增加sysfs接口

hc

2023-08-30 862c27fc9920c83318c784bfdadf43a65df1ec8f

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# locally computed
sha256  092c26c51166d1d1f025cd06742981783dea7e42bfe4f73f10c4418fc003de94  ympd-v1.2.3.tar.gz