> Date: Wed, 24 Apr 2013 15:39:42 +0200 > From: Tobias Boege <tobias@xxxxxxxxxxxxxx> > > On Wed, 24 Apr 2013, Matt Davis wrote: >> Hello, >> I want my kernel module to dynamically add sysfs files for its >> corresponding device. Without going into detail, the attribute file >> will be named something like: /sys/class/myclass/mydev0/fileX where >> 'X' is an integer ranging from 1-256. I did not see anything in the >> api to allow this. I suppose I could just dynamically allocate an >> attribute, give it the unique name by tacking on my own integer, and >> pass that off to device_create_file(). However, I have not seen >> anywhere in the codebase where another module does this; I assume it >> is not allowed (or there is a better solution). >> >> The other solution (instead of sysfs) would be to add an ioctl, but >> this means the userland application must know the specific 'file' id >> to query. In the sysfs version above, the userland application can >> just grab the directory listing of /sys/class/myclaass/mydev0/ and see >> how many 'file' instances exist. >> >> -Matt > > Hmm, the following led some places on my system: > > $ shopt -s extglob > $ find /sys/!(module|kernel) -name "*[0-9]" > ... > /sys/firmware/acpi/interrupts/gpe00 > /sys/firmware/acpi/interrupts/gpe01 > /sys/firmware/acpi/interrupts/gpe02 > /sys/firmware/acpi/interrupts/gpe03 > /sys/firmware/acpi/interrupts/gpe04 > /sys/firmware/acpi/interrupts/gpe05 > ... > > >From a quick grep, the source _may_ be somewhere around > > drivers/acpi/sysfs.c: > 658 sprintf(buffer, "gpe%02X", i); > > Hope this helps you further. Tobi, That is exactly what I am looking for; that and the fact no one explicitly flamed me for my idea. -Matt _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
