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