hi there,
I am writing a very generic alsa soc i2s driver for a very generic i2s
device.
The platform is an Exynos 5250 SoC board.
Having trouble was looking for some help ...
I have tried to start this driver in two ways. 1] Using the
module_init/module_exit method and 2] Using the module_platform_driver
approach.
I have implemented the following :
soc/codecs/implant.c
soc/samsung/implant.c
In both cases I have :
static struct snd_soc_ops implant_ops = {
.hw_params = implant_hw_params,
};
static struct snd_soc_dai_link implant_dai = {
.name = "implant",
.stream_name = "IMPLANT",
.cpu_dai_name = "samsung-i2s.0",
.codec_dai_name = "implant-pcm",
.platform_name = "samsung-i2s.0",
.codec_name = "implant.0-001a",
.ignore_suspend = 1,
.ops = &implant_ops,
};
I have setup the device tree as expected for sound@3830000
sound@3830000 {
samsung,codec-type = "implant";
};
1] Approach using module_init/module_exit
static struct snd_soc_card snd_soc_machine_implant = {
.name = "Implant",
.owner = THIS_MODULE,
.dai_link = &implant_dai,
.num_links = 1,
.dapm_widgets = widgets,
.num_dapm_widgets = ARRAY_SIZE(widgets),
.dapm_routes = audio_paths,
.num_dapm_routes = ARRAY_SIZE(audio_paths),
};
Here is the output of the kernel :
[ 1.802645] soc-audio soc-audio: ASoC: machine Implant should use
snd_soc_register_card()
[ 1.802656] soc-audio soc-audio: ASoC: CPU DAI samsung-i2s.0 not
registered
[ 1.802679] platform soc-audio: Driver soc-audio requests probe deferral
[ 2.271140] soc-audio: probe of soc-audio failed with error -22
Not sure why it fails.
The only thing I know is that my driver exits the init function
returning 0 (module_init(implant_init)).
This appears to be correct.
2] Approach using module_platform_driver
When I switch to using snd_soc_register_card with :
module_platform_driver(implant_driver);
static struct platform_driver implant_driver = {
.driver = {
.name = "implant",
.owner = THIS_MODULE,
},
.probe = implant_probe,
.remove = implant_remove,
};
I get the following from dmesg :
[ 1.802430] Error: Driver 'implant' is already registered, aborting...
However I don't see any of my printk statements from dmesg ...
Matt
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