有platform driver,必定会有相应的platform device,这个platform device的来源后面再说,显然,platform driver注册后,probe回调将会被调用,这里是wm8994_probe函数: static int __devinit wm8994_probe(struct platform_device *pdev) { return snd_soc_register_codec(&pdev->dev, &soc_codec_dev_wm8994, wm8994_...
浅析ASoC-audio驱动oss框架下_dev_dsp与alsa框架下设备节点打开和创建简易流程 -
我试着运行这段代码,看看是否一切正常,但它返回了一个错误。import pygame.midi pygame.midi.init() 它返回以下错误: ALSA lib conf.c:3558:(snd_config_hooks_call) Cannot openshared library libasound_module_conf_pulse.so (/usr/lib/alsa-lib/libasound_module_conf_pulse.so: libasound_modu 浏览65提问...
static int snd_card_init(struct snd_card *card, struct device *parent, int idx, const char *xid, struct module *module, size_t extra_size) { int err; #ifdef CONFIG_SND_DEBUG char name[8]; #endif /* 1、根据传入的参数赋值xid, idx, module, parent */ /* (1). 为 card->private...
t14g5-amd-micmuteled-fail-journal.log @perexgno output from FixedBootSequence from the script. I suspect it's the following error in log above: Sep 10 09:39:40 u-ThinkPad-T14-Gen-5 wireplumber[2848]: SPA handle 'api.alsa.acp.device' could not be loaded; is it installed?
err);gotofail_register; } 3、snd_card_new函数详解 用于创建并初始化一个声卡的结构体 /** * snd_card_new - create and initialize a soundcard structure * @parent: the parent device object * @idx: card index (address) [0 ... (SNDRV_CARDS-1)] ...
return wm8994_device_init(wm8994, i2c->irq); } 继续进入wm8994_device_init()函数,它首先为两个LDO添加mfd子设备: [html]view plaincopy /* Add the on-chip regulators first for bootstrapping */ ret=mfd_add_devices(wm8994->dev, -1, ...
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return wm8994_device_init(wm8994, i2c->irq); } 继续进入wm8994_device_init()函数,它首先为两个LDO添加mfd子设备: [html]view plaincopy? /* Add the on-chip regulators first for bootstrapping */ ret=mfd_add_devices(wm8994->dev, -1, ...
Machine:指某款机器,通过配置 dai_link 把 cpu_dai、codec_dai、modem_dai 各个音频接口给链结成一条条音频链路,然后注册 snd_soc_card。和上面两个不一样,Platform 和 CODEC 驱动一般是可以重用的,而 Machine 有它特定的硬件特性,几乎是不可重用的。所谓的硬件特性指:SoC Platform 与 Codec 的差异;DAIs 之间...