On a running Linux system, I want to know which device driver module created a particular sysfs entry. Is it possible to know? I know I can grep for relevant strings in the kernel source and try to identify. But, is there a way without doing that?
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1 Answers
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You can find which driver has created a sysfs entry by going through its source. If the driver uses device_create_file()/device_remove_file() in its init/exit sequences respectively then you can be sure a sysfs attribute file has been created by the driver. You can also find DEVICE_ATTR(_name, _mode, _show, _store) macro in the source to find out what functionality is provided by the sysfs file. Usually you can either cat the file or echo a string to it. A cat /sys/.../file, will correspond to the _show function and an echo /sys/.../file will correspond to the _store function mentioned in the macro.
